Hydrocarbon cleaning agent is an industrial cleaning agent.Previously, I simplyCrude distillationThe refined lamp oil is directly used as a cleaning agent, which has been gradually out of use due to its odor, ignitability and dryness.
Hydrocarbon cleaning agent has good environmental protection characteristics and cleaning ability, and gradually becomes an important type ofIndustrial cleaning agentone of.
Excellent detergent used widely in the cleaning industryCFC-113(Freon) and 1.1.1-Trichloroethane（ethane）Production, import and use have been completely prohibited.Chlorine based cleaning agents (trichloroethaneTrichloroethylene、dichloromethaneEtc.), water system cleaning agent andHydrocarbonSeries cleaning agent, etcsuccedaneumFor most users, because the chlorine containing cleaning agent can be used by slightly modifying the original equipment, it can be inferred that these users have changed to use chlorine containing cleaning agent for a period of time.
However, chlorine containing cleaning agents are toxic,environmental controlVery strict, and because ISO14000 series has limited requirements for chlorine containing cleaning agents, enterprises have started to use hydrocarbon based cleaning agents and water based cleaning agents in order to obtain ISO14000 certificates.And the equipment of water system cleaning agentInvestment costHigh, difficult to dry, cleaned productsRegular meetingsRust, spots, drainage problems, andChina's water resourcesLack of such problems, manufacturers have gradually begun to study their alternatives.
On the other hand, the use of non-aqueous cleaning agents needs to be considered separatelyflammabilityAnd incombustibility.The hydrocarbon system is flammable, and it is not easy to dry compared with the chlorine containing cleaning agent.However, these aspects have been gradually compensated on the cleaning equipment, thus predictingHydrocarbonSeries detergent will gradually become the mainstream of current alternative detergent.Therefore, this article focuses on hydrocarbon cleaning agents and equipment.
Type of cleaning agent
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The distillate solvents obtained by distilling crude oil include petroleum series, petroleum series hydrocarbons, hydrocarbon series, hydrocarbon (hydrocarbon), industrial gasoline and other terms, but their definitions are still unclear.As the name suggests, hydrocarbons are only compounds composed of two elements.Previously, I simplyCrude distillationThe refined lamp oil is directly used as a cleaning agent, which is gradually not used due to its odor, ignitability and dryness.
Most usedHydrocarbonSeries detergent is not crude oilSimple distillationExquisite products, but chemical synthesis products or products after advanced refining treatment.Hydrocarbon cleaning agent is good with low odor.Passing the distillate of lamp oilmolecular sieveExtraction and distillation adjust the boiling point.There are also single component substances.
Normal hydrocarbon:Saturated chain hydrocarbon with structural formula of CnH2n+2.RectilinearStabilityCompared with, isomeric hydrocarbon hasBranched chainIt has good safety and low odor.Most of them are synthetic.
ringalkane: structural formula is CnH2n saturationAlkane。carbonAtomic numberDifferent, there can be simple cyclic alkanes, withSide chainNaphthenic hydrocarbon, etc.StructurallySolubilityGood, but poor in stability and odor.GenerallyCrude distillationOr add nuclear water to the aromatic system.
Aromatic hydrocarbon: containingbenzene ring，SolubilityStrong, less used due to fear of toxicity.
With the continuous development of hydrocarbon cleaning agent market and the expansion of cleaning field, functional hydrocarbon cleaning agent shouldmarket demandHowever, it has launched a series ofDegreasingOn the basis of degreasing, it can be adjusted according to different cleaning needsstainCan be divided into the following categories:
Anti rust hydrocarbon cleaning agent: It can clean and rust, and can be used for cleaning iron parts, carbon steel and other rusty metals,Rust prevention periodUp to 15-90 days.
Remove flux type hydrocarbon cleaner: clean flux, oil stain, dust, etc. on electronic instruments, PCB circuit boards and other parts.
Carbon and ash removing hydrocarbon cleaning agent: clean the carbon and ash on the cylindrical pressing and stretching workpiece such as batteries and capacitorscarbon black, powdery, greasy dirt, etc.
Wax removing hydrocarbon cleaner: used to clean the wax on hardware, bathroom, watch electroplating, jewelry processing, lighting manufacturing and other workpiecesPolishing wax
The cleaning principle of non-aqueous cleaning agent is simply based on the solvent solubility.The degreasing mechanism based on the solubility of oil or oily pollution is:Similitude compatibilityprinciple.Hydrocarbons such as gasoline and lamp oil are easy to dissolveheavy oil, othersHydrocarbons, easy and similarHalohydrocarbon（carbon tetrachloride、TrichloroethaneEtc.)mutually dissolvable。Water energy andWater structurebe similarOHThe mutual solubility of compounds such as R-COOH (low fatty acid), R-OH (low alcohol) is also based on this.Solubility between heterogeneous liquids andsurface tension、interfacial tensionThere is close relationship.For example, benzeneNaphthenic hydrocarbonThere is little difference between the surface tension of isosolvent and that of tar and lubricating oil, and the interfacial tension between them is approximately miscible.As for the solubility of solvents to grease or oily dirt, the lower the temperature of solute separation, the lower the temperature of solute separation during the cooling process of solutions with different solvents at a certain temperaturesolubilityThe bigger.
KB value
KB valueIt refers to the painting and coating industryTianna waterThe value used for the solubility refers to the value from 120g standard kauri gum at 25 ℃-butanolRequired for precipitation of kauri gum in solutiondiluentThe higher the KB value, the better the solubility.The KB value was used as an indicator to determine the solvent solubility for cleaning, but the KB value refers to the solubility of resin, which has no direct relationship with the cleaning power, so it is difficult to use as a benchmark.
SP value: δ=(△ E/V) △ E: evaporation energy V:Molar volume
Substances with similar SP values have similar agglutination energy, so they are easy to dissolve each other.This phenomenon isSimilitude compatibilityRule of thumb.SP values of each substance are shown on another page.Generally, the SP value of hydrocarbon cleaning agent is 7~8, and this value is related toProcessing oilSP value (7~8) is consistent, so it is easy to dissolve and has high cleaning power.But it is far away from the SP value of resin, so it is not easy to erode these materials.At the same time, for resin containing dirt, the solubility of alcohols is poor, and the cleaning effect is not good.The SP value can be used as an indicator when selecting cleaning agent, but it is dangerous to judge only by the value, so the actual contaminated oil must be used as the cleaning performance test for evaluation.
Physical
In addition to solvent solubility, heat, stirringfriction, pressurization, decompression, grinding, ultrasonic and other physicsForceImpact.It is not only one of the factors that should be considered, but all the factors should be considered comprehensively to improve the cleaning effect.Table 2 is a summary of factors affecting cleaning power.
Physical force: heating... promotes the reaction of other cleaning factors, the physical change of dirt, and the physical property change of the cleaned object.Ultrasound... cavitation caused by ultrasoundaccelerationStrong peeling and dispersion caused by direct inflow.Stirring... In order to promote the mixing of the contact between the cleaned surface and the fresh cleaning solution, the dirt after homogenization (shaking, improving the cleaning effect, mechanically promoting the stripping of the dirt on the cleaned surface, dispersing the stripping rotation) is put into the cleaning solution to prevent the re adhesion of the cleaned surface.Decompression... It makes the depressurized liquid permeate to the tiny place, so as to expand and remove the dirt.According to the above factors affecting the cleaning force, hydrocarbonCleaning equipmentThe design and configuration should be targeted. For example, the configuration of the main function tank for cleaning is usually as follows: working principle: the first stage: the operator first puts the product to be cleaned into the washing basket, and then puts the washing basket into the equipmentFeedingZone, controlled by operatorMechanical armLift the washing basket to cleanMain slot。At this time, the cylinder drive slot cover automatically closesCleaning tank，Vacuum degassingThe system starts to exhaust the air in the tank. Under the vacuum state, the gas in the narrow gap of the product to be cleaned and the gas contained in the cleaning agent can be extracted. The ultrasonic wave starts and the swing device starts to drive the washing basket to rotate, so that the cleaning agent can be fully cleaned;When the set time is up, the vacuum will be released, the cylinder drive will open the cover, the mechanical arm will lift the basket out and enter the second tank for cleaning. As for the number of tanks needed for vacuum cleaning, it needs to be determined according to the oil stain, impurities and other substances on the product surface and the product output
Sequence cleaning engineering Cleaning method Cleaning medium Cleaning time Temperature filtration heating methodVacuum degassingremarks
1. Initial cleaning Ultrasonic immersion polishing+rotating carbonization water model can be adjusted for 3 – 30min Normal temperature – 100 ℃ Cleaning solution selected for root gear can be adjusted for cartridge filtrationHeat transfer oilHeating YesForced coolingyes
2 Fine cleaning Ultrasonic immersion polishing+rotating carbonized water model is another choice 3 – 30min can adjust the normal temperature – 100 ℃ The cleaning solution selected for root gear can certainly adjust the barrel type filtered heat transfer oil heating and forced cooling Yes
3. Rinsing, ultrasonic immersion, polishing+rotating carbonized water model, another 3-30min, which can adjust the normal temperature – 100 ℃, the cleaning solution selected for root gear can certainly adjust the barrel type filtered heat transfer oil, heating and forced cooling
4 5 Fluid cutting+vacuum drying High speed air knife+rotary vacuum drying High speed hot air for 3-30min can adjust RT-150 ℃ medium efficiency filtering electric heating exhaust
6 Recovery vacuumVacuum distillationReclaimed carbonized water model Alternative multi-stage distillation recovery ---------------------- Heat transfer oil heating-----
Cleaning agent characteristics
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characteristic
As mentioned earlier, hydrocarbon cleaning agents can be divided into normal hydrocarbon, isomeric hydrocarbonNaphthenic hydrocarbonandAromatic hydrocarbonEtc.Its characteristics are:
yesMetalworking oilWith strong cleaning power → due tosurface tensionSmall, the cleaning effect of the slit and pore is good.
For liquid crystal pollutants, especially biphenyl pollutantsMiscibilityOK.
Recently, a variety of detergents (water-soluble processing oil, login, flaks) with cleaning effect have been developed.
Non corrosive to metals.
It has little effect on resin → normal hydrocarbon, isomeric hydrocarbon and naphthenic hydrocarbon.
majorityHydrocarbonThe cleaning agent can be recycled after distillation, which is economical in use.
Precautions
The weakness of hydrocarbon system lies in the low ignition point. Pay attention to the explosion-proof of cleaning equipment and surrounding places.
Cleaning agent selection
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1. Cleaning power
As described in the principle of non water based cleaning agent, the cleaning power of non water based cleaning agent depends onSolubilization。Pollutant processing oil ismineral oilThere are also insoluble substances.Whether the selected detergent can dissolve the dirt needs to be tested in advance, so as to select the detergent with good solubility.
2. Cleaning conditions
If the same cleaning agent is used to clean the same dirt, different cleaning effects will be obtained if the cleaning conditions (temperature, time, physical force, etc.) are different.The higher the temperature, the longer the timeOr plusUltrasonic and other physical forces, the better the cleaning effect.The test must be carried out under the same or more strict conditions as the actual use of the cleaning machine.
lotionAfter failure, the liquid will be replaced, and the waste liquid will become waste.Hydrocarbon cleaning agent can be burned and discarded due to its combustibility, and may be reused as fuel.However, chlorine containing cleaning agents cannot be disposed by themselves, and special waste disposal companies need to be entrusted, which will increase costs.Therefore, it is necessary to select a cleaning solution that is easy to handle to reduce costs.
2. Reduce the amount of processing oil in the adhesive cleaner.
The method of adhering cleaning dose mainly depends on the shape of the product, surface roughness and the nature of the cleaning agent（surface tension, film thickness, etc.
The methods to reduce the amount of processing oil in the adhesive cleaning agent are to set up wetting tanks, increase the number of wetting tanks, clean the equipment, use new cleaning fluid for final cleaning, and control the concentration of processing oil in the wetting tank below a certain amount by the equipment distillation regenerator.Liquid management measures.
2. Distillation regeneration method
Introduce the previously mentioned distillation regeneration.Detergent can be caused by dirt (processing oil, greaseAntirust oil, wax, liquid crystal, etc.The distillation and regeneration unit uses the property that the boiling point of liquid decreases with the decrease of pressureVacuum distillationOnly the cleaning agent in the cleaning solution is recycled and the processing oil is used asWaste liquid treatmentMethod.
FilterTo remove impurities such as metal powder in solvent, usepreheaterHeat the solvent to vaporize it, and remove the impurity through the separation tank.The regenerated solvent is liquefied by condensate gas and temporarily stays atSolvent recoveryReturn to the cleaning tank after the tank.
GeneralOperating conditionsThe pressure is 50~100Torr, the temperature is 90~120 ℃, and the purity of the recovered product should be improvedrate of recoveryThe above conditions can be changed according to the properties of cleaning fluid and processing oil.Generally, if the purity of the recovered product is increased, the recovery rate will be reduced. If the recovery rate is high, the purity will be low.
The appropriate distillation regenerator shall be selected according to the requirements of the cleaning tank, the amount of processing oil mixed, the type of processing oil, cleaning performance, etc.
Generally, what is discharged as waste liquid is the amount of mixed processing oil+α, so it is necessary to select a regenerator suitable for treating a large amount of processing oil cleaning liquid.
Also note that if the cleaning effect cannot be guaranteed.The distiller that can handle the liquid in the cleaning tank once a day is generally selected.For example, the total amount of liquid in the cleaning tank+wetting tank is 360L,working hours8 h/day, the theoretical cleaning frequency of the liquid in the 30 L/h distiller cleaning tank can reach 0.7 times/day.If the recovery rate of the distiller is 95% at this time, then 30L/h × 0.05 × 8h=12L/day, that is, the amount of waste liquid discharged every day is 12L. If the distiller works on the 25th day of every month, 300L of cleaning liquid needs to be supplemented.rate of recoveryWhen it is 98%, 30L/h × 0.02 × 8h=4.8L/day, the same as working on the 25th day of each month, 12L of detergent shall be supplemented.3% recovery, lossMagnitude difference2.5 times, so it is necessary to carefully study the difference of waste liquid volume (or replenished liquid volume).
The boiling point of chlorine and fluorine containing cleaning agents is lower than that of hydrocarbon systemsVacuum distillationsendSolvent regenerationIt is better to introduce steam cleaning equipment for regeneration and cleaning.At this time, it is important to manage how much processing oil is mixed in the cleaning fluid in the cleaning tank.In addition to the price of detergent, it is also necessary to study therate of recovery, purity, etc., which shall be determined after considering the total cost.
It is welded from SUS304L stainless steel plate with a thickness of 5mm, and the effective size of the tank (L × W × H) is Ф 500 × 1200mm.It is equipped with a viewing window and other observation structures to facilitate controllable operation. The vacuum tank bottom is equipped withWaste oilWaste residue dischargePipe, external cooling tank and waste oil collection tank
Heating: indirect heating with heat transfer oil.A heating device is attached to the lower part of the tankOil pocket, a heat transfer oil is placed externallyHeating box, heating power is 12kW.First byHeating tubeHeat the heat transfer oil, and then pass thepumpingThe heating oil is sent to the heating oil package, and then sent back to the heating box for heating after heat exchange, and so on.The heating oil is packed with independentTemperature control system, oil temperature RT. ～ 140 ℃ adjustable
The cleaning agent to be recovered is pumped invacuum distillationThe recovery tank, before entering the vacuum recovery tank, first enters a heat exchange cylinder, where it conducts heat exchange with the distilled HC steam pipe.afterVacuumizeAfter that, the detergent quickly boils and evaporates to generate HC steam, which can then be carried out in the condensation areaCondensation recovery, the recovered pure detergent is discharged into the liquid storage tank for recycling, with automaticfluid infusionCirculation and rinsing functions.
2. Strong vacuum decompression system
Equipped with vacuum reducing pump and vacuum display meter.Equipped with vacuum motor, equipped withSolenoid valve。vacuum distillationThe recovery capacity is 200L/H, under normal temperature and pressure,CarbohydratesThe boiling point of is 172 ℃. Under reduced pressure, the boiling point can be reduced. High temperature carbonized water can quickly form HC steam under reduced pressureVacuum pumpDraw out the recovery tank together, form liquid again in the cooling boxActivated carbon filtration, calledRegeneration liquid, can be recycled.
Equipped with 10HPcooling-water machine, TaikangcompressorHead, continuous supply for vacuum reclaimercooling waterAnd some cold water is supplied to two liquid storage tanks to prevent the cleaning agent from heating up.
Waste liquid treatment system:vacuum distillationThe high temperature residue and waste oil left after recovery are opened by the valve, and the waste liquid enters a cooling tank where it passes through the cold water coil for heat exchange. After cooling the high temperature waste oil, it is collected in the waste oil tank for centralized treatment.
Condensation system. Vacuum recovery is equipped with a cooling box to cool high temperature HC steam to form liquid;A cooling box is required in the waste oil treatment system to cool the high-temperature waste oil for centralized treatment.For this purpose, a set of refrigeration unit (consisting of a 10HP water chiller) is provided for the equipmentCold source。
4. Liquid Replenishment System
During normal operation, the cleaning solution of the distillation recovery tank can meet the working requirements of the day. If the liquid level is too low, the float type liquid level control will be triggeredThe micro switch, signal and cut off the heating power supply of the tank,BuzzerAn alarm will be given to indicate that the cleaning fluid is insufficient and that external fluid addition is required.
During regeneration, the liquid in the distillation recovery tank shall be basically distilled dry, and the regenerated cleaning liquid shall be stored in the liquid storage tank. If the cleaning liquid in the liquid storage tank is insufficient, the operator needs to insert the pipe with special interface (provided by the manufacturer) into the liquid storage tank (the liquid storage tank is the tank provided by the supplier when purchasing cleaning agent), tighten the interface, and open the compressionair switch, compressed air from the reservoirAir inletPress in, press the cleaning agent from the liquid outlet to the liquid storage tank until the liquid level in the liquid storage tank reaches a high level,BuzzerAn alarm is given, and the operator turns off the compressed air and ends the fluid infusion
Fire prevention countermeasures
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1. Elements of combustion
It is known that the biggest disadvantage of hydrocarbon cleaning agents is their flammability.Even if it is essentialunchanged。Therefore, it is necessary to establish corresponding countermeasures against fire and explosion.
The safety countermeasure technology for flammable detergent cleaning has made great progress compared with the previous ones.Used more in the pastkerosene, lamp oil as cleaning agent, as FreonTrichloroethaneNew substitutesHydrocarbonSeries of cleaning agents not only minimize the use of aromatics, but also fully considerenvironmental problemsAnd the ignition point is correspondingly high and safe.In addition, closed decompression for cleaning is also developedSteam cleaningThe security of possible systems has been greatly improved.
In order to ignite hydrocarbon solvents, three conditions need to be met:
Presence of igniting steam
There is an ignition source
Presence of oxygen necessary for combustion
These are called the three elements of combustion. Even if one element is missing, the solvent cannot be burned.Automatic fire extinguishing device
Avoid meeting the first condition above "there is igniting steam" when selecting cleaning agent andCleaning systemIs particularly important.Specific countermeasures are as follows:.
a、In order to maintain low steam concentration, proper converter device shall be used
b、Use solvent under the condition of low ignition temperature
becauseCleaning deviceEvaporation of liquid level, taking out non cleaning materials, containers and other operations to clean around the cleaning tankgas concentration High, so the forced exhaust function is provided outside the cleaning device.For not addedHoodThe air must be fully exchanged in the cleaning chamber of the open cleaning device.
During actual cleaning, pressFire Protection LawCategory 2 petroleum (ignition point between 21 ℃ and 70 ℃) and Category 3 petroleum (ignition point between 70 ℃ and 200 ℃) are used for classification of. Recently, the use of Category 2 petroleum has greatly increased due to the importance of drying performance.
In particular, the recommended temperature of the cleaning tank when using the open system should be below 15 ℃ of the ignition point.This is due to gas leakagedetectorThe alarm bell of is set atLower explosive limit1/4, equivalentVapor pressureThe converted temperature is about 15 ℃ below the ignition point.The liquid temperature can easily rise to 35 ℃ in summer or when it is used together with ultrasound, so the material with ignition point above 50 ℃ should be selected.
The second condition "with ignition source" mainly refers to the safety management of the corresponding users of the cleaning system.
Specific countermeasures: 1. Isolation of sparks, open flames, etcpoint source。2. Use explosion-proof electrical components.4. In order to prevent static electricity accumulation, the cleaning machine should be completely grounded.
To partitionIgnition source, prevent the cleaning liquid from entering the cleaning tankheater、Ultrasonic vibratorEquiclosed structure andElectronic systemFor the spark generated, the countermeasures such as separating the control part from the cleaning part and using electronic and mechanical parts with explosion-proof performance shall be adopted.During the cleaning operation, attention shall be paid to: do not put non cleaning materials, keep away from open fire, and fuse sparks and contacts at high temperatureelectric sparkEtc.
Safety countermeasures for ignition source system:
The motor for ring pump and discharge pump shall use "safety increase"Explosion proof structureMotor "or" air driven motor ", etc.
The motor used as the driving source for the movement of the object to be washed uses the "motor with safety and explosion prevention structure" or air cylinder.
The motor of fan for air supply uses "pressure proof explosion-proof structure motor".
Control panelAdopt“Internal pressureExplosion proof structure ".This is because there is an internal ignition source and the internal pressure of the control panel increases through air purificationcombustible gas Non intrusive.
Use of heated combustible materialsElectric heaterAs heating source, when the liquid level drops, the surface of the heater is exposed to the air and becomes high temperaturecombustible liquids Flammable vapors will be generated, which will cause combustion.Therefore, steam should be used when using a strong heating sourceIndirect heatingMode.In addition, the cleaning machine should be grounded, and the detergent to be cleaned should not be rubbed at high speed under the insulation state to prevent static electricity. How to prevent electrification should be considered.The actual cleaning equipment is to use these means to reduce the fire and explosion toMinimum。
5. Isolated oxygen
It is extremely difficult to isolate the oxygen necessary for combustion.This is because there must be oxygen for breathing as long as there are people in the working environment. The oxygen required for isolated combustion isolates the oxygen necessary for breathing.Therefore, it was considered to seal the cleaning tank as a closed structure with random gas, but air must be mixed when taking and placing the cleaned objects, so it is not realistic.Steam cleaning andSpray cleaningAlthough the mode has problems in safety, it is also feasible to prevent combustion by reducing pressure.
In this alternative example, decompression ultrasonic penetration, decompression steam cleaningvacuum drying Such steps are completed in a tank, which is a completely closed system under pressure reduction.Previously usedTrichloroethaneSteam cleaning, post cleaning agent of this system using hydrocarbon cleaning agent (Class 2 petroleum)ConsumptionA reduction of 1/3 of the cost may also be significantly reduced.Cleaning agent via memoryVacuum distillationRegeneratorIt can be reused.
6. Gas concentration detector, etc
That made it impossible to predict when and what kind of leakage would occur and cause trouble after taking the countermeasures described so far.In case of emergency, various disaster prevention devices corresponding to combustible cleaning agents have been sold.gas concentration Detection alarmIt is installed at the lower part of the cleaning tank to monitor the concentration of leakage gas at any time. In case the concentration of steam is close to the explosion limit, an alarm can be given (usually when theLower explosive limit1/4 of the concentration).
In addition, set at the opening of the cleaning tankFoam extinguisherIn case of fire in the tankTemperature sensorDetectedInitial fireIt can automatically stop the equipment while giving an alarm. Devices with the capability of initial fire extinguishing in the tank for a short time are also available for sale.
As mentioned above, fire can be prevented as long as the three elements are not met at the same time.In order to prevent the situation that one countermeasure cannot work normally in the actual equipment, it is also necessary to prevent the dual requirements of the three elements at the same timeProtective measures(Feiyelself's scheme).
Explanation of terms (for various structures as safety countermeasures for ignition sources).
a、 Pressure proof and explosion-proof structure: it is a fully enclosed structure. When the explosive gas inside the container explodes, the container bears the pressure and is not easy to ignite the explosive gas outside.
b、Intrinsic safetyIncreased anti explosion structure: spark or heat will not ignite explosive gas or steam during normal operation and failure of the machineIgnition testOr other methods to confirm that the circuit of the machine has this performance.
c、Safety and explosion prevention structure: in order to avoid spark or high temperature in the parts that should not have spark or high temperature, the structure with special safety added in structure and during temperature rise.
d、Internal pressure explosion-proof structure:title pageenterShielding gas(such as normal air orinert gas）It is a structure that can expel the explosive gas entering before operation, and at the same time, it can continuously prevent the invasion of gas during operation.
Waste liquid treatment
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When the cleaning solution in the cleaning tank cannot ensure the cleaning effect, it will be used asWaste liquid treatment。If there is only one cleaning tank and the concentration of processing oil in the tank exceeds the reference concentration, all the tanks will be discarded.If the processing oil reaches 2% and the cleaning effect cannot be ensured, it will be discarded together with 98% cleaning solution.It is obviously a pity.In addition to the cleaning tank, when there are two and three wetting tanks in total, the first tank will be abandoned when the processing oil concentration of the final tank reaches 2%, and the rear tank will be moved to the front to replenish the final tank with new liquid.When the distiller is introduced into the distiller, the waste liquid of the distiller will be discarded.
DrainageOfprocessing methodGenerally, it is combustion waste.When there is a boiler in the factory for cleaning, it becomes its fuel, and there are also special waste oil boilers and waste oil boilers.When the waste liquid volume is small, use rag to wet it before useIncineratorBurning waste.When burning in your own company, consider the gases emitted from combustion.The burning of detergent fraction does not produce a lot of harmful substances. Since the additives in the processing oil are also burned, it should be selected not to produceHarmful gasProcess oil.
When using chlorine and fluorine containing cleaning agents, special industrial waste treatment companies shall be entrusted for treatment.Depending on the national conditions, there may be different treatment methods, but they should be handled safely in strict accordance with legal standards.
summary
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Since hydrocarbon cleaning agent was soldozone layerDestructive substances or alternatives to chlorinated solvents in Japan andAsiaMotors in various countrieselectronic device, automobile, precision parts, heat treatment and other industries are widely used.
Although the hydrocarbon system has the weakness of flammability and less dryness than the chlorine containing system, it can be fully compensated through the improvement of cleaning equipment.
hisEvaporation lossLow usage, low operation cost, no adverse impact on the environment, and the cleaning performance can also be obtainedAdequate guarantees。Therefore, hydrocarbon system has gradually become the mainstream of cleaning agent.In addition, from the perspective of ISO14000 series environmental management, hydrocarbon cleaning agents are also the most suitable.
