AndCarbonyl compoundThe reaction produces alkynol to produce acetylene homologues and other ethynyl compounds.It emits flammable gas when contacting with water.Causes serious skin burns and eye damage.
1. OnTetrahydrofuranPreparation in monotoluene: heat 300g na and 400g toluene to 105-110 ℃ in a reactor equipped with a shaker and a reflux condenser.When sodium dissolves in toluene, stir the mixture vigorously for several minutes. After stirring stops, let the mixture cool to room temperature.Add 900g tetrahydrofuran into the suspension, inject acetylene into the mixture, and slowly heat the mixture. If necessary, cool it carefully to keep the temperature below 50 ℃.After 3-4 hours, the temperature of the mixture drops to obtain quantitatively produced sodium acetylene.
2. Preparation in liquid ammonia:Mechanical agitatorPut about 1 liter of liquid ammonia into a 2-liter three neck flask.Introduce dry acetylene fast flow into liquid ammonia, add 23g sodium within 30min, and then reduce acetylene flow.
purpose
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AndCarbonyl compoundThe reaction produces alkynol to produce acetylene homologues and other ethynyl compounds.[2]
Hazard Overview
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Overview of emergency: release flammable gas when encountering water.Causes serious skin burns and eye damage.
GHS hazard category:
Substances and mixtures that emit flammable gases in contact with water Category 2
Skin corrosion/irritation category 1B
Warning words: danger
Hazard description: H261 emits flammable gas when encountering water.
P260 Do not breathe dust/smoke/gas/smoke/vapor/spray.
P264 Clean thoroughly after operation.
Accident response:
P302+P335+P334
P370+P378 In case of fire: use fire extinguisher to extinguish the fire.
P301+P330+P331 If swallowed by mistake: gargle.Do not induce vomiting.
P303+P361+P353 If the skin (or hair) is contaminated: take off all contaminated clothes immediately.Rinse skin/shower with water.
P363 The contaminated clothes can be reused after cleaning.
P304+P340 If inhaled by mistake: transfer the person to a place with fresh air and keep a comfortable position for breathing.
P310 Call the detoxification center/doctor immediately.
P305+P351+P338 In case of eye contact: Rinse carefully with water for several minutes.If you wear contact lenses and can easily take them out, take them outcontact lenses。Continue flushing.
Safe storage:
P402+P404 Store in a dry place.Store in a closed container.
P405 The storage place must be locked.
Waste disposal: P501 dispose the contents/containers according to local regulations.
Physical and chemical hazards: release flammable gas in contact with water.
Health hazard: causing serious skin burns and eye damage.[2]
Transport information
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UN No. Dangerous goods No. (UN No.): UN3399
UN shipping name: ORGANOMETALLIC SUBSTANCE,LIQUID, WATER- REACTIVE, FLAMMABLE
UN hazard classification: 4.3
Packing group: I
Packing method: packing according to the method recommended by the manufacturer, such as open steel drum.Ordinary wooden case outside the ampoule bottle.Screw mouth glass bottles, iron cap pressure mouth glass bottles, plastic bottles or ordinary wooden boxes outside metal barrels (cans), etc.
Marine pollutant (yes/no): no
Precautions for transportation: transport vehicles shall be equipped with corresponding types and quantities of fire-fighting equipment and leakage emergency treatment equipment.It is strictly prohibited to mix with oxidants, edible chemicals, etc.The exhaust pipe of the vehicle transporting this article must be equipped with fire arresting device.When tank (tank) trucks are used for transportation, there should be grounding chains, and hole partitions can be set in the tank to reduce static electricity generated by vibration.It is prohibited to use mechanical equipment and tools that are easy to generate sparks for loading and unloading.It is better to transport in the morning and evening in summer.During transportation, it shall be protected from sun exposure, rain and high temperature.Keep away from kindling, heat source and high temperature area during stopover.Road transportation shall be carried out according to the specified route, and do not stay in residential areas and densely populated areas.It is forbidden to slip during railway transportation.It is strictly prohibited to transport in bulk by wooden boat or cement boat.Danger signs and announcements shall be posted on the means of transport according to relevant transport requirements.[2]
