Vinyl acetylene is an organic compound with molecular formula CfourHfourIt is mainly used for alkyne compounds that are very needed in industry, and it is used to prepare monomer 2-chloro-1,3-butadiene for synthesis of polychloroprene rubber.[1]
Chinese name
Vinyl acetylene[1]
Foreign name
Vinyl acetylene；Buten-3-yne
chemical formula
CfourHfour
molecular weight
fifty-two point zero four
CAS login number
689-97-4
Melting point
-118 ℃
Boiling point
5 ℃
Density
0.71 g/cm³
Application
Preparation of monomer 2-chloroprene for synthetic rubber
Hazard description
Its vapor forms an explosive mixture with air.Extremely easy to burn and explode in case of open fire and high heat
Appearance and property: gas with acetylene like odor
Relative density (water=1): 0.7095
Relative density (air=1): 1.8
Refractive index: 1four thousand one hundred and sixty-one
Flash point:<- 5 ℃
Explosion limit: 1.17~7.33%
Stability: It is very easy to oxidize into explosive peroxide in the air, which is easy to occurAddition reactionandpolymerization。
Danger sign 4（Flammable gas）It is mainly used for olefins that are very needed in industryAlkyneCompound, monomer 2-chloro - [1,3] - butadiene, etc. for preparing synthetic rubber
Quality standard:
Acetaldehyde/%
<0.1
Divinyl acetylene
nothing
Application: Mainly used in the production of neoprene and adhesive methanol glue.It is also used to produce divinyl ether and methyl vinyl (methyl) ketone based polymers.
Preparation method: acetylene is prepared by dimerization in the presence of cuprous chloride and ammonium chloride hydrochloric acid solution after pretreatment.
Safety: This product is toxic.It has stimulating and anesthetic effects on human body.Poisoning can cause headache, dizziness, dry throat, leg weakness, sometimes vomiting, and nerve, liver and other diseases.The maximum allowable concentration in the air is 001mg/L。The equipment pipeline shall be sealed to prevent leakage.Operators shall wear protective equipment.Packed in steel cylinders, 0.1% wood tar is added as polymerization inhibitor and stored at low temperature.
Production method
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Vinyl acetylene is a complex catalyst (CutwoCltwo+NHfourCI+HCI+HtwoO) The conversion of acetylene into dimer is a complex process. Acetylene is activated under the action of catalyst, and the activated acetylene reacts with normal acetylene to generate vinyl acetylene.The process of producing vinyl acetylene is carried out at 70~80 ℃.In the dimerization of acetylene, in addition to the main product vinyl acetylene, there are also many side reactions, such as the dimer, trimer, tetramer and other compounds that produce vinyl acetylene.Therefore, it is very important to improve the yield of vinyl acetylene by correctly selecting and controlling the process conditions of the reaction.[2]
Packaging, storage and transportation
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1. Packing mark of dangerous goods: 4
2. Precautions for storage and transportation: It has high chemical activity and is stored in a cool, dry and well ventilated non combustible warehouse.The warehouse temperature should not exceed 30 ℃.Keep away from kindling and heat sources.Protect from direct sunlight.It shall be stored separately from oxygen, compressed air, halogen (fluorine, chlorine, bromine), etc.Lighting, ventilation and other facilities in the storage room shall be explosion-proof.Impact and shock are prohibited.The cylinder and accessories shall be handled with care to prevent damage.[3]
Impact on environment
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Health hazards
Invasion route: inhalation.
Health hazard: acute poisoning: headache, dizziness, leg weakness, arthralgia, sweating, dry throat, sometimes nausea, vomiting and diarrhea.After prolonged exposure, neurasthenic syndrome and hypotension may occur.
Leakage emergency treatment
Cut off the ignition source.Wear self-contained breathing apparatus and general fire protection clothing.Cut off the air supply.Ventilation convection, dilution and diffusion.Or it can be led to the furnace or burned in the depression by pipeline.If there is no danger, burn on the spot, and spray water to cool the surroundings to prevent other combustibles from catching fire.The leaking container shall not be reused, and shall be subject to technical treatment to remove the possible remaining gas.
Protective measures
Respiratory system protection: wear air supplied respirator in high concentration environment.
Eye protection: Generally, no special protection is required, and chemical safety goggles can be worn in case of high concentration contact.
Body protection: Wear anti-static work clothes.
Hand protection: wear protective gloves when necessary.
Others: Smoking is strictly prohibited at the work site.Avoid high concentration inhalation.When entering the tank or other high concentration area for operation, someone must supervise.
First aid measures
Eye contact: immediately open the upper and lower eyelids and flush with flowing water for at least 15 minutes.Get medical attention.
Inhalation: leave the site to fresh air.Get medical attention.Treat symptomatically.
Extinguishing method: cut off the gas source.If the gas source cannot be cut off immediately, it is not allowed to extinguish the burning gas, spray water to cool the container, and move the container from the fire site to an open place if possible.Misty water, foam, carbon dioxide.
3. Explosive hazard characteristics: it can form peroxide with air and oxygen, and is easy to explode;Fast decomposition under heating;Heating and explosion when mixed with 1,3-butadiene or oxygen;React with silver nitrate and explode.
4. Storage and transportation characteristics: the warehouse is ventilated and dry at low temperature;Closed storage;Store separately from oxidants and acids;It is not easy to store for a long time to prevent peroxide formation
