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The main methods for preparing acrylic esters are: direct alkyd esterification, acid chloride esterification, and transesterification. By reacting methyl methacrylate with different alcohols, corresponding acrylates and methanol can be obtained. Through transesterification, DMAEMA, BMA, 2-ethylhexyl methacrylate, etc. can be used.
The catalyst used in the transesterification method is traditionally mainly an inorganic acid, an organic acid or an acid salt thereof, and the advantage is that the price is relatively cheap. However, they are highly corrosive and have strict requirements on equipment, equipment and operating conditions. And the reaction time is long, the side reactions are many, the three wastes are serious, and the color of the product is easy to darken. Such catalysts will be phased out in the transesterification process. Non-acid catalysts are a new direction for development in recent years. Its main features are no corrosion, good product quality, light color, few side reactions, and mild reaction conditions. Organotin compounds, titanic acid compounds and alkali metal alkoxy compounds are ideal catalysts for transesterification. As long as the problem of recycling and reuse is solved, they will be widely used in future industrial production.
Hazardous characteristics: flammable, its vapor can form explosive mixture with air, and it will cause fire and explosion when exposed to fire and high heat. Under the action of heat, light and ultraviolet light, polymerization is easy to occur, and the viscosity gradually increases. In severe cases, all monomers in the entire container may undergo irregular explosive polymerization. Its vapor is heavier than air and can spread to a relatively low place at a lower place. It will ignite when it comes to a fire source.
Hazardous combustion products: carbon monoxide, carbon dioxide.
Fire extinguishing methods: Firefighters must wear full-body fire and gas protective clothing and extinguish the fire in the upwind direction. In the event of a fire, firefighters must operate in a protective shelter. Fire extinguishing agent: solvent-resistant foam, carbon dioxide, dry powder, sand. Water extinguishing is not effective, but water can be used to keep the containers in the fire area cool.
Emergency treatment: Quickly evacuate personnel from the leaked contaminated area to a safe area and isolate them to strictly restrict access. Cut off the fire. It is recommended that emergency handlers wear self-contained positive-pressure respirators and antistatic work clothes. Cut off the source of the leak if possible. Prevent from flowing into restricted spaces such as sewers and flood drains. Small leaks: Absorb with sand, vermiculite or other inert materials. Or brush with an emulsion made of a non-combustible dispersant, and dilute the lotion into a waste water system. Large spills: build dikes or dig pits for containment. Cover with foam to reduce steam disaster. Spray water or foam cools and dilutes steam to protect field personnel. Use explosion-proof pump to transfer to tanker or special collector, recycle or transport to waste disposal place for disposal.
Our company can also provide MMA Purification Plant, welcome to consult.