Energy-saving butadiene production technology
Butadiene ranks second only to ethylene and propylene in petrochemical olefin raw materials. Butadiene is the main raw material for the production of synthetic rubber (styrene butadiene rubber, butadiene rubber, nitrile rubber, and neoprene). With the development of styrene plastics, copolymerization of styrene and butadiene is used to produce various resins with a wide range of uses (such as ABS resin, SBS resin, BS resin, MBS resin), making butadiene increasingly important in resin production status. In addition, butadiene is still used to produce 1,4-butanediol (engineering plastics), dinitrile (nylon 66 monomer), sulfolane, tetrahydrofuran, etc., so it is also an important basic chemical raw material.
This technology is used for the oxidative dehydrogenation of butene to produce butadiene. In the entire process, a series of energy-saving technologies are applied to ensure high conversion rate and high selectivity, while greatly reducing production energy consumption.
This technology adopts a multi-stage adiabatic fixed-bed reactor process, uses waste heat boilers between the stages, and uses combined equipment such as feed and discharge heat exchangers, post heat exchangers and compression heat pumps to save energy in the process of butadiene oxidative dehydrogenation to butadiene .
Ruihua Chemical also uses a special feed distribution method to feed oxygen-containing gas, butene and water vapor into each stage of the reactor according to a certain ratio. The product selectivity and catalyst life can be greatly improved.
In addition, Ruihua Chemical has developed a catalyst that is more suitable for butene oxidative dehydrogenation, which has been verified to meet the requirements of oxidative dehydrogenation and has excellent process indicators.
The feed temperature of butene oxidative dehydrogenation is 315~400℃, and the output temperature is 420℃~500℃. This process adopts the method of taking heat between sections to control the feed temperature of the reactor in the latter section, and generate medium-pressure steam for recovery. And compression heat pump technology is used in the process, which is different from the commonly used refrigerant heat pump technology. Its efficiency is 50~90%. The low-level energy heat source in this heat pump recovery system is used to generate low-pressure steam, which is incorporated into the system's steam pipe network.
● Proper oxygen-to-ene ratio and mild reaction conditions reduce the chance of carbon formation in the system, extend the life of the catalyst, and increase product selectivity.
● The butene and water vapor are fully fed at one time, and the air enters the reaction system separately, and the reaction is gentle, so the water to ene ratio can be reduced to about 8.
● With the application of energy-saving technology, the device has a significant energy-saving effect. The steam by-produced in the reaction stage can produce considerable economic benefits.
● For high-power electrical equipment, choosing a suitable turbine drive mode will also make a greater contribution to energy saving.
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