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关键词： 乙苯；苯乙烯；设计；工艺；技术

Annual production of 300,000 tons of styrene process design.

General description of design: In the first quarter of 2018, many changes have taken place in styrene industry, preliminary establishment of anti-dumping, and new equipment production, Less imports,high profit and high load maintained by the enterprise, and so on. All of this is rattling the nerves of economic markets, three quarters of 2018 years ago, China still has a huge import demand, the production of styrene will pay more attention to the downstream industry demand: the outer wall heat preservation, cars, air conditioners, packaging, electronic appliances and other fields, is expected in the next period of time, major import pattern changes will occur with styrene from South Korea and the United States will reduce, domestic demand for styrene will continue to rise. Styrene is an important industrial aromatic monomer, mainly used in the production of polystyrene and butadiene copolymer. The process of producing styrene by direct dehydrogenation of ethylbenzene (EB) accounts for 85% of commercial production. The use of steam as a thinner is an important part of this process because it has several functions: it provides heat for the reaction; Reduce the local pressure, prevent the formation of coke, improve the conversion of ethylbenzene EB.

From the design through a series of design and calculation of the technological process, reaction process, equipment selection, plant layout, economic analysis, environmental protection, safety in production, such as Angle, comprehensive discusses the annual output of 300000 tons of styrene production processes, and comprehensively analyzes the domestic existing under the condition of the rationality and feasibility of the production scale.

styrene is an important basic organic chemical raw material, which can be used to manufacture resins, coatings and insulators. It can also be used in pharmaceutical, dyestuff, pesticide and mineral processing industries.the technology of Ethylbenzene dehydrogenation to styrene is mature, and the yield of styrene is high. The main task of this design is to design the process flow of producing 300,000 tons of styrene annually from ethylbenzene. The process design is optimized by material balance, heat balance, equipment type selection and calculation, which makes it reasonable and feasible.

Design initial conditions are as follows: the annual output of styrene is 300000 tons, for dehydrogenation reactor, the operating condition is 0.08 Mpa, which is low-pressure reaction, reaction temperature is 600-660 ℃, for the design of the rectifying column, the operating conditions for atmospheric pressure, the bubble point liquid feed and reflow, according to the above conditions for the design of the dehydrogenation reactor and rectifying column.

Raw materials including water vapor and ethylbenzene for ethylbenzene dehydrogenation to styrene, the mass fraction of 5% impurity is contained in water vapor, ethylbenzene contained 1% of the impurities, the design for the annual output of 300000 tonnes in more than 99% of the purity of styrene.

Design standards: this topic references to the latest domestic and foreign literature, compareing the Lummus/UOP ethylbenzene dehydrogenation process, Fina/Badger and Smart three ethylbenzene styrene process method, finally I choose the combination of Lummus/UOP and Smart approach to design the process. In the reaction process,besides two dehydrogenation reactor ,there is a new oxidative dehydrogenation reactor. In order to get more styrene products oxygen reacts here, which breaks the heat balance; In the separation section, the raw styrene obtains from the tower kettle and enters the styrene distillation column for further purification.The light component aromatics and alkanes distills from the top of the tower, which are successively obtained by ethylbenzene tower and benzene/toluene tower, respectively. The ethylbenzene from the ethylbenzene tower can enter the reactor with the fresh material ethylbenzene and participate in the reaction again. Benzene and toluene can be sold as products. The whole process, not only obtains as much styrene product as possible, also follows the principle of sustainability. The aromatics and alkanes obtained from the separation process are further utilized.