Ethylene co-unit time through the 72-hour performance test, become the largest dry gas law styrene plant.

Evaluation results show that: the set of devices produced 99.96% purity styrene, ethylbenzene unit consumption 1.068 tons / ton styrene, dehydrogenation reactor, exhaust compressors, crude styrene tower key equipment operating normally, all targets were meet the design requirements. Along with PS, ABS device of the reconstruction and extension, of the demand will be a substantial increase in styrene, while the present Guonei ethylene-based VAM Shengchan rely heavily on imports of styrene, Liyongcuihua cracking of dry air as the raw material Jianshe Lian styrene unit Duiyu Enterprise has important practical significance. Daqing Petrochemical Co., Ltd. in Blue Catalytic Cracking (DCC)-product of the joint components of a large number of ethylene-rich gas, and this part of the dry gas in the past can only be burned as fuel, causing a great waste of energy. To take full advantage of this part of the by-product of dry gas, so that fuel from the low value to a very high value-added chemical products, extend product chain, and improving economic efficiency and competitiveness, Daqing Petrochemical Co., Ltd. in the blue building the 80,000 t level ethylbenzene / styrene combined unit.

The joint device includes two parts, ethylbenzene and styrene.

Ethylbenzene unit used by the Chinese Academy of Sciences , Fushun Petrochemical Company and Luoyang Petrochemical Engineering Corporation in the FCC dry gas joint development of third generation technology ethylbenzene; styrene unit used by the Shanghai Petrochemical Institute, East China University, Shanghai Engineering Co., Ltd. jointly developed technology vacuum dehydrogenation to styrene. The device uses dry gas ethylbenzene is shallow dilute ethylene refining technology, and foreign refining the basic skills very dilute ethylene. Comparison of two technologies from the point of view, the reaction of foreign technology, the conversion of higher hydrocarbons, hydrocarbon-based anti-domestic technology higher conversion rate. Ethylbenzene and products from the comprehensive energy consumption of the fixed terms of comparison, the domestic dry gas catalytic ethylbenzene CDTECH technology and foreign technology rather dilute ethylene ethylbenzene. However, refined shallow depth requirements of domestic technology and production costs in both raw materials has advantages.

Compared to other similar devices with the domestic, the combined device is a clear advantage of dry gas content of up to 40% or more of ethylene, is 1 times more than other devices, lower power consumption.

The world with ethylbenzene styrene Preparation There are three main methods, namely, a total of combined oxidation, catalytic dehydrogenation of ethylbenzene and butadiene, of which total oxidation process complexity, equipment, easy corrosion, and propylene oxide byproduct. Butadiene method has been eliminated.

Current domestic production of styrene to ethylbenzene catalytic dehydrogenation dominated total production capacity of its production capacity of approximately 90% of styrene. The most advanced technology for the ethylbenzene dehydrogenation Shanghai Research Institute of Petroleum, East China University of Science and Shanghai Engineering Company jointly developed technology of ethylbenzene dehydrogenation to styrene, the basic process routes and Lummus / UOP ethylbenzene removal company hydrogen technology the same technology level is almost same, but the royalty is low, the design cycle is short, has been in China Jinxi, Jinzhou, Hainan, and other sets of production device applications, technology is mature and reliable and work well.

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