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Sui C.,Hainan Shihua Jiasheng Chemical Co.
Petroleum Refinery Engineering | Year: 2013

The analysis and comparison of two propylene separation processes in 3rd-generation dilute ethylene to ethyl benzene technology are introduced in respect of process flow, propylene removal rate, material consumption and energy requirement. The primary separation process is simple in process, lower in equipment costs and reduced in energy consumption. But the propylene separation rate is lower, which is only 60. 63 %, and the material consumption per unit of ethyl benzene product is higher. Whereas the secondary separation process is relatively complicated in process flow, increased in equipment costs, higher in energy consumption, but the propylene separation rate is veiy high, which is 99. 01% and favorable for the reduction of energy consumption per unit ethyl benzene product. The comparisons of material and energy consumptions in a case study of benzene/styrene unit in Hainan Shihua Jiasheng Chemical, Co. Ltd. and in SINOPEC Qingdao Refining & Chemical Co., Ltd. show that; the benzene consumption of primary separation process is 0.82 t/t while that of secondary separation process is 0. 75 t/t, the energy consumption per unit product of primary separation process is 8.004 MJ/kg while that of secondary separation process is 9.968 MJ/kg, and the energy consumption per unit product of primary separation process is 1. 964 MJ/kg lower than that of secondary separation process.


Li Z.,Hainan Shihua Jiasheng Chemical Co.
Petroleum Refinery Engineering | Year: 2013

The crystallization phenomenon of oil tar after the recovery of styrene in film evaporator was analyzed. The crystallization possibility of inhibitor was ruled out through production experiment and the metal powder generated in the operation of film evaporator was confirmed to be the intriguing factor for crystallization. Trans-stilbene is produced from isomerization of cis-stilbene which is the polymer of styrene in high temperature at the presence of metal powder. It is easy for trans-stilbene to deposit in crystal form at lower temperature. To solve this problem, thin film evaporator was maintained and the rotor of film evaporator was shutdown to prevent the production of metal powder. After this treatment, no crystallization of oil tar has ever been found and oil tar production is increased.


Zhang Y.,Hainan Shihua Jiasheng Chemical Co.
Petroleum Refinery Engineering | Year: 2014

The commercial demonstration of high-efficiency ethyl benzene dehydrogenation catalyst GS-HA of low water ratio developed by Shanghai Research Institute of Petrochemical Technology is introduced. The 72 hour continuous performance tests confirm that that catalyst can meet the requirements in technical agreement. The dumping density of GS-HA catalyst is 1. 45 kg/L, whereas, the dumping density of original GS-11 catalyst is 1. 38 kg/L. As the dumping density is higher than that of original catalyst, the total loading of GS-HA catalyst is 3 tons higher than that of GS-11 catalyst. But there is little change in the total pressure drop of the dehydrogenation reactor, and there is no impact on the differential pressure of the reactor. The application of ethyl benzene dehydrogenation catalyst GS-HA has reduced the steam consumption of the compressor by 2. 2 tons per hour, which is equivalent to 853. 27 MJ/t. As the result, the energy consumption per ton of styrene is lowered. The inlet pressure of exhaust gas compressor is lowered from 36 MPa to 29 MPa, which has effectively reduced the load of compressor and solved the problem that the compressor's excessive outlet temperature was too high for a long time. But a high reaction temperature must be maintained for low water ratio, which has reduced the operation elasticity of furnace chamber and resistance to process fluctuation.


Peng Z.,Hainan Shihua Jiasheng Chemical Co.
Petroleum Refinery Engineering | Year: 2014

The analysis of three un-uniform dry gas feedings for alkylation reaction in ethylbenzene unit using dilute ethylene, the coordination of temperature rises of different beds and excessive thermal load of furnace and other problems has found that theses problems are mainly caused by the too low temperature of dry gas feed. It is suggested to add a heat exchanger and heat the reactor dry gas feed with 85 °C process condensate from styrene unit to raise the alkylation feed temperature to 70 °C or higher. After taking these measures three dry gas feedings for alkylation reactions are evenly distributed, the bed temperature rise is consistent, the load of recycle benzene furnace is significantly reduced, the fuel gas consumption of recycle benzene furnace is reduced by 174. 33 m3/h the energy consumption of unit styrene product is lowered by 815. 98 MJ/t benzene ethylene, and the annual cost savings is 3,055,800 Yuan (RMB).


Zhang Y.,Hainan Shihua Jiasheng Chemical Co. | Tian Q.,Hainan Shihua Jiasheng Chemical Co. | Ma X.,Hainan Shihua Jiasheng Chemical Co.
Petroleum Refinery Engineering | Year: 2012

The SEB-08 catalyst, the new catalyst developed by SINOPEC Shanghai Research Institute of Petrochemical Technology for alkylation of benzene with dilute ethylene to produce ethyl benzene has been successfully tried in a 85 ,000 TPY commercial unit for production of ethyl benzene from FCC dry gas in Hainan Shihua Jiasheng Chemical, Co. Ltd. The comparison of results of the new catalyst with those used before show that, the SEB-08 catalyst has the advantage of low loadings, easy to be loaded, high resistance to process fluctuation, no need to activation, high activity, high selectivity, good stability, long regeneration cycle and long life time. The benzene to ethylene ratio of SEB-08 catalyst is only 5.3 ∼5. 5 mol. The ethylene conversion is over 97%, the purity of product ethyl benzene is higher than 99. 8% and the xylene impurities in ethyl benzene product are lower than 1. 0 mg/g. The single-pass life of SEB-08 catalyst is over 12 months and total service life is 28 months.

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