Discussion on Batch Condensation of Vacuum System Belt

Oinm / Introduction U Tian Chong (11 men, 1 Hunan Longhui County native, economist, Bachelor of Science. Engaged in the management of polyester devices and production technology" 10 in the PTA direct esterification batch polycondensation device Due to the unreasonable vacuum system design or installation, or the non-standard process control, the monomers or oligomers in the polycondensation reactor can easily be brought into the condensation polymerization reactor top and the vacuum system together with the EG that is devolatilized by the polycondensation reaction. According to different device conditions, different degrees of blockage of vacuum pipes, condensers, intermediate buffer tanks, etc., and more serious blockage of steam jet pump nozzles and rough EG discharge pipes; thus causing great harm to the slice production plant These monomers or oligomers form a PET resin with a complete crystallinity and a relatively high melting point under certain conditions, the higher the flow rate of the monomer into the polycondensation reactor, the more obvious the “bumping” phenomenon, and the greater the differential pressure AP between the inside and the outside of the polycondensation reactor. Larger, more material in the kettle is carried along with the EG gas; the higher the pressure of the material, the higher the gas velocity of the nitrogen and EG gas passing through the extraction port of the polycondensation tank at the end of the guide material, so that the pressure inside and outside of the condensation polymerization reactor The worse the AP, the greater The more factories, the more aware of the deviations in this issue, believe that the use of N2 material can only be achieved if the material can be pressed into the polycondensation reactor.The authors saw in factories in Jiangsu and Fujian, even in the same plant. Line, the pressure of the guide material is also 0.~0.3MPa.

2. The effect of the lack of the device itself is proportional to the quadratic of the flow diameter. By formula (2) we can see that the fluid line should not be too thick; however, some factories have excessively saved construction funds. The higher the vacuum temperature and the higher the vacuum, the higher the fluid velocity. Under the condition that the capacity of the pump is not changed by the formula, the partial vacuum pipeline is designed to be too thin. It can be seen that the greater the inlet pressure is, the more the flow rate of the outlet fluid is stupid. The toe leads to the condensation of iEGr before it is condensed until the temperature is released. Waiting for the reaction temperature bookmark2 ensures that the polycondensation reaction can be achieved. According to the standard curve of the device suitable for the establishment of vacuum, while avoiding the waste of construction funds, the degree of vacuum system to a certain degree, the system vacuum is high, the system began to a large number of EG out, at this time inside and outside the polymerization reactor differential pressure Larger, more material will be brought out. The author discovered that such phenomena were very serious in individual factories in Jiangsu, Guangdong, and Fujian. Among them, a slice plant in southern Jiangsu had a vacuum system at least for every class because of a small vacuum line. The production was very passive; there were also some factory vacuum lines. Too long and too thick, causing the system to establish a slow vacuum in the early stage, EG can not be discharged in time, the same with the vacuum pipeline similar to the phenomenon of serious material. In addition, the installation of the vacuum pumping system is not correct, and it also causes the fluctuation of the vacuum, resulting in a noticeable phenomenon of feeding.

The influence of decompression program design and unreasonable temperature control is due to the slow polycondensation reaction and small equilibrium constants. Therefore, the diffusion and transfer of polycondensation products have a great influence on the reaction. Guangzhou: Sun Yat-sen University published Shanghai Medical Design Institute. Chemical Process Design Handbook (2nd Edition). Beijing: Chemical Industry Press, 1996. Middle School Physics Teacher's Manual Compilation Team. Secondary school physics teacher's manual. Shanghai: Shanghai Education Press, 1984. Bellow, Xu Chi. Polyester Handbook (second edition). Beijing: China Textile produces Zhang Min. Polyester production and application. Beijing: Sinopec Press, 1997. Corporate Introduction Suzhou Wuzhong Honghai Chemical Co., Ltd. is the Dow Chemical Company's China-based thermal oil agent, which specializes in the sale of original packaging imported from Dow Chemical Company. Thermal oil DowthermA (biphenyl-diphenyl ether mixture, the maximum use temperature of 400C), DowthermRP (diaryl alkane, the maximum use temperature of 350C) and other products. The product has been widely used among customers in Guangzhou, Foshan, Zhuhai, Xinhui, Kaiping, Shantou, Fujian, Jiangsu, Shanghai, Beijing, Tianjin, Shandong, Heilongjiang, Liaoning, Jilin, Sichuan, Zhejiang, Luoyang, Shaanxi, and Hubei. Use, welcomed the new and old customers use the United States Dow Chemical Company's original packaging imports of heat-conducting oil products, our company will continue to do a good job of the polyester chemical fiber industry, heat-conducting oil supply and service work.

Unit: Suzhou Wuzhong Honghai Chemical Co., Ltd. Address: Puzhuang Town, Wuzhong District, Suzhou, Jiangsu Province Postcode: 15105 General Manager: Lv Zhenjiang

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