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Dalian University of Technology was prepared by catalytic hydration of ethylene oxide glycol acid-base cooperative homogeneous and heterogeneous catalytic reaction system of catalytic reaction tests, and catalytic activity, selectivity and ethylene glycol reaction conditions were examined. Direct catalytic hydration of ethylene oxide to ethylene glycol homogeneous catalysts used for the Inorganic Salt and heteropoly acid compound. Acid used as K3PMo12O40? 7H2O, inorganic salts as the KI. Hydration can be intermittent, or continuous tank reactor tube reactor for. When the water ratio (mole) of 4-8:1, amount of catalyst was 2% -15%, reaction temperature 100-150 , reaction pressure 0.8-2.1MPa, reaction time 8-30min, pH value of 8-11, the ring ethylene oxide conversion rate of 95.0% -99.9%, 96% selectivity of ethylene glycol; hydrated heterogeneous catalyst used for the supported heteropoly acid (salt) catalyst, support for the -Al2O3 and SiO2, miscellaneous acid and its salts as phosphomolybdic acid, phosphomolybdic acid potassium, phosphorus acid and silicon tungsten acid. Using potassium phosphate molybdate / -Al2O3 as catalyst, reaction temperature 140 , pressure 1.0MPa, water and ethylene oxide molar ratio of 5 under the conditions, when the ethylene oxide conversion rate remained at about 20% , ethylene glycol selectivity over 90%, and when the ethylene oxide conversion rate increased to 80%, the ethylene selectivity dropped to 70%. Shanghai Oil Chemical industry Institute of catalytic hydration of ethylene oxide to ethylene glycol was a more systematic research and development, invented a series of patents. When using -alumina or HZSM-5 zeolite as carrier and 2% -10% of niobium oxide as a catalyst, 0.01% -5% of the zinc or cadmium oxide as catalyst, also contain 1-10% of adhesive agent. Water ratio of 8:1, the pressure is 1.5MPa, temperature 150 , liquid space velocity was 3h-1 conditions, the catalyst composition of 15% Nb2O5, 0.2% CdO, the conversion rate of 100% ethylene oxide , 90% ethylene glycol selectivity. Jiangsu Polytechnic University will be halogen substituted alkyl styrene and divinylbenzene suspension polymerization according to conventional methods, the structure of gel or macroporous copolymer, copolymer and then get three alkyl phosphine in Organic Solvent for season? Reaction, get season? Type anion exchange resin, and the catalyst for the hydration of ethylene oxide catalyst. The temperature of 100 , pressure 1MPa, space velocity of 3h-1 under the conditions of ethylene oxide and water ratio of 1:4.4, the ethylene oxide conversion rate of 99%, and ethylene glycol options of more than 90%. Jiangsu Polytechnic University researchers to HC03-type strongly basic anion exchange resin, using multi-stage fixed bed catalytic reactor in series hydration process (referred to as multi-stage process) on the reaction of ethylene oxide to ethylene glycol has been studied and single fixed bed reactor with the use of single-section technique were compared to study the water and the molar ratio of ethylene oxide (hereinafter referred to water ratio) and the weight hourly space velocity of the multi-stage process of conversion of ethylene oxide and ethylene alcohol selectivity. Experimental results show that compared with single-stage process, multi-technology multi-way feed section, the effective removal of heat emitted from the reactions, reducing the expansion rate of the catalyst improves the catalyst life; in three reactor temperature were 77 , 75 , 70 , the water ratio of 8, weight hourly space velocity of 2.0h-1, pressure 1.0MPa conditions, continuous operation 2880h, ethylene oxide conversion rate of 99% ethylene selectivity of 97% alcohol. Some domestic ethylene oxide / ethylene glycol ethylene oxide unit also carried out experimental work on the direct catalytic hydration. Tianjin Petrochemical completed the industrial side of the line, Research Institute of Tianjin Petrochemical Company adopted the catalyst, water and ethylene oxide molar ratio from 28:1 down to 20:1, while the ethylene glycol selectivity remained at 90%. Hydration ratio of the lower address of the device in high-load production bottlenecks evaporation towers, so EG production capacity by about 25%; Yangzi Petrochemical Company completed the synthesis of pressurized catalytic hydration of ethylene glycol in a pilot that the process is legitimate and non-catalytic process water compared to ethylene oxide conversion and selectivity were increased by 10% or more. Continuous operation for the industrialization process of accumulation and the presence of impurities in the catalyst returns with lower hydration selective, Nanjing University of Chemical Technology and Yangzi Petrochemical Company Cooperation Developed a homogeneous catalytic hydration of ethylene glycol synthesis of process routes. Total amount of water with ethylene oxide, and ethylene carbonate (EC) molar ratio of the total 1.5, the reaction temperature was 60-200 , reaction pressure 0.1-3.0MPa, reaction time 5-240min, experimental results Shell reported data close to the company. The e-commerce company in China offers quality products such as electric gas cookers , multi purpose cooker, and more. For more , please visit electric pressure cookers today!
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