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Effect of Components and Structure of Hydrotalcites on the Catalytic Activity and Life Time in Transesterification

Author: YuQinQin
Tutor: LiGuangXing
School: Huazhong University of Science and Technology
Course: Organic Chemistry
Keywords: Hydrotalcite Transesterification reaction Diphenyl carbonate Methyl phenyl carbonate
CLC: O643.32
Type: Master's thesis
Year: 2005
Downloads: 129
Quote: 2
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Abstract


Diphenyl carbonate ( DPC ) non - phosgene synthesis of polycarbonate , a key raw material, dimethyl carbonate and phenol transesterification synthesis of DPC is considered to be the most promising synthetic DPC . The hydrotalcite compound ( HTLcs ) in many reactions , due to its special structure and chemical properties with good catalytic activity, selectivity and industrial application prospect . This article will HTLcs for the catalytic synthesis of DPC reaction investigated the structure and chemical composition of HTLcs its catalytic activity . The experimental results show that the layered structure peculiar to HTLcs in Catalytic ester exchange reaction plays an important role , and HTLcs catalytic activity is closely related to their composition . High temperature conditions HTLcs thermal decomposition , its composition and structure will be changed, therefore investigated HTLcs catalytic activity and stability under the experimental conditions of this article . The results showed that the Mg - Al carbonate hydrotalcite having good catalytic activity and catalyst stability in n ( PhOH ) / n ( DMC ) = 4 , the amount of catalyst is of 1.5 % of the total mass of the reactants , T = 160 to 190oC t = 8 h condition DPC yield was 13.9 % , the MPC in a yield of 19.9% ??, the primary product selectivity of 90.6% , its catalytic activity remained unchanged after the catalyst circulation using a cubic ; Zn - Al hydrotalcite preferably catalytic activity , DPC and MPC yield of 19.8% , the transesterification product selectivity of 90.4% , but poor structural stability , the catalyst life is very low . Mg-Al carbonate hydrotalcite has a better application prospects . In addition , using ultrasonic coprecipitation well-crystallized variety of nanoscale HTlcs transesterification reaction test results show that ultrasound of precipitation the method, HTLcs catalytic activity than the conventional co-precipitation method to further improve , in the same experimental conditions , as a catalyst to the Mg-Al carbonate hydrotalcite DPC yield of 13.6 % the MPC yield of 32.9% , the main product selectivity of 94.5% .

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CLC: > Mathematical sciences and chemical > Chemistry > Physical Chemistry ( theoretical chemistry ),chemical physics > Chemical kinetics,catalysis > Catalytic > Catalytic reaction
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