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The Synthesis of Ethylbenzene by Alkylation of Benzene with Bromoethane

Author: ZhengYanPing
Tutor: ZhouXiaoPing
School: Hunan University
Course: Chemical Engineering and Technology
Keywords: Ethylbenzene Dibromoethane Benzene Alkylation reaction HZSM-5
CLC: TQ241.1
Type: Master's thesis
Year: 2009
Downloads: 9
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Abstract


Ethylbenzene is an important organic chemical raw materials , mainly used in the production of styrene . At present, the industrial production of ethylbenzene to benzene and ethylene as raw material, was prepared by alkylation reaction . Ethylene mainly by oil cracking ethane steam reforming dehydrogenation , high energy consumption , CO 2 emissions from large , so if synthesis of ethylene- ethane in the natural gas as raw material by non- ethylene pathway benzene, is of great significance in reducing energy consumption and reduce CO 2 emissions . This thesis is in the Task Force developed based on ethane bromine oxidation of bromoethane , bromoethane ethylbenzene alkylation of benzene with new technology research, to explore the synthesis of ethane and benzene by non- ethylene pathway ethylbenzene new method. The paper first examines the impact of different aluminosilicate HZSM-5 than dibromoethane conversion and product distribution , to filter out the best aluminosilicate HZSM-5 catalyst ratio ( Al ratio of 140) , and the aluminosilicate than the HZSM-5 as a carrier for the inspection of the different metal oxides load and different load , investigated results showed the 2wt% ZnO/HZSM-5-140 catalytic performance . Filter out the best catalyst system investigated the effects of reaction conditions on the reaction temperature , benzene and bromoethane molar feed ratio , WHSV dibromoethane conversion rate and product distribution , in order to determine the optimal reaction conditions: nitrogen gas as the carrier gas flow rate 5ml/min , temperature 360 ° C , benzene and dibromoethane molar feed ratio of 6:1 , dibromoethane quality a airspeed 0.37H -1 . Dibromoethane conversion rate of 99.5% or more can be obtained under the reaction conditions , and 92.2 % ethylbenzene selectivity and catalyst life of up to 650h ( dibromoethane conversion rate gt ; 99.5 %) . In addition , this thesis , the catalyst life under different reaction conditions examined , the study results show that in the investigated temperature range ( LT ; 420 ° C ) catalyst deactivation is mainly caused by the catalyst surface area carbons , and after deactivation of the catalytic The 500 ℃ oxygen regeneration. Finally , the research work carried out the bromoethane with benzene reaction mechanism discussed that dibromoethane first acid on the central role in the molecular sieve during the reaction to form ethyl positive ions , the formation of ethyl positive ions with benzene electrophilic substitution reaction of ethylbenzene .

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CLC: > Industrial Technology > Chemical Industry > Basic Organic Chemistry Industry > The production of aromatic compounds > Aromatic hydrocarbons > Single- ring hydrocarbons ( benzene, hydrocarbon )
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