Ethanol As Alkylating Agent Of Technology

Continuous Process Route between the dehydration of ethanol produces ethylene and the reaction of alkylation of benzene with ethylbenzene directly was investigated in this paper.in order to find out proper Process Route. At the same time, the impaction of reaction results from trace water contained in the catalyst were studied. The paper content several facets as follows:The dehydration of ethanol produces ethylene on Zeolite Catalyst, effects of temperature and space velocity on the reaction were mainly studied. ultimately suitable process conditions were determined. they were: temperature: 250℃, space velocity:1h-1,reaction pressure is atmospheric pressure. Under these conditions, dehydration reaction were carried out, and ethanol conversion rate can reach above 94%, utilization of ethanol can reach 91%.The parameters ofβ-zeolite-base catalyst and MCM-22 modified catalyst for preparing ethylbenzene from benzene and ethylene by alkylation were optimized using response surface method (RSM). Forβ-zeolite-base catalyst, a response surface method was conducted to get the following optimal parameters: reaction temperature: 154℃, reaction airspeed: 2 h-1 and reaction molar ratio: 1/3. The conversion of benzene and selection of ethylbenzene under these optimal parameters respectively are 56.274% and 86.592%. For MCM-22 modified catalyst, a response surface method was conducted to get the following optimal parameters: reaction temperature: 150℃, reaction airspeed: 3.8 h-1 and reaction molar ratio: 1/6. The conversion of benzene and selection of ethylbenzene under these optimal parameters respectively are 20.142% and 94.673%. The experimental values are very similar to the computer simulation values, consequently,β-zeolite-base catalyst and MCM-22 modified catalyst for preparing ethylbenzene from benzene and ethylene by alkylation using response surface method is not only accurate and reliable, but also has practical values.The impaction of the catalytic activity of trace water in the Raw. Trace water would occupy the acid catalyst active site in the process, in the result, catalyst deactivated rapidly, so it was ensured the purity of materials in production.