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膨润土的改性及其在牙膏中的应用
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作者 丁时华 《四川日化》 1989年第1期7-13,60,共8页
关键词 膨润土 牙膏 膨润土应用
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膨润土主要应用领域的发展趋势
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作者 周桂华 《建材工业信息》 1989年第1期18-19,共2页
联邦德国的JOST最近研制出一种用于筛选碎石和石英的二层和四层筛选机,设计型号分别为SWZ和SWD,现已通过西米德兰的Willenhall的FTL工程有限公司提供给英国用于采矿和采石工业。
关键词 膨润土 膨润土应用
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Study on Activated Bentonite Applied to tert-Butylation of Toluene
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作者 Chen Linbo Shi Li (Department of Petroleum Processing,East China University of Science and Technology,Shanghai 200237) 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2011年第1期38-44,共7页
tert-Butylation of toluene with tert-butanol used as the alkylating agent was investigated over the activated bentonite and HY zeolite used as the catalyst.The influences of various butylation reaction parameters,incl... tert-Butylation of toluene with tert-butanol used as the alkylating agent was investigated over the activated bentonite and HY zeolite used as the catalyst.The influences of various butylation reaction parameters,including the toluene/tert-butanol ratio,the reaction temperature,and the space velocity were discussed.The optimal results were obtained at a reaction temperature of 180 ℃,a space velocity of 4 h-1,and a mole ratio of toluene to tert-butanol equating to 2.The structure and acidic properties of catalyst were characterized by the BET method and the Fourier transform infrared (FTIR) spectroscopy.Compared with the HY zeolite,the activated bentonite possessed high activity for toluene conversion and high para-selectivity because it had larger pore diameter,smaller micropore surface area and higher ratio of total Lewis acids to total Br nsted acids. 展开更多
关键词 t-butylation activated bentonite p-tert-butyltoluene pore diameter Lewis acid
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