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论文类型：会议论文

发表时间：2003-01-01

收录刊物：Scopus

卷号：48

期号：2

页面范围：902-903

摘要：The effects of catalyst activation and the reaction conditions on the methylation of 4-methylbiphenyl (4-MBP) with methanol over MgO/CBV8020 were investigated. With an increase in the reaction temperature, the conversion of 4-MBP decreased and the selectivity to 4,4  -dimethylbiphenyl (4,4  -DMBP) first increased, then decreased. With an increase in the reaction temperature, the isomerization of 4-MBP into 3-MBP increased, as well as the isomerization of 4,4  -DMBP into 2,3  - and 3,4  -DMBP. The effect of reaction time on the methylation of 4-MBP with methanol showed that both the conversion of 4-MBP and the selectivity to 4,4  -DMBP decreased with reaction time. Moreover, the addition of water in the feed did not favor methylation of 4-MBP with methanol. With an increase in the amount of mesitylene, both the selectivity to 4,4  -DMBP and 4-MBP conversion increased a little. However, the activity stability improved a lot, after 375 min reaction, the selectivity to 4,4  -DMBP was    80%, and 4-MBP conversion was    8%.