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4-氯-1,2-二甲基苯的高选择氯代合成新方法

A Novel Synthetic Method of 4-Chloro-1,2-Bimethyl-Benzene by High Selective Chlorination Reaction
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摘要 芳香族化合物的芳环选择性氯代,在经济和环保上都是一个重要的课题。采用一种新型的氯代体系——HCl-H2O2-CH3COOH体系,对邻二甲苯进行氯代。相比于传统的路易斯酸-含硫催化剂体系和沸石催化氯化体系,有选择性高、产率高、操作简单、经济环保等优点。反应温度为70℃,H2O2与邻二甲苯的物质的量比为5.0,HCl与邻二甲苯的物质的量比为4.0,反应时间为2 h,反应过程中温度始终控制在90℃以内,在此条件下原料转化率可达到99%以上,产品收率为96.9%,选择性为99%以上。 The selective chlorination reaction of the aromatic ring among the aromatic compounds is very important in the economy and environmental protection aspects. A novel chlorination reaction system HCl-H2O2-CH3COOH was applied to react with o-xylene. Compared to the traditional Lewis acid catalysts which comprised sulfur and zeolite catalytic chlorination system, it took on much superiority such as high-selectivity, high-yield, simple operation, savings and environmental protection etc. The reaction conditions were controlled, the molar ratios of hydrogen peroxide, hydrochloric acid to o-xylene were 5.0,4.0 respectively, the reaction was processing under 70 ℃ until the feeding was finished and then the reaction was 2 h under 90 ℃. The conversion ratio of the raw material is over 99%, the yield is 96.9% and the selectivity is over 99% under this condition.
作者 钱建华 张庆春 刘琳 邢锦娟 龚树华
机构地区 渤海大学应用化学重点实验室
出处 《石油化工高等学校学报》 EI CAS 2007年第1期39-41,47,共4页 Journal of Petrochemical Universities
基金 辽宁省优秀人才支持计划项目(RC-05-09)
关键词 路易斯酸 选择性 对位氯化 Lewis acid Selectivity p-Chlorination
分类号 O643.32 [理学—物理化学]
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参考文献13

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石油化工高等学校学报
2007年 第1期

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