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以 30 %H2 O2 作氧化剂 ,二元羧酸或 8 羟基喹啉等作助剂 ,考察了杂多酸催化环己烯氧化合成己二酸的活性 ,讨论了催化剂和助剂对反应的影响。结果表明 ,钨磷酸在环己烯氧化合成己二酸的过程中显示了较高的催化活性。8 羟基喹啉作助剂时 ,己二酸的收率最高 ,反应 6h ,己二酸的收率可达 75 0 % ;草酸作助剂时 ,反应的最佳条件为 ,n(环己烯 )∶n(H3 PW12 O40 )∶n(H2 C2 O4)∶n(H2 O2 ) =10 0∶1∶1∶5 38,反应温度为 92℃ ,反应时间为 6h ,己二酸的收率可达 70 1%。十六烷基三甲基溴化铵、溴代十六烷基吡啶作相转移催化剂时 ,己二酸的收率也较高 ,反应 6h ,己二酸的收率分别为 73 1%和 71 6 %。对钨磷酸催化环氧环己烷、反 1,2 环己二醇氧化合成己二酸的活性也进行了研究。
Using 30% H2O2 as oxidant, dicarboxylic acid or 8-hydroxyquinoline as assistant, the activity of heteropolyacid catalyzed oxidation of cyclohexene to adipic acid was investigated. The effects of catalysts and auxiliaries on the reaction were discussed. The results showed that tungstophosphoric acid showed high catalytic activity in the oxidation of cyclohexene to adipic acid. 8 hydroxyquinoline as adjuvant, the yield of adipic acid was the highest, the yield of adipic acid was up to 75 0% after reacting for 6h, and the optimal reaction conditions for oxalic acid as adjuvant were n (cyclohexene ): N (H3 PW12 O40): n (H2 C2 O4): n (H2 O2) = 10 0:1:1:5 38, the reaction temperature is 92 ℃, the reaction time is 6h, the yield of adipic acid Up to 70 1%. Cetyltrimethylammonium bromide, cetylpyridinium bromide as phase transfer catalyst, the yield of adipic acid is also higher, the reaction 6h, adipic acid yield 73 1% and 71 6%. The activity of tungstophosphoric acid catalyzed oxidation of cyclohexane and 1,2-cyclohexanediol to adipic acid was also studied.