TS-1催化合成环氧丙烷

RESEARCH ON TS1 CATALYZED SYNTHESIS OF PROPYLENE OXIDE

研究了ＴＳ１催化下的丙烯与Ｈ２Ｏ２的环氧化过程，考察了操作条件对反应的影响，发现较低的温度（３０～５０℃）、压力（０．４～０．６ＭＰａ）以及Ｈ２Ｏ２浓度（１．０ｍｏｌ／ｋｇ）对反应有利。产物环氧丙烷与溶剂甲醇在沸石表面酸性中心的催化下反应生成丙二醇单甲醚是主要的副反应，副产物丙二醇单甲醚堵塞了沸石孔道引起催化剂失活。失活后的催化剂可以通过灼烧或用溶剂洗涤恢复活性。用盐类对催化剂进行预处理后催化剂性能没有提高。某些添加剂会引起催化剂失活。

In this paper, the process of epoxidation of propylene with H 2O 2 catalyzed by TS1 was studied and the effect of different parameters on the reaction was described It was found that modest temperature (30￣50℃), low pressure (0 4￣0 6MPa) and dilute H 2O 2 concentration (1 0mol/kg) are profitable to the reaction The main side reaction is the solvolysis of propylene oxide with methanol, which is catalyzed by the acidic sites on the zeolite The byproduct was a mixture of the two isomers of propylene glycol monomethyl ether and they jammed the channels, leading to the deactivation of TS1 The deactived catalyst can be regenerated either by calcination (550℃, 2h) or by washing with methanol, above reaction temperature (such as, 60℃, 60min) The effect of pretreatment and additives on the performance of the epoxidation was also investigated It was found that the pretreatment could not improve the performance of the catalyst and some additives even made the catalyst deactived so that they both were unnecessary