无机盐在HZSM-5催化乙酸环己酯水解反应中的作用

发布时间：2019-04-11 16:35

【摘要】：考察了无机盐(NaBr、ZnSO_4、NaHSO_4)对HZSM-5催化乙酸环己酯水解制备环己醇反应的影响。结果表明,无机盐可以增加反应体系的极性,抑制乙酸环己酯热分解副反应(β-消除反应)过渡态的生成,从而提高环己醇的选择性。同时,无机盐会破坏HZSM-5表面B酸中心,降低其催化活性。单独使用NaHSO_4对乙酸环己酯水解反应也具有较好的催化性能,在适宜条件下,乙酸环己酯转化率达到63.8%,环己醇选择性达到90.9%;重复使用时,由于乙酸在反应体系中的积累,乙酸环己酯转化率有所降低,环己醇选择性基本不变。
[Abstract]:The effect of inorganic salts (NaBr,ZnSO_4,NaHSO_4) on the hydrolysis of cyclohexyl acetate to cyclohexanol catalyzed by HZSM-5 was investigated. The results show that inorganic salts can increase the polarity of the reaction system, inhibit the formation of transition state of the thermal decomposition side reaction of cyclohexyl acetate (尾-elimination reaction), and thus improve the selectivity of cyclohexanol. At the same time, inorganic salt can destroy the B acid center on the surface of HZSM-5 and decrease its catalytic activity. The hydrolysis of cyclohexyl acetate was also catalyzed by NaHSO_4 alone. Under the suitable conditions, the conversion of cyclohexyl acetate reached 63.8% and the selectivity of cyclohexanol reached 90.9%. During reuse, the conversion of cyclohexyl acetate decreased and the selectivity of cyclohexanol remained unchanged due to the accumulation of acetic acid in the reaction system.
【作者单位】：河北工业大学化工学院河北省绿色化工与高效节能重点实验室;
【基金】：国家自然科学基金项目(21236001,21176056) 河北省自然科学基金项目(B2015202228) 河北省高校百名优秀创新人才项目(BR2-208)资助
【分类号】：O643.3;TQ233.1

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