【摘要】 采用平衡级模型研究了苯单独与乙烯或丙烯烷基化反应的精馏过程。计算的塔内温度和液相组成分布与已有实验和非平衡级模拟吻合较好,表明平衡级方法能够准确有效地描述非均相催化反应精馏。在乙烯丙烯同时进料时,考察了苯烯比、苯质量空速、回流比和塔顶压力对烯烃转化率、热负荷和每年总投资的影响。计算表明,当苯与乙烯丙烯进料比分别为3.5和2.0、空速2h-1、回流比10.0、压力0.71MPa、催化剂填装分率18%时,乙烯和丙烯的转化率均能达到100%。同时,反应精馏塔的TAC小于乙烯丙烯分别进行烷基化反应精馏的值,故能降低成本。后续常规精馏塔分离的馏出物中,异丙苯、乙苯和苯浓度均可达到95%以上。更多还原

【Abstract】 The equilibrium(EQ) stage model has been used to simulate the alkylation of benzene with ethylene or propylene by reactive distillation.The calculated temperatures and liquid compositions agreed well with the available experimental data and non-equilibrium(NEQ) stage simulation,indicating that the EQ stage method is accurate and effective as a description of heterogeneous reactive distillation.The effects of varying the feed molar ratio of benzene to alkene,weight space velocity of benzene,reflux ratio and top pressure of the column on the alkene conversion,heat duty and total annual cost(TAC) were evaluated when ethylene and propylene were fed simultaneously.The conversion of both alkenes reached 100% when the molar ratios of benzene to ethylene and propylene were 3.5 and 2.0 respectively,the weight space velocity of benzene was 2 h-1,the reflux ratio was 10.0,the top pressure was 0.71 MPa and the catalyst packing was 18%.Furthermore,the TAC of the mixed feed was less than with ethylene or propylene as a single feed.Using conventional distillation,the separated yields of benzene,ethylbenzene and cumene were all over 95%.更多还原