合成异丙苯的高循环量与低苯烯比反应技术

采用等温积分反应器，在3MPa、160～190℃和苯/丙烯摩尔比4～12条件下，研究了YSBH-01催化剂上苯与丙烯烷基化合成异丙苯的动力学。结果表明，异丙苯合成属于快速反应，扩散是控制步骤。170℃、3MPa条件下的循环实验表明，部分产物循环可在新鲜进料苯/丙烯摩尔比较低情况下，仍保持较高的反应区苯/丙烯摩尔比，异丙苯选择性仅下降1%～2%，对其它副产物无明显影响；而同等条件下无再循环，异丙苯选择性下降近20%，副产物也明显增多。

Cumene synthesis under high recycle rate and low benzene/propylene mole ratio in feed

The kinetic experiments of cumene synthesis from benzene and propylene over a domestic molecular sieves catalyst, YSBH-01, were carried out in an integral micro-reactor under the following conditions: 3MPa, 160～190℃ and benzene/propylene mole ratio=4～12. The results indicate that the surface catalytic reaction of this system occurs much faster than the reactant diffusion in- and out-side the catalyst pellets. Partial product recycle flow experiments were also carried out under 170℃ and 3MPa, and it shows the mole ratio of benzene to propylene in the reactor could be kept at a higher level, even in the case of lower benzene/ propylene mole ratio in fesh feed. This operation method results in only 1%～2% drop in cumene selectivity, but it has a very small effect on the amount of other by-products. Under the same operating conditions, however, if without any partial product recycle, the cumene selectivity was decreased by 20% and the amount of by-products was increased obviouslv.