Multi-effect cumene reactive distillation device and method combined with heat pump

Abstract

The invention provides a multiple-effect cumene reactive distillation method combined with a heat pump, the method comprises the following steps: reacting excessive benzene with propylene in a reactive distillation tower, removing unreacted benzene and products cumene and diisopropylbenzene from the bottom of the reactive distillation tower, recovering benzene from the top of a benzene recovery tower to the reactive distillation tower for recycling, feeding a material at the bottom of the benzene recovery tower into an isopropylbenzene purification tower, obtaining a pure product of isopropylbenzene from the tower top, and circulating isopropylbenzene and diisopropylbenzene at the tower bottom to the reactive distillation tower; a heat pump is arranged in the reactive distillation tower, part of steam at the top of the tower is pressurized and heated to serve as a heat source to be supplied to the reactor of the reactive distillation tower, meanwhile, the pressure of the benzene recovery tower and the isopropylbenzene tower is controlled so that the steam at the top of the reactive distillation tower can serve as a heat source of two reboilers. The invention also provides a multi-effect cumene reactive distillation device combined with the heat pump. The heat pump, multi-effect rectification and reactive rectification are combined, heat in the system is effectively utilized, the requirement for high-grade energy can be remarkably reduced, and the energy-saving effect is remarkable.

Description

Technical field: [0001] The invention belongs to the technical field of organic chemical industry, and in particular relates to a multi-effect cumene reactive distillation device and method combined with a heat pump. Background technique: [0002] Cumene is an important raw material for the production of phenol and co-production of acetone. Phenol and acetone have a wide range of industrial applications in materials, medicine and other industries. Cumene is also used in the production of acetophenone and synthetic monomers for rubber and resins, as well as in paints and high-octane aviation fuel components. [0003] At present, the industrial preparation method of cumene is mainly the alkylation reaction of benzene and propylene. The method follows the rule of electrophilic substitution reaction, therefore, the produced cumene can continue to react with propylene to generate polycumene. The catalysts used in the production of cumene mainly include aluminum trichloride, sol...

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Problems solved by technology

However, although the reaction heat of this process is utilized, the energy consumption of the system is still a non-negligible problem.

In research workers Junqueira ("Chemical Engineering Processing: Process Intensification", 2018, volume 130, pages 309-325), Dai Chengna (Beijing University of Chemical Technology, doctoral dissertation, 2013), etc. published about cumene In the results of different processes, we found that compared with the fixed bed reactor process of liquid phase molecular sieve, the energy saving advantage of reactive distillation process is not outstanding

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