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

Abstract

The invention provides a multi-effect cumene reactive distillation method combined with a heat pump, in which excess benzene and propylene are reacted in a reactive distillation tower, and unreacted benzene and products cumene and dicumene are extracted from the reactive distillation column. The bottom of the distillation tower is removed, and benzene is recovered from the top of the benzene recovery tower to the reactive distillation tower for recycling. The bottom material of the benzene recovery tower is sent to the cumene purification tower to obtain pure cumene from the top of the tower. Circulate with diisopropylbenzene to the reactive distillation tower; a heat pump is installed in the reactive distillation tower, and the steam at the top of the tower is pressurized and heated to be used as a heat source for the reactive distillation tower. At the same time, the benzene recovery tower and the cumene tower are controlled. pressure, so that the vapor at the top of the reactive distillation column can be used as the heat source for the reboilers of the two columns at the same time. The invention also provides a multi-effect cumene reactive rectification device combined with a heat pump. The present invention adopts means of combining heat pump, multi-effect rectification and reactive rectification, effectively utilizes the heat inside the system, can significantly reduce high-grade energy demand, and has remarkable energy-saving effect.

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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