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

A technology of reactive distillation and reactive distillation column, which is applied in the field of multi-effect cumene reactive distillation equipment, can solve the problems of the reactive distillation process not having prominent energy-saving advantages and the system energy consumption being non-negligible, etc.

Active Publication Date: 2021-09-14
NANJING INST OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

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Embodiment 1

[0032] refer to figure 1, the embodiment of the present invention provides a multi-effect cumene reactive distillation device combined with a heat pump, including a heat pump reactive distillation device, a benzene recovery device and a cumene purification device;

[0033] The heat pump reactive distillation device comprises a reactive distillation tower 1, a preheater 2, a compressor 3, a reactive distillation tower condenser 6 and a reactive distillation tower reboiler 4; the reactive distillation tower 1 is provided with A feed inlet and a feed outlet, the feed inlet includes a benzene feed inlet and a propylene feed inlet, the benzene feed inlet is arranged at the top of the reactive distillation tower 1, and the propylene feed inlet is arranged at the reactive distillation tower 1 The middle part; the reactive distillation tower 1 is connected to the benzene recovery device through the discharge port; the top of the reactive distillation tower 1 is provided with a steam o...

Embodiment 2

[0053] The device structure and method of this embodiment are roughly the same as those of Embodiment 1. The difference is:

[0054] Reactive distillation column 1: The operating pressure is 7 bar, fresh benzene is mixed with recycled benzene, the feed flow rate is 150 kmol / h, the material from the bottom of cumene purification column 11 is 10 kmol / h, and benzene enters the first tray together , the temperature at the top of the tower is 160.3°C, and the temperature at the bottom of the tower is 204.3°C.

[0055] Benzene recovery tower 7: the operating pressure is 0.37 bar, the output at the top of the tower is 50 kmol / h, the temperature at the top of the tower is 50.1°C, the temperature at the bottom of the tower is 119.5°C, and the distillate at the top of the tower is sent to the reactive distillation tower 1 through pump 16 The first tray.

[0056] Cumene purification tower 11: the operating pressure is 0.2 bar, the output at the bottom of the tower is 10 kmol / h, the tem...

Embodiment 3

[0061] The device structure and method of this embodiment are roughly the same as those of Embodiment 1. The difference is:

[0062] Reactive distillation column 1: The reactive distillation column 1 used has a total of 23 plates, the number of plates in the reactive distillation area is 11, the number of plates in the rectification separation area is 12, and the benzene feed position is the first column The propylene feed position is the 11th tray, the operating pressure of the reactive distillation column 1 is 8 bar, the temperature at the top of the column is 167.0°C, and the temperature at the bottom of the column is 188.2°C.

[0063] The flow rate of fresh propylene is 80kmol / h, fresh benzene is mixed with recycled benzene, the feed flow rate is 230kmol / h, and the material 5kmol / h from the bottom of the cumene purification tower enters the first tray together with benzene.

[0064] Benzene recovery tower 7: the operating pressure is 0.35 bar, the number of trays is 21, t...

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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...

Claims

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Application Information

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IPC IPC(8): B01D3/00B01D3/14B01D3/32B01J19/00B01J19/24C07C2/64C07C15/085C07C7/04
CPCB01D3/009B01D3/14B01D3/32B01J19/0053B01J19/24C07C2/64C07C7/04C07C15/085Y02P20/10Y02P20/50Y02P70/10
Inventor 丁良辉杨国峰薛云波徐威胡丽华渠吉发
Owner NANJING INST OF TECH
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