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Energy integration method for producing benzyl chloride through series connection of two stages of reactive distillation

A technology of reactive distillation column and benzyl chloride is applied in the field of energy integration of two-stage reactive distillation series production of benzyl chloride, which can solve problems such as insufficient energy utilization, and achieve lower thermal energy grade, lower energy consumption, and reduced circulating cooling. water effect

Active Publication Date: 2015-07-15
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to aim at the defect of insufficient energy utilization in the existing single-tower reactive distillation process, and to provide a series production of benzyl chloride using a two-stage reactive distillation column with side reactors and a benzyl chloride refining distillation column Methods

Method used

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  • Energy integration method for producing benzyl chloride through series connection of two stages of reactive distillation
  • Energy integration method for producing benzyl chloride through series connection of two stages of reactive distillation
  • Energy integration method for producing benzyl chloride through series connection of two stages of reactive distillation

Examples

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Effect test

Embodiment 1

[0024] The first reactive distillation column with 8 trays and a volume of 2.0m 3 The tank reactor is connected, wherein the outlet material of the top condenser of the rectification tower enters the side reactor (that is, the above-mentioned volume is 2.0m 3 The tank reactor) returns to the second tray after reacting with chlorine. The second reactive distillation column with 10 trays and a volume of 5.0m 3 The tank reactor is connected, wherein the outlet material of the top condenser of the rectification tower enters the side reactor (that is, the volume is 5.0m 3 The tank reactor) reacts with chlorine and returns to the second tray; the material in the second reaction distillation column is pumped to the eighth column of the third benzyl chloride refining distillation column through the feed pump board. The number of trays of the third benzyl chloride refining distillation column is 16.

[0025] Fresh toluene is pre-chlorinated to toluene mole fraction in pre-chlorinat...

Embodiment 2

[0030] The first reactive distillation column with 8 trays, and the two volumes are 2.0m 3 and 1.0m 3 The tank-type side reactor is connected, and the outlet material of the top condenser of the rectification tower enters the first side reactor to react with chlorine gas and then returns to the second tray; the third tray of the rectification tower uses all materials After exiting, it enters the second side reactor to react with chlorine gas and then returns to the fourth tray. The second reactive distillation column with 10 trays, and two volumes of 4.0m 3 and 3.0m 3 The tank-type side reactor is connected, and the outlet material of the top condenser of the rectification tower enters the first side reactor to react with chlorine gas and then returns to the second tray; the third tray of the rectification tower uses all materials After exiting, it enters the second side reactor to react with chlorine gas and then returns to the fourth tray; the material in the second react...

Embodiment 3

[0035] The first reactive distillation column with 8 trays, and the two volumes are 2.0m 3 The tank-type side reactor is connected, and the outlet material of the top condenser of the rectification tower enters the first side reactor to react with chlorine gas and then returns to the second tray; the third tray of the rectification tower uses all materials After exiting, it enters the second side reactor to react with chlorine gas and then returns to the fourth tray. The second reactive distillation column with 10 trays, and the three volumes are all 3.0m 3 The tank-type side reactor is connected, and the outlet material of the top condenser of the rectification tower enters the first side reactor to react with chlorine gas and then returns to the second tray; the third tray of the rectification tower uses all materials After exiting, it enters the second side reactor to react with chlorine gas and then returns to the fourth tray; after all the materials on the fifth tray of ...

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Abstract

The invention discloses an energy integration method for producing benzyl chloride through the series connection of two stages of reactive distillation. According to the energy integration method, methylbenzene prechlorination, the two stages of methylbenzene-chlorination reactive distillation and benzyl chloride refining are connected in series to form the benzyl chloride production process. According to a system, a benzyl chloride vapor-phase material on the top of a benzyl chloride refining and rectifying column is not cooled by circulating water, the benzyl chloride vapor-phase material is used as a heating source of a tower kettle reboiler of a first reactive distillation column, and the benzyl chloride vapor-phase material is condensed into liquid when a material in the first reactive distillation column is vaporized. According to the reactive distillation integration process with the two reactive distillation columns connected in series, operating conditions of the reactive distillation column are independent and are convenient to control; the high-selectivity benzyl chloride can be produced, the yield of the benzyl chloride reaches more than 97.5 percent, and the purity of the benzyl chloride can reach 99.5 percent; energy consumption in the benzyl chloride production process is reduced by 25 percent through energy integration.

Description

technical field [0001] The invention relates to an energy integration method for producing benzyl chloride in series by two-stage reactive distillation. Specifically, it relates to an energy-integrated method for producing benzyl chloride by using a two-stage series-connected reactive distillation integrated device and a benzyl chloride refining distillation column in series. Background technique [0002] Benzyl chloride is an important organic chemical raw material, widely used in medicine, pesticides, spices, dyes, solvents, additives, plasticizers, surfactants, etc., and can be used to produce benzyl alcohol, phenylacetonitrile, phenylacetic acid, Formyl chloride, benzaldehyde, and other benzyl-containing compounds. [0003] The production of benzyl chloride mainly adopts toluene light (or heat) catalytic chlorination process. The chlorination of toluene to generate benzyl chloride is a series of reaction processes. The use of reactive distillation integrated technology...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C22/04C07C17/14C07C17/383
CPCY02P20/10
Inventor 汤吉海乔旭孙玉玉崔咪芬陈献费兆阳
Owner NANJING TECH UNIV
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