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Method for producing tert-butyl ester compound by performing esterification reaction, rectification and coupling to organic carboxylic acid and isobutene

A reactive distillation and esterification reaction technology, applied in the chemical industry, can solve problems such as distillation pressure mismatch, and achieve the effects of low production cost, short process flow, and high economic benefits

Active Publication Date: 2013-02-13
NANJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the esterification reaction of isobutene and some organic carboxylic acids needs to be carried out under pressure, while the rectification is carried out under normal pressure or reduced pressure, and the pressure of the reaction and rectification does not match.
Therefore, the reactive distillation process carried out in a rectification column is not suitable for the esterification of organic carboxylic acid and isobutylene to produce tert-butyl esters

Method used

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  • Method for producing tert-butyl ester compound by performing esterification reaction, rectification and coupling to organic carboxylic acid and isobutene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] In a rectification column with an inner diameter of 1.0m and a tray number of 30 trays, two units with a volume of 5m 3 The tank reactor is connected, in which the material of the tower tank enters the first side reactor, and the outlet material of the side reactor enters the fifth tray (the number of trays is counted from bottom to top); from the sixth rectification tray The material enters the second reactor, the outlet material of the side reactor enters the 11th tray, and the material between the rectification column and the side reactor is transported by a pump.

[0029] Each side reactor is equipped with 150kg ion exchange resin catalyst (D006 type produced by Hebei Kairui Chemical Co., Ltd.). The feed flow rate of acetic acid to the first side reactor is 5 kmol / h, and the feed flow rate of isobutene to the first and second side reactors is 3.5 and 1.5 kmol / h, respectively. The esterification reaction temperature is 35°C, the pressure of each side reactor is 0.15...

Embodiment 2

[0031] In a rectification column with an inner diameter of 0.8m and a plate number of 30 trays, four units with a volume of 3m 3 The tank reactor is connected, in which the material in the tower tank enters the first side reactor, and the outlet material of the side reactor enters the first tray (the number of trays is counted from bottom to top); from the second rectification tray The material enters the second side reactor, and the material at the outlet of the side reactor enters the third tray; the material from the fourth rectification tray enters the third side reactor, and the outlet material of the side reactor enters the fifth column plate; the material from the 6th rectification tray enters the 4th side reactor, and the outlet material of the side reactor enters the 7th tray; the material between the rectification column and the side reactor is transported by a pump.

[0032]Each side reactor is equipped with 80kgY molecular sieve catalyst (Y molecular sieve produced...

Embodiment 3

[0034] In a rectification column with an inner diameter of 0.8m and a number of trays of 25 trays, three units with a volume of 3m 3 The tank reactor is connected, in which the material in the tower tank enters the first side reactor, and the outlet material of the side reactor enters the second tray (the number of trays is counted from bottom to top); from the third rectification tray The material enters the second side reactor, and the material at the outlet of the side reactor enters the fifth tray; the material from the sixth rectification tray enters the third side reactor, and the outlet material of the side reactor enters the eighth column The materials between the plates, rectification column and side reactors are pumped.

[0035] Each side reactor is equipped with 100kg HZSM-5 molecular sieve catalyst (the HZSM-5 molecular sieve produced by Nankai University Chemical Plant, with a silicon-aluminum ratio of 38). The feed flow rate of chloroacetic acid to the first sid...

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Abstract

The invention discloses a method for producing tert-butyl ester compound by performing esterification reaction, rectification and coupling to organic carboxylic acid and isobutene. The method comprises the steps that organic acid and isobutene are continuously fed into a reaction and rectification device according to certain ratio, which is formed by coupling a side reactor and a rectification column; material enters the rectification column after reaction and then enters a side reactor at the nest stage to be conducted to esterification reaction; and the operation pressure of the rectification column is controlled to be 0.002 to 0.1 MPa in a continuous and stable operation condition. The esterification reaction temperature is 20 to 80 DEG C, and the reaction pressure is 0.1 to 1.0 MPa. The method has the advantages that the process is short, operation conditions of the side reactor and the rectification column are separated, the side reactor and the rectification column are flexible to control, the reaction conversion rate and the selectivity are high, and the mass fraction of tert-butyl ester continuously discharged from the top of the rectification column is more than 99 percent.

Description

technical field [0001] The invention belongs to the field of chemical industry, and relates to a method for producing tert-butyl ester compounds by coupling organic carboxylic acid and isobutylene esterification reaction rectification. Background technique [0002] Tert-butyl ester compounds have some special properties due to the tert-butyl group with large steric hindrance effect. For example, tert-butyl acetate has excellent solubility, suitable evaporation rate, medium flash point and excellent cleaning efficiency. It is a kind of Low toxicity, environmentally friendly solvent; tert-butyl acrylate has excellent photostability due to its unique and highly active unsaturated double bond and tert-butyl group, which is obtained by self-polymerization or copolymerization with other monomers , weather resistance, water resistance, oil resistance, chemical resistance and other good chemical and physical properties, so it has a wide range of applications in coatings, leather, pa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C67/04C07C67/54C07C69/14C07C69/54C07C69/65C07C69/24
Inventor 乔旭汤吉海李聪齐敏陈明崔咪芬陈献生迎夏
Owner NANJING UNIV OF TECH
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