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Method for purifying acrylic acid b utilizing azeotropic rectification

A technology of azeotropic distillation and acrylic acid, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve problems such as strong hydrogen bond strength, self-polymerization of acrylic acid, and difficulty in dehydration, so as to reduce polymerization tendency, reduce loss, The effect of extending the production cycle

Inactive Publication Date: 2004-10-13
SHANGHAI HUAYI NEW MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Difficult to dehydrate due to strong hydrogen bonds
Moreover, acrylic acid is prone to self-polymerization, resulting in a decrease in yield.

Method used

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  • Method for purifying acrylic acid b utilizing azeotropic rectification
  • Method for purifying acrylic acid b utilizing azeotropic rectification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] An acrylic acid aqueous solution containing about 48% by weight of water, 4% by weight of acetic acid, and 48% by weight of acrylic acid is introduced into the 15th tray of the light removal tower C1. The tower is equipped with 30 trays and the inner diameter of the tower is 33000mm, among which 12 co-current injection trays are used in the rectification section. A single tetrachlorethylene is used as an entrainer, and the azeotropic rectification operation of the acrylic acid aqueous solution is carried out under this condition. The feeding ratio of tetrachlorethylene solvent and acrylic acid aqueous solution is 2.7:1.

[0027] During the operation of this embodiment, the temperature at the top of C1 is 50°C, the bottom of the tower is 85°C, and the pressure at the top of the tower is 14KPA. The aqueous phase collected from pipeline 3 contains 1.29% by weight of acrylic acid, the extracted liquid from the tower kettle of pipeline 6 contains 0.09% by weight of water an...

Embodiment 2

[0029] An acrylic acid aqueous solution containing about 48% by weight of water, 4% by weight of acetic acid, and 48% by weight of acrylic acid is introduced into the 15th tray of the light removal tower C1. As the entrainer, toluene-tetrachloroethylene complex mixed solvent (combination ratio 20:1) is used, and the azeotropic rectification operation of the acrylic acid aqueous solution is carried out under this condition. The feed ratio of the compounded mixed solvent to the aqueous acrylic acid solution is 3:1.

[0030] During the operation of this example, the temperature at the top of C1 is 45°C, the bottom of the tower is 84.5°C, and the pressure at the top of the tower is 14KPA. The aqueous phase collected from pipeline 3 contains 0.51% by weight of acrylic acid, the extracted liquid from the tower reactor of pipeline 6 contains 0.07% by weight of water and 2.41% by weight of acetic acid, and the extracted liquid from the tower reactor of C2 contains 0.22% by weight of a...

Embodiment 3

[0032] An acrylic acid aqueous solution containing about 48% by weight of water, 4% by weight of acetic acid, and 48% by weight of acrylic acid is introduced into the 15th tray of the light removal tower C1. A toluene-tetrachloroethylene compounded mixed solvent (combined ratio 10:1) is used as an entrainer, and the azeotropic rectification operation of the acrylic acid aqueous solution is carried out under this condition. The feed ratio of the compounded mixed solvent to the aqueous acrylic acid solution is 2.9:1.

[0033] During the operation of this example, the temperature at the top of C1 is 45.5°C, the bottom of the tower is 84.2°C, and the pressure at the top of the tower is 14KPA. The aqueous phase collected from pipeline 3 contains 0.51% by weight of acrylic acid, the extracted liquid from the tower kettle of pipeline 6 contains 0.08% by weight of water and 2.26% by weight of acetic acid, and the extracted liquid from the tower still of C2 contains 0.20% by weight of ...

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Abstract

The present invention relates to a new method for purifying acrylic acid. It uses tetrafluoroethylene single coboiling agent or tetrafluoroethylene and aromatic hydrocarbon compounded cobiling agent, in the light-removing tower adopting parallel-flow jet tray it adopts azeotropic rectification process to remove the water and acetic acid from acrylic acid aqueous solution. Said process method has higher dewatering rate and acrylic acid removing rate and lower acrylic acid carrying-out rate.

Description

technical field [0001] The invention relates to a method for purifying an aqueous solution of acrylic acid by azeotropic distillation. 1-4 Azeotropic agent for halogenated olefins, remove water and acetic acid in acrylic acid aqueous solution by azeotropic distillation in distillation tower. The entrainer may also contain aromatic hydrocarbons to form a compound entrainer. technical background [0002] The crude acrylic acid aqueous solution prepared by propylene oxidation method, wherein the concentration of acrylic acid is 35-60% by weight, generally contains acrylic acid dimer in addition to impurities such as acetic acid, formaldehyde, acrolein, propionic acid, acetone, maleic acid and furfural and other by-products. Dehydration is difficult due to the strong hydrogen bond strength. Moreover, acrylic acid is very prone to self-polymerization, resulting in a decrease in yield. At present, methods such as solvent extraction and azeotropic dehydration are usually used i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/46C07C57/07
Inventor 邵敬铭马建学唐勇杨蓓兰张培璋赵丽吴滨瞿红齐峻
Owner SHANGHAI HUAYI NEW MATERIAL
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