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Method for extracting acetic acid in salt-containing acetic acid aqueous solution by one-sided line heat integration azeotropic rectification method

A technology of acetic acid aqueous solution and azeotropic distillation, which is applied in the technical field of chemical heat transfer and separation, can solve the problems of large energy consumption and consumption, and achieve the effects of reducing investment and occupying space, simplifying the process and simplifying the production process

Active Publication Date: 2015-08-19
NANJING NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the above method to extract acetic acid in the aqueous solution of saline acetic acid, the content of acetic acid reaches more than 97%, and the yield at one time reaches 96.1%, but a large amount of energy is consumed due to twice heating and condensation

Method used

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  • Method for extracting acetic acid in salt-containing acetic acid aqueous solution by one-sided line heat integration azeotropic rectification method
  • Method for extracting acetic acid in salt-containing acetic acid aqueous solution by one-sided line heat integration azeotropic rectification method
  • Method for extracting acetic acid in salt-containing acetic acid aqueous solution by one-sided line heat integration azeotropic rectification method

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Embodiment 1

[0021] According to the single-side line azeotropic heat integrated rectification method of the present invention extracts the method for acetic acid in the saline acetic acid aqueous solution, technological process is as follows figure 1 As shown, the single-side line heat integrated azeotropic distillation device is mainly composed of a salt reduction chamber 1, a tower kettle 2, a feed section 3, a side line discharge section 4, an azeotropic distillation column 5, a top condenser 6, a liquid-liquid It is composed of stratified tank 7 and side line condenser 8. The main streams involved in the process flow include raw material saline acetic acid aqueous solution 9, raw material 10 after preheating at the top of single side line azeotropic rectification tower, and steam 11 at the top of single side line azeotropic rectification tower , single side line azeotropic distillation tower top condensate 12, single side line azeotropic distillation tower top discharge 13, raw materi...

Embodiment 2

[0035] According to the same method and process as in Example 1, extract acetic acid in the saline acetic acid aqueous solution, the weight percentage of raw materials is composed of 30-35% acetic acid, 52-58% water and 10-15% salt, select single side line azeotropic rectification The number of trays of the tower is N=65-75, and the reflux ratio is controlled at 2-3:1, so that the aqueous phase of the tower top discharge contains about 0.2-0.4% acetic acid, and the acetic acid content of the side stream discharge reaches more than 97%.

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Abstract

A method for extracting acetic acid in a salt-containing acetic acid aqueous solution by a one-sided line heat integration azeotropic rectification method is provided. The method is characterized in that, a raw material salt-containing acetic acid aqueous solution enters a rectifying still of a one-sided line azeotropic rectifying tower after being pre-heated by an overhead condenser and a side line condenser; an azeotropic agent, which is a mixed solution of cyclohexane and n-butyl acetate, is added to the one-sided line azeotropic rectifying tower from the top of the tower; after azeotropic rectification and separation, overhead steam is condensed in the overhead condenser, and then is layered in a liquid-liquid layering tank; a water phase is extracted, and an organic phase flows back to the one-sided line azeotropic rectifying tower; after a side line discharged material is condensed in the side line condenser, acetic acid is extracted; and a salt reducing chamber is disposed under the rectifying still, and a salt-containing solution is discharged. Under conditions that a proportion of cyclohexane to n-butyl acetate in the azeotropic agent is 1: 1, an overhead reflux ratio is controlled to be 2.5: 1, top temperature is 89.5 to 90.7 DEG C, temperature of a side line discharge hole is 117.3 to 118.1 DEG C, and bottom temperature is 123.4 to 125.7, content of acetic acid reaches more than 97%, yield reaches more than 98.0%, and energy consumption can be saved by about 53% compared with an azeotropic rectification and rectification combination method.

Description

technical field [0001] The invention relates to a chemical heat transfer and separation process, in particular to a method for extracting acetic acid in a saline acetic acid aqueous solution by a one-side line heat integration azeotropic distillation method. Background technique [0002] Acetic acid is one of the most important organic acids. It is mainly used in the production of vinyl acetate, acetic anhydride, acetate and cellulose acetate. Polyvinyl acetate can be used to prepare films and adhesives, and is also a raw material for synthetic fiber vinylon; acetate is an excellent solvent, widely used in pesticides, medicines and dyes, photographic medicine manufacturing, fabric printing and dyeing, and rubber industries; acetic acid It can also be used to synthesize acetic anhydride, diethyl malonate, ethyl acetoacetate, haloacetic acid, etc. It can also be used to manufacture drugs such as aspirin, and it can also be used to produce acetate, etc. Salt-containing acetic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C53/08C07C51/46
CPCC07C51/46C07C53/08
Inventor 顾正桂黄鑫孙昊
Owner NANJING NORMAL UNIVERSITY
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