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Method for purifying acetic acid from acetic acid wastewater

A technology for acetic acid and wastewater, applied in the separation/purification of carboxylic acid compounds, organic chemistry, etc., can solve the problems of large investment in equipment, generation of secondary wastewater, environmental pollution, etc., to reduce energy costs, equipment investment, and environmental protection friendly effect

Inactive Publication Date: 2015-03-25
ZHEJIANG NHU PHARMA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] For the above-mentioned technical problem of prior art, the purpose of this invention is to provide a kind of method for purifying acetic acid from acetic acid waste water, this method solves the problem of large energy consumption, large equipment investment, incomplete separation of acetic acid and water, and the possibility of secondary Secondary wastewater, environmental pollution, etc. technical issues

Method used

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  • Method for purifying acetic acid from acetic acid wastewater
  • Method for purifying acetic acid from acetic acid wastewater
  • Method for purifying acetic acid from acetic acid wastewater

Examples

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Effect test

Embodiment 1

[0030] Such as figure 1 Shown, the present invention purifies the method for acetic acid from acetic acid waste water, comprises the following steps:

[0031] (1) The acetic acid wastewater containing 45% acetic acid enters the tower through the first line 1 from the middle and lower part of the acid-water separation tower. The upper middle part of the acid-water separation tower enters the tower, and the acetic acid wastewater and dimethylformamide undergo extraction and rectification reactions in the acid-water separation tower;

[0032] (2) After being cooled by the condenser 9, the gas phase flow at the top of the acid-water separation tower is returned to the acid-water separation tower through the seventh line 7, and the waste water stream is extracted through the third line 3; the liquid phase obtained by the acid-water separation tower The stream enters the tower from the middle part of the acetic acid vacuum rectification tower through the fourth line 4 and rectifies...

Embodiment 2

[0037] Such as figure 1 Shown, the present invention purifies the method for acetic acid from acetic acid waste water, comprises the following steps:

[0038] (1) The acetic acid waste water containing 54% acetic acid enters the tower from the middle and lower part of the acid-water separation tower through the first line 1, and at the same time, the extraction agent sulfolane passes through the second line 2 from the acid-water separation tower from the high-position transfer tank 10 The upper part of the middle part enters the tower, and the acetic acid waste water and sulfolane carry out the reaction of extraction and rectification in the acid-water separation tower;

[0039] (2) After being cooled by the condenser 9, the gas phase flow at the top of the acid-water separation tower is returned to the acid-water separation tower through the seventh line 7, and the waste water stream is extracted through the third line 3; the liquid phase obtained by the acid-water separation...

Embodiment 3

[0044] Such as figure 1 Shown, the present invention purifies the method for acetic acid from acetic acid waste water, comprises the following steps:

[0045](1) Enter the acetic acid waste water containing 50% acetic acid into the tower through the first line 1 from the middle and lower part of the acid-water separation tower. At the same time, the mixture of the extractant N-methylacetamide and N-formylmorpholine is The high-level transfer tank 10 enters the tower from the upper middle part of the acid-water separation tower through the second line 2, and the acetic acid waste water and the extractant carry out the reaction of extractive distillation in the acid-water separation tower;

[0046] (2) After being cooled by the condenser 9, the gas phase flow at the top of the acid-water separation tower is returned to the acid-water separation tower through the seventh line 7, and the waste water stream is extracted through the third line 3; the liquid phase obtained by the aci...

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Abstract

The invention relates to a method for purifying acetic acid from acetic acid wastewater, and adopts a wastewater treatment process for treating acetic acid wastewater with medium-low concentration. According to the method, acetic acid in the acetic acid wastewater is brought into an extraction agent in an extractive distillation mode, and moisture is evaporated out of a tower top; and then a reduced pressure distillation tower is used for separating acetic acid and the extraction agent, and a qualified finished acetic acid product is obtained. The method is suitable for treating acetic acid wastewater with medium-low concentration, preferably, the appropriate extraction agent is adopted, so that relatively, the energy consumption cost for wastewater treatment is lower, equipment investment is low, the acid and water separation effect is good, and the method is more environment-friendly.

Description

technical field [0001] The invention relates to a method for purifying medium and low concentration acetic acid wastewater, belonging to the technical field of three wastes treatment. Background technique [0002] Acetic acid is an important basic chemical raw material. It is used in the production process of furfural, paper making and acetic acid, and is widely used in the chemical industry. Purify acetic acid from medium and low concentration acetic acid wastewater, eliminate the discharge of acetic acid wastewater, and improve the utilization efficiency of acetic acid raw materials. The environment is very friendly and has extremely high economic benefits. [0003] Acetic acid and water do not form an azeotrope, so ordinary distillation can be used. But under normal pressure, because the non-ideality of acetic acid is particularly strong, association takes place easily, so the relative volatility of acetic acid and water is close to 1, and the number of required theoret...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C51/44C07C53/08
CPCC07C51/44C07C53/08
Inventor 张莉平吕国锋潘洪胡鹏翔赵江黄国东盛壹栋陈梦桥王伟白杨
Owner ZHEJIANG NHU PHARMA
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