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Method for purifying acetone from waste residue and waste water produced in ketene dimmer production process

A production process and technology of diketene, which are applied in the separation/purification of carboxylic acid compounds, the separation/purification of carbonyl compounds, and the preparation of carbonyl compounds by hydrolysis, can solve the problems of low purity and low yield of recovered acetone, and achieve increased output and savings The effect of increasing production cost and content

Inactive Publication Date: 2015-12-02
ANHUI JINGHE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the defects of low yield and low purity of recovered acetone in the prior art, the present invention provides a method for purifying acetone from the waste residue and waste water produced in the production process of diketene, which not only increases the output, but also increases the product content and saves production costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Put 800kg of acetic acid with a content of 46% into the hydrolysis kettle, then heat up the hydrolysis kettle, and control the steam pressure at about 0.2MPa. When you see reflux acetic acid in the reflux mirror (temperature 80°C-95°C), turn off the steam and start Slowly add the residue diluent (about 1.8t) dropwise. During the dropwise addition, the pressure of the hydrolysis tank is controlled at 2-5KPa, and the dropwise addition time is controlled at about 2h. After the dropwise addition, keep warm for 30-60 minutes, and keep the kettle temperature at 90-95°C to make it fully react. Gas phase through 50m 2 The vertical heat exchanger cools down to 56-65 ℃, and then passes through 40m 2 The plate is cooled by shallow cold brine to condense the acetone, and the liquid acetone is separated by the gas-liquid separator and sent to the crude acetone tank. The production time of each kettle is about 8 hours, and the production content of about 65% is about 2 tons of acet...

Embodiment 2

[0016] Put 900kg of acetic acid with a content of 45%-50% into the hydrolysis kettle, then heat up the hydrolysis kettle, and control the steam pressure at about 0.2MPa. When you see reflux acetic acid in the reflux mirror (temperature 80°C-95°C), close the Steam, began to slowly drop the residue dilution (about 2t). During the dropwise addition, the pressure of the hydrolysis tank is controlled at 2-5KPa, and the dropwise addition time is controlled at about 2h. After the dropwise addition, keep warm for 30-60 minutes, and keep the kettle temperature at 90-95°C to make it fully react. Gas phase through 50m 2 The vertical heat exchanger cools down to 56-65 ℃, and then passes through 40m 2 The plate is cooled by shallow cold brine to condense the acetone, and the liquid acetone is separated by the gas-liquid separator and sent to the crude acetone tank. The production time of each kettle is about 8 hours, and the yield of acetone with a content of about 65% is about 2.2 tons....

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PUM

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Abstract

The invention discloses a method for purifying acetone from a waste residue and waste water produced in the ketene dimmer production process. The waste residue is residue diluent, and waste water is concentrated waste water. The method is characterized by comprising three steps that firstly, the residue diluent and dilute acid react to generate acetone; secondly, acetone is recycled from the concentrated waste water; thirdly, the acetone obtained in the first step and the acetone obtained in the second step are mixed for rectification and purification. By the adoption of the method for acetone recycling and purification, the yield can be increased, the content is significantly improved, the additional value is greatly increased, part of the acetic acid in acetone sold externally can be recycled, and the ketene dimmer production cost is effectively saved.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and relates to a continuous production process for producing acetone by using waste residue and dilute acid produced in the production process of diketene, and recovering the residual acetone in waste water for final purification to obtain finished acetone. Background technique [0002] When domestic diketene manufacturers process residues, they simply react with residue diluent and acid to generate acetone. Such acetone content is not only low in output, but also low in content. At the same time, a certain amount of acetone remains in the discharged acidic concentrated wastewater. Acetone, not only causes certain economic losses, but also increases environmental pollution and increases waste water treatment costs. Contents of the invention [0003] Aiming at the defects of low yield and low purity of recovered acetone in the prior art, the present invention provides a method for puri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C45/42C07C45/82C07C49/08C07C51/42C07C53/08
CPCC07C45/42C07C45/82C07C51/42C07C49/08C07C53/08
Inventor 田家民徐成刚
Owner ANHUI JINGHE IND
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