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A method for recovering methyl acetate from aspartame production wastewater

A technology for producing waste water and methyl acetate, applied in the fields of waste water treatment and industrial waste water treatment, can solve the problems of environmental pollution, loss of methanol, and difficulty in waste water, and achieve the effects of reducing environmental pollution, easy operation and high recovery rate

Active Publication Date: 2016-03-02
江苏维多股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the production of aspartame, methanol, hydrochloric acid and acetic acid remain in part of the waste water. It is difficult to directly treat the waste water, and methanol is lost.
The prior art proposes some recovery and treatment methods for salt amino acids in aspartame production wastewater, but there is no recovery and treatment method for methanol and acetic acid
This not only pollutes the environment, but also wastes effective resources and increases production costs, which is not in line with the environmental protection purpose of energy saving and emission reduction.

Method used

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  • A method for recovering methyl acetate from aspartame production wastewater
  • A method for recovering methyl acetate from aspartame production wastewater
  • A method for recovering methyl acetate from aspartame production wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Take aspartame production wastewater 1.5m 3(hydrochloric acid content 12%, acetic acid content 4%, methanol content 5%) add steam heating at the bottom of the tower 12 as the bottom liquid, when the tower still temperature rises to 80 ℃, methyl alcohol enters reaction from tower first layer distributor 8, methanol The middle is extracted from the distributor 10 of the third layer of the tower, and then refluxed into the reaction. Methyl acetate is extracted from the tower top 11, and the raffinate is extracted from the bottom 12 of the tower. Atmospheric pressure distillation, control tower reflux ratio 4 / 1.

[0051] During the feed (aspartame production wastewater) volume 20m 3 , methanol feed rate 1.5m 3 , recovery of methyl acetate 2.3m 3 , The content of acetic acid in the residual liquid at the bottom of the tower is about 1%. However, the methanol content in the methyl acetate extracted from the tower top 11 is high.

[0052]

Embodiment 2

[0054] Take aspartame production wastewater 1.5m 3 (hydrochloric acid content 12%, acetic acid content 4%, methanol content 5%) add tower bottom 12 as bottom liquid, turn on steam heating, when tower still temperature rises to 80 ℃, methyl alcohol enters reaction from tower first layer distributor 8, Methanol is withdrawn from the distributor 10 in the third layer of the tower, and then refluxed into the reaction. Methyl acetate is extracted from the tower top 11, and the raffinate is extracted from the bottom 12 of the tower. The control tower reflux ratio is 6 / 1.

[0055] During the feed volume 20m 3 , methanol feed rate 1.5m 3 , recovery of methyl acetate 1.5m 3 , The content of acetic acid in the residual liquid at the bottom of the tower 12 is about 0.5%. The methanol content in the extracted methyl acetate is small. Control the methanol content in the top 11 methyl acetate—it can be seen from experiments that the methanol content in the top 11 is about 1.5% when th...

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Abstract

The invention provides a method for recovering methyl acetate from aspartame production wastewater. The method comprises the following steps of (1) adding part of aspartame production wastewater as a base solution to the bottom of a rectification tower provided with three layers of distributors, heating and regulating the temperature; (2) adding methanol from the first layer of distributor, namely, the bottommost layer of distributor of the rectification tower, adding the aspartame production wastewater from the second layer of distributor of the rectification tower, and heating for rectification reaction; (3) extracting the superfluous methanol in reaction from the third layer of distributor of the rectification tower, wherein part of the superfluous methanol returns to the first layer of distributor to continue to participate in reaction, and the other part of superfluous methanol is directly extracted and collected; (4) extracting methyl acetate from the top of the tower to a receiving tank, extracting superfluous aspartame production wastewater in reaction from the bottom of the tower, and then, returning the extracted superfluous aspartame production wastewater used as the base solution to the bottom of the rectification tower to continue to participate in reaction. By using the method for recovering methyl acetate from aspartame production wastewater, provided by the invention, effective components can be recycled, the recycle rate is high, and the environment pollution is relieved.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for recovering methyl acetate from aspartame production wastewater, and belongs to the field of industrial wastewater treatment. Background technique [0002] Aspartame (Aspartame, C 14 h 18 N 2 o 5 ), the chemical name is L-aspartame-L-phenylalanine methyl ester (APM=L-aspartyl-L-phenylalaninemethylester), which is a non-carbohydrate artificial sweetener, and its food additive international code Yes: E951. [0003] Aspartame is also known as sweetener, protein sugar, aspartame, aspartame, aspartame, etc. Aspartame is a white crystalline powder with a refreshing sweetness, and its sweetness is 180-200 times that of sucrose. Compared with synthetic sweeteners such as saccharin, cyclamate, and AK sugar, it has the advantages of good taste, high safety, and low calories, making it popular in the European and American markets in the 1980s, and is widely used in food, b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/14C07C67/08C07C67/54
CPCC07C67/08C07C67/54C07C69/14
Inventor 罗春龙杨小锋鲁光贵
Owner 江苏维多股份有限公司
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