Method for improving conversion rate in production of iminodisuccinate

A technology of iminodisuccinate and conversion rate, applied in chemical instruments and methods, carboxylate preparation, carboxylate preparation and other directions, can solve problems such as unsatisfactory results and unsatisfactory results, and achieve high conversion rate , the effect of prolonging the reaction time and low content of by-products

Inactive Publication Date: 2020-07-10
HEBEI XIETONG ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Despite the adoption of the above technologies, the results are still unsatisfactory, and the conversion rate generally does not exceed 8

Method used

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  • Method for improving conversion rate in production of iminodisuccinate
  • Method for improving conversion rate in production of iminodisuccinate
  • Method for improving conversion rate in production of iminodisuccinate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 360ml of water in a 1L four-neck flask, start stirring, then add 147g of maleic anhydride, and make maleic anhydride and water carry out hydrolysis reaction to generate maleic acid.

[0035] After the hydrolysis of maleic anhydride is complete, slowly add 233g of solid sodium hydroxide in batches to convert maleic acid into maleic acid salt. This process exotherms strongly, and cooling is required to control the temperature not to exceed 80°C to prevent bumping.

[0036] Then add 210 g of aspartic acid in batches and stir to dissolve completely.

[0037] The molar ratio of maleate to aspartate is 1:1.05, the solid content is about 58%, and the pH value of 1% diluent is 11.46 at room temperature.

[0038] Next, control the reaction temperature at 90±1°C, and regularly take samples to monitor the conversion rate. The data are as follows:

[0039] The highest conversion rate is at 96 hours, and the sample is diluted to about 40% solid content, which is a transparent...

Embodiment 2

[0041] Add 360ml of water in a 1L four-neck flask, start stirring, then add 147g of maleic anhydride, and make maleic anhydride and water carry out hydrolysis reaction to generate maleic acid.

[0042] After the maleic anhydride is completely hydrolyzed, slowly add 222g of solid sodium hydroxide in batches to convert the maleic acid into maleate. This process is exothermic and requires cooling to control the temperature not to exceed 80°C to prevent bumping.

[0043] Then add 210 g of aspartic acid in batches and stir to dissolve completely.

[0044] The molar ratio of maleate to aspartate is 1:1.05, the solid content is about 57%, and the pH value of 1% diluent is 10.68 at room temperature.

[0045] Next, control the reaction temperature at 90±1°C, and regularly take samples to monitor the conversion rate. The data are as follows:

[0046]

[0047] The highest conversion rate was 85.23% in 96 hours, and the sample was diluted to about 40% solid content, which was a transp...

Embodiment 3

[0050] Add 360ml of water in a 1L four-neck flask, start stirring, then add 147g of maleic anhydride, and make maleic anhydride and water carry out hydrolysis reaction to generate maleic acid.

[0051] After the maleic anhydride is completely hydrolyzed, slowly add 222g of solid sodium hydroxide in batches to convert the maleic acid into maleate. This process is exothermic and requires cooling to control the temperature not to exceed 80°C to prevent bumping.

[0052] Then add 210 g of aspartic acid in batches and stir to dissolve completely.

[0053] The molar ratio of maleate to aspartate is 1:1.05, the solid content is about 57%, and the pH value of 1% diluent is 10.68 at room temperature.

[0054] Next, control the reaction temperature at 85±1°C, and regularly take samples to monitor the conversion rate. The data are as follows:

[0055]

[0056] The highest conversion rate was 87.89% in 120 hours. The sample was diluted to about 40% solid content, which was a transpare...

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Abstract

The invention relates to a method for improving conversion rate in production of iminodisuccinate, and belongs to the technical field of organic compound production. Higher conversion rate is obtainedthrough high pH value, lower temperature and prolonged reaction time under high concentration. The method is high in conversion rate, and the conversion rate detected by a complex copper developing method is generally not lower than 85%; the content of by-products is low, and the content of fumaric acid is reduced to 5% or below from 7% (in pure solid) of a common process.

Description

technical field [0001] The invention relates to a method for improving conversion rate in the production of iminodisuccinate, belonging to the technical field of organic compound production. Background technique [0002] Tetrasodium iminodisuccinate is a new generation of green chelating agent, abbreviated as IDS in English. At present, the raw materials commonly used are maleic acid, aspartic acid and its salts. This process is more efficient than the original maleic anhydride ammoniation process. Safety and environmental protection. Due to the limitation of organic reaction balance, there are inevitably reactant residues (such as aspartic acid, maleic acid) and by-products (such as fumaric acid, malic acid, etc.) in the reaction process, and the conversion rate is difficult to increase. [0003] The reaction conditions mentioned in domestic patent CN104447370 are pH 9-12; reaction temperature above 65°C to boiling reflux, preferably above 95°C; reaction time within 30 hou...

Claims

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Application Information

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IPC IPC(8): C07C227/18C07C229/24C07C51/087C07C51/41C07C57/145
CPCC07C227/18C07C51/087C07C51/412C07C57/145C07C229/24
Inventor 焦永康李文曦
Owner HEBEI XIETONG ENVIRONMENTAL PROTECTION TECH CO LTD
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