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Method for preparing diethylenetriaminepentaacetic acid

A technology of diethylenetriaminepentaacetic acid and chloroacetic acid, which is applied to the preparation of organic compounds, chemical instruments and methods, and cyanide reaction preparation, etc., can solve the problem of hindering the localization process of color kit products, complex production methods, unfavorable production methods, etc. Problems such as popularization and use, to achieve the effect of low cost, shortened developing time, and enhanced fixing effect

Inactive Publication Date: 2009-12-23
TIANJIN CHEM REAGENT RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, domestic diethylenetriaminepentaacetic acid mostly relies on imports, and its production method is complicated and costly, so it is not conducive to domestic promotion and use, and hinders the localization process of color kit products

Method used

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  • Method for preparing diethylenetriaminepentaacetic acid

Examples

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Comparison scheme
Effect test

Embodiment 1

[0026] A kind of preparation method of diethylenetriamine pentaacetic acid, this preparation method comprises the following steps:

[0027] (1). Salt forming steps:

[0028] Dissolve 30 mol of monochloroacetic acid in water and fully stir to form a monochloroacetic acid aqueous solution, dissolve 67 mol of sodium hydroxide in water and fully stir to form an aqueous solution of sodium hydroxide. Cool the prepared monochloroacetic acid aqueous solution and sodium hydroxide aqueous solution with ice water for later use. Put ice water into the interlayer of the reaction kettle to cool the reaction kettle, then add an aqueous solution of chloroacetic acid, slowly add aqueous sodium hydroxide solution dropwise under stirring, and control the temperature of the reaction system by feeding ice water or water into the interlayer of the reaction kettle during the reaction. At 24°C, when the measured pH value is 10, the dropwise addition is completed, the salt-forming reaction is complet...

Embodiment 2

[0038] A kind of preparation method of diethylenetriamine pentaacetic acid, this preparation method comprises the following steps:

[0039] (1). Salt forming steps:

[0040] Dissolve 32mol monochloroacetic acid in water and stir thoroughly to form a monochloroacetic acid aqueous solution. Dissolve 70 mol of sodium hydroxide in water and stir well to form an aqueous solution of sodium hydroxide. Cool the prepared monochloroacetic acid aqueous solution and sodium hydroxide aqueous solution with ice water for later use. Ice water was passed into the interlayer of the reaction kettle to cool the reaction kettle. Aqueous monochloroacetic acid was added to the reaction kettle. The sodium hydroxide aqueous solution was slowly added dropwise under stirring, and the temperature of the reaction system was controlled at 25° C. by passing ice water or water into the interlayer of the reaction kettle during the reaction. When the measured pH value is 11, the dropwise addition is comple...

Embodiment 3

[0050] A kind of preparation method of diethylenetriamine pentaacetic acid, this preparation method comprises the following steps:

[0051] (1). Salt forming steps:

[0052] Dissolve 28mol monochloroacetic acid in water and stir thoroughly to form a monochloroacetic acid aqueous solution. Dissolve 65 mol of sodium hydroxide in water and stir thoroughly to form an aqueous solution of sodium hydroxide. Cool the prepared monochloroacetic acid aqueous solution and sodium hydroxide aqueous solution with ice water for later use. Ice water was passed into the interlayer of the reaction kettle to cool the reaction kettle. Aqueous monochloroacetic acid was added to the reaction kettle. The sodium hydroxide aqueous solution was slowly added dropwise under stirring, and the temperature of the reaction system was controlled at 24°C by passing ice water or water into the interlayer of the reaction kettle during the reaction. When the measured pH value is 11, the dropwise addition is co...

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Abstract

The invention relates to a method for preparing diethylenetriaminepentaacetic acid, which comprises the following steps of salification, condensation, acidification and purification. The diethylenetriaminepentaacetic acid is obtained by performing condensation reaction on diethylenetriamine and chloroacetic acid, and acidifying and purifying; and the preparation process has easy operation and low cost, and realizes the localization of the production of the diethylenetriaminepentaacetic acid. The diethylenetriaminepentaacetic acid prepared by the method provides a novel product which stabilizes the quality of developing solution, strengthens the fixation effect, shortens the developing time by 1.5 to 2 times, avoids sediment generation, strengthens the inoxidizability, and obviously improves the solubility and penetrability compared with the prior kit chemicals for a formula of colorful kit chemicals; and the quality of the product catches up with and surpasses that of foreign like products.

Description

technical field [0001] The invention belongs to the field of chemical reagents, in particular to a preparation method of diethylenetriaminepentaacetic acid. Background technique [0002] Diethylenetriaminepentaacetic acid (molecular formula: C 14 h 23 N 3 o 10 Structural formula such as formula I) belongs to ammonia carboxyl complexing agent, is widely used in petroleum industry and other various organic reagent fields. Especially because of its strong chelating property, it is widely used as acrylic fiber production, color inhibitor in paper industry, water softener, textile auxiliary agent, chelating titrant, etc. Especially used in color kits, the color kits added with diethylenetriaminepentaacetic acid can stabilize the quality of the developer, enhance the fixing effect, shorten the development time by 1.5-2 times, avoid precipitation, enhance oxidation resistance, and at the same time dissolve , permeability, etc. are significantly enhanced compared with the previ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/16C07C227/16
Inventor 张序红
Owner TIANJIN CHEM REAGENT RES INST
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