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Method and apparatus for preparing iminodiacetic acid by using iminodiacetonitrile to produce mother liquor

A technology of iminodiacetonitrile and iminodiacetic acid is applied in the field of the reuse method of iminodiacetonitrile production mother liquor and its supporting device field, which can solve the problems of high phase separation temperature, lowering the recovery rate of iminodiacetonitrile and the like

Inactive Publication Date: 2015-10-14
CHONGQING UNISPLENDOUR CHEM
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Problems solved by technology

This method has the following problems: the phase separation temperature is high (80-100°C), and the solubility of iminodiacetonitrile is greater than 100g / 100mL at this temperature, which will inevitably reduce the recovery rate of iminodiacetonitrile, and organic There are more impurities dissolved in the material layer, and the crude product of iminodiacetonitrile needs to be purified

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  • Method and apparatus for preparing iminodiacetic acid by using iminodiacetonitrile to produce mother liquor

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[0080] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0081]The schematic diagrams of the method and device of technical scheme one, two and three of the present invention are respectively as follows figure 1 , figure 2 , image 3 shown. The steps of the three technical schemes before obtaining the hydrogen peroxide decolorizing solution are exactly the same, and the difference lies in the subsequent processing steps of the hydrogen peroxide decolorizing solution. Therefore, their respective supporting devices are also the same in the first half and different in the second half.

[0082] The device of the technical scheme 1 includes a reaction kettle, a solid-liquid separator I, a hydrolysis kettle, an acidification kettle, a crystallization kettle, a solid-liquid separator II, a concentrated crystallization kettle and a solid-liquid separator III connected in sequence.

[0083] The d...

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Abstract

The invention discloses a method and apparatus for preparing an iminodiacetic acid by using iminodiacetonitrile to produce mother liquor. The method comprises: adding calcium oxide or calcium hydroxide to the mother liquor to react so that glycolonitrile and aminoacetonitrile contained in the mother liquor are transformed into minodiacetonitrile, transforming sulphuric acid, ammonium and ammonium sulfate into calcium sulfate, and thus obtaining solid calcium sulphate and iminodiacetonitrile solution through solid-liquid separation; and hydrolyzing the iminodiacetonitrile solution into iminodiacetic acid disodium salt by using sodium hydroxide, using peroxide to decolorize the iminodiacetic acid disodium salt, performing the separation of a destaining solution by using the sulfuric acid to acidify once and then perform multiple crystallization or firstly performing continuous chromatography and then performing crystallization separation separately, or using the sulfuric acid to perform graded acidification, and then performing crystallization separation separately so as to obtain solid iminodiacetic acid and solid sodium sulfate. The method of the invention is simple in process and low in investment; not only iminodiacetonitrile produced mother liquor is effectively treated, an expensive incinerator is not needed to be bought, and secondary pollution of waste gas from an incinerator can also be prevented; furthermore, the glycolonitrile, aminoacetonitrile and iminodiacetonitrile contained in the mother liquor can be effectively recovered so as to prepare iminodiacetic acid with economic value, thereby reducing the production cost.

Description

technical field [0001] The invention belongs to the field of resource utilization of chemical wastewater, and relates to a method for reusing iminodiacetonitrile production mother liquor and a supporting device thereof. Background technique [0002] Iminodiacetic acid is an important fine chemical product. It has strong complexation and can form chelates with various metal ions. It is widely used in pesticides, dyes, chemicals, water treatment, medicine, functional polymers, electronics, etc. has wide application. [0003] The production process of iminodiacetonitrile (abbreviated as IDAN) is to use hydrocyanic acid as the starting material, absorb formaldehyde solution to synthesize hydroxyacetonitrile aqueous solution, and continuously react the hydroxyacetonitrile aqueous solution with ammonia to obtain the reaction solution containing iminodiacetonitrile. Through multiple crystallization and separation, iminodiacetonitrile product and mother liquor are respectively obta...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C229/16C07C227/18C07C227/42
Inventor 丁永良尹应武刘佳郑道敏郑伯川王冬林
Owner CHONGQING UNISPLENDOUR CHEM
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