Iminodiacetic acid energy saving cleaning production method

A technology of iminodiacetic acid and iminodiacetic acid disalt is applied in the field of energy-saving and clean production of iminodiacetic acid, which can solve the problems of short conversion time in the early stage, increased demand for membranes, and difficulty in implementation, and reduce the generation of inorganic salts. The effect of saving sulfuric acid and steam, saving production cost

A technology of iminodiacetic acid and iminodiacetic acid disalt is applied in the field of energy-saving and clean production of iminodiacetic acid, which can solve the problems of short conversion time in the early stage, increased demand for membranes, and difficulty in implementation, and reduce the generation of inorganic salts. The effect of saving sulfuric acid and steam, saving production cost

CN104119243AInactive Publication Date: 2014-10-29CHONGQING UNISPLENDOUR CHEM
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  • Iminodiacetic acid energy saving cleaning production method

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Embodiment 1

[0034] Prepare iminodiacetonitrile reaction solution: add aluminum trioxide to hydroxyacetonitrile with a concentration of 55% by weight, and the addition amount is 0.5% by weight of hydroxyacetonitrile, stir and mix well at room temperature, then acidify with dilute sulfuric acid to pH value Is 5, preheated to 50℃; preheated 25% by weight ammonia water to 170℃; respectively enter the continuous reactor with metering pump, the flow rate of hydroxyacetonitrile is 2m 3 / h, the reaction temperature is controlled at 120°C~130°C, the reaction pressure is 0.5Mpa, the residence time of the materials in the reactor is 0.5 minutes; the reaction mixture at the outlet of the reactor is extremely cold to 100°C to obtain the iminodiacetonitrile reaction liquid, According to analysis, the content of iminobisacetonitrile is 310g / L, the content of hydroxyacetonitrile is 30g / L, the content of triacetonitrile is 10g / L, the content of aminoacetonitrile is 1g / L, the content of ammonia is 5g / L, The ...

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Abstract

The invention discloses an iminodiacetic acid energy saving cleaning production method which comprises the following steps: 1) an iminodiacetic acid saline solution as a raw material enters into a bipolar membrane electrodialysis system for bipolar membrane electrodialysis treatment, the salt room pH is controlled within 3-4 to obtain an iminodiacetic acid salt and iminodiacetic acid mixed solution, and an alkaline solution is obtained in an alkali room; 2) an acid is added into the iminodiacetic acid salt and iminodiacetic acid mixed solution obtained in the step 1) for acidizing to the pH of 2-2.5; 3) an iminodiacetic acid and inorganic salt mixed solution obtained in the step 2) is separated and purified to respectively obtain iminodiacetic acid and an inorganic salt. According to the method, dilution is not needed, the formation quantity of the inorganic salt can be reduced by about 70%, the power consumption is greatly reduced, and the best economic benefit is achieved. In addition, an iminodiacetonitrile reaction liquid is directly used as a staring raw material, so that complex purification process of iminodiacetonitrile can be avoided.

Description

technical field [0001] The invention relates to a production method of an organic acid, in particular to an energy-saving and clean production method of iminodiacetic acid. Background technique [0002] Iminodiacetic acid, CAS No. 142-73-4, abbreviated as IDA, is an important chemical intermediate, widely used in pesticides, medicines, rubber, heavy metal complexing agents, etc., mainly used for the synthesis of glyphosate (glyphosate), etc. Pesticide intermediates, but also used in complexing agents, cleaning agents, stabilizers and surfactants. [0003] The industrial production routes of iminodiacetic acid include iminodiacetonitrile hydrolysis method and diethanolamine dehydrogenation method. Since domestic diethanolamine relies on imports, the price fluctuates greatly, so iminodiacetic acid is produced from iminodiacetonitrile to produce glyphosate Has become the domestic mainstream route. But, existing iminodiacetic acid industrial production method has following tw...

Claims

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Application Information

Patent Timeline
29 Oct 2014
Publication
CN104119243A
IPC
C07C229/16; C07C227/18; C25B3/00
Inventors
吴传隆; 秦岭