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Recycling method and device for iminodiacetonitrile production mother liquor

A technology of iminodiacetonitrile and iminodiacetic acid, which is applied in the field of recovery and reuse of iminodiacetonitrile production mother liquor, can solve the problems of reducing the recovery rate of iminodiacetonitrile and high phase separation temperature, so as to prevent secondary pollution, The effect of less investment and lower production costs

Inactive Publication Date: 2015-09-09
CHONGQING UNISPLENDOUR CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

Method used

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  • Recycling method and device for iminodiacetonitrile production mother liquor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The schematic diagram of the method and device is as figure 1 shown.

[0047] The device comprises a reaction tank, a hydrolysis tank, a solid-liquid separator I, an acidification tank, a solid-liquid separator II, a crystallization tank and a solid-liquid separator III connected in sequence.

[0048] The specific method is as follows:

[0049] (1) Take 1kg of iminodiacetonitrile production mother liquor (containing 8.2wt% hydroxyacetonitrile, 5.8wt% iminodiacetonitrile, 4.4wt% aminoacetonitrile, 59.5wt% water, 16.5wt% (sulfuric acid+ammonium bisulfate+ammonium sulfate )), adding 110g of calcium oxide with a content of 97% to adjust the pH value to 8.5, and reflux for 1.5 hours. Sampling analysis showed that the contents of hydroxyacetonitrile and aminoacetonitrile were both less than 0.5%;

[0050] (2) Add 115g of calcium oxide with a content of 97% to the reaction solution obtained in step (1), stir and react at 55~60°C for 2 hours, then raise the temperature to 95~...

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Abstract

The invention discloses a recycling method and device for iminodiacetonitrile production mother liquor. Calcium oxide or calcium hydroxide is added to the iminodiacetonitrile production mother liquor for a reaction to enable glycolonitrile and aminoacetonitrile contained in the mother liquor to be converted into the iminodiacetonitrile and enable sulfuric acid, ammonium bisulfate and ammonium sulfate to be converted into calcium sulfate. According to the method, the process is simple, low investment is required, the iminodiacetonitrile production mother liquor can be treated effectively, an expensive incinerator is not required to purchase, secondary pollution due to waste gas incineration is prevented, the glycolonitrile, the aminoacetonitrile and the iminodiacetonitrile in the mother liquor can be recycled effectively, iminodiacetic acid with economic value is prepared, and the production cost can be reduced.

Description

technical field [0001] The invention belongs to the field of resource utilization of chemical waste water, and relates to a method for recycling and reusing iminodiacetonitrile production mother liquor and a supporting device thereof. Background technique [0002] 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 obtained. The mother liquor of iminodiacetonitrile production contains a large amount of iminodiacetonitrile, hydroxyacetonitrile, aminoacetonitrile, sulfuric acid, ammonium bisulfate and ammonium sulfate, and some other organic polymers. Due to the complex composition...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C227/02C07C227/18C07C229/16C07C253/30C07C253/34C07C255/25C01F11/46
Inventor 尹应武丁永良郑道敏刘佳郑伯川廖翠莺孙响响王冬林
Owner CHONGQING UNISPLENDOUR CHEM