Method for regenerating active carbon after decoloration of glycin mother liquid

A technology of glycine mother and activated carbon, which is applied in separation methods, filter regeneration, chemical instruments and methods, etc., can solve the problems of high cost of reaction devices, large amount of concentrated sulfuric acid, difficult recycling and other problems, and achieves low secondary pollution and high efficiency. Economic benefits and easy control of reaction conditions

Inactive Publication Date: 2010-11-17
CHONGQING UNIV
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Problems solved by technology

However, this method has the problems that the amount of concentrated sulfuric acid is too large, and its recycling is difficult; in addition, some relatively complicated pretreatments and

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  • Method for regenerating active carbon after decoloration of glycin mother liquid
  • Method for regenerating active carbon after decoloration of glycin mother liquid

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[0012] A method for regenerating activated carbon after decolorization of glycine mother liquor. The method is an electrochemical regeneration method and includes the following steps:

[0013] ①Put the undried waste activated carbon into the electrolytic cell, add NaOH solution and simethicone in sequence, some of the untreated waste activated carbon exists in the form of agglomeration, but the structure is loose, and it is easy to disperse in the liquid. Mix it with the added solution successively to form a mixed slurry, wherein the water content of the waste activated carbon is 37.0~38.5%, the concentration of the NaOH solution is 0.1~0.3mol / L, the waste activated carbon: NaOH solution: dimethyl silicone oil = 1kg: 10L: 100~500mL;

[0014] ②Then, put the electrolytic cell into the water bath, insert the two graphite electrode plates into the mixed slurry, and the two electrode plates face each other, and insert the bubbling air tube connected with the bubbler into the mixed slurr...

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Abstract

The invention discloses a method for regenerating active carbon after decoloration of glycin mother liquid, which is an electrochemical regeneration method. The method comprises the following steps of: mixing waste active carbon not dried, NaOH solution and simethicone in an electrolytic cell, putting the electrolytic cell into a water bath, and inserting two graphite plate electrodes and a bubbling airpipe into mixed slurry; performing electrolysis, and simultaneously blowing and bubbling; standing, precipitating, and scraping simethicone floating on the upper layer; and filtering for separation, and drying a filter cake to obtain the regenerated active carbon. The method has the advantages of simple and convenient operation, easily controlled reaction conditions, small loss of the active carbon, small or large scale, and relative low overall cost.

Description

technical field [0001] The invention relates to regeneration technology of waste activated carbon. Background technique [0002] Glycine is an important raw material for food and medicine. Glycine mother liquor, the product of glycine produced by chloroacetic acid ammonolysis, has a deep color except for a certain amount of impurities. If it is not refined and purified, it cannot meet the requirements of food and medicine Pharmaceutical grade glycine on request. The current industrial refining and purification method for glycine is to use active carbon to adsorb and decolorize, and then recrystallize. In order to make glycine reach the required quality index, this refining and purification needs to be repeated 2 to 3 times, which will consume a large amount of ethanol and activated carbon, and the production cost is relatively high. Therefore, in addition to the need to recover ethanol for reuse, the regeneration of its activated carbon (in this specification, referred to ...

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Application Information

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IPC IPC(8): B01J20/34B01J20/20C07C229/08C07C227/40
Inventor 陶长元刘作华杜军范兴邱调军周小霞刘仁龙孙大贵左赵宏
Owner CHONGQING UNIV
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