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Treatment method for recycling isatin wastewater

A technology of wastewater recovery and treatment method, applied in water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. The effect of reducing waste water discharge and simple structure

Inactive Publication Date: 2011-08-24
ZHEJIANG SHANYU TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] During the production of isatin, a large amount of wastewater containing low-concentration inorganic acids is produced, which is directly discharged, affecting the environment, and the useful substances in the wastewater cannot be effectively utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Embodiment one: 1., control the mass concentration of sulfuric acid at 10-40% when isatin is separated out, after filtering the product, collect the waste liquid, neutralize the waste liquid to neutrality with sodium carbonate, add an appropriate amount of activated carbon to fully absorb impurities, Filter to obtain a light yellow solution;

[0010] 2. Take 400 kg of the light yellow solution obtained in ①, add 24 kg of hydroxylamine sulfate, dropwise add 44 kg of chloral, and dropwise add 24 kg of aniline at normal temperature. At room temperature, filter, collect the filter cake, and put it into an oven for drying. 40.2 kg of dry product of N-acetaldoxime aniline was obtained, and the product purity was 99.0%. Wherein: the purity of hydroxylamine sulfate, chloral and aniline are all 99.9%, and the conversion rate of aniline is 94.2%.

Embodiment 2

[0011] Embodiment two: 1., replace sodium carbonate with potassium bicarbonate, replace gac with diatomaceous earth, repeat embodiment 1 step 1. described operation;

[0012] 2. Take 1500kg of the light yellow solution obtained in ①, add 90kg of hydroxylamine sulfate, dropwise add 165kg of chloral, and dropwise add 90kg of aniline at normal temperature. At room temperature, filter, collect the filter cake, and put it into an oven for drying. 148 kg of dry product of N-acetaldoxime aniline was obtained, and the product purity was 99.2%. Wherein: the purity of hydroxylamine sulfate, chloral and aniline are all 99.9%, and the conversion rate of aniline is 92.67%.

Embodiment 3

[0013] Embodiment three: replace sodium carbonate with magnesium oxide, replace gac with ion-exchange resin, repeat embodiment one step 1. described operation;

[0014] ②. Take 2000kg of the light yellow solution obtained in ①, add 120kg of hydroxylamine sulfate, dropwise add 220kg of chloral, and dropwise add 120kg of aniline at normal temperature. At room temperature, filter, collect the filter cake, and put it into an oven for drying. Obtain 200kg of dry product of N-acetaldoxime aniline, the product purity is 99.1%. Wherein: the purity of hydroxylamine sulfate, chloral and aniline are all 99.9%, and the conversion rate of aniline is 93.88%.

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Abstract

The invention relates to a treatment method for recycling isatin wastewater. The invention provides the treatment method for recycling the isatin wastewater, in order to solve the technical problem of filling in the gap of the prior art. The method comprises the following steps of: (1) controlling the mass concentration of sulfuric acid to be between 10 and 40 percent when materials are precipitated from the isatin, filtering a product, collecting waste liquid, neutralizing until the waste liquid is neutral by using inorganic base, and absorbing and filtering to remove impurities to obtain light yellow solution; and (2) taking 100 weight parts of light yellow solution obtained in step (1), adding 6 weight parts of hydroxylamine sulfate, dripping 11 weight parts of trichloracetic aldehyde, dripping 6 weight parts of aniline at normal temperature, raising the temperature to be between 75 and 100 DEG C after the materials are added, keeping the temperature for 1 to 3 hours, reducing to room temperature, filtering, collecting a filter cake, and drying to obtain a dry N-acetaldoxime aniline product. The method has the advantages of simple structure, environment friendliness and economization, and is a powerful weapon of economization, potential tapping and reduction of wastewater discharge of the conventional isatin production enterprises.

Description

technical field [0001] The invention relates to a treatment method for recycling and reusing isatin wastewater. Background technique [0002] During the production of isatin, a large amount of wastewater containing low-concentration inorganic acids is produced, which is directly discharged, affecting the environment, and the useful substances in the wastewater cannot be effectively utilized. Contents of the invention [0003] The technical problem to be solved by the present invention is how to fill the above-mentioned gap in the prior art, and provide a treatment method for recycling and reusing isatin wastewater. [0004] In order to solve the problems of the technologies described above, the processing method of isatin waste water recycling of the present invention may further comprise the steps: [0005] 1. When isatin is separated out, the mass concentration of sulfuric acid is controlled at 10-40%. After filtering the product, collect the waste liquid, neutralize th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C251/38C07C249/08C02F9/04
Inventor 陶国来
Owner ZHEJIANG SHANYU TECH CO LTD
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