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Method for recovering waste solvent solution at normal temperature

A technology of normal temperature recovery and waste solvent, used in organic chemistry, separation/purification of hydroxyl compounds, etc., can solve the problems of low solvent concentration, difficult solid waste disposal, and difficult cleaning, etc., to achieve the effect of high concentration

Pending Publication Date: 2021-07-13
惠州鸿为新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Distillation recovery process is usually used in the prior art, but the recovery of solvent by rectification has the following defects: 1. The concentration of the recovered solvent is not high, and the average concentration is about 87°
2. Due to the existence of nylon fine powder and additives in the solvent, there will be a certain viscous substance hanging on the wall in the later stage of distillation, which makes cleaning difficult. At the same time, the treatment of solid waste is also a big problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. Put 100 kilograms of waste ethanol into a 300-liter atmospheric decolorization kettle, add 500 grams of activated carbon, start stirring, stir for 60 minutes, and stop;

[0040] 2. After the decolorization is completed, put the material into the suction filter tank, let it stand for 30 minutes, turn on the vacuum pump, and carry out vacuum suction filtration. The material after suction filtration is pumped into the normal pressure dehydration kettle for dehydration treatment. Waste, centralized treatment;

[0041] 3. Add 10 kg of anhydrous copper sulfate into the dehydration kettle, stir for 30 minutes, and stop the machine;

[0042] 4. After the dehydration is completed, put the material into the suction filter tank, let it stand for 30 minutes, turn on the vacuum pump, and carry out vacuum suction filtration. The material after suction filtration is pumped into the ethanol storage tank, and the dehydrated copper sulfate pentahydrate can be sold as an industrial pro...

Embodiment 2

[0047] 1. Put 100 kilograms of waste ethanol into a 300-liter atmospheric decolorization kettle, add 1000 grams of activated carbon, start stirring, stir for 30 minutes, and stop;

[0048] 2. After the decolorization is completed, put the material into the suction filter tank, let it stand for 60 minutes, turn on the vacuum pump, and carry out vacuum suction filtration. The material after suction filtration is pumped into the normal pressure dehydration kettle for dehydration treatment. Waste, centralized treatment;

[0049] 3. Add 20 kg of anhydrous copper sulfate into the dehydration kettle, stir for 60 minutes, and stop the machine;

[0050] 4. After the dehydration is completed, put the material into the suction filter tank, let it stand for 30 minutes, turn on the vacuum pump, and carry out vacuum suction filtration. The material after suction filtration is pumped into the ethanol storage tank, and the dehydrated copper sulfate pentahydrate can be sold as an industrial pr...

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PUM

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Abstract

The invention discloses a method for recovering a waste solvent solution at normal temperature. The method comprises the following steps: removing pigments in the waste solvent solution by using a decolorizing agent at 60 DEG C or below to obtain a decolorized solution; and carrying out solid-liquid separation on the decolorized solution to obtain a recovered solution, wherein the adding amount of the decolorizing agent is 0.3-5% of the total mass of the waste solvent solution. According to the method for recovering the waste solvent solution at normal temperature, the solvent for nylon preparation can be recovered at the normal temperature, the concentration of the obtained recovered solvent is high, and meanwhile the problem that cleaning is difficult due to the fact that viscous substances are hung on the wall is solved. And the solvent method for preparing nylon powder can be virtually recycled and is worthy of large-area popularization and application.

Description

technical field [0001] The invention relates to the technical field of solution recovery and utilization, in particular to a normal temperature recovery method of waste solvent solution. Background technique [0002] During the preparation of nylon powder by the solvent method, the solution will oxidize and yellow due to the solvents used (ethanol, methanol, toluene, etc.) at high temperatures, especially the short carbon chain molecules in the nylon molecule and the amines produced during the decomposition process. , which exacerbates the degree of yellowing of the solvent. At the same time, because the solvent will volatilize to a certain extent during the nylon production process, the purity of the solvent will be reduced. normal production needs. [0003] In addition, in order to realize the recycling of solvents and reduce the production cost of nylon, solvents are usually recycled and reused. Distillation recovery process is usually used in the prior art, but rectifi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C29/74C07C31/08
CPCC07C29/74C07C31/08
Inventor 周义能田家强陈玉婷周唤谢志佳
Owner 惠州鸿为新材料科技有限公司
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