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Waste solvent treatment method

A treatment method and technology for waste solvents, which are applied in chemical instruments and methods, preparation of organic compounds, preparation of aminohydroxy compounds, etc., can solve problems such as waste of waste solvent components, reduce CO2 emissions, avoid negative effects, and be beneficial to the environment. protective effect

Active Publication Date: 2020-10-09
XINZHONGTIAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention intends to provide a treatment method for waste solvents to solve the waste of valuable components in waste solvents caused by incineration in the prior art The problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Table 1: Composition of waste solvents in an electronics factory (the components here are the actual waste solvent detection and analysis results)

[0025]

[0026] Table 1 shows the waste solvent composition of an electronics factory, and the ratio of each component obtained after detection and analysis.

[0027] The above-mentioned waste solvent is processed by this method, and its concrete steps are:

[0028] (1) vacuum distillation

[0029] The cleaned waste solvent is continuously pumped into the vacuum thin film evaporator at a feed rate of 1000kg / h. Specifically, a scraper thin film evaporator is used. The internal vacuum of the scraper thin film evaporator is 10kPa. Feed, scraper film evaporator jacket heating adopts 0.8MPa steam heating. The waste solvent vapor comes out from the top of the scraped thin film evaporator, and after being condensed by the top condenser of the scraped thin film evaporator (the temperature is controlled at 50°C), it enters the ...

Embodiment 2

[0043] Table 4: Composition of waste solvents in an electronics factory (the components here are the actual waste solvent detection and analysis results)

[0044]

[0045] Table 4 shows the waste solvent composition of an electronics factory, and the ratio of each component obtained after detection and analysis.

[0046] The above-mentioned waste solvent is processed by this method, and its concrete steps are:

[0047] (1) vacuum distillation

[0048] The cleaned waste solvent is continuously pumped into the vacuum thin film evaporator at a feed rate of 2000kg / h. Specifically, a scraper thin film evaporator is used. The internal vacuum of the scraper thin film evaporator is 30kPa. Feed, scraper film evaporator jacket heating adopts 0.8MPa steam heating. The waste solvent vapor comes out from the top of the scraped thin film evaporator, and after being condensed by the top condenser of the scraped thin film evaporator (the temperature is controlled at 60°C), it enters the ...

Embodiment 3

[0063] Table 7: Composition of waste solvents in an electronics factory (the components here are the actual waste solvent detection and analysis results)

[0064]

[0065] The waste solvent in above-mentioned table 7 is processed by this method, and its concrete steps are:

[0066] (1) vacuum distillation

[0067] The cleaned waste solvent is continuously pumped into the vacuum thin film evaporator at a feed rate of 1000kg / h. Specifically, a scraper thin film evaporator is used. The internal vacuum of the scraper thin film evaporator is 20kPa. Feed, scraper film evaporator jacket heating adopts 0.8MPa steam heating. The waste solvent vapor comes out from the top of the scraped thin film evaporator, and after being condensed by the top condenser of the scraped thin film evaporator (the temperature is controlled at 40°C), it enters the solvent receiving intermediate tank, and part of the uncondensed non-condensable gas (mainly containing trimethylamine solvent) Enter the ta...

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Abstract

The invention relates to the field of waste liquid treatment, and discloses a waste solvent treatment method. The method comprises the following steps that: (1) reduced pressure distillation is performed, specifically, a cleaned waste solvent is introduced into an evaporator for reduced pressure distillation, after the steam of the waste solvent passes through the top of the evaporator, liquid enters a solvent receiving intermediate tank; (2) drying and recycling are performed, specifically, solid-liquid mixed impurities are : introduced into a dryer for heating, so that a gas-phase part of the solvent flows into the solvent receiving intermediate tank after being condensed; (3) primary reduced pressure rectification is performed, specifically, the solvent in the solvent receiving intermediate tank is introduced into a rectifying tower I, light component impurities are extracted from the tower top of the rectifying tower I, and a product mixture is extracted from the tower kettle of the rectifying tower I; and (4) secondary reduced pressure rectification is performed, specifically, the product mixture is introduced into a rectifying tower II, monoethanolamine is extracted from thetower top of the rectifying tower II, and ethylene glycol is extracted from the tower kettle of the rectifying tower II. With the method adopted, the problem that valuable components in the waste solvent are wasted due to the fact that the waste solvent is treated in an incineration mode in the prior art can be solved.

Description

technical field [0001] The invention relates to the field of waste liquid treatment, in particular to a treatment method for waste solvents. Background technique [0002] PI (polyimide) film is a layer of uniform alignment film located on the surface of TFT and CF substrates, it can make the liquid crystal molecules arranged according to a certain pre-tilt angle, so as to control the direction of light passing through, and achieve display through appropriate driving voltage. the goal of. In the actual coating process of PI film, the coating effect of PI film is often affected by the state of TFT or CF substrate surface. PI liquid is generally a hydrophilic substance, and it is easy to diffuse unevenly on the surface with more organic residues. This uneven diffusion is generally referred to as PI non-stick. Due to the existence of PI non-stick, it often leads to broken bright spots in TFT-LCD products, which affects the quality of products. Therefore, before TFT or CF subs...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C213/10C07C215/08C07C29/80C07C31/20
CPCC07C213/10C07C29/80C07C215/08C07C31/202
Inventor 陈国平林辉荣何睿鸣左姣倾彩霞毛小英阳杨
Owner XINZHONGTIAN ENVIRONMENTAL PROTECTION
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