Coating waste solvent recovery technology

A waste solvent and process technology, which is applied in the field of painting waste solvent recovery process, can solve the problems of difficult recovery, waste of valuable solvent resources, increased difficulty of hazardous waste incineration and difficulty of incineration tail gas treatment, etc.

Inactive Publication Date: 2019-08-23
XINZHONGTIAN ENVIRONMENTAL PROTECTION
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Macromolecular organic matter leads to relatively high viscosity of waste coating solvents, and simple recycling processes and equipment cannot realize the recovery of high-viscosity waste coating solvents.
[0008] Due to the complex composition of waste coating solvents and the difficulty in recycling, waste coating solvents are currently mainly treated as hazardous wastes for incineration, which not only wastes valuable solvent resources, but also increases the difficulty of hazardous waste incineration disposal and incineration tail gas treatment.

Method used

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  • Coating waste solvent recovery technology
  • Coating waste solvent recovery technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Recycling process see figure 1 ,in

[0040] P1-feed pump; P2-dehydrogenation reflux pump; P3-dehydrogenation discharge pump; P4-toluene reflux pump; P5-discharge pump; P6-butyl ester reflux pump; P7-xylene discharge pump; T1- Extraction tower; T2-light removal tower; T3-toluene tower; T4-xylene tower; E1-evaporator; E2-preheater; E3-dehydrogenation reboiler; E4-dehydrogenation condenser; E5-dehydrogenation Cooler; E6-Toluene Reboiler; E7-Toluene Condenser; E8-Xylene Reboiler; E9-Xylene Condenser; E10-Xylene Cooler; V1-Light Component Reflux Tank; V2-Toluene Reflux Tank; V3-Butyl Reflux Tank.

[0041] The specific operation steps are as follows:

[0042] (1) Extraction

[0043] Use desalted water as the extractant to extract ethanol, isopropanol, water and water-soluble resin from the waste coating solvent. Through actual operation, the volume flow ratio of desalted water to the waste coating solvent is controlled at 1:4 .

[0044] (2) Removal of impurities

[004...

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Abstract

The invention discloses a technology for recovering solvents from coating waste solvents. The recovered solvents are toluene, butyl acetate and / or xylene. The technology comprises the following steps:desalinized water is used as an extractant to remove ethanol, isopropyl alcohol, water and water-soluble resin, then impurity removal, light component removal, toluene rectification and xylene rectification treatments are carried out, and recovery is performed to obtain the toluene, butyl acetate and / or xylene meeting GB standards. The technology recycles the coating waste solvent, so the environmental pressure of waste-producing enterprises is reduced, and economic benefits are generated.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, in particular to a recovery process of painting waste solvent. Background technique [0002] With the rapid development of modern industry, spraying anticorrosion technology is also widely used, such as automobile spraying, steel structure spraying, mechanical parts spraying and so on. While spraying anticorrosion technology is widely used, a large amount of coating waste solvents are produced. Due to the complexity of coating waste solvents, there is no perfect process on the market to recycle the coating waste solvents. [0003] According to the market survey of waste solvents for painting, representative waste solvents for painting in the automobile industry are selected for research. The current composition of waste solvents for automobile painting is shown in the following table 1: [0004] Table 1 Composition of paint waste solvents in the automotive industry [0005] ...

Claims

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Application Information

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IPC IPC(8): C07C7/00C07C7/10C07C7/04C07C15/06C07C15/08C07C67/48C07C67/54C07C67/58C07C69/14
CPCC07C7/005C07C7/10C07C7/04C07C67/48C07C67/54C07C67/58
Inventor 左姣林辉荣毛小英阳杨何睿明陈国平
Owner XINZHONGTIAN ENVIRONMENTAL PROTECTION
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