Method for recycling volatile solvent in varnished wire production

A technology of volatile solvents and recovery methods, applied in separation methods, chemical instruments and methods, separation of dispersed particles, etc., can solve problems such as environmental pollution, achieve the effects of protecting the environment, achieving discharge standards, and saving resources

Inactive Publication Date: 2012-07-11
汉中厚华电工材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the baking process, the thinners cresol and xylene in the polyester paint volatilize into the atmosphere, seriously polluting the environment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] After the exhaust gas is pre-cooled to 250°C by air, the water is condensed to 35°C, cresol and xylene gas will be condensed and recovered. At normal temperature, after 20-30 days of residual gas being absorbed by white mineral oil circulation, the absorbent white mineral oil is regenerated by thin film evaporation, and cresol and xylene can be recovered at the same time. The conditions for thin film evaporation are: temperature 160°C, pressure 0.8atm, and the total recovery rate can reach 99.6%.

Embodiment 2

[0022] After the waste gas is pre-cooled by air to 250°C, water is condensed to 45°C, cresol and xylene gas will be condensed and recovered. At normal temperature, after 20-30 days of residual gas being absorbed by white mineral oil circulation, the absorbent white mineral oil is regenerated by thin film evaporation, and cresol and xylene can be recovered at the same time. The conditions for thin film evaporation are: temperature 160°C, pressure 0.8atm, and the total recovery rate can reach 98.8%.

Embodiment 3

[0024] After the exhaust gas is pre-cooled to 300°C by air, the water is condensed to 40°C, and the cresol and xylene gases will be condensed and recovered. At normal temperature, after 20-30 days of residual gas being absorbed by white mineral oil circulation, the absorbent white mineral oil is regenerated by thin film evaporation, and cresol and xylene can be recovered at the same time. The conditions for thin film evaporation are: temperature 160°C, pressure 0.8atm, and the total recovery rate can reach 99.2%.

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PUM

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Abstract

The invention discloses a method for recycling volatile solvent in varnished wire production, which comprises the steps of cooling waste gas exhausted from the top of a varnishing machine firstly by utilizing air as cooling media through countercurrent flow; further condensing the waste gas precooled by the air through water; selecting organic solvent white mineral oil with excellent dissolubility to cresol and xylene as an absorbent to absorb the remained uncondensed cresol and xylene gas which are contained in the waste gas precooled by the air and condensed through the water in a cycle mode; and after the white mineral oil performs cycle absorption for twenty to thirty days, regenerating the absorbent white mineral oil through thin film evaporation, processing the xylene and the cresol simultaneously, and secondarily recycling the cresol and the xylene.

Description

technical field [0001] The invention belongs to waste gas treatment technology, and relates to a production waste gas treatment process, in particular to a treatment method for waste gas in the enameled wire production process. Background technique [0002] The enameled wire is made by coating the corresponding lacquer solution on the outside of the drawn copper wire, and then volatilizing the solvent, curing the paint film, and cooling. The overall production is completed by enamelling machines. The enamelling machine is composed of five parts: pay-off device, wire take-up device, annealing device, paint baking cooling device and control cabinet. Among them, the paint baking and cooling device is an important part of the enamelling machine, which is divided into three parts: the paint room, the oven and the cooling frame. [0003] Traditional enamelling process: unwinding-annealing-painting-baking-cooling-winding. [0004] During the baking process, the thinners cresol a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78
Inventor 葛红光李德厚郭小华刘军海王新宇赵蔡斌李琛唐小波汤波
Owner 汉中厚华电工材料有限公司
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