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Centralized purification treatment process and device of waste gas in spandex production process

A production process and purification treatment technology, which is applied in the direction of chemical instruments and methods, dispersed particle separation, separation methods, etc., can solve the problems of production plant and surrounding environmental hazards, environmental pollution, etc., and achieve the goals of preventing pollution, simplifying the process, and saving space Effect

Active Publication Date: 2012-02-08
TOWERSMASTER NANJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Especially in the tunnel gas of the high temperature spinning process, in addition to most of the air and water vapor, it also contains dimethylamine, formaldehyde, acetic acid, dimethylacetamide (DMAc), dimethylformamide (DMF), ammonia , Methanol and other toxic organic substances, if they are directly vented, it will seriously pollute the environment
[0006] At present, the method of dealing with the waste gas in the production process of spandex is generally direct emptying, so the harm to the production plant and the surrounding environment is self-evident

Method used

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  • Centralized purification treatment process and device of waste gas in spandex production process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Waste gas absorption during the production process of annual production of 3kt spandex with dimethylacetamide (DMAc) as solvent

[0029] The operation steps of the exhaust gas absorption method in the spandex production workshop are attached Figure 1 shown. The system is mainly composed of absorption tower, pure water storage tank, rare organic acid absorption liquid storage tank and other equipment. There are metering and control instruments and pipelines between each equipment. The waste gas collected in the waste gas storage tank V-1 (containing 5 mg / m 3 Dimethylacetamide vapor, 20 mg / m 3 Acetic acid vapor, 40 mg / m 3 formaldehyde, 56 mg / m 3 Dimethylamine gas and 13 mg / m 3 Ammonia) with blower P-1 through pipeline 1 and gas distributor A-1 into the composite solution absorption unit of absorption tower T-1 (the composite solution is a composite solution composed of 0.1M sodium hydroxide and 0.3M sodium nitrite solution), according to the content o...

Embodiment 2

[0030] Example 2: Waste gas absorption during the production process of annual production of 5kt spandex with dimethylacetamide (DMAc) as solvent

[0031] The operation steps of the exhaust gas absorption method in the spandex production workshop are attached Figure 1 shown. The system is mainly composed of absorption tower, pure water storage tank, rare organic acid absorption liquid storage tank and other equipment. There are metering and control instruments and pipelines between each equipment. The waste gas collected in the waste gas storage tank V-1 (containing 25 mg / m 3 Dimethylacetamide vapor, 12 mg / m 3 formaldehyde, 120 mg / m 3 Acetic acid vapor, 45 mg / m 3 Dimethylamine gas and 16 mg / m 3 Ammonia) with blower P-1 through pipeline 1 and gas distributor A-1 into the composite solution absorption unit of absorption tower T-1 (the composite solution is a composite solution composed of 0.4M sodium carbonate and 0.5M sodium nitrite ), according to the content of exha...

Embodiment 3

[0032] Example 3: Waste gas absorption during the production process of annual production of 10kt spandex with dimethylacetamide (DMAc) as solvent

[0033] The mode of operation is as in Example 1. The waste gas collected in the waste gas storage tank V-1 (containing 50 mg / m3 of dimethylacetamide vapor, 31 mg / m 3 formaldehyde, 400mg / m3 of acetic acid vapor, 100mg / m3 of dimethylamine gas and 5mg / m3 of ammonia gas) with blower P-1 through pipeline 1 and gas distributor A-1 into the composite of absorption tower T-1 Solution absorption unit (the solution is a composite solution composed of 3.0M sodium bicarbonate and 3.5M sodium nitrite), according to the content of exhaust gas components in the gas and the amount of exhaust gas treatment, the flow meter FM-1 is used to control the spraying amount of the composite solution , the spray density of this embodiment is 8m 3 / m 2 h), so that the content of acetic acid in the gas after the complex solution absorption unit is reduce...

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Abstract

The purpose of the invention is to provide a process and a device for the purification treatment of waste gas generated during spandex production. Waste gas generated during spandex production of the invention is introduced into an absorption tower by a blower, orderly passes through a composite solution absorption unit and an organic acid solution absorption unit, and is discharged from the top part of the absorption tower; the total content of harmful gas in the discharged gas is less than 0.5 mg / m3. During the process, the composite solution absorption unit is firstly used to absorb gas easily dissolved in water and alkali liquor in the waste gas, such as dimethylformamide, dimethylacetamide, acetic acid, formaldehyde, and the like, and part of dimethylamine and ammonia gas are also absorbed; then the organic acid solution absorption unit is used for reabsorption so as to remove remaining harmful gas which is alkaline and is easily dissolved in water; and the tail gas discharge reaches the standard. The absorption process thoroughly removes harmful components in waste gas generated in spandex production industry, thus effectively prevents ambient air pollution, and has an economically feasible treatment process.

Description

field of invention [0001] The invention relates to a process and a device for centralized purification treatment of waste gas in the production process of spandex. Background technique [0002] Polyurethane elastic fiber is called Spandex abroad, and the product name in my country is spandex. Spandex has the incomparable elasticity of any other fiber. Its elongation at break is greater than 400%, usually between 500% and 700%, and the highest can reach more than 800%. When the deformation is 300%, the elastic recovery rate is over 95%. Excellent fatigue resistance. From the perspective of manufacturing process, there are currently four industrial spinning production routes for spandex, namely dry spinning, wet spinning, reaction spinning and melt spinning. The solvents used in the first three spinning methods are DMF and DMAc, among which the dry spinning production capacity accounts for 86.39% of the total production capacity and is in a dominant position. [0003] The p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/58B01D53/72
Inventor 张志炳周政张进王宝荣李岩宝张益兴
Owner TOWERSMASTER NANJING
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