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Recovery processing process for sulfur-containing mixed waste gas in production of viscose

A viscose fiber, recycling technology, applied in the direction of carbon-sulfur compounds, carbon disulfide, organic chemistry, etc., to achieve the effect of high market promotion value

Inactive Publication Date: 2014-04-16
YIBIN GRACE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] The present invention aims to solve the problem of how to deal with low-concentration sulfur-containing waste gas in the above-mentioned prior art, and provides a recovery and treatment process for sulfur-containing mixed waste gas in viscose fiber production, which can treat sulfur-containing mixed waste gas in viscose fiber production , and converted into thiourea to achieve the purpose of reuse of waste gas

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A process for recycling sulfur-containing mixed waste gas in viscose fiber production, comprising the following process steps:

[0036] A. Dust removal pretreatment

[0037] Pre-treat the sulfur-containing mixed waste gas generated in the viscose fiber production process;

[0038] B. Separation stage of hydrogen sulfide and carbon disulfide

[0039] Mix and stir lime nitrogen, lime and water to make an absorption liquid, pass the sulfur-containing mixed waste gas that has been pretreated by dust removal into two spray absorption towers, and use the absorption liquid to spray and absorb to absorb the sulfur in the sulfur-containing mixed waste gas Hydrogen is obtained as saturated absorption liquid, and carbon disulfide is separated at the same time, and recovered by condensation;

[0040] C, preparation of thiourea

[0041]The temperature of the saturated absorption liquid obtained in step B is raised to 80° C., and then kept for 1 hour for reaction, and filtered to ...

Embodiment 2

[0043] A process for recycling sulfur-containing mixed waste gas in viscose fiber production, comprising the following process steps:

[0044] A. Dust removal pretreatment

[0045] Pre-treat the sulfur-containing mixed waste gas generated in the viscose fiber production process;

[0046] B. Separation stage of hydrogen sulfide and carbon disulfide

[0047] Lime nitrogen, lime and water are mixed and stirred to make absorption liquid, and the sulfur-containing mixed waste gas that has been pretreated by dust removal is passed into 5 spray absorption towers, and the absorption liquid is used for spray absorption to absorb the sulfide in the sulfur-containing mixed waste gas Hydrogen is obtained as saturated absorption liquid, and carbon disulfide is separated at the same time, and recovered by condensation;

[0048] C, preparation of thiourea

[0049] The temperature of the saturated absorption liquid obtained in step B is raised to 85° C., and then kept for 3 hours for react...

Embodiment 3

[0051] A process for recycling sulfur-containing mixed waste gas in viscose fiber production, comprising the following process steps:

[0052] A. Dust removal pretreatment

[0053] Pre-treat the sulfur-containing mixed waste gas generated in the viscose fiber production process;

[0054] B. Separation stage of hydrogen sulfide and carbon disulfide

[0055] Lime nitrogen, lime and water are mixed and stirred to make absorption liquid, and the sulfur-containing mixed waste gas that has been pretreated by dust removal is passed into three spray absorption towers, and the absorption liquid is used for spray absorption to absorb the sulfide in the sulfur-containing mixed waste gas Hydrogen is obtained as saturated absorption liquid, and carbon disulfide is separated at the same time, and recovered by condensation;

[0056] C, preparation of thiourea

[0057] The temperature of the saturated absorption liquid obtained in step B is raised to 82.5° C., and then kept for 2 hours for...

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PUM

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Abstract

The invention relates to a recovery processing process for sulfur-containing mixed waste gas in the production of viscose and belongs to the technical field of treatment of the sulfur-containing mixed waste gas in the production of the viscose. According to the recovery processing process, a thiourea product is prepared by dust-removing pretreatment, a hydrogen sulfide and carbon disulfide separation phase and a thiourea preparation step; meanwhile, carbon disulfide is recycled. According to the recovery processing process, main harmful components of the viscose waste gas, namely hydrogen sulfide gas and carbon disulfide gas in the waste gas, are managed. According to the recovery processing process, the problem that the low-concentration hydrogen sulfide in the viscose waste gas is not easy to treat is solved by a thiourea production manner and the carbon disulfide in the waste gas is recycled and utilized.

Description

technical field [0001] The invention relates to a process for recycling sulfur-containing waste gas, more specifically, the present invention relates to a process for recycling sulfur-containing mixed waste gas in viscose fiber production, and belongs to the technical field of treatment of sulfur-containing waste gas in viscose fiber production . Background technique [0002] In the production process of viscose fiber, a large amount of mixed waste gas containing carbon disulfide and hydrogen sulfide will be produced. The carbon disulfide in the exhaust gas is generally produced by condensation recovery and reuse, or the carbon disulfide is separated by removing other substances such as hydrogen sulfide in the exhaust gas. Hydrogen sulfide in exhaust gas generally adopts three treatment methods due to its low concentration: [0003] 1. Sodium hydrosulfide or sodium sulfide is produced and put into the market after alkali spray absorption. This is the technology adopted by ...

Claims

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Application Information

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IPC IPC(8): C07C335/02C01B31/26B01D53/14C01B32/72
Inventor 邓传东冯涛王兵唐金钟尹继国杜金江张自如
Owner YIBIN GRACE