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A method for recycling sulfur-containing mixed waste gas from viscose fiber production

A viscose fiber and recovery treatment technology, which is applied in the field of recovery and treatment of sulfur-containing mixed waste gas in the production of viscose fiber, and in the field of recycling and treatment of sulfur-containing waste gas, to achieve the effects of low production cost, high market promotion value, and reduced environmental pressure

Inactive Publication Date: 2016-04-06
YIBIN GRACE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] 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 method for recycling and treating 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

[0039] A method for recycling sulfur-containing mixed waste gas in viscose fiber production, comprising the following process steps:

[0040]A. Preprocessing stage

[0041] Pre-treat the sulfur-containing mixed waste gas generated in the viscose fiber production process;

[0042] B. Absorption stage

[0043] Dissolve lime nitrogen in water, and stir to make lime nitrogen emulsion, spray and absorb the pretreated sulfur-containing mixed waste gas obtained in step A with lime nitrogen emulsion at room temperature, and wait for the calcium hydrosulfide in the lime nitrogen emulsion Stop absorbing after the concentration reaches 10%, obtain lime nitrogen emulsion absorption liquid;

[0044] C. Synthesis stage

[0045] Adjust the concentration of calcium hydrosulfide in the lime nitrogen emulsion absorption liquid in step B to 10%, then raise the temperature to 80°C, stir and react for 2 hours to obtain thiourea.

Embodiment 2

[0047] A method for recycling sulfur-containing mixed waste gas in viscose fiber production, comprising the following process steps:

[0048] A. Preprocessing stage

[0049] Pre-treat the sulfur-containing mixed waste gas generated in the viscose fiber production process;

[0050] B. Absorption stage

[0051] Dissolve lime nitrogen in water, and stir to make lime nitrogen emulsion, spray and absorb the pretreated sulfur-containing mixed waste gas obtained in step A with lime nitrogen emulsion at room temperature, and wait for the calcium hydrosulfide in the lime nitrogen emulsion Stop absorbing after the concentration reaches 17%, obtain lime nitrogen emulsion absorption liquid;

[0052] C. Synthesis stage

[0053] Adjust the concentration of calcium hydrosulfide in the lime nitrogen emulsion absorption liquid in step B to 13%, then raise the temperature to 85°C, stir and react for 5 hours to obtain thiourea.

Embodiment 3

[0055] A method for recycling sulfur-containing mixed waste gas in viscose fiber production, comprising the following process steps:

[0056] A. Preprocessing stage

[0057] Pre-treat the sulfur-containing mixed waste gas generated in the viscose fiber production process;

[0058] B. Absorption stage

[0059] Dissolve lime nitrogen in water, and stir to make lime nitrogen emulsion, spray and absorb the pretreated sulfur-containing mixed waste gas obtained in step A with lime nitrogen emulsion at room temperature, and wait for the calcium hydrosulfide in the lime nitrogen emulsion Stop absorbing after the concentration reaches 13.5%, obtain lime nitrogen emulsion absorption liquid;

[0060] C. Synthesis stage

[0061] Adjust the concentration of calcium hydrosulfide in the lime nitrogen emulsion absorption liquid in step B to 11.5%, then raise the temperature to 82.5°C, stir and react for 3.5h to obtain thiourea.

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Abstract

The invention relates to a method for recycling and treating sulfur-containing mixed waste gas in viscose fiber production, and belongs to the technical field of treating sulfur-containing waste gas in viscose fiber production. The invention treats the mixed waste gas containing sulfur in viscose fiber production through the steps of pretreatment stage, absorption stage and synthesis stage, and converts it into thiourea, so as to achieve the purpose of reusing the waste gas. The present invention proposes a method for producing thiourea by using the waste gas produced in the production process of viscose fiber enterprises, obtains a thiourea product with high market value, effectively controls the waste gas of viscose enterprises, and simultaneously eliminates the waste alkali in the production process of viscose enterprises The effective use of waste acid has enabled viscose enterprises to obtain certain economic benefits in the process of waste gas treatment, which has high market promotion value.

Description

technical field [0001] The invention relates to a method for recycling and treating sulfur-containing waste gas, more specifically, the present invention relates to a method for recycling and treating sulfur-containing mixed waste gas in viscose fiber production, which belongs to the technical field of treatment of sulfur-containing waste gas in viscose fiber production . Background technique [0002] During the production of viscose fiber, a large amount of waste gas containing carbon disulfide and hydrogen sulfide will be produced. Carbon disulfide and hydrogen sulfide are highly irritating and toxic to the human body and must be purified. Carbon disulfide is generally produced by condensation recovery and reuse. The treated waste gas containing hydrogen sulfide is generally treated by oxidation method, absorption method, adsorption method and biological method. [0003] Oxidation method, generally H 2 S is oxidized to elemental sulfur. At present, the common oxidation...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C335/02C01B31/26B01D53/14B01D53/78C01B32/72
Inventor 邓传东王兵尚书勇余兰英郑燕坪杜金江
Owner YIBIN GRACE
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