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Method for recovery treatment of sulfur-containing mixed waste gas in production of viscose fiber

A viscose fiber, recycling and processing technology is applied in the field of recycling and processing sulfur-containing mixed waste gas in viscose fiber production, and recycling and processing sulfur-containing waste gas, so as to achieve the effects of reducing environmental protection pressure, high market promotion value and low production cost

Inactive Publication Date: 2014-05-07
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 recovery treatment of sulfur-containing mixed waste gas in production of viscose fiber, belonging to the technical field of treatment of the sulfur-containing waste gas in the production of the viscose fiber. According to the method provided by the invention, the sulfur-containing mixed waste gas in the production of the viscose fiber is treated through the steps of pretreatment, absorption, synthesis and the like and converted to thiourea to achieve the purpose of reutilizing the waste gas. The invention provides a method for producing thiourea by adopting the waste gas produced in the production process of a viscose fiber enterprise, a thiourea product with relatively high market values is obtained, the waste gas of the viscose fiber enterprise is effectively controlled, waste alkali and waste acid in the production process of the viscose fiber enterprise are simultaneously effectively utilized, then the viscose fiber enterprise can obtain certain economic benefits in the control process of the waste gas, and very high market popularization values are realized.

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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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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