Process for recycling sulfur-containing mixed waste gas in viscose production process

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, achieving the effects of high market promotion value, low production cost, and reduced environmental protection pressure

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

[0015] The present invention aims to solve the problem of how to deal with low-concentration sulfur-containing mixed waste gas in the above-mentioned prior art, and provides a process for recycling sulfur-containi

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A process for recycling sulfur-containing mixed waste gas from viscose fiber production, comprising the following process steps:

[0041] A. Enrichment stage

[0042] Spray and absorb the sulfur-containing mixed waste gas produced in the viscose fiber production process with sodium hydroxide solution, absorb for 10 hours, and form a saturated absorption liquid, then add acid liquid to the saturated absorption liquid, stir while adding, the pH value is 4 Stop adding the acid solution at that time, and precipitate the enriched hydrogen sulfide gas;

[0043] B. Absorption stage

[0044] Dissolve lime nitrogen in water and stir to make lime nitrogen emulsion. Use lime nitrogen emulsion to spray and absorb the enriched hydrogen sulfide gas obtained in step A. Keep the temperature at 20°C during the spray absorption process. Stop absorption when the concentration of calcium hydrosulfide in the absorption solution reaches 10%;

[0045] C. Synthesis stage

[0046] Raise the...

Embodiment 2

[0048] A process for recycling sulfur-containing mixed waste gas from viscose fiber production, comprising the following process steps:

[0049] A. Enrichment stage

[0050] Spray and absorb the sulfur-containing mixed waste gas produced in the viscose fiber production process with sodium hydroxide solution, absorb for 20 hours to form a saturated absorption liquid, then add acid liquid to the saturated absorption liquid, stir while adding, the pH value is 8 Stop adding the acid solution at that time, and precipitate the enriched hydrogen sulfide gas;

[0051] B. Absorption stage

[0052] Lime nitrogen is dissolved in water and stirred to form a lime nitrogen emulsion, and the enriched hydrogen sulfide gas obtained in step A is sprayed and absorbed by the lime nitrogen emulsion, and the temperature is kept at 50°C during the spray absorption process. Stop absorption after the concentration of calcium hydrosulfide in the absorption solution reaches 17%;

[0053] C. Synthesis...

Embodiment 3

[0056] A process for recycling sulfur-containing mixed waste gas from viscose fiber production, comprising the following process steps:

[0057] A. Enrichment stage

[0058] Spray and absorb the sulfur-containing mixed waste gas produced in the viscose fiber production process with sodium hydroxide solution, absorb for 15 hours to form a saturated absorption liquid, then add acid liquid to the saturated absorption liquid, stir while adding, the pH value is 6 Stop adding the acid solution at that time, and precipitate the enriched hydrogen sulfide gas;

[0059] B. Absorption stage

[0060] Dissolve lime nitrogen in water and stir to make lime nitrogen emulsion. Use lime nitrogen emulsion to spray and absorb the enriched hydrogen sulfide gas obtained in step A. During the spray absorption process, keep the temperature at 35°C. Stop absorption when the concentration of calcium hydrosulfide in the absorption solution reaches 13.5%;

[0061] C. Synthesis stage

[0062] Raise th...

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PUM

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Abstract

The invention relates to a process for recycling sulfur-containing mixed waste gas in a viscose production process, and belongs to the technical field of treatment of sulfur-containing waste gas in the viscose production process. According to the process, the sulfur-containing mixed waste gas in the viscose production process is treated and converted into thiourea through the steps of enrichment, absorption, synthesization and the like to achieve the purpose of recycling the waste gas. According to the method for producing the thiourea from the waste gas in the production process in viscose enterprises, a thiourea product with a relatively high market value is obtained, the waste gas in the viscose enterprises is effectively controlled and treated, waste alkali and waste acid in the production process in the viscose enterprises are effectively utilized, the viscose enterprises can obtain certain economic benefits in the waste gas control and treatment process, and the market promotion value is very high.

Description

technical field [0001] The invention relates to a process for recycling and treating sulfur-containing waste gas, more specifically, the present invention relates to a process for recycling and treating sulfur-containing mixed waste gas in viscose fiber production, which belongs to the technical field of treating sulfur-containing waste gas in viscose fiber production . Background technique [0002] Conventional thiourea synthesis process uses barium sulfide and hydrochloric acid to react to produce hydrogen sulfide gas, or utilizes refinery waste gas to produce thiourea. The hydrogen sulfide gas has high concentration and high purity, which is significantly different from the composition of sulfur-containing waste gas produced by viscose production. . The sulfur-containing waste gas of viscose fiber is very different from the sulfur-containing waste gas of other industries such as petrochemical industry in terms of composition and content. The sulfur-containing waste gas ...

Claims

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Application Information

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IPC IPC(8): B01D53/78C07C335/02
Inventor 邓传东王兵余兰英赵红霞干友华杨明桂
Owner YIBIN GRACE
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