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A method for recovery and treatment of sulfur-containing mixed waste gas in viscose fiber production

A viscose fiber recycling technology, which is applied in the recycling and processing of sulfur-containing mixed waste gas in the production of viscose fiber, and in the field of recycling and processing of sulfur-containing waste gas, achieves good technical feasibility and economic feasibility, high market promotion value, and satisfies The effect of social sustainable development

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

[0012] 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 recovery and treatment method for sulfur-containing mixed waste gas in viscose fiber production, which can recover sulfur-containing mixed waste gas in viscose fiber production Treatment, 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 method for recycling sulfur-containing mixed waste gas in viscose fiber production, comprising the following process steps:

[0036] A. After condensing and recovering carbon disulfide, the sulfur-containing mixed waste gas generated in the viscose fiber production process is sent to the alkali spray system for alkali spray absorption;

[0037] B. When the sodium sulfide content in the alkali spray absorption liquid is more than 20%, the absorption liquid can be used for the next reaction;

[0038] C, in the absorbing liquid that obtains in step B, drop acid solution, carry out acid analysis, the gas that separates out reclaims carbon disulfide again by condensation, makes hydrogen sulfide content reach more than 65% in the noncondensable gas that obtains;

[0039] D. Use milk of lime to spray and absorb the hydrogen sulfide in the non-condensable gas obtained in step C. When the concentration of calcium hydrosulfide in the milk of lime reaches the requirement for pro...

Embodiment 2

[0041] On the basis of embodiment 1, preferred:

[0042] In steps A and C of the present invention, the carbon disulfide recovered by condensation is condensed and recovered by using a graphite condenser.

[0043] In step A of the present invention, the condensing recovery of carbon disulfide specifically includes: firstly using normal temperature water and sulfur-containing mixed waste gas for heat exchange, so that the temperature of sulfur-containing mixed waste gas is reduced to 50°C, and then condensed with 5°C frozen water Carbon disulfide is recovered.

[0044] In step A of the present invention, the lye used for the alkali spray absorption is lye with a NaOH concentration of 30 g / L and a hemicellulose concentration of 40 g / L.

[0045] In step C of the present invention, the acid solution for acid analysis is a sulfuric acid solution with a sulfuric acid content of ≤20g / L, a fine fiber content of 0.05g / L, and a colloidal sulfur and sulfide content of 0.1g / L and 98 % c...

Embodiment 3

[0049] On the basis of embodiment 1, preferred:

[0050] In steps A and C of the present invention, the carbon disulfide recovered by condensation is condensed and recovered by using a graphite condenser.

[0051] In step A of the present invention, the condensing recovery of carbon disulfide specifically includes: firstly using normal temperature water and sulfur-containing mixed waste gas for heat exchange, so that the temperature of sulfur-containing mixed waste gas is reduced to 60°C, and then condensed with 8°C chilled water Carbon disulfide is recovered.

[0052] In step A of the present invention, the lye used for the alkali spray absorption is the lye with a NaOH concentration of 250g / L and a hemicellulose concentration of 150g / L.

[0053] In step C of the present invention, the acid solution for acid analysis is a sulfuric acid solution with a sulfuric acid content of ≤20g / L, a fine fiber content of 0.1g / L, and a colloidal sulfur and sulfide content of 0.5g / L and 98 ...

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Abstract

The invention relates to a recovery and treatment method for 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. The present invention proposes a new technical route aiming at the waste gas treatment situation of viscose fiber production enterprises at present, first pretreats the low-concentration sulfur-containing waste gas, then uses spray absorption technology to selectively absorb it, and then treats it The absorption liquid is processed, and finally a product with high cost performance is obtained. This technical route has a high degree of industrialization. While the mixed waste gas containing low concentration of H2S and CS2, a large amount of air and a small amount of solid waste in the production process of the viscose fiber industry can be treated in a timely and effective manner, it can also obtain certain The economic and social benefits, with good technical feasibility and economic feasibility, can meet the needs of sustainable social development.

Description

technical field [0001] The invention relates to a method for recycling 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 carbon disulfide (CS 2 ) and hydrogen sulfide (H 2 S) exhaust gas, hydrogen sulfide content is generally below 5%. Due to the low concentration of hydrogen sulfide, three treatment methods are generally used: [0003] 1. Alkali absorption method: use strong alkali (sodium hydroxide, sodium carbonate, etc.) to absorb low-concentration hydrogen sulfide waste gas to produce sodium hydrosulfide or sodium sulfide and put it on the market. This is the technology adopted by most viscose fiber manufacturers in China at present. Although ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C335/02C01B31/26B01D53/48B01D5/00C01B32/72
Inventor 邓传东王兵唐金钟尚书勇杜金江尹继国余兰英
Owner YIBIN GRACE
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