Method for recycling hydrogen sulfide waste gas

A hydrogen sulfide and waste gas technology, applied in chemical instruments and methods, separation methods, pulping waste gas treatment, etc., can solve the problems of insufficient utilization and products that cannot be added again, so as to realize reuse, reduce pressure and solve environmental pollution and production safety hazards

Inactive Publication Date: 2012-06-27
YIBIN HIEST FIBER +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The treatment of this kind of exhaust gas is to use new sodium hydroxide solution to react with hydrogen sulfide to generate sodium hydrogen sulfide, and then use activated carbon to absorb and recover carbon disulfide. Although this treatment method can treat hydrogen sulfide exhaust gas to a certain extent, it needs to use Extra sodium hydroxide solution, and the final product cannot participate in the reaction again, and its value is not fully utilized

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  • Method for recycling hydrogen sulfide waste gas
  • Method for recycling hydrogen sulfide waste gas

Examples

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Effect test

Embodiment 1

[0031] A method for recycling hydrogen sulfide waste gas, the main steps are as follows:

[0032] A. Pulp is impregnated to obtain alkali fiber. The pulp here mainly refers to cotton, wood or wood II pulp. The waste lye produced after the alkali fiber is squeezed through the pressing process, and the waste lye is treated by membrane filtration to recover 50% of the hydroxide After sodium, obtain secondary waste lye, sodium hydroxide content is 170g / L in the secondary waste lye, and the alkali fiber content of hemicellulose is 30g / L;

[0033] The membrane filtration treatment refers to passing the spent alkali through a nanofiltration membrane with a pore size of 10nm. Sodium hydroxide can pass through the membrane pores, but the alkali fiber of hemicellulose cannot pass through. Therefore, a part of sodium hydroxide can be separated and recovered for production, and the secondary The alkali concentration of spent alkali is lower than that of primary spent alkali;

[0034] B. ...

Embodiment 2

[0048] A method for recycling hydrogen sulfide waste gas, the main steps are as follows:

[0049] A. Pulp is impregnated to obtain alkali fiber. The pulp here mainly refers to cotton, wood or wood II pulp. The waste lye produced after the alkali fiber is squeezed through the pressing process, and the waste lye is treated by membrane filtration to recover 50% of the hydroxide After sodium, obtain secondary waste lye, sodium hydroxide content is 90g / L in the secondary waste lye, and the alkali fiber content of hemicellulose is 50g / L;

[0050] The membrane filtration treatment refers to passing the spent alkali through a nanofiltration membrane with a pore size of 10nm. Sodium hydroxide can pass through the membrane pores, but the alkali fiber of hemicellulose cannot pass through. Therefore, a part of sodium hydroxide can be separated and recovered for production, and the secondary The alkali concentration of spent alkali is lower than that of primary spent alkali;

[0051] B. T...

Embodiment 3

[0064] A method for recycling hydrogen sulfide waste gas, the main steps are as follows:

[0065] A. Pulp is impregnated to obtain alkali fiber. The pulp here mainly refers to cotton, wood or wood II pulp. The waste lye produced after the alkali fiber is squeezed through the pressing process, and the waste lye is treated by membrane filtration to recover 50% of the hydroxide After sodium, obtain secondary waste lye, sodium hydroxide content is 120g / L in the secondary waste lye, and the alkali fiber content of hemicellulose is 40g / L;

[0066] The membrane filtration treatment refers to passing the spent alkali through a nanofiltration membrane with a pore size of 10nm. Sodium hydroxide can pass through the membrane pores, but the alkali fiber of hemicellulose cannot pass through. Therefore, a part of sodium hydroxide can be separated and recovered for production, and the secondary The alkali concentration of spent alkali is lower than that of primary spent alkali;

[0067] B. ...

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Abstract

The invention relates to the field of waste gas recovery in viscose fiber industry, in particular to a method for recycling hydrogen sulfide waste gas. The method mainly includes the steps: A, squeezing alkali fibers to generate waste alkali liquor, and subjecting the waste alkali liquor to membrane filtration to obtain secondary waste alkali liquor; B, utilizing the secondary waste alkali liquor as alkali absorption liquor, and jointly delivering the secondary waste alkali liquor and the hydrogen sulfide waste gas generated during viscose fiber production to an alkali spray tower; and C, utilizing drained alkali spray absorption liquor as digestion liquor for sulfate pulping, and delivering Na2S (sodium sulfide) obtained by reaction and the rest of NaOH (sodium hydroxide) liquor to a pulping process. The method has the advantages that the method is high in hydrogen sulfide waste gas absorption efficiency and large in treatment quantity in unit time, the problems of environmental pollution and potential production safety hazards due to hydrogen sulfide waste gas emission are solved, and the purposes of treating waste with waste and turning the waste into wealth are realized by the aid of the waste alkali liquor generated by squeezing the alkali fibers.

Description

technical field [0001] The invention relates to the field of waste gas recycling in the viscose fiber industry, in particular to a method for recycling hydrogen sulfide waste gas. Background technique [0002] The production of viscose fiber generally adopts alkaline yellowing glue making and acid coagulation forming process. Therefore, the exhaust gas content produced in the production process of viscose fiber has a large amount of H 2 S and CS 2 . H in exhaust gas 2 S mainly comes from the coagulation forming and plasticizing stretching process of viscose fiber, and is produced by the by-product of the yellowing reaction of alkali cellulose. The main reaction formula is: [0003] Na 2 CS 3 +H 2 SO 4 →Na 2 S+CS 2 ↑+H 2 S↑ [0004] Na 2 S x +H 2 SO 4 →Na 2 SO 4 +H 2 S↑+ (x-1)S [0005] Na 2 S+H 2 SO 4 →Na 2 SO 4 +H 2 S↑ [0006] Hydrogen sulfide is a colorless, pungent, flammable, explosive and highly toxic gas. The existence of hydrogen sulfide not...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/78B01D53/52D21C11/06
Inventor 易家祥邓传东段美科瞿继丹张仁友李蓉玲李向华
Owner YIBIN HIEST FIBER
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