A kind of recovery process of carbon disulfide in viscose fiber production

Abstract

Relating to the field of exhaust gas recovery in the viscose fiber industry, the invention provides a technology for recovery of carbon disulfide in viscose fiber production. The technology is characterized in that: the hydrogen sulfide in carbon disulfide exhaust gas produced in viscose fiber production is removed by alkali spraying, then carbon disulfide is recovered through the steps of: A) taking white oil as an absorbent to absorb carbon disulfide in the exhaust gas, cooling an absorption saturated carbon disulfide-rich solution to 15-35DEG C; B) pumping the absorption saturated carbon disulfide-rich solution into a desorption tower, passing the solution through a liquid distributor, then heating the solution to 150DEG C-170DEG C, boiling the solution so as to separate the carbon disulfide gas and a barren solution; and C) subjecting the carbon disulfide gas to condensation and gas-liquid separation, and recovering the condensed carbon disulfide. The recovery technology involved in the invention has the advantages of high absorption rate, and low investment and operation cost.

Description

technical field [0001] The invention relates to the field of waste gas recovery in the viscose fiber industry, in particular to a recovery process for carbon disulfide in viscose fiber production. Background technique [0002] The production of viscose fiber generally adopts alkaline yellowing glue making and acid coagulation forming process. Therefore, the waste gas generated in the production process of viscose fiber contains a large amount of H 2 S and CS 2 . CS in the exhaust 2 It mainly comes from the yellowing, 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] C 6 h 7 o 2 (OH) 3~X (OCSSH) X +H + →C 6 h 10 o 5 +XCS 2 ↑ [0005] Carbon disulfide is a colorless liquid at room temperature, volatile, extremely flammable and irritating. The existence of carbon d...

AI Technical Summary

Problems solved by technology

[0005] Carbon disulfide is a colorless liquid at room temperature, volatile, extremely flammable and irritating. The existence of carbon disulfide not only pollutes the environment, but also brings serious safety hazards to production. Therefore, carbon disulfide waste gas must be treated.

This patent uses activated carbon to adsorb carbon disulfide. The operating cost and investment cost of activated carbon adsorption are relatively high, the mass transfer and heat transfer between gas and solid is lower than that between gas and liquid, the absorption speed is slow, and the absorption effect is not as good as solvent adsorption.

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