Method for enriching carbon disulfide and hydrogen sulfide in viscose fiber waste gas

Abstract

The invention discloses a method for enriching carbon disulfide and hydrogen sulfide in viscose fiber waste gas. The method comprises a step A of collecting the viscose fiber waste gas, and using absorption liquid composed of alkali liquor and alkali cellulose; a step B of adding acid wastewater into solution after spraying reaction, and performing degassing after reaction; a step C of cooling and dewatering the degassed waste gas, and obtaining waste gas with the carbon disulfide concentration content larger than or equal to 25%, the hydrogen sulfide concentration content larger than or equal to 23% and the moisture content equal to or smaller than 0.5%. Through matched processing of absorption liquid spraying and acid-containing wastewater, carbon disulfide and hydrogen sulfide in viscose production waste gas are enriched; by applying the obtained high-concentration waste gas to a follow-up separation method, the recycling rate of carbon disulfide can be improved, the treatment of the viscose fiber waste gas is facilitated, and environmental protection pressure is reduced.

Description

technical field [0001] The invention relates to a method for enriching carbon disulfide and hydrogen sulfide in viscose fiber waste gas, in particular to a method for enriching carbon disulfide and hydrogen sulfide in waste gas during viscose fiber production, and belongs to the technical field of viscose chemical fiber production. Background technique [0002] In the production process of viscose fiber, due to many production processes, long production cycle and the use of a large amount of chemical raw materials from the yellowing process to the spinning process, some toxic and harmful industrial waste gas will inevitably be produced, the main components of which are from CS for yellowing, spinning and acid stations 2 and H 2 S gas. [0003] At present, there are three main ways to deal with waste gas from viscose fiber production: [0004] 1. Alkali washing and spraying: use lye (NaOH) to spray and absorb the waste gas to generate Na 2 S, the re-production film is exp...

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Problems solved by technology

[0004] 1. Alkali washing and spraying: use lye (NaOH) to spray and absorb the waste gas to generate Na 2 S, the re-production film is exported, this method has no effect on H 2 The effect of S treatment is obvious, but for CS 2 The treatment effect is poor;

[0005] 2. Activated carbon adsorption: use carbon adsorption process to treat a large amount of tail gas, desorb and recover CS 2 , such as the patent document CN103721524A (a method of recovery and treatment of waste gas from viscose fiber production, 2014.04.16) records that the two gases are absorbed in the concentration-reaction tank filled with adsorbents through the process of enrichment and concentration Capture, desorption regeneration process and then select inert gas to CS 2 and H 2 S is desorbed step by step, and there are defects such as complicated operation and adjustment during operation, low degree of recycling, and high operating costs;

[0007] Based on the above situation, it can be seen that the existing treatment methods for viscose fiber production waste gas still have problems such as unsatisfactory treatment effect and high production cost, especially the condensed recovery of CS 2 method that requires high concentrations of CS 2 Its efficiency is the most obvious when it is recycled. Based on this, in order to improve the treatment efficiency of waste gas in the viscose industry, the present invention proposes a method for enriching carbon disulfide and hydrogen sulfide in the waste gas of viscose fiber