Recycling treatment method of CS2 and H2S in waste gas in production of viscose fiber

Abstract

The invention relates to a recycling treatment method of CS2 and H2S in waste gas in production of viscose fiber. The recycling treatment method comprises the four steps of pretreatment at the early stage, enrichment and thickening, desorption and regeneration and separation and recycling. The recycling treatment method particularly comprises the following steps: in the process of pretreatment at the early stage, carrying out dust removal, cooling and drying treatment on the waste gas; in the enrichment and thickening process, carrying out absorption and catching on two types of gases in a concentration-reaction tank filled with an absorbing agent; in the desorption and regeneration process, carrying out stepwise desorption on CS2 and H2S by adopting selected inert gas; and in the separation and recycling process, extracting CS2 and H2S respectively by adopting a fractional condenser. The recycling treatment method solves the problems that the equipment adopting steam as a desorbing carrier is corroded, the microporous surface of active carbon is calcified, and drying is needed after desorption and regeneration, and has the advantages that no waste gas is discharged, the service life of the absorbing agent is prolonged and high-efficiency and environmentally-friendly effects are achieved and the like.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, in particular to a kind of CS in viscose fiber production waste gas 2 and H 2 S recycling method. Background technique [0002] Existing for CS 2 and H 2 Most of the treatment methods for S mixed gas are separate treatment methods, using alkaline absorbents (such as NaOH, NaOH, etc.) 2 CO 3 or NaHCO 3 aqueous solution) to absorb the H 2 S, and then use adsorbents (such as activated carbon or activated carbon fibers) to absorb the CS in it 2 , after which CS is extracted by desorption condensation 2 , that is, the method of alkali washing-adsorption condensation. For example, patent ZL201210245947.X discloses a 2 S and CS 2 The treatment method of mixed exhaust gas. However, the desorption carrier selected for the saturated adsorbent is water vapor. The desorption of water vapor will cause problems such as equipment corrosion and wastewater discharge. The desorption process w...

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Problems solved by technology

However, the desorption carrier selected for the saturated adsorbent is water vapor. The desorption of water vapor will cause problems such as equipment corrosion and wastewater discharge. The desorption process will also cause surface calcification of the micropores of activated carbon, which will reduce its service life. , and drying treatment is required after desorption, which reduces the efficiency of the process

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