Method for preparing sodium sulfide from hydrogen sulfide waste gas produced in production of viscose fibre

Abstract

The invention relates to the field of production of viscose fibre in the textile industry, in particular to a method for preparing sodium sulfide from hydrogen sulfide waste gas produced in the production of the viscose fibre. The method comprises the steps as follows: A, the waste gas is fed into an alkali spray tower; B, hydrogen sulfide is absorbed in an alkali liquor in the alkali spray tower; C, impurities are removed; D, a preheated absorption liquid is delivered into a primary multi-effect evaporator; E, a solution is subject to settlement and desalination; F, the desalinated solution is filled into a semi-finished product barrel, and caustic soda is added into the desalinated solution; G, the solution in the semi-finished product barrel is delivered into a secondary single-effect evaporator; H, after undergoing the secondary evaporation, the solution is filled into a finished product barrel, and then is stirred for crystallization; and I, crystal sodium sulfide is made into tablets. The method has the advantage of realizing the optimal generation of sodium sulfide through the setting of processing parameters such as the size of main equipment, the pore diameter of a delivery pipeline, wind volume, wind velocity, the concentration of the alkali liquor, absorption time, circulating evaporation time, evaporation temperature, evaporation vacuum degree, precipitation time, stirring velocity, the rotational speed of a tablet making machine, and the like.

Description

technical field [0001] The invention relates to the field of viscose fiber production in the textile industry, in particular to a method for preparing sodium sulfide from hydrogen sulfide waste gas produced in viscose fiber production. Background technique [0002] At present, the production of viscose fiber generally adopts the process of alkaline sulfonation rubber making and acid coagulation forming. During the production process, a large amount of hydrogen sulfide waste gas that is harmful to human health and the environment will be produced. Therefore, hydrogen sulfide waste gas must be treated. Recycling. At present, there are three common recovery and treatment methods for the hydrogen sulfide waste gas generated in the viscose fiber production process: [0003] 1. Combustion method: mainly by using the flammability of hydrogen sulfide gas, the exhaust gas containing hydrogen sulfide is burned through a combustion furnace for oxidation reaction, and finally sulfuric ...

AI Technical Summary

Problems solved by technology

The above-mentioned patent converts hydrogen sulfide waste gas into sodium hydrogen sulfide liquid after treatment, which is also a single production method, and the scope of production resource utilization is narrow

[0014] In addition to the above deficiencies, at present, in the viscose fiber industry, there are two deficiencies in the production process of producing sodium sulfide from hydrogen sulfide waste gas: 1. The sodium sulfide solution has strong alkali corrosion damage to production equipment, and production The life of the equipment is short; 2. The sodium sulfide product produced by the existing production process has high iron ion content and low product quality, which cannot meet the needs of the high-quality soda sulfide industry

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