Process and device for production of sodium hydrosulfide by using acidic gas

Abstract

The invention discloses a process and device for the production of sodium hydrosulfide by using acidic gas. The process is as below: back flowing portion of a NaHS solution product to an intermediate liquid storage tank; reacting the NaHS with NaOH to produce Na2S; treating the acidic gas with Na2S solution as absorption liquid; introducing exhausting steam in an intermediate stage of the reaction to improve the gas-liquid ratio and reduce CO2 absorbing capacity. The production device of the present invention comprises a liquid film absorption reactor, a liquid storage tank, an intermediate liquid storage tank, a pump, an instrument and pipe and valve members. The absorption process divides one path of the absorption liquid to form a film on the reactor wall, so as to prevent crystallization and wall adhesion of sodium sulfide and sodium carbonate due to overheating; a liquid film barrier layer is manufactured to prevent adhesion of sodium sulfide and sodium carbonate particles to the inner wall of the reactor. Compared with the prior art, the invention reduces the absorption of CO2 and solid content in the system. The invention achieves dual goals of acidic gas purification and contaminant recycling.

Description

technical field [0001] The invention relates to a process and device for producing sodium hydrosulfide by using acid gas, which belongs to the field of chemical engineering and is suitable for the comprehensive utilization of acid gas in the field of petrochemical industry, especially suitable for the production of sodium hydrogen sulfide 2 S, CO 2 It is a treatment and production device for the purification of acid gases and the recycling of pollutants. Background technique [0002] Sulfur element is ubiquitous in fossil fuels. When petroleum enters the process of fine fractionation and deep processing, it forms hydrogen sulfide gas with hydrogen. This process is often accompanied by carbon dioxide gas and ammonia gas. Sulfur element also exists in the raw materials of the metallurgical industry, but because the processing process is mostly under high temperature conditions, the sulfur element is oxidized, mainly producing sulfuric acid gas. Other working conditions that ...

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Problems solved by technology

This technology has problems such as expensive desulfurization catalyst, sulfur foam entrainment catalyst, low purity of sulfur product, and solid waste generation.

[0017] Acid gas is a mixed gas of hydrogen sulfide and carbon dioxide gas: in the field of petrochemical industry, acid gas is usually a mixture of hydrogen sulfide and carbon dioxide. When using alkali agent as absorbent to produce sodium sulfide or sodium hydrogen sulfide solution products, sulfide gas is usually formed. Sodium, sodium bisulfide, sodium carbonate, sodium bicarbonate and other substances, when the concentration reaches a certain value, crystallization will occur, causing the device to be blocked and continuous production cannot be realized normally

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