A process and device for producing sodium hydrosulfide from acid gas

Abstract

The invention discloses a process method and device for producing sodium hydrosulfide by using acid gas. In the process method of the invention, part of the NaHS product solution is refluxed to an intermediate liquid storage tank, and reacted with NaOH to generate Na2S, and the Na2S solution is used as an absorption liquid to process Sodium hydrosulfide is produced from acid gas; exhaust gas is introduced in the intermediate reaction to increase the gas-liquid ratio and reduce the absorption of CO2. The production device of the present invention is composed of a liquid film absorption reactor, a liquid storage tank, an intermediate liquid storage tank, a pump, an instrument and pipe valve parts. In the absorption process, the absorption liquid is divided into one path to form a liquid film on the inner wall of the reactor to prevent sodium sulfide and sodium carbonate crystals from hanging on the wall due to overheating of the wall; a liquid film isolation layer is produced to prevent sodium sulfide and sodium carbonate crystal particles from adhering to the inner wall of the reactor. Compared with the existing technology, it reduces the absorption of CO2 and reduces the solid content in the system. The invention realizes the dual goals of purifying acid gas and recycling pollutants.

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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