Process method and device for producing sodium hydrosulfide from acid gas

Abstract

The invention discloses a device for producing sodium hydrosulfide from acid gas. The device includes a reaction pipeline, one end of which is an acid gas inlet, and the other end is an acid gas outlet; The flow direction is the first-level reaction zone, the second-level reaction zone, the third-level reaction zone and the fourth-level reaction zone; each level of reaction zone is equipped with a liquid phase spray device, and the bottom of each level of reaction zone is equipped with a corresponding liquid storage tank. The upper part of each liquid storage tank is provided with a liquid seal assembly, and each liquid storage tank is provided with an absorption liquid inlet, a generated liquid outlet and a circulating liquid outlet, and the circulating liquid outlet is connected to the liquid phase spraying device through a pipeline. The method for producing sodium hydrosulfide from acid gas of the present invention uses NaOH solution as an absorbing liquid to process acid gas to produce sodium hydrosulfide. The process and device for producing sodium hydrosulfide from acid gas of the present invention have the characteristics of small scale, low energy consumption and non-blocking, and can realize the dual goals of acid gas purification and resource utilization.

Description

technical field [0001] The invention relates to a process method and device for producing sodium hydrosulfide from acid gas, which is suitable for the field of purification of acid gas, and is especially suitable for the purification of sulfur-containing hydrogen compounds and other acid gases and the processing method and device for recycling pollutants. Background technique [0002] Refinery acid gas mainly comes from sour water stripping, circulating hydrogen desulfurization, dry gas desulfurization and other devices. The acid gas mainly contains H 2 S, CO 2 . At present, the acid gas in most small refineries basically adopts the treatment method of post-combustion emission. On the one hand, this method causes a waste of resources, on the other hand, it brings huge pressure to environmental protection and affects the development space of enterprises. In order to protect the environment and ensure the full utilization of resources, it is imperative to recycle the acid g...

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Problems solved by technology

[0004] The two-stage Claus + tail gas hydrogenation reduction + solvent absorption technology has mature technology, stable operation, and stable product sulfur quality. However, due to the long process and large investment, the Claus process can only deal with high-concentration acid gases. 2 When the S volume fraction is less than 20%, the device is not easy to operate

This process can only produce 98% industrial sulfuric acid, but cannot produce oleum with higher value. At the same time, due to the difficulty in the transportation and storage of sulfuric acid, the stable market demand near the refinery is an important factor limiting its development.

[0010] CN1836767A discloses a treatment method for sour gas in refineries, utilizing sour gas as the fuel for shaft kilns in cement plants, when the sour gas is burned in the kiln, the H 2 S component reacts chemically with cement material to generate CaSO 4 , other harmful components are also sintered and transformed, which fundamentally solves the problem of acid gas treatment. At the same time, acid gas is used as a gas fuel to make the cement plant energy-saving fuel and achieve the dual purposes of environmental protection and fuel resolution. However, this The method has certain limitations and is not easy to promote

However, the operating efficiency of this process method is not high, the power generation is limited, and the economic benefit is poor.

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