Sodium hydrosulfide production technology and apparatus

Abstract

The invention provides a sodium hydrosulfide production technology and apparatus. The technology comprises the following steps: using a first processor to receive and process acidic gas so as to obtain a first material flow and a second material flow; completely or partially returning the second material flow to the first processor; using a second processor to process the first material flow so as to obtain a third material flow (gas phase) and a fourth material flow (liquid phase); using a third processor to process the third material flow so as to obtain a fifth material flow (gas phase) and a sixth material flower (liquid phase); using a fourth processor to receive the fourth material flow and the third material flow from the second processor, and using the fourth material flow and the third material flow as the processing liquid to process the fifth material flow from the third processor so as to obtain a seventh material flow (gas phase) and an eighth material flow (liquid phase). The invention also provides a sodium hydrosulfide production apparatus.

Description

technical field [0001] The invention provides a method and device for treating acid gas, which belongs to the field of acid gas purification, and in particular relates to a treatment method and device suitable for the purification of sulfur-containing hydrogen compound acid gas and the recycling of 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 gas from small refineries. [0003] The treatm...

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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.

[0008] 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 The S component reacts with the cement material to generate CaSO4, and 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 realize environmental protection. and solve the dual purpose of fuel, however, this method has certain limitations and is not easy to promote

However, the sodium sulfide product of this process is prone to deterioration and is not easy to store

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