A method and system for producing high purity sodium hydrosulfide

By combining vertical and horizontal reaction separation devices with multi-stage gas-liquid contact and ejectors, the circulation of sodium-containing alkaline solution was optimized, solving the problems of complex process and low purity in sodium hydrosulfide preparation in oil refining and chemical industry, and realizing the preparation of high-purity sodium hydrosulfide and low hydrogen sulfide emissions.

CN122499718APending Publication Date: 2026-08-04CHINA NAT PETROLEUM CORP +3
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Patent Information

Application Number
CN202511581008.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-10-31
Publication Date
2026-08-04

AI Technical Summary

Technical Problem

In existing technologies, the process of preparing sodium hydrosulfide from hydrogen sulfide-containing acidic gas generated by oil refining and chemical industry is complex, with high equipment and operating costs. The sodium hydrosulfide product has low purity, and the exhaust gas contains a high amount of hydrogen sulfide, making it difficult to emit directly.

Method used

The system design employs vertical and horizontal reaction separation devices combined with multi-stage gas-liquid contact and ejectors. Through multi-stage neutralization reaction and stripping processes, the recycling of sodium-containing alkaline solution is optimized, impurity content is reduced, and the purity of sodium hydrosulfide is improved.

Benefits of technology

The preparation of high-purity sodium hydrosulfide has been achieved, which reduces the hydrogen sulfide content in exhaust gas, simplifies the process, and reduces equipment and operating costs.

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Abstract

The application relates to the technical field of hydrogen sulfide preparation equipment, in particular to a method and system for preparing high-purity sodium hydrosulfide. The system takes sulfur-containing hydrogen sulfide acidic gas as raw material, controls the generation of impurities through one of a steam contact section, a first gas-liquid contact section, a second gas-liquid contact section and a third gas-liquid contact section, deeply absorbs and controls the escape of hydrogen sulfide through a horizontal gas-liquid reactor of a two-section combined reaction part, and circulates and uses sodium-containing alkaline liquor introduced by a boundary sodium-containing alkaline liquor introduction pipe of a two-section circulation part, so as to reduce the exogenous impurities of the sodium-containing alkaline liquor, accurately control and prevent the reaction imbalance between the sodium-containing alkaline liquor introduced by the boundary sodium-containing alkaline liquor introduction pipe and the acidic gas discharged by the one-section combined reaction part, finally realize the preparation of high-purity sodium hydrosulfide and the synchronous realization of low-sulfur hydrogen sulfide content purified tail gas emission, and the system does not need to additionally add impurity removal reagents or tail gas treatment reagents, and conforms to the design concept of green chemical industry.
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