Method for preparing hydrogen sulfide

Abstract

The present invention relates to a method for preparing hydrogen sulfide. The method uses molten sulphur and hydrogen as starting materials, including a synthesizing stage of hydrogen sulfide and a refining stage of hydrogen sulfide. The synthesizing stage of hydrogen sulfide includes steps of evaporating and vaporizing the molten sulphur in an evaporator by utilizing an electric induction heating device on the periphery of the evaporator to obtain sulfuric vapors; putting the hydrogen into the evaporator, pre-heating, rising temperature, intensive mixing with the sulfuric vapors to obtain the gas mixture of hydrogen and sulfuric vapors; and putting the gas mixture of hydrogen and sulfuric vapors into a synthesizing tower, and synthesizing to obtain the gas mixture of hydrogen sulfide, hydrogen and sulfuric vapors. The refining stage includes steps of removing the sulfuric vapors from the gas mixture of hydrogen sulfide, hydrogen and sulfuric vapors, absorbing the hydrogen sulfide and regenerating to obtain the refined hydrogen sulfide gas. The molten sulphur is evaporated by utilizing the electric induction evaporator, which is easy to control the temperature and has high evaporation efficiency.

Description

technical field [0001] The invention relates to a method for preparing hydrogen sulfide. Background technique [0002] Hydrogen sulfide is an important chemical raw material, which is mainly used in the synthesis of fine organic chemicals and inorganic salts, such as the manufacture of pesticides and pharmaceuticals, the refining of metals and the manufacture of various industrial reagents. [0003] There are two main sources of hydrogen sulfide: one is to recover hydrogen sulfide gas from various industrial gases containing hydrogen sulfide, such as recovering hydrogen sulfide gas from petroleum refinery gas, natural gas or coal gas; the other is to synthesize hydrogen sulfide gas through different methods, For example, the direct synthesis of sulfur and hydrogen, the reaction of iron sulfide, calcium sulfide, etc. with dilute sulfuric acid to synthesize hydrogen sulfide gas, and the thermal decomposition of oil, oil and sulfur to generate hydrogen sulfide gas. [0004] Th...

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Problems solved by technology

[0005] The recovery of hydrogen sulfide gas from industrial gas is restricted by the content of hydrogen sulfide in industrial gas, and the impurity content in the product hydrogen sulfide is high; iron sulfide reacts with dilute sulfuric acid to synthesize hydrogen sulfide gas, and thermal decomposition of oil, oil and sulfur generates hydrogen sulfide gas , will produce a large amount of waste liquid, which not only wastes a lot of resources, reduces the economy of production, but also seriously pollutes the environment

[0006] The method of dissolving liquid sulfur in a solvent and reacting with hydrogen to produce hydrogen sulfide works well in the early stage, but as the reaction progresses, the solvent will coke, the reaction efficiency will decrease, and it is difficult to operate industrially

[0007] Problems to be solved in the method of directly synthesizing hydrogen sulfide gas with sulfur vapor and hydrogen: First, liquid sulfur needs to be heated and vaporized to above 300°C, so there are low sulfur evaporation efficiency and selection of heat-resistant and sulfur-resistant materials for evaporators and synthesis towers Second, the reaction between sulfur vapor and hydrogen is a strong exothermic reaction, and the current reactor is difficult to effectively control the temperature, resulting in low conversion rate of hydrogen sulfide and insufficient recovery of reaction heat

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