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A process for directly producing hydrogen sulfide by cracking hydrogen-rich gas with methanol/liquid ammonia

A hydrogen sulfide and liquid ammonia technology, applied in the production of hydrogen sulfide, sulfur compounds, hydrogen, etc., can solve the problems of large investment, high operating cost, and low resource utilization rate, shorten the process flow, reduce overall investment, and reduce resources Effect of Utilization Ratio Improvement

Inactive Publication Date: 2018-08-14
YANTAI TONGYE CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the common problems of the chemical synthesis method are that the supply of raw material hydrogen is inconvenient, and the supporting hydrogen production equipment is complex and expensive. Especially for small-scale hydrogen sulfide, the resource utilization rate and operating cost of hydrogen production raw materials are relatively high, and it is difficult to adapt. Flexible and diverse user needs
This method requires large investment, high operating costs, and low resource utilization, such as pressure swing adsorption separation. No matter how much adsorption is used, a certain amount of hydrogen must be released from the re-desorption gas, resulting in waste of resources, especially for small-scale production. This waste is proportionately higher when hydrogen

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  • A process for directly producing hydrogen sulfide by cracking hydrogen-rich gas with methanol/liquid ammonia

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Embodiment 1

[0042] A process for directly producing hydrogen sulfide by cracking hydrogen-rich gas with methanol / liquid ammonia, comprising the following steps:

[0043] 1) Make methanol and water into an aqueous solution at a volume ratio of 1:1, preheat the resulting aqueous solution to 80°C, and then vaporize it through the evaporator, and the vaporized mixed steam enters the superheater and raises the temperature to 200°C;

[0044] 2) The mixed steam of methanol and water after preheating enters cracking tower, and the control temperature in cracking tower is 250 ℃, and packing catalyst is commercially available Cu-Zn-Al methanol reforming catalyst, controls the contact time of steam and catalyst is 20s, and after the reaction ends, a CO 2 , CO, CH 4 Hydrogen-rich gas with a small amount of raw material steam;

[0045] 3) The generated hydrogen-rich gas enters the hydrogen sulfide synthesis tower, which is a fixed-bed reactor, and reacts with the liquid sulfur entering it in the hyd...

Embodiment 2

[0049]A preparation process for hydrogen sulfide, comprising the steps of:

[0050] 1) Preheat the liquid ammonia to 60°C, and then vaporize it through the evaporator, and the vaporized mixed steam enters the superheater to preheat to 600°C;

[0051] 2) The mixed steam of preheated ammonia and water vapor enters the cracking tower, the temperature in the cracking tower is controlled at 500°C, the filled catalyst is a commercially available iron-based ammonia synthesis catalyst, and the contact time between the steam and the catalyst is controlled to be 15s. After the end of the reaction, N 2 hydrogen-rich gas;

[0052] 3) The generated hydrogen-rich gas enters the hydrogen sulfide synthesis tower, which is a fixed-bed reactor, and reacts with the liquid sulfur entering it in the hydrogen sulfide synthesis tower. The reaction temperature is controlled at 400°C. The catalyst in the synthesis tower It is nickel loaded on alumina, the loading of nickel is 10wt%, and the loading ...

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Abstract

The invention relates to a preparation process of hydrogen sulfide. Hydrogen-rich gas is produced by directly taking ethanol / liquid ammonia as a hydrogen-containing raw material, and high-concentration hydrogen sulfide containing carbon dioxide (nitrogen gas) is synthesized; then, the hydrogen-rich gas is directly used for synthesizing the hydrogen sulfide. The defects of a traditional process that high-purity hydrogen gas is used as the raw material for producing the hydrogen sulfide, so that a hydrogen gas source is limited, the investment of equipment is great, and the operation cost is too high are eliminated.

Description

technical field [0001] The invention relates to a hydrogen sulfide preparation process, which belongs to the technical field of chemical production. Background technique [0002] Although hydrogen sulfide is a toxic and harmful gas in some occasions, it needs to be removed, such as: natural gas processing, purification in synthesis gas, hydrodesulfurization in petrochemical industry. [0003] However, it is also an essential and widely used chemical raw material, which is used as the basic raw material for the synthesis of various sulfur-containing compounds in the chemical industry. For example, in the field of inorganic chemical products, hydrogen sulfide is used to manufacture various inorganic sulfides such as sodium sulfide and sodium hydrosulfide, which are then used as raw materials for the manufacture of dyes, rubber products, pesticides, plastic additives, leather and medicines. In the production of organic chemical products, it is used to prepare methyl mercaptan,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/16C01B3/32C01B3/04
CPCC01B3/047C01B3/32C01B17/162C01B17/168C01B2203/06C01B2203/1223Y02E60/36
Inventor 高秀萍李天文孙晓辉
Owner YANTAI TONGYE CHEM TECH
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