Metal-based ionic liquid hydrogen sulfide dehydrogenation process is internationally advanced

Overcome technical problems and promote industrial upgrading

Sinochem News Network News On June 11, the environmental catalysis and separation process research team of Beijing University of Chemical Technology announced its latest research results
.
The team successfully developed a new process and resource recovery technology for metal-based ionic liquid hydrogen sulfide (H₂S), and passed the appraisal of scientific and technological achievements organized by the China Petroleum and Chemical Industry Federation

Anqing Petrochemical Claus hydrogenation tail gas metal-based ionic liquid desulfurization

The technology was developed jointly by Beijing University of Chemical Technology, Xuanhua Iron and Steel Group Co.
, Ltd.
, Anqing Branch of China Petroleum and Chemical Corporation, Zhangjiakou Tianlong Technology Development Co.
, Ltd.
and other units
.

According to the team leader, Professor Yu Jiang from Beijing University of Chemical Technology, the water-phase wet oxidative desulfurization technology is widely used in the treatment of hydrogen sulfide acid gas in industrial process gas.
It needs to be operated under alkaline and oxygen-enhancing regeneration conditions, but the desulfurization process There are carbon dioxide gas interference and excessive oxidation of hydrogen sulfide, leading to bottlenecks such as easy degradation of desulfurizers, a large amount of secondary salts, and poor sulfur quality
.

Appraisal meeting site

In order to solve the above problems, the team put forward a new idea of ​​wet oxidation desulfurization with metal-based ionic liquids, and developed a non-aqueous iron-based ionic liquid wet oxidative desulfurization with funding from the National “863” Program and the National Natural Science Foundation of China.
New technology, and completed on-site verification and sideline demonstrations in Linfen, Nanyang, Tianjin, Anqing and other places, involving coke oven gas, biogas (biogas), refinery gas, sour water stripping tail gas, Claus hydrogenation tail gas, and oil field companions.
The purification of anger
.

According to reports, the process has achieved an ultra-low emission of hydrogen sulfide removal rate of over 99% and an outlet hydrogen sulfide concentration of less than 5 ppm, which solves the problem of carbon dioxide interference and excessive oxidation of hydrogen sulfide during the desulfurization process to produce secondary salts and high-salt organic wastewater discharge.
The problem of using direct sulfur melting technology to solve the problem of high impurity content of sulfur products in the sulfur melting process, so that the purity of the sulfur product is not less than 99%, and the reuse value is high, and the near-zero discharge of sulfur paste solid waste is realized
.

Relevant technologies have completed industrial demonstration applications in coke oven gas, Claus hydrogenation tail gas and other systems to realize the greening and resource utilization of purification processes
.
Using this technology, the hydrogen sulfide content of Claus hydrogenation tail gas of Sinopec Anqing Branch is reduced to below 8mg/m³, the sulfur purity after sulfur melting reaches 99.

Xuangang coke oven gas desulfurization

The process exhibits the characteristics of green, high efficiency, high sulfur quality, short process, good maneuverability and no water consumption, which provides a solution for the in-situ treatment of natural gas and oilfield associated gas in China's remote, remote, scattered, and limited gas fields.
A new idea has unique advantages
.

Up to now, the project has applied for nearly 30 national invention patents, 10 of which have been authorized, and have completely independent intellectual property rights
.

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Hydrogen sulfide is a colorless and highly toxic gas, mainly from domestic waste treatment, sewage treatment, petroleum processing, natural gas, coal chemical, fertilizer, pharmaceutical and other industries
.
In 2000, China only processed crude oil to produce 1.

　　The removal methods of hydrogen sulfide are roughly divided into two types: dry method and wet method
.
The Claus process is a typical and most widely used high temperature dry desulfurization process in industry

　　Therefore, the construction of a new desulfurization process can not only realize the high-efficiency desulfurization purification efficiency of the desulfurization liquid at low temperature, liquid phase, and catalytic oxidation, but also fundamentally solve the problems of low sulfur paste quality and large amount of waste liquid treatment, which is important for improving the sustainability of the enterprise.

(Pictures are provided by the team of Professor Yu Jiang from Beijing University of Chemical Technology)