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Edition and Publication

Edition and Publication:
< Natural Gas and Oil > Editorial Department
Hosted by:
China Petroleum Engineering & Construction Corporation Southwest Company
Authorized by:
China Petroleum Engineering & Construction Corporation
Co-hosted by:
Overseas Research Center of Research Institute of Petroleum Exploration and Development
Editor in Chief:
Du Tonglin
Vice Editor in Chief:
Tang Xiaoyong,Pu Liming
Address:
No.6, Shenghua Road, High-tech District, Chengdu, Sichuan, China
Postal Code:
610041
Tel:
028-86014709
028-86014500
Email:
cnpc-ngo@cnpc.com.cn
Issue:ISSN 1006-5539
CN 51-1183/TE

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Review on the Process of Redox Desulfurization Method

Author of the article:Chen Gengliang

Author's Workplace：PetroChina Southwest Oil & Gasfield Company Natural Gas Research Institute

Key Words：Redox desulfurization; Chelated iron method; Lo-Cat method; Auto-circulation reactor; Conventional dual tower; CrystaSulf method; Recirculating oxidation reactor

Abstract：

As a representative of redox desulfurization, the Lo-Cat (chelated iron desulfurization) method is briefly introduced in this article. Through discussion and analysis for reaction mechanism, solution formula, operation key points and developing trend of redox methods, it is pointed out that chelated iron method has already become the most important desulfurization one except alkanolamine methods. Recently there are two kinds of flow for chelated iron desulfurization, namely conventional dual tower and auto-circulation reactor. The former is suitable for feed gas with lower H₂S content and pressure, a small amount potential sulfur and high CO₂/H₂S ratio when CO₂ does not need removal and the latter is used for treating acid gas from regeneration tower of alkanolamine unit. The Lo-Cat Ⅱ method that came out in mid 1990s features recirculated oxidation reactor for increasing efficiency of catalyst significantly, so the capacity of sulfur loading can be improved over 10 times. Introduction of this process may be considered by relevant department. CrystaSulf method is an important technical progress in the redox desulfurization in recent years and full attention shall be paid to it.