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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received October 15, 2002
Accepted April 14, 2003

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Microbial Desulfurization of Dibenzothiophene and 4,6-Dimethyldibenzothiophene in Dodecane and Straight-Run Diesel Oil

Luo Mingfang Xing Jianmin Gou Zhongxuan Liu Huizhou^† Chen Jiayong

State Key Laboratory of Biochemical Engineering, Laboratory of Separation Science and Engineering,Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100080, China

hzliu@home.ipe.ac.cn

Korean Journal of Chemical Engineering, July 2003, 20(4), 702-704(3), 10.1007/BF02706911

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Abstract

The desulfurization of dibenzothiophene (DBT), 4,6-dimethyldibenzothiophene (4,6-DMDBT) and their mixture by lyophilized cells of Pseudomonas delafieldii R-8 was studied in the presence of dodecane. The desulfurization rate for 4,6-DMDBT was found to be about 40% in comparison with that for DBT. The desulfurization process for DBT and 4,6-DMDBT proceeded simultaneously without preference for either one. The desulfurization rate for each compound was decreased when they were mixed together. The extent of desulfurization of 4,6-DMDBT was increased_x000D_ with the increase of cell concentration and the decrease of the volume ratio of oil-to-water used. The specific desulfurization rate for 4,6-DMDBT could be reached to 10.4 mmol sulfur kg(-1) (cell) h(-1) [approximately 0.33 mg sulfur g(-1) (cell) h(-1)]. Pseudomonas delafieldii R-8 showed high desulfurization capability for straight-run diesel oil (containing 1,807 mg/L of sulfur). About 1,000 mg/L of sulfur in diesel oil was removed by resting cells of this strain in 24 h of reaction. The specific desulfurization rate was 8.75 mmol sulfur kg(-1) (cell) h(-1).

Keywords

Biodesulfurization Dibenzothiophene Diesel Oil Pseudomonas delafieldii Two-phase System

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