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Citation: GUO Xiu-Yan, LI Shu-Yuan, YUE Chang-Tao, NI Xian-Ming. Desulfurating Benzothiophene with New Reduction Method[J]. Chinese Journal of Applied Chemistry, ;2006, 23(9): 982-987. shu

Desulfurating Benzothiophene with New Reduction Method

1.
State Key Laboratory of Heavy Oil Processing, China University of Petroleum, Beijing 102249

Corresponding author: GUO Xiu-Yan,
Received Date: 10 September 2005
Available Online: 22 December 2005
Fund Project: 中国石油科技中青年创新基金(04E7030) (04E7030)中国石油大学重油开放基金(2004-0J) (2004-0J)

A new reductive protocol of desulfurization was developed to desulfurate benzothiophene with KBH₄ as reductant.Experimentally,the appropriate masses of CoCl₂·6H₂O and KBH₄ were 0.50 g and 0.40 g, respectively;the volume of CH₃OH was 20 mL,and the sulfur was reduced from 1.420×10^-3 g/g to 1.75×10^-4 g/g,the desulfurization percentage was 88%;the reaction time was 20 min;and temperature should be controled under 15℃;the sulfur obtained by desulfurating benzothiophene was retained in active cobalt boride formed during the reaction.The proposed mechanism is that the reduction reaction occurred between CoCl₂·6H₂O and the reductant in protic solvent,then black cobalt boride and H₂ were formed;the hydrogenation desulfurization mechanism was deduced according the product distribution,and the reduction of benzothiophene was carried out through both the hydrogenation and direct hydrogenolysis routes;the substantive nascent hydrogen was absorbed and activated on the surface of the active solid,and was further transformed into transient intermediates,which attack the unsaturated bonds of benzothiophene and then led to the cleavage of C-S or C-C bond.
- reductive desulfurization,
- benzothiophene,
- reaction condition,
- reaction mechanism
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