Approach for promoting liquid yield in direct liquefaction of Shenhua coal

被引：64

作者：

Li, Xian ^{[1
]}

Hu, Haoquan ^{[1
]}

Jin, Lijun ^{[1
]}

Hu, Shuxun ^{[1
]}

Wu, Bo ^{[1
]}

机构：

[1] Dalian Univ Technol, Inst Coal Chem Engn, State Key Lab Fine Chem, Dalian 116012, Peoples R China

来源：

FUEL PROCESSING TECHNOLOGY | 2008年 / 89卷 / 11期

基金：

中国国家自然科学基金;

关键词：

Coal liquefaction; Multi-stage; Residue;

D O I：

10.1016/j.fuproc.2008.05.003

中图分类号：

O69 [应用化学];

学科分类号：

081704 ;

摘要：

Single and multi-stage liquefaction of Shenhua (SH) bituminous coal and re-liquefaction of its liquefaction residue (SHLR) were carried out in an autoclave reactor to investigate the essential approach for promoting oil yield and conversion in SH coal direct liquefaction (SHDL). The multi-stage liquefaction includes pretreatment, keeping the reactor at 250 degrees C for 40 min before heating up to the reaction temperature, and two-stage liquefaction processes consisting of low temperature stage, 400 degrees C, and high temperature stage, 460 degrees C. The results show that the pretreatment has slight effect on oil yield and conversion of SHDL, especially for liquefaction at 460 degrees C. There is a positive function of two-stage liquefaction in shortening reaction time at high temperature. Increasing ratio of solvent to SHLR can promote the oil yield and abate reaction condition in SHLR re-liquefaction, that is, it can promote the conversion from preasphaltene and asphaltene to oil. The primary factor to inhibit coal liquefaction is the consumption of hydrogen free radical (H.) from solvent or H-2 and condensation of free radicals from coal pyrolysis after a period of reaction. So the essential approach for increasing oil yield and conversion of SHDL is to provide enough H. to stabilize the free radicals from coal pyiolysis. (C) 2008 Elsevier B.V. All rights reserved.

引用

页码：1090 / 1095

页数：6

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