High-yield and high-calorific bio-oil production from concentrated sulfuric acid hydrolysis lignin in supercritical ethanol

被引：96
作者：
Riaz, Asim [1 ]
Kim, Chang Soo [2 ]
Kim, Yunje [2 ]
Kim, Jaehoon [1 ,3 ]
机构：
[1] Sungkyunkwan Univ, Sch Mech Engn, 2066 Seobu Ro, Suwon 440746, Gyeong Gi Do, South Korea
[2] Korea Inst Sci & Technol, Clean Energy Res Ctr, Hwarangno 14 Gil 5, Seoul 136791, South Korea
[3] Sungkyunkwan Univ, SAINT, 2066 Seobu Ro, Suwon 440746, Gyeong Gi Do, South Korea
来源：
FUEL | 2016年 / 172卷
关键词：
Concentrated sulfuric acid hydrolysis lignin; Supercritical ethanol; Formic acid; Liquefaction; Hydrodeoxygenation; KRAFT LIGNIN; FAST PYROLYSIS; CATALYTIC DEPOLYMERIZATION; ORGANOSOLV LIGNIN; LIQUID FUEL; CONVERSION; CHEMICALS; DEGRADATION; WATER; METHYLATION;
D O I：
10.1016/j.fuel.2015.12.051
中图分类号：
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号：
0807 ; 0820 ;
摘要：
The aim of this work is to explore process parameters (pressure, time, formic acid content) for producing high-yield and high-calorific bio-oil from concentrated sulfuric acid hydrolysis lignin (CSAHL) with formic acid as an in-situ hydrogen source in supercritical ethanol (scEtOH). Even at short reaction time of 30 min, high conversion of 92% and high bio-oil yield of 85 wt% were observed at 350 degrees C and formic-acid-to-lignin mass ratio of 1.5 using a stirred reactor. The effective deoxy-liquefaction nature associated with scEtOH with aid of formic acid resulted in significant reduction in oxygen content of 44% and high higher heating value of 31.2 MJ kg(-1) of produced bio-oil. The overall process is energetically efficient with 112% energy recovery (ER) and 78% energy efficiency (EE). The results are compared with Kraft lignin (KL) under identical reaction conditions. The inherent recalcitrant nature of CSAHL resulted in lower conversion and lower bio-oil yield when compared to the liquefaction of Kraft lignin (KL, 99% conversion, 90 wt% bio-oil yield). Bio-oil with better flow properties, low molecular weight, and a high amount of monomeric phenol was produced after 60 min of reaction. The compounds in the bio-oil were mainly phenols, esters, furans, alcohols, and traces of aliphatic hydrocarbons. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：238 / 247
页数：10
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