Effect of pH on Kraft Lignin Depolymerisation in Subcritical Water

被引：34

作者：

Belkheiri, Tallal ^{[1
]}

Mattsson, Cecilia ^{[2
]}

Andersson, Sven-Ingvar ^{[1
]}

Olausson, Lars ^{[3
]}

Amand, Lars-Erik ^{[1
]}

Theliander, Hans ^{[2
]}

Vamling, Lennart ^{[1
]}

机构：

[1] Chalmers Univ Technol, Environm & Energy Dept, SE-41296 Gothenburg, Sweden

[2] Chalmers Univ Technol, Dept Chem & Chem Engn, SE-41296 Gothenburg, Sweden

[3] Valmet AB, Box 8734, SE-40275 Gothenburg, Sweden

来源：

ENERGY & FUELS | 2016年 / 30卷 / 06期

关键词：

CATALYTIC DEPOLYMERIZATION; ALKALI LIGNIN; DEGRADATION; CONVERSION; CHEMICALS; HYDROGEN;

D O I：

10.1021/acs.energyfuels.6b00462

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：

Softwood kraft lignin was depolymerized using subcritical water (623 K and 25 MPa) in a continuous small pilot unit. ZrO2 and K2CO3 were used as catalysts, and phenol was used as capping agent to suppress repolymerization. The effect of pH was investigated by adding KOH in five steps to the feed. The yield of water-soluble organics increased with pH. The yield of bio-oil was also influenced by the pH and varied between 28 and 32 wt %. The char yield on the zirconia catalyst showed a minimum at pH 8.1. The yield of suspended solids was low at pH below 8.1 but increased at higher pH values. The oxygen content in the bio-oil was only 15 wt %, compared to about 26 wt % in the kraft lignin.

引用

页码：4916 / 4924

页数：9

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