Hydrothermal liquefaction of sewage sludge to produce bio-oil: Effect of co-pretreatment with subcritical water and mixed surfactants

2019 ◽  
Vol 144 ◽  
pp. 28-38 ◽  
Author(s):  
Tianhua Yang ◽  
Xingshuang Liu ◽  
Rundong Li ◽  
Bingshuo Li ◽  
Xingping Kai
Keyword(s):  
Sewage Sludge ◽  
Subcritical Water ◽  
Hydrothermal Liquefaction ◽  
Mixed Surfactants ◽  
Bio Oil

Co-hydrothermal liquefaction of microalgae and sewage sludge in subcritical water: Ash effects on bio-oil production

2019 ◽  
Vol 138 ◽  
pp. 1143-1151 ◽  
Author(s):  
Donghai Xu ◽  
Yang Wang ◽  
Guike Lin ◽  
Shuwei Guo ◽  
Shuzhong Wang ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Subcritical Water ◽  
Oil Production ◽  
Hydrothermal Liquefaction ◽  
Bio Oil

Bio oil production from microalgae via hydrothermal liquefaction technology under subcritical water conditions

2018 ◽  
Vol 153 ◽  
pp. 108-117 ◽  
Author(s):  
P. Kiran Kumar ◽  
S. Vijaya Krishna ◽  
Kavita Verma ◽  
K. Pooja ◽  
D. Bhagawan ◽  
...  
Keyword(s):  
Subcritical Water ◽  
Oil Production ◽  
Hydrothermal Liquefaction ◽  
Bio Oil ◽  
Water Conditions

scholarly journals Accelerated aging of bio-oil from lignin conversion in subcritical water

TAPPI Journal ◽  
2017 ◽  
Vol 16 (03) ◽  
pp. 123-141 ◽  
Author(s):  
Huyen Nguyen Lyckeskog ◽  
Cecilia Mattsson ◽  
Lars Olausson ◽  
Sven-Ingvar Andersson ◽  
Lennart Vamling ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Nuclear Magnetic Resonance ◽  
Magnetic Resonance ◽  
Aging Process ◽  
Subcritical Water ◽  
Accelerated Aging ◽  
Weight Fraction ◽  
Hydrothermal Liquefaction ◽  
Bio Oil ◽  
Nuclear Magnetic

Accelerated aging of bio-oil derived from lignin was investigated at different aging temperatures (50°C and 80°C) and times (1 hour, 1 day, 1 week, and 1 month). The bio-oil used was produced by the hydrothermal liquefaction of kraft lignin, using phenol as the capping agent, and base (potassium carbonate and potassium hydroxide) and zirconium dioxide as the catalytic system in subcritical water. Elemental composition, molecular weight (by using gel permeation chromatography), and chemical composition (by using gas chromatography–mass spectrometry and 2D nuclear magnetic resonance [18.8 T, DMSO-d6]) of the bio-oil were measured to gain better understanding of the changes that occurred after being subjected to an accelerated aging process. The ligninderived hydrothermal liquefaction bio-oil was quite stable compared with biomass-pyrolysis bio-oil. The yield of the low molecular weight fraction (light oil) decreased from 64.1% to 58.1% and that of tetrahydrofuran insoluble fraction increased from 16.5% to 22.2% after aging at 80°C for 1 month. Phenol and phenolic dimers (Ar–CH2–Ar) had high reactivity compared with other aromatic substituents (i.e., methoxyl and aldehyde groups); these may participate in the polymerization/condensation reactions in the hydrothermal liquefaction bio-oil during accelerated aging. Moreover, the 2D heteronuclear single quantum coherence nuclear magnetic resonance spectra of the high molecular weight fraction (heavy oil) in the aged raw oil in the aromatic region showed that the structure of this fraction was a combination of phenol-alkyl patterns, and the guaiacol cross-peaks of Ar2, Ar5, and Ar6 after aging indicate that a new polymer was formed during the aging process.

scholarly journals Lignocellulosic and algal biomass for bio-crude production using hydrothermal liquefaction: Conversion techniques, mechanism and process conditions: A review

2021 ◽  
Vol 27 (1) ◽  
pp. 200555-0
Author(s):  
Chitra Devi Venkatachalam ◽  
Sathish Raam Ravichandran ◽  
Mothil Sengottian
Keyword(s):  
Algal Biomass ◽  
Subcritical Water ◽  
Energy Resource ◽  
Value Added ◽  
Hydrothermal Liquefaction ◽  
Thermochemical Conversion ◽  
Process Conditions ◽  
Operating Parameters ◽  
Bio Oil ◽  
First And Second Generation

Thermochemical conversion is an effective process in production of biocrude. It mainly includes techniques such as torrefaction, liquefaction, gasification and pyrolysis in which Hydrothermal Liquefaction (HTL) has the potential to produce significant energy resource. Algae, one of the third-generation feedstocks is placed in the top order for production of bio-oil compared to the first and second-generation feedstock, as the algae can get multiplied in shorter time with the uptake of greenhouse gases. In HTL, the subcritical water helps the biomass to undergo thermal depolymerisation and produce various chemicals such as nitrogenates, alkanes, phenolics, esters, etc. The produced “biocrude” or “bio-oil” may be further upgraded into value-added chemicals and fuels. In addition, the bio-gas and bio-char are also synthesized as by-products. This review provides an overview of different routes available for thermochemical conversion of biomass. It also provides an insight on the operating parameters such as temperature, pressure, dosage of catalyst and solvent for lignocellulosic and algal biomass under HTL environment. In extent, the article covers the conversion mechanism for these two feedstocks and also the effects of the operating parameters on the yield of biocrude are studied in detail.

Supported Fe 2 O 3 nanoparticles for catalytic upgrading of microalgae hydrothermal liquefaction derived bio-oil

2017 ◽  
Vol 293-294 ◽  
pp. 159-166 ◽  
Author(s):  
Junjie Bian ◽  
Qi Zhang ◽  
Peng Zhang ◽  
Lijuan Feng ◽  
Chunhu Li
Keyword(s):  
Hydrothermal Liquefaction ◽  
Catalytic Upgrading ◽  
Bio Oil
Sign in / Sign up

Export Citation Format

Share Document