Study on two-step hydrothermal liquefaction of macroalgae for improving bio-oil

Wang, Shuang; Zhao, Shuang; Cheng, Xiaonong; Qian, Lili; Barati, Bahram; Gong, Xun; Cao, Bin; Yuan, Chuan

doi:10.1016/j.biortech.2020.124176

Cited by 104 publications

(28 citation statements)

References 47 publications

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“… 14 It can be seen from Table S4 † that antibiotic residue contains much less carbohydrate and ester substances than algae, so more ether bonds, and hydroxyl groups are needed to provide free radicals. 44 The region of 4.4–6.0 ppm corresponds to the hydrogen of the methoxyl group, showing that there are a large number of hydrogen atoms containing aromatic ethers protons and carbohydrate molecules. These substances are intermediate products in the hydrothermal liquefaction process.…”

Section: Resultsmentioning

confidence: 99%

Study on the hydrothermal liquefaction of antibiotic residues with molecular sieve catalysts in the ethanol–water system: focus on product distribution and characterization

et al. 2021

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Section: Resultsmentioning

confidence: 99%

Study on the hydrothermal liquefaction of antibiotic residues with molecular sieve catalysts in the ethanol–water system: focus on product distribution and characterization

et al. 2021

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“…Fossil fuels are used to produce energy worldwide, but they come with major problems such as global warming (Zhang and Liu 2021 ). To reduce the use of fossil fuels, biomass-based fuels offer a great potential alternative since biomass is one of the most promising renewable and sustainable energy resources (Houshfar et al 2014 ; Singh and Dhepe 2018 ; Wang et al 2021 ) While biomass waste has increased markedly due to the intensification of agricultural and industrial activities to serve a growing population, its disposal, utilization, and management practices are not efficiently employed (Tripathi et al 2019 ). Biomass waste is usually discarded to degrade or to be burned in open areas, resulting in haze that harms the local environment (Madhu et al 2018 ).…”

Section: Introductionmentioning

confidence: 99%

Conversion of tobacco processing waste to biocrude oil via hydrothermal liquefaction in a multiple batch reactor

Saengsuriwong

Onsree

Phromphithak

et al. 2021

Clean Techn Environ Policy

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Graphic abstract Fossil fuels are the primary energy source of almost all societies and economies, but it is finite and scarce. The use of non-renewable fossil fuels threatens earth’s environment. At the same time, waste from agricultural and industrial activities is increasing. Most of this waste is discarded or poorly managed, causing many other environmental issues. Converting waste to energy is a promising route to address these challenges. We investigated the hydrothermal liquefaction (HTL) of high moisture content, tobacco-processing waste in a multiple batch thermal reactor to produce biocrude oil. The effects of operating conditions were studied and optimized for maximum liquid biocrude oil yield. HTL operating conditions considered were temperatures from 280 to 340 °C and residence times from 15 to 45 min for a fixed ratio of biomass to deionized water of 1:3. The reaction temperature was found to affect the yields and distribution of products significantly. The maximum yield of the liquid biocrude oil obtained was more than 52% w/w at 310 °C and 15 min. Under these conditions, almost 90% of the energy was recovered in biocrude oil and solid products. The liquid fraction was mainly composed of phenols, ketones, and nitrogenous compounds. This study provides a potential framework for eco-technologies for biomass waste-to-energy conversion with respect to converting tobacco processing residues to liquid biofuels and biochemicals.

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“…Biomass is the fourth largest energy source after coal, oil, and natural gas 7 . Several technologies have been developed to convert biomass into renewable fuels, feedstuffs, multifunctional materials, and platform chemicals 8–11 . Pyrolysis, which refers to a heating process in an oxygen‐free atmosphere, has many advantages at feedstock flexibility, high conversion rate, industrial production 12 .…”

Section: Introductionmentioning

confidence: 99%

“…7 Several technologies have been developed to convert biomass into renewable fuels, feedstuffs, multifunctional materials, and platform chemicals. [8][9][10][11] Pyrolysis, which refers to a heating process in an oxygen-free atmosphere, has many advantages at feedstock flexibility, high conversion rate, industrial production. 12 Thus, pyrolysis is one of the most popular methods of biomass conversion, and produces a series of valuable fuels and chemicals.…”

Section: Introductionmentioning

confidence: 99%

Study on the pyrolysis mechanism of unsaturated fatty acid: A combined density functional theory and experimental study

Jiang

Yuan

Cheng

et al. 2021

Intl J of Energy Research

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Summary In this study, oleic acid was used as a model compound to discuss the mechanism of thermal conversion of unsaturated fatty acids to hydrocarbons, so as to promote the goal of obtaining renewable chemicals and fuels from unsaturated fatty acids. In‐situ detection techniques such as TG‐FTIR and Py‐GC/MS combined with density functional theory were applied to study the reaction mechanism of oleic acid molecules in the conditions of slow pyrolysis and fast pyrolysis. As the temperature rises, the hydrogen bond is broken, and the vibration peak of oleic acid shows obvious dehydrogenation under slow pyrolysis, and the same situation exists under fast pyrolysis. As the temperature increases, the pyrolysis process of oleic acid molecules changed from the dominant role of bimolecular mutual catalysis to that of free radical reaction. The results of Py‐GC/MS showed that methyl, ethyl, and hydrogen radicals are the main active substances under the conditions of high temperature and fast pyrolysis of unsaturated fatty acid. This work demonstrates the feasibility of producing renewable hydrocarbons by pyrolysis of unsaturated fatty acids and proposed influenced factors to control product distribution. Novelty Statement Density functional theory (DFT) combined with experiments was used in present study to supplement the understanding of the pyrolysis mechanism of fatty acids in bio oil pyrolysis, and the control factors of controlling the distribution of fatty acid pyrolysis products were proposed.

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Study on two-step hydrothermal liquefaction of macroalgae for improving bio-oil

Cited by 104 publications

References 47 publications

Study on the hydrothermal liquefaction of antibiotic residues with molecular sieve catalysts in the ethanol–water system: focus on product distribution and characterization

Study on the hydrothermal liquefaction of antibiotic residues with molecular sieve catalysts in the ethanol–water system: focus on product distribution and characterization

Conversion of tobacco processing waste to biocrude oil via hydrothermal liquefaction in a multiple batch reactor

Study on the pyrolysis mechanism of unsaturated fatty acid: A combined density functional theory and experimental study

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