The Effect of Different Catalysts and Process Parameters on the Chemical Content of Bio-oils from Hydrothermal Liquefaction of Sugarcane Bagasse

Yan, Xiaojin; Ma, Jiuli; Wang, Wei; Zhao, Yanan; Zhou, Jinghui

doi:10.15376/biores.13.1.997-1018

Cited by 21 publications

(17 citation statements)

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“…This yield is lower than the ∼13 wt % yields reported previously for isothermal HTL of pectin at 350 °C but with 5 wt % biomass loading . The biocrude yield from HTL being lower with a higher feedstock loading (20 wt % in this case) is consistent with prior work on HTL of a polysaccharides. ,, …”

Section: Resultssupporting

confidence: 88%

“…15 The biocrude yield from HTL being lower with a higher feedstock loading (20 wt % in this case) is consistent with prior work on HTL of a polysaccharides. 14,19,20 HTL of pectin with added K 2 HPO 4 and KH 2 PO 4 led to lower mean biocrude yields of 6.9 and 8.6 wt %, respectively. In contrast, the biocrude yield (11 wt %) with added K 3 PO 4 was higher than it was without additive.…”

Section: Resultsmentioning

confidence: 97%

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Effects of Potassium Phosphates and Other Additives on Biocrude Production and Composition from Hydrothermal Liquefaction of Pectin and Chitin

Ding

Subramanya

Wang

et al. 2021

Ind. Eng. Chem. Res.

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We determined the influence of added potassium phosphates, Na 2 CO 3 , and KOH on the product distribution and characteristics of the biocrude from the hydrothermal liquefaction (HTL) of pectin and chitin. Added K 3 PO 4 and KOH provided a significant positive effect (30−70% increase) on the biocrude yields from HTL of both polysaccharides. These basic conditions resulted in a higher biocrude yield, whereas acidic conditions (added KH 2 PO 4 ) reduced the yields of biocrude relative to the control experiment. HTL with basic additives increased both the H/C and O/C atomic ratios relative to the control experiments, and the higher O/C ratios for chitin HTL were sufficient to reduce the heating values of these biocrudes. Addition of K 3 PO 4 led to a larger fraction of low-boiling compounds being present in the biocrude from HTL of chitin, which is a desirable outcome. Taken collectively, the results show that additives can be used to increase biocrude yields and engineer HTL outcomes, to an extent, for valorization of these abundant polysaccharide renewable resources.

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Section: Resultssupporting

confidence: 88%

Section: Resultsmentioning

confidence: 97%

Effects of Potassium Phosphates and Other Additives on Biocrude Production and Composition from Hydrothermal Liquefaction of Pectin and Chitin

Ding

Subramanya

Wang

et al. 2021

Ind. Eng. Chem. Res.

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“…We reported a similar decrease in the yield of biocrude (from ∼13 to ∼5 wt %) from HTL of potato starch when the loading increased from 2 to 15 wt % during isothermal HTL at 290 °C for 30 min. 19 Likewise, Yan et al 46 reported a decrease in oil yield with increasing biomass loading for isothermal HTL of sugar cane bagasse, which is ∼64 wt % polysaccharide (cellulose and hemicellulose).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Biocrude Production from Fast and Isothermal Hydrothermal Liquefaction of Chitin

Gollakota

Savage

2019

Energy Fuels

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We conducted isothermal and fast hydrothermal liquefaction (HTL) of chitin and determined the effects of temperature, holding time, and chitin wt % loading on product fraction yields and biocrude quality. Increasing the chitin loading from 1 to 15 wt % during isothermal HTL at 350 °C decreased the biocrude yield from 22 wt % to 10 wt %, increased the solids yield from 4 wt % to 16 wt %, and increased the nitrogen content in the biocrude. Increasing the chitin loading during fast HTL at a 500 °C set point temperature for 1 min, however, resulted in little variation in the biocrude and solids yields but again increased the nitrogen content. Fast HTL at this condition resulted in higher biocrude yields and higher energy recovery than did isothermal HTL under all tested chitin loadings. Fast HTL provides the opportunity to process chitin at high loadings (15 wt %) and achieve the highest available biocrude yields and energy recovery in the biocrude. Thermogravimetric analysis indicated a higher fraction of heavy components in the biocrude from isothermal HTL of chitin than from fast HTL. Ketones were abundant in the biocrude from isothermal HTL, and the biocrude from fast HTL was rich in nitrogen-containing compounds.

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“…The literature on HTL of polysaccharides indicates that added acids , decrease oil yields, whereas added bases ,− increase oil yields. Acidic conditions promote decarboxylation and cracking reactions, which lead to lower oil yields and more gases .…”

Section: Resultsmentioning

confidence: 99%

Effects of Potassium Phosphates on Hydrothermal Liquefaction of Triglyceride, Protein, and Polysaccharide

et al. 2020

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Three different potassium phosphates (KH 2 PO 4 , K 2 HPO 4 , and K 3 PO 4 ) were tested as potential homogeneous catalysts for the hydrothermal liquefaction of soybean oil, soy protein, potato starch, microcrystalline cellulose, and their mixture. Na 2 CO 3 and KOH, which have been widely applied in hydrothermal liquefaction (HTL) reactions, were also investigated for comparison to phosphates. The addition of K 2 HPO 4 and K 3 PO 4 , which form basic solutions, led to yields of biocrude from HTL of starch and cellulose that were sometimes 2−5 times higher than those without phosphates. Adding Na 2 CO 3 , which also forms a basic solution, for HTL of polysaccharides also generated higher biocrude yields but not as high as those obtained with added phosphates. The use of KOH (another base) resulted in the highest yield of biocrude from HTL of the mixture. These additives, along with Na 2 CO 3 , also resulted in less solid residue being produced. The additives had almost no positive effect, however, on biocrude production from HTL of soybean oil or soy protein. The biocrudes produced from polysaccharides with added K 2 HPO 4 , K 3 PO 4 , and Na 2 CO 3 have larger heating values and greater energy recoveries. The biocrudes mainly consist of acids/esters, alcohols, phenols, and ketones/aldehydes. The addition of phosphates led to a higher proportion of ketones/aldehydes at the expense of alcohols.

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The Effect of Different Catalysts and Process Parameters on the Chemical Content of Bio-oils from Hydrothermal Liquefaction of Sugarcane Bagasse

Cited by 21 publications

References 0 publications

Effects of Potassium Phosphates and Other Additives on Biocrude Production and Composition from Hydrothermal Liquefaction of Pectin and Chitin

Effects of Potassium Phosphates and Other Additives on Biocrude Production and Composition from Hydrothermal Liquefaction of Pectin and Chitin

Biocrude Production from Fast and Isothermal Hydrothermal Liquefaction of Chitin

Effects of Potassium Phosphates on Hydrothermal Liquefaction of Triglyceride, Protein, and Polysaccharide

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