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• W4383558102 abstract "Hydrothermal liquefaction (HTL) is a promising process for the energetic valorization of low-value feedstocks. However, HTL crude oils are incompatible with the existing fuel standards, making their upgrade imperative. Nonetheless, the hydrotreatment (HDT) of HTL crude oils is still a challenge due to the complex nature of the feedstock. Therefore, this work explores the relationship between the HTL crude oil origin and the HDT conversion. Five HTL crude oils from different feedstocks, namely, oak sawdust, Brewer’s Spent Grain (spent grain), sewage sludge from two origins, and lignite, and their detailed characterization by elemental analysis, 13C and 31P NMR, molecular weight distribution, comprehensive 2D gas chromatography, and SimDis were compared to those of the HDT liquid product. Lignite displayed the highest potential for producing hydrocarbons, particularly monoaromatics and naphthenes, among the feedstocks tested. The capacity of lignite HTL crude oil to be transformed into hydrocarbons was associated with the absence of compounds resistant to HDT in this feedstock. Similarly, oak sawdust also displayed higher selectivity toward aromatic and naphthene hydrocarbons due to the significant concentration of aromatic compounds in the crude oil. In opposition, the sewage sludge and spent-grain crude oils were particularly selective toward aliphatic hydrocarbons, particularly paraffins, produced from aliphatic components, such as amides, in the crude oil. However, these feedstocks were rich in nitrogenated aromatics, for example, carbazole, which are recalcitrant to hydrotreatment and were not fully converted during the reaction. The differences observed in the HDT liquid composition show that the HTL crude oil composition dictates the potential for producing hydrocarbon fuels. Indeed, HTL crude oils rich in aromatic compounds will yield preferentially naphthenes and aromatic hydrocarbons. In opposition, crude oils richer in aliphatic carbon will be more selective toward paraffins. The nature and concentration of heteroatom components must also be considered since these must be imperatively eliminated." @default.
• W4383558102 created "2023-07-08" @default.
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• W4383558102 date "2023-07-07" @default.
• W4383558102 modified "2023-09-25" @default.
• W4383558102 title "Lignite and Biomass Waste Hydrothermal Liquefaction Crude Upgrading by Hydrotreatment" @default.
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• W4383558102 doi "https://doi.org/10.1021/acs.energyfuels.3c01550" @default.
• W4383558102 hasPublicationYear "2023" @default.
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