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- W4284688889 abstract "Black liquor, a side stream of the kraft pulping process, contains valuable low molecular weight carboxylic acids and carbohydrates. Hydrothermal treatment and wet oxidation of black liquor with a dry matter content of 43 % were investigated as an approach to convert these carbohydrates to carboxylic acids to increase their concentration. Wet oxidation with H 2 O 2 or O 2 at 115–185 °C led to partial degradation of carbohydrates, but no significant formation of the investigated carboxylic acids, glycolic, lactic, formic and acetic acid, was detected. Treatment under N 2 atmosphere at 185 and 220 °C finally led to an increase of the hydroxy acid concentration. After two hours of heat treatment at 220 °C, 90 % of the carbohydrates were degraded, coupled with a high carbon conversion efficiency of 32 % based on the formation of lactic acid and glycolic acid, of which the concentrations increased by 51 and 73 %, respectively. • Hydrothermal degradation and conversion of carbohydrates in kraft black liquor • Wet oxidation promotes carbohydrate conversion and reduces TOC. • Promoted wet oxidation with H 2 O 2 proceeds at room temperature and degrades xylans. • At high temperatures, carbohydrates are degraded to glycolic and lactic acid. • Carbon conversion efficiency of carbohydrates to hydroxy acids of 32 % at 220 °C" @default.
- W4284688889 created "2022-07-08" @default.
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- W4284688889 date "2022-09-01" @default.
- W4284688889 modified "2023-09-30" @default.
- W4284688889 title "Conversion of carbohydrates to carboxylic acids during hydrothermal and oxidative treatment of concentrated kraft black liquor" @default.
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- W4284688889 doi "https://doi.org/10.1016/j.biteb.2022.101148" @default.
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