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Article Dans Une Revue Chemical Engineering Journal Année : 2023

Extraction of phenolic compounds from hydrothermal processing of black liquor: Effect of reactor type and pH of recovered liquid phase

Résumé

The goal of this work was to study the effect of pH on the extraction yield of phenolic compounds from liquid phases recovered after the hydrothermal treatment of black liquor in the batch and continuous reactors at 280 °C and 350 °C. The pH values of recovered liquid phases under investigation were adjusted to 9, 8, and 7. The liquid-liquid extraction was subsequently performed using ethyl acetate for 4 h at room temperature. The identification and quantification of phenolic products were conducted using GC-Mass analysis. The main monomeric compounds identified in the aqueous phase were phenol, guaiacol, and syringol. The results indicated that reducing the pH improved slightly the extraction of the phenol and guaiacol from the various recovered liquid phases after hydrothermal treatment. However, the extraction yield of syringol greatly improved by reducing the pH of liquid phases. This was very noticeable for the recovered liquid phases after treatment at 280 °C, where the quantity of syringol was initially high. Moreover, lower pH hinders the ethyl acetate hydrolysis during liquid-liquid extraction. The extraction experiments with various pH also confirmed the superior performance of the continuous reactor over the batch reactor to obtain the phenolic compounds. In addition, the phenolic products have been degraded with increasing treatment temperature from 280 °C to 350 °C.

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Chimie
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Dates et versions

cea-04275185 , version 1 (08-11-2023)

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Yahya Hamzeh, Christine Chirat, Geert Haarlemmer, Dominique Lachenal, Alireza Ashori, et al.. Extraction of phenolic compounds from hydrothermal processing of black liquor: Effect of reactor type and pH of recovered liquid phase. Chemical Engineering Journal, 2023, 470, pp.144269. ⟨10.1016/j.cej.2023.144269⟩. ⟨cea-04275185⟩
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