Oxidation of Aldoses Contained in Softwood Hemicellulose Acid Hydrolysates into Aldaric Acids under Alkaline or Noncontrolled pH Conditions - Institut de Chimie et Biochimie Moléculaires et Supramoléculaires Accéder directement au contenu
Article Dans Une Revue Industrial and engineering chemistry research Année : 2018

Oxidation of Aldoses Contained in Softwood Hemicellulose Acid Hydrolysates into Aldaric Acids under Alkaline or Noncontrolled pH Conditions

Résumé

The hemicellulose-derived aqueous solution of C6 and C5 sugars (D-mannose, D-galactose, D-glucose, D-xylose, L-arabinose), obtained from the extraction and hydrolysis of the hemicellulosic polymers in softwoods prior to the production of pulp, was catalytically converted to the corresponding aldaric acids under alkaline (Pt/C) or native (Au-Pt/ZrO2) aqueous conditions with air. The inhibiting effect of some residual impurities and degraded compounds in the hydrolysate was confirmed, such as colored unsaturated compounds and 5-hydroxymethylfurfural. A combined purification process consisting of filtration, demineralization by ion-exchange resins, evaporation, and active carbon treatment of the raw aqueous-stream gave a purified hydrolysate of aldoses that was oxidized to hexaric and pentaric acids. The yields were dose to those of a synthetic solution of the pure sugars with the same distribution. The yields of aldaric acids accounted for ca. 50% of hexaric acids and up to 70% of pentaric acids.
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hal-01779815 , version 1 (17-11-2021)

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Paternité - Pas d'utilisation commerciale

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Elie Derrien, Mohammed Ahmar, Emilie Martin-Sisteron, Guy Raffin, Yves Queneau, et al.. Oxidation of Aldoses Contained in Softwood Hemicellulose Acid Hydrolysates into Aldaric Acids under Alkaline or Noncontrolled pH Conditions. Industrial and engineering chemistry research, 2018, 57 (13), pp.4543-4552. ⟨10.1021/acs.iecr.8b00239⟩. ⟨hal-01779815⟩
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