Abstract
The hydrolysate recovered after acid hydrolysis of the hemicellulose fraction of softwood represents a renewable and low-cost source of sugars which can be used for the production of chemicals such as glucaric acid. In this paper we first re-evaluated the metal-catalyzed aerobic oxidation of gluconate and one-step oxidation of glucose to glucarate in alkaline aqueous solution at 60 °C using air as oxidant. Then, we investigated the possible inhibitory effect of some inherent side (or by)-products liberated during the dilute mineral acid hydrolysis. High conversion efficiencies were obtained in glucose oxidation; however, the maximum glucarate yield was 54% over Pt/C since overoxidation products were formed under these conditions. As regards the residues in the hydrolysate, sodium salts (acetate and sulfate) or disaccharides (cellobiose and maltose) were without significant effect on the course of the reaction, whereas furan aldehydes (5-hydroxymethylfurfural and furfural) appeared to significantly slow do...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
