Abstract
Abstract Hemicelluloses are the main organics dissolved in the pre-hydrolysis liquor (PHL) of the kraft-based dissolving pulp production process. In this study, two methods were employed to isolate the hemicelluloses from industrial PHL samples. The results showed that the hemicelluloses, precipitated in ethanol after an acidification step (Method 2), had a very high brightness (83% ISO) and low lignin content (0.44%) compared with the hemicelluloses obtained by the direct precipitation in ethanol without the acidification (Method 1), which had a brightness of 17.2% ISO and a lignin content of 5.67%. Furthermore, the hemicelluloses isolated via Method 2 were rendered cationic by using glycidyltrimethylammonium chloride (GTMAC), and the process parameters for the cationization reaction were studied, including the water content, reaction temperature and time, molar ratio of GTMAC/hemicelluloses, and the sodium hydroxide dosage. The optimized conditions for the cationic modification were 35% water content, 5% sodium hydroxide (both based on the mass of hemicelluloses), 1 (mol) GTMAC/hemicelluloses ratio, 65 °C, and 4 h reaction time. Finally, the cationic hemicelluloses were characterized and compared with unmodified hemicelluloses using the FT-IR and NMR analyses.
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.
