Potassium acetate-catalyzed acetylation of wood at low temperatures I: simplified method using a mixed reagent

Autor:	Kazuya Minato, Eiichi Obataya
Rok vydání:	2009
Předmět:	Chromatography Potassium chemistry.chemical_element Catalysis Biomaterials Acetic anhydride chemistry.chemical_compound Acetic acid chemistry Acetylation Reagent medicine Swelling medicine.symptom Mass fraction
Zdroj:	Journal of Wood Science. 55:18-22
ISSN:	1611-4663 1435-0211
DOI:	10.1007/s10086-008-0995-z
Popis:	Ezomatsu wood blocks were acetylated in a mixture of acetic anhydride and acetic acid containing excess potassium acetate (KAc). The mixture method enabled rapid acetylation at 120°C: a 20% weight gain (weight percent gain; WPG) was achieved within 30 min while the WPG did not exceed 18% after 120 min of conventional uncatalyzed acetylation. At 40°C, however, a satisfactory WPG was not achieved with the mixture method because both the wood swelling and KAc concentration in the reagent solution were limited at that temperature. In addition, the antiswelling efficiency attained by the mixture method was irregularly low, probably because of nonuniform reaction involving shrinkage of the cell lumina. These results suggest that the mixture method is not advantageous for low-temperature acetylation, whereas it enables simple and rapid acetylation at high temperature.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::38d4f43769adf3a8e8addeda6c8ade72 https://doi.org/10.1007/s10086-008-0995-z Zobrazit plný text záznamu Full text from SpringerLink