Dissolution of chitin in aqueous KOH

被引：25
作者：
Gong, Pei [1 ,2 ]
Wang, Jian [1 ,2 ]
Liu, Biaolan [1 ,2 ]
Ru, Geying [1 ]
Feng, Jiwen [1 ]
机构：
[1] Chinese Acad Sci, Wuhan Inst Phys & Math, Natl Ctr Magnet Resonance Wuhan, State Key Lab Magnet Resonance & Atom & Mol Phys, Wuhan 430071, Peoples R China
[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China
来源：
CELLULOSE | 2016年 / 23卷 / 03期
基金：
中国国家自然科学基金;
关键词：
Chitin dissolution; KOH aqueous solution; Low temperature; NMR; CELLULOSE; NMR; DEACETYLATION; ACETYLATION; HYDROLYSIS; SOLUBILITY; CHITOSAN; CHLORIDE;
D O I：
10.1007/s10570-016-0932-z
中图分类号：
TB3 [工程材料学]; TS [轻工业、手工业、生活服务业];
学科分类号：
0805 ; 080502 ; 0822 ;
摘要：
Our NMR experiments show that chitin can dissolve well in aqueous KOH through a freeze-thawing process, and the dissolution power of the alkali solvent systems is in the order of KOH > NaOH > LiOH aqueous solution, which is totally contrary to that of cellulose in the alkali aqueous solution (i.e., LiOH > NaOH a parts per thousand << KOH). In this work, we systematically study the dissolution process in KOH and KOH/urea aqueous solutions. Chitin has good solubility (solubility similar to 80 %) in 8.4-25 wt% KOH aqueous solution at -30 A degrees C. The role of urea also has been investigated: unlike aqueous chitin-NaOH solutions, urea indeed enhances the solubility of chitin in KOH aqueous solutions, but the increased degree becomes unobtrusive with decreasing temperature and increasing dissolution time; the DA decline curves of chitin-KOH and chitin-KOH/urea aqueous solutions are nearly overlapping, indicating that the effect of the urea on the degree of acetylation of chitin in KOH aqueous solutions is small, similar to the NaOH/urea solvent.
引用
收藏
页码：1705 / 1711
页数：7
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