Cellulose degradation in alkaline media upon acidic pretreatment and stabilisation
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- 作者：Lidia Testova ; Kaarlo Nieminen ; Paavo A. Penttil盲 ; Ritva Serimaa ; Antje Potthast ; Herbert Sixta
- 关键词：AQ ; anthraquinone ; AQS ; anthraquinone-2-sulphonic acid sodium salt ; BCA ; 2 ; 2&prime ; -bicinchoninate ; BH ; sodium borohydride ; CL ; cotton linters ; OA ; oxalic acid ; REG ; reducing end group
- 刊名：Carbohydrate Polymers
- 出版年：16 January, 2014
- 年：2014
- 卷：100
- 期：Complete
- 页码：185-194
- 全文大小：1010 K
文摘
The present study reports on a revised kinetic model for alkaline degradation of cellulose accounting for primary peeling/stopping reactions as well as for alkaline hydrolysis followed by secondary peeling. Oxalic acid pretreated cotton linters was utilised as the model substrate for the prehydrolysis-soda anthraquinone process. The main emphasis was investigating the effect of end-group stabilising additives such as sodium borohydride (BH), anthraquinone (AQ), and anthraquinone-2-sulphonic acid sodium salt (AQS) on the rates of the yield loss reactions. BH and AQS ensured a cellulose yield gain of 13% and 11%, respectively, compared to the reference. Both stabilisation agents decreased the content of the reducing end groups in the samples, while in the case of AQS stabilisation a 25% increase in carboxyl group content compared to the reference was also observed. As expected, the addition of end group stabilisers resulted in a significant decrease in the peeling-to-stopping rate constants ratio.