首页   按字顺浏览 期刊浏览 卷期浏览 The Role of Carbohydrates in Alkali Anthraqutnone Pulping
The Role of Carbohydrates in Alkali Anthraqutnone Pulping

 

作者: Tapani Vuorinen,  

 

期刊: Journal of Wood Chemistry and Technology  (Taylor Available online 1993)
卷期: Volume 13, issue 1  

页码: 97-125

 

ISSN:0277-3813

 

年代: 1993

 

DOI:10.1080/02773819308020509

 

出版商: Taylor & Francis Group

 

数据来源: Taylor

 

摘要:

The reactions of carbohydrates with anthraquinones in alkaline pulping processes are reviewed. AQ reacts mainly with the short-lived intermediates that are formed in the degradation reactions of wood polysaccharides. Oxidation of the reducing end groups of polysaccharides to stable aldonic acid end groups is marginal and corresponds to less than 1 % of all reactions of AQ. The stabilization of the polysaccharides may be enhanced by the use of salts of alkaline earth metals which increase the relative oxidation rate of sugar enediols and promote the hydride shift reaction of the intermediate aldos-2-ulose end groups to stable hexonic acid end groups. Analysis of the monomeric carbohydrate-derived oxidation products indicates that hardwood lignin probably contains more structures that react with anthrahydroquinone than does softwood lignin. This difference may partly explain the more facile delignification of hardwoods.

 

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