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Scientific Publishing Center
Document Details
Document Type
:
Article In Journal
Document Title
:
Role of Ethoxide Ion in Soda-Ethanol Pulping of Egyptian Bagasse
دراسة دور ايون الإيثوكسيد في التلبيب بالصودا - إيثانول لإنتاج انواع مختلفة من لب السليلوز
Subject
:
Chemistry
Document Language
:
English
Abstract
:
Role of ethoxide ion in alkaline-ethanol pulping was studied by the application of mild soda pulping conditions to prehydrolysed bagasse and monitoring the changes in pulp properties as a function of the concentration of ethanol. Low concentration levels of ethoxide resulted in the cellulose supramolecular structure to become more amorphous and enhanced dissolution of shortchain carbohydrates by increasing the susceptibility of the pulp towards alkali. Thus, high-alpha pulp with improved accessibility and chemical reactivity to xanthation were obtained. Higher ethoxide concentration levels decreased the degree of pulping {de lignification), lowered the alpha-cellulose content and decreased the accessibility of the pulp. These effects are attributed to a combination of: a) degradation of long-chain alpha-cellulose, b) the inability of ethoxide ion, compared to hydroxide ion to penetrate into the original native structure of the fibres thus leading to insufficient degree of pulping and, c) the self-condensation of lignin, catalysed by ethoxide ion. The addition of anthraquinone (AQ) to the alkaline ethanol pulping liquors. permitted the retention of different amounts of hemicellulose and lignin.
ISSN
:
1012-1319
Journal Name
:
Science Journal
Volume
:
8
Issue Number
:
1
Publishing Year
:
1416 AH
1996 AD
Number Of Pages
:
6
Article Type
:
Article
Added Date
:
Sunday, October 11, 2009
Researchers
Researcher Name (Arabic)
Researcher Name (English)
Researcher Type
Dr Grade
Email
سامية عبدالحليم حلمي
SAMIA A. HELMY
Researcher
ياسين الدسوقي عبدالباقي
YASMEEN EL-DOSOAKY ABDELBAKY
Researcher
Files
File Name
Type
Description
22587.pdf
pdf
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