Paper making and fiber liberation – Processes of chemical liberation – recovery or purification... – With chemical or physical modification of liberated fiber
Patent
1990-10-17
1991-08-06
Alvo, Steve
Paper making and fiber liberation
Processes of chemical liberation, recovery or purification...
With chemical or physical modification of liberated fiber
162 23, 1621576, 162207, 536 69, 536 70, C08B 306, D21C 112
Patent
active
050369008
ABSTRACT:
Cellulosic sheet material is processed in preparation for esterification for example acetylation to produce cellulose acetate, by treating the sheet material with water and then feeding the wetted material into a machine that simultaneously shreds and dries the material. The conditions in the machine are carefully controlled (outlet temperature not in excess of 110.degree. C. and moisture content 4-15% by weight) to ensure that the cellulosic material does not become deactivated towards esterification. The method enables low alpha content cellulosic material supplied in the form of high density sheet to be acetylated to produce high quality cellulose acetate flake.
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Nelson et al., "Activation of Cellulose for Acetylation by Mechanical Refining in Acetic Acid", Tappi Dissolving Pulp Conference, 1973, pp. 69-82.
Tedesco et al., "Effect of Pulp Alpha Content on Acetate End-Use Properties--Possible Techniques to Allow Greater Utilization of Lower Alpha Pulps for Acetate Production", Tappi Dissolving Pulp Conference, 1977, pp. 84-87.
Burley Richard
Slota Lucjan S.
Alvo Steve
Courtaulds PLC
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