Preparation of wood pulps with caustic pretreatment for use in the manufacture of cellulose acetates and other organic esters
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United States of America Patent
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Issued Date -
Dec 21, 2006
app pub date -
Jun 16, 2005
filing date -
Jun 16, 2005
priority date (Note) -
Abandoned
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Abstract
A process for making cellulose acetate or cellulose esters which pretreats a wood pulp prior to acetylation or esterification is disclosed. The pretreatment of the wood pulp includes the mixture of wood pulp into a caustic solution to form a suspension of wood pulp. The suspension of wood pulp is separated from the caustic solution to form a cake. The cake is washed with an acid to obtain an acid and cellulose cake having a low water content. The acid and cellulose cake is then acetylated or esterifed to form cellulose acetate or other cellulose esters.
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