Process for extracting water and acetic acid from the aqueous phase of cellulose acetate
AssigneeSinco Engineering S.p.A.
InventorsHussain Al Ghatta, Arianna Giovannini
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Abstract
A new process has been developed for separating the water and acetic acid present in the aqueous phase contained in cellulose acetate flakes precipitated from esterification solutions of cellulose. The process includes the step of simultaneously extracting water and acetic acid from the aqueous phase with supercritical carbon dioxide until the content of water and acetic acid in the flakes is substantially reduced.
Claims8
A process for separating water and acetic acid from the aqueous phase contained in cellulose acetate flakes precipitated from esterification solutions of cellulose, comprising simultaneously extracting water and acetic acid from the aqueous phase with supercritical carbon dioxide until the content of water in the acetate flakes is reduced to approximately 1-2% by weight.
A process for separating water and acetic acid from the aqueous phase contained in cellulose acetate flakes precipitated from esterification solutions of cellulose, comprising simultaneously extracting water and acetic acid from the aqueous phase with supercritical carbon dioxide until the content of acetic acid in the acetate flakes is reduced to approximately 10-20 ppm.
Dependencies are inferred from the claim text.