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US 2007/0167618 A1Published application
Manufacture of cellulose esters: recycle of caustic and/or acid from pre-treatment of pulp
AssigneeCelanese Acetate LLC
InventorsLinfu Wang, Henry Stogner, Denis Fallon, Lawton Kizer, Charles Toney, Billy Batson
Life of this patent
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Abstract
A process for the manufacture of cellulose esters is described. The process includes the steps of: pre-treating pulp for the removal of impurities with either caustic or acid or both, esterifying the pre-treated pulp, and recycling the caustic or acid or both from the pre-treating step.
Claims30
In a process for the manufacture of cellulose esters wherein the process comprising the steps of pre-treating pulp for the removal of impurities with either caustic or acid or both and esterifying the pretreated pulp, the improvement comprising the steps of:
- recycling the caustic or acid or both from a stream from the pre-treating step.
Dependencies are inferred from the claim text.