Separation of azeotropes in poly(vinyl alcohol) process
AssigneeAir Products and Chemicals, Inc.
InventorMichael S. Chen
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Abstract
In a process for preparing poly(vinyl alcohol), an improved method for separating the methanol/acetate azeotropes that result from said process. The azeotropes are separated by selective adsorption of methanol on an adsorbent followed by regeneration of the adsorbent with hot methanol vapor.
Claims14
In a process for preparing poly(vinyl alcohol) which includes stripping poly(vinyl acetate) paste with a first stream of hot methanol vapor, an improved method to separate a methanol/vinyl acetate azeotrope or a methanol/methyl acetate azeotrope or both comprising selective adsorption of methanol on an adsorbent followed by regeneration of the adsorbent with a second stream of hot methanol vapor wherein the second stream of hot methanol vapor is recycled as a portion of the first stream of hot methanol vapor.
Dependencies are inferred from the claim text.