Processes for purifying acetic and hydrating anhydride
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United States of America Patent
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Mar 6, 2018
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N/A
app pub date -
Nov 10, 2016
filing date -
Nov 13, 2015
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Abstract
Processes for purifying acetic acid by distilling a process in a column in which acetic anhydride is formed in the lower portion of the column. The product stream withdrawn from the column comprises acetic acid, water at a concentration of no more than 0.2 wt. %, and acetic anhydride at a concentration of no more than 600 wppm. The process further comprises hydrating the acetic anhydride in the product stream to form a purified acetic acid product comprising acetic anhydride at a concentration of no more than 50 wppm.
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