Process for recovering modified polyvinyl alcohols from aqueous solution containing them

摘要

Recovery of partially hydrolyzed copolymers of vinyl acetate and unsaturated carboxylic or sulfonic acid from aqueous solution dissolving them by adding an acid to the solution at a temperature of at least 40 DEG C. and then separating the deposited copolymers. This process can be advantageously applied to waste water dissolving the above hydrolyzed copolymers from desizing and washing of textile. About 70 to about 90% of the hydrolyzed copolymers dissolved in the solution can be recovered, and the recovered copolymers can be reused as a sizing agent for fibers.