| 摘要 |
<p>PCT No. PCT/EP92/01669 Sec. 371 Date Mar. 19, 1993 Sec. 102(e) Date Mar. 19, 1993 PCT Filed Jul. 22, 1992 PCT Pub. No. WO93/03064 PCT Pub. Date Feb. 10, 1993A 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.</p> |
