| 摘要 |
PCT No. PCT/GB94/01411 Sec. 371 Date Dec. 18, 1995 Sec. 102(e) Date Dec. 18, 1995 PCT Filed Jun. 29, 1994 PCT Pub. No. WO95/01954 PCT Pub. Date Jan. 19, 1995Dicarboxylic acids or esters thereof are recovered from solid phase polyester materials, such as post-consumer products and factory scrap, by initially subjecting the polyester to a glycolysis reaction (in one or more stages) to produce a liquid phase medium containing depolymerisation products. The liquid phase medium is then contacted with aqueous medium or alcohol in one or ore stages to produce the dicarboxylic acid or an ester thereof together with glycol. |
