C - Chemistry – Metallurgy – 07 – C
Patent
C - Chemistry, Metallurgy
07
C
260/511.2, 260/6
C07C 31/20 (2006.01) C07C 29/09 (2006.01) C07C 51/09 (2006.01) C07C 63/26 (2006.01)
Patent
CA 1188708
Page 1 CONTINUOUS PROCEDURE FOR OBTAINING PURE TEREPHTHALIC ACID AND GLYCOL STARTING FROM POLYETHYLENE TEREPHTHALATE WASTE Abstract of the invention A procedure is described to obtain pure terephthalic acid and glycol, which consists in carrying out, in a continuous manner and in the presence of decolorizing carbon, an aqueous and neutral hydrolysis of polyethylene terephthalate waste, under high temper- ature and pressure conditions, continuously filtering the product at the hydrolysis temperature and crystallizing the terephthalic acid, while the mother liquors are subjected to distillation in order to obtain the glycol. Basis of the invention Field of the invention The invention under consideration is related to a continuous method which permits-obtaining pure terephthalic acid and glycol and more specifically, it is related with a procedure which utilizes as a raw material polyethylene terephthalate waste and in which it is not necessary to first separate the crude or impure terephthalic acid in order to purify it in a subsequent stage by means of one
404984
Celanese Mexicana S.a.
Smart & Biggar
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