Process for recovering dimethyl terephthalate and ethylene glyco

Details Process for recovering dimethyl terephthalate and ethylene glyco Process for recovering dimethyl terephthalate and ethylene glyco

1993-01-29

1994-04-19

Dees, Jose G.

Organic compounds -- part of the class 532-570 series

Organic compounds

Carboxylic acid esters

568868, 568871, C07C 6762, C07C 2726

Patent

active

053046730

ABSTRACT:
A process for recovering dimethyl terephthalate and ethylene glycol from a stream including aqueous ethylene glycol is described. Adding a dispersing agent to the stream renders it filterable, and a subsequent cooling of the stream containing the dispersing agent causes dimethyl terephthalate to precipitate in a form which can be removed by conventional filtration. The precipitated dimethyl terephthalate is of a quality and purity suitable for use in the manufacture of polyethylene terephthalate. A commercially valuable ethylene glycol stream is also recovered by the process.

REFERENCES:
patent: 4066835 (1978-01-01), Hahn et al.
patent: 4076946 (1978-02-01), Millick
patent: 4241216 (1980-12-01), Bergman et al.
patent: 4929749 (1990-05-01), Gupta et al.
patent: 5051528 (1991-09-01), Naujokas et al.

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