Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Patent
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:
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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.
Clarke Vera C.
Dees Jos,e G.
Enviropur Waste Refining And Technology, Inc.
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