Distillation: processes – separatory – Addition of material to distilland to inhibit or prevent...
Patent
1995-04-03
1996-11-26
Warden, Robert J.
Distillation: processes, separatory
Addition of material to distilland to inhibit or prevent...
203 7, 203 90, 203 94, 203 98, 203DIG23, 560 78, 568868, 568871, C07C 6754, C07C 2728, C07C 2980
Patent
active
055781730
ABSTRACT:
A method of removing dimethyl terephthalate (DMT) from a vapor stream. The vapor stream includes dimethyl terephthalate (DMT), methylhydroxyethyl terephthalate (MHET), glycols and methanol. A distillation column is held under an elevated pressure of 100 to 500 kPag and at a temperature of at least 85.degree. C. It has (i) a plurality of distillation trays; (ii) methanol liquid sprays between the trays; (iii) a main spray zone below the trays and (iv) a liquid pool of methanol in the bottom of the column. The vapor stream is directed into the distillation column, above the liquid pool and below the main spray zone, thereby forming a stream of liquid and vapor. The stream of liquid is directed away from the distillation column walls and into the liquid pool at the bottom of the column. Concurrently, a portion of the liquid in the bottom of the column is (i) recycled back into the distillation column as a spray in the column above the vapor stream inlet, thereby preventing build up of solid DMT on column surfaces and (ii) removed from the column to enable DMT removal.
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DeBruin Bruce R.
Gamble William J.
Naujokas Andrius A.
Simpson Brian L.
Toot, Jr. Walter E.
Carpenter Robert
Eastman Kodak Company
Everett John R.
Warden Robert J.
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