Process for crystallizing and drying polyethylene terephthalate

Details Process for crystallizing and drying polyethylene terephthalate Process for crystallizing and drying polyethylene terephthalate

1976-12-16

1978-10-17

Phynes, Lucille M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Treating polymer containing material or treating a solid...

C08G 6374

Patent

active

041208498

ABSTRACT:
Polyester granules are crystallized and dried by passing hot gasses of 120.degree. to 190.degree. C in upward direction through the stationary layer of loose polyester granules resting in a cylindrical container on a plane or conical perforated tray slowly rotating about its vertical axis. The hot gas is passed through the material in an amount such that no fluidization is brought about. Under the action of the hot gas the granules agglomerate and the agglomerate is alternately slightly lifted and lowered again by stripping edges on the perforated tray whereby the agglomerate portion resting on the tray is disintegrated and the crystallized granules are discharged through slots behind the stripping edges in the tray.

REFERENCES:
patent: 3014011 (1961-12-01), Zoetbrood
patent: 3305532 (1967-02-01), Middleburg et al.
patent: 3547890 (1970-12-01), Yamada et al.
patent: 3756990 (1973-09-01), Jaeger et al.

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