Process for crystallizing and drying polyethylene terephthalate

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

1978-08-02

1980-04-15

Schwartz, Larry I.

Drying and gas or vapor contact with solids

Apparatus

Gravity flow type

34168, 366102, 366316, F26B 1722

Patent

active

041976606

ABSTRACT:
Polyester granules are crystallized and dried by passing hot gases 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: 1634480 (1927-07-01), Wickenden et al.
patent: 2734728 (1956-02-01), Myers
patent: 2853280 (1958-09-01), Cusi
patent: 2984462 (1961-05-01), O'Connor

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