Process and apparatus for continuous crystallization of plastic

Details Process and apparatus for continuous crystallization of plastic Process and apparatus for continuous crystallization of plastic

1995-06-27

1996-09-24

Straub, Gary P.

Chemistry: physical processes

Physical processes

Crystallization

23313FB, 528502R, 528503, 585899, 4222451, B01D 900, B29B 1302

Patent

active

055586783

ABSTRACT:
A process and an apparatus for the continuous crystallization of plastic granules, particularly amorphous plastic granules, in which the granules are introduced into a container and form a granule bed, which is moved downwards by the action of gravity. A hot gas is passed as a primary gas in a countercurrent manner through the granule bed. The granules are kept moving by a stirrer. There is also a gas supply for a secondary gas, which introduces the secondary gas at high speed at several points distributed over the cross-section of the container into the upper area of the granule bed.

REFERENCES:
patent: 4120849 (1978-10-01), Breitschaft et al.
patent: 4226973 (1980-10-01), Malo et al.
patent: 4231991 (1980-11-01), M uller
patent: 4584366 (1986-04-01), Gerking et al.
patent: 4963644 (1990-10-01), Duh
patent: 5290913 (1994-03-01), McAllister et al.
European Search Report, EP 92 25 0334.
Patent Abstracts of Japan, vol. 13, No. 237 (M-833) (3585), Jun. 5, 1989.
Inernationl Publications WO 89/11073.

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