Method and apparatus for producing high density dry ice

Refrigeration – Cryogenic treatment of gas or gas mixture – Solidification

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60653, F25J 100

Patent

active

057351406

ABSTRACT:
A pneumatic apparatus produces high density dry ice pellets without external electric or hydraulic energy. The apparatus operates solely on compressed air for reduced capital and maintenance costs and for portability to harsh or remote locations. An air-over-oil booster is connected to a pelletizing cylinder which is in turn connected to a source of liquid CO.sub.2 through an electronic controller. The controller sequences a set of fluid valves for operation of both the booster and pelletizing cylinder.

REFERENCES:
patent: 3835657 (1974-09-01), Scudder
patent: 4072013 (1978-02-01), Barareschi
patent: 4993226 (1991-02-01), De Kok
patent: 5419138 (1995-05-01), Anderson et al.
patent: 5475981 (1995-12-01), Becker

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