Air Products and Chemicals, Inc.

Other

Charles M Monroe

Jeremy P Miller

Mark Sherman Williams

Miles P Drake

A method of freezing aqueous liquids which method comprises the steps of:

Method and apparatus for freezing aqueous liquid

Supplementary cooling for a mechanical refrigeration plant using ammonia as a refrigerant is provided by placing a tube in the vapor space of a buffer vessel and introducing liquid nitrogen into the tube. Although ammonia solidifies at -78.degree. C. and liquid nitrogen enters the tube at -196.degree. C. no ammonia solidifies on the tube even after extended operation. The present invention also provides a method of refrigeration which comprises introducing liquid nitrogen into the heat exchanger of a refrigeration apparatus in accordance with the invention and condensing refrigerant therewith. Preferably, the refrigerant is selected from the group consisting of ammonia and fluorocarbon R22.

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High Wycombe, United Kingdom

Charles M Monroe