Cleaning and liquid contact with solids – Processes – Miscellaneous
Patent
1990-08-28
1991-07-02
Morris, Theodore
Cleaning and liquid contact with solids
Processes
Miscellaneous
502 22, 502 34, B08B 304
Patent
active
050282735
ABSTRACT:
The present invention provides a method for cleaning articles by removing surface particulate matter from the articles. In accordance with the present invention, the articles are immersed in a bath of liquid cryogen, chemically non-reactive with the articles to be cleaned. Prior to immersion it is necessary to insure that the articles have a sufficiently high temperature above that of the liquid cryogen and during immersion it is also necessary to insure that the articles are immersed at a sufficient rate to insure that the liquid cryogen undergoes film boiling before undergoing nucleate boiling at the surfaces of the articles. The articles are left immersed so that nucleate boiling of the liquid cryogen occurs at the surfaces of the articles. During the nucleate boiling, the surface particulate matter is carried from the articles and into the liquid cryogen bath. After the articles have reached thermal equilibrium with the liquid cryogen, the articles are removed from the bath. The method can be carried out in an atmospheric environment and at room temperature. In accordance with another aspect of the present invention, the articles can be rewarmed to room temperature in a moisture free environment to prevent atmospheric moisture from condensing on the articles.
REFERENCES:
patent: 4124528 (1978-11-01), Modell
patent: 4491484 (1985-01-01), Williams
patent: 4584140 (1986-04-01), Blewett et al.
Tamhankar Satish S.
Weltmer, Jr. William R.
El-Arini Zeinab
Morris Theodore
Pearlman Robert I.
Rosenblum David M.
The BOC Group Inc.
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