Cold trap

Refrigeration – Low pressure cold trap process and apparatus

Patent

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Details

55269, 62268, 62278, B01D 800

Patent

active

045065136

ABSTRACT:
A cold trap for removing contaminants from a vapor stream has a coolant expansion chamber extending the length of the cold trap housing and a stack of spaced-apart, perforated disk-shaped baffles mounted about the outside of the expansion chamber. A coolant feed tube is mounted inside, and extends the length of, the expansion chamber. Coolant exits the feed tube into the expansion chamber through a small tangential outlet hole in the bottom of the feed tube to increase coolant turbulence and heat transfer efficiency. The cold trap causes the vapor stream to pass through one or more centrifugal separation and condensation stages defined by the baffles to remove solid particles, mists and condensates. A reversible refrigeration system is used both to cool the cold trap and to rapidly defrost it. This permits the rapid liquification and drainage of collected contaminants. The trap is easily taken apart for manual cleaning of residue, and is thus well suited for removing gummy and reactive contaminants removed from the vapor stream.

REFERENCES:
patent: 1974145 (1934-09-01), Atwell
patent: 2015288 (1935-09-01), Rosen
patent: 2015490 (1935-09-01), McAllister
patent: 2301529 (1942-11-01), Fagan
patent: 3124443 (1964-03-01), Hellingman et al.
patent: 3188785 (1965-06-01), Butler
patent: 3366107 (1968-01-01), Frantom
patent: 3593495 (1971-07-01), Ellison
patent: 3636723 (1972-01-01), Kramer
patent: 3854300 (1974-12-01), Gerhold

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