B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
202/124, 32/32,
B01D 5/00 (2006.01) B01D 8/00 (2006.01) F26B 21/06 (2006.01) F26B 21/14 (2006.01) F26B 25/00 (2006.01)
Patent
CA 1141694
METHODS AND APPARATUS FOR RECOVERING SOLVENTS ABSTRACT Methods and apparatus for recovering hydrocarbon sol- vents evaporated during the curing of solvent borne coatings in an oven include supplying an inert gas to the vicinity of the oven entrance and exit to substantially exclude oxygen there- from while safely maintaining a solvent vapor partial pressure within the oven of at least 75% of the lower explosive limit of such vapor in air. The oven atmosphere is exhausted and passed to a condenser to enable recovery of at least 85% of the solvent vapor as a liquid. Preferably, condensation of the solvent vapor is effected by heat exchange with liquid nitrogen which is effective to vaporize the liquid nitrogen to produce nitro- gen gas which may then be utilized to exclude oxygen from and to inert the oven.
309169
Airco Inc.
Gowling Lafleur Henderson Llp
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