Cleaning and liquid contact with solids – Processes – Including regeneration – purification – recovery or separation...
Patent
1998-08-12
1999-04-20
El-Arini, Zeinab
Cleaning and liquid contact with solids
Processes
Including regeneration, purification, recovery or separation...
134 31, 134 40, 134 56R, 134 58R, 134105, 134108, B08B 310
Patent
active
058948511
ABSTRACT:
A method of vapor degreasing workpieces using a refrigerated vapor degreasing system. The system has a tank for containing a bath of degreasing solvent, a heater for vaporizing the solvent, a primary solvent condenser, a secondary solvent condenser, and a single refrigeration unit which can be switched to operate in two different modes. Workpieces are loaded and supported within the tank. The degreasing solvent is heated and evaporated in the tank. Refrigerant is cycled in a closed-loop, single compressor refrigeration system as low-pressure/low-temperature vapor, high-pressure/high-temperature vapor, high-pressure/low-temperature liquid, low-pressure/low-temperature vapor, and low-pressure/low-temperature liquid. A degreasing zone is formed around the workpiece and a primary evaporation barrier is formed above the workpiece by circulating low-pressure/low-temperature refrigerant from the refrigeration system through the primary solvent condenser located above the workpiece. The evaporated degreasing solvent condenses on the workpiece in the degreasing zone to clean the workpiece. A secondary evaporation barrier is formed above the degreasing zone by circulating low-pressure/low-temperature refrigerant from the refrigeration system through the secondary solvent condenser located above the degreasing zone. The secondary solvent condenser is intermittently defrosted by circulating high-pressure/high-temperature refrigerant from the refrigeration system through the secondary solvent condenser.
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A. Earley John F.
A. Earley III John F.
El-Arini Zeinab
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