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Vacuum Drying and Solvent Reclamation

IP.com Disclosure Number: IPCOM000043003D
Original Publication Date: 1984-Jun-01
Included in the Prior Art Database: 2005-Feb-04
Document File: 2 page(s) / 84K

Publishing Venue

IBM

Related People

Gibbons, PA: AUTHOR

Abstract

Vacuum drying is a process in which liquids (e.g., chemical solvents) are dried from parts at accelerated rates. Disclosed herein is a vacuum drying system which uses vacuum and resistance heating, in order to accelerate the drying process and to reduce the quantity of solvent exhausted to the environment. Fig. 1 illustrates the vacuum drying and solvent reclamation system. Valves V1-V6 are on-off solenoid valves, and V7-V8 are flow regulating valves. V9 is a shut-off valve, and V10 is a vacuum check valve. F1 is a flow meter. The liquid seal vacuum pump provides vacuum for drying chambers 1 and 2. The solvent pump provides sealing fluid for the liquid seal vacuum pump.

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Vacuum Drying and Solvent Reclamation

Vacuum drying is a process in which liquids (e.g., chemical solvents) are dried from parts at accelerated rates. Disclosed herein is a vacuum drying system which uses vacuum and resistance heating, in order to accelerate the drying process and to reduce the quantity of solvent exhausted to the environment. Fig. 1 illustrates the vacuum drying and solvent reclamation system. Valves V1-V6 are on-off solenoid valves, and V7-V8 are flow regulating valves. V9 is a shut-off valve, and V10 is a vacuum check valve. F1 is a flow meter. The liquid seal vacuum pump provides vacuum for drying chambers 1 and 2. The solvent pump provides sealing fluid for the liquid seal vacuum pump. The sealing fluid used in the vacuum pump is usually the same fluid as that being dried from the part, so that no interaction occurs between dissimilar fluids. The heat exchanger is a partially flooded shell and tube heat exchanger which chills the exhaust gas from the vacuum pump, thereby condensing some of the solvent vapors from the exhaust for reclamation. Mounted in each dry chamber (one of which is illustrated in Fig. 2) are two resistance heaters which increase the solvent vapor pressure and evaporation rate. Operation of the system is as follows: Initially, the heaters, vacuum pump and solvent pump are on, with valves V1-V4 and V6 closed and V5 open. Wetted parts are placed in drying chamber 1. Valve V5 is closed and valves V3 and V6 are opened to dry...