Browse Prior Art Database

Perfluorocarbon Coolant Reclamation System

IP.com Disclosure Number: IPCOM000085467D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 3 page(s) / 49K

Publishing Venue

IBM

Related People

Shields, RR: AUTHOR

Abstract

This method and apparatus relates to a simple and efficient technique for reclamation of perfluorocarbon coolant used in liquid encapsulated modules. The purity of a perfluorocarbon coolant used in liquid encapsulated packages for semiconductor devices must be very high, in order to meet the stability and dependability requirements. In use, the perfluorocarbon can become contaminated by contaminants within and outside of the module, for instance solder flux used in joining the semiconductor to the substrate.

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Perfluorocarbon Coolant Reclamation System

This method and apparatus relates to a simple and efficient technique for reclamation of perfluorocarbon coolant used in liquid encapsulated modules. The purity of a perfluorocarbon coolant used in liquid encapsulated packages for semiconductor devices must be very high, in order to meet the stability and dependability requirements. In use, the perfluorocarbon can become contaminated by contaminants within and outside of the module, for instance solder flux used in joining the semiconductor to the substrate.

After the coolant has been in use, it may become contaminated, for whatever reason, and require that it be purified or replaced with new uncontaminated liquid. Since the liquid is relatively expensive, it is desirable to recycle the original liquid, if possible. One possible technique for reclamation of the perfluorocarbon coolant is distillation. However, this is a relatively slow process in which difficulty could be encountered in removing certain types of volatile contaminants, such as acetic acid, HCL, methanol, etc.

In this system, the coolant is purified by passing it through an ion 10 to hold the coolant to be purified. The coolant is introduced through a plug 12 prior to pressurizing the system.

After the coolant has been introduced into reservoir 10, the air pressure valve 14 is opened allowing air to flow through a desiccant, such as CaSO(4) contained in filter 16 which removes any entrapped water. An air filter 17 removes particulates from the air stream. A pressure relief valve 18 is provided in the line as well as an open and close valve 20 for bleeding off pressure.

After the reservoir has been pressurized, the flow valve 22 is opened as are valves 29 and 33 which are kept closed when the system is not in use to keep the desiccant in column 28 dry. This allows the fluid to enter the first column 24 which is filled with an analytically pure mixed-bed ion exchange resin that removes any dissolved acids, bases, or inorganic ions from the fluid.

The resin in column 24 is first presoaked in water which swells the resin. The excess water is then removed and what remains is a resin containing internally trapped and surface-bound wate...