Browse Prior Art Database

Compatibility Enhancement of Chlorofluoro Coolants

IP.com Disclosure Number: IPCOM000076497D
Original Publication Date: 1972-Mar-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Anschel, M: AUTHOR

Abstract

Chlorofluoro coolants are desirable from the viewpoint of their relatively low cost as compared to perfluorinated systems. However, compatibility difficulties may be encountered with metals, particularly at high temperatures, via facile open-chain type elimination reactions, viz., (Image Omitted)

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Compatibility Enhancement of Chlorofluoro Coolants

Chlorofluoro coolants are desirable from the viewpoint of their relatively low cost as compared to perfluorinated systems. However, compatibility difficulties may be encountered with metals, particularly at high temperatures, via facile open-chain type elimination reactions, viz.,

(Image Omitted)

Isomers of 1, 2 dichlorohexafluorcyclobutane (I) are compatible with metals up to much higher temperatures (> 500 Degrees F) since the cis isomer is not converted to the transform below 350 Degrees F (177 Degrees C), viz.,

(Image Omitted)

The 1,3-cyclic dichloro isomers (II) are thermodynamically still less likely to undergo transelimination reactions with metal, viz.,

(Image Omitted)

This reaction is similar to the one which is utilized in production of the 1,2- cyclic dichloro isomers except that higher temperatures and pressures are utilized in the dimerization step, which should result in the relative orientation of the monochlorotrifluoroethylene molecules to give nonadjacent carbon-fluorine bonds.

The superiority of the 1,3 isomers (II) is postulated to be due to the fact that the cis is still more sterically strained for elimination type reactions. Moreover, the decomposition product of the trans is stable, viz.:

(Image Omitted)

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