Adsorbent for purifying perfluorocarbon, process for...

Details Adsorbent for purifying perfluorocarbon, process for... Adsorbent for purifying perfluorocarbon, process for...

2006-08-22

2006-08-22

Witherspoon, Sikarl A. (Department: 1621)

Organic compounds -- part of the class 532-570 series

Organic compounds

Halogen containing

C570S179000, C502S056000, C502S180000

Reexamination Certificate

active

07094935

ABSTRACT:
To provide a purification adsorbent capable of effectively removing impurities contained in a perfluorocarbon and obtaining a perfluorocarbon reduced in the impurity content to 1 ppm by mass or less; a process for producing the adsorbent; high-purity octafluoropropane or octafluorocyclobutane; processes for purifying and for producing the octafluoropropane or octafluorocyclobutane; and uses thereof. Purification is performed using a purification adsorbent produced by a method comprising (1) washing an original coal with an acid and then with water, (2) deoxidizing and/or dehydrating the original coal, (3) re-carbonizing the original coal at a temperature of from 500 to 700° C. and (4) activating the original coal at a temperature of from 700 to 900° C. in a mixed gas stream containing an inert gas, carbon dioxide and water vapor.

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DATABASE WPI. Section Ch, Week 199441. Derwent Publications Ltd., London, GB; AN 1994-329775 XPOO2204515.

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