Processes for the manufacture and purification of 1,1,2,2,3,3,4,

Details Processes for the manufacture and purification of 1,1,2,2,3,3,4, Processes for the manufacture and purification of 1,1,2,2,3,3,4,

1997-06-03

1998-10-06

Dentz, Bernard

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

Organic compounds

Halogen containing

C07C 1908

Patent

active

058178937

ABSTRACT:
A process is disclosed for producing 1,12,2,3,3,4,4-octafluorobutane. The process involves chlorination of 2,2,3,3-tetrafluorobutane to form a mixture of chloro-compounds wherein compounds of the formula C.sub.4 H.sub.4 Cl.sub.6-x F.sub.4 (where x is 0 or 1) comprise at least 50 mole % of the mixture of chloro-compounds, followed by hydrofluorination, then hydrogenolysis, and sufficient recycle to provide a selectivity to CHF.sub.2 CF.sub.2 CF.sub.2 CHF.sub.2 of at least about 75% based upon the moles of CH.sub.3 CF.sub.2 CF.sub.2 CH.sub.3 reacted. Also disclosed is a multi-distillation process for the purification of CHF.sub.2 CF.sub.2 CF.sub.2 CHF.sub.2 from a mixture of HF and the compound(s). Also disclosed are certain new halogenated butanes containing fluorine, and a composition which contains HF in combination with an effective amount of CHF.sub.2 CF.sub.2 CF.sub.2 CHF.sub.2 to form an azeotrope or azeotrope-like composition with hydrogen fluoride.

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