Method of purifying hexafluoroacetone containing chlorofluoroace

Details Method of purifying hexafluoroacetone containing chlorofluoroace Method of purifying hexafluoroacetone containing chlorofluoroace

Filed on

1981-11-10

Date issued

1983-05-31

Examiner

Reamer, James H.

Patent Class

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

SubClass

Organic compounds

SubSubClass

Oxygen containing

Other Related Categories

C07C 4585

Type

Patent

Status

active

Patent number

043862233

Description

ABSTRACT:
Crude hexafluoroacetone (HFA) containing chlorofluoroacetone(s) (CFA) as well as hydrogen halide(s) is purified by initially allowing the crude HFA to be absorbed in water to give an aqueous solution in which HFA and CFA are in the form of their respective hydrates, adding a calcium compound such as carbonate, hydroxide or oxide to the solution to neutralize the hydrogen halide(s), and decomposing the hydrated CFA by first adding an alkali metal compound such as K.sub.2 CO.sub.3 or Na.sub.2 CO.sub.3 or an alkaline earth metal compound such as Ca(OH).sub.2, Ba(OH).sub.2, CaO or BaO to the solution and subsequently adding a mineral acid such as HCl or H.sub.2 SO.sub.4 to the same solution. This procedure results in complete decomposition of CFA without causing decomposition of HFA and spontaneous separation of the liquid reaction system into two layers, one of which is exclusively HFA hydrate. Accordingly it is easy to separate pure HFA hydrate from the decomposed impurities.

REFERENCES:
patent: 3320322 (1967-05-01), Langdon et al.
patent: 3433838 (1969-03-01), Cunningham
patent: 3632652 (1968-03-01), Chu et al.
patent: 3745093 (1973-07-01), Lee
patent: 4059633 (1977-11-01), Childs
Krespan, J. Org. Chem., vol. 43, No. 4, pp. 637-640 (1978).

Affiliated with

Also associated with

Rating

Method of purifying hexafluoroacetone containing chlorofluoroace does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Method of purifying hexafluoroacetone containing chlorofluoroace, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of purifying hexafluoroacetone containing chlorofluoroace will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2246593