Liquid phase synthesis of hexafluoroisobutylene

Details Liquid phase synthesis of hexafluoroisobutylene Liquid phase synthesis of hexafluoroisobutylene

1981-06-18

1983-01-04

Warren, Charles F.

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

Organic compounds

Halogen containing

549 89, C07C 1700

Patent

active

043673490

ABSTRACT:
The process for preparing hexafluoroisobutylene is disclosed which comprises reacting, in the liquid phase, formaldehyde or a formaldehyde-generating compound with hexafluorothioacetone dimer in an aprotic solvent containing at least a catalytic amount of an alkali metal fluoride or a sulfonic acid having general formula RSO.sub.3 H is disclosed. The preferred aprotic solvents are dimethylformamide, N-methyl pyrrolidone and dimethyl sulfoxide. The preferred alkali metal fluoride is KF; the preferred sulfonic acids are CH.sub.3 SO.sub.3 H and p-CH.sub.3 C.sub.6 H.sub.4 SO.sub.3 H. The production of hexafluoroisobutylene by contacting hexafluoropropene with elemental sulfur and a catalytic amount of an alkali metal fluoride such as KF in an aprotic solvent such as dimethyl sulfoxide or N-methyl pyrrolidone at a temperature of between about 40.degree. and about 70.degree. C. for a time sufficient to produce hexafluorothioacetone dimer combined with contacting said dimer in said aprotic solvent containing said alkali metal fluoride at a temperature between about 100.degree. C. and 150.degree. C. for a time sufficient to produce an effluent stream containing hexafluoroisobutylene which is recovered therefrom is also disclosed.

REFERENCES:
patent: 3894097 (1975-07-01), Vanderkooi et al.
patent: 4244891 (1981-01-01), Van Der Puy et al.

Affiliated with

Also associated with

Rating

Liquid phase synthesis of hexafluoroisobutylene does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Liquid phase synthesis of hexafluoroisobutylene, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Liquid phase synthesis of hexafluoroisobutylene will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1582869