Polymerization inhibitor for tetrafluoroethylene

Details Polymerization inhibitor for tetrafluoroethylene Polymerization inhibitor for tetrafluoroethylene

2008-05-15

2010-10-05

Parsa, Jafar (Department: 1621)

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

Organic compounds

Halogen containing

Reexamination Certificate

active

07807859

ABSTRACT:
The present invention provides a polymerization inhibitor preventing the self-polymerization of TFE and the generation of a modified polymer of a polymerization inhibitor in a distillation step, particularly in a rectification step, of TFE. The present invention provides a method of distilling tetrafluoroethylene in the presence of a polymerization inhibitor comprising a cyclohexadiene compound of the formula:in-line-formulae description="In-line Formulae" end="lead"?R1-A-R2in-line-formulae description="In-line Formulae" end="tail"?wherein R1is a hydrocarbon group having 1 to 5 carbon atoms, R2is a hydrogen atom or a hydrocarbon group having 1 to 5 carbon atoms, and A is a cyclohexadiene ring. The cyclohexadiene compound is preferably α-terpinene or γ-terpinene.

REFERENCES:
patent: 2737533 (1956-03-01), Marks et al.
patent: 3834996 (1974-09-01), Aiso et al.
patent: 0724148 (1996-07-01), None
patent: 1317517 (1973-05-01), None

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