Process for thermal decomposition of hexafluoropropylene oxide oligomers
AssigneeDaikin Industries, Ltd.
InventorsShigeru Morita, Toshihiko Amano
Life of this patent
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Abstract
A hexafluoropropylene oxide oligomer of the formula: RfO[CF(CF3)CF2O]nCF(CF3)COF in which Rf is a group represented by the formula: F(CF2)m— in which m is an integer of 1 to 8, or the formula: (CF3)2CF(CF2)q— in which q is an integer of 0 to 6, and n is a number of 3 to 20 is heated and thermally decomposed in a solvent at a temperature of at least 100° C. in the presence of a compound which generates a fluoride (F−) ion to obtain mainly the dimer, trimer and tetramer of hexafluoropropylene oxide. Thus, the valuable low molecular weight oligomers of hexafluoropropylene oxide can be obtained from high molecular weight oligomers of hexafluoropropylene oxide which have been discarded.
Claims8
A process for the thermal decomposition of a hexafluoropropylene oxide oligomer of the formula:
- RfO[CF(CF3)CF2O]nCF(CF3)COF (I)
- wherein Rf is a group represented by the formula:
- F(CF2)m—
- in which m is an integer of 1 to 8, or the formula:
- (CF3)2CF(CF2)q—
- in which q is an integer of 0 to 6, and n is a number of 3 to 20 comprising the step of heating the oligomer in a solvent at a temperature of at least 100° C. in the presence of a compound which generates a fluoride (F−) ion.
A process for harvesting
- RfO(CF(CF3)CF2O)n CF(CF3)COF,
- wherein Rf is a group represented by the formula:
- F(CF2)m—
- in which m is an integer of 1 to 8, or the formula:
- (CF3)2CF(CF2)q—
- in which q is an integer of 0 to 6,
- n is an integer of 0 to 2,
- and
- CF3CF2COF
- from the thermal decomposition of a hexafluoropropylene oxide oligomer of the formula:
- RfO(CF(CF3)CF2O)nCF(CF3)COF (I)
- wherein Rf is a group represented by the formula:
- F(CF2)m—
- in which m is an integer of 1 to 8, or the formula:
- (CF3)2CF(CF2)q—
- in which q is an integer of 0 to 6, and
- n is a number of 3 to 20,
- comprising the steps of:
- (a) heating the oligomer in a solvent at a temperature of at least 100° C. in the presence of a compound which generates a fluoride (F−) ion
- (b) distilling and condensing a product obtained from step (a), and
- (c) recovering said product obtained from step (b).
Dependencies are inferred from the claim text.