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Pentafluoropropane

5.84 kg/m3 (vapor at 1 bar, 15 °C)

1,1,1,3,3-Pentafluoropropane (HFC-245fa) is a hydrofluorocarbon is a colorless gas used primarily for closed-cell spray foam insulation. HFC-245fa is also known as pentafluoropropane and by its chemical name 1,1,1,3,3-pentafluoropropane.

Environmental Effects

Unlike CFC and HCFC blowing agents formerly used for this purpose, it has no ozone depletion potential and is nearly non-toxic. Although it is intended to remain trapped within the foam insulation, it is practically non-biodegradable with a lifetime of 7.2 years when it eventually does escape into the atmosphere. It does have a high global warming potential of 950 (950 times the global warming effect of ). Honeywell refers to this as "acceptable" in their literature, but they don't include the actual number.

Economics

One of the disadvantages of R-245fa is its cost. In 2000, R-141b cost one US dollar per pound, whereas R-245fa cost $2.50 to $4.00 per pound. As of 2007, and prior to Sinochem's production it was already a high volume production chemical, with over 1 million pounds produced annually.

R-245a can be used as a feedstock for producing HFO-1234ze.

Manufacturing history

Pentafluoropropane is produced by Honeywell and in Asia by Sinochem. Honeywell markets HFC-245fa under the Enovate and Genetron 245fa brand names. AlliedSignal, who adopted the Honeywell name after acquiring it, decided in 1999 to provide a non ozone depleting blowing agent as an alternative for dichlorofluoroethane (HCFC-141b) and trichlorofluoromethane (CFC-11). Competitors Atofina and General Electric pursued strategies using other agents.

Gallery

File:HFC-245fa mm.png|HFC-245fa measured by the Advanced Global Atmospheric Gases Experiment (AGAGE) in the lower atmosphere (troposphere) at stations around the world. Abundances are given as pollution free monthly mean mole fractions in parts-per-trillion.

References

"Isobaric Properties for 1,1,1,3,3-Pentafluoropropane (R245fa)". National Institute of Standards and Technology.
"Genetron® 245fa (R-245fa) | European Refrigerants".
(September 2000). "Genetron 245fa Material Safety Data Sheet". Honeywell.
(December 2007). "HFC-245fa- Product Stewardship Summary". Honeywell.
"Other Gases: Hydrofluorocarbons, Perfluorocarbons, and Sulfur Hexafluoride". [[Energy Information Administration.
(June 2004). "JACC 044 : 1,1,1,3,3-pentafluoropropane (HFC-245fa) (CAS No. 460-73-1)". European Centre for Ecotoxicology.
McCoy, Michael. (October 30, 2000). "Regulatory Issues Heat Up For Blowing Agents". Chemical & Engineering News Archive.
(October 10, 2011). "Sinochem and Honeywell Announce Formation of Joint Venture in China". Sinochem Group.

Wikipedia Source

This article was imported from Wikipedia and is available under the Creative Commons Attribution-ShareAlike 4.0 License. Content has been adapted to SurfDoc format. Original contributors can be found on the article history page.

insulators refrigerants fluoroalkanes hydrofluorocarbons

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