On Wed, 29 Aug 2018 14:57:16 -0600 Craig via Mercedes <mercedes@okiebenz.com> wrote:
> https://en.wikipedia.org/wiki/Isobutane > > Isobutane is obtained by isomerization of butane. > > Alkanes > > Skeletal isomerization is not normally encountered in the laboratory, > but is the basis of large applications in refineries. In general > straight-chain alkanes, are converted to branched isomers by heating > in the presence of a platinum or acid catalyst. Examples include > isomerisation of n-butane to isobutane and pentane to isopentane. > Fuels with high branching are favored internal combustion engines.[3] Further down the page: Miscellaneous uses Isobutane is also used as a propellant for aerosol cans and foam products. Isobutane is used as part of blended fuels, especially common in fuel canisters used for camping.[8] Refrigerant Isobutane is used as a refrigerant.[9] The use in refrigerators started in 1993 when Greenpeace presented the Greenfreeze project with the German company Foron.[10] In this regard, blends of pure, dry "isobutane" (R-600a) (that is, isobutane mixtures) have negligible ozone depletion potential and very low global warming potential (having a value of 3.3 times the GWP of carbon dioxide) and can serve as a functional replacement for R-12, R-22, R-134a, and other chlorofluorocarbon or hydrofluorocarbon refrigerants in conventional stationary refrigeration and air conditioning systems. As a refrigerant, isobutane poses an explosion risk in addition to the hazards associated with non-flammable CFC refrigerants. Substitution of this refrigerant for motor vehicle air conditioning systems not originally designed for isobutane is widely prohibited or discouraged.[11] [12][13][14][15][16][17] Vendors and advocates of hydrocarbon refrigerants argue against such bans on the grounds that there have been very few such incidents relative to the number of vehicle air conditioning systems filled with hydrocarbons. [18][19] [The references are on the page linked above and are informative.] Craig _______________________________________ http://www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com