Isobutylene (or 2-methylpropene) is a hydrocarbon of significant
a four-carbon branched alkene (olefin), one of the four isomers of
standard temperature and pressure it is a colorless flammable gas.
Isobutylene can be isolated from refinery streams by reaction with
sulfuric acid, but the most common industrial method for its production
is by catalytic dehydrogenation of isobutane.
Alkylating isobutylene mixed with normal olefins will result in the
production of more heavy alkylate due to isobutylene - n-olefin
are two principle sources of highly purity isobutylene. One is the
decomposition of MTBE to isobutylene and methanol, and the other is the
dehydrogeneration of isobutane.
Distillation is the another possibility for the production of
isobutylene. For this FCC butenes should be partially hydrogeneted to
both eliminate most of the butadiene and also isomerize most 1-butene to
Isobutylene is the most explored monomer which is polymerized by
controlled/living cationic polymerization.
Isobutylene is used as an intermediate in the production of a variety of
products. It is reacted with methanol and ethanol manufacture of
gasoline oxygenates methyl tert-butyl ether (MTBE) and ethyl tert-butyl
ether (ETBE), respectively.
Isobutylene is also used in the production of methacrolein.
Polymerization of isobutylene produces butyl rubber (polyisobutylene).
Antioxidants such as butylated hydroxytoluene (BHT) and butylated
hydroxyanisole (BHA) are produced by Friedel-Crafts alkylation of
phenols using isobutylene.
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