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Related to Isobutene: isobutylene


(organic chemistry)



isobutylene, the unsaturated hydrocarbon (CH3)2C=CH2, a colorless gas. Boiling point, — 6.9°C; density, 0.6266 g/cm3 (at -6.6°C); Isobutene 1.3814. Isobutene is made industrially by dehydrogenating isobutane over oxide catalysts (forexample, Cr203 on A1203) at 500°-600°C or by dehydrating isobutyl alcohol. The ability of isobutene to polymerize and copolymerize is used in industry in making polyisobutene and butyl rubber. Isobutene is also used to alkylate aromatic compounds and isobutane in making isooctane.

References in periodicals archive ?
isobutene or bromomethane) Sample Gamma-Sterilized Gamma--and Steam- Sterilized A New significant signals: General observations: --isobutene --Compared to gamma-sterilized sample, --Diisobutene no new signals observed --Various saturated --Decreasing intensity of and unsaturated most signals, especially hydrocarbons low boiling substances (e.
Henry's constants and infinite dilution activity coefficients of propane, propene, butane, isobutane, 1-butene, isobutene, trans-2-butene, and 1,3-butadiene in 1-butanol and 2-butanol from (250 to 330) K.
In the acidic hydrolysis of esters, for instance, methyl esters follow the acyl route, eliminating methanol, while tert-butyl esters follow the alkyl route, eliminating isobutene.
where VC1 and VC2 are the variability costs of the distillate and isobutene, respectively.
The coating provides protection against oil, emulsion, ammonia vapour, hydrogen sulphide and diesel, and ethanol, benzene, isobutene and dilutions pH10 to pH4 at room temperature for five minutes.
The combination induces chemical reactions that release isobutene gas, forming cells smaller than 10 microns.
Hot water is used to heat a refrigerant, such as isobutene or ammonia, which creates steam at a much lower temperature than water.
The GAA and GLA products contained an N-linked t-butyloxycarbonyl group, which provided a route for efficient neutral-loss fragmentation by loss of isobutene and C[O.
There are also many other suggestions to replace the toxic MTBE, for instance by dimer of isobutene [77].
Other types of synthetic rubber imported by then country include polybutadiene styrene latex, isobutene isoprene (butyl) rubber (IIR), isoprene rubber (IR) and ethylene propylene non conjugated diene rubber (EPDM).
Three butane isomerization plants with 116,000 bpd of high purity isobutene production capacity representing 70 percent of U.