1- Butylene

Butylenes are C Hg mono-olefin isomers 1-butene, 7j -2-butene, trans-2-huX.en.e and isobutylene (2-methylpropene). These isomers are usually coproduced as a mixture and are commonly referred to as the fraction. These fractions are usually obtained as by-products from petroleum refinery and petrochemical complexes that crack petroleum fractions and natural gas Hquids. Since the fractions almost always contain butanes, it is also known as the B—B stream. The linear isomers are referred to as butenes. [Pg.361]

For any industrial process involving vapors and Hquids, the most important physical property is the vapor pressure. Table 1 presents values for the constants for a vapor-pressure equation and the temperature range over which the equation is vaHd for each butylene. [Pg.361]

Kirk-Othmer Encyclopedia of Chemical Technology (4th Edition) [Pg.361]

The carbon—carbon double bond is the distinguishing feature of the butylenes and as such, controls their chemistry. This bond is formed by sp orbitals (a sigma bond and a weaker pi bond). The two carbon atoms plus the four atoms ia the alpha positions therefore He ia a plane. The pi bond which ties over the plane of the atoms acts as a source of electrons ia addition reactions at the double bond. The carbon—carbon bond, acting as a substitute, affects the reactivity of the carbon atoms at the alpha positions through the formation of the aHyUc resonance stmcture. This stmcture can stabilize both positive and [Pg.362]

Buiene, -butylene, CH3CH CHCH3-Prepared by heating 2-buianol with sulphuric acid. It occurs as two geometrical isomers. [Pg.72]

For general reactions see olefins. The butylenes are used to prepare 2-butanol. I-Butene and isobutene are formed into widely used polymers. [Pg.72]

Dihydroxybutane. -butylene glycol, CH3CH(0H)CH2CH20H, b.p. 204°C. Manufactured by reduction of aldol or by the action of yeast on aldol. Used to prepare butadiene. Used in brake fluids, in gelling agents and as an intermediate in plasticizers. [Pg.72]

HOCH2CH2CH2CH2OH. B.p. 228"C. Prepared ethyne plus methanal, hydrogenated to butanediol. Used in production of y-buty-rolactone and 2-pyrrolidone. Widely used in polyurethane products, butylenes See butenes. [Pg.72]

It is not advisable to distil the mixture almost to dryness, since, towards the end of the distillation, the inflammable butylene is formed. Butylene formation is avoided by conducting the distillation in two stages as described. [Pg.282]

The derivatives of ethylene dibromide, propylene dibromide, trimethylene dibromide and tao-butylene dibromide melt at 260°, 232°, 229° and 223° respectively. [Pg.292]

Chlorinated polyether Poly(butylene terephthalate) (PBT) talso called... [Pg.1010]

Poly butylene (PB) Styrene-butadiene block copolymer... [Pg.1011]

Poly(butylene Terephthalate). Poly(butylene terephthalate) is prepared in a condensation reaction between dimethyl terephthalate and 1,4-butanediol and its repeating unit has the general structure... [Pg.1019]

Low viscosity 30% glass-fiber reinforced Poly(butylene terephthalate) Poly(ethylene terephthalate) ... [Pg.1044]

Polyolefin Polyester Block copolymers of styrene and butadiene or styrene and isoprene Block copolymers of styrene and ethylene or styrene and butylene Poly(vinyl chloride) and poly(vinyl acetate) ... [Pg.1058]

Properties Polyolefin Polyester isoprene butylene filled Rigid unfilled... [Pg.1059]

Amm oxida tion, a vapor-phase reaction of hydrocarbon with ammonia and oxygen (air) (eq. 2), can be used to produce hydrogen cyanide (HCN), acrylonitrile, acetonitrile (as a by-product of acrylonitrile manufacture), methacrylonitrile, hen onitrile, and toluinitnles from methane, propylene, butylene, toluene, and xylenes, respectively (4). [Pg.217]

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