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Butylene (butylene, C4H8) has four isomers: 1-butene (CH3CH2CH=CH2); 2-butene (CH3CH=CHCH3), wherein 2-butene is further divided into cis and trans; CH3C(CH3)=CH2). The physical and chemical properties of the isomers of butene are basically similar. Under normal conditions, they are all colorless gases, insoluble in water, and soluble in organic solvents. Flammable and explosive. N-butene has a weak aromatic odor. The molecular weight was 56.1 and the density was 0.5951 g/cm3 (20/4 ° C). Isobutylene has an unpleasant odor. The explosion limit is 1.8% to 9.6%. The boiling point is - 6.90 °C.

Butene is a general term for four isomers of the chemical formula C4H8, which are mainly colorless gases derived from crude oil. These four isomers each contain four carbon atoms and one double bond.

N-butene is mainly used in the manufacture of butadiene, and secondly in the manufacture of methyl ethyl ketone, sec-butanol, butylene oxide and butene polymers and copolymers. Isobutylene is mainly used in the manufacture of butyl rubber, polyisobutylene rubber and various plastics.

In many cases, 1-butene and 2-butene need not be separated, and can be chemically processed together to produce many important basic organic chemical products, such as hydration to sec-butanol to produce methyl ethyl ketone, oxidative dehydrogenation to butadiene. Catalytic oxidation to maleic anhydride and acetic acid. 1-butene polymerizable in polymer chemical to form poly-1-butene with high temperature creep resistance, wear resistance and stress crack resistance, and copolymerized with ethylene as linear low density polyethylene (see polyethylene) . The latter is an emerging polymer.

Butene is one of the important basic chemical raw materials. 1-butene is a raw material for synthesizing sec-butanol and dehydrogenating to butadiene; cis and trans-2-butene are used for synthesizing C4 and C5 derivatives and preparing cross-linking agent, superimposed gasoline, etc.; The raw materials of butyl rubber and polyisobutylene rubber are reacted with formaldehyde to form isoprene, and polyisobutylene polymers of different molecular weights can be prepared for use as lubricating oil additives, resins and the like.