Butene is an organic compound with the CAS number 106-98-9. It is known as "butene" under IUPAC nomenclature and has the molecular formula C4H8. Butene is an unsaturated derivative of butane and exists in two isomeric forms: 1-butene and 2-butene. Under normal temperature and pressure conditions, butene is a colorless, volatile gas with a faint "petroleum-like" odor. At the consumer level, butene is used in the following products: 1. Polymers and plastics: as a monomer for producing plastics such as polyethylene and polypropylene; 2. Synthetic rubber: for manufacturing synthetic rubbers such as styrene-butadiene rubber and nitrile rubber. Chemicals: Used as a raw material for the production of other chemicals, such as alcohols, ketones, and aldehydes. In industrial settings, butene is utilized to manufacture products in the following industries: 1. Petrochemicals: Butene is a key raw material for producing a variety of petrochemical products, including solvents, plasticizers, and elastomers; 2. Fine chemicals: Used in the production of fragrances, pharmaceuticals, and other fine chemicals; 3. Agrochemicals: Butene may be used as an intermediate in the production of pesticides.