C4 fraction Mainly from the refining process and the production of ethylene cracker joint system product.

Those containing four carbon atoms in the hydrocarbon mixtures. The main ingredients are n-butane, isobutane, isobutene, 1,3-butadiene, 1-butene, 2-butene so. Mainly from the refining process and the production of ethylene cracker joint system product. The refinery addition to C4 alkanes (C4 fraction), but also contains a lot of olefins, but with little or no butadiene and alkynes. Cracking cogeneration C4 paraffin content less, mainly butene and butadiene. Extractive Distillation of C4, also available absorption, zeolite, complexation such separation. For organic synthesis, synthetic rubber, synthetic resins and methyl tert-butyl ether and other materials, may also be for industrial, civilian fuel.

C4 fraction