Patent ID: 7932428

Claim:
A process for preparing 1-butene from a technical mixture of C 4 hydrocarbons I, wherein the technical mixture of C 4 hydrocarbons comprise at least 1-butene, isobutene, n-butane and cis and trans 2-butenes, comprising a) reacting a portion of the isobutene present in the technical mixture to give at least one product II which boils at higher than 30° C. at standard pressure, and unconverted C 4 hydrocarbons III, b) removing the unconverted C 4 hydrocarbons III from a) by a thermal separation process, c) distillatively separating the C 4 hydrocarbons III into a fraction IV comprising the 1-butene and the isobutene, and a virtually isobutene-free fraction V comprising the cis and trans 2-butenes and the n-butane, d) reacting the isobutene present in fraction IV with at least one alcohol VI in the presence of at least one acidic catalyst to give at least one tert-butyl ether VII, and unconverted C 4 hydrocarbons VIII, e) removing the unconverted C 4 hydrocarbons VIII from d) and f) distillatively removing the 1-butene from the C 4 hydrocarbons VIII obtained in e).