Method for producing butene oligomers and tert-butyl ethers from C4 flows containing isobutene

A process for coproducing butene oligomers and tert-butyl ethers from isobutenic C4 streams by

• a) partly oligomerizing the isobutenic C4 streams over an acidic catalyst to give butene oligomers, and subsequently
• b) etherifying the remaining isobutene with an alcohol under acidic catalysis to give tert-butyl ethers,
• wherein
• the etherification is carried out under acid catalysis in stage b) in at least two reaction stages, of which at least the last reaction stage is carried out as a reactive distillation, and the butene oligomers obtained in stage a) are removed before the acid-catalyzed etherification in stage b).