PROCESS FOR PREPARING HIGHLY PURE RAFFINATE II AND METHYL TERT-BUTYL ETHER

摘要

ABSTRACTPROCESS FOR PREPARING HIGHLY PURE RAFFINATE II AND METHYL TERT-BUTYL ETHERThe invention relates to a process for preparing methyl tert-butyl ether (MTBE) and a virtually isobutene-free C[err]-hydrocarbon mixture by reaction of an isobutene-containing C[err]-hydrocarbon stream with methanol over an acid catalyst, wherein, in a first stage in one or more reactor(s), isobutene is reacted with methanol to equilibrium formation of MTBE and, in a second stage in a reactive distillation column, the remaining isobutene present in the mixture is reacted over an acid catalyst, where the reactive distillation column is operated in a pressure range from 3 to 15 bar abs. and in a temperature range in the reaction zone from 55[err]C to 75[err]C at a hydraulic loading in the catalytic packing of from 10% to 110% and a refluxratio of less than 1.The use of the virtually isobutene-free C[err]-hydrocarbon mixture and the MTBE prepared according to the invention.FIGURE 1