| 摘要 |
A description is given of a process for the preparation of tertiary alkyl ethers, in particular of tert-amyl methyl ether (TAME), which comprises: - a reaction zone in which the charge, consisting of a mixture of C5 hydrocarbons, including reactive isopentenes, is reacted with an aliphatic monoalcohol in excess, such as methanol, ethanol, propanol or isopropanol; - a fractionation zone in which there is collected, at the bottom, the corresponding pure tertiary alkyl ether, the head effluent after condensation being divided into a liquid reflux and a distillate, the said process being characterised in that a finishing reactor is installed on the reflux, or on the reflux effluent + distillate before their division, or alternatively two finishing reactors are installed, one on the reflux, the other on the distillate, with the possibility of injection of aliphatic monoalcohol upstream of each finishing reactor. The advantage of the process is that it makes it possible to increase the conversion of the isopentenes and the pure tertiary alkyl ether yield at the bottom of the fractionation zone. This process is also applicable to mixtures of C4, C6 and C7 hydrocarbons, which can react in excess with the abovementioned aliphatic monoalcohols to form the corresponding tertiary alkyl ethers. |
