METHOD FOR PRODUCING PROPYLENE FROM METHANOL

摘要

According to the method, methanol vapour is reacted on a first catalyst to obtain a first vapour mixture containing dimethylether (DME) and a product mixture containing propylene is then produced from the first vapour mixture on a shape-selective zeolite catalyst. The shape-selective zeolite catalyst is provided as a feed material in at least two shaft reactors that are connecte d in series. A first sub-stream of the first vapour mixture containing DME is fed together with water vapour into the first shaft reactor. A first intermediate product mixture is drawn off from the first shaft reactor and f ed to the second shaft reactor, whereby a second sub-stream of the first vapour mixture containing DME is also supplied to the second shaft reactor. A produ ct mixture is drawn off from the last shaft reactor connected in series and a propylene fraction is separated, whereby residual substances that are in par t gaseous are also obtained. At least one part of the residual substances is r e- supplied to at least one of the shaft reactors.