Membrane reactor

The utility model belongs to the technical field of chemical equipment and processes, and particularly relates to a membrane reactor. The membrane reactor provided by the utility model is used for the reaction of preparing olefin by hydrogenation of carbon dioxide, and the membrane reactor can be used for carrying out segmented temperature control to respectively meet the optimal temperatures required by the two-step reaction of preparing methanol by hydrogenation of CO2 and the reaction of preparing olefin by methanol, so that the catalytic performance of a catalyst is optimal. And the reactor does not need to be additionally provided with a cold trap, so that the investment cost and energy consumption are effectively reduced. Particularly, through the arrangement that the molecular sieve water permeable membrane and the gas channel are used for purging the purging gas, the by-product H2O generated in the reaction of preparing methanol from CO2 and the reaction of preparing olefin from methanol is removed re