A METHOD FOR INCREASING YIELDS OF ETHYLENE AND PROPENE IN MTO PROCESS

摘要

The present invention discloses a method for increasing yields of ethylene and propene in MTO process, which comprises: i) feeding a raw material containing at least one of methanol and dimethylether, and C4 hydrocarbon, from a bottom distributor of the reactor and optionally from at least one position upper the distributor into a reaction region comprising molecular sieve catalysts; ii) reacting the raw material in the presence of the molecular sieve catalysts to produce a product flow containing ethylene, propene and C4 hydrocarbon; iii) taking out the product flow from the top of the reactor and feeding them into a separate system to separate ethylene, propene and C4 hydrocarbon; and iv) recycling the C4 hydrocarbon separated in the step iii) back into the step i).