METHOD AND DEVICE THEREOF FOR IMPROVING SELECTIVITY OF OXYGENATE CONVERSION TO LOW-CARBON OLEFIN

摘要

Provided is a method for improving the selectivity of oxygenate conversion to low-carbon olefin; a regenerated catalyst from a regenerator enters a pre-hydrocarbon pooling facility, where it comes into contact with an activation medium and a pre-hydrocarbon pooling reaction occurs, forming a "hydrocarbon pool" active species; the pre-hydrocarbon pooling regeneration catalyst leaves the pre-hydrocarbon pooling facility and enters a conversion reactor for recycling. By means of arranging a pre-hydrocarbon pooling facility, and performing "pre-hydrocarbon pooling" treatment on a regenerated catalyst, causing the regenerated catalyst to form a "hydrocarbon pool" active species and coke before entering the conversion reactor, the distribution of active species and coke deposits in the "hydrocarbon pool" of the catalyst in the conversion reactor is improved, thereby shortening or eliminating the "induction period" of the conversion reaction, improving the catalytic activity and selectivity of the regenerant oxygenate to produce a low-carbon olefin.