Patent ID: 11872549
Assignee: DALIAN INSTITUTE OF CHEMICAL PHYSICS, CHINESE ACADEMY OF SCIENCES
Field: Chemical engineering (Chemistry)
Classification: CPC B  C  Y | IPC B  C

Claim 8:
9. A method for preparing low-carbon olefins, wherein the method for preparing low-carbon olefins comprises preparing low-carbon olefins using the device according to claim 5;
the method for preparing low-carbon olefins comprises preparing low-carbon olefins from an oxygen-containing compound, wherein an on-line modification of a dimethyl ether/methanol to olefins (DMTO) catalyst through a coke control reaction is performed using the fluidized bed reactor; wherein the method comprises the following step: feeding a catalyst and a coke control raw material into the coke control zone, wherein the catalyst reacts with the coke control raw material while flowing in an annular direction along the coke control zone subzones to generate a product comprising a coke controlled catalyst, and the coke controlled catalyst is a modified DMTO catalyst;
the method for preparing the low-carbon olefins further comprises the following steps:
allowing a spent catalyst in the reaction zone of the fluidized bed reactor to enter the fluidized bed regenerator and undergo a regeneration treatment to generate a regenerated catalyst, and allowing the regenerated catalyst to enter the coke control zone of the fluidized bed reactor and to contact and react with the coke control raw material.