A reaction-regeneration system for producing light olefins from organic oxygenates

Abstract

The invention discloses a reacting-regenerating system for preparing low-carbon olefin by organic oxygenated chemicals. The reacting-regenerating system comprises a reactor, a regenerator, an inactivated catalyst conveying pipeline and a regenerated catalyst conveying pipeline, wherein the reactor works under 400-550 DEG C; the regenerator works under 600-800 DEG C; the catalyst is regenerated in the regenerator in a carbon-removing manner after being inactivated; and besides, at least one heat exchanger is arranged between the inactivated catalyst conveying pipeline and the regenerator, and used for reducing the difference between the temperature when the inactivated catalyst enters the generator and the working temperature of the regenerator. The reacting-regenerating system disclosed by the invention can be used for effectively solving the problem that catalyst is pulverized and lost due to thermal stress generated by severe temperature difference.

Description

technical field [0001] The invention relates to a reaction-regeneration system for preparing low-carbon olefins from organic oxygen-containing compounds, and also relates to a method for reducing catalyst pulverization loss for preparing low-carbon olefins from organic oxygen-containing compounds. Background technique [0002] The technology of organic oxygen-containing compounds, such as methanol and / or dimethyl ether to produce low-carbon olefins has opened up a new process route for the production of basic organic chemical raw materials from coal. The typical technology is methanol to olefins (MTO), which uses methanol as a raw material to produce olefin mixtures . Generally speaking, the MTO technology package consists of reaction technology and separation technology. Reaction technology is centered on catalyst development and reactor development and design; while product distribution and purity requirements are the basis for developing separation processes. [0003] T...

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Problems solved by technology

[0008] CN101811071B discloses a control method for deactivated catalyst burning charcoal regeneration in the process of methanol to olefins, the method controls the oxygen content of the regeneration combustion medium by adding an auxiliary combustion chamber, thereby improving the charcoal burning efficiency of the deactivated catalyst, and then improving the efficiency of the deactivated catalyst regeneration ability, and ultimately achieve the purpose of increasing the yield of low-carbon olefins, but this document does not involve how to avoid the problem of catalyst pulverization loss

[0010] However, so far, a good way to reduce the pulverization loss of the catalyst during the reaction-regeneration process has not been found.

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