Regeneration method of molecular sieve catalyst

Abstract

The invention provides a regeneration method of a molecular sieve catalyst, comprising the following steps: roasting a molecular sieve catalyst to be regenerated at 300-750 DEG C to decomposing the carbon deposit in the molecular sieve catalyst to be regenerated into CO2, wherein the roasting step is characterized in that: in the presence of oxygen-containing gas, the molecular sieve catalyst to be regenerated is subject to roasting of multiple stages at a constant temperature, the roasting of multiple stages comprises a first roasting stage and roasting stages after the first roasting stage, the roasting temperature of any one roasting stage after the first roasting stage is 5-70 DEG C higher than that of the adjacent former roasting stage, and the roasting time of each roasting stage is long enough to generate no CO2 when roasting is conducted under the roasting condition of the roasting stage. According to the invention, the performance of the regenerated molecular sieve catalyst is recovered and even better than the performance of a fresh catalyst, thus good regeneration effect can be achieved by using the method disclosed herein.

Description

technical field

[0001] The invention relates to a regeneration method of a molecular sieve catalyst. Background technique

[0002] In recent years, with the growth of my country's demand for propylene, the technologies or processes (such as FCC process and C 4 The production process of producing propylene from olefins as raw materials) is getting more and more attention. In these reaction processes, molecular sieve catalysts are generally used. Since the reaction process for producing propylene is generally carried out at a relatively high temperature, and because the molecular sieve is acidic, the catalyst is prone to decrease in catalytic activity due to the formation of carbon deposits and the continuous accumulation of carbon deposits during the reaction.

[0003] Although the regeneration process of molecular sieve catalysts deactivated by the formation of carbon deposits is based on the principle of oxidative carbon deposits, that is, by burning carbon deposits (comm...

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