In-fluid-bed reactivation method for catalyst for direct preparation of low-carbon olefins from synthesis gas

Abstract

The invention relates to an in-fluid-bed reactivation method for catalyst for direct preparation of low-carbon olefins from synthesis gas. In-fluid-bed reactivation method for catalyst with reduced activity comprises following steps: removing heavy wax adsorbed at least part of catalyst surface under high temperature and normal pressure by inert gas, then regenerating for a first time the catalyst with reduced activity by mixed gas of inert gas and hydrogen gas, and reactivating for the second time the catalyst with mixture of inert gas, carbon oxide and low carbon olefin in a proper condition. The activity of the reactivated catalyst can be restored to a level before the activity declines. The reactivation in fluid bed can be easily switched from reaction state to reactivation state, and then switched to the reaction state after the reactivation. The reactivation method is suitable for but is not limited to catalyst reactivation for large-scaled fluid bed synthetic gas for direct preparation for low carbon olefin.

Description

Technical field [0001] The invention relates to a regeneration method for directly preparing a low-carbon olefin iron-based catalyst from a fluidized bed synthesis gas. Background technique [0002] The Fascher-Tropsch synthesis is the use of syngas (the main components are CO and H 2 ) The process of synthesizing hydrocarbons under the action of catalysts is an important way of indirect liquefaction of coal and natural gas. This method was invented by German scientists Frans Fischer and Hans Tropsch in 1923. It is a process in which CO undergoes a heterogeneous catalytic hydrogenation reaction on a metal catalyst to produce a mixture of linear alkanes and olefins. [0003] Germany started the research and development of Fischer-Tropsch synthesis in the 1920s, and realized industrialization in 1936. After World War II, it was closed because it could not compete with the oil industry economically; South Africa has abundant coal resources, but oil resources The lack of plaques and t...

AI Technical Summary

Problems solved by technology

However, during the regeneration process of the Fischer-Tropsch synthesis catalyst, when the reaction atmosphere and operating conditions are not adjusted properly, there will be serious over-temperature phenomena, which will lead to a decline in the performance of the Fischer-Tropsch synthesis catalyst.

So far, we have not seen any reports on in-situ regeneration of catalysts in fluidized beds to restore their activity to the original level.

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