Regeneration method of coal liquefied oil hydrogenation deactivated catalyst

Abstract

The invention provides a regeneration method of a coal liquefied oil hydrogenation deactivated catalyst, which comprises: (a) a catalyst filling phase in which the hydrogenation catalyst to be regenerated is filled into a rotary kiln regeneration device (1); (b) a low temperature scorching phase in which heated process air with a low oxygen content is injected at a temperature of 200 DEG C-350 DEG C, wherein the oxygen content of the process air is 1-10 vol%, and the gas-agent ratio during the catalyst regeneration reaction is 2000-5000 / h (vol / vol); (c) a transition phase in which the regeneration temperature of the catalyst is firstly increased after the temperature increase of a bed layer in the low temperature scorching phase is not more than 5 DEG C and the content of CO2 and SO2 in the air is less than 0.05 wt%, then the oxygen concentration of the process air is increased; (d) a high temperature scorching phase in which high temperature scorching of the catalyst is carried out at 450 DEG C-470 DEG C when the temperature increase of the bed layer in the transition phase is within 5 DEG C and the content of CO2 and SO2 in the air is less than 0.05 wt%; (e) a purification phase. The method can effectively prevent catalyst deactivation due to heat generated during combustion of a lot of C and S in the deactivated catalyst, reduce equipment investment, and reduce catalyst regeneration cost.

Description

technical field [0001] The invention generally relates to a deactivated catalyst regeneration method for a hydrogenation catalyst, in particular to a method for regenerating a deactivated catalyst for hydrogenation of coal liquefied oil. Background technique [0002] Due to the structural characteristics of hydrocarbons in coal raw materials, the density of oil produced by coal liquefaction is as high as 0.9500g / cm 3 Above, the nitrogen content is as high as 0.28wt%. At the same time, coal liquefied oil contains more colloids, olefins, carbon residues, and polycyclic aromatic hydrocarbons. These coking precursors (or coking precursors) are extremely easy to dehydrogenate, carbonize, and coke at high temperatures. , causing a decrease in catalyst activity, which in turn causes blockage of the reactor bed, resulting in an increase in the pressure drop of the reactor bed. [0003] In view of the above characteristics of coal liquefied oil, the domestic coal liquefied oil hydro...

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Problems solved by technology

[0008] For this reason, the present invention provides a kind of regeneration method aimed at the deactivated catalyst of coal liquefied oil hydrogenation, this method can effectively eliminate the catalyst deactivation caused by the heat generated by the combustion of a large amount of C and S on the deactivated catalyst, and overcome the regeneration Afterwards, the nature of the catalyst deteriorates, the highly dispersed active metals condense, and the catalyst loses a lot of activity. At the same time, it can reduce the investment in equipment and effectively reduce the cost of catalyst regeneration.

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