Catalytic cracking catalyst demetallated reactivating process

Abstract

A method for removing metals and reactivating catalytic cracking agent includes: 1) mixing acidifier composition liquid with catalytic cracking catalyst at liquid-solid ratio of (2 - 10): 1, stirring at atmosphere - 200degC for 1 - 24 hours; 2) filtering the slurry and beating the obtained cakes with deionized water at atmosphere - 100degC for 10 minutes to 6 hours under pH 3.0 - 7.0 controlled with ammonia, and filtering the obtained slurry; 3) beating the obtained cakes from the above step 2 with activated ion composition liquid at liquid-solid ratio of (2 - 10):1 at the same temperature above for 10 minutes to 5 hours, filtering the slurry and recovering the processed catalysts. Its advantages include simple procedure, less investment and short recovery period, to remove pollutant metals and to improve activity and selectivity of the products.

Description

technical field [0001] The invention belongs to the general regeneration or reactivation method of catalyst, more specifically, it is a demetallization reactivation method for catalytic cracking catalyst. Background technique [0002] During the catalytic cracking process, metals such as Ni, V, Fe, Cu, etc. in the raw oil are gradually deposited on the catalyst. With the increase of the amount of metal on the catalyst, the activity of the catalyst decreases and the selectivity becomes poor. In product distribution, the yields of hydrogen, dry gas, and coke increased, while the yields of target products such as liquefied gas and gasoline decreased. In industrial catalytic cracking production, there are two main methods to solve the problem of metal pollution, one is to reduce the level of metal pollution by discharging part of the balancer and replenishing fresh agent; the other is to use anti-metal catalysts and / or metal deactivators. As the crude oil becomes heavier, catal...

AI Technical Summary

Problems solved by technology

The method is simple to operate, can reduce the heavy metal content of the catalyst, and increase the number of acidic active centers of the catalyst, but it has been proved by experiments that the demetallization regeneration effect of the method is not ideal (see comparative example 1)