A catalyst regeneration method that reduces carbon dioxide emissions and improves selectivity

Abstract

The invention discloses a catalyst regeneration method capable of reducing carbon dioxide discharge and improving selectivity. The catalyst regeneration method is characterized in that a catalyst with coke is subjected to pure oxygen-based partial regeneration in a first regenerator, and the partially regenerated catalyst goes through a lifting pipe, then is fed into a second regenerator above the first regenerator and then is subjected to pure oxygen-based residual coke burning; flue gas discharged from the first regenerator is divided into two parts, one of the two parts is circularly supplied to the bottom of the second regenerator and the other part of the two parts is fed into a flue gas energy recovery system; flue gas discharged from the second regenerator and the first regenerator flue gas discharged from the flue gas energy recovery system are mixed and the mixed flue gas is fed into a carbon dioxide separation system; after carbon dioxide separation, a capturing process is carried out; and the regenerated catalyst is cooled and activated and then is fed into a reactor for recycle. The catalyst regeneration method realizes complete regeneration of a catalyst and uniform distribution of catalyst activity so that coke as a catalytic cracking by-product and a dry gas yield are reduced. The catalyst regeneration method greatly reduces carbon emission and even realizes zero emission of carbon.

Description

technical field [0001] The invention relates to a method for regenerating carbon-containing catalysts in hydrocarbon processing. More specifically, the present invention relates to a catalyst regeneration method for reducing carbon dioxide emissions and improving catalyst selectivity in the heavy oil catalytic cracking process. Background technique [0002] Today, the development of the global oil refining industry is facing many challenges such as oil price fluctuations, the trend of worsening crude oil quality, improved oil product quality specifications, stricter requirements for energy conservation and emission reduction, and the rapid development of biofuels. Reducing carbon dioxide emissions and mitigating climate change have become the key factors for the oil refining industry to transform the economy. The way of growth and the only way to maintain sustainable development. In October 2009, the country announced the action goal of controlling greenhouse gas emissions,...

AI Technical Summary

Problems solved by technology

For example, the highest activity recovery of the regenerated catalyst can be achieved during regeneration, but when the regenerated catalyst participates in the reaction, it may cause high coke and dry gas yields due to its high activity, which is undesirable

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