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

Abstract

The invention discloses a catalyst regeneration method used for reducing carbon dioxide release and improving selectivity. The catalyst regeneration method comprises following steps: a carbon-containing catalyst is subjected to partial regeneration in a first regenerator using pure oxygen, and then is delivered into a second regenerator via a U-shaped delivery pipe so as to remove residual coke via combustion using pure oxygen, and smoke obtained from the first regenerator is divided into three parts, wherein a first part of the smoke is cycled into the bottom of the second regenerator, a second part is used for delivering the partially regenerated catalyst from the first regenerator into the second regenerator, and the third part is delivered into a smoke energy recovery system; smoke obtained from the second regenerator and the smoke which is obtained from the first regenerator and is processed via the smoke energy recovery system are combined, are delivered into a carbon dioxide separating system for carbon dioxide separation, and then are collected, and an obtained regenerated catalyst is cooled and activated using a catalyst, and is delivered into a reactor for recycling. The catalyst regeneration method is capable of realizing complete regeneration of the catalyst, reducing carbon release greatly, and even realizing zero carbon release. Catalyst activity distribution is more uniform, so that catalytic cracking product coke yield and dry gas yield are reduced.

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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