A kind of preparation method of catalytic cracking flue gas desulfurization auxiliary agent

Abstract

The invention provides a preparation method of catalytic cracking flue gas desulfurization additive, which is prepared by impregnating the active component cerium ion on the granular carrier under certain conditions, then adding aluminum sol and / or silica sol, drying and roasting Semi-finished products, which are conducive to the better dispersion of the active components on the carrier, and can also form more acid centers in the carrier to improve reactivity; then impregnate the active component magnesium ions on the semi-finished products, dry, The desulfurization aid is obtained after roasting. In the present invention, the active component of cerium ion is impregnated first, and then the active component of magnesium ion is impregnated after adding aluminum sol and / or silica sol, so that the active component of cerium is fully dispersed in the alumina channel. , and make the magnesium active component form a coating outside the cerium active component. When desulfurization is performed, the desulfurization reaction proceeds in layers, the desulfurization activity is high, the transfer rate of SOx in the flue gas is high, and the service life of the desulfurizer is long.

Description

technical field [0001] The invention relates to a preparation method of catalytic cracking flue gas desulfurization additive, which belongs to the technical field of chemical catalysts. Background technique [0002] Catalytic cracking is one of the important processes of petroleum secondary processing. In the process of catalytic cracking, the catalyst is circulated between the reactor and the regenerator. When leaving the reactor, the catalyst contains about 3-10wt% coke. At this time, the deposited coke needs to be burned off in the regenerator with the help of oxygen in the air to restore the catalytic activity of the catalyst and realize the regeneration of the catalyst. [0003] As the content of sulfur and nitrogen heteroatoms in crude oil increases, the sedimentary coke also contains sulfur and nitrogen. When the catalyst is regenerated in the regenerator under oxygen-enriched conditions, the deposited coke and oxygen undergo a combustion reaction to generate regener...

AI Technical Summary

Problems solved by technology

However, the magnesium active component and the cerium active component in the desulfurization aid prepared by the above method are prone to mutual wrapping, and the active center is covered, so the above desulfurization aid is used for catalytic cracking of SO in flue gas. x When the removal treatment is carried out, its oxidation activity and reduction activity are low, and the SO in the flue gas x The transfer rate is low

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