Catalytic cracking regeneration flue gas sulphur transfer agent and preparation method thereof

Abstract

The invention discloses a catalytic cracking recycling flue gas sulfur transfer agent and a preparation method, and is characterized in that the sulfur transfer agent is obtained by first forming a high built content serosity that takes MgO and pseudo-boehmite as active group component, takes chlorate of zinc, iron, and cerium as oxidation and reduction promoter, and takes sodium hydroxide as general precipitant, and then anion clay is thermally compounded by water with high temperature, finally, the anion clay is filtered, washed, dried, and roasted. The invention has the advantages that: (1) the serosity has high built content and is beneficial to improving compounding efficiency of the anion clay and reducing discharge of waste water; (2) harmful contamination in the waste water can be avoided by adopting the material of the invention to prepare the anion clay, thus being in favor of the environmental protection; (3) the obtained FCC recycling flue gas sulfur transfer agent has highly efficient SO< X > absorbing and desorbing properties.

Description

technical field [0001] The invention relates to catalytic cracking regenerated flue gas sulfur transfer agent and a preparation method thereof, in particular to an anionic clay-type sulfur transfer agent with a hydrotalcite-like structure and a preparation method thereof. Background technique [0002] Fluid Catalytic Cracking (FCC) is one of the main methods for refineries to produce high-value light oils such as gasoline and diesel. FCC units usually consist of a riser and a regenerator. In the production process, cracking catalyst microspheres with cracking activity and heavy raw oil are subjected to high-temperature cracking in the riser reactor to generate light oil and gas products. At the same time, the cracking catalyst is also deactivated due to coking. The deactivated catalyst needs to enter the regenerator to burn at high temperature to regenerate the catalyst. Because the coke on the surface of the catalyst contains a large amount of sulfide, a large amount of S...

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Problems solved by technology

And the divalent metal salt and aluminum salt that the preparation method of anionic clay mainly adopts are as starting material, and this is particularly unfavorable to actual production process: the first, soluble metal salt is more expensive; Small (colloid type), filtration and washing are more difficult; third, the use of salt is usually soluble nitrate, sulfate, which means the presence of a large number of anions, and these anions must be washed (produced with a large amount of nitrate, sulfuric acid) discharge of wastewater such as salt) or discharge as environmentally harmful gases (such as nitrogen oxides, sulfur oxides) during roasting; fourth, the solid content of the slurry is relatively low in this preparation method, and the solid content of the slurry is generally less than 10%

[0009] At present, some domestic research institutes and oil refineries have carried out the development of sulfur transfer agent with magnesium aluminum spinel as the main component (CN1721061A, CN1216685C, CN1101247C), but Both have the disadvantages of low desulfurization efficiency, slow adsorption rate, and the presence of toxic and harmful metal vanadium.

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