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Catalytic cracking auxiliary agent for reducing sulfur content in gasoline and preparation method thereof

A catalytic cracking aid, catalytic cracking technology, applied in catalytic cracking, cracking, petroleum industry and other directions, can solve the problems of high processing cost, harsh operating conditions, high operating cost, achieve excellent hydrothermal stability, convenient preparation process, The effect of reducing the sulfur content of gasoline

Inactive Publication Date: 2008-03-26
EAST CHINA UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydrogenation pretreatment of FCC raw oil can reduce the sulfur content of FCC gasoline and distillate oil at the same time, but the operating conditions of hydrogenation are harsh, and a new pretreatment device must be established, the treatment cost is high, and the octane number of gasoline will be affected by olefins. Saturated and reduced; the use of gasoline desulfurization additives to reduce the sulfur content of FCC gasoline is flexible and does not require additional equipment investment. It is undoubtedly an economical and flexible measure for enterprises with a small excess of sulfur content in FCC gasoline. For FCC gasoline For enterprises whose sulfur content seriously exceeds the standard, this measure can also effectively reduce the blending pressure of outgoing gasoline; although the post-treatment process has high desulfurization efficiency, it has a large investment and high operating costs, and its industrialization will take some time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038]Prepare a mixed salt solution of zinc sulfate and aluminum nitrate with deionized water, wherein the molar concentration of zinc ions is 1.06M, and the molar concentration of aluminum ions is 0.53M; prepare a mixed alkali solution with sodium hydroxide and anhydrous sodium carbonate, wherein the hydroxide The sodium concentration is 1.2M and the anhydrous sodium carbonate concentration is 0.6M. At room temperature, add the mixed alkali solution dropwise to the mixed salt solution, the dropping time is 1.5 hours, the pH value of the solution is controlled at 10, after the dropping is completed, continue to stir at 95°C for 3 hours to nucleate and crystallize, then cool , suction filtration, washing until neutral, and vacuum drying at 70°C for 16 hours to obtain zinc-aluminum hydrotalcite. The above was calcined at 800° C. for 2 hours, and naturally cooled to room temperature to obtain zinc-aluminum spinel and uniformly dispersed zinc oxide oxide. The specific surface of ...

Embodiment 2

[0040] Prepare a mixed salt solution of zinc nitrate and aluminum nitrate with deionized water, wherein the molar concentration of zinc ions is 1.2M, and the molar concentration of aluminum ions is 0.4M; prepare a mixed alkali solution with sodium hydroxide and anhydrous sodium carbonate, wherein the hydroxide The sodium concentration is 2.6M and the anhydrous sodium carbonate concentration is 0.8M. Add the mixed alkali solution dropwise to the mixed salt solution, the dropping time is 1.5 hours, the pH value of the solution is controlled at 10, after the dropwise addition, continue to stir at 85°C for 6 hours to nucleate and crystallize, then cool, suction filter, Wash until neutral, and dry in vacuum at 70°C for 16 hours to obtain zinc-aluminum hydrotalcite. The above was calcined at 900° C. for 2 hours, and naturally cooled to room temperature to obtain zinc-aluminum spinel and uniformly dispersed zinc oxide oxide. The specific surface of the product obtained is 120m 2 / g...

Embodiment 3

[0042] Prepare zinc chloride and aluminum nitrate mixed salt solution with deionized water, wherein the molar concentration of zinc ions is 1.28M, and the molar concentration of aluminum ions is 0.32M; prepare mixed alkali solution with sodium hydroxide and anhydrous sodium carbonate, in which hydrogen The concentration of sodium oxide is 1.8M, and the concentration of anhydrous sodium carbonate is 0.6M. Add the mixed alkali solution dropwise to the mixed salt solution, the dropping time is 1.5 hours, the pH value of the solution is controlled at 10, after the dropwise addition, continue to stir at 75°C for 10 hours to nucleate and crystallize, then cool, suction filter, Wash until neutral, and dry in vacuum at 70°C for 16 hours to obtain zinc-aluminum hydrotalcite. The above was calcined at 900° C. for 2 hours, and naturally cooled to room temperature to obtain zinc-aluminum spinel and uniformly dispersed zinc oxide oxide. The specific surface of the product obtained is 102m...

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Abstract

The catalytically cracking assistant capable of lowering the sulfur content in gasoline is composite oxide including aluminum zinc spinel, homogeneously distributed zinc oxide and at least one optional RE oxide. It is prepared through roasting the mixture of laminar aluminum zinc in hdrotalcite structure and optional RE oxide hydrate. The preparation process is simple, and the assistant has the features of high dispersion, high specific surface area, etc. The assistant after being formed is mixed with conventional FCC catalyst and / or active reinforcing assistant for application in catalytically cracking process, and has the function of lowering the sulfur content in gasoline and excellent hydrothermal stability.

Description

technical field [0001] The invention relates to a catalytic cracking additive capable of reducing the sulfur content of gasoline and a preparation method thereof, more specifically, a mixture of a zinc-aluminum layered substance with a hydrotalcite-like structure and an optional rare earth hydrated oxide Auxiliary prepared by roasting. [0002] The additive of the present invention can be blended with conventional FCC catalysts and / or activity enhancing additives and used in the catalytic cracking process. Background technique [0003] With the increasing awareness of environmental protection, countries around the world have increasingly stringent quality requirements for vehicle fuels in recent years, and the quality requirements for the sulfur content of finished gasoline are gradually reduced to below 200μg / g, 50μg / g or even 30μg / g. my country's national standard for unleaded gasoline for vehicles (GB17930-1999) requires finished gasoline sulfur ≯800μg / g, after July 1, 2...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G11/02
Inventor 陆善祥欧阳丹霞陈辉王苏许锋于冀勇
Owner EAST CHINA UNIV OF SCI & TECH
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