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Hydrodesulfurization method of catalytic cracking gasoline

A technology for catalytic cracking gasoline and hydrodesulfurization, which is applied in chemical instruments and methods, chemical elements of heterogeneous catalysts, catalysts for physical/chemical processes, etc., and can solve the problems of complex structure and long reaction time of layered composite hydroxides. , to achieve long-term stable operation, low octane loss, and mild reaction conditions

Active Publication Date: 2017-05-10
LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with the co-precipitation method, although the invention uses two precipitations, the specific surface area of ​​the prepared LDH material is higher, but the reaction time of the invention is longer, and the reaction time given in the examples is more than 10 hours
The purpose of this invention is to prepare layered composite hydroxide (LDH) with a high specific surface area. The structure of the layered composite hydroxide is complex and may involve a variety of metals or their combinations. The preparation process requires two steps of precipitation respectively, and the reaction time longer

Method used

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  • Hydrodesulfurization method of catalytic cracking gasoline

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Dissolve 1.2kg of zinc nitrate in 6L of water to make a solution containing zinc, and dissolve 0.24kg of sodium metaaluminate and 0.30kg of sodium carbonate in 4L of water to make a solution containing aluminum. Divide the zinc-containing solution into 3 equal parts, each 2L. Take 2L of zinc-containing solution, keep the temperature at 80°C, add aluminum-containing mixed solution dropwise to it until the pH value reaches 9.0; stop dropping the aluminum-containing mixed solution, then add 2L of zinc-containing solution dropwise to the mixing system, and continue to drop aluminum-containing solution Mix the solution until the pH value reaches 9.0; titrate the aluminum-containing mixed solution and the zinc-containing solution alternately until all the zinc-containing solutions are added, and add the aluminum-containing mixed solution dropwise until the pH reaches 9.0. The total titration time is 3 hours. The obtained mixture was aged at 80°C for 4h, cooled and washed unti...

Embodiment 2

[0041] The preparation method and steps of the zinc oxide-alumina composite carrier containing additives are the same as in Example 1, and the zinc oxide containing zinc aluminum spinel is prepared, and the pH value is adjusted to 8.7. In terms of oxides, the content of zinc oxide is 70%; the specific surface area is 191m 2 / g. The difference is that after the composite carrier is obtained, potassium and strontium are used to modify the surface of the zinc oxide-alumina composite carrier containing additives. Potassium nitrate 3.0g, strontium nitrate 3.0g, completely dissolved in 30ml of distilled water, then diluted with deionized water, made into an impregnation solution impregnated with zinc oxide-alumina composite carrier, dried and roasted to obtain the surface with additives potassium and strontium Modified zinc oxide-alumina composite support. The specific surface area of ​​the composite carrier is 233m 2 / g.

[0042] Ammonium molybdate and cobalt nitrate were made ...

Embodiment 3

[0045] The preparation method and steps of the zinc oxide-alumina composite carrier containing additives are the same as in Example 1. Zinc oxide containing zinc aluminum spinel was prepared, and the pH value was adjusted to 9.3. Zinc oxide containing zinc aluminum spinel, calculated as oxide, the content of zinc oxide is 63%; the specific surface area is 214m 2 / g.

[0046] The composite support includes 17wt% zinc oxide containing zinc-aluminum spinel, the content of alumina is 80 wt%, and the contents of boron, potassium and strontium in the additive components are B 2 o 3 1.2 wt%, K 2 O 0.9 wt%, SrO 0.9 wt%. Composite carrier specific surface area 259m 2 / g.

[0047] Ammonium molybdate and cobalt nitrate were made into an impregnation solution, and ammonia water was added to adjust the pH value so that the salt was completely dissolved, and then the zinc oxide-alumina composite carrier surface-modified with auxiliary agents potassium and strontium was impregnated. T...

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Abstract

The invention relates to a hydrodesulfurization method of catalytic cracking gasoline. A fixed bed reactor is adopted, wherein the catalyst is a supported cobalt-molybdate catalyst; and the hydrodesulfurization method comprises the following technologic conditions: the reaction temperature is 180-310 DEG C, the reaction pressure is 1.5-2.5MPa, the volume velocity is 1.5-3.5h<-1> and the volume ratio of hydrogen to oil is (180-400):1. The hydrodesulfurization method is mild in technologic conditions, high in adaptive capacity on different raw materials, low in octane value loss and high in desulfurization rate.

Description

technical field [0001] The invention relates to a method for hydrodesulfurization of catalytic cracking gasoline, more specifically, using an FCC hydrodesulfurization catalyst supported by a zinc oxide-alumina composite material containing additives for selective desulfurization of catalytic cracking gasoline Hydrogen desulfurization. Background technique [0002] Since the sulfur content of catalytic cracking gasoline is generally 100-500v%, there are even high-sulfur and high-olefin feed oils, the sulfur content is above 500mg / kg, and the olefin content exceeds 40%. Selective hydrodesulfurization technology will inevitably cause partial saturation of olefins and lower octane number during deep hydrodesulfurization, which requires hydrodesulfurization catalyst to desulfurize while avoiding excessive loss of octane number as much as possible. [0003] Composite materials of zinc oxide and alumina are often used as desulfurization catalytic materials in the field of hydrodes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/08B01J23/887
CPCB01J23/002B01J23/8873B01J2523/00C10G45/08C10G2300/202C10G2300/305C10G2400/02B01J2523/13B01J2523/24B01J2523/27B01J2523/305B01J2523/31B01J2523/68B01J2523/845
Inventor 牟晓红夏德强周艳青唐蓉萍田苗郑晓明王守伟
Owner LANZHOU PETROCHEM COLLEGE OF VOCATIONAL TECH
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