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A method for hydrodearsenication of naphtha

A naphtha and arsenic removal technology, which is applied in the petroleum industry, processing hydrocarbon oil, refining to remove heteroatoms, etc. problems, to achieve the effect of reducing the hydrothermal treatment process, wide application range of raw materials, and good activity stability

Active Publication Date: 2018-04-20
山东明成石化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to the complex composition of liquid naphtha hydrocarbons, the requirements for arsenic removal agents are relatively high. In the above-mentioned naphtha arsenic removal process, there are low arsenic capacity, poor hydrogenation dearsenic activity, poor resistance to impurities, and easy deactivation of the catalyst. Problems such as short running cycle

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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

[0048] The preparation method and steps of the composite carrier containing zinc oxide-alumina 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.

[0049] The composite carrier includes 32wt% of zinc oxide containing zinc-aluminum spinel, 66wt% of alumina, and the contents of phosphorus, potassium and magnesium in the auxiliary components are P 2 o 5 0.6wt%, K 2 O 0.8wt%, MgO 0.6wt%.

[0050] The difference is that after the composite carrier is obtained, the composite carrier containing zinc oxide-alumina is modified by using potassium and magnesium. , magnesium nitrate, completely dissolved in 30ml of distilled water, then diluted with deionized water, made into a solution and sprayed with a composite carrier of zinc oxide-alumina, so that the content of potassium and magnesium on the outside of the...

Embodiment 3

[0055] The preparation method and steps of the composite carrier containing zinc oxide-alumina 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.

[0056] The composite carrier includes 18.3wt% of zinc oxide containing zinc-aluminum spinel, 79wt% of alumina, and the contents of phosphorus, potassium and magnesium in the auxiliary components are P 2 o 5 0.9wt%, K 2 O 0.8wt%, MgO 1.0wt%. Composite carrier specific surface area 242m 2 / g.

[0057] Take nickel nitrate, ammonium molybdate and ammonium metatungstate to prepare an impregnating solution, and impregnate 100 g of a composite carrier containing zinc oxide-alumina. The specific steps are the same as in Example 1. The catalyst was dried at 130° C. for 6 hours and then calcined at 600° C. for 6.0 hours to o...

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Abstract

The invention discloses a hydrogenating and arsenic removing method of naphtha. A catalyst used by the method comprises, by the mass of oxide, 72.0-90.0wt% of composite support containing zinc oxide-aluminum oxide, 6.0-16.0wt% active component nickel oxide, 2.0-6.0wt% of molybdenum oxide and 2.0-6.0wt% of tungsten oxide. The method is mild in reaction condition, wide in raw material application range, high in product arsenic removing, good in long-period reaction activity stability and long in operation period.

Description

technical field [0001] The present invention relates to a method for hydrogenation dearsenization of naphtha, more specifically, it uses a catalyst for hydrogenation dearsenization with zinc oxide-alumina composite material as a carrier for the hydrogenation dearsenization reaction of naphtha . Background technique [0002] It is well known that arsenic compounds in petroleum hydrocarbons, especially liquid petroleum hydrocarbons, have obvious negative effects on their subsequent processing. The most prominent problem is causing catalyst poisoning. Arsenic compounds are also easy to deposit on the surface of the pipe, corrode the pipe, and cause hidden dangers. In severe cases, arsenic will prevent certain processes from proceeding smoothly. With the improvement of environmental protection requirements and the improvement of harmful gas emission standards, the demand for clean oil products is growing rapidly, especially gasoline, diesel oil, solvent oil and lubricating oi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/08B01J23/888
CPCB01J23/888C10G45/08C10G2300/1044C10G2300/201C10G2300/70
Inventor 晁会霞石海信王爱荣
Owner 山东明成石化有限公司
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