First-stage selective hydrogenation method for pyrolysis gasoline

A pyrolysis gasoline, selective technology, applied in the direction of selective hydrofining, petroleum industry, treatment of hydrocarbon oil, etc., can solve the problems of poor catalyst stability, nickel aluminate formation, reduced catalyst activity selectivity, etc.

Active Publication Date: 2019-02-19
陈明海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Al 2 o 3 When used as a carrier, in the process of reducing nickel ions at high temperature, it is easy to cause the formation of nickel aluminate, thereby reducing the catalyst activity selectivity and poor catalyst stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] 1. Preparation of nickel-doped lanthanum ferrite

[0023] Under stirring conditions, dissolve 2.51mol of lanthanum nitrate in 120mL of water, add citric acid and stir to dissolve; then add 4.79mol of ferric nitrate, then add 190g of sodium polyacrylate, then add an aqueous solution containing 42g of nickel nitrate, continue to stir for 30 minutes, after drying Drying, roasting and grinding to obtain nickel-doped lanthanum ferrite.

[0024] 2. Preparation of silica-alumina carrier

[0025] Add citric acid to 4.5g nickel-doped lanthanum ferrite for use. Add 300g pseudo-boehmite powder and 25.0g sesame powder into the kneader, add nitric acid, then 40.2g sodium polyacrylate nitric acid solution, and mix well, then add nickel-doped lanthanum ferrite and mix well to obtain Alumina precursor. 5g of sodium polyacrylate is dissolved in nitric acid, then 38g of silica powder and 50g of pseudo-boehmite powder are added, and stirred evenly to obtain a mixture of silica powder-pseudo-b...

Embodiment 2

[0029] The preparation of nickel-doped lanthanum ferrite is the same as in Example 1, except that 260g of sodium polyacrylate is added. The preparation of the silica-alumina support is the same as in Example 1. The silica-alumina support contains 4.4wt% silica, 5.7wt% % Nickel doped lanthanum ferrite, 1.6wt% potassium, the mesopores of the carrier accounted for 64.2% of the total pores, and the macropores accounted for 25.6% of the total pores. The unit content of sodium polyacrylate in the alumina precursor is 3 times higher than the content of sodium polyacrylate in the silicon source-organic polymer mixture. The preparation method of the catalyst 2 was the same as that of Example 1. The content of nickel oxide of catalyst 2 was 10.3 wt%, the content of molybdenum oxide was 5.28 wt%, and the content of potassium oxide was 2.1 wt%.

Embodiment 3

[0031] The preparation of nickel-doped lanthanum ferrite is the same as in Example 1, except that 220g of polyacrylic acid is added. The preparation of the silica-alumina support is the same as in Example 1. The silica-alumina support contains 8.4wt% silica, 2.6wt% The nickel doped lanthanum ferrite, 0.8wt% potassium, the carrier mesopores accounted for 54.6% of the total pores, and the macropores accounted for 33.5% of the total pores. The unit content of polyacrylic acid in the alumina precursor is 3.3 times higher than the content of polyacrylic acid in the silicon source-organic polymer mixture. The preparation method of the catalyst 3 was the same as that of Example 1. The content of nickel oxide of catalyst 3 was 21.1 wt%, the content of molybdenum oxide was 3.3 wt%, and the content of potassium oxide was 0.30 wt%.

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Abstract

The invention relates to a first-stage selective hydrogenation method for pyrolysis gasoline. The first-stage selective hydrogenation method is implemented by the aid of heat-insulation bed reactors.The first-stage selective hydrogenation method includes carrying out reduction on nickel catalysts in the presence of hydrogen under the condition of the temperature of 400-480 DEG C; carrying out cooling and passivation and then carrying out adjustment until reaction technological conditions are met. The reaction technological conditions include the reaction inlet temperatures of 45-120 DEG C, the reaction pressures of 2.5-5.5 MPa and the hydrogen-oil volume ratios of 60-220:1. The liquid volume space velocities are 2.0-6.5 h<-1>; the catalysts comprise silicon oxide-aluminum oxide carriers and metal active components including nickel, molybdenum and potassium, and the metal active components are loaded on the carriers. The first-stage selective hydrogenation method has the advantage thatthe catalysts are applicable to first-stage selective hydrogenation for the pyrolysis gasoline.

Description

Technical field [0001] The invention relates to a selective hydrogenation method of pyrolysis gasoline, in particular to a one-stage selective hydrogenation method of pyrolysis gasoline. Background technique [0002] Pyrolysis gasoline is an important by-product of steam cracking industry to produce ethylene and propylene, including C5-C10 fractions. The composition of pyrolysis gasoline is very complex, mainly including benzene, toluene, xylene, mono-olefins, di-olefins, linear alkanes, cycloalkanes, and organic compounds of nitrogen, sulfur, oxygen, chlorine and heavy metals. There are more than 200 components in total. Benzene, toluene, xylene (collectively referred to as BTX) are about 50-90%, and unsaturated hydrocarbons are 25-30%. According to the characteristics of pyrolysis gasoline containing a large amount of aromatic hydrocarbons, it has a wide range of uses. It can be used as a blending component of gasoline to produce high-octane gasoline, or it can be separated to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10G45/38
CPCC10G45/38C10G2300/1037
Inventor 陈明海陈新忠施清彩庄旭森
Owner 陈明海
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