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A method for selective hydrogenation of whole distillates of pyrolysis gasoline

A pyrolysis gasoline and selective technology, applied in the field of selective hydrogenation of petroleum hydrocarbons, can solve the problems of weak anti-interference ability, poor stability, low low temperature activity of catalysts, etc.

Active Publication Date: 2020-11-27
陈明海
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN200610118522.7 relates to a nickel catalyst with composite pore structure used for selective hydrogenation, which mainly solves the low-temperature activity of the catalyst in the prior art, weak anti-interference ability, low gel capacity, poor stability, and resistance to free water Technical issues with poor performance

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 lanthanum nitrate in 120mL water, add citric acid and stir to dissolve; then add 4.79mol iron nitrate, then add 190g sodium polyacrylate, then add 42g nickel nitrate aqueous solution, continue stirring for 30min, after drying Drying, roasting and grinding to obtain nickel-doped lanthanum ferrite.

[0024] 2. Preparation of silica-alumina carrier

[0025] Add citric acid to 4.5 g of nickel-doped lanthanum ferrite for later use. Add 300g of pseudo-boehmite powder and 25.0g of fenugreek powder into a kneader, add nitric acid, then add 40.2g of sodium polyacrylate nitric acid solution, and mix well, then add nickel-doped lanthanum ferrite, mix well, and get Alumina precursor. Dissolve 5g of sodium polyacrylate in nitric acid, then add 38g of microsilica powder and 50g of pseudoboehmite powder, and stir evenly to obtain a mixture of microsilica powder-pseudoboehmite-sodiu...

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, and the preparation of the silica-alumina carrier is the same as in Example 1. The silica-alumina carrier contains 4.4wt% of silicon oxide, 5.7wt% % nickel-doped lanthanum ferrite, 1.2wt% magnesium, carrier mesopores accounted for 63.8% of the total pores, and macropores accounted for 25.9% 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 catalyst 2 is the same as that of Example 1. The content of catalyst 2 is 11.4wt% of nickel oxide, 4.75wt% of molybdenum oxide and 1.4wt% of magnesium oxide.

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, and the preparation of the silica-alumina carrier is the same as in Example 1. The silica-alumina carrier contains 8.4wt% of silicon oxide, 2.6wt% The nickel-doped lanthanum ferrite, 2.1wt% magnesium, the support mesopores accounted for 54.9% of the total pores, and the macropores accounted for 33.1% of the total pores. The unit content of polyacrylic acid in the alumina precursor is 3.3 times higher than that in the silicon source-organic polymer mixture. The preparation method of catalyst 3 is the same as that of Example 1. The content of catalyst 3 is 22.3wt% of nickel oxide, 4.1wt% of molybdenum oxide and 0.32wt% of magnesium oxide.

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Abstract

The invention relates to an all-fraction selective hydrogenation method for pyrolysis gasoline. The all-fraction selective hydrogenation method includes procedures of carrying out reduction on nickelcatalysts in the presence of hydrogen under the condition of the temperature of 400-500 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 45-110 DEG C, the reaction pressures of 2.0-4.5 MPa and the hydrogen-oil volume ratios of 60-200:1. The liquid volume space velocities are 2.0-5.5 h<-1>; the catalysts comprise silicon oxide-aluminum oxide carriers and metal active components including nickel, molybdenum and magnesium, and the metal active components are loaded on the carriers. The all-fraction selective hydrogenation method has the advantage that the catalysts are good in colloid resistance, high in arsenic resistance, sulfur resistance and water resistance and applicable to long-period stable operation of devices.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/38
CPCC10G45/38C10G2300/1037
Inventor 陈明海施清彩陈新忠庄旭森
Owner 陈明海
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