A kind of pyrolysis gasoline middle distillate unsaturated hydrocarbon selective hydrogenation method

A technology for middle distillate and pyrolysis gasoline is applied in the field of one-stage selective hydrogenation of pyrolysis gasoline, which can solve the problems of low gel-holding capacity, poor stability and low catalyst activity at low temperature.

Active Publication Date: 2021-06-29
泉州市利泰石化科技有限公司
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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 3.8wt% 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 in Example 1. The content of catalyst 3 is 22.3wt% of nickel oxide, 4.1wt% of molybdenum oxide and 2.6wt% of magnesium oxide.

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Abstract

The invention relates to a method for selective hydrogenation of unsaturated hydrocarbons in the middle distillate of pyrolysis gasoline, which includes the following process: nickel catalyst is reduced at 400-500°C in the presence of hydrogen, and adjusted to the reaction process conditions after cooling and passivation: reaction Inlet temperature 45-110°C, reaction pressure 2.0-4.5MPa, hydrogen-oil volume ratio 60-200:1; liquid volume space velocity 2.0-5.5h ‑1 ; The catalyst includes a silica-alumina carrier and metal active components nickel, molybdenum and magnesium loaded on the carrier. The catalyst has good colloidal resistance, strong resistance to arsenic, sulfur and water, and is suitable for long-term stable operation of the device.

Description

technical field [0001] The invention relates to a method for selective hydrogenation of unsaturated hydrocarbons in the middle distillate of pyrolysis gasoline, 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 gas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G45/08C10G45/06B01J23/83B01J35/10
CPCB01J23/83B01J35/10C10G45/06C10G45/08C10G2300/1037
Inventor 陈新忠施清彩陈明海庄旭森
Owner 泉州市利泰石化科技有限公司
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