Pyrolysis gasoline C6-C8 fraction hydrofinishing catalyst and preparation method

A C6-C8, pyrolysis gasoline technology, applied in the field of pyrolysis gasoline secondary refining treatment catalyst and preparation, can solve the problems of poor catalyst stability, reduced catalyst activity selectivity, low catalyst hydrogenation activity, etc.

Active Publication Date: 2019-02-12
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

CN1353168A discloses a catalyst suitable for the second-stage hydrofining of pyrolysis gasoline and its preparation method. The alumina precursor is used to add a high polymer and the IV subgroup metal to obtain a molded carrier after drying and roasting. Immerse in ammonia co-impregnation solution containing Mo, Co, and Ni active components, dry at 100-120°C, and activate at 400-700°C in air to obtain a catalyst, which can adjust the acidity and alkalinity of the carrier and inhibit the coking and deactivation speed of the catalyst. The low specific surface area of ​​the carrier leads to low hydrogenation activity of the catalyst
And pyrolysis gasoline when using 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

[0019] 1. Preparation of nickel-doped lanthanum ferrite

[0020] 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.

[0021] 2. Preparation of silica-alumina carrier

[0022] 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

[0026] 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 molybdenum oxide content of catalyst 2 is 21.3%, the cobalt oxide content is 0.2%, the nickel oxide content is 4.5%, the potassium oxide content is 0.2%, and the silicon oxide-alumina carrier content is 73.8wt %.

Embodiment 3

[0028] 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 molybdenum oxide content of catalyst 3 is 11.7%, the cobalt oxide content is 1.2%, the nickel oxide content is 7.1%, the potassium oxide content is 1.7%, and the silicon oxide-alumina carrier content is 78.3wt %.

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PUM

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Abstract

The invention relates to a pyrolysis gasoline C6-C8 fraction hydrofinishing catalyst. The catalyst takes molybdenum, cobalt, nickel and potassium as active components, and silicon oxide-aluminum oxideas a carrier. Measured by the total weight of the catalyst, the catalyst comprises 6-22% of molybdenum oxide, 0.1-2.2% of cobalt oxide, 4.0-7.2% of nickel oxide, 0.1-3.0% of potassium oxide, and 75-88w% of the silicon oxide-aluminum oxide carrier. In the carrier, mesopores account for 3-70% of total pores, and macropores account for 1.5-55% of the total pores. The catalyst has good colloid resistance and high arsenic resistant, sulphur resistant and water resistant abilities.

Description

technical field [0001] The invention relates to the field of oil refining and chemical industry, and relates to a catalyst for the second-stage refining treatment of pyrolysis gasoline and a preparation method thereof. Background technique [0002] With the improvement of ethylene production capacity, ethylene by-product pyrolysis gasoline also increases, and pyrolysis gasoline includes C5-C10 fractions. In the prior art, two-stage hydrogenation technology is generally used for the treatment of pyrolysis gasoline fractions. The first stage of pyrolysis gasoline is selective hydrogenation, and the purpose is to generate active components (such as alkynes, diolefins and alkenyl aromatics) therein. Corresponding monoolefins and alkyl aromatics, use noble metal hydrogenation catalysts or non-noble metal Ni-based catalysts to saturate these active unsaturated components in oil products at lower temperatures to reduce coking in the second-stage catalyst bed, thereby To ensure the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/887B01J35/04C10G45/08
CPCC10G45/08B01J23/002B01J23/8872B01J2523/00C10G2300/1037B01J35/56B01J2523/13B01J2523/22B01J2523/31B01J2523/3706B01J2523/41B01J2523/68B01J2523/842B01J2523/847
Inventor 陈明海施清彩陈新忠庄旭森
Owner 泉州市利泰石化科技有限公司
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