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A kind of heavy aromatics conversion catalyst and preparation method thereof

A technology for heavy aromatic hydrocarbons and catalysts, which is applied in the field of heavy aromatic hydrocarbon conversion catalysts and their preparation, can solve the problems of increasing catalyst preparation difficulty and economic cost, difficulty in separating ultrafine zeolite, low production efficiency, etc. Conducive to material mass transfer and low cost

Active Publication Date: 2021-03-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above measures will significantly increase the difficulty of catalyst preparation and economic cost, such as the separation of ultrafine zeolite in production is difficult, the production efficiency is low, and the cost increases

Method used

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  • A kind of heavy aromatics conversion catalyst and preparation method thereof
  • A kind of heavy aromatics conversion catalyst and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] At room temperature, under magnetic stirring, mix silica sol, sodium hydroxide, water, and N-methylpiperidine in a certain proportion, then heat in sealed water at 100°C for 24 hours, cool to room temperature, and then add sodium metaaluminate powder Stir well into the above solution. The final material ratio satisfies: Al 2 o 3 / SiO 2 =30, N-methylpiperidine / SiO 2 =0.15,OH - / SiO 2 =0.85,H 2 O / SiO 2 =45. Afterwards, the above mixture was subjected to ultrasonic (0.5KW / L) and magnetic stirring for 2 hours at 40°C, and then placed in a reactor for crystallization at 175°C for 100 hours. The obtained product was washed with distilled water, dried at 120°C for 12 hours, and then calcined at 550°C for 5 hours.

[0032] Immerse an appropriate amount of the above-mentioned molecular sieve powder in 5 times its volume of 2mol / L ammonium nitrate solution, wherein the molar ratio of acetic acid / ammonium nitrate in the ammonium nitrate solution is 0.1, stir and exchange ...

Embodiment 2

[0035] At room temperature, under magnetic stirring, mix silica sol, sodium hydroxide, water, and N-methylpiperidine in a certain proportion, then heat in sealed water at 120°C for 12 hours, cool to room temperature, and prepare the spare sodium metaaluminate powder Add to the pretreated silicon source solution and stir evenly. The final material ratio satisfies: Al 2 o 3 / SiO 2 =60, N-methylpiperidine / SiO 2 =0.25,OH - / SiO 2 =0.72,H 2 O / SiO 2 =40. Afterwards, the above mixture was ultrasonicated (1.0 KW / L) and stirred for 2 hours at 50°C, and then placed in a reaction kettle for crystallization at 185°C for 120 hours. The obtained product was washed with distilled water, dried at 150°C for 5 hours, and then calcined at 550°C for 5 hours.

[0036] The above-mentioned molecular sieve powder is immersed in an appropriate amount in 5 times its volume of 2mol / L ammonium nitrate solution, wherein the molar ratio of citric acid / ammonium nitrate in the ammonium nitrate solut...

Embodiment 3

[0039] At room temperature, under magnetic stirring, mix white carbon black, sodium hydroxide, water, and N-methylpiperidine according to a certain ratio, then heat in sealed water at 80°C for 24 hours, and cool to room temperature. Add the sodium metaaluminate powder into the silicon source solution and stir evenly. The final material ratio satisfies: Al 2 o 3 / SiO 2 =55, N-methylpiperidine / SiO 2 =0.25,OH - / SiO 2 =0.70, H 2 O / SiO 2 =60. Afterwards, the above mixture was stirred at 60°C for 6 hours, and then placed into a reaction kettle for crystallization at 170°C for 140 hours. The obtained product was washed with distilled water, dried at 120°C for 12 hours, and then calcined at 550°C for 5 hours.

[0040] Immerse the above-mentioned molecular sieve powder in an appropriate amount in 5 times the volume of 4mol / L ammonium chloride solution, wherein the molar ratio of acetic acid / ammonium nitrate in the ammonium nitrate solution is 0.5, stir and exchange at 25°C fo...

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Abstract

The invention discloses a heavy aromatic conversion catalyst. The heavy aromatic conversion catalyst comprises small-particle hydrogen mordenite in a two-dimensional sheet state, the size of the small-particle hydrogen mordenite in the long-dimensional direction is 200-1000 nm, the sheet thickness of the small-particle hydrogen mordenite in the short-dimensional direction is 5-60 nm, the pyridineabsorption infrared total acid of the small-particle hydrogen mordenite is 0.5-1.35 mmol / g, and the B acid distribution of the small-particle hydrogen mordenite is 45-70%. The preparation method of the heavy aromatic conversion catalyst comprises (1) uniformly mixing a silicon source, an alkali source, N-methylpiperidine and water, performing hydro-thermal treatment on the mixed materials in a sealed state, cooling the materials down to room temperature, and then uniformly mixing an aluminum source into the hydro-thermal-treated materials; (2) aging, crystallizing, washing, drying and baking the materials obtained in the step (1), fully soaking the baked powder in an organic acid-inorganic ammonium salt aqueous solution, and performing drying, baking and forming process to obtain the heavyaromatic conversion catalyst. The heavy aromatic conversion catalyst is high in heavy aromatic conversion ability and BTX (benzene-toluene-xylene) yield.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve synthesis and chemical catalysis, and in particular relates to a heavy aromatics conversion catalyst and a preparation method thereof. Background technique [0002] Heavy aromatics mainly refer to aromatics above C9, which mainly exist in catalytic reforming products and pyrolysis gasoline obtained by cracking hydrocarbons to produce ethylene. At present, a small part of heavy aromatics is used as solvents, and most of the rest are used as fuels, with low economic value. In recent years, with the continuous expansion of refining and chemical units, the amount of heavy aromatics by-products is still increasing every year. Therefore, how to utilize heavy aromatics more effectively is an important problem to be solved urgently. [0003] USP 4,341,622 discloses a method for converting heavy aromatics to BTX. The method uses a bifunctional catalyst comprising molecular sieves and active meta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/18
CPCB01J29/18
Inventor 杨卫亚凌凤香沈智奇郭长友季洪海王丽华王少军张会成
Owner CHINA PETROLEUM & CHEM CORP
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