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Catalyst for aromatization and quality modification of catalytic gasoline

A technology for catalyzing gasoline and catalysts, applied in physical/chemical process catalysts, molecular sieve catalysts, refined hydrocarbon oils, etc., can solve the problem that the stability cannot meet the needs of aromatization catalysts, etc.

Inactive Publication Date: 2014-03-26
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the stability of ZSM-5 molecular sieves still cannot meet the industrial requirements of aromatization catalysts, and it needs to be modified. The commonly used methods include nanometerization, hydrothermal treatment, ammonia hydrothermal treatment, alkali treatment, mixing of different molecular sieves, phosphorus modification, Metal modification and combined modification with multiple methods, etc. One of these modification methods is to improve the acid strength, acid type and distribution of the catalyst, and to inhibit the coking reaction of the catalyst; the other is to improve the diffusion and carbon storage capacity

Method used

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  • Catalyst for aromatization and quality modification of catalytic gasoline
  • Catalyst for aromatization and quality modification of catalytic gasoline
  • Catalyst for aromatization and quality modification of catalytic gasoline

Examples

Experimental program
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preparation example Construction

[0010] The preparation method of the catalyst of the present invention comprises the steps of placing HZSM-5 raw powder, aluminum oxide and kale powder in proportion in a container for kneading, extruding, drying, pelletizing, molding and roasting. Use n-hexane as the solvent and 20# silicone oil as the modifier to modify the outer surface of the silicon-coated catalyst. Add it dropwise to the catalyst at a solid-to-liquid volume ratio of 1.2:1. After soaking at room temperature for a period of time, evaporate the n-hexane solvent to dryness at 90°C. Afterwards, bake at 550°C for 4h. The molded catalyst is added with Zn active component by equal volume impregnation method, then dried and calcined.

[0011] Its concrete embodiment is as follows:

example 1

[0013] The synthesis of example one, ZSM-5 molecular sieve

[0014] According to the synthetic method of ZSM-5 molecular sieve as described in claim 4, take by weighing 100 grams of dried diatomite, measure its saturated water absorption. Dissolve the aluminum source, seed crystal directing agent and sodium hydroxide in distilled water under saturated water absorption to prepare a solution, and impregnate 100 grams of diatomaceous earth in saturation. Move the modified diatomaceous earth into a crystallization kettle and crystallize at 170°C for 24 h. After the crystallization is complete, cool to room temperature, repeat washing and filtering until the filtrate is neutral, dry at 100°C, and dry at 550°C. Roasting for 4 hours, the product molecular sieve raw powder was obtained, and the hydrogen ZSM-5 molecular sieve was obtained after ammonium nitrate exchange by the conventional method.

[0015] According to the synthetic method of ZSM-5 molecular sieve as described in clai...

example 2

[0018] Example two, silicon-coated modification of ZSM-5 molecular sieve

[0019] With HZSM-5 raw powder, Al 2 o 3 As a binder, 60 grams of ZSM-5 powder and 40 grams of Al 2 o 3 , A small amount of extrusion aid is placed in the container for kneading, extruding, drying, dicing, molding and roasting. Get the molded carrier for later use. According to the liquid-solid volume ratio of 1.2:1, n-hexane is used as the solvent, the modifier is 20# silicone oil, and the impregnation is static at room temperature for 12 hours. The n-hexane solvent was evaporated to dryness in a water bath at 90°C, and vacuum diffusion dried at 90°C for 4 hours. Blow drying at 150°C for 2 hours, blow drying at 280°C for 2 hours, and blow drying at 550°C for 4 hours. Obtain modified molecular sieve ZSM-5(25)-Al 2 o 3 -Si(0.15) and ZSM-5(25)-Al 2 o 3 -Si(0.25), its structural parameters and physical and chemical properties are as follows:

[0020]

[0021] From the surface area and pore str...

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Abstract

The invention discloses a catalyst for aromatization and quality modification of FCC (fluid catalytic cracking) gasoline. The catalyst is obtained by modifying stepped hole ZSM-5 by solid-phase crystallization of a molecular sieve by taking solid silica gel or kieselguhr as a silicon source. The modification process comprises the following steps: firstly, carrying out surface silicon coating modification on the molecular sieve by adopting silicon oil with certain molecular weight, then depositing a certain amount of metal ions on the inner surface of the molecular sieve by a dipping method, and compounding the modified molecular sieve with the silicon-coated outer surface and metal-deposited inner surface with a certain amount of aluminum oxide and silicon oxide, thereby obtaining the catalyst provided by the invention. Because the adopted molecular sieve has a smooth mesoporous structure, and is subjected to outer-surface silicon coating modification and inner-surface metal modification, the catalyst provided by the invention has the properties of good aromatization performance and high carbon deposit resistant capability, and is especially suitable for production of clean gasoline with high fluid yield in a modification process of the catalytic gasoline.

Description

technical field [0001] The invention relates to an FCC gasoline aromatization reforming catalyst and a preparation method thereof. The method belongs to the technology of catalyzing gasoline aromatization to reduce olefins in the production process of clean oil products. The catalyst adopts a ZSM-5 molecular sieve with a three-dimensional pore structure, a stepped pore structure and a silicon-coated surface as the main active component. Because the molecular sieve used has been modified by silicon coating on the outer surface and metal modification on the inner surface, the catalyst of the present invention has the characteristics of good aromatization performance and high anti-coking ability, and the catalyst is especially suitable for the modification of catalytic gasoline The process produces clean gasoline with high liquid yield. Background technique [0002] The content of olefins in inferior FCC gasoline can be as high as 50-65vol%. Olefins are high-octane components ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/40B01J35/10C10G45/68C10G35/095
Inventor 柳云骐张珂刘晨光于建宁柴永明
Owner BC P INC CHINA NAT PETROLEUM CORP
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