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Catalyst for straight-run naphtha aromatization and preparation method thereof

A catalyst and an aromatization technology are applied in the field of a catalyst for the aromatization of straight-run naphtha and the field of preparation thereof, which can solve the problems of poor stability of the aromatization catalyst, and achieve the advantages of being beneficial to diffusion and catalysis, uniform distribution, The effect of improving utilization

Inactive Publication Date: 2017-04-05
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] CN201210324511.X provides a low-carbon hydrocarbon aromatization catalyst, which mainly solves the problem of poor stability of existing aromatization catalysts

Method used

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  • Catalyst for straight-run naphtha aromatization and preparation method thereof
  • Catalyst for straight-run naphtha aromatization and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The preparation process of the catalyst used for straight-run naphtha aromatization is:

[0028] (1) Knead ZSM-5 molecular sieve raw powder and silica gel powder according to the mass ratio of 9:1, safflower powder is 1% of the mass number of molecular sieve and silica gel powder, peptize with silica sol, extrude and dry at 120°C Carrier A was prepared by calcining for 2 hours at a constant temperature of 550° C. for 4 hours.

[0029] (2) Get 30 grams of molecular sieve A and put it into the constant temperature section of the fixed-bed reactor, raise the temperature to 500°C at a rate of 5°C / min, and after the temperature is constant, use a metering pump to feed ammonia water (the concentration of ammonia water is 0.2mol / L, 0.3ml / min) was treated for 3 hours, and the molecular sieve number after the treatment was B.

[0030] (3) Take 20 grams of molecular sieve B and place it in a 500-milliliter beaker, add 200 milliliters of 10% sodium hydroxide aqueous solution, an...

Embodiment 2

[0034] The ammonia water in step (2) was replaced with deionized water, and the rest of the preparation process was the same as in Example 1 to obtain aromatization catalyst b.

Embodiment 3

[0036] Add 500 ml of ammonium nitrate with a mass fraction of 10% and a mixed solution of lanthanum nitrate with a mass fraction of 10% in step (4), heat up to 90°C under stirring, reflux at a constant temperature for 2 hours, filter, wash, and dry at 120°C After 2 hours, put it into a muffle furnace and heat it up to 550° C., and bake it for 4 hours. Repeat the above operation twice to obtain a molecular sieve, coded as D.

[0037] In step (5), the molecular sieve D is impregnated with zinc nitrate solution for 12 hours, dried at 120° C. for 4 hours, and calcined at 550° C. for 12 hours. The rest of the preparation process is the same as that of Example 1 to obtain aromatization catalyst c.

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Abstract

The invention discloses a catalyst for straight-run naphtha aromatization and a preparation method thereof. The catalyst for straight-run naphtha aromatization is prepared by modifying a nano ZSM-5 molecular sieve, preparing a carrier and preparing the catalyst. The catalyst is suitable for treating raw materials with high alkane content. And the catalyst has high catalytic activity and high arene selectivity. So the catalyst can be applied to more mild process conditions and can be applied to production of high-octane gasoline blending components and chemical raw materials like benzene, toluene, xylene, etc.

Description

technical field [0001] The patent of the invention relates to the field of petrochemical industry, in particular to a catalyst for aromatization of straight-run naphtha and a preparation method thereof. Background technique [0002] With the decreasing of petroleum resources, the research of converting abundant straight-chain low-carbon alkanes into high value-added benzene, toluene and xylene (BTX) has attracted people's attention. BTX can be used as a blending component of high-octane gasoline, and is an important raw material in the organic chemical industry, especially p-xylene has attracted the most attention as a raw material for the production of polyester. Aromatization of light hydrocarbons is a new technology developed in recent years to use light hydrocarbons to produce aromatics or high-octane gasoline blending components. This technology has the following characteristics: the molecular sieve catalyst used has a certain resistance to sulfur and nitrogen. No pre-...

Claims

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Application Information

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IPC IPC(8): B01J29/40
Inventor 曹志涛程光剑莫娅南李学赵晶王永帮孙伟刚张英杰张黎英李振忠王俊艳石洪波
Owner PETROCHINA CO LTD
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