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A preparation method of catalytic cracking light gasoline aromatization catalyst

A catalytic cracking and catalyst technology, which is applied in the preparation of zeolite-containing aromatization catalysts and catalytic cracking light gasoline aromatization catalysts. Uniformity, high aromatics selectivity, effect of increasing octane number

Inactive Publication Date: 2018-02-16
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The aromatization catalysts in the above-mentioned patents use modified ZSM-5 molecular sieves with different properties. This is because the modification methods are different, thus resulting in differences in catalyst performance.
However, the above-mentioned catalysts have the disadvantages of fast coking, short operation period, low selectivity of aromatics, and many by-products.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0033] The present invention is a method for preparing catalytic cracking light gasoline aromatization catalyst. The modified nano-HZSM-5 zeolite molecular sieve catalyst is obtained by modifying the nano-ZSM-5 zeolite molecular sieve. The method is characterized in that the steps of the method are as follows:

[0034] (1) Use ammonium salt solution to ion-exchange sodium ZSM-5 zeolite for 3 times, dry and roast; then use inorganic acid or organic acid to pickle the molecular sieve, wash with water to neutrality, repeat the drying and roasting steps to obtain Nano HZSM-5 zeolite molecular sieve;

[0035] (2) High temperature steam treatment of nano HZSM-5 zeolite molecular sieve: In a fixed bed reactor, use a metering pump to pass water or 0.1-0.5mol / LNH 3 -H 2 O high-temperature hydrothermal treatment of nano-HZSM-5 zeolite molecular sieve;

[0036] (3) Add the above-mentioned nano-HZSM-5 zeolite molecular sieve to one or two mixed solutions of rare earth or metal cobalt, molybdenum...

Embodiment 1

[0047] The preparation process of a modified molecular sieve is:

[0048] (1) Take 30g of NaZSM-5 molecular sieve and place it in a 500mL beaker, add 200mL of 10% ammonium nitrate solution, under stirring, heat up to 90℃, reflux at constant temperature for 2h, filter, wash, and dry at 120℃ for 2h , Then put it into a muffle furnace to program the temperature to 550°C, roast for 4 hours, repeat the above operation twice, modify the molecular sieve product, numbered A.

[0049] (2) Take 20 grams of molecular sieve A and put it into the constant temperature section of the fixed bed reactor, and heat up to 500°C at a rate of 5°C / min. After the temperature is constant, use a metering pump to pass water (0.1mL / min) for 3 hours. The following molecular sieve is numbered B.

[0050] (3) Take 20g of B molecular sieve and place it in a 500mL beaker, add 200ml of 0.6mol / L nitric acid and 0.2mol / L citric acid mixed solution, under stirring, heat up to 80℃, keep the temperature for 6 hours, the ...

Embodiment 2

[0053] Change the water in step (2) to 0.1mol / L NH 3 -H 2 O, the rest of the preparation process is the same as in Example 1.

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Abstract

The invention belongs to the technical field of petroleum processing, and relates to a method for preparing a catalytic cracking light gasoline aromatization catalyst; the preparation method of the catalyst mainly includes modification of nano ZSM-5 molecular sieves, preparation of a carrier, preparation of a catalyst, etc., and the prepared catalyst It can minimize the low-carbon olefins in catalytic cracking light gasoline and ensure that the octane number does not decrease or even increase. The present invention comprehensively considers the characteristics of reducing the content of low-carbon olefins to produce aromatization catalysts rich in aromatics, the activity, selectivity and stability of the prepared catalyst are well distributed, the experimental operation is simple, and the process can be changed in a wide range condition.

Description

Technical field [0001] The invention belongs to the technical field of petroleum processing, and mainly relates to a preparation method of a catalytic cracking light gasoline aromatization catalyst, in particular to a preparation method of a zeolite-containing aromatization catalyst. Background technique [0002] In recent years, as environmental protection requirements have become increasingly strict, countries around the world have successively promulgated new gasoline standards, and my country is no exception. However, the composition of gasoline in my country is characterized by high olefin content and low octane number. Therefore, reducing the olefin content in gasoline and ensuring that the original octane number of gasoline does not decrease is an urgent problem in my country. As C in my country’s FCC gasoline 6 -C 10 The content of olefins and alkanes is relatively high. These olefins and alkanes are latent aromatic substances and can be used to produce aromatics. At pre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/46B01J29/48B01J29/40
Inventor 朱静于大伟徐铁军杨旭鹏孙明珠
Owner SHENYANG POLYTECHNIC UNIV
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