Carbon-deposition-resistant catalytic cracking catalyst and preparation method thereof

A catalytic cracking and catalyst technology, which is applied in the fields of chemical industry and catalytic cracking, can solve the problems of deteriorating product distribution, reducing conversion rate, affecting catalyst activity, etc., to reduce the probability of condensation coking, improve the anti-coking ability, and enhance the bonding effect Effect

Inactive Publication Date: 2015-04-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Carbon deposition not only affects catalyst activity, reduces conversion rate, and deteriorates product distribution, but also is not conducive to maintaining heat balance in the device, interfering with normal production, and greatly affecting economic benefits and product quality

Method used

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  • Carbon-deposition-resistant catalytic cracking catalyst and preparation method thereof
  • Carbon-deposition-resistant catalytic cracking catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This embodiment provides an anti-coking catalytic cracking catalyst, wherein the catalyst is prepared through the following steps:

[0049] 1. Preparation of SAPO-11 molecular sieves with different fluorine contents:

[0050] Al 2 o 3 ,P 2 o 5 , SiO 2 , The molar ratio of di-n-propylamine is 1:1:0.4:1 and mixed with deionized water evenly;

[0051] Under stirring conditions, add hydrofluoric acid, mix evenly, adjust the pH value to 4.5-5.5, and obtain a solution with a pH value of 4.5-5.5;

[0052] The solution with a pH value of 4.5-5.5 was prepared in a water bath at 80°C to prepare dry glue, and the dry glue was dried at 80°C for 45 minutes;

[0053] crystallizing the dried dry glue at 200° C. for 24 hours to obtain a crystallized product;

[0054] The crystallized product was washed with deionized water, dried at 100° C. for 12 hours, and then calcined at 600° C. for 4 hours to obtain a fluorine-containing SAPO-11 molecular sieve.

[0055] The above-mentioned ...

Embodiment 2

[0065] This example provides a comparison of the acidity of the SAPO-11 molecular sieve and the fluorine-containing SAPO-11 molecular sieve (SAPO-0.4) prepared in Example 1, which was tested by the ammonia gas temperature-programmed desorption method.

[0066] The acid content and acid strength of the sample were analyzed by CHEMBET3000TPR / TPD chemical adsorption instrument produced by Quantanchrome Company of the United States. After the sample was treated at 600 ° C for 0.5 h in a He atmosphere, it was cooled to 100 ° C and adsorbed NH 3 , starting from 100°C for 10min after adsorption saturation -1 Program the temperature to 650°C to start the desorption test.

[0067] The test results of the ammonia temperature programmed desorption method are shown in Table 1.

[0068] Table 1

[0069]

[0070] SAPO-0.4: In the process of preparing fluorine-containing SAPO-11 molecular sieve, the amount of hydrofluoric acid added is calculated by HF, HF and Al 2 o 3 The molar ratio...

Embodiment 3

[0076] This example provides the application of the anti-coking catalytic cracking catalyst prepared in Example 1 in the catalytic cracking of n-dodecane.

[0077] The reaction conditions for catalytic cracking of n-dodecane are:

[0078]

[0079] The product distribution of above-mentioned n-dodecane catalytic cracking reaction is as shown in table 2:

[0080] Table 2

[0081] catalyst

Y / SAPO-0

Y / SAPO-0.2

Y / SAPO-0.4

Y / SAPO-0.6

Y / SAPO-0.8

Hydrogen / %

0.01

0.01

0.01

0.01

0.01

Dry gas / %

0.46

0.38

0.33

0.34

0.29

LPG / %

24.05

21.07

20.17

19.76

19.38

i-C 5-12 / %

9.27

8.89

11.88

10.13

7.38

C 5-12 ＝ Olefin / %

6.54

6.53

7.09

6.42

6.05

Aromatics / %

1.59

0.93

1.83

1.04

0.88

Naphthenic / %

0.24

0.26

0.37

0.25

0.23

Coke / %

0.36

0

0

0

0

i-...

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Abstract

The invention provides a carbon-deposition-resistant catalytic cracking catalyst and a preparation method thereof. The method comprises the following steps: adding kaolin into deionized water, and stirring to uniformly disperse kaolin, so as to obtain an aqueous solution of kaolin; adding USY type molecular sieve, adding aluminium sol, stirring to uniformly mix USY type molecular sieve and aluminium sol, adding fluorine-containing SAPO-11 molecular sieve, and stirring to uniformly mix the materials; adding pseudo-boehmite, and dropwise adding hydrochloric acid for acidifying, so as to obtain a sol of the carbon-deposition-resistant catalytic cracking catalyst; baking to evaporate water, and then performing roasting, so as to obtain a fresh agent of the carbon-deposition-resistant catalytic cracking catalyst; and performing hydrothermal ageing processing, so as to obtain the carbon-deposition-resistant catalytic cracking catalyst. The catalyst preparation technology is simple and easy for industrial operation, the catalyst is high in catalytic activity and substantial in carbon deposition resistance, and during catalytic cracking, the catalyst is capable of improving conversion rate, reducing dry-gas yield and reducing coke selectivity, thereby optimizing product distribution.

Description

technical field [0001] The invention provides an anti-coking catalytic cracking catalyst and a preparation method thereof, which relate to the technical field of chemical engineering, in particular to the technical field of catalytic cracking. Background technique [0002] As crude oil becomes heavier and worse, the catalytic cracking unit (FCC Unit), as an important means of lightening heavy oil, plays an increasingly irreplaceable role in petroleum refining. Raw material colloids, asphaltenes, and high residual carbon content will aggravate the side reactions of carbon deposition in the cracking process. Carbon deposition not only affects catalyst activity, reduces conversion rate, and deteriorates product distribution, but also is not conducive to maintaining heat balance in the device, interferes with normal production, and greatly affects economic benefits and product quality. The cracking reaction follows the carbanion mechanism, with the acid center as the catalytic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/85C10G11/05
Inventor 刘欣梅刘毓翔崔晓
Owner PETROCHINA CO LTD
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