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A kind of preparation method of silicon-containing catalytic cracking catalyst

A catalytic cracking and catalyst technology, used in catalyst activation/preparation, physical/chemical process catalysts, molecular sieve catalysts, etc., can solve problems such as loss of fluidity, poor stability of acidic silica sol, difficult to store, and easy gelation of colloids. B acid strength, conducive to rapid diffusion, and the effect of increasing solid content

Active Publication Date: 2018-12-25
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The technical problem to be solved by the present invention is that the acidic silica sol has poor stability and is not easy to store in the preparation process of the existing catalytic cracking catalyst, and the colloids existing in the alkaline silica sol in the preparation process of the silicon-rich catalytic cracking catalyst tend to gel and lose fluidity At the same time, phosphorus (P) modification is carried out on molecular sieves on the basis of removing fragmented aluminum with organic acid complexing agents, and a silicon-based catalytic cracking catalyst is provided by optimizing both the matrix and the active components. The preparation method of the catalyst has better heavy oil conversion rate, coke selectivity and light oil yield

Method used

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  • A kind of preparation method of silicon-containing catalytic cracking catalyst
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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] In a reaction tank heated by a water bath, add 2.2kg of water, 38.5ml of rare earth (calculated as rare earth oxide, the same below, 272.5g / L), and add 1000g of activated alumina under stirring (calculated as alumina, the same below, Solid content 66% by weight), then slowly add hydrochloric acid to carry out peptization, stir 1h. The initial pH value of sodium-type alkaline silica sol (30% by weight of silica content) is 9.60. Weigh 1500 g of alkaline silica sol, add 15 ml of concentrated hydrochloric acid (concentration: 37% by mass) under stirring conditions, and stir evenly to obtain the pH value 2.5 hydrochloric acid modified alkaline silica sol; 1.24kg of REHY molecular sieve with a solid content of 82% by weight was beaten and dispersed with 1.85kg of water, and 3% oxalic acid relative to the dry basis of molecular sieve and 0.9% of elemental phosphorus were added under stirring conditions % ammonium dihydrogen phosphate, wherein oxalic acid is pre-dissolved in w...

Embodiment 2

[0056] In the reaction tank with water bath heating, add 2.1kg water, 38.5ml rare earth (272.5g / L), add 818g activated alumina (solid content 66% by weight) under stirring, then slowly add hydrochloric acid and carry out peptization, stir After 1 hour, 857 g of aluminum sol (solid content of 21% by weight based on alumina, the same below) was added. The initial pH value of sodium-type alkaline silica sol (silicon dioxide content 30% by weight) is 9.60. Weigh 1500 g of alkaline silica sol, add 14 ml of concentrated hydrochloric acid (concentration 37 mass %) under stirring conditions, and stir evenly to obtain the pH value 2.8 Hydrochloric acid-modified alkaline silica sol; 1.24kg of REHY molecular sieve with a solid content of 82% by weight plus 1.85kg of water for beating and dispersion, adding 3% oxalic acid relative to the dry basis of molecular sieve and 0.9% as elemental phosphorus under stirring conditions % ammonium dihydrogen phosphate, wherein oxalic acid is pre-disso...

Embodiment 3

[0058] In a reaction tank with water bath heating, add 2.1kg water, 38.5ml rare earth (272.5g / L), add 909g active alumina (solid content 66% by weight) under stirring, then slowly add hydrochloric acid to carry out peptization, stir 1 h, then 857 g of aluminum sol (solid content 21% by weight) was added. The initial pH value of sodium-type alkaline silica sol (30% by weight of silica content) is 9.60. Weigh 1500 g of alkaline silica sol, add 11 ml of concentrated hydrochloric acid (concentration: 37% by mass) under stirring conditions, and stir evenly to obtain the pH value 3.3 hydrochloric acid modified alkaline silica sol; 1.24kg of REHY molecular sieve with a solid content of 82% by weight was beaten and dispersed with 1.85kg of water, and 0.9% dihydrogen phosphate was added in terms of elemental phosphorus relative to the dry basis of the molecular sieve under stirring conditions Ammonium and 3% oxalic acid, that is, phosphorus modification. Before oxalic acid dealuminatio...

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Abstract

The invention discloses a preparation method of a silicon group-containing catalytic cracking catalyst. The preparation method comprises mixing and beating an Al-based binder, a modified molecular sieve, clay and silica sol, and carrying out spray drying and roasting to obtain the catalyst. The silica sol is acid-modified alkaline silica sol and under acid modification conditions of stirring and a temperature of 0-30 DEG C, an acid is added into the alkaline silica sol and the mixture is uniformly mixed until sol pH is in a range of 1-5 so that the acid-modified alkaline silica sol is obtained. The modified molecular sieve is obtained through non-framework aluminum removal and phosphorus modification and under modification conditions of stirring and a temperature of 0-30 DEG C, an organic acid complexing agent is added into molecular sieve slurry so that non-framework aluminum is removed and a phosphorous compound is added into the molecular sieve slurry for modification. The preparation method realizes base and active component optimization. The catalyst has the advantages of good heavy oil conversion rate, coke selectivity and light oil yield.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a catalytic cracking catalyst. Background technique [0002] With the increasing difficulty of oil extraction, the trend of heavy crude oil in the world is very obvious. While the quality of crude oil is becoming heavier and worse, the world's demand for light oil products is increasing day by day. Fluid Catalytic Cracking (FCC) is one of the most effective and economical methods to lighten heavy raw materials, so the proportion of raw materials mixed with residual oil in FCC units is increasing day by day. Catalyst coking is a very common phenomenon in catalytic cracking processes. The carbon deposition produced by catalyst coking will not only cover the active center of the catalyst, but also block the pores of the catalyst, making the catalytic reaction unable to continue. If the regeneration performance of the catalyst is poor, the activity of t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08B01J35/10B01J37/28
Inventor 李雪礼高雄厚谭争国张海涛段宏昌潘志爽张忠东李荻蔡进军黄校亮郑云锋刘超伟袁程远
Owner PETROCHINA CO LTD
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