Modified aluminum oxide, preparation method of modified aluminum oxide and catalyst containing modified aluminum oxide

A technology of alumina modification, applied in the field of alumina, which can solve the problems of high coke yield, catalyst performance degradation, catalytic cracking catalyst poisoning and pollution, etc., and achieve high cracking performance, excellent product distribution, and optimized pore structure.

Active Publication Date: 2020-10-09
CHINA PETROLEUM & CHEM CORP +1
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  • Claims
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Problems solved by technology

After the crude oil is inferior, the residual oil contains high impurities such as heavy metals, S, N, and residual carbon, which will cause huge poisoning pollution to the catalytic cracking catalyst, lead to a decline in the performance of the catalyst, and affect the product distribution of the catalytic cracking unit. Refining yields have a big impact
[0004]Traditional FCC catalysts are generally composed of a matrix and a molecular sieve, in which the molecular sieve is the active center of the catalyst. In order to improve the heavy oil conversion ability of the FCC catalyst, the catalyst must have more High reactivity, more macroporous structure and better pore structure distribution, so simply increasing the content of active components cannot fully meet this development requirement, and at the same time, too high active components will lead to excessive coke production in product distribution , affecting the material, heat and benefit balance of the catalytic cracking unit

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  • Modified aluminum oxide, preparation method of modified aluminum oxide and catalyst containing modified aluminum oxide
  • Modified aluminum oxide, preparation method of modified aluminum oxide and catalyst containing modified aluminum oxide
  • Modified aluminum oxide, preparation method of modified aluminum oxide and catalyst containing modified aluminum oxide

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preparation example Construction

[0025] One embodiment of the present invention provides a method for preparing modified alumina, comprising:

[0026] aging the raw material mixture to obtain a first precursor;

[0027] mixing the first precursor with an alkaline earth metal compound to obtain a second precursor; and

[0028] Calcining the second precursor to obtain modified alumina;

[0029] Wherein, the raw material mixture includes a first aluminum source, a second aluminum source, a pore expander and water; the first aluminum source includes Al(OH), for example, the first aluminum source can be boehmite (AlO(OH)); The second aluminum source includes Al(OH) 3 .

[0030] In one embodiment, the molar ratio of the first aluminum source, the second aluminum source, the pore-enlarging agent and water is (1-4):(1-4):(1-4):(10-40), preferably (1~1.5):(1~1.5):(1~1.5):(10~15), such as 1:2:1:10, 2:1:1:10, 1:1:1:10, 1:1:1:15 etc. Wherein, the moles of the first aluminum source and the second aluminum source are...

Embodiment 1

[0094] The gibbsite, gibbsite, citric acid, ammonium bicarbonate, and water were stirred and mixed for 1 hour according to the molar ratio of 1:1:0.5:0.5:10, and the resulting mixture was heated at 130° C. at 1 atm (absolute pressure, under Same), water vapor conditions (the water vapor content in the atmosphere is 100% by volume, the same below) aging for 3 hours, and then drying the obtained solid in an air atmosphere at 120°C to obtain the first precursor A.

[0095] Mix the first precursor A (calculated as alumina) and magnesium chloride solution (calculated as MgO) according to the molar ratio of 1:0.03, stir at 60°C for 1h, then filter, and dry the filter cake at 120°C, and the solid Calcined at 700°C for 3 hours, the modified alumina B with optimized pore structure was finally obtained. The composition analysis and pore distribution results of the first precursor A and modified alumina B are shown in Table 1.

Embodiment 2

[0097] The gibbsite, gibbsite, citric acid, ammonium bicarbonate, and water were stirred and mixed for 1 hour according to the molar ratio of 1:1:0.5:0.5:10. ), water vapor conditions (the water vapor content in the atmosphere is 100% by volume, the same below) aging for 3 hours, and then drying the obtained solid in an air atmosphere at 120° C. to obtain the first precursor A.

[0098] The first precursor A (calculated as alumina) and magnesium chloride solution (calculated as MgO) were mixed according to the molar ratio of 1:0.03, stirred at 60°C for 1h, and then filtered, and the filter cake was dried at 120°C, and the dried The solid was calcined at 500°C for 3 hours to finally obtain modified alumina C with optimized pore structure. The relevant analysis data are shown in Table 1.

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Abstract

The invention provides modified aluminum oxide, a preparation method of the modified aluminum oxide and a catalyst containing the modified aluminum oxide. The preparation method comprises the following steps: carrying out aging treatment on a raw material mixture to obtain a first precursor; carrying out ion exchange on the first precursor and an alkaline earth metal compound to obtain a second precursor; and roasting the second precursor to prepare the modified aluminum oxide, wherein the raw material mixture comprises a first aluminum source, a second aluminum source, a pore-enlarging agentand water; the first aluminum source comprises Al(OH), the second aluminum source comprises Al(OH)3, and the alkaline earth metal in the alkaline earth metal compound is one or more of Be, Mg, Ca, Srand Ba. The modified aluminum oxide provided by one embodiment of the invention has an optimized pore structure, and is used for a catalytic cracking catalyst, so that the catalyst can maintain high cracking performance and excellent product distribution on the basis of low active component molecular sieve content.

Description

technical field [0001] The invention relates to alumina, in particular to a modified alumina with optimized pore structure and its application. Background technique [0002] With the development trend of petroleum resources becoming increasingly heavy and inferior, how to rationally utilize inferior residual oil is a difficult problem faced by the oil refining industry, especially as the catalytic cracking process is the basis of the refining process, how to improve the refining effect of inferior residual oil is the top priority heavy. [0003] In my country, the catalytic cracking unit (FCCU) has always been the most important crude oil secondary processing unit in oil refineries because of its strong adaptability to raw materials, high yield of light oil products, and high octane number of gasoline. At present, catalytic cracking units are responsible for the production of 75% of gasoline, 35% of diesel, propylene, ethylene and other chemicals in China. Therefore, cataly...

Claims

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Application Information

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IPC IPC(8): B01J23/78B01J29/14C10G11/04C10G11/05
CPCB01J23/78B01J29/146C10G11/04C10G11/05C10G2400/02C10G2300/70Y02P20/52
Inventor 张杰潇张万虹李家兴许明德田辉平严加松
Owner CHINA PETROLEUM & CHEM CORP
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