Prepn process of REY molecular sieve

A molecular sieve and aluminum ion technology, applied in the field of preparation of REY molecular sieve, can solve the problems of small unit cell constant and low activity, and achieve good hydrothermal stability and good cracking reaction activity.

Active Publication Date: 2007-12-19
CHINA PETROLEUM & CHEM CORP +1
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AI Technical Summary

Problems solved by technology

[0018] Although the rare earths precipitated by the above patents have improved the utilization rate of rare earths, the unit cell constant and activity are low after molecular sieve ultra-stable treatment.

Method used

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Examples

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Comparison scheme
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preparation example Construction

[0022] The preparation method of REY molecular sieve provided by the invention more specifically comprises the following steps:

[0023] (1) Contact NaY molecular sieve with a silicon-aluminum ratio ≥ 4.5 with an aqueous solution containing rare earth ions or with an aqueous solution containing rare earth ions and an aqueous solution containing aluminum ions, wherein, in terms of rare earth oxides, the ratio of rare earth ions to molecular sieve solids is preferred 0.12-0.30, more preferably 0.13-0.20, based on alumina, the ratio of aluminum ions to molecular sieve solids is 0-0.1, preferably 0-0.05, the liquid-solid ratio is 4-20, preferably 8-15, and the reaction temperature is 60- 95°C, the reaction time is 10-120min, and a precipitant is added to the reaction slurry. When the precipitant is a soluble carbonate aqueous solution, the ratio of the precipitant to the rare earth oxide is more preferably 0.1-1.5 in terms of carbonate. 0.3-0.7; when the precipitating agent is an ...

Embodiment 1

[0038] Get 1000 grams of NaY molecular sieves (dry basis weight, produced by Qilu Catalyst Factory, the same below), and after beating with 8 liters of deionized water, add a concentration of 231g / l (in RE 2 o 3 meter) mixed RECl 3 Solution (Qilu Catalyst Factory provides, wherein La 2 o 3 52.5% by weight, CeO 2 Accounting for 46.5% by weight, Pr 2 o 5 0.6% by weight, Nd 2 o 3 Accounting for 0.4% by weight, hereinafter the same) 706 milliliters, exchanged 0.5 hour at 80 ℃, then added 100 grams of ammonium bicarbonate (chemically pure, produced by Tianjin Nankai Chemical Factory, hereinafter the same), stirred at constant temperature for 0.5 hour, filtered and rinsed, and then The filter cake was calcined at 650° C. in a 100% water vapor atmosphere for 2 hours to obtain a molecular sieve dry powder. Take 1000 grams of this molecular sieve dry powder (dry basis weight), beat with 8 liters of deionized water, add 1000 grams of ammonium chloride (chemically pure, produced ...

Embodiment 2

[0040] Get 1000 grams of NaY molecular sieves, after beating with 10 liters of deionized water, add concentration is 231g / l (in RE 2 o 3 Count) RECl 3 620 milliliters of solutions, then add aluminum sol (production of Qilu Catalyst Factory, Al 2 o 3 Accounting for 22%) 240 grams, exchanged at 90 ° C for 1 hour, then added 75 grams of ammonium bicarbonate, stirred at a constant temperature for 0.3 hours, filtered and rinsed, then roasted the filter cake at 620 ° C, 100% water vapor atmosphere for 2 hours, Obtain molecular sieve dry powder. Take 1000 grams of this molecular sieve dry powder (dry basis weight), beat it with 10 liters of deionized water, add 500 grams of ammonium sulfate (analytical pure, produced by Beijing Yili Fine Chemicals Co., Ltd., the same below), and exchange at 70 ° C for 1.5 hours , filter and rinse, and dry the filter cake to obtain the molecular sieve of the present invention, denoted as V-2. The physical data are shown in Table 1.

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Abstract

The present invention discloses preparation process of REY molecular sieve, and features that REY molecular sieve is made to contact first with RE ion containing water solution or contact with RE ion containing water solution and Al ion containing solution or colloid, then with precipitant to precipitate partial RE onto the molecular sieve, and finally with ammonium salt aqua after being hydrothermal treated. The precipitant is water solution of soluble carbonate or alkaline water solution.

Description

technical field [0001] The invention relates to a preparation method of molecular sieve, more specifically, a preparation method of REY type molecular sieve used as an active component of hydrocarbon catalytic cracking catalyst. Background technique [0002] Catalytic cracking process is an important process of lightening heavy oil, and it is one of the main sources of economic benefits of each refinery. Due to limited resources, the feedstock for catalytic cracking has changed from traditional vacuum distillate oil to blended residue or pure residue feed. Residual oil not only contains macromolecular compounds such as colloid and asphaltene that are prone to coke, but also contains more heavy metals (such as nickel, vanadium, etc.). In the cracking reaction, metals such as nickel and vanadium are deposited on the catalyst, resulting in a decrease in catalyst activity, especially vanadium. Vanadium in a high oxidation state has strong mobility in a high-temperature hydrothe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08
Inventor 李明罡何鸣元罗一斌舒兴田阎荣国
Owner CHINA PETROLEUM & CHEM CORP
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