Preparation method of magnesium salt precipitation modified Y-type molecular sieve

A molecular sieve and magnesium salt technology, applied in molecular sieve catalysts, chemical instruments and methods, petroleum industry, etc., can solve problems such as loss of magnesium ions, and achieve the effects of improving cracking activity, improving activity stability, and improving pollution performance.

Inactive Publication Date: 2019-09-03
PETROCHINA CO LTD
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Problems solved by technology

[0009] The purpose of the present invention is to provide a preparation method of magnesium salt precipitation modified Y-type molecular sieve to solve the defect that magnesium ion loss is easily caused in the prior art molecular sieve magnesium ion modification process

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  • Preparation method of magnesium salt precipitation modified Y-type molecular sieve
  • Preparation method of magnesium salt precipitation modified Y-type molecular sieve
  • Preparation method of magnesium salt precipitation modified Y-type molecular sieve

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preparation example Construction

[0036] The preparation method of the molecular sieve suggested in the present invention is preferably "one-cross-baking" ultra-stable rare earth sodium Y molecular sieve, and the "one-cross-baking" ultra-stable rare earth sodium Y molecular sieve is obtained through second precipitation and second roasting Ultra-stable rare earth Y-type molecular sieve.

[0037] The second precipitation modification and the second roasting in the present invention can be carried out by firstly modifying the "one-to-one-baking" rare earth / ammonium salt reducing sodium Y molecular sieve through ammonium salt exchange and reducing sodium, and then performing or not filtering and washing with water , followed by magnesium salt precipitation modification and second calcination, or the “cross-roasting” rare earth sodium Y molecular sieve undergoes ammonium salt exchange and magnesium salt precipitation modification. After that, filter, wash with water and roast for the second time, so as to obtain t...

Embodiment 1

[0072] In a reaction kettle with a heating jacket, add 3000g NaY-1 molecular sieve (dry basis) and a certain amount of deionized water successively to form a slurry with a solid content of 220g / L, add 82g boric acid and 105g scallop powder, and then heat up to 85°C, exchange and react for 0.5 hours under stirring, then filter and wash, put the obtained filter cake in a reaction kettle, and then add 1.67 liters of rare earth chloride to adjust the pH of the system to 4.0, raise the temperature to 80°C, and exchange for 0.3 hour, the resulting filter cake was flash-dried to make the water content 30% to 50%, and finally roasted at 70% water vapor and 670°C for 1.0 hour to obtain "cross-baked" rare earth sodium Y. In a reaction kettle with a heating jacket, add 500 g (dry basis) of "cross-baking" ultra-stable rare earth sodium Y molecular sieve and a certain amount of deionized water to make a slurry with a solid content of 120 g / L, and add 120 g of sulfuric acid Ammonium, adjust...

Embodiment 2

[0075] In the reaction kettle with heating jacket, add 3000gNaY-1 molecular sieve (dry basis) and a certain amount of deionized water successively to prepare a slurry with a solid content of 360g / L, add 0.82 liters of rare earth nitrate, and adjust the system pH= 3.3, heat up to 80°C, exchange reaction for 1.5 hours, then filter and wash, put the obtained filter cake in the reaction kettle, add 202g polyacrylamide and 30g salicylic acid, then heat up to 78°C for dispersion exchange, and stir Under the exchange reaction for 0.5 hours, the resulting filter cake was flash-dried to make the moisture content 30% to 50%, and finally roasted at 30% water vapor and 630°C for 1.8 hours to obtain "one-cross-roasted" rare earth sodium Y. In a reactor with a heating jacket, add 500 g (dry basis) and deionized water of "cross-baking" ultra-stable rare earth sodium Y molecular sieve to make a slurry with a solid content of 370 g / L, add 200 g of ammonium sulfate, adjust System pH = 3.6, heat...

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Abstract

The invention relates to a preparation method of a magnesium salt precipitation modified Y-type molecular sieve. NaY zeolite (the silicon-aluminum ratio is more than 4.0 and the crystallinity is morethan 75%) is taken as a raw material, and rare earth exchange, dispersion exchange and first roasting are carried out to obtain a ''once exchange and once roasting'' rare earth- NaY molecular sieve; the ''once exchange and once roasting'' rare earth- NaY molecular sieve is subjected to exchange sodium reduction modification, magnesium salt precipitation modification, and second roasting treatmentto obtain the magnesium salt precipitation modified Y-type molecular sieve, wherein the magnesium salt precipitation modification can be carried out before the second roasting, after the second roasting, or simultaneously before and after the second roasting, and the sequence is not particularly limited. A cracking catalyst prepared by adopting the molecular sieve can control the proportion of different reactions in the cracking process, reduces further cracking of light oil and improves the yield of the light oil.

Description

technical field [0001] The invention relates to a magnesium salt precipitation-modified Y-type molecular sieve and a preparation method thereof, more specifically to a Y-type molecular sieve that improves the anti-heavy metal pollution ability and the preparation method thereof, especially the anti-vanadium pollution ability. Background technique [0002] The continuous rise of crude oil prices has greatly increased the processing costs of refineries. At present, catalytic cracking is an important means of heavy oil processing in refineries. In order to reduce costs and maximize benefits, heavy oil can be processed through deep processing and low-quality oil. to realise. [0003] However, low-quality crude oils are generally higher in heavy metals such as vanadium. The vanadium-containing compounds in petroleum are a kind of special metal complexes, which generally exist in the form of porphyrin vanadium and non-porphyrin vanadium. The boiling point of metalloporphyrin is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J29/08C10G11/05
CPCB01J29/088B01J2229/18C10G11/05C10G2300/1077
Inventor 柳召永赵连鸿张忠东刘涛王辰晨刘明霞翟佳宁曹庚振孙雪芹曹兰花孙艳波苏怡
Owner PETROCHINA CO LTD
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