CN1911513A - Ammonium ion exchange method of NaY molecular sieve - Google Patents
Ammonium ion exchange method of NaY molecular sieve Download PDFInfo
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Abstract
The ammonium ion exchange process for NaY molecular sieve includes pulping NaY molecular sieve, inorganic salt and H2O in the weight ratio of 1 to (0.5-2.0) to (5-30) to form slurry, regulating pH value of the slurry with alkaline solution to 9.0-12.0, exchange at 60-95 deg.c for 0.5-2.0 hr, filtering, washing the filter cake with deionized water and stoving. The ammonium ion exchange process has no repeated change in acid and alkaline condition and can reach sodium content lowered to below 5 wt% in molecular sieve after once ammonium ion exchange.
Description
Technical field
The invention relates to a kind of post-processing approach of NaY molecular sieve, the ammonium ion exchange method of a kind of NaY molecular sieve of more specifically saying so.
Background technology
Molecular sieve has special shape selective catalysis performance in the duct of composition, regular structure, adjustable surface acidity and molecular size uniformly because of it, has obtained using widely at petrochemical industry.Artificial synthetic molecular sieve generally contains sodium, sodium exists with non-skeleton cation form, the negative electrical charge on the framework of molecular sieve that neutralized, but sodium type molecular sieve does not have acidity, after making it change Hydrogen or polyvalent metal type molecular sieve into the method for ion-exchange, just can have acidity.
Concerning the carbonium ion reaction, the sodium content in the molecular sieve is an important parameter, the too high acidity that can reduce molecular sieve of sodium content, the stability of activity, selectivity and the crystal structure of reduction molecular sieve catalyst.Too high sodium content is unfavorable for the molecular sieve dealuminzation, and the super stabilizing of molecular sieve is had adverse effect.Y zeolite can improve its structural stability after fully taking off sodium, improve surface acidity, and then improves activity, selectivity and the reaction speed of molecular sieve catalyst.
In the present molecular sieve preparation process, the modal method that removes sodium ion is: utilize ammonium salt or earth solution to carry out ion-exchange, the pH value of exchange solution is less than 7.0.As Chinese patent CN1210034A, among the CN1065844A, the ammonium ion exchange method by routine takes off sodium, Jiao Huan result once, Na
2O content can drop to 5.0 heavy %, and conventional NaY molecular sieve ammonium ion exchange method is: according to NaY: inorganic ammonium salt: H
2O=1: (0.5～2.0): the weight ratio of (5～30) is mixed making beating evenly, regulates slurry pH value 2～7, and exchange is 0.5～2 hour under 65～95 ℃.Generally repeatedly exchange with fresh solution, the method for roasting in the middle of also can taking promotes Na in the molecular sieve
+Remove fully.
The problem that present molecular sieve takes off the existence of sodium technology is: the preparation building-up process of NaY molecular sieve is in alkaline medium, NaY slurries after washing also are alkalescent (slurry pH value is 9.0～11.0), also can thoroughly not retain salts substances such as a small amount of sodium metasilicate because of washing, the inorganic ammonium compounds aqueous solution that uses in the conventional ammonium ion exchange method since wherein the hydrolysis of ammonium ion make solution be faintly acid, a spot of sodium metasilicate impurity is met the acid back and is produced silica gel in the molecular sieve, quality and subsequent technique to molecular sieve have a negative impact, conventional in addition ammonium ion exchange method need be regulated the Acidity of Aikalinity of environment, complicated operation repeatedly.
Summary of the invention
The purpose of this invention is to provide a kind of better simply ammonium ion exchange method, this method can be avoided the variation repeatedly of Acidity of Aikalinity in molecular sieve preparation, the post processing environment.
The ammonium ion exchange method of NaY molecular sieve provided by the present invention comprises: according to NaY: inorganic ammonium salt: H
2O=1: (0.5～2.0): the weight ratio of (5～30) is even with NaY molecular sieve and the making beating of inorganic ammonium salt water, the pH that regulates slurries with alkaline solution is 9.0～12.0, preferred 9.0～11.0, and be to exchange 0.5～2.0 hour under 60～95 ℃ the condition in temperature, the exchange disposed slurry filters, filter cake deionized water drip washing, oven dry.
In the method provided by the invention, described ammonium salt is selected from ammonium sulfate, ammonium chloride, ammonium nitrate, ammonium acetate and the ammonium phosphate one or several mixture, wherein preferably sulfuric acid ammonium, ammonium chloride or ammonium nitrate.
In the method provided by the invention, the described alkaline solution that is used for regulating slurry pH value is ammonia spirit or organic ammonium compound water solution, and the concentration of used ammonia spirit is generally 16～19 heavy %.
In the method provided by the invention, described organic ammonium compound is selected from TMAH, tetraethyl ammonium hydroxide, TPAOH, the TBAH one or more mixture.
When using alkaline solution to regulate the pH value of exchange solution, the ammonium type molecular sieve that obtains after the ammonium ion exchange has higher degree of crystallinity; When using the tetraethyl ammonium hydroxide aqueous solution to regulate slurry pH value, obtain ammonium type molecular sieve after the ammonium ion exchange and have higher degree of crystallinity, the therefore preferred tetraethyl ammonium hydroxide aqueous solution.
Adopt method provided by the invention, do not need the pH value of molecular sieve synthetic environment is adjusted to acidity by alkalescence, adopt simpler method to make Na in the Y zeolite
2O content drops to below the 5 heavy %; Avoided simultaneously producing silica gel impurity in the molecular sieve, improved the quality of molecular sieve.Become H type molecular sieve after the roasting of prepared ammonium type molecular sieve, perhaps further again modification prepares super-stable Y molecular sieves (USY), can be directly used in the preparation catalytic cracking catalyst.
The specific embodiment
The following examples will the present invention is described further.
In each Comparative Examples and embodiment, the lattice constant of molecular sieve, relative crystallinity adopt the RIPP145-90 standard method (to see volumes such as " petrochemical industry analytical method " (RIPP test method) Yang Cuiding by x-ray powder diffraction (XRD), Science Press, nineteen ninety publishes) measure; Na
2O content is by x-ray fluorescence spectrometry.Used chemical reagent does not indicate especially among Comparative Examples and the embodiment, and its specification is a chemical pure.
The used NaY molecular sieve raw material of Comparative Examples and embodiment is Chang Ling catalyst plant production, Na
2O content is that 13.7 heavy %, lattice constant are that 2.466nm, relative crystallinity are 87.0%.
Comparative Examples
According to the conventional ammonium ion exchange method of NaY molecular sieve among the Chinese patent CN1210034A, with NaY molecular sieve and ammonium chloride and water according to NaY: NH
4Cl: H
2O=1: 1: 20 butt weight ratio making beating mixes, the pH value of regulating slurries with watery hydrochloric acid is 3.0, is warming up to 90 ℃ and stirred 1 hour, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain conventional one molecular sieve of handing over, be designated as A.Its performance sees Table 1.
Embodiment 1
With NaY molecular sieve and ammonium chloride and water according to NaY: NH
4Cl: H
2O=1: 1: 20 butt weight ratio making beating mixes, the pH value of regulating slurries with ammoniacal liquor is 9.0, is warming up to 90 ℃ and stirred 1 hour, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-1.Its performance sees Table 1.
Embodiment 2
With NaY molecular sieve and ammonium phosphate and water according to NaY: (NH
4)
3PO
4: H
2O=1: 1: 15 butt weight ratio making beating mixes, the pH value of regulating slurries with ammoniacal liquor is 10.0, is warming up to 90 ℃ and stirred 0.5 hour, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-2.Its performance sees Table 1.
Embodiment 3
With NaY molecular sieve and ammonium nitrate and water according to NaY: NH
4NO
3: H
2O=1: 1.5: 20 butt weight ratio making beating mixes, the pH value of regulating slurries with ammoniacal liquor is 11.0, is warming up to 90 ℃ and stirred 1 hour, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-3.Its performance sees Table 1.
Embodiment 4
With NaY molecular sieve and ammonium sulfate and water according to NaY: (NH
4)
2SO
4: H
2O=1: 1.5: 25 butt weight ratio making beating mixes, the pH value of regulating slurries with ammoniacal liquor is 12.0, is warming up to 90 ℃ and stirred 1.5 hours, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-4.Its performance sees Table 1.
Embodiment 5
With NaY molecular sieve and ammonium chloride and water according to NaY: NH
4Cl: H
2O=1: 1: 20 butt weight ratio making beating mixes, the pH value of regulating slurries with tetramethyl ammonium hydroxide solution is 9.0, is warming up to 90 ℃ and stirred 1 hour, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-5.Its performance sees Table 1.
Embodiment 6
With NaY molecular sieve and ammonium phosphate and water according to NaY: (NH
4)
3PO
4: H
2O=1: 1: 15 butt weight ratio making beating mixes, the pH value of regulating slurries with tetramethyl ammonium hydroxide solution is 10.0, is warming up to 90 ℃ and stirred 1.5 hours, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-6.Its performance sees Table 1.
Embodiment 7
With NaY molecular sieve and ammonium nitrate and water according to NaY: NH
4NO
3: H
2O=1: 1.5: 20 butt weight ratio making beating mixes, the pH value of regulating slurries with tetramethyl ammonium hydroxide solution is 11.0, is warming up to 90 ℃ and stirred 1 hour, and filtration then, filter cake are with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-7.Its performance sees Table 1.
Embodiment 8
With NaY molecular sieve and ammonium sulfate and water according to NaY: (NH
4)
2SO
4: H
2O=1: 1.5: 25 butt weight ratio making beating mixes, the pH value of regulating slurries with tetramethyl ammonium hydroxide solution is 12.0, be warming up to 90 ℃ and stirred 1.5 hours, filter then, filter cake is with 10 times of deionized water drip washing, oven dry to NaY butt weight, obtain sample of the present invention, be designated as B-8.Its performance sees Table 1.
Table 1
| Sample number into spectrum | Na 2O content (heavy %) | Lattice constant (nm) | Relative crystallinity (%) | The pH value |
| A | 4.5 | 2.466 | 87.0 | 3.0 |
| B-1 | 4.5 | 2.466 | 87.0 | 9.0 |
| B-2 | 4.5 | 2.466 | 87.0 | 10.0 |
| B-3 | 4.5 | 2.466 | 87.5 | 11.0 |
| B-4 | 4.6 | 2.466 | 88.3 | 12.0 |
| B-5 | 4.5 | 2.466 | 89.6 | 9.0 |
| B-6 | 4.5 | 2.466 | 91.3 | 10.0 |
| B-7 | 4.6 | 2.466 | 91.3 | 11.0 |
| B-8 | 4.7 | 2.467 | 92.2 | 12.0 |
Claims (7)
1. the ammonium ion exchange method of a NaY molecular sieve is characterized in that this method comprises: according to NaY: inorganic ammonium salt: H
2O=1: (0.5～2.0): the weight ratio of (5～30) is even with NaY molecular sieve and the making beating of inorganic ammonium salt water, the pH value of regulating slurries with alkaline solution is 9.0～12.0, and be to exchange 0.5～2.0 hour under 60～95 ℃ the condition in temperature, the exchange disposed slurry filters, filter cake deionized water drip washing, oven dry.
2. according to the method for claim 1, it is characterized in that described inorganic ammonium salt is selected from ammonium sulfate, ammonium chloride, ammonium nitrate, ammonium acetate and the ammonium phosphate one or several mixture.
3. according to the method for claim 2, it is characterized in that described ammonium salt is ammonium sulfate, ammonium chloride or ammonium nitrate.
4. according to the method for claim 1, it is characterized in that described alkaline solution is an ammonia spirit.
5. according to the method for claim 1, it is characterized in that described alkaline solution is the organic ammonium compound water solution, the organic ammonium compound is selected from TMAH, tetraethyl ammonium hydroxide, TPAOH, the TBAH one or more mixture.
6. according to the method for claim 5, it is characterized in that described alkaline solution is the tetraethyl ammonium hydroxide aqueous solution.
7. according to the method for claim 1, the pH value that it is characterized in that regulating slurries is 9.0～11.0.
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Cited By (8)
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| CN103691491A (en) * | 2013-12-31 | 2014-04-02 | 中国天辰工程有限公司 | Method for removing sodium by silicon-aluminum-phosphor molecular sieve catalyst |
| CN103964463A (en) * | 2013-01-30 | 2014-08-06 | 中国石油天然气股份有限公司 | Preparation method of Y-type molecular sieve |
| CN104261426A (en) * | 2014-10-08 | 2015-01-07 | 山东齐鲁华信高科有限公司 | Preparation method for low-sodium high-silicon Y type molecular sieve |
| WO2016023523A1 (en) * | 2014-08-15 | 2016-02-18 | 中国石油天然气集团公司 | Y-shaped zeolite having in-crystal multi-level pores, method for preparation of said zeolite, and use thereof |
| CN111573689A (en) * | 2020-07-09 | 2020-08-25 | 山西腾茂科技有限公司 | USY molecular sieve and preparation method thereof |
| CN112209402A (en) * | 2019-07-12 | 2021-01-12 | 中国石油化工股份有限公司 | Ion exchange method for alkali metal-containing molecular sieve |
| CN112516957A (en) * | 2019-11-26 | 2021-03-19 | 上海朗彤环境科技发展有限公司 | Adsorbent and preparation method thereof, chlorine dioxide solid preparation and preparation method thereof |
| CN112897550A (en) * | 2021-04-06 | 2021-06-04 | 山西腾茂科技股份有限公司 | Metal modified Y-type molecular sieve and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1065844A (en) * | 1991-04-18 | 1992-11-04 | 中国石油化工总公司石油化工科学研究院 | The preparation method of superstable Y type zeolite containing less rare-earth elements |
| CN1069552C (en) * | 1997-08-29 | 2001-08-15 | 中国石油化工总公司 | Preparation of super-stable Y molecular sieves |
| CN1195676C (en) * | 2001-10-30 | 2005-04-06 | 中国石油化工股份有限公司 | Molecular sieve ammonium ion exchange process |
| CN1176019C (en) * | 2002-03-29 | 2004-11-17 | 中国石油化工股份有限公司 | Ammonium ion exchange method of molecular sieve |
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2005
- 2005-08-09 CN CNB2005100898468A patent/CN100404134C/en active Active
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| CN103964463B (en) * | 2013-01-30 | 2016-11-23 | 中国石油天然气股份有限公司 | A kind of preparation method of Y type molecular sieve |
| CN103964463A (en) * | 2013-01-30 | 2014-08-06 | 中国石油天然气股份有限公司 | Preparation method of Y-type molecular sieve |
| CN103691491B (en) * | 2013-12-31 | 2015-07-22 | 中国天辰工程有限公司 | Method for removing sodium by silicon-aluminum-phosphor molecular sieve catalyst |
| CN103691491A (en) * | 2013-12-31 | 2014-04-02 | 中国天辰工程有限公司 | Method for removing sodium by silicon-aluminum-phosphor molecular sieve catalyst |
| CN105366690B (en) * | 2014-08-15 | 2018-01-19 | 中国石油天然气集团公司 | A kind of y-type zeolite with transgranular multi-stage porous and preparation method and application |
| WO2016023523A1 (en) * | 2014-08-15 | 2016-02-18 | 中国石油天然气集团公司 | Y-shaped zeolite having in-crystal multi-level pores, method for preparation of said zeolite, and use thereof |
| CN105366690A (en) * | 2014-08-15 | 2016-03-02 | 中国石油天然气集团公司 | Y-type zeolite with intracrystalline hierarchical pores and preparation method and application thereof |
| CN104261426B (en) * | 2014-10-08 | 2016-06-29 | 山东齐鲁华信高科有限公司 | A kind of preparation method of low-Na and high-Si Y-type molecular sieve |
| CN104261426A (en) * | 2014-10-08 | 2015-01-07 | 山东齐鲁华信高科有限公司 | Preparation method for low-sodium high-silicon Y type molecular sieve |
| CN112209402A (en) * | 2019-07-12 | 2021-01-12 | 中国石油化工股份有限公司 | Ion exchange method for alkali metal-containing molecular sieve |
| CN112516957A (en) * | 2019-11-26 | 2021-03-19 | 上海朗彤环境科技发展有限公司 | Adsorbent and preparation method thereof, chlorine dioxide solid preparation and preparation method thereof |
| CN112516957B (en) * | 2019-11-26 | 2022-08-02 | 上海朗彤环境科技发展有限公司 | Adsorbent and preparation method thereof, chlorine dioxide solid preparation and preparation method thereof |
| CN111573689A (en) * | 2020-07-09 | 2020-08-25 | 山西腾茂科技有限公司 | USY molecular sieve and preparation method thereof |
| CN112897550A (en) * | 2021-04-06 | 2021-06-04 | 山西腾茂科技股份有限公司 | Metal modified Y-type molecular sieve and preparation method thereof |
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