CN101306391B - Preparation method of high abrasion strength molecular sieve fluidized-bed catalyst - Google Patents
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Abstract
The invention relates to a method for preparing high abrasive resistance molecular sieve fluidized bed catalyst, and mainly solves the problems that the wear resistant property of the fluidized bed catalyst is poor and the preparation energy consumption is high in the prior art. The method better solves the problems by adopting the technical proposal comprising the following steps: firstly, molecular sieve, binding agent, basis material, catalyst fine powder and liquid medium are uniformly mixed to form suspending fluid; secondly, the suspending fluid is shorn at high speed till the scales of 90 percent of particles in the particle smaller than 8 micrometers; thirdly, the suspending fluid is dried to form microspheroidal catalyst; fourthly, finished catalyst is formed through performing high-temperature roasting to the microspheroidal catalyst. The method can be applied to the reaction process for producing light alkenes from carbinol or dimethyl ether material.
Description
Technical field
The present invention relates to a kind of method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst, particularly about a kind of preparation method who is used for the molecular sieve fluid bed catalyst of methyl alcohol or dimethyl ether raw material production low-carbon alkene.
Background technology
Ethene and propylene can be used for producing plastics and other chemical products, are important Organic Chemicals, and along with the progress and the development of modern society, its demand is increasing.Ethylene yield more than 98% comes from steam cracking technology in the world at present, and production of propylene mainly produces the joint product of ethene with steam cracking and two kinds of forms of byproduct of oil plant catalytic cracking obtain.Because the sustainable growth of oil demand, production capacity increase the non-renewable of limited and petroleum resources, crude oil price ascendant trend in recent years, the production cost of ethene, propylene is risen thereupon, and verified petroleum resources and only can exploit nearly 50 years by the existing level of production, exploitation non-conventional oil utilization of resources technology is extremely urgent.
Methyl alcohol is a kind of common large industrial chemicals, can be produced as raw material by coal, natural gas, living beings, solid waste etc., and raw material sources are very extensive.Raw materials such as natural gas obtain synthesis gas (CO+H by partial oxidation process or steam reforming
2), under the effect of catalst for synthesis of methanol (as copper/zinc oxide catalyst), in synthesis reactor, transform and obtain methyl alcohol then.Natural gas or coal are produced methyl alcohol through synthesis gas and have been realized industrialization, and scale constantly enlarges, technology becomes better and approaching perfection day by day.Non-oil resource such as natural gas resource are abundant relatively, although with very high consumption speed increment, worldwide natural gas supply still can guarantee more than 100 year.Therefore, in coming few decades, great change will take place in worldwide energy resource structure.Consider that from the diversification and the sustainable deliverability of energy resource structure the non-conventional oil utilizations of resources such as natural gas just more and more come into one's own.
Methanol-to-olefins (Methanol-To-Olefin is called for short MTO) is meant and utilizes the methyl alcohol of being produced by natural gas or coal usually, generate the technology of low-carbon alkenes such as polymer grade ethylene, propylene under catalyst action.The MTO technology has been opened up a new technology route producing chemical products from the non-conventional oil resource, has become one of new forms of energy resource technical research exploitation focus.
The methanol-to-olefins process need be carried out under the effect of the shape selective catalysis of molecular sieve.Molecular sieve is the natural or artificial synthetic zeolite type crystal aluminosilicate of a class.Its chemical general formula is Mx/n ((AlO
2) x (SiO
2) y) mH
2O, M is that chemical valence is the metal ion of n, normally Na in the formula
+, K
+, Ca
2+Deng.Molecular sieve has the skeleton structure of porous, and uniform passage in many apertures and marshalling, the sizable hole of inner surface are arranged in structure.These crystal can only allow the diameter molecule littler than hole aperture to enter the hole, thereby the molecule that varies in size is separated, and play the effect of screening molecule, so gain the name.According to SiO in the sial acid group
2/ Al
2O
3The ratio difference, molecular sieve can be divided into A type, X type, Y type and modenite etc.
Molecular sieve is widely used in isolation technics and catalysis technique, for example is used for separating of materials such as protein, polysaccharide and synthetic high polymer, also can be used as the drier of gas and liquid.With the molecular sieve is that the catalyst that active component makes is used as solid acid catalyst usually.In recent years, the non-acid of molecular sieve catalytic reaction (comprising reactions such as oxidation, reduction, hydro carbons are oligomeric, carbonylation) arouses attention day by day.Also find to replace aluminium and silicon with other hetero atoms (as gallium, germanium, iron, boron, phosphorus etc.), formed heteroatoms zeolite molecular sieve has some special catalytic performance.
A lot of molecular sieves all can be used for the catalyst activity component of methanol-to-olefins, such as widely known ZSM-5 molecular sieve, SAPO molecular sieve etc.Other molecular sieves that can be applicable to methanol to olefins reaction have T zeolite, ZK-5, erionite and chabasie etc., and US4062905 is described this.Patent US4079095 has described the process that adopts ZSM-34 molecular sieve catalytic methanol-to-olefins; Patent US4310440 has described AlPO
4The process of molecular sieve catalytic methanol-to-olefins.By at present, the molecular sieve that is applied to the MTO course of reaction is the best with the performance of SAPO-34 molecular sieve.The SAPO-34 molecular sieve is a kind of SAPO microporous crystal, structure is similar to chabasie, belong to trigonal system, has three-dimensional open-framework, its orifice diameter is about 0.43nm, and is littler than the molecular sieve bore diameter of wide range of industrial applications such as Y, ZSM-5, mercerising, Beta, has strong shape selectivity, thereby show when being used for methanol to olefins reaction functional, the selectivity of low-carbon alkene is higher.
When molecular sieve is applied to Industrial Catalysis, generally can not adopts 100% molecular sieve to be prepared into catalyst and be applied to industrial process.Self caking property of molecular sieve is poor, and self granularity is too tiny, is difficult to be shaped to the catalyst that directly applies to industrial process.The manufacturing cost of molecular sieve is generally than higher, if adopt 100% molecular sieve as industrial catalyst, will make the operating cost of industrial process increase.Industrial process generally requires catalyst to possess certain shape and intensity to be adapted to industrial reactor.For fixed bed reactors, catalyst need not to move after installing, but catalyst need possess certain crush strength, to prevent in dress agent process that catalyst is hit and damaged, and prevents to be installed in the catalyst of lower floor owing to bearing pressure and breakage.The rising that the damaged efflorescence of catalyst may cause device pressure to fall, reflex action may occur unusually, and the product composition changes, and is unfavorable for the goal response process.For fluidized-bed reactor, because this constantly circulates catalyst or turbulence in reactor, friction between catalyst granules and particle, catalyst and wall of reactor, catalyst and regenerator wall, catalyst and heat collector wall, catalyst and the conveyance conduit wall and collision all can make catalyst levigate and damaged, final form effusion reaction system with fine powder.These fine powders pollute the environment, and the use cost of catalyst is risen.Therefore, no matter be that molecular sieve is applied to fixed bed reactors, still be applied to fluidized-bed reactor, all need pass through molecular sieve and carrier material the effect formation molecular sieve catalyst composition of binding agent; This combination of molecular sieve can have catalytic activity, selectivity, stability, shape and intensity concurrently simultaneously, thereby satisfies the requirement of industrial process to catalyst.
The US6509290 patent disclosure a kind of method for preparing molecular sieve catalyst, contain molecular sieve in this catalyst and grind particle and initial molecule sieve.This grinds particle mainly from the broken particle of Catalyst Production technology and reaction system recirculation.This method comprises molecular sieve, original binding agent and filler, spray-diredly grinds particle or agglomerate and be mixed together from the non-original particle that grinds of reaction unit.With this mixture drying, form the finished product catalyst granules.In order to increase the intensity of catalyst granules, this grinds particle and is substantially free of coke.
The US6153552 patent research a kind of method for preparing molecular sieve catalyst, this method comprises molecular sieve and alumina sol is mixed together, this alumina sol prepares in solution and remains under the pH value of 2-10, and this mixture of spray-drying and high-temperature roasting makes wear-resistant catalyst.
The CN1791463 patent disclosure a kind of method for preparing molecular sieve catalyst, this method comprise with molecular sieve, liquid and effectively the molecular sieve catalyst of the big drying of hardening capacity be mixed together the formation slurry, roasting behind dry this slurry forms wear-resistant catalyst.
Although more existing patents have related to the preparation method of fluid catalyst, the scuff resistance of fluid catalyst is lower, and the energy consumption in the preparation process needs further to reduce.
Summary of the invention
Technical problem to be solved by this invention is relatively poor, the energy consumption problem of higher of anti-wear performance of the molecular sieve fluid bed catalyst that exists in the prior art, and a kind of new molecular sieve fluid bed catalyst preparation method is provided.The fluid catalyst that this method makes has scuff resistance height, advantage that catalytic performance is good.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is as follows: a kind of method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst may further comprise the steps: (a) molecular sieve, binding agent, matrix material, catalyst fines, liquid medium are uniformly mixed to form suspension; (b) this suspension of high speed shear, 90% particle scale in suspension is less than 8 microns; (c) dry this suspension forms microspherical catalyst; (d) this microspherical catalyst of high-temperature roasting forms finished catalyst.
In technical scheme of the present invention, preferred version is as follows: the binding agent preferable range is 2.0 heavy～50 weight % in the catalyst that makes; The molecular sieve preferable range is 5.0～80 weight %; The catalyst fines preferable range is 1.0～80 weight %; The carrier material preferable range is 0.0～90 weight %; The catalyst fines preferred version comes from reaction unit, particularly, and the catalyst fines of the reaction system of overflowing after promptly catalyst grinds; The temperature of high-temperature roasting is 500～1000 ℃; The solids content of suspension is 20～50%; The pH value of suspension is between 2.5 to 5.5; The molecular sieve preferred version is selected from least a among SAPO-5, SAPO-11, SAPO-17, SAPO-18, SAPO-34, SAPO-35, SAPO-44, SAPO-47, SAPO-56 or the ZSM-5; The binding agent preferred version is a kind of colloidal sol, and more preferably scheme is Ludox or aluminium colloidal sol; The carrier material preferred version is selected from a kind of clay, and more preferably scheme is selected from kaolin; The catalyst of spray-drying preparation is through after the high-temperature roasting, have preferable range for less than 1.5 weight %/hour abrasion index, more preferably scope be less than 1.0 weight %/hour abrasion index, most preferred range be have less than 0.5 weight %/hour abrasion index.A) preferred version of molecular sieve described in the step is moisture molecular sieve, and wherein the moisture content of molecular sieve is 1%～90%.
Because catalyst granules is constantly circulation in reaction-regeneration system, the broken fine-powdered of catalyst granules is inevitable basically, and according to the difference of catalyst strength, broken ratio, speed can be different.For fine powder is recycled, avoid the operating cost of contaminated environment, reduction device, fine powder need be dropped among the production of catalyst again.And fine powder itself is the particle that hardens one by one, has higher intensity, can bring favorable influence to the intensity of catalyst when reconfiguring with molecular sieve, binding agent etc.In addition, during molecular sieve suspension before preparation spraying, the molecular sieve that washing is finished does not carry out drying, directly after the mensuration water content, and is prepared catalyst after binding agent, matrix material, water, catalyst fines etc. mix.This programme has reduced the molecular sieve drying after the washing and the step of efflorescence, has reduced energy consumption.Simultaneously,, when the suspension of preparing before spraying, can stir and save time, in the relatively short time, reach even preferably dispersion because the solid particle in the moisture molecular sieve is discrete relatively.
This patent is found, adopts technical scheme: (a) molecular sieve, binding agent, matrix material, catalyst fines, liquid medium are uniformly mixed to form suspension; (b) this suspension of high speed shear, 90% particle scale in suspension is less than 8 microns; (c) dry this suspension forms microspherical catalyst; (d) this microspherical catalyst of high-temperature roasting forms finished catalyst, and the finished catalyst that obtains has higher scuff resistance, its abrasion index can reach 0.03 weight %/hour, obtained better technical effect.
The invention will be further elaborated below by embodiment, but be not limited only to present embodiment.
The specific embodiment
[embodiment 1]
According to ratio 16% (weight) ZSM-5 molecular sieve: 10% (weight) kaolin: 10% catalyst fines: 4% (weight) aluminium colloidal sol: 60% (weight) deionized water takes by weighing raw material.Outside dewatering, the proportion raw material ratio is the butt weight ratio herein.Solid content is 40 weight % among this embodiment.
ZSM-5 molecular sieve and certain water are mixed, stirred 2 hours, fully stir, form uniform molecular sieve suspension after 15 minutes with the high-speed shearing machine high speed shear; Among suspension, add aluminium colloidal sol, stirred fast 15 minutes, sheared 15 minutes with high-speed shearing machine; Add a certain amount of kaolin, stirred 30 minutes, reach uniform state after, carry out high speed shear with high-speed shearing machine and mix the suspension that obtained in 45 minutes before the spray-drying.Measure the granularity of this suspension with laser particle analyzer, its average grain diameter is 3.5 microns.Carry out 700 ℃ of high-temperature roastings behind this suspension of spray-drying, measure abrasion index and be 0.03 weight %/hour.
[embodiment 2～4]
Identical with the charging sequence of [embodiment 1], just when carrying out the preparation of suspension, shear time shortens, and has obtained different suspension particle yardsticks, and has influenced the abrasion index of catalyst, and correlated results sees Table 1.
Table 1
| Embodiment | Suspension particle average dimension (micron) | Abrasion index (weight %/hour) |
| Embodiment 2 | 4.6 | 0.092 |
| Embodiment 3 | 3.8 | 0.05 |
| Embodiment 4 | 2.9 | 0.03 |
[comparative example 1]
Identical with the charging sequence of [embodiment 1], just when carrying out the preparation of suspension, shear time shortens, and has obtained different suspension particle yardsticks, and has influenced the abrasion index of catalyst, and correlated results sees Table 2.
Table 2
| Comparative example | Suspension particle average dimension (micron) | Abrasion index (weight %/hour) |
| Comparative example 1 | 8.5 | 2.77 |
[embodiment 5～9]
Identical with the operating procedure and the experimental condition of [embodiment 1], when being formulated suspension, the fine powder of adding accounts for the ratio difference of institute's controlling catalyst, and correlated results sees Table 3.
Table 3
| Embodiment | The ratio that adds fine powder | Abrasion index (weight %/hour) | Catalytic performance (ethene+propylene) selectivity |
| Embodiment 5 | 5％ | 0.46 | 81.98％ |
| Embodiment 6 | 20％ | 0.07 | 81.12％ |
| Embodiment 7 | 40％ | 0.07 | 80.78％ |
| Embodiment 8 | 60％ | 0.06 | 80.05％ |
| Embodiment 9 | 80％ | 0.05 | 79.67％ |
[comparative example 2]
Identical with the operating procedure and the experimental condition of [embodiment 1], do not add fine powder and carry out Preparation of Catalyst.Correlated results sees Table 4.
Table 4
| Comparative example | The ratio that adds fine powder | Abrasion index (weight %/hour) |
| Comparative example 2 | 0 | 0.88 |
[embodiment 10～15]
Identical with the operating procedure and the experimental condition of [embodiment 1], just change the kind that adds molecular sieve, what obtain the results are shown in Table 5.
Table 5
| Embodiment | The molecular sieve kind | Abrasion index (weight %/hour) |
| Embodiment 10 | SAPO-11 | 0.07 |
| Embodiment 11 | SAPO-18 | 0.03 |
| Embodiment 12 | SAPO-34 | 0.09 |
| Embodiment 13 | SAPO-44 | 0.05 |
| Embodiment 14 | SAPO-47 | 0.04 |
| Embodiment 15 | SAPO-56 | 0.09 |
[embodiment 16～18]
Identical with the operating procedure and the experimental condition of [embodiment 1], just change the weight that adds entry, obtain the suspension of different solid contents, what obtain the results are shown in Table 6.
Table 6
| Embodiment | Suspension solid content | Abrasion index (weight %/hour) |
| Embodiment 16 | 25％ | 0.17 |
| Embodiment 17 | 35％ | 0.07 |
| Embodiment 18 | 45％ | 0.09 |
[embodiment 19～22]
Identical with the operating procedure and the experimental condition of [embodiment 1], just contain the water that accounts for wet molecular sieve 30% in the molecular sieve, this part water is included in the deionized water and measures, and suspension solid content is 40%.After the preparation of finishing suspension, regulate the pH value of suspension by adding ammoniacal liquor.Correlated results sees Table 7.
Table 7
| Embodiment | The suspension pH value | Abrasion index (weight %/hour) |
| Embodiment 19 | 3.4 | 0.07 |
| Embodiment 20 | 3.8 | 0.15 |
| Embodiment 21 | 4.3 | 0.22 |
| Embodiment 22 | 4.8 | 0.98 |
[embodiment 23～26]
Identical with the operating procedure and the experimental condition of [embodiment 1], the molecular sieve moisture content difference that when formulated suspension, adds just.Correlated results sees Table 8.
Table 8
| Embodiment | The molecular sieve moisture content | Abrasion index (weight %/hour) |
| Embodiment 23 | 10％ | 0.07 |
| Embodiment 24 | 40％ | 0.05 |
| Embodiment 25 | 60％ | 0.12 |
| Embodiment 26 | 75％ | 0.18 |
Claims (7)
1. a method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst may further comprise the steps: (a) molecular sieve, binding agent, carrier material, catalyst fines, liquid medium are uniformly mixed to form suspension; (b) this suspension of high speed shear, 90% particle scale in suspension is less than 8 microns; (c) dry this suspension forms microspherical catalyst; (d) this microspherical catalyst of high-temperature roasting forms finished catalyst; Wherein, catalyst fines comes from reaction unit; Binding agent accounts for 2.0～50 weight % in the catalyst that makes; Molecular sieve accounts for 5.0～80 weight %; Catalyst fines accounts for 1.0～80 weight %; Carrier material accounts for 0.0～90 weight %; At least a in SAPO-5, SAPO-11, SAPO-17, SAPO-18, SAPO-34, SAPO-35, SAPO-44, SAPO-47, SAPO-56 or ZSM-5 of molecular screening; Binding agent is a kind of colloidal sol, and carrier material is a kind of clay; Drying described in the step (c) is a spray-drying, and the catalyst of spray-drying preparation is through after the high-temperature roasting, have less than 1.5 weight %/hour abrasion index.
2. the method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst according to claim 1 is characterized in that, catalyst fines is the fine powder that catalyst grinds the reaction system of overflowing afterwards; The temperature of high-temperature roasting is 500～1000 ℃.
3. the method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst according to claim 1, the solids content that it is characterized in that suspension is 20～50%, the pH value of suspension is between 2.5 to 5.5.
4. the method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst according to claim 1, the catalyst that it is characterized in that spray-drying preparation be through after the high-temperature roasting, have less than 1.0 weight %/hour abrasion index.
5. the method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst according to claim 1, the catalyst that it is characterized in that spray-drying preparation be through after the high-temperature roasting, have less than 0.5 weight %/hour abrasion index.
6. the method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst according to claim 1 is characterized in that binding agent is Ludox or aluminium colloidal sol; Carrier material is a kaolin.
7. the method for preparing high abrasion resistance strength molecular sieve fluid bed catalyst according to claim 1 is characterized in that a) the described molecular sieve of step is moisture molecular sieve, and wherein the moisture content of molecular sieve is 1%～90%.
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| CN102847562B (en) * | 2012-09-28 | 2015-07-22 | 神华集团有限责任公司 | Catalyst and preparation method thereof |
| CN103769237A (en) * | 2012-10-17 | 2014-05-07 | 中国石油化工股份有限公司 | Method for improving wear-resisting property of fluidized bed catalyst |
| CN103736519A (en) * | 2012-10-17 | 2014-04-23 | 中国石油化工股份有限公司 | Preparation method of wear-resistant molecular sieve fluidized bed catalyst |
| CN104549482B (en) * | 2013-10-28 | 2017-02-08 | 中国石油化工股份有限公司 | Preparation method of MgO-modified silicoaluminophosphate fluidized bed catalyst |
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Application publication date: 20081119 Assignee: Sinopec Nanjing Catalyst Co.,Ltd. Assignor: SHANGHAI Research Institute OF PETROCHEMICAL TECHNOLOGY SINOPEC Contract record no.: X2023310000030 Denomination of invention: Preparation of High Abrasion Resistance Molecular Sieve Fluidized Bed Catalyst Granted publication date: 20100721 License type: Common License Record date: 20230316 |