CN1511632A - Carrier for producing silver catalyst for epoxy ethane production, its preparing method and use - Google Patents
Carrier for producing silver catalyst for epoxy ethane production, its preparing method and use Download PDFInfo
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- CN1511632A CN1511632A CNA021600813A CN02160081A CN1511632A CN 1511632 A CN1511632 A CN 1511632A CN A021600813 A CNA021600813 A CN A021600813A CN 02160081 A CN02160081 A CN 02160081A CN 1511632 A CN1511632 A CN 1511632A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
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- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
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Abstract
The present invention relates to the alumina carrier for Ag catalyst, its preparation process and prepared Ag catalyst as well as the use of the catalyst in oxidizing ethylene to produce epoxy ethane. The preparation of the alpha-alumina carrier is prepared through mixing alpha-alumina trihydrate, pesudo-alpha-alumina hydrate, carbon containing material capable of burning out, flux, fluoride and heavy alkali earth metal compound in certain proportion while adding adhesive and water, kneading, extrusion to form, drying and roasting. The carrier has specific surface area of 0.2-2.0 sq m/g, porosity of 0.5-0.85 ml/g, water absorption not less than 60 % and crushing strength 20-90 N each grain. The carrier is produced into the catalyst via soaking in the solution of argentamine, alkali metal compound and alkali earth metal compound, drying and activating.
Description
Technical field
The present invention relates to a kind of carrier, its preparation method and application thereof that is used for silver catalyst, more particularly the present invention relates to a kind of ethene oxidation production oxirane that is used for alumina support, its preparation method of silver catalyst and the silver catalyst that makes by this carrier, also relate to the purposes of this catalyst in ethene oxidation production oxirane.
Background technology
The ethene oxidation mainly generates oxirane under the silver catalyst effect, side reaction takes place simultaneously generate carbon dioxide and water, and wherein activity, selectivity and stability are the main performance index of silver catalyst.So-called activity is meant reaction temperature required when process for ethylene oxide production reaches certain reaction load.Reaction temperature is low more, and activity of such catalysts is high more.So-called selectivity is meant that conversion of ethylene in the reaction becomes the ratio of the overall reaction molal quantity of the molal quantity of oxirane and ethene.So-called stability then is expressed as active and fall off rate optionally, and the fall off rate stability of small catalyst more is good more.The silver catalyst that uses high activity, high selectivity and have good stability in the process of ethene oxidation production oxirane can be increased economic efficiency greatly, and the silver catalyst of therefore making high activity, high selectivity and good stability is the main direction of silver catalyst research.The performance of silver catalyst has the important relationship except that composition and the preparation method with catalyst, and also the performance and the preparation method of the carrier that uses with catalyst have important relationship.
In the prior art preparation method of silver catalyst comprise the preparation and administration to active component of porous carrier (as aluminium oxide) and auxiliary agent to as described in this two processes on the carrier.
In the preparation process of silver catalyst, for α-Al
2O
3Carrier for key component, suitable specific surface and pore structure need, and will reaction heat be spread out for epoxidation of ethylene provides enough spaces on the one hand, also help the timely desorption of product oxirane on the other hand, avoid deep oxidation to generate the accessory substance carbon dioxide.It is 0.2～2m that the gibbsite that China authorization patent CN1009437B (China Petrochemical Corporation etc., 1988) has disclosed the ratio appropriate mix is mixed with out specific surface
2/ g, pore volume are greater than the alumina support of 0.5ml/g, and wherein pore radius accounts for below 25% greater than the hole of 30 μ m, is used for epoxidation of ethylene and can reaches 83～84% selectivity.
Add other component and improve carrier in alumina support, the performance that improves silver catalyst also is an important research direction, comprising adding alkaline earth oxide or its salt.
European patent EP 0150238 (US4428863) is used a small amount of barium aluminate or barium silicate binding agent in the manufacture process of high-purity, low surface oxidation alumina supporter, claim crushing strength and the wear resistance of improving carrier, and the specific surface of the carrier that patent is made is less than 0.3m
2/ g, catalyst activity of making and selectivity are all lower.Contain a certain amount of Ca, Al, K, Na soluble salt in the alumina support that US4740493 (EP0211397), US4829043 (EP0271814) and EP0501317 patent are used, claim and reduced the fall off rate of catalyst selectivity in the use.US5384302 claims by preliminary treatment α-Al
2O
3Na, K, Ca, Al ion concentration in the minimizing carrier improved the crushing strength and the abrasion resistance properties of carrier.EP0712334 loads with the rhenium of the magnesium of the alkali metal of the silver of effective dose, amount of auxiliary, amount of auxiliary and amount of auxiliary on the carrier that contains 85% aluminium oxide and 0.001～2% magnesium that exists with oxide form at least and makes silver catalyst, has improved the stability of catalyst.US5100859, US5145824 (EP0496470), EP0900126 (WO9740932), US5801259 (WO9740933), US5733842 add α-Al with alkaline-earth metal, silicon, zirconium
2O
3Make carrier, silver catalyst is made in dipping silver, alkali metal promoter, rhenium auxiliary agent and assistance agent thereof then, and patent is pointed out the preferred calcium of alkaline-earth metal, and strontium and barium salt use with the compound of zirconium, can't learn and add the two influence to catalyst performance.
Although having added alkaline earth metal compound respectively in alumina raw material, above-mentioned patent documentation improves alumina support, especially barium aluminate and barium silicate have been used, but only played the effect of binding agent, intensity to carrier improves to some extent, activity of such catalysts and selectivity are not brought tangible influence, therefore this area still needs carrier is improved, and is beneficial to produce performance silver catalyst better.
Summary of the invention
Situation in view of above-mentioned prior art, the present inventor has carried out research extensively and profoundly in the silver catalyst field, found that adding heavy alkaline earth metal compounds in alumina raw material makes carrier, through the solution that dipping silver compound, organic amine and specific auxiliary agent are mixed with, prepared activity, the selectivity of silver catalyst in ethylene oxidation reactions all is improved after the heat treatment in containing oxygen gas mixture.
Therefore, the purpose of this invention is to provide a kind of novel carriers, in the process of ethene oxidation production oxirane, demonstrate good activity, selectivity by its silver catalyst of making.
Another object of the present invention provides a kind of preparation method of above-mentioned carrier.
A further object of the present invention provides a kind of silver catalyst by above-mentioned preparing carriers.
An also purpose of the present invention provides the application of above-mentioned silver catalyst in ethene oxidation production oxirane.
These and other purposes of the present invention, feature and advantage will become more clear after reading this specification.
Detailed Description Of The Invention
One aspect of the present invention provides a kind of preparation to be used for the ethene oxidation and has produced the method for oxirane with the alumina support of silver catalyst, comprises the steps:
I) preparation has the mixture of following composition:
A) based on the solid mixture gross weight be 50 orders～150 orders, the three water α-Al of 0～80% weight
2O
3
B) based on the solid mixture gross weight be 150 orders～250 orders, the three water α-Al of 0～80% weight
2O
3
C) based on the solid mixture gross weight be 250 orders～500 orders, the three water α-Al of 5～80% weight
2O
3
D) be that the granularity of 5～30% weight is greater than the false water α-Al of 200 purposes based on the solid mixture gross weight
2O
3
E) but be the after-flame carbonaceous material of 5～30% weight based on the solid mixture gross weight;
F) based on the solid mixture gross weight be the flux of 0.01～2.0% weight;
G) based on the solid mixture gross weight be the fluoride-mineralization agent of 0.01～2.0% weight;
H) based on containing of solid mixture gross weight 0.01～5.0% weight of heavy alkaline earth metal compounds;
I) be the binding agent of 25～60% weight based on component gross weight a)-h); And
J) an amount of water;
II) with I) in the mixture that obtains mediate evenly and extrusion molding; With
III) product that obtains dry II), at high temperature roasting becomes α-Al then
2O
3
The present invention provides a kind of porous alpha-alumina supports that makes as stated above, wherein α-Al on the other hand
2O
3Content is more than 90%, and the amount of heavy alkaline earth metal compound is counted 0.01～2.0% of vehicle weight with alkaline-earth metal, and has following feature: crushing strength is 20N/ grain～90N/ grain; Specific surface is 0.2～2.0m
2/ g; Water absorption rate is not less than 60%; Pore volume is 0.50～0.85ml/g.
Further aspect of the present invention provides a kind of novel silver catalyst, and described catalyst is prepared by a method comprising the following steps:
1) usefulness contains the above-mentioned porous alpha-alumina supports of solution impregnation of silver compound, organic amine, alkali metal promoter and the base earth metal promoter of q.s;
2) elimination maceration extract, dry impregnated carrier; With
3) in containing oxygen gas mixture to step 2) the gained carrier activates, and makes described silver catalyst; It is 1%～30% silver, the alkali metal of 5ppm～2000ppm and the alkaline-earth metal of 20ppm～28000ppm that this catalyst contains based on its gross weight.
The present invention also relates in one aspect to the application of above-mentioned novel silver catalyst in ethene oxidation production oxirane.
The adding of flux is in order to make carrier have good intensity under low sintering temperature.The example of flux comprises magnesium compound, for example the mixture of one or more in magnesia, magnesium sulfate, magnesium nitrate and the magnesium carbonate.
But the adding of after-flame carbonaceous material is in order to make macropore, thereby makes carrier have proper pore structure and specific surface.Described carbonaceous material comprises a kind of or its mixture in petroleum coke, carbon dust, graphite, polyethylene, polypropylene, the rosin etc.Carbonaceous material is oxidation in roasting process, generates gas and overflows, and forms macropore in carrier.Granularity according to carbonaceous material of the present invention is 20～300 orders, and preferred size is 20～60 orders and 30～300 purpose mixtures, and the ratio (based on weight) of the two consumption is 0.05～5.0: 1, preferred 0.1～3.0: 1.The addition of described carbonaceous material is 5～30% weight of mixture total weight amount, preferred 20～30% weight, and adding too much can make the intensity of carrier obviously descend.
The fluoride-mineralization agent that the present invention selects for use comprises hydrogen fluoride, ammonium fluoride, aluminum fluoride, magnesium fluoride, ice crystal etc., and the crystal formation that its role is to accelerated oxidation aluminium transforms, and eliminates the following pore of 5 μ m.
The heavy alkaline earth metal compound that the present invention adds comprises oxide, sulfate, acetate, nitrate and the oxalates etc. of strontium and/or barium, its role is to carrier is improved, and addition is 0.01～5% of a solid mixture gross weight.
The present invention is by adding binding agent, the vacation one water α-Al in it and the mixture
2O
3Generation aluminium colloidal sol bonds together each component, but becomes the paste of extrusion molding.Used binding agent comprises acid, as nitric acid, formic acid, acetate, propionic acid and hydrochloric acid etc.Also can use aluminium colloidal sol to replace being used as the acid and a false water α-Al of binding agent
2O
3When using acid as binding agent, aqueous solution of nitric acid preferably, wherein the weight ratio of nitric acid and water is 1: 1.25～10.
Can be dried to moisturely below 10% after the extrusion molding of gained paste, support shapes can be annular, spherical, cylindricality or porous cylindricality.Baking temperature is 80～120 ℃, and be controlled at 1 hour～24 hour according to moisture drying time.
In order to make carrier that enough intensity and good surface properties be arranged, preferably between 1250 ℃～1550 ℃, temperature is too high can to influence activity of such catalysts and the selectivity of making to sintering temperature, and the too low then support strength of sintering temperature is relatively poor.Dried paste makes aluminium oxide all be converted into α-Al by 1250～1550 ℃ of following roastings 2～6 hours
2O
3
The crushing strength of porous alumina carrier of the present invention is 20N/ grain～90N/ grain, preferred 30N/ grain～70N/ grain; Specific surface is 0.2～2.0m
2/ g, preferred 0.5～1.5m
2/ g; Water absorption rate is not less than 60%, preferably is not less than 65%; Pore volume is 0.50～0.85ml/g, preferred 0.55～0.80ml/g.
Silver catalyst of the present invention can prepare in the usual way, for example by preparing with the above-mentioned alumina support of the solution impregnation of a kind of Ag-containing compound, organic amine, alkali metal promoter and base earth metal promoter.
In the preparation of silver catalyst of the present invention, at first make the aqueous solution and the ammonium oxalate or the oxalic acid aqueous solution reaction of silver nitrate, separate out the silver oxalate precipitation, after the filtration, spend deionised water, until no nitrate ion, then silver oxalate is dissolved in organic amine such as pyridine, butylamine, ethylenediamine, 1, in the aqueous solution of 3-propane diamine, monoethanolamine or its mixture, add auxiliary agent, be made into dipping solution.Flood above-mentioned alumina support with the gained dipping solution then, drain, in being not more than 21% nitrogen oxygen atmosphere, air stream or oxygen content in 180～700 ℃, preferred 200-500 ℃ temperature range, kept 1 minute～120 minutes, and preferred 2 minutes～60 minutes, to carry out thermal decomposition.Also available silver oxide replaces silver nitrate, and silver oxalate also can not analysed filter, direct and organic amine complexing, impregnated carrier then.The amount of the silver compound that uses in the dipping process of the present invention should be enough to make argentiferous 1～30% weight in the finally prepd catalyst, and preferred 5～25% weight are in total catalyst weight.
Alkali metal promoter among the present invention can be compound or its mixture of lithium, sodium, potassium, rubidium or caesium, and alkali-metal content is 5ppm～2000ppm in the final catalyst, preferred 5ppm～1500ppm.Alkali metal promoter can be before dipping silver, simultaneously or be applied to afterwards on the carrier, also can after silver compound is reduced, be immersed on the carrier.
Base earth metal promoter among the present invention can be the compound of magnesium, calcium, strontium or barium, as oxide, oxalates, sulfate, acetate or nitrate, or its mixture, the total content of alkaline-earth metal is 20ppm～28000ppm in the final catalyst, preferred 30ppm～21000ppm.Base earth metal promoter can be before dipping silver, simultaneously or be applied to afterwards on the carrier, also can after silver compound is reduced, be immersed on the carrier.
Except alkali metal promoter above-mentioned and base earth metal promoter, can also add other auxiliary agents such as rhenium compound and coassist agent thereof, as perrhenic acid amine and coassist agent chromium thereof, molybdenum, tungsten, boron etc., with the activity of further improvement gained silver catalyst, selectivity and active and stability optionally.These other auxiliary agents can be before dipping silver, simultaneously or be applied to afterwards on the carrier, also can after silver compound is reduced, be immersed on the carrier.
The mensuration of catalyst performance
Various silver catalyst of the present invention is tested its initial performance and stability with laboratory reaction device (following letter " little anti-") evaluating apparatus.The reactor that the micro anti-evaluation device uses is the stainless steel tube of internal diameter 4mm, and reactor places heating jacket.The admission space of catalyst is 1ml, and inert filler is arranged at the bottom, makes beds be positioned at the flat-temperature zone of heating jacket.
Initial activity, optionally measure
The activity that the present invention uses and optionally condition determination is as follows:
Reacting gas is formed (mol%)
Ethene (C
2H
4) 28 ± 1
Oxygen (O
2) 7.4 ± 0.2
Carbon dioxide (CO
2)＜8
Cause steady gas (N
2) surplus
Inhibitor dichloroethanes 0.1ppm～2.0ppm
Reaction pressure 2.1MPa
Air speed 7000/h
Reactor outlet EO concentration 1.35%
Space-time yield 185gEO/mlCat./h
When stable reach above-mentioned reaction condition after the METHOD FOR CONTINUOUS DETERMINATION reactor go into, exit gas forms.Measurement result carries out calculating as follows after volume contraction is proofreaied and correct selectivity:
Wherein AEO works off one's feeling vent one's spleen poorly with the inlet gas ethylene oxide concentration, gets the result of the test of the average of 10 groups of above test datas as the same day.
The present invention has compared following advantage with prior art: porous alumina carrier made in accordance with the present invention, the silver catalyst of making has higher activity and selectivity, is specially adapted to the reaction that oxirane is produced in the ethene oxidation.
Embodiment
The present invention is described further below in conjunction with embodiment, but scope of the present invention is not limited to these embodiment.
Preparing carriers comparative example and embodiment 1-5
With 30～150 orders, 150～250 orders and 250～500 purposes, three water α-AlXO
3Each 104g, the false water α-Al of 200 purposes
2O
392g, petroleum coke 81g, NH
4F7g, Mg (NO
3)
28.5g and a certain amount of barium sulfate (is respectively comparative example 0g; Embodiment 1,1.28g; Embodiment 2,2.56g; Embodiment 3,3.84g; Embodiment 4,5.12g; Embodiment 5,6.40g) put into blender and mix, and change in the kneader, add 0.18 liter in rare nitric acid (nitric acid: water=1: 3, weight ratio), but are kneaded into the paste of extrusion molding.Extrusion molding is the five hole columns of external diameter 8.0mm, long 6.0mm, internal diameter 1.0mm, dries more than 2 hours down at 80～120 ℃, and free water content is reduced to below 10%.
Above-mentioned six examples, five hole columns are put into top-hat kiln, and through being elevated between 1350 ℃～1550 ℃ from room temperature about 30 hours, constant temperature 2 hours obtains six white α-Al
2O
3Support samples.
The carrier property data of measuring are listed in table 1.
The physical data table of table 1 preparing carriers comparative example and embodiment 1～5
| Sample number into spectrum | Barium sulfate addition (%) | The content (%) of barium in carrier | Mean intensity (N/ grain) | Specific surface (m 2/g) | Water absorption rate | Pore volume (ml/g) |
| Comparative example | ?0 | ?0 | ?35 | ?0.78 | ?71 | ?0.60 |
| Embodiment 1 | ?0.26 | ?0.18 | ?31 | ?0.64 | ?70 | ?0.58 |
| Embodiment 2 | ?0.51 | ?0.37 | ?35 | ?0.85 | ?69 | ?0.72 |
| Embodiment 3 | ?0.76 | ?0.55 | ?42 | ?0.96 | ?71 | ?0.66 |
| Embodiment 4 | ?1.01 | ?0.73 | ?45 | ?1.24 | ?72 | ?0.65 |
| Embodiment 5 | ?1.26 | ?0.91 | ?41 | ?1.06 | ?71 | ?0.75 |
Preparation of Catalyst comparative example and embodiment 1-5
Getting the 700g silver nitrate is dissolved in the 750ml deionized water.Get in the deionized water that the 325g ammonium oxalate is dissolved in 50 ℃ of 250ml.Under vigorous stirring, mix two kinds of solution, generate white silver oxalate precipitation.Aging more than 30 minutes, filter, spend deionised water and be precipitated to no nitrate ion.Filter cake argentiferous about 60%, moisture about 15%.
In the glass that band stirs, add the 300g ethylenediamine, 110g monoethanolamine, 375g deionized water.Stir following silver oxalate paste that makes and slowly add in the mixed liquor, temperature remains on below 40 ℃, and silver oxalate is all dissolved, and the addition of silver oxalate makes the maceration extract argentiferous 22% (weight) that makes.Add 2.2g cesium sulfate, 1.4g strontium acetate, add deionized water again and make the solution gross mass reach 2000g, make solution for later use.
Get the support samples of 100g preparing carriers comparative example and embodiment 1～5 preparation and put into the container that can vacuumize.Be evacuated to more than the 10mmHg, put into above maceration extract, the submergence carrier kept 30 minutes.Excessive solution is gone in leaching.Soaked carrier heated 5 minutes in 450 ℃ air stream, and silver catalyst for ethylene oxide is promptly made in cooling.
Silver and auxiliary agent content to the catalyst made are analyzed, and wherein content is in metal; Use the microreactor evaluating apparatus to measure the activity and the selectivity of catalyst sample under aforementioned process conditions, result of the test is listed in table 2.
The result of the test of the sample of table 2 Preparation of Catalyst comparative example and embodiment 1～5
| The sample title | Silver content (%) | The content of caesium (ppm) | The content of strontium (ppm) | The content of barium (%) | Reaction temperature (℃) | ?EO ?(％) | Selectivity (%) |
| Comparative example | ????17.1 | ??645 | ??252 | ????0 | ????231 | ?1.35 | ????83.2 |
| Embodiment 1 | ????17.2 | ??638 | ??248 | ????0.15 | ????229 | ?1.35 | ????84.2 |
| Embodiment 2 | ????17.0 | ??654 | ??255 | ????0.31 | ????222 | ?1.34 | ????84.3 |
| Embodiment 3 | ????16.8 | ??642 | ??245 | ????0.46 | ????227 | ?1.36 | ????83.9 |
| Embodiment 4 | ????17.3 | ??658 | ??259 | ????0.60 | ????230 | ?1.35 | ????83.8 |
| Embodiment 5 | ????17.2 | ??652 | ??255 | ????0.74 | ????231 | ?1.35 | ????84.2 |
Preparing carriers embodiment 6～8
The preparation procedure of repetition and above carrier, different is to replace barium sulfate to add 7g barium nitrate, 7g barium acetate and 4g strontium sulfate respectively, makes carrier embodiment 6～8, physical data is listed in table 3.
The physical data table of table 3 preparing carriers embodiment 6～8
| Sample number into spectrum | Additive | Barium in the carrier or strontium amount (%) | Mean intensity (N/ grain) | Specific surface (m 2/g) | Water absorption rate (%) | Pore volume (ml/g) | |
| Kind | Addition (%) | ||||||
| Comparative example | Do not have | ????0 | ????35 | ??0.78 | ????71 | ??0.60 | |
| Embodiment 6 | Barium nitrate | ????1.4 | ????1.25 | ????42 | ??0.96 | ????78 | ??0.74 |
| Embodiment 7 | Barium acetate | ????1.4 | ????1.28 | ????46 | ??1.15 | ????77 | ??0.76 |
| Embodiment 8 | Strontium sulfate | ????1.0 | ????0.66 | ????52 | ??0.88 | ????74 | ??0.68 |
Preparation of Catalyst embodiment 6～8
In the glass that band stirs, add the 300g ethylenediamine, 110g monoethanolamine, 375g deionized water.Stir following silver oxalate paste and slowly add in the mixed liquor, temperature remains on below 40 ℃, and silver oxalate is all dissolved, and the addition of silver oxalate makes the maceration extract argentiferous 22% (weight) that makes.Add 2.2g cesium sulfate, 1.1g barium acetate, add deionized water again and make the solution gross mass reach 2000g, make solution for later use.
Get the support samples of 100g preparing carriers embodiment 6～8 preparations and put into the container that can vacuumize.Be evacuated to more than the 10mmHg, put into above maceration extract, the submergence carrier kept 30 minutes.Excessive solution is gone in leaching.Soaked carrier heated 5 minutes in 450 ℃ air stream, and silver catalyst for ethylene oxide is promptly made in cooling.
Silver and auxiliary agent content to the catalyst made are analyzed, and wherein content is in metal; Use the microreactor evaluating apparatus to measure the activity and the selectivity of catalyst sample under aforementioned process conditions, result of the test is listed in the table below 4.
The result of the test of the sample of table 4 Preparation of Catalyst embodiment 6-8
| The sample title | Silver content (%) | The content of caesium (ppm) | The content of barium (ppm) | The content of strontium | Reaction temperature (℃) | ?EO ?(％) | Selectivity (%) |
| Comparative example | ??17.1 | ????645 | ??258 | ??- | ??231 | ?1.35 | ??83.2 |
| Embodiment 6 | ??17.2 | ????656 | ??10620 | ??- | ??227 | ?1.35 | ??83.8 |
| Embodiment 7 | ??17.0 | ????658 | ??10890 | ??- | ??221 | ?1.34 | ??83.7 |
| Embodiment 8 | ??16.9 | ????632 | ??256 | ??0.55％ | ??227 | ?1.35 | ??83.5 |
Claims (21)
1. one kind is used for the porous alpha-alumina supports that ethene oxidation production oxirane is used silver catalyst, and it contains heavy alkaline earth metal compound, and wherein the amount of heavy alkaline earth metal compound is counted 0.01～2.0% of vehicle weight with heavy alkaline-earth metal.
2. porous alpha-alumina supports according to claim 1 has following feature: specific surface is 0.2m
2/ g～2.0m
2/ g, preferred 0.5m
2/ g～1.5m
2/ g; Pore volume is 0.50～0.85ml/g, preferred 0.55～0.80ml/g; Water absorption rate 〉=60%, preferred 〉=65%; And crushing strength is 20N/ grain～90N/ grain, preferred 30N/ grain～70N/ grain.
3. porous alpha-alumina supports as claimed in claim 1 or 2, wherein α-Al
2O
3Content is more than 90%.
4. a method for preparing the described porous alpha-alumina supports of claim 1 comprises the steps:
I) preparation has the mixture of following composition:
A) based on the solid mixture gross weight be 50 orders～150 orders, the three water α-Al of 0～80% weight
2O
3
B) based on the solid mixture gross weight be 150 orders～250 orders, the three water α-Al of 0～80% weight
2O
3
C) based on the solid mixture gross weight be 250 orders～500 orders, the three water α-Al of 5～80% weight
2O
3
D) be that the granularity of 5～30% weight is greater than the false water α-Al of 200 purposes based on the solid mixture gross weight
2O
3
E) but be the after-flame carbonaceous material of 5～30% weight based on the solid mixture gross weight;
F) based on the solid mixture gross weight be the flux of 0.01～2.0% weight;
G) based on the solid mixture gross weight be the fluoride-mineralization agent of 0.01～2.0% weight;
H) based on the heavy alkaline earth metal compounds of solid mixture gross weight 0.01～5.0% weight;
I) be the binding agent of 25～60% weight based on component gross weight a)-h); And
J) an amount of water;
II) with I) in the mixture that obtains mediate evenly and extrusion molding; With
III) product that obtains dry II), at high temperature roasting becomes α-Al then
2O
3
5. method as claimed in claim 4, wherein said flux are the magnesium compounds that is selected from magnesia, magnesium sulfate, magnesium nitrate, magnesium carbonate and composition thereof; Described carbonaceous material is that petroleum coke, carbon dust, graphite, rosin, polyethylene, polypropylene or its mixture and its consumption are 20～30% of described mixture total weight amount; Described fluoride-mineralization agent is one or more the mixture in hydrogen fluoride, aluminum fluoride, ammonium fluoride, magnesium fluoride, the ice crystal.
6. method as claimed in claim 5, the granularity that it is characterized in that described carbonaceous material are 20～60 orders and 30～300 purpose mixtures, and part by weight is 0.05～5.0: 1.
7. method as claimed in claim 4, wherein said binding agent are acid.
8. method as claimed in claim 7 wherein replaces an acid and a false water α-Al with aluminium colloidal sol
2O
3
9. method as claimed in claim 7, wherein said acid are aqueous solution of nitric acid, and wherein the weight ratio of nitric acid and water is 1: 1.25～10.
10. method as claimed in claim 3 is characterized in that described heavy alkaline earth metal compounds is the oxide of strontium and/or barium, nitrate, acetate, oxalates or sulfate.
11. method as claimed in claim 4, wherein said II) the product roasting under 1250 ℃～1550 ℃ high temperature that obtains in.
12. produce the used silver catalyst of oxirane by the ethene oxidation for one kind, by the method preparation that may further comprise the steps:
1) use the solution impregnation of the silver compound, organic amine, alkali metal promoter and the base earth metal promoter that contain q.s according to each described porous alpha-alumina supports among the claim 1-3;
2) elimination maceration extract, dry impregnated carrier; With
3) in containing oxygen gas mixture to step 2) the gained carrier activates, and makes described silver catalyst.
13. silver catalyst as claimed in claim 12, wherein silver compound be silver oxide, silver nitrate or silver oxalate and its addition should to make the content of silver in described silver catalyst be 1%～30%, preferred 5%～25%, based on the gross weight of described silver catalyst.
14. silver catalyst as claimed in claim 12, wherein said alkali metal promoter is that should to make the content of described alkali metal in described silver catalyst be 5ppm～2000ppm for the compound of lithium, sodium, potassium, rubidium or caesium or its any two kinds combination and its addition, preferred 5ppm～1500ppm is based on the gross weight of described silver catalyst.
15. silver catalyst as claimed in claim 14, wherein said alkali metal are the combination of caesium or caesium and lithium.
16. silver catalyst as claimed in claim 12, wherein said base earth metal promoter is that should to make the total content of alkaline-earth metal in described silver catalyst be 20ppm～28000ppm for magnesium, calcium, strontium or barium or its any two kinds combination and its addition, preferred 30ppm～21000ppm is based on the gross weight of described silver catalyst.
17. silver catalyst as claimed in claim 16, wherein said alkaline-earth metal are barium or strontium.
18. silver catalyst as claimed in claim 12, wherein said auxiliary agent before dipping silver, simultaneously or be applied on the carrier afterwards, or after silver compound is reduced, be immersed on the carrier.
19. silver catalyst as claimed in claim 12, wherein said activation process are to carry out in air or oxygen content are not more than 21% nitrogen oxygen atmosphere.
20. silver catalyst as claimed in claim 12, the temperature of wherein said activation process are controlled between 180 ℃～700 ℃, the time of preferred 200 ℃～500 ℃ and described activation process is 1 minute～120 minutes, preferred 2 minutes～60 minutes.
21. a method of producing oxirane by the ethene oxidation is wherein used as each described silver catalyst in the claim 12～20.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021600813A CN1232349C (en) | 2002-12-31 | 2002-12-31 | Carrier for producing silver catalyst for epoxy ethane production, its preparing method and use |
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| Application Number | Priority Date | Filing Date | Title |
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| CNB021600813A CN1232349C (en) | 2002-12-31 | 2002-12-31 | Carrier for producing silver catalyst for epoxy ethane production, its preparing method and use |
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| Publication Number | Publication Date |
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| CN1511632A true CN1511632A (en) | 2004-07-14 |
| CN1232349C CN1232349C (en) | 2005-12-21 |
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