CN1884082A - Method for preparing pseudo-boehmite with large pore volume and high specific surface area - Google Patents
Method for preparing pseudo-boehmite with large pore volume and high specific surface area Download PDFInfo
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- CN1884082A CN1884082A CN 200610019438 CN200610019438A CN1884082A CN 1884082 A CN1884082 A CN 1884082A CN 200610019438 CN200610019438 CN 200610019438 CN 200610019438 A CN200610019438 A CN 200610019438A CN 1884082 A CN1884082 A CN 1884082A
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- boehmite
- pore volume
- pseudo
- crystal seed
- sodium aluminate
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Abstract
The invention discloses a preparing method of large-hole high-specific surface thin diaspore, which comprises the following steps: adding SB powder in the sodium aluminate solution with 110-200g/L-Al2O3 and 1.30-1.75 causticization coefficient; setting the quality rate of seed quantity and Al2O3 quality at 1.0 constantly; decomposing at 100-150 deg.c water heating condition for 3-6 h; sucking the cooled decomposed product; washing to neutral; washing through alcohol; drying; obtaining the product. The invention possesses high-seed activity and excellent water heating stability, which can provide higher-distinguishing rate within lower seed and shorter decomposing time.
Description
Technical field
The present invention relates to the preparation of pseudo-boehmite, relating in particular to a kind of is crystal seed with the SB powder, and the hydrothermal decomposition sodium aluminate solution prepares the method for large pore volume, high-ratio surface pseudo-boehmite.
Background technology
Pseudo-boehmite (pseudoboehmite) is a kind of chemical aluminum oxide uncertain, that crystallization is imperfect thereby performance is controlled of forming, and chemical formula is γ-AlOOHnH
2O (n=0.08～0.62), (γ-AlOOH) similar, typical structure are very thin fold lamella to its crystalline structure with boehmite.γ-the Al that obtains through the pseudo-boehmite roasting
2O
3Specific surface is higher, is widely used as support of the catalyst at petrochemical industry, and the γ-Al that obtains through the boehmite roasting
2O
3Specific surface is lower, generally is difficult to use in catalytic field.
The SB powder is that a kind of that German Condea company succeeds in developing revolved bits and higher alcohols (Pentyl alcohol, n-hexyl alcohol) is the high-quality pseudo-boehmite of raw material production with rafifinal, the SB powder since good, the pore structure control easily of crystal formation, specific surface and purity height widely used at catalytic field.---aluminum oxide---the working cycle of aluminium---aluminium alcoholates---aluminium hydroxide that aluminium hydroxide has been experienced in its production.But there is toxicity in the organic solvent that this method is used, and production cost is also higher.And with bayer's process bauxite stripping intermediate---cheap wrought aluminum acid sodium solution is a raw material, adopts the sodium aluminate solution crystal seed decomposition technique, directly produces the performance high quality pseudo-boehmite close with the SB powder, just might overcome the shortcoming of SB powder manufacturing process.
The decomposition of crystal seed of sodium aluminate solution is the critical process in the metallurgical-grade aluminum oxide production process, and traditional decomposition of crystal seed is to add the gibbsite crystal seed and to separate out aluminium hydroxide (Al (OH)
3) be the basis, not only the resolving time is long, rate of decomposition is low, and Al (OH)
3The process energy consumption height, the quality product that change into aluminum oxide are difficult to regulation and control.
Adopt boehmite decomposition of crystal seed sodium aluminate solution to prepare the existing report of method of boehmite.WO9,858,876 disclose a kind of 90 ℃ of following sodium aluminate solutions decomposes the method for preparing boehmite, and crystal seed is the boehmite that obtains after the gibbsite hydrothermal treatment consists.At seed ratio is 1.76, and sodium aluminate solution is formed 90.0g/L-Na
2O, 99g/L-Al
2O
3Condition under, the rate of decomposition of sodium aluminate solution is 40.53% when decomposing 96h.The main drawback of this method is that the resolving time is long, and degradation production can only be as the precursor of metallurgical-grade aluminum oxide.
CN1186046A discloses a kind of elder generation and fed CO in sodium aluminate solution
2, treat the causticization factor alpha of solution
KAfter reducing to 1.20～1.30, decompose the method for preparing boehmite with sodium aluminate solution crystal seed again.Form 90～110g/L-Al at sodium aluminate solution
2O
3, 1.40～1.60,110～120 ℃ of causticization coefficients and seed ratio 2.0～2.5 condition under when decomposing 30h the rate of decomposition of sodium aluminate solution be 48～52%.The utilization ratio of aluminium is higher in this method solution, but degradation production can only feed CO as the precursor of metallurgical-grade aluminum oxide equally
2Also consumed the higher NaOH of utility value in the subsequent technique, the main operating parameters narrow limits also is unfavorable for the operation of seed precipitation process.
CN1733607A discloses a kind of method that greater activity boehmite crystal seed and decomposition sodium aluminate liquid thereof prepare micrometre grade thin diaspore for preparing.This method is earlier at 0～90 ℃, H
2O
2/ Al
2O
3=3.0～7.0 (mol ratios) are descended the H with 8～30%
2O
2Solution precipitation contains 50～250g/L-Al
2O
3, the causticization factor alpha
KBe 1.30～3.50 sodium aluminate solution, then with successively after filtration, washing, ethanol disperses and washing and the dry boehmite that obtains are crystal seed, forms 60～180g/L-Al at sodium aluminate solution
2O
3, causticization coefficient 1.30～1.80 and low seed ratio decompose down, the highest decomposition rate can reach more than 50%.
Investigator [Filippou D, Paspaliafris I.Light Metals.New York:the Minerals, Metals ﹠amp are arranged; MaterialsSociety, 1993.119] think that boehmite is that sodium aluminate solution decomposes getable unique degradation production between 100～150 ℃, if but adopt special decomposition technique, for example, add the activity that a certain amount of alcohol reduces water, might obtain pseudo-boehmite.The defective of existing sodium aluminate solution crystal seed decomposition technique is a normally low value-added metallurgical-grade aluminum oxide product such as gibbsite or boehmite of degradation production.
Summary of the invention
Technical problem to be solved by this invention is: provide a kind of sodium aluminate solution hydro-thermal decomposition of crystal seed to prepare the method for large pore volume, high-ratio surface pseudo-boehmite, this method can prepare the higher pseudo-boehmite product of added value.
The technical solution adopted for the present invention to solve the technical problems is: with the SB powder is crystal seed, and the hydrothermal decomposition sodium aluminate solution prepares large pore volume, high-ratio surface pseudo-boehmite, and concrete steps comprise:
With the SB powder as crystal seed, join and contain 110～200g/L-Al
2O
3With the causticization coefficient is to decompose Al in the add-on of crystal seed and the solution in 1.30～1.75 the sodium aluminate solution
2O
3Mass ratio be 1: 1, under airtight hydrothermal condition, decompose subsequently, degradation production;
2. degradation production is washed with water to neutrality behind cooling, vacuum filtration, gets neutral filter cake;
3. neutral filter cake is disperseed with its 2.0～4.0 times of volume of ethanol and washing once, after the drying operation, can obtain single-phase pseudo-boehmite;
4. operation repeated above-mentioned sodium aluminate solution hydro-thermal decomposition of crystal seed step subsequently as crystal seed before the degradation production in the step 1 also can turn back to.
The present invention compares with the technology of preparing of existing pseudo-boehmite, has following major advantage:
1. the SB powder crystal kind of present method employing has very high activity, this crystal seed hydrothermal decomposition sodium aluminate solution is efficient, economical, can obtain higher solution rate of decomposition at very low seed ratio (SR=1.0) with in the resolving time (3h), rate of decomposition reaches as high as more than 30%;
2. the SB powder hydrothermal decomposition sodium aluminate solution that provides of present method prepares the method for pseudo-boehmite not only technology is simple, mild condition, crystal seed can recycle repeatedly continuously, and the pore volume of product is big, specific surface is high, part character even surpassed the technical indicator of SB powder has shown that it is at the potential application foreground of industries such as petrochemical complex as support of the catalyst and sorbent material;
3. in present method behind the SB powder hydrothermal decomposition sodium aluminate solution, before decomposing, greatly improves the pH that decomposes filtrate.After combining with the process of alkaline process production metallurgy grade aluminum oxide such as Bayer process, this decomposition filtrate can turn back to the in addition recycle of stripping stage that alkaline process is produced bauxite in the alumina process.
In a word, present method has broken through the traditional processing technology of pseudo-boehmite, has shortened technical process greatly, has reduced production cost, is expected to develop into the traditional high added value pseudo-boehmite and the γ-Al that comprise the aluminium alcoholates hydrolysis method
2O
3The compensation process of technology of preparing.
Description of drawings
Fig. 1 is the XRD figure spectrum of embodiment 1～embodiment 4 degradation productions and SB powder.
Embodiment
The present invention is to provide a kind of is crystal seed with the SB powder, and the hydrothermal decomposition sodium aluminate solution prepares the method for large pore volume, high-ratio surface pseudo-boehmite, and concrete steps comprise:
With the SB powder as original crystal seed, join in the sodium aluminate solution and decompose, Al in the add-on of kind and the solution
2O
3Mass ratio be 1: 1, decompose down at airtight hydrothermal condition (100～150 ℃ of temperature of reaction, 3～16 hours reaction times) subsequently, degradation production.Operation, reduced production costs to reduce the consumption of SB powder crystal kind as crystal seed before this degradation production also can turn back to.The specific surface area of original crystal seed and pore volume size are respectively 227.2m
2/ g and 0.40cm
3About/g.
The control of above-mentioned decomposition condition is very crucial.
Should control the Al in the sodium aluminate solution
2O
3Concentration is at 110～200g/L-Al
2O
3And the causticization coefficient is between 1.30～1.75, guaranteeing higher sodium aluminate solution rate of decomposition, and reduces subsequent technique and removes Na
+Difficulty.If the Al in the solution
2O
3Concentration is 200g/L, and then the causticization coefficient of solution should be 1.30; If the Al in the solution
2O
3Concentration is 110g/L, and then the causticization coefficient of solution should be 1.75.If the Al in the solution
2O
3When concentration was between the 110g/L to 200g/L, then the causticization coefficient of solution also should be between 1.75 to 1.30.In a word, the Al in the selection sodium aluminate solution
2O
3Concentration should become negative correlativing relation with the causticization coefficient.
During SB powder decomposition sodium aluminate liquid,, the aluminium in the solution is separated out with the pseudo-boehmite form of large pore volume, high-ratio surface by controlling the resolving time under the different hydrothermal decomposition temperature.The time of 100 ℃ of following sodium aluminate solution hydrothermal decomposition is no less than 16h, and the time of 125 ℃ of following sodium aluminate solution hydrothermal decomposition is no less than 3h.And the temperature of decomposition sodium aluminate liquid is in 100 ℃ between 125 ℃ the time, and the time of corresponding hydrothermal decomposition also should be between the 16h to 3h.In a word, the hydrothermal decomposition temperature of selection and hydrothermal decomposition should become negative correlativing relation between the time.
2. degradation production is washed with water to neutrality behind cooling, vacuum filtration, gets neutral filter cake.
3. neutral filter cake is disperseed with its 2.0～4.0 times of volume of ethanol and washing once, at 100～120 ℃ of common dry 10～12h down, can obtain specific surface area is 176.8～213.6m subsequently
2/ g and pore volume size are 0.59～0.86cm
3The single-phase pseudo-boehmite of/g.
In this step, with the neutral filter cake of washing with alcohol, mainly be for can eliminate effectively washed product in follow-up drying process because of being rich in the hard aggregation that hygroscopic water occurs, cause the pore volume and the specific surface decline of degradation production.
The invention will be further described below in conjunction with several specific embodiments.
Embodiment 1: a certain amount of SB powder is joined contain 140g/L-Al
2O
3, the causticization factor alpha
KBe in 1.30 the 40ml sodium aluminate solution, Al in the add-on of SB powder and the sodium aluminate solution
2O
3Weight ratio be 1: 1,125 ℃ of following continuous hydrothermal decomposition 3h, rate of decomposition is 31.7%; Degradation production through cooling, vacuum filtration, deionized water wash to neutrality, disperse and washing with 2 times of ethanol to solid volume, filter cake is behind dry 12h under 100 ℃, it is 100% pseudo-boehmite that desciccate detects through XRD, and its specific surface area and the pore volume size that adopt full-automatic specific surface and lacunarity analysis instrument to measure are respectively 176.8m
2/ g and 0.59cm
3/ g.
Embodiment 2: a certain amount of SB powder is joined contain 110g/L-Al
2O
3, the causticization factor alpha
KBe in 1.75 the 40ml sodium aluminate solution, Al in the add-on of SB powder and the sodium aluminate solution
2O
3Weight ratio be 1: 1,100 ℃ of following continuous hydrothermal decomposition 16h, rate of decomposition is 16.2%; Degradation production through cooling, vacuum filtration, deionized water wash to neutrality, disperse and washing with 4 times of ethanol to solid volume, filter cake is behind dry 10h under 120 ℃, it is 100% pseudo-boehmite that desciccate detects through XRD, and its specific surface and the pore volume size that adopt full-automatic specific surface and lacunarity analysis instrument to measure are respectively 195.2m
2/ g and 0.86cm
3/ g.
Embodiment 3: a certain amount of SB powder is joined contain 200g/L-Al
2O
3, the causticization factor alpha
KBe in 1.30 the 40ml sodium aluminate solution, Al in the add-on of SB powder and the sodium aluminate solution
2O
3Weight ratio be 1: 1,150 ℃ of following continuous hydrothermal decomposition 9h, rate of decomposition is 23.1%; Degradation production through cooling, vacuum filtration, deionized water wash to neutrality, disperse and washing with 2 times of ethanol to solid volume, filter cake is behind dry 11h under 110 ℃, it is 100% pseudo-boehmite that desciccate detects through XRD, and its specific surface and the pore volume size that adopt full-automatic specific surface and lacunarity analysis instrument to measure are respectively 181.3m
2/ g and 0.78cm
3/ g.
Embodiment 4: a certain amount of SB powder is joined contain 140g/L-Al
2O
3, the causticization factor alpha
KBe in 1.45 the 40ml sodium aluminate solution, Al in the add-on of SB powder and the sodium aluminate solution
2O
3Weight ratio be 1: 1,125 ℃ of following continuous hydrothermal decomposition 3h, rate of decomposition is 22.1%; Degradation production through cooling, vacuum filtration, deionized water wash to neutrality, disperse and washing with 3 times of ethanol to solid volume, filter cake is at 100 ℃ down behind the dry 12h, and it is 100% pseudo-boehmite that desciccate detects through XRD, and its specific surface and pore volume are respectively 182.5m
2/ g and 0.64cm
3/ g.Take the step identical with aforesaid method, the degradation production that once decomposes experiment before the crystal seed that each recirculated water thermolysis sodium aluminate solution experiment is adopted is, after the continuous hydrothermal decomposition 3 times, rate of decomposition is 21.8%, it is 100% pseudo-boehmite that desciccate detects through XRD, and its specific surface and pore volume are respectively 213.6m
2/ g and 0.84cm
3/ g.
Claims (6)
1. the preparation method of a large pore volume, high-ratio surface pseudo-boehmite, it is characterized in that a kind of is crystal seed with the SB powder, and the hydrothermal decomposition sodium aluminate solution prepares the method for large pore volume, high-ratio surface pseudo-boehmite, and concrete steps comprise:
1) with the SB powder as crystal seed, join and contain 110～200g/L-Al
2O
3With the causticization coefficient is to decompose Al in the add-on of crystal seed and the solution in 1.30～1.75 the sodium aluminate solution
2O
3Mass ratio be 1: 1, under airtight hydrothermal condition, decompose subsequently, degradation production;
2) degradation production is washed with water to neutrality behind cooling, vacuum filtration, gets neutral filter cake;
3) neutral filter cake is disperseed with its 2.0～4.0 times of volume of ethanol and washing once, after the drying operation, can obtain single-phase pseudo-boehmite.
2. the preparation method of large pore volume according to claim 1, high-ratio surface pseudo-boehmite is characterized in that described original crystal seed is the SB powder, and its specific surface area and pore volume size are respectively 227.2m
2/ g and 0.40cm
3About/g.
3. the preparation method of large pore volume according to claim 1, high-ratio surface pseudo-boehmite is characterized in that described airtight hydrothermal condition, and its processing parameter is: 100～150 ℃ of temperature of reaction, 3～16 hours reaction times.
4. the preparation method of large pore volume according to claim 1, high-ratio surface pseudo-boehmite is characterized in that described drying process, and its processing parameter is: bake out temperature is 100～120 ℃, and drying time is 10～12 hours.
5. the preparation method of large pore volume according to claim 1, high-ratio surface pseudo-boehmite is characterized in that described crystal seed, and its crystal seed can be a SB powder hydrothermal decomposition sodium aluminate solution resulting decomposition product in confined conditions.
6. the preparation method of large pore volume according to claim 1, high-ratio surface pseudo-boehmite is characterized in that described single-phase pseudo-boehmite, and its specific surface area is 176.8～213.6m
2/ g, the pore volume size is 0.59～0.86cm
3/ g.
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| US6174511B1 (en) * | 1997-07-15 | 2001-01-16 | Japan Energy Corporation | Pseudoboehmite powder for catalyst carrier and process for preparing the same |
| CN1091428C (en) * | 1998-10-13 | 2002-09-25 | 中国石油化工集团公司 | Process for preparing artificial diasporite and gamma-alumina |
| CN1286726C (en) * | 2004-06-03 | 2006-11-29 | 山东铝业股份有限公司 | Preparation of pseudo thinolite |
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