CN106902799B - Preparation method of synthetic high-alumina silica gel - Google Patents
Preparation method of synthetic high-alumina silica gel Download PDFInfo
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 title claims abstract description 47
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 title claims abstract description 39
- 239000000741 silica gel Substances 0.000 title claims abstract description 38
- 229910002027 silica gel Inorganic materials 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000003054 catalyst Substances 0.000 claims abstract description 27
- 239000011148 porous material Substances 0.000 claims abstract description 18
- 238000000034 method Methods 0.000 claims abstract description 16
- 230000032683 aging Effects 0.000 claims abstract description 12
- VXAUWWUXCIMFIM-UHFFFAOYSA-M aluminum;oxygen(2-);hydroxide Chemical compound [OH-].[O-2].[Al+3] VXAUWWUXCIMFIM-UHFFFAOYSA-M 0.000 claims abstract description 12
- 229920000877 Melamine resin Polymers 0.000 claims abstract description 11
- JDSHMPZPIAZGSV-UHFFFAOYSA-N melamine Chemical compound NC1=NC(N)=NC(N)=N1 JDSHMPZPIAZGSV-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005299 abrasion Methods 0.000 claims abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 10
- 239000002253 acid Substances 0.000 claims abstract description 8
- 238000002791 soaking Methods 0.000 claims abstract description 6
- 238000005406 washing Methods 0.000 claims abstract description 6
- 239000002002 slurry Substances 0.000 claims abstract description 5
- 229910052782 aluminium Inorganic materials 0.000 claims description 16
- 239000002245 particle Substances 0.000 claims description 14
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 9
- 238000001914 filtration Methods 0.000 claims description 8
- 239000011259 mixed solution Substances 0.000 claims description 7
- 230000003213 activating effect Effects 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 claims description 5
- 238000002156 mixing Methods 0.000 claims description 5
- 229910017604 nitric acid Inorganic materials 0.000 claims description 5
- 229910052681 coesite Inorganic materials 0.000 claims description 4
- 238000001816 cooling Methods 0.000 claims description 4
- 229910052906 cristobalite Inorganic materials 0.000 claims description 4
- 238000009718 spray deposition Methods 0.000 claims description 4
- 238000001694 spray drying Methods 0.000 claims description 4
- 229910052682 stishovite Inorganic materials 0.000 claims description 4
- 229910052905 tridymite Inorganic materials 0.000 claims description 4
- 230000005484 gravity Effects 0.000 claims description 3
- 238000007873 sieving Methods 0.000 claims description 2
- 238000010304 firing Methods 0.000 claims 2
- 238000010189 synthetic method Methods 0.000 claims 1
- 239000000499 gel Substances 0.000 abstract description 15
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 abstract description 8
- 239000002994 raw material Substances 0.000 abstract description 8
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 239000004115 Sodium Silicate Substances 0.000 abstract description 4
- 230000000694 effects Effects 0.000 abstract description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052911 sodium silicate Inorganic materials 0.000 abstract description 4
- 230000002194 synthesizing effect Effects 0.000 abstract description 2
- 230000003197 catalytic effect Effects 0.000 description 9
- 238000001035 drying Methods 0.000 description 5
- 239000000243 solution Substances 0.000 description 5
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 4
- 239000004202 carbamide Substances 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 238000004537 pulping Methods 0.000 description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 description 3
- 239000004005 microsphere Substances 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 2
- 239000006227 byproduct Substances 0.000 description 2
- 238000006555 catalytic reaction Methods 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical compound O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000011240 wet gel Substances 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- WNROFYMDJYEPJX-UHFFFAOYSA-K aluminium hydroxide Chemical compound [OH-].[OH-].[OH-].[Al+3] WNROFYMDJYEPJX-UHFFFAOYSA-K 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 238000007036 catalytic synthesis reaction Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000006185 dispersion Substances 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000009775 high-speed stirring Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000013067 intermediate product Substances 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000376 reactant Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000001308 synthesis method Methods 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J21/00—Catalysts comprising the elements, oxides, or hydroxides of magnesium, boron, aluminium, carbon, silicon, titanium, zirconium, or hafnium
- B01J21/12—Silica and alumina
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/40—Catalysts, in general, characterised by their form or physical properties characterised by dimensions, e.g. grain size
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/61—Surface area
- B01J35/615—100-500 m2/g
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/633—Pore volume less than 0.5 ml/g
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/63—Pore volume
- B01J35/635—0.5-1.0 ml/g
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07D—HETEROCYCLIC COMPOUNDS
- C07D251/00—Heterocyclic compounds containing 1,3,5-triazine rings
- C07D251/02—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings
- C07D251/12—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members
- C07D251/26—Heterocyclic compounds containing 1,3,5-triazine rings not condensed with other rings having three double bonds between ring members or between ring members and non-ring members with only hetero atoms directly attached to ring carbon atoms
- C07D251/40—Nitrogen atoms
- C07D251/54—Three nitrogen atoms
- C07D251/56—Preparation of melamine
- C07D251/60—Preparation of melamine from urea or from carbon dioxide and ammonia
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- Chemical & Material Sciences (AREA)
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- Engineering & Computer Science (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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Abstract
The invention provides a preparation method of a high-alumina catalyst for synthesizing melamine, in particular to a preparation method of high-alumina silica gel with higher specific surface area, pore volume, strength and low abrasion rate. The method takes sodium silicate, sulfuric acid and pseudo-boehmite as main production raw materials, wherein the sodium silicate and the sulfuric acid are subjected to aging chambering and acid soaking water washing after being gelatinized, so that the higher specific surface area and pore volume and pore diameter of the catalyst are ensured, and the activity of the catalyst is effectively improved. High-quality pseudo-boehmite is added into the pulped silica gel slurry, so that the content of active alumina in the catalyst and the strength of the catalyst are effectively improved. The invention can produce high-quality silica-alumina gel which is required in industry: the specific surface area is more than or equal to 300m2Per g, pore volume of 0.4-0.7cm3The abrasion rate is less than or equal to 1.5 percent. Solves the key problems of producing the silica-alumina gel which not only has high specific surface area and pore volume, but also has high strength and low abrasion rate. Simple steps, convenient operation and strong practicability.
Description
Technical Field
The invention belongs to the field of preparation of silica-alumina gel, and particularly relates to a preparation method of synthetic high-alumina silica gel.
Background
Melamine is an important organic chemical intermediate product, and is a main raw material for preparing triamine formaldehyde resin with heat resistance, aging resistance, acid and alkali resistance and flame retardance. The industrial production of melamine generally adopts a production process for synthesizing melamine by using urea as a raw material through a normal and low pressure method. The production process adopts a fluidized bed catalytic synthesis process, and requires the catalyst to have the advantages of high strength, high activity, low price and the like. Foreign BASF (BASF) mainly uses γ -Al2O3 as a catalyst, but is expensive. In China, coarse-pore silica gel is mostly used as a catalyst, and the catalyst is low in price, low in catalytic activity and strength and high in consumption. Part of the melamine devices adopt low-aluminum coarse-pore microsphere silica-alumina gel containing about 8 percent of alumina, the catalytic activity and the strength of the low-aluminum coarse-pore microsphere silica-alumina gel are higher than those of silica gel, but the cost of the low-aluminum coarse-pore microsphere silica-alumina gel is 10 percent higher than that of the silica gel due to the addition of raw material aluminum sulfate.
Disclosure of Invention
In order to overcome the defects, the invention provides a preparation method of a melamine high-aluminum catalyst. The catalyst prepared by the method has the advantages of low production cost, high product strength, low abrasion, high activity, high selectivity, few byproducts and the like. The content of the alumina is 25 to 35 percent, and the cost performance is higher.
In order to achieve the purpose, the invention adopts the following technical scheme:
the high-alumina silica gel contains 25-35% of aluminum and has a particle size of 140-300 meshes.
Preferably, the specific surface area of the high-alumina silica gel is more than or equal to 300m2(iv)/g, bulk specific gravity: 0.3 to 0.7t/m3Abrasion: less than or equal to 1.5 percent.
The invention also provides a synthesis method of the high-silicon aluminum adhesive, which comprises the following steps:
aging and reaming silica gel particles, soaking in acid, washing with water to obtain slurry, and filtering to obtain SiO2Wet glue with the content of 8-15%;
mixing peptized pseudo-boehmite with the wet glue, spray drying and forming, roasting, cooling and sieving to obtain the product;
the particle size of the silica gel particles is 1-3 mm.
When the existing silica gel is used as a catalyst carrier, the silica gel is usually immersed in a solution containing a catalytically active component, the solution is absorbed in pores of the silica gel, and the active component is distributed on the surface of the silica gel through procedures such as drying, activation and the like. However, the existing silica sol has too small pore diameter, the load capacity on alumina is too small, the diffusion of reactant molecules is not facilitated, and the large-flow melamine catalytic treatment cannot be met. The follow-up research finds that: when the granularity of the high-alumina silica gel is 140-300 meshes, the aluminum content of the high-alumina silica gel can reach 25% -35%, the full dispersion of catalytic components is ensured, the catalytic efficiency of the silica gel is greatly improved, and the urea bearing capacity can reach 175Kg/T per hour.
In order to realize the balance of the dispersibility of the catalytic components and the catalytic efficiency, the particle size and the aluminum content of the silica sol need to be accurately controlled, and the research of the invention finds that: if the particle size of the silica gel particles is 1-3 mm, SiO in the wet gel after reaming2The content is 8-15%, the aluminum content in the subsequently prepared silica-alumina gel can reach 70%, and the specific surface area is more than or equal to 300m2The catalyst can meet the requirement of high-flow melamine catalysis.
Preferably, the aging treatment conditions are as follows: aging for 1-3 h at 30-70 ℃.
Preferably, the preparation method of the peptized pseudo-boehmite comprises the following steps: adding a proper amount of water into the pseudo-boehmite, adding nitric acid until the mixed solution is colloidal (gelatinized) and the pH value is 2-4, and filtering to obtain the water-soluble aluminum hydroxide.
Preferably, the roasting conditions are as follows: activating for 1-2 h at 300-600 ℃.
More preferably, the roasting conditions are: activating for 1-2 h at 500-550 ℃.
Preferably, the specific surface area of the wet glue is more than or equal to 300m2Per g, pore volume of 0.4-0.7cm3Per g, preferably a pore volume of 0.5cm or more3/g。
The invention also provides a catalyst prepared by the method, the granularity is 140-300 meshes, and the bulk density is as follows: 0.3 to 0.7t/m3Specific surface area: not less than 300m2G, abrasion: less than or equal to 1.5 percent. Content of alumina: 25 to 35 percent.
The method mainly relates to the following aspects:
(1) the sodium silicate and sulfuric acid are used as raw materials, and an air forming process is adopted to prepare the granular silica gel ball, wherein the grain diameter of the silica gel ball is 1-3 mm.
(2) Aging the silica gel particles for 1-3 h under the condition of 30-70 ℃, expanding pores, then carrying out acid soaking and water washing until the conductivity is less than 1000 mu s/cm, pulping in a pulping machine, and filtering the pulp to obtain wet gel with the SiO2 content of 8-15% for later use.
(3) Adding a proper amount of water into the pseudo-boehmite, adding nitric acid until the mixed solution is colloidal (gelatinized), and filtering after the pH value is 2-4 to obtain the alumina sol.
(4) And mixing the aluminum sol and the silica gel slurry, adjusting the pH of the mixed solution to 6-6.5, and performing spray drying and forming in a spray dryer.
(5) And further drying and activating the formed silica-alumina gel for 1-2 hours at the temperature of 300-600 ℃ in a drying and roasting converter, preferably 500-550 ℃ until the loss of ignition is less than or equal to 0.2%.
(6) And cooling the activated silica-alumina gel, and screening by using a screen to obtain the finished catalyst with the required granularity.
The invention also provides the high-alumina silica gel prepared by any one of the methods.
The invention also provides the application of the high-alumina silica gel in the preparation of melamine catalyst.
The invention has the advantages of
(1) The aluminum content of the silica-alumina gel produced by the production method can reach 70 percent, the increase of the aluminum content effectively improves the strength of the catalyst and greatly reduces the abrasion rate, and the abrasion rate of the catalyst produced by tests is less than 1.5 percent
(2) After aging and chambering, the silica alumina gel catalyst prepared by the method has large aperture and specific surface area (see attached drawing), and the macromolecule product melamine molecules can be freely desorbed on the surface of the catalyst during catalytic reaction, thereby effectively improving the catalytic rate. The test shows that when the aluminum content is 25-35%, the catalyst has excellent catalytic activity, and the urea carrying capacity can reach 175Kg/T per hour (the urea carrying capacity of the general commercial catalyst is 150-165 Kg/T). The catalyst has the selectivity of over 99 percent, few byproducts and higher cost performance.
(3) The production process adopts aging hole expansion, acid soaking, water washing and the like, so that sulfate ions introduced by raw materials are effectively removed, and the corrosion of the acid ions to equipment is greatly reduced.
(4) The aluminum source and the raw material pseudo-boehmite in the catalyst are converted into gamma-type active alumina in roasting activation, so that the reaction activity of the catalyst is effectively improved.
(5) The preparation method is simple, strong in practicability and easy to popularize.
Drawings
FIG. 1 shows adsorption and desorption curves;
figure 2 pore size distribution.
Detailed Description
The features of the present invention and other related features are further described in detail below by way of examples to facilitate understanding by those skilled in the art:
example 1
The sodium silicate and sulfuric acid are used as raw materials, and an air forming process is adopted to prepare the granular silica gel ball, wherein the grain diameter of the silica gel ball is 1-3 mm. And (3) aging the formed silica gel particles for 1-3 h at the temperature of 30-70 ℃ for hole expansion. Soaking silica gel particles after reaming with acid, washing with water until the conductivity is less than 1000 mus/cm, pulping in a pulping machine, and filtering the pulp to obtain SiO2And (5) preparing wet glue with the content of 8-15% for later use.
Weighing a certain weight of pseudoboehmite (shown in the following table) and 2Kg of desalted water, mixing, adding 5% of nitric acid under high-speed stirring until the mixed solution is colloidal (gelatinized), and filtering after the pH value is 2-4. And then mixing 20Kg of wet glue slurry with the aluminum glue solution, and adjusting the pH of the mixed solution to 6-6.5 by using 5% nitric acid. Pumping the mixed solution into a spray dryer through a plunger pump for spray drying and forming, and further drying and activating the formed product for 1-2 hours at the temperature of 300-600 ℃ in a drying roasting converter. And cooling the activated silica-alumina gel, and screening by using a screen to obtain the finished catalyst with the required granularity.
The content of aluminum in the silica-alumina gel is adjusted by adjusting the pseudo-boehmite in the embodiment. The physical and chemical indexes of the produced silica-alumina gel correspondingly regulated are shown in a comparative example.
Comparative example
| Sample numbering | Bulk specific gravity g/ml | Particle size | Specific surface m2/g | Pore volume g/ml | Abrasion loss% |
| Example 1 | 625 | 120-200 | 396 | 0.71 | 3.2 |
| Example 2 | 678 | 120-200 | 442 | 0.65 | 2.2 |
| Example 3 | 727 | 120-200 | 487 | 0.6 | 1.45 |
| Example 4 | 769 | 120-200 | 514 | 0.53 | 1.32 |
| Example 5 | 813 | 120-200 | 476 | 0.47 | 1.23 |
| Example 6 | 854 | 120-200 | 407 | 0.41 | 1.14 |
| Example 7 | 897 | 120-200 | 338 | 0.33 | 1.07 |
| Commercially available silica alumina gel | 900-1100 | 180-300 | 150-200 | 0.2-0.4 | 2-4 |
It should be noted that the above-mentioned embodiments are only preferred embodiments of the present invention, and the present invention is not limited thereto, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and equivalents can be made in the technical solutions described in the foregoing embodiments, or equivalents thereof. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention. Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (8)
1. The high-alumina silica gel is characterized in that the content of aluminum in the high-alumina silica gel is 25-35%, and the granularity is 140-300 meshes; the specific surface area of the high-alumina silica gel is more than or equal to 300m2(iv)/g, bulk specific gravity: 0.3 to 0.7t/m3And abrasion rate: less than or equal to 1.5 percent.
2. A synthetic method of high-alumina silica gel is characterized by comprising the following steps: aging and reaming silica gel particles, soaking in acid, washing with water to obtain slurry, and filtering to obtain SiO2Wet glue with the content of 8-15%; mixing peptized pseudo-boehmite with the wet glue, spray drying and forming, roasting, cooling and sieving to obtain the product; the particle size of the silica gel particles is 1-3 mm;
the aging treatment conditions are as follows: aging for 1-3 h at 30-70 ℃;
the preparation method of the peptized pseudo-boehmite comprises the following steps: adding a proper amount of water into the pseudo-boehmite, adding nitric acid until the mixed solution is colloidal, and filtering after the pH value is 2-4.
3. The method of claim 2, wherein the firing conditions are: activating for 1-2 h at 300-600 ℃.
4. The method of claim 3, wherein the firing conditions are: activating for 1-2 h at 500-550 ℃.
5. The method according to claim 2, wherein the wet glue has a specific surface area of 300m or more2Per g, pore volume of 0.4-0.7cm3/g。
6. The method of claim 5, wherein the pore volume is 0.5-0.7cm3/g。
7. An aluminous silica gel prepared by the method of any one of claims 2 to 6.
8. Use of the high alumina silica gel of claim 1 in the preparation of a melamine catalyst.
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| CN113694912A (en) * | 2021-09-16 | 2021-11-26 | 四川金象赛瑞化工股份有限公司 | Catalyst for melamine production and preparation method thereof |
| CN113694911A (en) * | 2021-09-16 | 2021-11-26 | 四川金象赛瑞化工股份有限公司 | Catalyst for synthesizing melamine and preparation method thereof |
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| CN102160996A (en) * | 2010-02-24 | 2011-08-24 | 中国石油化工股份有限公司 | Composition of boehmite and silicon-containing compound and silicon oxide-alumina prepared from same |
| CN102580711A (en) * | 2012-02-01 | 2012-07-18 | 四川金象赛瑞化工股份有限公司 | Production method for synthesizing melamine catalyst by urea with gas phase method |
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