Mixing, pulping, drying and forming device
By mixing and beating in a liquid phase environment and using vacuum belt filtration and flash drying technology, the problem of uniform dispersion of molecular sieves and alumina particles in the traditional mixed beating process is solved, achieving a more uniform dispersion and significantly reducing energy consumption.
Patent Information
- Application Number
- CN202420009260.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-01-02
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-01-02
AI Technical Summary
The traditional mixed beating process is difficult to achieve uniform dispersion of molecular sieves and alumina particles, and the process flow is complex and energy consumption is high.
A mixed beating and drying forming device is designed, including beating assembly, filter assembly, drying assembly, flash assembly and extruder. By mixing molecular sieve and alumina or its precursor in a liquid phase environment, vacuum belt filtration is adopted. Techniques such as hollow blade drying and flash drying towers improve dispersion uniformity and simplify process flow.
It effectively reduces the unorganized emission of dust, improves the dispersion uniformity between molecular sieve and alumina or its precursor, simplifies the process flow, greatly reduces energy consumption, and achieves a higher degree of automation and environmentally friendly production.
Smart Images
Figure CN222174102U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of catalyst preparation, in particular to a mixing, beating, drying and forming device, in particular to a mixing, beating, drying and forming device for molecular sieves and alumina and / or alumina precursors in an aqueous solution. Background Art
[0002] The mixing and beating process is a traditional process in the catalyst preparation industry. The key technology of this process is to make the molecular sieve and alumina mix evenly. Traditional mixing and beating is to add multiple powders into the kneader and mix them by stirring with the stirring blades, but this equipment cannot make the two particles fully and evenly dispersed. In order to solve the above problems, technical personnel in the industry have studied the mixing and beating device.
[0003] CN115945226A discloses a pulping and mixing process, wherein at least one of the slurries to be mixed is formed into a colloidal slurry through a gelling reaction; the colloidal slurry is mixed with other slurries to be mixed to obtain a blended slurry; the blended slurry is subjected to a plurality of cycles of ultrasonic dispersion-colloid mill mixing until the particle size in the blended slurry is monodistributed and the particle size change rate with the cycle treatment is less than 10%. However, the process flow of this method is relatively complicated and the overall energy consumption is relatively high.
[0004] Therefore, there is an urgent need to develop a mixing and beating device that can disperse the mixed slurry evenly, has a simple process flow and low energy consumption. Utility Model Content
[0005] The purpose of the utility model is to overcome the problem that the mechanical mixing method in the prior art is difficult to achieve uniform dispersion of molecular sieve and alumina particles, and to provide a mixing, beating, drying and forming device. The device mixes the molecular sieve with alumina and / or alumina precursor in a liquid environment, thereby improving the uniformity of dispersion, and the device has a simple process flow and greatly reduces energy consumption.
[0006] In order to achieve the above-mentioned purpose, the utility model provides a mixing, beating, drying and forming device, which includes a beating component, a filtering component, a drying component, a flash evaporation component, a kneader and an extruder connected in sequence; the beating component is used to mix and beate molecular sieves, alumina and / or alumina precursors and water to obtain a mixed slurry.
[0007] Through the above technical solution, the utility model has the following beneficial effects:
[0008] (1) The mixing, beating, drying and forming device provided by the utility model mixes the molecular sieve with alumina and / or alumina precursor in a liquid environment, and passes the mixed liquid through a filtering component, a drying component, a flash evaporation component, a kneading machine and an extruder. The mixing, beating, drying and forming device effectively reduces the unorganized emission of dust, and is conducive to making the molecular sieve and alumina and / or alumina precursor dispersed more evenly;
[0009] (2) The mixing, beating, drying and forming device provided by the utility model has mature technology, high degree of automation, is environmentally friendly, simplifies the process flow, and greatly reduces energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS
[0010] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention, but do not constitute a limitation to the present invention.
[0011] Figure 1 It is a schematic diagram of a mixing, beating, drying and forming device according to a specific embodiment of the utility model.
[0012] Description of Reference Numerals
[0013] 1. Beating component 2. Filtering component 3. Drying component
[0014] 4Flash evaporation module 5Kneading machine 6Extruder
[0015] 7 Feed inlet 8 Slurry outlet 9 Discharge outlet
[0016] 10 feeding device 11 hot air furnace 12 crusher DETAILED DESCRIPTION
[0017] The endpoints and any values of the ranges disclosed in this article are not limited to the precise ranges or values, and these ranges or values should be understood to include values close to these ranges or values. For numerical ranges, the endpoint values of each range, the endpoint values of each range and the individual point values, and the individual point values can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this article.
[0018] The utility model provides a mixing, beating, drying and forming device, such as Figure 1 As shown, it includes a pulping component 1, a filtering component 2, a drying component 3, a flashing component 4, a kneading machine 5 and an extruder 6 which are connected in sequence; the pulping component 1 is used to mix and pulp the molecular sieve, alumina and / or alumina precursor and water to obtain a mixed slurry.
[0019] In the utility model, the molecular sieve can be a mordenite molecular sieve.
[0020] In the present invention, the source of the mordenite molecular sieve is not particularly limited and can be purchased from commercial sources or prepared by existing methods.
[0021] In the present invention, the alumina and / or alumina precursor can be various alumina and / or alumina precursors known in the art that can be used for catalyst preparation. Preferably, the alumina and / or alumina precursor is selected from at least one of pseudo-boehmite, boehmite and alumina.
[0022] In the present invention, the sources of the aluminum oxide and / or the aluminum oxide precursor are not particularly limited and can be purchased commercially or prepared by existing methods.
[0023] In the present invention, the mass ratio of the molecular sieve to alumina and / or alumina precursor is 1-4:1, preferably 1.1-3:1.
[0024] In the utility model, the liquid-to-solid mass ratio of the mixed slurry is 1.5-4:1, preferably 1.6-2.5:1. Controlling the liquid-to-solid mass ratio of the mixed slurry within the range is conducive to mixing and beating. The mixing and beating time of the utility model is 14-21min, preferably 15-20min. Controlling the beating time within the range is conducive to subsequent treatment of the obtained mixed slurry.
[0025] In the present invention, the beating component 1 is not particularly limited, as long as it can mix and beat the molecular sieve, alumina and / or alumina precursor and water to obtain a mixed slurry. Preferably, the beating component 1 is a stirring kettle.
[0026] In some embodiments of the utility model, preferably, the beating assembly 1 is provided with a feed inlet 7 at the top and a slurry outlet 8 at the bottom. The beating assembly of the utility model is conducive to mixing molecular sieve, alumina and / or alumina precursor and water for beating to obtain a mixed slurry.
[0027] According to a preferred embodiment of the present invention, the mixing, beating, drying and forming device further comprises a molecular sieve supply unit, an alumina and / or alumina precursor supply unit and a water supply unit connected to the feed port 7 of the stirring tank.
[0028] In some embodiments of the utility model, preferably, the filter assembly 2 is a vacuum belt filter, and the filter assembly 2 is used to vacuum filter the mixed slurry to remove water. The utility model uses a vacuum belt filter to vacuum filter the mixed slurry, and the vacuum filtered water is discharged as wastewater. The material body obtained by vacuum filtration is pushed to the drying assembly 3 by the tail of the vacuum belt filter.
[0029] In some embodiments of the present invention, preferably, the drying component 3 is a hollow paddle dryer, and the drying component 3 is used to preliminarily dry the material after vacuum filtration and water removal. The drying conditions of the hollow paddle dryer of the present invention are not particularly limited, for example, the drying can be performed at a temperature of 100-120°C and a time of 2-3 hours.
[0030] In some embodiments of the utility model, preferably, a discharge port 9 is provided at the bottom of the hollow paddle dryer, and a feeding device 10 is provided at the bottom of the discharge port. The feeding device is a screw conveying device, and the preliminarily dried material is pushed to the flash evaporation component 4 through the screw conveying device.
[0031] In some embodiments of the utility model, preferably, the flash component 4 is a flash drying tower, and the flash component 4 is used to dry and powder the preliminarily dried material to obtain dry powder. The drying and powdering in the flash drying tower of the utility model is conducive to further dehydrating the mixed molecular sieve, alumina and / or alumina precursor, and evenly breaking them up, thereby improving the mixing uniformity of the molecular sieve, alumina and / or alumina precursor. The moisture content of the obtained dry powder meets the dehydration requirements, which is conducive to extrusion molding; the material that is not flash-powdered has lumps and larger particles, which are easy to block the flower plate during extrusion molding, making extrusion difficult.
[0032] In some embodiments of the present invention, preferably, the flash drying tower is provided with a hot air stove 11 and a pulverizer 12, and the hot air of the hot air stove 11 pushes the dry powder to the kneader 5. The present invention uses the hot air stove 11 to further dehydrate and dry the preliminarily dried material, and uses the pulverizer 12 to pulverize the material after being treated by the hot air stove 11, and then the hot air of the hot air blower 11 brings the dry powder out of the flash component 4 and pushes it to the kneader 5.
[0033] In the utility model, the drying conditions of the hot air furnace 11 are not particularly limited. For example, the drying time can be 2-3 hours at a temperature of 100-120°C. The method and conditions of the powdering are not particularly limited, as long as the proportion of dry powder with a particle size of less than 100 μm in the obtained dry powder is more than 90wt%. For example, the powdering can be carried out in a grinder for 5-10 minutes.
[0034] In some embodiments of the present invention, preferably, the kneading machine 5 is used to knead dry powder, additives, acid solution and water to obtain a plastic body.
[0035] According to a preferred embodiment of the present utility model, the mixing, beating, drying and forming device further comprises an auxiliary agent supply unit, an acid liquid supply unit and a water supply unit which are connected to the kneading machine 5 .
[0036] In the present invention, the auxiliary agent is an active metal auxiliary agent. There is no particular limitation on the type of the active metal. Preferably, the auxiliary agent can be selected from at least one of zinc, cobalt, magnesium and nickel.
[0037] In the present invention, the acid can be any acid known in the art that can be used for catalyst preparation, preferably an inorganic acid, more preferably at least one selected from sulfuric acid, hydrochloric acid and nitric acid. In the present invention, adding an inorganic acid to the obtained dry powder and auxiliary agent for moderate peptization is beneficial to improve the fluidity of the mixture, thereby facilitating kneading and extrusion.
[0038] In some embodiments of the present invention, preferably, the extruder 6 is used to extrude the plastic body.
[0039] In the present invention, the extrusion molding is carried out in an extruder. The conditions of the extrusion molding are not particularly limited, for example, it can be carried out at an extrusion rate of 20-40r / min and a temperature of 30-40°C, which is more conducive to extrusion into strips.
[0040] By adopting the mixed pulping and drying molding device of the utility model, pulping is carried out in the pulping assembly, and the obtained liquid is dried and flash-powdered, which effectively reduces the unorganized emission of dust and is conducive to making the molecular sieve and alumina and / or alumina precursor more evenly dispersed. At the same time, the mixed pulping and drying molding system simplifies the process flow and greatly reduces energy consumption.
[0041] A mixing, beating, drying and forming method based on the above device specifically comprises the following steps:
[0042] (1) adding raw molecular sieves, alumina and / or alumina precursor and water into a stirring tank, mixing and slurrying them under stirring conditions to obtain a mixed slurry;
[0043] (2) The mixed slurry enters a vacuum belt filter through the discharge port of the stirring kettle for vacuum filtration, and then enters a hollow paddle dryer for drying. The dried material is pushed to a flash drying tower through a screw conveyor of the vacuum belt filter, dried in a hot air furnace, and pulverized by a pulverizer to obtain a dry powder;
[0044] (3) The dry powder is pushed to a kneader by hot air from a hot air furnace, and an auxiliary agent, acid solution and water are added for kneading. The plastic body obtained by kneading enters an extruder for extrusion molding.
[0045] The present invention will be described in detail below through embodiments.
[0046] Molecular sieve: mordenite molecular sieve, homemade, industrial grade, silicon-aluminum molar ratio of 32; alumina: purchased from Lanzhou Petrochemical Catalyst Plant, industrial grade, solid content 70wt%; pseudo-boehmite: purchased from Lanzhou Petrochemical Catalyst Plant, industrial grade, solid content 70wt%.
[0047] Example 1
[0048] 1000 kg of pure water was added to the stirring kettle for stirring. While stirring, 320 kg of mordenite molecular sieve and 280 kg of alumina were added in sequence from the feed port of the stirring kettle. Stirring was continued for 15 min. The obtained mixed slurry entered the vacuum belt filter through the discharge port of the stirring kettle for vacuum filtration, and then entered the hollow paddle dryer for drying at 100° C. for 3 h. The dried material was pushed to a flash drying tower through the screw conveyor of the vacuum belt filter, and then dried in a hot air furnace at 110° C. for 2 h. The powder was pulverized by a pulverizer for 6 min to obtain dry powder. The dry powder was pushed to a kneader by hot air from the hot air furnace, and the dry powder, 24 kg of zinc nitrate, 36 kg of nitric acid solution (concentration of 65 wt%) and water were kneaded. The plastic obtained by kneading entered an extruder for extrusion molding to obtain catalyst 1.
[0049] Among them, the mixing, beating, drying and forming device is as follows Figure 1 shown.
[0050] Comparative Example 1
[0051] The method of Example 1 is followed, except that the flash evaporation component (4) is not provided; and catalyst 2 is obtained.
[0052] Test Case
[0053] The uniformity of the mixture of molecular sieve and alumina and / or alumina precursor in the catalyst prepared by the mixed pulping and drying molding method of the device described in the utility model was evaluated. The specific test method included: randomly taking 4 samples from 4 different positions in 200 kg of dry powder per ton bag, and then conducting ICP tests respectively, and taking the average value as the silicon-aluminum molar ratio of 1; then randomly taking 4 samples from 4 different positions for testing, and taking the average value as the silicon-aluminum molar ratio of 2; the sampling and testing methods for silicon-aluminum molar ratios 3 and 4 are similar; comparative example 1 was not flash-powdered, and the material obtained after drying was tested for silicon-aluminum molar ratio, and the sampling and testing method was the same as above. The test results are shown in Table 1.
[0054] Table 1
[0055] serial number Silicon to aluminum molar ratio 1 Silicon to aluminum molar ratio 2 Silicon to aluminum molar ratio 3 Silicon to aluminum molar ratio 4 Example 1 23.5 23.8 23.2 23.4 Comparative Example 1 26.3 25.4 22.7 27.8
[0056] It can be seen from the results in Table 1 that, by using the mixing, beating, drying and molding device provided by the utility model, the molecular sieve is mixed with alumina and / or an alumina precursor in a liquid phase environment, and then the obtained mixed liquid is sequentially passed through a filtering component, a drying component, a flash evaporation component, a kneader and an extruder. Compared with a traditional mechanical mixing device, the mixing, beating, drying and molding device is conducive to making the molecular sieve and alumina and / or an alumina precursor more evenly dispersed, simplifies the process flow, and greatly reduces energy consumption.
[0057] Combining Example 1 of the present invention, Comparative Example 1 and Table 1, it can be seen that compared with Example 1, Comparative Example 1 cannot evenly disperse the molecular sieve and alumina and / or alumina precursor because no flash evaporation component is provided.
[0058] The preferred embodiments of the present invention are described in detail above, but the present invention is not limited thereto. Within the technical concept of the present invention, the technical solution of the present invention can be subjected to a variety of simple modifications, including combining various technical features in any other suitable manner, and these simple modifications and combinations should also be regarded as the contents disclosed by the present invention and belong to the protection scope of the present invention.
Claims
1. A mixing, beating, drying and forming device, characterized in that: The invention comprises a pulping component (1), a filtering component (2), a drying component (3), a flash evaporation component (4), a kneading machine (5) and an extruder (6) which are connected in sequence; the pulping component (1) is used to mix and pulp the molecular sieve, alumina and / or alumina precursor and water to obtain a mixed slurry.
2. The mixing, beating, drying and forming device according to claim 1, characterized in that: The beating component (1) is a stirring kettle.
3. The mixing, beating, drying and forming device according to claim 1 or 2, characterized in that: The beating assembly (1) is provided with a feed inlet (7) at the top and a slurry outlet (8) at the bottom.
4. The mixing, beating, drying and forming device according to claim 1, characterized in that: The filtering component (2) is a vacuum belt filter, and the filtering component (2) is used to perform vacuum filtration on the mixed slurry to remove water.
5. The mixing, beating, drying and forming device according to claim 1, characterized in that: The drying component (3) is a hollow blade dryer, and the drying component (3) is used to perform preliminary drying on the material after water is removed by vacuum filtration.
6. The mixing, beating, drying and forming device according to claim 5, characterized in that: The hollow paddle dryer is provided with a discharge port (9) at the bottom, and a feeding device (10) is provided at the bottom of the discharge port. The feeding device is a screw conveying device, and the preliminarily dried material is pushed to the flash evaporation assembly (4) through the screw conveying device.
7. The mixing, beating, drying and forming device according to claim 1, characterized in that: The flash component (4) is a flash drying tower, and the flash component (4) is used to dry and pulverize the preliminarily dried material to obtain dry powder.
8. The mixing, beating, drying and forming device according to claim 7, characterized in that: The flash drying tower is provided with a hot air stove (11) and a pulverizer (12), and the hot air from the hot air stove (11) pushes the dry powder to the kneading machine (5).
9. The mixing, beating, drying and forming device according to claim 1, characterized in that: The kneading machine (5) is used to knead the dry powder with the auxiliary agent and the acid solution to obtain a plastic body.
10. The mixing, beating, drying and forming device according to claim 9, characterized in that: The extruder (6) is used to extrude the plastic body into strips.