CN104549550B - A kind of method for preparing microsphere FCC catalyst - Google Patents
A kind of method for preparing microsphere FCC catalyst Download PDFInfo
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- CN104549550B CN104549550B CN201310516059.1A CN201310516059A CN104549550B CN 104549550 B CN104549550 B CN 104549550B CN 201310516059 A CN201310516059 A CN 201310516059A CN 104549550 B CN104549550 B CN 104549550B
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Abstract
The invention provides a kind of method for preparing microsphere FCC catalyst, wherein, the method includes：By molecular sieve, clay, boehmite and acid beating, catalyst slurry is obtained；The catalyst slurry is spray-dried, is sprayed by nozzle in spray-drying process, be then dried, the nozzle is included：Nozzle body with cavity, is provided with nozzle entrance, spray orifice on the nozzle body；Wherein, the roof in the cavity of the nozzle body has been downwardly projected conducting element, and the space between the inner surface of the outer surface of the conducting element and the cavity forms rotating room.The nozzle that the present invention is provided is used for when being spray-dried that atomizing effect to be good, when using it for spray drying and preparing FCC catalyst, prepared FCC catalyst good sphericity.The FCC catalyst of good sphericity can be prepared using the method for the present invention.
Description
Technical field
The present invention relates to a kind of method for preparing microsphere FCC catalyst.
Background technology
Closely, but FCC catalyst granule has all been not for basis of microscopic observation FCC catalyst granule profile and spheroid
There is larger difference in whole spheroid, its pattern.FCC catalyst sphericity refers to the shape between FCC catalyst granule and spheroid
Similarity degree.Sphericity is an important physical property of FCC catalyst.The sphericity of FCC catalyst not only affects the stream of catalyst
Change performance, and it is closely related with the anti-wear performance of catalyst.The catalyst of sphericity difference easily weares and teares in use.Mill
Damage produce fine powder run damage, not only can dose consumption also pollute the environment；It is right that the fine powder that catalyst abrasion is produced in addition is likely to
The equipment such as follow-up cigarette machine are impacted, unfavorable to the long-term operation of catalytic cracking unit.
CN1160436C discloses a kind of catalytic cracking catalyst preparation method, and which is with the viscosity of catalyst slurry as control
The addition of mineral acid when index is to adjust boehmite acidifying, the method can be avoided because of the ripple of boehmite acid consumption
The dynamic fluctuation for causing catalyst strength and pore volume, but Jing tests find that the catalyst spherical degree prepared using the method is poor.
Nozzle is the visual plant of the catalyst slurry atomizing effect before determining to be spray-dried.The atomizing effect of nozzle is good,
The then catalyst granules good sphericity of spray drying forming.Wang Xizhong exists《It is spray-dried》（Chemical Industry Press, 2003）
The structure for describing normal pressures formula nozzle of page 80.The FCC catalyst sphericity prepared using normal pressures formula nozzle is bad.
Relatively, but FCC catalyst granule is all not complete ball for basis of microscopic observation FCC catalyst granule profile and spheroid
There is larger difference in body, its pattern, determine existing skill using the particle diameter and morphological analyses instrument CamsizerXT of German Lai Chi companies
FCC catalyst sphericity prepared by art only has 0.91 or so.
The content of the invention
It is an object of the invention to providing on the basis of existing technology a kind of high sphericity FCC catalyst can be prepared
Method, and except remaining property that can improve the spherical catalyst be outside one's consideration, obtain is substantially suitable with state of the art or more
It is high.
To realize object defined above, the invention provides a kind of method for preparing microsphere FCC catalyst, wherein, the method bag
Include：By molecular sieve, clay, boehmite and acid beating, catalyst slurry is obtained；The catalyst slurry is sprayed
It is dried, is sprayed by nozzle in spray-drying process, be then dried, the nozzle includes：Nozzle with cavity
Main body, is provided with nozzle entrance, spray orifice on the nozzle body；Wherein, the roof in the cavity of the nozzle body is dashed forward downwards
Go out to have conducting element, the space between the inner surface of the outer surface of the conducting element and the cavity forms rotating room.
The conducting element of the nozzle design of the present invention has rectified action to the fluid into rotating room, it is ensured that rotating room
Fluid makees the rotational flow of rule in rotating room, is not in flowing at random, substantially increases the atomizing effect of nozzle；Simultaneously
In a preferred embodiment of the invention, horn mouth is formed with by the outlet in spray orifice, the ring for spraying can be protected from nozzle
Interference of the shape liquid film from surrounding air, it is ensured that annular liquid film forms little droplet evenly when thinning atomization is expanded, and carries
High atomizing effect.
When the nozzle that the present invention is provided is used to be spray-dried, atomizing effect is good, uses it for being spray-dried preparation FCC catalysis
During agent, prepared FCC catalyst good sphericity.The FCC catalyst of good sphericity can be prepared using the method for the present invention.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Description of the drawings
Accompanying drawing is, for providing a further understanding of the present invention, and to constitute the part of description, with following tool
Body embodiment is used for explaining the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 is the sectional view of the nozzle according to one embodiment of the present invention；
Fig. 2 is the top view of the nozzle with 2 nozzle entrances according to one embodiment of the present invention；
Fig. 3 is the top view of the nozzle with 6 nozzle entrances according to one embodiment of the present invention.
Specific embodiment
Hereinafter the specific embodiment of the present invention is described in detail.It should be appreciated that described herein concrete
Embodiment is merely to illustrate and explains the present invention, is not limited to the present invention.
The invention provides a kind of method for preparing microsphere FCC catalyst, wherein, the method includes：By molecular sieve, glue
Soil, boehmite and acid beating, obtain catalyst slurry；The catalyst slurry is spray-dried, is spray-dried
During sprayed by nozzle, be then dried, as shown in figure 1, the nozzle includes：Nozzle master with cavity
Body, is provided with nozzle entrance 1, spray orifice 4 on the nozzle body；Wherein, the roof in the cavity of the nozzle body is dashed forward downwards
Go out to have conducting element 3, the space between the inner surface of the outer surface of the conducting element 3 and the cavity forms rotating room 2.
In the present invention, in the case where contrary explanation is not made, be related to the description of nozzle, the noun of locality for using as " it is upper and lower,
Left and right, top, bottom " typically refers to upper and lower, left and right shown in refer to the attached drawing, top, bottom；" inside and outside " is referred to relative to each part sheet
The profile of body it is inside and outside.
The method according to the invention, in order to further improve the atomizing effect of nozzle, preferably in vertical direction, the water conservancy diversion
1/10-4/5 of the distance on the bottom of part 3 and the top of spray orifice 4 for cavity height；More preferably in vertical direction, the conducting element 3
Bottom and spray orifice 4 top distance for cavity height 1/5-1/3.
The method according to the invention, in order to further improve the atomizing effect of nozzle, the outer surface of the preferred conducting element 3
With the distance between the inner surface of the cavity for cavity diameter 1/10-2/5.
In the present invention, it is related to the description of the part of nozzle, if no special instructions, internal diameter refers to interior diameter, what external diameter referred to
It is overall diameter, footpath refers to diameter.
In the present invention, the distance between the outer surface of the conducting element 3 and inner surface of the cavity are referred to same
On horizontal line, the distance between point point corresponding with the inner surface of cavity of the outer surface of conducting element 3, preferred conducting element 3
Each point of outer surface is equal with the distance between each corresponding point of the inner surface of cavity.
In order to further improve the atomizing effect of nozzle, one kind of the invention is preferred embodiment, preferably described
Conducting element 3 includes the cylinder being connected and cone, wherein, one end of cylinder is connected to the roof of cavity, wherein, it is connected
Connect and refer to one end of cylinder and engage with the bottom surface of cone, the height ratio of more preferably described cylinder and cone is 0.5-
3:1, preferably 1.5-2:1.
It is of the invention it is a kind of preferred embodiment, the preferred at least partially cylinder of the cavity, the spray
Mouth entrance 1 is communicated with rotating room 2 in tangential direction, so that the nozzle with conducting element has more preferable rectification effect, from
And the atomizing effect of the nozzle of the present invention can be improved.
In the present invention, the nozzle entrance 1 is communicated with rotating room 2 in tangential direction and refers to the nozzle entrance 1 along cutting
It is circular tangent with rotating room 2 to direction.
The method according to the invention, the set location of the spray orifice 4 can be selected according to actual needs, specifically can be with
It is configured according to prior art, for the present invention, the preferably spray orifice 4 is arranged on the bottom of the nozzle body.
The shape of the nozzle body is not particularly limited in the present invention, specifically can be selected according to actual needs
Select, preferred embodiment, preferably the nozzle body includes cylinder and the cone being connected to one kind of the invention,
Roof of the one end of cylinder for nozzle body, wherein, connection is referred to one end of cylinder and is engaged with the bottom surface of cone, more
It is preferred that the height ratio of the cylinder and cone of the nozzle body is 0.5-3:1, preferably 0.6-1:1.
Preferred embodiment, the cavity of the preferably nozzle body includes the cylinder being connected to one kind of the invention
Chamber and conical cavity.
Preferred embodiment, preferably the nozzle body includes cylinder and the circle being connected to one kind of the invention
Cone, the preferably cylindrical cavity are located in the cylinder body, and the conical cavity is located in the circular cone body, more preferably described cylinder
The height ratio of chamber and conical cavity is 0.5-3:1, preferably 0.6-1:1.
In the present invention, the cone and cylinder of the nozzle body can be made of one, it is also possible to make respectively, use
When fit together use.
The method according to the invention, as shown in Figure 1 when the nozzle body includes the cylinder and the cone that are connected,
It is preferred that the spray orifice 4 is formed at the vertex of a cone of the cone of the nozzle body and is connected with the conical cavity.
The method according to the invention, as shown in Figure 1 when the nozzle body includes the cylinder and the cone that are connected,
The nozzle entrance（1）It is arranged on the cylinder of nozzle body and is connected with the cylindrical cavity in tangential direction.It is concrete that position is set
Put can according to it needs to be determined that, the present invention to this without particular/special requirement.
Preferred embodiment, preferably the conducting element 3 includes the circle being connected to one kind of the invention as previously mentioned
Cylinder and cone, the nozzle body include the cylinder being connected and cone, and the cavity of the nozzle body includes phase
The cylindrical cavity and conical cavity of connection, wherein, the cone angle of the cone of the preferred nozzle body, the conducting element（3）Circular cone
The cone angle of body can be each 20 ° -150 ° with the cone angle of the conical cavity, the cone of the cone of more preferably described nozzle body
Angle, the conducting element（3）Cone cone angle it is equal with the cone angle of the conical cavity.
With the method for the invention it is preferred to the diameter of the nozzle entrance 1, the diameter of spray orifice 4 are straight with the cylindrical cavity
The ratio in footpath is 1-8:1-10:20-40.
With the method for the invention it is preferred to the nozzle also includes the part 5 with loudspeaker opening, the loudspeaker of the part 5
Opening is communicated with the spray orifice 4.
Communicated with the spray orifice 4 by making the loudspeaker opening of the part 5 so that be formed with loudspeaker in the outlet of spray orifice
Mouthful, can protect from nozzle spray annular liquid film from surrounding air interference, it is ensured that annular liquid film expand change mist
Little droplet evenly is formed during change, atomizing effect is improve.
The part 5 for meeting aforementioned claim may be incorporated for the present invention, and which can be various ways, for example, can be with loudspeaker
Opening truncated cone-shaped part, or while with loudspeaker opening and with the cavity of nozzle body size fit
Protective cover（As shown in Figure 1）, during use by shielding cover on nozzle body, then its loudspeaker opening is communicated i.e. with spray orifice
Can, wherein, and along towards the direction on the outside of spray orifice, the internal diameter of the loudspeaker opening gradually increases.
For the present invention, the preferred bus of loudspeaker opening and the angle of horizontal direction are 10-60 °（It is β angles in Fig. 1）.
For the height of preferably loudspeaker opening of the invention（Or claim depth）For 1/10-2 times of cavity height, more preferably loudspeaker
The height of opening（Or claim depth）For 1/5-2/3 times of cavity height.
For the present invention, 2-20 times for injection diameter of the maximum gauge of preferred loudspeaker opening, more preferably 5-10 times, loudspeaker
1-2 times for injection diameter of the minimum diameter of opening.
The method according to the invention, the number of the nozzle entrance 1 can be selected according to needs, generally 1-10
It is individual.The top view of the nozzle with 2 nozzle entrances that Fig. 2 is provided for the present invention, Fig. 3 are sprayed with 6 for what the present invention was provided
The top view of the nozzle of mouth entrance.
It is of the invention it is a kind of preferred embodiment, a diameter of 1-8mm of the nozzle entrance, the length of nozzle entrance
Degree and diameter ratio are 0.5-5.0；The cavity diameter of nozzle body is 10-40mm；Spray orifice with diameter greater than equal to nozzle entrance
Diameter, a diameter of 2-10mm of spray orifice, the height of spray orifice is 1-8mm；Conducting element includes the cylinder being connected and cone, institute
Cylinder and cone that nozzle body includes being connected are stated, the cavity includes the cylindrical cavity being connected and conical cavity, described
The cone angle of the cone of nozzle body, the cone of the conducting element cone angle it is equal with the cone angle of the conical cavity.
The height of the shell portion of nozzle body is 1.5-15mm, the height 3-15mm of the cone section of nozzle body；Lead
The diameter with diameter greater than spray orifice of the shell portion of stream part, a diameter of 8-30mm of shell portion, the shell portion of conducting element
Height is highly equal with the shell portion of nozzle body, and the height of the cone section of conducting element is less than the cone of nozzle body
The height of section, the height of the cone section of conducting element is 1-10mm；The internal diameter of the shell portion of conducting element is 2-20mm.
The method according to the invention, in order to further improve sphericity, before being preferably spray-dried, controls catalyst slurry
The viscosity of liquid is 10000-50000 centipoises.
The method according to the invention, in order to further improve sphericity, inlet temperature 400-500 of preferably spray drying
℃。
In the present invention, to the outlet temperature that is spray-dried without particular/special requirement, can be the conventional selection of this area, for example may be used
Think 100-200 DEG C.
The method according to the invention, the viscosity of catalyst slurry can be adjusted by various tune adhering methods, in order to subtract
Few operation and as far as possible reduction affect remaining factor of the property of catalyst slurry, preferably in pulping process, by adjusting
Section boehmite and sour addition, the solid content of regulation catalyst slurry are to control catalyst slurry as target viscosities.This
It is well known to those skilled in the art, is not described here in detail.
In the present invention, the consumption of each raw material can be based entirely on and be actually needed determination, and the present invention is to which without special
Limit.With the method for the invention it is preferred in terms of the dry weight of catalyst slurry, contain molecular sieve 10- in the catalyst slurry
55 weight %, aluminium oxide 10-40 weight %, clay 15-65 weight %.
In the present invention, to the solid content of catalyst slurry without particular/special requirement, can be the conventional selection of this area, for example may be used
Think 20-50 weight %.
In the present invention, the addition sequence of each material also has no particular limits, but for effective control catalyst slurry
Viscosity, improves sphericity, and preferred molecular sieve was added before clay, and boehmite is added after clay.Therefore, for this
Molecular sieve, clay, boehmite and acid are preferably beaten by invention as follows：Molecular sieve is mixed into shape with water
Into molecular sieve pulp, clay mix homogeneously is subsequently adding, is subsequently adding boehmite and sour mix homogeneously, obtains catalyst slurry
Liquid.
The method according to the invention, in order to improve sphericity, preferably described beating is carried out in the presence of Alumina gel, in order to carry
High sphericity, the preferably solid content of the Alumina gel are 10-40 weight %.
The method according to the invention, when Alumina gel is added, in order to improve sphericity, preferably as follows by molecule
Sieve, clay, boehmite and acid are beaten：Molecular sieve, Alumina gel and water are mixed to form into molecular sieve pulp, Ran Houjia
Enter clay mix homogeneously, be subsequently adding boehmite and sour mix homogeneously, obtain catalyst slurry.
With the method for the invention it is preferred to the molecular sieve be the molecular sieve with FAU structures, with MAZ structures point
One or more in sub- sieve, the molecular sieve with MFI structure, the molecular sieve with BEA structures；Wherein, with FAU structures
Molecular sieve can be one or more in X molecular sieve, Y molecular sieve, SAPO-37 molecular sieves etc.；Molecular sieve with MAZ structures
Can be Omega molecular sieves；Molecular sieve with MFI structure can be ZSM-5 molecular sieve；Molecular sieve with BEA structures can
Think beta-molecular sieve.
For the present invention, preferably the molecular sieve is Y type molecular sieve, ZSM-5 molecular sieve, Omega molecular sieves and beta-molecular sieve
In one or more, more preferably described molecular sieve is Y type molecular sieve and/or ZSM-5 molecular sieve.
The method according to the invention, optional wider range of the species of the clay, clay commonly used in the art are equal
Can be used for the present invention, for the present invention, during preferably the clay is Kaolin, galapectite, meerschaum, tired de- soil and montmorillonite
One or more, the preferably clay is Kaolin.
The method according to the invention, optional wider range of the species of the boehmite are commonly used in the art
Boehmite is used equally to the present invention, and for the present invention, preferably the boehmite is a diaspore, gibbsite and visits
One or more in your stone.
The method according to the invention, optional wider range of the species of the acid, acid commonly used in the art can use
In the present invention, for the present invention, the acid is one or more in hydrochloric acid, nitric acid, phosphoric acid and sulphuric acid.
By the following examples, the present invention is further illustrated, but content not thereby limiting the invention.
In the present invention, sphericity is represented with sphericity index SPHT, refer to the surface area with the spheroid of object same volume
With the ratio of the surface area of object.
Sphericity computing formula is as follows：
Sphericity index SPHT=4 π A2/P2, projected areas of the wherein A for granule, projection girths of the P for granule.
The CamsizerXT dynamic digital imaging particle analysers of Lai Chi companies of Germany are adopted in embodiment and comparative example
The sphericity of test catalytic cracking catalyst.Dry method is determined, and condition determination is：Sample fast forward rate in feed well is advised for instrument
The 60% of fixed maximum vibration speed, it is the 55% of the maximum vibration speed that instrument specifies that sample enters the speed of measurement window,
Sample introduction is 1.2g.
In the present invention, the viscosity of catalyst slurry adopts the model DV-S rotating cylinder viscometer of Bo Lefei companies of U.S. production
Determine, condition determination：Rotating speed 6rpm, 25 DEG C of temperature.
Water droplet pore volume, abrasion index, apparent bulk density（Also referred to as heap ratio）Respectively according to《Petrochemical Engineering Analysis method
(RIPP test methods))) (Yang Cui surely wait compile, Science Press, nineteen ninety publish) in RIPP28-90, RIPP29-90,
RIPP31-90 and RIPP92-90 standard methods are determined.
Embodiment 1
As shown in figure 1,1# nozzles include：With loudspeaker opening and with anti-with the cavity of nozzle body size fit
Shield（As shown in Figure 1）, its loudspeaker opening communicated with spray orifice（The axis of loudspeaker opening is overlapped with the axis of spray orifice, loudspeaker
The height of opening for cavity height 1/5）, the bus of loudspeaker opening is 45 ° with horizontal angle, and the maximum of loudspeaker opening is straight
5 times for injection diameter of footpath, 2 times for injection diameter of minimum diameter；Nozzle body with cavity, the nozzle body include
The cylinder being connected and cone, the cavity include the cylindrical cavity being connected and conical cavity, arrange on the nozzle body
There are 2 equally distributed nozzle entrances（The a diameter of 1.8mm of nozzle entrance, length 3.0mm of nozzle entrance）With 1 spray orifice（Spray
A diameter of 2mm in hole, the height of spray orifice is 3mm）, nozzle entrance communicated with rotating room in tangential direction；Spray orifice is arranged on nozzle
At the vertex of a cone of the cone of main body, the conducting element includes the cylinder being connected and cone, the cone angle of conical cavity, nozzle master
The cone angle of the cone of body is equal with the cone angle of the cone of conducting element, the height of the shell portion of conducting element and the height of cylindrical cavity
Degree is equal to be 6mm, and the height of conical cavity is 6mm, and the height of conducting element cone section is 3mm, the shell portion of conducting element
A diameter of 12mm, the internal diameter of cylindrical cavity is 18mm；
Fig. 2 shows the top view of nozzle；
500 grams of water is added toward reactor, the finely dispersed SOY-2 molecular sieves that concentration is 32 weight % are subsequently adding
（The product of Shandong catalyst plant production, is the USY type molecular sieves containing rare earth, RE2O3Content is 2.0 weight %, similarly hereinafter）Serosity
1094 grams, add 476 grams of Alumina gels（Shandong catalyst plant production product, 21 weight % of alumina content, similarly hereinafter）, stirring 15
Minute, add 513 grams of Kaolin（Kaolin of Suzhou Products, 22 weight % of igloss, similarly hereinafter）, it is beaten 1 hour, adds 242
Gram boehmite（Shandong branch company of Chinese Aluminium Co., Ltd product, 38 weight % of igloss, similarly hereinafter）, stir 0.5 little
When, add the concentrated hydrochloric acid of 26 gram of 37 weight % to be acidified 1 hour, 10800 centipoise of viscosity of analysis of catalyst serosity；
Then catalyst slurry is transported to 1# nozzles by high-pressure pump to be sprayed, is 480 DEG C, exports temperature in inlet temperature
Spend for spray drying forming under conditions of 100 DEG C, scrubbed dry catalyst A, the sphericity of analysis of catalyst A is 0.940,
Remaining physico-chemical parameter such as abrasion index, water droplet method pore volume, heap are than the level that can reach prior art.
Embodiment 2
As shown in figure 1,2# nozzles include：With loudspeaker opening and with anti-with the cavity of nozzle body size fit
Shield（As shown in Figure 1）, its loudspeaker opening communicated with spray orifice（The axis of loudspeaker opening is overlapped with the axis of spray orifice, loudspeaker
The height of opening for cavity height 1/2）, the bus of loudspeaker opening is 60 ° with horizontal angle, and the maximum of loudspeaker opening is straight
8 times for injection diameter of footpath, 1 times for injection diameter of minimum diameter；Nozzle body with cavity, the nozzle body include
The cylinder being connected and cone, the cavity include the cylindrical cavity being connected and conical cavity, arrange on the nozzle body
There are 6 equally distributed nozzle entrances（The a diameter of 2.8mm of nozzle entrance, the length of nozzle entrance is 3.5mm）With 1 spray orifice
（A diameter of 3mm of spray orifice, the height of spray orifice is 4mm）, nozzle entrance communicated with rotating room in tangential direction；Spray orifice is arranged on spray
At the vertex of a cone of the cone of mouth main body, the conducting element includes the cylinder being connected and cone, the cone angle of conical cavity, nozzle
The cone angle of the cone of main body is equal with the cone angle of the cone of conducting element, height and the cylindrical cavity of the shell portion of conducting element
Highly equal to be 6mm, the height of conical cavity is 8mm, and the height of conducting element cone section is 4mm, the shell portion of conducting element
A diameter of 14mm, the internal diameter of cylindrical cavity is 20mm；
Fig. 3 shows the top view of nozzle；
500 grams of water is added toward reactor, the finely dispersed SOY-2 molecular sieves that concentration is 32 weight % are subsequently adding
（The product of Shandong catalyst plant production, is the USY type molecular sieves containing rare earth, and RE2O3 contents are 2.0 weight %, similarly hereinafter）Serosity
1094 grams, add 381 grams of Alumina gels（Shandong catalyst plant production product, 21 weight % of alumina content, similarly hereinafter）, stirring 15
Minute, add 474 grams of Kaolin（Kaolin of Suzhou Products, 22 weight % of igloss, similarly hereinafter）, it is beaten 1 hour, adds 323
Gram boehmite（Shandong branch company of Chinese Aluminium Co., Ltd product, 38 weight % of igloss, similarly hereinafter）, stir 0.5 little
When, add 36 gram 37% of concentrated hydrochloric acid to be acidified 1 hour, 48000 centipoise of viscosity of analysis of catalyst serosity.Then will by high-pressure pump
Catalyst slurry is transported to 2# nozzles, in inlet temperature be 420 DEG C, outlet temperature be 100 DEG C under conditions of spray drying forming,
Scrubbed dry catalyst B, the sphericity of analysis of catalyst B is 0.937, remaining physico-chemical parameter such as abrasion index, water droplet
Method pore volume, heap are than the level that can reach prior art.
Comparative example 1
Method according to embodiment 2 prepares catalyst, and except for the difference that, the nozzle for using is not provided with conducting element, remaining parameter
All same, obtains catalyst M1, and the sphericity of catalyst M1 is 0.918.
Comparative example 2
Method according to embodiment 2 prepares catalyst, and except for the difference that, the nozzle for using is while be not provided with loudspeaker opening
Protective cover and conducting element, remaining parameter all same, obtain catalyst M2, the sphericity of catalyst M2 is 0.915.
The preferred embodiment of the present invention described in detail above, but, the present invention is not limited in above-mentioned embodiment
Detail, the present invention range of the technology design in, various simple variants can be carried out to technical scheme, this
A little simple variants belong to protection scope of the present invention.
It is further to note that each particular technique feature described in above-mentioned specific embodiment, in not lance
In the case of shield, can be combined by any suitable means.
Additionally, combination in any between a variety of embodiments of the present invention, can also be carried out, as long as which is without prejudice to this
The thought of invention, which should equally be considered as content disclosed in this invention.
Claims (20)
1. a kind of method for preparing microsphere FCC catalyst, wherein, the method includes：By molecular sieve, clay, boehmite with
And acid beating, obtain catalyst slurry；The catalyst slurry is spray-dried, is entered by nozzle in spray-drying process
Row spraying, is then dried, and the nozzle includes：Nozzle body with cavity, is provided with nozzle on the nozzle body
Entrance (1), spray orifice (4)；Characterized in that, the roof in the cavity of the nozzle body has been downwardly projected conducting element (3), this is led
Space between the outer surface and the inner surface of the cavity of stream part (3) forms rotating room (2)；
At least partially cylinder of the cavity, the nozzle entrance (1) are communicated with rotating room (2) in tangential direction.
2. method according to claim 1, wherein, in vertical direction, bottom and the spray orifice (4) of the conducting element (3)
1/10-4/5 of the distance on top for cavity height.
3. method according to claim 2, wherein, in vertical direction, bottom and the spray orifice (4) of the conducting element (3)
1/5-1/3 of the distance on top for cavity height.
4. the method according to any one in claim 1-3, wherein, the outer surface and the sky of the conducting element (3)
1/10-2/5 of the distance between the inner surface in chamber for cavity diameter.
5. the method according to any one in claim 1-3, wherein, the conducting element (3) is including the cylinder being connected
Body and cone, wherein, an end of cylinder is connected to the roof of the cavity.
6. method according to claim 5, wherein, the height ratio of the cylinder and cone of the conducting element (3) is
0.5-3:1。
7. the method according to any one in claim 1-3, wherein, the spray orifice (4) is arranged on the nozzle body
Bottom.
8. the method according to any one in claim 1-3, wherein, the nozzle body includes the cylinder being connected
And cone, the cavity includes the cylindrical cavity being connected and conical cavity, and the cylindrical cavity is located in the cylinder body, the circle
Cone chamber is located in the circular cone body, and the height ratio of the cylindrical cavity and conical cavity is 0.5-3:1.
9. method according to claim 8, wherein, the spray orifice (4) is formed in the cone of the cone of the nozzle body
Connect with the conical cavity at top, the nozzle entrance (1) is arranged on the cylinder of the nozzle body and the cylindrical cavity
Connect in tangential direction.
10. method according to claim 8, wherein, the conducting element (3) including the cylinder and cone being connected,
Wherein, one end of cylinder is connected to the roof of cavity；The cone angle of the cone of the nozzle body, the conducting element (3)
The cone angle of cone is equal with the cone angle of the conical cavity.
11. methods according to claim 8, wherein, the diameter of the nozzle entrance (1), the diameter of spray orifice (4) with it is described
The ratio of the diameter of cylindrical cavity is 1-8:1-10:20-40.
12. methods according to claim 9 or 10, wherein, the diameter of the nozzle entrance (1), the diameter of spray orifice (4) with
The ratio of the diameter of the cylindrical cavity is 1-8:1-10:20-40.
13. methods according to any one in claim 1-3, wherein, the nozzle is also included with loudspeaker opening
Part (5), the loudspeaker opening of the part (5) are communicated with the spray orifice (4).
14. methods according to claim 13, wherein, the height of the loudspeaker opening is 1/10-2 times of cavity height,
The bus of loudspeaker opening and the angle of horizontal direction are 10-60 °, and edge is towards the direction on the outside of spray orifice, the loudspeaker opening
Diameter gradually increases.
15. methods according to any one in claim 1-3, wherein, before being spray-dried, control catalyst slurry
Viscosity be 10000-50000 centipoises, and be spray-dried inlet temperature 400-500 DEG C.
16. methods according to any one in claim 1-3, wherein, in terms of the dry weight of catalyst slurry, the catalysis
Contain molecular sieve 10-55 weight %, aluminium oxide 10-40 weight %, clay 15-65 weight % in agent serosity.
17. methods according to any one in claim 1-3, wherein, as follows will be molecular sieve, clay, plan thin
Diaspore and acid are beaten：
Molecular sieve and water are mixed to form into molecular sieve pulp, clay mix homogeneously is subsequently adding, be subsequently adding boehmite and
Sour mix homogeneously, obtains catalyst slurry.
18. methods according to any one in claim 1-3, wherein, the beating is carried out in the presence of Alumina gel, institute
The solid content for stating Alumina gel is 10-40 weight %.
19. methods according to claim 18, wherein, as follows by molecular sieve, Alumina gel, clay, the thin water aluminum of plan
Stone and acid are beaten：
Molecular sieve, Alumina gel and water are mixed to form into molecular sieve pulp, clay mix homogeneously is subsequently adding, the thin water of plan is subsequently adding
Aluminum stone and sour mix homogeneously, obtain catalyst slurry.
20. methods according to any one in claim 1-3, wherein, the molecular sieve is the molecule with FAU structures
One or more in sieve, the molecular sieve with MAZ structures, the molecular sieve with MFI structure, the molecular sieve with BEA structures；
The clay is one or more in Kaolin, galapectite, meerschaum, rectorite and montmorillonite；The boehmite is
One or more in one diaspore, gibbsite and Baeyer stone；The acid is the one kind in hydrochloric acid, nitric acid, phosphoric acid and sulphuric acid
Or it is various.
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