CN108201864B - Rotary feeder for polyolefin solid catalyst - Google Patents
Rotary feeder for polyolefin solid catalyst Download PDFInfo
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- CN108201864B CN108201864B CN201611179003.1A CN201611179003A CN108201864B CN 108201864 B CN108201864 B CN 108201864B CN 201611179003 A CN201611179003 A CN 201611179003A CN 108201864 B CN108201864 B CN 108201864B
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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
- B01J8/00—Chemical or physical processes in general, conducted in the presence of fluids and solid particles; Apparatus for such processes
- B01J8/0015—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor
- B01J8/002—Feeding of the particles in the reactor; Evacuation of the particles out of the reactor with a moving instrument
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F2/00—Processes of polymerisation
- C08F2/01—Processes of polymerisation characterised by special features of the polymerisation apparatus used
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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
- B01J2208/00—Processes carried out in the presence of solid particles; Reactors therefor
- B01J2208/00743—Feeding or discharging of solids
- B01J2208/00752—Feeding
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- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Medicinal Chemistry (AREA)
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- Feeding, Discharge, Calcimining, Fusing, And Gas-Generation Devices (AREA)
- Transition And Organic Metals Composition Catalysts For Addition Polymerization (AREA)
Abstract
A rotary feeder of a solid polyolefin catalyst, the rotary feeder comprising: the shell is internally provided with a cavity; the cylinder is transversely arranged, a circle of groove is formed in the surface of the cylinder, the cylinder is arranged in the cavity, is tightly attached to the cavity and can roll around an axis in the cavity; and the connecting shaft is arranged on the axis of the cylinder, a hole is formed in the position, corresponding to the connecting shaft, of the shell, and the connecting shaft penetrates through the hole. The rotary feeder equipment is simple in structure and convenient to maintain. The solid polyolefin catalyst particles according to the present invention can be continuously, smoothly and accurately fed into the polymerization reactor.
Description
Technical Field
The invention relates to the field of olefin polymerization, in particular to a feeder for a granular solid polyolefin catalyst.
Background
Most of the catalysts currently used in the industry for olefin polymerization are in the form of solid particles, and the solid particle catalyst is usually fed by a specially designed catalyst feeding device, such as that used in Unipol polyethylene devices; in another complicated preparation process, the catalyst is prepared into a slurry or paste with a certain concentration and then fed into the reactor by a metering system. In the two methods, the equipment investment is high, the adding process is easy to block, and an accurate and effective method for acquiring the content of the catalyst in the catalyst feeder is not available. The latter is extremely complicated in preparation process, the preparation of a single catalyst requires more than ten hours, and the catalyst brings slurry or paste into the reaction system, which has an influence on the reaction system.
Polyolefin catalysts generally have a high activity and in practice require the catalyst to be fed into the polymerization reactor at very small flows which are very stable and precisely controlled, otherwise the polymerization reaction is unstable, leading to fluctuations in product quality or to caking in the reactor. Therefore, how to uniformly and accurately add the catalyst into the polymerization reaction system is a key problem to be solved. In addition, the solid olefin polymerization catalyst has poor fluidity, is easy to bond and agglomerate or form bridges in a catalyst tank, and cannot be added into a feeding pipeline through an automatic valve, so that the catalyst cannot be continuously fed, and the reaction is forced to stop.
Chinese patent CN101786552A discloses an automatic powder material metering feeder, which comprises a feeding funnel, wherein the outlet of the feeding funnel is connected with the inlet of a metering ball valve, a storage chamber with certain capacity and capable of rotating is arranged in the material channel of the metering ball valve, the outer wall of the storage chamber is close to the inner wall of the material channel of the metering ball valve, and in the rotating process of the storage chamber, the material inlet and outlet can be connected with the inlet or outlet of the metering ball valve. The invention can realize the feeding of powder with small dosage, but the material is easy to deposit on the inner wall of the material channel, which causes metering error.
Chinese patent CN101811011A discloses an automatic catalyst feeding method, a fluidized conveying air pipeline is arranged to continuously introduce fluidized conveying air into a feeder, a fluidized conveying air regulating valve and a flowmeter are arranged on the fluidized conveying air pipeline, a feeding regulating valve is arranged on the feeding pipe, a communicating pipe is arranged between the top of the feeder and a pipe section of a discharging pipe near an outlet of a discharging valve, a communicating valve and an air pressure regulating valve are arranged on the communicating pipe, the fluidized conveying air is continuously introduced into the feeder, a catalyst circularly flows in a communicated circulating loop at the top of the feeder, the problems of deposition blockage and unstable feeding in the catalyst conveying process are reduced, but a circulating device of the device is arranged at the top of the feeder, strong fluidized conveying air is required in the circulating process, compressed air is generally used as the fluidized conveying air, so the device cost is higher, and the invention also requires that the pressure in the feeder is constantly lower than or equal to the pressure in a catalyst tank through the fluidized conveying air, Higher than the regenerator pressure, which places higher demands on the equipment and increases production costs.
Chinese patent CN 102993342A provides a feeding system of powdered polyolefin catalyst. The system comprises a catalyst tank, a middle tank and a fan, wherein the catalyst tank is connected with the middle tank through a pipeline, an automatic valve is arranged on the pipeline, an inlet and an outlet of the fan are respectively connected with the top and the bottom of the middle tank through pipelines to form a circulation loop, an outlet is arranged on the pipeline close to the top of the middle tank and is connected with a rear system through a pipeline. Two automatic valves connected in series are arranged on a system pipeline connected with the rear system, and a quantitative pipe is arranged between the automatic valves; and the outlets of the two automatic valves are respectively provided with a gas purging pipeline. The invention can continuously add the solid catalyst into the reaction system under normal pressure, but the adding amount of the catalyst can not be controlled due to the lack of a metering device of the catalyst. And this feeding system adopts a catalyst jar and a pans, and catalyst feeding process is long, and catalyst easily gathers and remains in the pans, causes the waste of catalyst.
There is a lack of a catalyst feeder that has a simple equipment configuration, is easy to maintain, and can continuously, smoothly and accurately feed solid polyolefin catalyst particles into a polymerization reactor.
Disclosure of Invention
The invention aims to provide a rotary feeder for a polyolefin solid catalyst.
To achieve the above object, the present invention provides a rotary feeder for a polyolefin solid catalyst, comprising:
the shell is internally provided with a cavity;
the cylinder is transversely arranged, a circle of groove is formed in the surface of the cylinder, the cylinder is arranged in the cavity, is tightly attached to the cavity and can roll around an axis in the cavity; and
the connecting shaft is arranged on the axis of the cylinder, a hole is formed in the position, corresponding to the connecting shaft, of the shell, and the connecting shaft penetrates through the hole.
Furthermore, the space above and below the cavity is communicated with the groove all the time. The catalyst continuously enters the groove and can continuously feed materials through the groove along with the rotation of the cylinder.
Further, the groove is in a slope shape. The size and the shape of the groove directly influence the continuous feeding, the accurate metering and the control of the catalyst, the groove on the surface of the cylinder is in a concave slope shape, the catalyst can continuously enter the groove, and the continuous feeding through the groove along with the rotation of the cylinder is more facilitated.
Further, the angle between the groove and the axis is more than 0 ° and less than 90 °, preferably more than 15 ° and less than 75 °, and more preferably more than 30 ° and less than 60 °. A certain angle is formed between the groove and the axis, so that the blanking speed and blanking amount of the catalyst are easier to control.
Furthermore, the surface of the cavity, the surface of the cylinder and the surface of the groove are smooth surfaces. The smoothness of the surface of the cylinder is beneficial to sealing between the cylinder and the surface of the cavity, the smoothness of the surface of the groove is beneficial to blanking of the catalyst, the catalyst in the groove is effectively prevented from being remained, and accurate metering and control of the blanking of the catalyst are facilitated.
The invention has the beneficial effects that: the feeder has simple structure, can continuously, stably and accurately feed solid polyolefin catalyst particles into a polymerization reactor, saves the production cost of polyolefin, and is convenient for the maintenance of equipment.
Drawings
FIG. 1 is a schematic view of the structure of a feeder for a polyolefin solid catalyst according to the present invention.
FIG. 2 is a cross-sectional view of a cylinder in a feeder for a polyolefin solid catalyst according to the present invention.
Wherein, the reference numbers:
1. outer casing
2. Cylinder body
3. Groove
4. Connecting shaft
α, angle
Detailed Description
The present invention is described in detail below by way of examples, it should be noted that the examples are only for the purpose of further illustration, and should not be construed as limiting the scope of the present invention.
A rotary feeder of a polyolefin solid catalyst, the feeder comprising:
the device comprises a shell 1, wherein a cavity is formed inside the shell 1;
the cylinder 2 is transversely arranged, a circle of groove 3 is formed in the surface of the cylinder 2, and the cylinder 2 is arranged in the cavity, is tightly attached to the cavity and can roll around an axis in the cavity; and
the connecting shaft 4 is arranged on the axis of the cylinder 2, a hole is formed in the position, corresponding to the connecting shaft 4, of the shell 1, and the connecting shaft 4 penetrates through the hole.
Furthermore, the space above and below the cavity is always communicated with the groove 3. The catalyst continuously enters the groove 3 and can be continuously fed through the groove 3 along with the rotation of the cylinder 2.
Further, the groove 3 is in a slope shape. The size and the shape of the groove 3 directly influence the continuous feeding, the accurate metering and the control of the catalyst, the groove 3 on the surface of the cylinder 2 is in a concave slope shape, the catalyst can continuously enter the groove 3, and the continuous feeding of the catalyst through the groove along with the rotation of the cylinder 2 can be more favorably realized.
Further, the included angle α between the groove 3 and the axis is more than 0 degree and less than 90 degrees, preferably more than 15 degrees and less than 75 degrees, more preferably more than 30 degrees and less than 60 degrees.
Furthermore, the surface of the cavity, the surface of the cylinder 2 and the surface of the groove 3 are smooth surfaces. The smoothness on the surface of the cylinder 2 is beneficial to sealing between the cylinder 2 and the surface of the cavity, the smoothness on the surface of the groove 3 is beneficial to blanking of the catalyst, the catalyst in the groove 3 is effectively prevented from being remained, and accurate metering and control of the blanking of the catalyst are facilitated.
Example 1
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 15 ℃, and the different rotating speeds of the cylinder 2 are precisely metered and calibrated by using the spent Ti-based catalyst, the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst feed amounts of the cylinder 2 in 5 min, 10 min, 15 min, 30 min and 1 hour are measured and averaged, then the relationship curve of the catalyst feed amount and the rotating speed of the cylinder 2 is drawn and the relationship formula is determined, the relationship curve or the relationship formula of the catalyst feed amount and the rotating speed of the cylinder 2 is obtained, the catalyst feed amount can be precisely metered and controlled by adjusting the rotating speed of the cylinder 2, and the rotation of the cylinder 2 is controlled by a motor.
Example 2
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 20 ℃, and the different rotating speeds of the cylinder 2 are precisely metered and calibrated by using the spent Cr-series catalyst, the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst feed amounts of the cylinder 2 in 5 min, 10 min, 15 min, 30 min and 1 hour are measured and averaged, then the relationship curve of the catalyst feed amount and the rotating speed of the cylinder 2 is drawn and the relationship formula is determined, the relationship curve or the relationship formula of the catalyst feed amount and the rotating speed of the cylinder 2 is obtained, the catalyst feed amount can be precisely metered and controlled by adjusting the rotating speed of the cylinder 2, and the rotation of the cylinder 2 is controlled by a motor.
Example 3
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 30 ℃, and the cylinder 2 is calibrated by accurately measuring different rotating speeds by using the dead metallocene catalyst, wherein the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst blanking amounts of the cylinder 2 in 5 minutes, 10 minutes, 15 minutes, 30 minutes and 1 hour are measured and averaged, then the relationship curve of the catalyst blanking amount and the rotating speed of the cylinder 2 is drawn and the relationship formula is determined, the relationship curve or the relationship formula of the catalyst blanking amount and the rotating speed of the cylinder 2 is obtained, the catalyst blanking amount can be accurately measured and controlled by adjusting the rotating speed of the cylinder 2, and the rotation of the cylinder 2 is controlled by a motor.
Example 4
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 40 ℃, and the different rotating speeds of the cylinder 2 are calibrated by accurately measuring the different rotating speeds of the cylinder 2 by using the dead metallocene catalyst, wherein the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst blanking amounts of the cylinder 2 in 5 min, 10 min, 15 min, 30 min and 1 hour are measured and averaged, then the relationship curve of the catalyst blanking amount and the rotating speed of the cylinder 2 is drawn and the relationship is determined, the relationship curve or relationship between the catalyst blanking amount and the rotating speed of the cylinder 2 is obtained, the accurate measurement and control of the catalyst blanking amount can be performed by adjusting the rotating speed of the cylinder 2 at present, and the rotation of the cylinder 2 is controlled by a motor.
Example 5
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 50 ℃, and the different rotating speeds of the cylinder 2 are precisely metered and calibrated by using the spent Cr-series catalyst, the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst feed amounts of the cylinder 2 in 5 min, 10 min, 15 min, 30 min and 1 hour are measured and averaged, then the relationship curve of the catalyst feed amount and the rotating speed of the cylinder 2 is drawn and the relationship formula is determined, the relationship curve or the relationship formula of the catalyst feed amount and the rotating speed of the cylinder 2 is obtained, the catalyst feed amount can be precisely metered and controlled by adjusting the rotating speed of the cylinder 2, and the rotation of the cylinder 2 is controlled by a motor.
Example 6
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 60 ℃, and the different rotating speeds of the cylinder 2 are precisely metered and calibrated by using the spent Cr-series catalyst, the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst feed amounts of the cylinder 2 in 5 min, 10 min, 15 min, 30 min and 1 hour are measured and averaged, then the relationship curve of the catalyst feed amount and the rotating speed of the cylinder 2 is drawn and the relationship formula is determined, the relationship curve or the relationship formula of the catalyst feed amount and the rotating speed of the cylinder 2 is obtained, the catalyst feed amount can be precisely metered and controlled by adjusting the rotating speed of the cylinder 2, and the rotation of the cylinder 2 is controlled by a motor.
Example 7
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 65 ℃, and the different rotating speeds of the cylinder 2 are precisely metered and calibrated by using the spent Ti-based catalyst, the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst feed amounts of the cylinder 2 in 5 min, 10 min, 15 min, 30 min and 1 hour are measured and averaged, then the relationship curve of the catalyst feed amount and the rotating speed of the cylinder 2 is drawn and the relationship formula is determined, the relationship curve or the relationship formula of the catalyst feed amount and the rotating speed of the cylinder 2 is obtained, the catalyst feed amount can be precisely metered and controlled by adjusting the rotating speed of the cylinder 2, and the rotation of the cylinder 2 is controlled by a motor.
Example 8
The included angle α between the direction of a circle of grooves 3 on the surface of the cylinder 2 and the axis is determined to be 75 ℃, and the different rotating speeds of the cylinder 2 are precisely metered and calibrated by using the spent Ti-based catalyst, the rotating speeds of the cylinder 2 are respectively set to be 2 r/min, 4 r/min, 6 r/min, 7 r/min, 8 r/min, 9 r/min, 10 r/min, 12 r/min, 14 r/min, 16 r/min, 20 r/min and 30 r/min, the catalyst feed amounts of the cylinder 2 in 5 min, 10 min, 15 min, 30 min and 1 hour are measured and averaged, then the relationship curve of the catalyst feed amount and the rotating speed of the cylinder 2 is drawn and the relationship formula is determined, the relationship curve or the relationship formula of the catalyst feed amount and the rotating speed of the cylinder 2 is obtained, the catalyst feed amount can be precisely metered and controlled by adjusting the rotating speed of the cylinder 2, and the rotation of the cylinder 2 is controlled by a motor.
The feeder does not need to calibrate each catalyst, can accurately calibrate for one time, and can calculate the adding mass of the catalyst through the volume flow and the density of the catalyst. Thus, it was demonstrated that the feeder for solid polyolefin catalyst using the present invention is a catalyst feeder having a simple apparatus construction, which enables solid polyolefin catalyst particles to be continuously, smoothly and accurately fed into a polymerization reactor. The feeder not only saves the production cost of polyolefin, but also is convenient for the maintenance of equipment.
The present invention is capable of other embodiments, and various changes and modifications may be made by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (3)
1. A rotary feeder of solid polyolefin catalyst, characterized in that it is used for the feeding of granular solids, comprising:
the shell is internally provided with a cavity;
the cylinder is transversely arranged, a circle of groove is formed in the surface of the cylinder, the cylinder is arranged in the cavity, is tightly attached to the cavity and can roll around an axis in the cavity; and
the connecting shaft is arranged on the axis of the cylinder, a hole is formed in the position, corresponding to the connecting shaft, of the shell, and the connecting shaft penetrates through the hole;
the included angle between the groove and the axis is larger than 30 degrees and smaller than 60 degrees, and the space above and below the cavity is always communicated with the groove.
2. The rotary feeder of solid polyolefin catalyst according to claim 1, wherein the groove is tapered.
3. The rotary feeder of a solid polyolefin catalyst according to claim 1, wherein the cavity surface, the cylinder surface and the groove surface are smooth surfaces.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611179003.1A CN108201864B (en) | 2016-12-19 | 2016-12-19 | Rotary feeder for polyolefin solid catalyst |
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| CN201611179003.1A CN108201864B (en) | 2016-12-19 | 2016-12-19 | Rotary feeder for polyolefin solid catalyst |
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| CN108201864A CN108201864A (en) | 2018-06-26 |
| CN108201864B true CN108201864B (en) | 2020-07-14 |
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Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4753374A (en) * | 1982-12-20 | 1988-06-28 | Bayer Aktiengesellschaft | Metering apparatus |
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2016
- 2016-12-19 CN CN201611179003.1A patent/CN108201864B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4753374A (en) * | 1982-12-20 | 1988-06-28 | Bayer Aktiengesellschaft | Metering apparatus |
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