Filtering device and alpha olefin preparation system

Abstract

The utility model relates to the technical field of chemical engineering, in particular to a filtering device and an alpha olefin preparation system.The filtering device comprises a tank body, a first partition plate and a second partition plate which are arranged at intervals in the axial direction of the tank body are arranged in the tank body, and a filtering cavity is defined by the first partition plate, the second partition plate and the side wall of the tank body; a liquid outlet cavity is defined by the second partition plate, the bottom wall of the tank body and the side wall of the tank body; the filter cartridge is arranged in the filter cavity, two ends of the filter cartridge are respectively sealed and fixed with the first partition plate and the second partition plate, and the second partition plate is provided with a through hole for communicating a cartridge cavity of the filter cartridge with the liquid outlet cavity; a to-be-filtered liquid input pipe provided with a first valve body is communicated with the filtering cavity, and a purified liquid output pipe provided with a second valve body is communicated with the liquid outlet cavity; a back-flushing liquid supply pipe provided with a third valve body is communicated with the liquid outlet cavity; and the backwashing liquid outflow pipe provided with the fourth valve body is communicated with the filter cavity, so that the filter cartridge can be backwashed, the filter cartridge does not need to be manually cleaned, and the labor intensity of cleaning the filter device is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical industry, in particular to a filtering device and an alpha olefin preparation system. Background Art

[0002] Alpha olefins are prepared by polymerization reaction with ethylene as raw material under the action of catalyst. During the polymerization reaction, many side reactions of producing oligomer PE gel are produced. The oligomer PE gel will seriously affect the normal operation of the alpha olefin preparation system. The oligomer PE gel in the alpha olefin preparation system needs to be cleaned frequently. At present, the gel produced by the polymerization kettle is mostly filtered by adding a filtering device to the alpha olefin preparation system. However, the existing filtering device requires manual hand-held high-pressure water gun to clean the filter plate of the filtering device, and the labor intensity of cleaning the filtering device is high. Utility Model Content

[0003] The technical problem to be solved by the utility model is that the filter device used in the existing alpha olefin preparation system needs to manually clean the filter plate, and the labor intensity of cleaning the filter plate is high.

[0004] In order to solve the above technical problems, the purpose of the utility model is to provide a filtering device, comprising:

[0005] A tank body, wherein a first partition plate and a second partition plate are arranged in an axial direction of the tank body, wherein the first partition plate, the second partition plate and the side wall of the tank body enclose a filter cavity, and the second partition plate, the bottom wall of the tank body and the side wall of the tank body enclose a liquid cavity;

[0006] A filter cartridge, wherein the filter cartridge is disposed in the filter cavity, and both ends of the filter cartridge are sealed and fixed to the first partition plate and the second partition plate respectively, and the second partition plate is provided with a through hole connecting the cartridge cavity of the filter cartridge and the liquid outlet cavity;

[0007] a liquid input pipe to be filtered, the liquid input pipe to be filtered is connected to the filter chamber, and a first valve body is provided on the liquid input pipe to be filtered;

[0008] A purified liquid output pipe, the purified liquid output pipe is communicated with the liquid outlet cavity, and a second valve body is provided on the purified liquid output pipe;

[0009] a recoil liquid supply pipe, the recoil liquid supply pipe being in communication with the liquid outlet cavity, and the recoil liquid supply pipe being provided with a third valve body;

[0010] A backflushing liquid outflow pipe is connected to the filter chamber and a fourth valve body is provided on the backflushing liquid outflow pipe.

[0011] As a preferred solution, the first baffle and the second baffle are both rotatably connected to the inner side of the tank body;

[0012] The filter cartridges are arranged in plurality at intervals in the axial direction around the tank body, and the second partition plate is provided with the through holes at positions opposite to the filter cartridges;

[0013] The liquid outlet end of the backwash liquid supply pipe is eccentrically arranged with respect to the central axis of the tank body and abuts against the second partition plate, and the distance of the liquid outlet end of the backwash liquid supply pipe from the central axis of the tank body matches the distance between each filter cartridge and the central axis of the tank body;

[0014] The filtering device includes a driving device, which is used to drive the first partition plate and the second partition plate to rotate so that each of the through holes is alternately connected to the liquid outlet end of the backflushing liquid supply pipe, or each of the through holes is staggered with the liquid outlet end of the backflushing liquid supply pipe.

[0015] As a preferred solution, the driving device is a motor fixed on the tank body, and the output shaft of the motor is fixed to the middle part of the first partition.

[0016] As a preferred solution, a transmission rod coaxially arranged with the output shaft is fixed to the first partition plate, and the transmission rod extends to the second partition plate and is fixed to the second partition plate.

[0017] As a preferred solution, the tank body is arranged vertically, and the first partition is located above the second partition.

[0018] As a preferred solution, the filtering device comprises a flushing solvent supply pipe, a liquid outlet of the flushing solvent supply pipe is communicated with the filtering cavity, and a fifth valve body is provided on the flushing solvent supply pipe.

[0019] An alpha olefin preparation system comprises a polymerization kettle and the above-mentioned filtering device, wherein the liquid inlet end of the input pipe of the to-be-filtered liquid of the filtering device is connected with the liquid outlet end of the polymerization kettle.

[0020] As a preferred solution, the α-olefin preparation system comprises a deweighting tower, and the liquid outlet end of the recoil liquid outflow pipe of the filtering device is connected to the feed end of the deweighting tower.

[0021] As a preferred solution, at least two filtering devices are provided, and the filtering devices are arranged in parallel.

[0022] As a preferred solution, a differential pressure gauge is provided on the to-be-filtered liquid inlet pipe and the purified liquid outlet pipe of each of the filtering devices.

[0023] Compared with the prior art, the beneficial effects of the utility model are:

[0024] The filtering device of the utility model comprises a tank body, wherein a first partition plate and a second partition plate are arranged in an axial direction of the tank body at intervals, a filter cavity is enclosed between the first partition plate and the second partition plate and the side wall of the tank body, and a liquid outlet cavity is enclosed between the second partition plate and the bottom wall of the tank body and the side wall of the tank body; a filter cartridge is arranged in the filter cavity, and both ends of the filter cartridge are sealed and fixed to the first partition plate and the second partition plate respectively, and a through hole connecting the cartridge cavity of the filter cartridge and the liquid outlet cavity is arranged at a position where the second partition plate is opposite to the filter cartridge; when filtering, the first valve body and the second valve body are opened, and the third valve body is closed The first valve body and the second valve body are connected to the filter chamber through the filter chamber input pipe, and the solution to be filtered is introduced into the filter chamber. The gel with the filtered solution is blocked in the filter chamber by the filter cartridge, and the purified liquid flows to the liquid outlet chamber through the inner cavity of the filter cartridge, and then flows to the outside of the tank body through the purified liquid outlet pipe; when the gel on the filter cartridge needs to be cleaned, the first valve body and the second valve body are closed, and the third valve body and the fourth valve body are opened, and the backwashing liquid enters the inner cavity of the filter cartridge, thereby flushing the gel attached to the outside of the filter cartridge from the filter cartridge, and the backwashing liquid mixed with the gel flows to the outside of the tank body through the backwashing liquid outlet pipe. Therefore, the filter device of the utility model does not need to manually clean the filter cartridge, which reduces the labor intensity of cleaning the filter device. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a structural schematic diagram of the filtering device of the utility model;

[0026] Figure 2 is a bottom view of the second partition;

[0027] In the figure, 1. tank body, 11. filter chamber, 12. liquid outlet chamber, 2. first partition plate, 3. second partition plate, 31. through hole, 4. filter cartridge, 51. input pipe of filtered liquid, 511. first valve body, 52. output pipe of purified liquid, 521. second valve body, 53. backwashing liquid supply pipe, 531. third valve body, 54. backwashing liquid outflow pipe, 541. fourth valve body, 55. flushing agent supply pipe, 551. fifth valve body, 6. motor, 7. transmission rod. DETAILED DESCRIPTION

[0028] The following is a further detailed description of the specific implementation of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of the present utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. It should be understood that the terms "first", "second", etc. are used in the present utility model to describe various information, but such information should not be limited to these terms, which are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, the "first" information may also be referred to as the "second" information, and similarly, the "second" information may also be referred to as the "first" information.

[0030] like Figure 1 , Figure 2 As shown, a preferred embodiment of the filter device of the utility model comprises:

[0031] A tank body 1, wherein a first partition plate 2 and a second partition plate 3 are arranged in an axial direction of the tank body 1 at intervals, a filter chamber 11 is enclosed between the first partition plate 2 and the second partition plate 3 and the side wall of the tank body 1, and a liquid chamber 12 is enclosed between the second partition plate 3 and the bottom wall of the tank body 1 and the side wall of the tank body 1;

[0032] The filter cartridge 4 is arranged in the filter cavity 11, and the two ends of the filter cartridge 4 are sealed and fixed to the first partition plate 2 and the second partition plate 3 respectively, and a through hole 31 connecting the cartridge cavity of the filter cartridge 4 and the liquid outlet cavity 12 is arranged at a position opposite to the second partition plate 3 and the filter cartridge 4;

[0033] A liquid input pipe 51 to be filtered, the liquid outlet end of the liquid input pipe 51 to be filtered is connected to the filter chamber 11, and a first valve body 511 is provided on the liquid input pipe 51 to be filtered;

[0034] A purified liquid output pipe 52, the liquid inlet end of which is in communication with the liquid outlet cavity 12, and a second valve body 521 is provided on the purified liquid output pipe 52;

[0035] A backflushing liquid supply pipe 53, wherein the liquid outlet end of the backflushing liquid supply pipe 53 is connected to the liquid outlet cavity 12, and a third valve body 531 is provided on the backflushing liquid supply pipe 53;

[0036] The backflushing liquid outflow pipe 54 has a liquid inlet end communicated with the filter chamber 11 , and a fourth valve body 541 is disposed on the backflushing liquid outflow pipe 54 .

[0037] During filtration, the first valve body 511 and the second valve body 521 are opened, the third valve body 531 and the fourth valve body 541 are closed, and the solution to be filtered is introduced into the filter chamber 11 through the filter liquid input pipe 51. The gel with the filtered solution is blocked in the filter chamber 11 by the filter cartridge 4, and the purified liquid flows through the inner cavity of the filter cartridge 4 to the liquid outlet cavity 12, and then flows to the outside of the tank body 1 through the purified liquid output pipe 52; when the gel on the filter cartridge 4 needs to be cleaned, the first valve body 511 and the second valve body 521 are closed, the third valve body 531 and the fourth valve body 541 are opened, and the backwash liquid enters the inner cavity of the filter cartridge 4, thereby flushing the gel attached to the outside of the filter cartridge 4 from the filter cartridge 4, and the backwash liquid mixed with the gel flows to the outside of the tank body 1 through the backwash liquid outflow pipe 54. Therefore, the filter device of the utility model does not need to manually clean the filter cartridge 4, which reduces the labor intensity of cleaning the filter device.

[0038] In order to increase the impact pressure of the backwashing liquid on the filter cartridge 4, in this embodiment, the diameter of the filter cartridge 4 is set to be smaller, and a plurality of filter cartridges 4 are provided, and each filter cartridge 4 is backwashed respectively to increase the impact pressure of the flushing liquid on the filter cartridge 4; specifically, the first baffle 2 and the second baffle 3 are both rotatably connected to the inner side of the tank body 1; a plurality of filter cartridges 4 are arranged at intervals in the axial direction of the tank body 1, and a through hole 31 is provided at a position where the second baffle 3 and each filter cartridge 4 are opposite; the backwashing liquid supply pipe 53 is connected to the backwashing liquid supply pipe 53 at the outlet end of the backwashing liquid supply pipe 53; The liquid outlet of the backflushing liquid supply pipe 53 is eccentrically arranged with respect to the central axis of the tank body 1 and abuts against the second partition 3. The distance at which the liquid outlet of the backflushing liquid supply pipe 53 deviates from the central axis of the tank body 1 matches the distance between each filter cartridge 4 and the central axis of the tank body 1. The filtering device includes a driving device, which is used to drive the first partition 2 and the second partition 3 to rotate, so that each through hole 31 is alternately connected with the liquid outlet of the backflushing liquid supply pipe 53, or each through hole 31 is staggered with the liquid outlet of the backflushing liquid supply pipe 53. In this embodiment, the distance at which the liquid outlet of the backflushing liquid supply pipe 53 deviates from the central axis of the tank body 1 is the same as the distance between each filter cartridge 4 and the central axis of the tank body 1. There are four filter cartridges. The first partition of the driving device rotates 90° to switch the liquid outlet of the backflushing liquid supply pipe 53 from backflushing one filter cartridge to backflushing another filter cartridge.

[0039] Among them, the driving device is a motor 6 fixed on the tank body 1, and the output shaft of the motor 6 is fixed to the middle part of the first partition 2; each filter cartridge 4 can not only play a filtering role, but also connect the first partition 2 and the second partition 3 into an integral structure. Furthermore, in order to improve the connection stability between the first partition 2 and the second partition 3, the first partition 2 is fixed with a transmission rod 7 coaxially arranged with the output shaft, and the transmission rod 7 extends to the second partition 3 and is fixed to the second partition 3.

[0040] In this embodiment, in order to facilitate the outflow of the purified liquid after filtering in the filter cartridge 4 , the tank body 1 is arranged vertically, and the first partition plate 2 is located above the second partition plate 3 .

[0041] In order to reduce the adhesion between the gel and the filter cartridge 4 during the backwashing process, in this embodiment, the filter device includes a flushing solvent supply pipe, the liquid outlet of the flushing solvent supply pipe is connected to the filter chamber 11, and the flushing solvent supply pipe is provided with a fifth valve body 551. Specifically, before backwashing, the fifth valve body 551 is opened, and a certain amount of flushing solvent is added into the filter chamber 11 through the flushing solvent supply pipe, so that the gel particles adhered to the outside of the filter cartridge 4 are more easily detached under the chemical action of the flushing solvent.

[0042] A preferred embodiment of an alpha olefin preparation system of the utility model comprises a polymerization kettle and the above-mentioned filtering device, wherein the liquid inlet end of the to-be-filtered liquid input pipe 51 of the filtering device is connected to the liquid outlet end of the polymerization kettle.

[0043] Furthermore, in this embodiment, the alpha olefin preparation system includes a deweighting tower, and the outlet end of the backwash liquid outlet pipe 54 of the filtration device is connected to the feed end of the deweighting tower. The deweighting tower can discharge the oligomer gel as a heavy component, thereby realizing the recycling of the filtered gel.

[0044] In order to avoid system shutdown caused by maintenance of the filter device, in this embodiment, at least two filter devices are provided, and each filter device is arranged in parallel. Specifically, three filter devices are provided, and a differential pressure gauge is provided on the to-be-filtered liquid input pipe 51 and each purified liquid output pipe 52 of each filter device. When the differential pressure gauge measures that the pressure difference between the to-be-filtered liquid input pipe 51 and the purified liquid output pipe 52 of a certain filter device is large, the filter device is switched to the backwash state.

[0045] In summary, the filtering device of the utility model comprises a tank body 1, wherein a first partition plate 2 and a second partition plate 3 are arranged in the tank body 1 along the axial direction of the tank body 1, wherein the first partition plate 2 and the second partition plate 3 and the side wall of the tank body 1 enclose a filter chamber 11, and the second partition plate 3 and the bottom wall of the tank body 1 and the side wall of the tank body 1 enclose a liquid outlet chamber 12; a filter cartridge 4 is arranged in the filter chamber 11, and the two ends of the filter cartridge 4 are sealed and fixed to the first partition plate 2 and the second partition plate 3 respectively, and a through hole 31 connecting the cartridge chamber of the filter cartridge 4 and the liquid outlet chamber 12 is arranged at a position opposite to the second partition plate 3 and the filter cartridge 4; during filtering, the first valve body 511 and the second valve body 521 are opened, and the third valve body 521 is closed. The first valve body 511 and the second valve body 521 are connected to the filter cartridge 4, and the third valve body 531 and the fourth valve body 541 are connected to the filter cartridge 4. The solution to be filtered is introduced into the filter chamber 11 through the filter liquid input pipe 51. The gel with the filtered solution is blocked in the filter chamber 11 by the filter cartridge 4. The purified liquid flows to the liquid outlet chamber 12 through the inner cavity of the filter cartridge 4, and then flows to the outside of the tank body 1 through the purified liquid output pipe 52. When it is necessary to clean the gel on the filter cartridge 4, the first valve body 511 and the second valve body 521 are closed, and the third valve body 531 and the fourth valve body 541 are opened. The backwashing liquid enters the inner cavity of the filter cartridge 4, thereby flushing the gel attached to the outside of the filter cartridge 4 from the filter cartridge 4. The backwashing liquid mixed with the gel flows to the outside of the tank body 1 through the backwashing liquid outflow pipe 54. Therefore, the filter device of the utility model does not need to manually clean the filter cartridge 4 with a handheld water gun, which reduces the labor intensity of cleaning the filter device.

[0046] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principle of the present invention. These improvements and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. A filtering device, characterized in that: include: A tank body (1), wherein a first partition plate (2) and a second partition plate (3) are arranged in an axial direction of the tank body (1) at intervals, the first partition plate (2) and the second partition plate (3) together with the side wall of the tank body (1) enclose a filter chamber (11), and the second partition plate (3) together with the bottom wall of the tank body (1) and the side wall of the tank body (1) enclose a liquid chamber (12); A filter cartridge (4), the filter cartridge (4) being arranged in the filter cavity (11), the two ends of the filter cartridge (4) being sealed and fixed to the first partition plate (2) and the second partition plate (3) respectively, the second partition plate (3) being provided with a through hole (31) connecting the cartridge cavity of the filter cartridge (4) and the liquid outlet cavity (12); a liquid to be filtered input pipe (51), the liquid to be filtered input pipe (51) being in communication with the filter chamber (11), and a first valve body (511) being provided on the liquid to be filtered input pipe (51); a purified liquid output pipe (52), the purified liquid output pipe (52) being in communication with the liquid outlet chamber (12), and a second valve body (521) being provided on the purified liquid output pipe (52); a recoil liquid supply pipe (53), the recoil liquid supply pipe (53) being in communication with the liquid outlet chamber (12), and a third valve body (531) being provided on the recoil liquid supply pipe (53); A backflushing liquid outflow pipe (54), the backflushing liquid outflow pipe (54) being in communication with the filter chamber (11), and a fourth valve body (541) being provided on the backflushing liquid outflow pipe (54).

2. The filtering device according to claim 1, characterized in that: The first baffle (2) and the second baffle (3) are both rotatably connected to the inner side of the tank body (1); A plurality of filter cartridges (4) are arranged at intervals in the axial direction around the tank body (1), and the second partition plate (3) is provided with a through hole (31) at a position opposite to each of the filter cartridges (4); The liquid outlet end of the backflushing liquid supply pipe (53) is eccentrically arranged with respect to the central axis of the tank body (1) and abuts against the second partition plate (3), and the distance of the liquid outlet end of the backflushing liquid supply pipe (53) from the central axis of the tank body (1) matches the distance between each filter cartridge (4) and the central axis of the tank body (1); The filtering device comprises a driving device, the driving device being used to drive the first partition plate (2) and the second partition plate (3) to rotate so that each of the through holes (31) is alternately connected to the liquid outlet end of the backflushing liquid supply pipe (53), or so that each of the through holes (31) is staggered with the liquid outlet end of the backflushing liquid supply pipe (53).

3. The filtering device according to claim 2, characterized in that: The driving device is a motor (6) fixed on the tank body (1), and the output shaft of the motor (6) is fixed to the middle part of the first partition plate (2).

4. The filtering device according to claim 3, characterized in that: A transmission rod (7) coaxially arranged with the output shaft is fixed to the first partition plate (2); the transmission rod (7) extends to the second partition plate (3) and is fixed to the second partition plate (3).

5. The filtering device according to claim 1, characterized in that: The tank body (1) is arranged vertically, and the first partition (2) is located above the second partition (3).

6. The filtering device according to claim 1, characterized in that: The filtering device comprises a flushing solvent supply pipe, the liquid outlet of the flushing solvent supply pipe is in communication with the filtering chamber (11), and a fifth valve body (551) is provided on the flushing solvent supply pipe.

7. An alpha olefin production system, characterized in that: It comprises a polymerization kettle and the filtering device according to any one of claims 1 to 6, wherein the liquid inlet end of the to-be-filtered liquid input pipe (51) of the filtering device is connected to the liquid outlet end of the polymerization kettle.

8. The alpha olefin production system according to claim 7, characterized in that: The alpha olefin preparation system comprises a deweighting tower, and the liquid outlet end of the backwash liquid outflow pipe (54) of the filtering device is connected to the feed end of the deweighting tower.

9. The alpha olefin production system according to claim 7, characterized in that: There are at least two filtering devices, and the filtering devices are arranged in parallel.

10. The alpha olefin production system according to claim 9, characterized in that: A differential pressure gauge is provided on the to-be-filtered liquid input pipe (51) of each filtering device and the purified liquid output pipe (52) of each filtering device.

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