Full-automatic closed filtering device for alpha-olefin production

Abstract

The utility model relates to the technical field of alpha-olefin production through ethylene oligomerization, in particular to a full-automatic closed filtering device for alpha-olefin production, which comprises a filter, a high-pressure gas source and a filtrate storage tank, a filter cartridge, a first gas-liquid dual-purpose pipe and a second gas-liquid dual-purpose pipe are arranged in the filter, the first gas-liquid dual-purpose pipe is respectively connected with a stock solution and the high-pressure gas source, and the second gas-liquid dual-purpose pipe is respectively connected with the filtrate storage tank. The first gas-liquid dual-purpose pipe is respectively connected with a high-pressure gas source and a filtrate storage tank, the second gas-liquid dual-purpose pipe is respectively connected with a high-pressure gas source and a filtrate storage tank, the first gas-liquid dual-purpose pipe is arranged towards the outer side of the filter cartridge, and the second gas-liquid dual-purpose pipe is arranged towards the inner side of the filter cartridge. The equipment is closed, safe to operate, free of leakage and clean in environment; a high-pressure air source is adopted for forward and reverse blowing, so that the filter cake can be effectively stripped and fallen off.

Description

TECHNICAL FIELD

[0001] The utility model relates to a-olefin production technology field of ethylene oligomerization, especially a kind of full-automatic closed filter device for a-olefin production. BACKGROUND

[0002] In the production of a-olefin (including 1-butene, 1-hexene, 1-octene) by ethylene oligomerization, excessive polymerization will inevitably occur, generating ethylene polymer. Small polyethylene particles will disperse in the reaction product material, and if not removed, it will affect the long-period operation of the rectification separation unit.

[0003] Currently, in the production process of a-olefin, a small amount of solid polymer in the reaction material is mainly intercepted by a basket filter, and a large number of small particles will enter the downstream refining separation section, mainly affecting the operation of the downstream device. With the extension of the operation time, it will cause the blockage of the tower kettle reboiler and the blockage of the stripping section tray of the downstream device, affecting the long-period operation of the section.

[0004] In the fine chemical production of the prior art, in order to remove activated carbon or catalyst and the like for decolorization in the material system, a candle filter structure is commonly used for closed filtration to achieve the purpose of filtration and improve the site environment. However, the following problems still need to be solved:

[0005] 1. The filtering precision of the basket filter is insufficient, and part of the small solid flows into the downstream, still affecting the operation period;

[0006] 2. The basket filter is easy to block, and cleaning is frequent, which requires a lot of labor;

[0007] 3. The basket filter is opened to remove filter residue, which is accompanied by a lot of unorganized waste gas escaping, and the material medium is flammable and explosive, which has a large safety hazard and environmental problem. INVENTION CONTENTS

[0008] The utility model aims at providing a full-automatic closed filter device for a-olefin production, which has the characteristics of high filtering precision, good economy, safe operation and convenient cleaning.

[0009] The above technical purpose of the utility model is realized by the following technical scheme: a full-automatic closed filter device for a-olefin production, comprising a filter, a high-pressure gas source and a filtrate storage tank, a filter cartridge, a first gas-liquid dual-purpose pipe and a second gas-liquid dual-purpose pipe are arranged in the filter, the first gas-liquid dual-purpose pipe is connected with the raw liquid and the high-pressure gas source respectively, the second gas-liquid dual-purpose pipe is connected with the high-pressure gas source and the filtrate storage tank respectively, the first gas-liquid dual-purpose pipe is arranged towards the outside of the filter cartridge, and the second gas-liquid dual-purpose pipe is arranged towards the inside of the filter cartridge.

[0010] As a preferred, the filter bottom is connected with a filter residue storage tank.

[0011] As preferred, a vibration hammer is arranged on the filter.

[0012] As preferred, a liquid discharge pipe is connected to the bottom of the filter.

[0013] As preferred, an exhaust pipe is connected to the filter.

[0014] As preferred, a heat exchanger is connected to the exhaust pipe.

[0015] As preferred, the filter cartridge comprises a filter framework, and polyester filter membranes are arranged on the inner and outer sides of the filter cartridge.

[0016] As preferred, the filter and each pipe and tank are made of 304 stainless steel.

[0017] In summary, the utility model has the following beneficial effects:

[0018] 1. The filter element of the device adopts common polyester filter membranes, has high filtering precision, easy-to-fall filter cake, long service life and economical filter material.

[0019] 2. The device is closed, safe to operate, has no leakage and clean environment.

[0020] 3. High-pressure gas source is used for forward and reverse blowing, the forward blowing gas dries the filter cake, the reverse blowing gas makes the filter cake fall off, the filter membrane and the filter framework are independent structures, the filter membrane has high elasticity, and the filter cake can be effectively peeled off through the expansion and contraction of the filter membrane.

[0021] 4. The main body of the device is made of 304 stainless steel to prevent material corrosion in an alkaline environment. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a structural schematic view of an embodiment.

[0023] In the figure, 1 is a filter, 11 is a first pneumatic valve, 12 is a second pneumatic valve, 13 is a third pneumatic valve, 14 is a fourth pneumatic valve, 15 is a fifth pneumatic valve, 16 is a sixth pneumatic valve, 17 is a seventh pneumatic valve, 18 is a blowdown valve, 21 is a first gas-liquid dual-purpose pipe, 22 is a second gas-liquid dual-purpose pipe, 23 is an exhaust pipe, 24 is a liquid discharge pipe, 3 is a filter cartridge, 4 is a high-pressure gas source, 5 is a filtrate tank, 6 is a filter residue tank, 7 is a vibration hammer, and 8 is a heat exchanger. DETAILED DESCRIPTION

[0024] The utility model will be further described in detail below in combination with the drawings.

[0025] The specific embodiment is merely an explanation of the utility model, and is not a limitation of the utility model, and a person skilled in the art can make modifications without creative contribution according to the needs after reading the specification, but as long as it is within the scope of the claims of the utility model, it is protected by the patent law.

[0026] Embodiment: as shown in the figure, including filter 1, the top wall in filter 1 is installed filter cartridge 3.Filter cartridge 3 includes filter framework, and the inside and outside of filter cartridge 3 are respectively provided with polyester filter membrane. Figure 1 The second gas-liquid dual-purpose pipe 22 is divided into two routes, one route is connected to high-pressure gas source 4 through the third pneumatic valve 13, and the other route is connected to the filtrate storage tank 5 through the fourth pneumatic valve 14.The side surface of filter 1 is connected with exhaust pipe 23, and the sixth pneumatic valve 16 is arranged on the exhaust pipe 23.The exhaust pipe 23 is connected with the branch of the second gas-liquid dual-purpose pipe 22, and the seventh pneumatic valve 17 is arranged between the exhaust pipe 23 and the second gas-liquid dual-purpose pipe 22.The tail gas and the oil are separated and recovered through the heat exchanger 8 connected with the tail end of the exhaust pipe 23.

[0027] The lower part of filter 1 is closed, and is connected with filter residue storage tank 6, and the blowdown valve 18 is arranged between filter 1 and filter residue storage tank 6.The vibration hammer 7 is installed at the lower part of filter 1.The lower part of filter 1 is connected with the liquid discharge pipe 24, and the fifth pneumatic valve 15 is arranged on the liquid discharge pipe 24.

[0028] The system is designed to control one set of filter machine system by one PLC, and the working process mainly includes filling, circulation, filtering and residue discharge, the control program adopts time sequence control, pressure control method and liquid level control method, the pressure control method, time control method and liquid level control method are used for the key point "filtering", when the pressure reaches the set value or the set time or the liquid level of filter 1 reaches the set value, the system discharges the residue, and other points are controlled by time.

[0029] Working principle: when the original liquid is filtered, the first pneumatic valve 11 and the fourth pneumatic valve 14 are opened, and the second pneumatic valve 12, the third pneumatic valve 13, the fifth pneumatic valve 15, the sixth pneumatic valve 16, the seventh pneumatic valve 17 and the blowdown valve 18 are closed.The original liquid enters filter 1 through the first gas-liquid dual-purpose pipe 21, and then enters the second gas-liquid dual-purpose pipe 22 through filter cartridge 3 and is transported to the filtrate storage tank 5.The solid impurities in the original liquid are intercepted by filter cartridge 3 during the process of entering filter cartridge 3, so that the purpose of filtering impurities is achieved.

[0030] When backwashing the filter cartridge 3, first close the first pneumatic valve 11, the third pneumatic valve 13, the fourth pneumatic valve 14, the sixth pneumatic valve 16, the seventh pneumatic valve 17, and the blowdown valve 18, and open the second pneumatic valve 12 and the fifth pneumatic valve 15 to discharge the residual liquid in the filter 1, and use the high-pressure gas source 4 to perform positive blowing on the outer side of the filter cartridge 3 to quickly dry the solid impurities attached to the filter cartridge 3. During the drying process, open the sixth pneumatic valve 16 and the seventh pneumatic valve 17 to perform exhaust to prevent the pressure in the filter 1 from being too high.

[0031] Then close the second pneumatic valve 12 and the fifth pneumatic valve 15, and open the third pneumatic valve 13 and the blowdown valve 18 to perform back blowing on the inside of the filter cartridge 3, and the dried impurity filter cake on the outer side of the filter cartridge 3 is stripped from the filter cartridge 3 under the action of back blowing. Start the vibration hammer 7 to vibrate the bottom of the filter 1, and the detached filter cake slides into the filter residue storage tank 6.

Claims

1. A fully automatic closed filtration device for a-olefin production comprising a filter (1), characterized in that, It also includes a high-pressure gas source (4), a filtrate storage tank (5), a filter (1) provided with a filter cartridge (3), a first gas-liquid dual-purpose pipe (21), and a second gas-liquid dual-purpose pipe (22), the first gas-liquid dual-purpose pipe (21) is connected with the stock solution and the high-pressure gas source (4) respectively, the second gas-liquid dual-purpose pipe (22) is connected with the high-pressure gas source (4) and the filtrate storage tank (5) respectively, the first gas-liquid dual-purpose pipe (21) is arranged towards the outside of the filter cartridge (3), and the second gas-liquid dual-purpose pipe (22) is arranged towards the inside of the filter cartridge (3).

2. A fully automatic closed filtration device for a-olefin production according to claim 1, characterized in that, The filter (1) is connected with a filter residue storage tank (6) at the bottom.

3. A fully automatic closed filtration device for a-olefin production according to claim 1, characterized in that, A vibration hammer (7) is arranged on the filter (1).

4. The fully automatic closed filtration device for a-olefin production according to claim 1, characterized in that, The filter (1) is connected with a liquid discharge pipe (24) at the bottom.

5. The fully automatic closed filtration device for a-olefin production according to claim 1, characterized in that, The filter (1) is connected with an exhaust pipe (23).

6. A fully automatic closed filtration device for a-olefin production according to claim 5, characterized in that, The exhaust pipe (23) is connected with a heat exchanger (8).

7. The fully automatic closed filtration device for a-olefin production according to claim 1, characterized in that, The filter cartridge (3) comprises a filter framework, and polyester filter membranes are arranged on the inside and outside of the filter cartridge (3).

8. The fully automatic closed filtration device for a-olefin production according to claim 1, characterized in that, The filter (1) and each pipe and storage tank are made of 304 stainless steel.

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