Cleaning device for online cleaning styrene polymer in dehydrogenation liquid

Abstract

The utility model relates to the technical field of styrene production, and provides a cleaning device for online cleaning of styrene polymers in dehydrogenation liquid, the cleaning device comprises an oil-water separator, a filter, a gas-liquid separation tank, a vacuum pump and a first delivery pump, the oil-water separator is connected with the filter through a first pipeline, a first valve is arranged on the first pipeline, and a second valve is arranged on the second pipeline. The filter is connected with the gas-liquid separation tank through a second pipeline, a second valve is arranged on the second pipeline, the vacuum pump is connected with the upper part of the gas-liquid separation tank through a third pipeline, a third valve is arranged on the third pipeline, and negative pressure is formed in the gas-liquid separation tank through the vacuum pump; the first delivery pump is connected with the lower part of the gas-liquid separation tank through a fourth pipeline, and a fourth valve is arranged on the fourth pipeline. According to the cleaning device, polymers in dehydrogenation liquid can be cleaned on line in the production process, the effect of cleaning while production is achieved, shutdown is not needed, and normal production is not affected.

Description

Technical Field

[0001] The present application belongs to the technical field of styrene production, and more specifically, to a cleaning device for online cleaning of styrene polymers in dehydrogenation liquid. Background Art

[0002] Styrene is an important chemical organic raw material, mainly used to manufacture polymer synthetic materials such as ABS, SBS, EPS, SBR, etc. The domestic market has a large demand for styrene, and the production of styrene helps to increase corporate profits. However, styrene has an unsaturated double bond, which is prone to polymerization or copolymerization with other substances during the production process, resulting in a decline in product quality and causing economic losses. A company uses the ethylbenzene negative pressure adiabatic dehydrogenation to styrene technology jointly developed by Shanghai Petrochemical Research Institute, East China University of Science and Technology and Sinopec Shanghai Engineering Company. Compared with other ethylbenzene to styrene technologies, the ethylbenzene negative pressure adiabatic dehydrogenation to styrene has the advantages of simple reactor structure, low equipment cost, simple process flow, and large production capacity.

[0003] The negative pressure adiabatic styrene production technology of ethylbenzene includes a steam superheater system, a dehydrogenation reaction system, an oil-water separation system, a condensate stripping system, an exhaust gas recovery system, a separation system, etc. The dehydrogenated liquid produced after the dehydrogenation of ethylbenzene is cooled by the condenser and sent to the oil-water separator for separation of the oil phase and the water phase, wherein the oil phase is pumped to the tank area by the dehydrogenated liquid pump, and the water phase is pumped into the stripping tower by the process condensate pump. Since the dehydrogenated liquid contains a large amount of styrene, it is very easy to self-polymerize in actual production to produce polymers. The accumulation of polymers in the oil-water separator will cause the machine pump to be blocked, and the machine must be stopped for maintenance, affecting normal production and causing large economic losses. Therefore, preventing the generation of polymers or developing efficient and convenient polymer cleaning methods is the focus of future research and development. Ensuring normal production, reducing energy consumption and material consumption in styrene production, thereby improving production efficiency and achieving clean production are also goals that need to be achieved in future styrene production. Utility Model Content

[0004] The purpose of the embodiments of the present application is to provide an online cleaning device for cleaning styrene polymers in dehydrogenation liquid, so as to solve the technical problem in the prior art that polymer accumulation in the oil-water separator will cause machine pump blockage, necessitating shutdown for maintenance, affecting normal production and causing large economic losses.

[0005] To achieve the above-mentioned purpose, the technical solution adopted in the present application is: to provide a cleaning device for online cleaning of styrene polymers in dehydrogenation liquid, comprising: an oil-water separator, a filter, a gas-liquid separation tank, a vacuum pump and a first delivery pump, the oil-water separator and the filter are connected by a first pipeline, the first pipeline is provided with a first valve, the filter is connected to the gas-liquid separation tank through a second pipeline, the second pipeline is provided with a second valve, the vacuum pump is connected to the upper part of the gas-liquid separation tank through a third pipeline, the third pipeline is provided with a third valve, and the vacuum pump forms a negative pressure in the gas-liquid separation tank; the first delivery pump is connected to the lower part of the gas-liquid separation tank through a fourth pipeline, and the fourth pipeline is provided with a fourth valve.

[0006] In one embodiment, the first delivery pump is connected to the oil-water separator through a fifth pipeline, a fifth valve is provided on the fifth pipeline, the oil-water separator is connected to the second delivery pump through a sixth pipeline, a sixth valve is provided on the sixth pipeline, the second delivery pump is connected to the dehydrogenation liquid storage tank through a seventh pipeline, and a seventh valve is provided on the seventh pipeline.

[0007] In one embodiment, the first valve, the second valve, the third valve, the fourth valve, the fifth valve, the sixth valve and the seventh valve are all manual valves.

[0008] In one embodiment, the first delivery pump is connected to a dehydrogenation liquid storage tank via a fifth pipeline, and a fifth valve is disposed on the fifth pipeline.

[0009] In one embodiment, the first valve, the second valve, the third valve, the fourth valve and the fifth valve are all manual valves.

[0010] In one embodiment, the filter includes a housing and a filter screen cartridge, an openable and closable top cover is provided on the upper portion of the housing, and the filter screen cartridge is detachably installed in the housing.

[0011] In one embodiment, a filter element is disposed in the filter cylinder.

[0012] In one embodiment, at least two filters are arranged in parallel.

[0013] The beneficial effects of the online cleaning device for cleaning styrene polymer in dehydrogenation liquid provided by the present application are:

[0014] 1. The cleaning device can realize online cleaning of polymers in the dehydrogenation liquid during the production process, achieving the effect of cleaning while producing, without stopping work and without affecting normal production.

[0015] 2. The filter cylinder in the filter is detachable, which improves the convenience of polymer cleaning.

[0016] 3. The treated dehydrogenation liquid flows back to the oil-water separator or dehydrogenation liquid storage tank, and toxic and harmful media will not be released to the outside, ensuring environmental protection.

[0017] 4. Each component is connected by pipes, which is convenient for disassembly and assembly, and convenient for subsequent position adjustment or rectification.

[0018] 5. When production is stopped, the water in the oil-water separation tank can be used to carry out closed cleaning of the interior of the cleaning device, saving resources and not causing pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 A schematic diagram of the structure of a cleaning device for online cleaning of styrene polymer in dehydrogenation liquid provided in Example 1 of the present application;

[0021] Figure 2 This is a schematic diagram of the structure of the online cleaning device for cleaning styrene polymers in dehydrogenation liquid provided in Example 2 of the present application.

[0022] Among them, the reference numerals in the figure are:

[0023] 1. Oil-water separator; 2. First valve; 3. Filter; 4. Second valve; 5. Gas-liquid separation tank; 6. Third valve; 7. Vacuum pump; 8. Fourth valve; 9. First delivery pump; 10. Fifth valve; 11. Sixth valve; 12. Second delivery pump; 13. Seventh valve; 14. Dehydrogenation liquid storage tank. DETAILED DESCRIPTION

[0024] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0025] It should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or indirectly connected to the other element.

[0026] It should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0027] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0028] Embodiment 1:

[0029] like Figure 1 As shown, a cleaning device for cleaning styrene polymer in dehydrogenation liquid online comprises: an oil-water separator 1, a filter 3, a gas-liquid separation tank 5, a vacuum pump 7 and a first delivery pump 9. The oil-water separator 1 is connected to the filter 3 through a first pipeline, a first valve 2 is provided on the first pipeline, the filter 3 is connected to the gas-liquid separation tank 5 through a second pipeline, a second valve 4 is provided on the second pipeline, the vacuum pump 7 is connected to the upper part of the gas-liquid separation tank 5 through a third pipeline, a third valve 6 is provided on the third pipeline, and the vacuum pump 7 forms a negative pressure in the gas-liquid separation tank 5; the first delivery pump 9 is connected to the lower part of the gas-liquid separation tank 5 through a fourth pipeline, a fourth valve 8 is provided on the fourth pipeline. The first delivery pump 9 is connected to the oil-water separator 1 through a fifth pipeline, a fifth valve 10 is provided on the fifth pipeline, the oil-water separator 1 is connected to the second delivery pump 12 through a sixth pipeline, a sixth valve 11 is provided on the sixth pipeline, the second delivery pump 12 is connected to the dehydrogenation liquid storage tank 14 through a seventh pipeline, and a seventh valve 13 is provided on the seventh pipeline.

[0030] When the dehydrogenated liquid in the oil-water separator 1 is mixed with polymer, the first valve 2, the second valve 4, the third valve 6, the fourth valve 8 and the fifth valve 10 are opened, and the vacuum pump 7 is started, so that the gas-liquid separation tank 5 is in a negative pressure state, and the dehydrogenated liquid in the oil-water separator 1 enters the filter 3 for filtration. After the polymer is filtered, the dehydrogenated liquid enters the gas-liquid separation tank 5, and the gas is extracted by the vacuum pump 7; the liquid flows back to the oil-water separator 1 through the action of the first delivery pump 9, thereby realizing the online cleaning of the polymer in the oil-water separator 1. When the polymer cleaning is completed, the sixth valve 11 and the seventh valve 13 are opened, and the dehydrogenated liquid in the oil-water separator 1 that does not contain polymer is sent to the dehydrogenated liquid storage tank 14 by the action of the second delivery pump 12 for temporary storage, so as to be processed in the next step.

[0031] In this embodiment, the first valve 2, the second valve 4, the third valve 6, the fourth valve 8, the fifth valve 10, the sixth valve 11 and the seventh valve 13 are all manual valves, which makes it convenient for the staff to confirm whether all valves are open or closed.

[0032] In this embodiment, the filter 3 includes a housing and a filter screen cartridge. The upper part of the housing is provided with an openable and closable top cover, and the filter screen cartridge is detachably installed in the housing. This makes it convenient to remove the filter screen cartridge and clean the filtered polymer. Preferably, a filter core is provided in the filter screen cartridge to improve the effect of filtering the polymer.

[0033] In this embodiment, at least two filters 3 are arranged in parallel. The two filters 3 can work simultaneously, or one can work while the other cleans the filter cylinder, thereby achieving online non-stop filtering.

[0034] In this embodiment, a pressure gauge is provided on the top of the filter 3. When the polymer accumulates in the filter 3 over time, the pressure will drop and the pressure gauge pointer will shake. When the pressure is lower than the atmospheric pressure, the filter cylinder needs to be cleaned and replaced. The specific operation is: first close the first valve 2, open the drain valve at the bottom of the filter 3, drain the liquid inside the filter 3 into the dense packing, open the detachable top cover on the top of the filter 3, and disassemble, clean and replace the filter cylinder.

[0035] When the work is stopped, the oil-water separator 1 needs to be closed and cleaned. First, the oil-water separator 1 is unloaded. After the unloading is completed, the first pipeline of the filter 3 is connected to the water phase of the oil-water separator 1. The water phase passes through the filter 3 and the gas-liquid separation tank 5 in sequence and then enters the oil-water separator 1 to clean the entire oil-water separator 1.

[0036] Embodiment 2:

[0037] like Figure 2As shown, a cleaning device for online cleaning of styrene polymer in dehydrogenation liquid comprises: an oil-water separator 1, a filter 3, a gas-liquid separation tank 5, a vacuum pump 7 and a first delivery pump 9, the oil-water separator 1 and the filter 3 are connected through a first pipeline, a first valve 2 is provided on the first pipeline, the filter 3 is connected to the gas-liquid separation tank 5 through a second pipeline, a second valve 4 is provided on the second pipeline, the vacuum pump 7 is connected to the upper part of the gas-liquid separation tank 5 through a third pipeline, a third valve 6 is provided on the third pipeline, and the vacuum pump 7 forms a negative pressure in the gas-liquid separation tank 5; the first delivery pump 9 is connected to the lower part of the gas-liquid separation tank 5 through a fourth pipeline, a fourth valve 8 is provided on the fourth pipeline, the first delivery pump 9 is connected to the dehydrogenation liquid storage tank 14 through a fifth pipeline, and a fifth valve 10 is provided on the fifth pipeline.

[0038] Preferably, the first valve 2 , the second valve 4 , the third valve 6 , the fourth valve 8 and the fifth valve 10 are all manual valves.

[0039] In this embodiment, the filter 3 includes a housing and a filter screen cartridge, the upper part of the housing is provided with an openable and closable top cover, and the filter screen cartridge is detachably installed in the housing. Preferably, a filter core is provided in the filter screen cartridge. Preferably, at least two filters 3 are provided in parallel.

[0040] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A cleaning device for online cleaning of styrene polymer in dehydrogenation liquid, characterized in that: include: An oil-water separator (1), a filter (3), a gas-liquid separation tank (5), a vacuum pump (7) and a first delivery pump (9), wherein the oil-water separator (1) and the filter (3) are connected via a first pipeline, a first valve (2) is provided on the first pipeline, the filter (3) is connected to the gas-liquid separation tank (5) via a second pipeline, a second valve (4) is provided on the second pipeline, the vacuum pump (7) is connected to the upper part of the gas-liquid separation tank (5) via a third pipeline, a third valve (6) is provided on the third pipeline, and the vacuum pump (7) forms a negative pressure in the gas-liquid separation tank (5); the first delivery pump (9) is connected to the lower part of the gas-liquid separation tank (5) via a fourth pipeline, a fourth valve (8) is provided on the fourth pipeline.

2. The cleaning device for cleaning styrene polymer in dehydrogenation liquid online as claimed in claim 1, characterized in that: The first delivery pump (9) is connected to the oil-water separator (1) via a fifth pipeline, a fifth valve (10) is provided on the fifth pipeline, the oil-water separator (1) is connected to the second delivery pump (12) via a sixth pipeline, a sixth valve (11) is provided on the sixth pipeline, the second delivery pump (12) is connected to the dehydrogenation liquid storage tank (14) via a seventh pipeline, a seventh valve (13) is provided on the seventh pipeline.

3. The cleaning device for cleaning styrene polymer in dehydrogenation liquid online as claimed in claim 2, characterized in that: The first valve (2), the second valve (4), the third valve (6), the fourth valve (8), the fifth valve (10), the sixth valve (11) and the seventh valve (13) are all manual valves.

4. The cleaning device for cleaning styrene polymer in dehydrogenation liquid online as claimed in claim 1, characterized in that: The first delivery pump (9) is connected to a dehydrogenation liquid storage tank (14) via a fifth pipeline, and a fifth valve (10) is provided on the fifth pipeline.

5. The cleaning device for cleaning styrene polymer in dehydrogenation liquid online as claimed in claim 4, characterized in that: The first valve (2), the second valve (4), the third valve (6), the fourth valve (8) and the fifth valve (10) are all manual valves.

6. The cleaning device for cleaning styrene polymer in dehydrogenation liquid online according to any one of claims 1 to 5, characterized in that: The filter (3) comprises a housing and a filter screen cartridge, the upper portion of the housing is provided with an openable and closable top cover, and the filter screen cartridge is detachably mounted in the housing.

7. The cleaning device for cleaning styrene polymer in dehydrogenation liquid online as claimed in claim 6, characterized in that: A filter core is arranged in the filter screen cylinder.

8. The cleaning device for cleaning styrene polymer in dehydrogenation liquid online as claimed in claim 7, characterized in that: At least two filters (3) are arranged in parallel.

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