Purification kettle for succinic anhydride production

Abstract

The utility model relates to the technical field of butanedioic anhydride production, and one embodiment of the disclosure provides a purification kettle for butanedioic anhydride production, which comprises a kettle tank, a feeding cover arranged at the upper end of the kettle tank, a blowing purification assembly arranged in the kettle tank, and a stirring discharge assembly arranged at the bottom of the kettle tank; the blowing purification assembly comprises an air inlet pipe, a bottom plate is arranged in the feeding tank, and the bottom plate is connected with the feeding tank through a hinge. According to the technical scheme, the problems that various impurities are often mixed into a succinic anhydride crude product produced in the prior art, the sources of the impurities are wide, on one hand, some associated impurity components possibly exist in the raw material, cannot be completely removed in the reaction process and are finally mixed into the succinic anhydride product are solved; on the other hand, some by-product impurities can be generated due to side reaction in the reaction process, for example, other oxygen-containing compound impurities can be generated due to incomplete hydrogenation or excessive hydrogenation in the process of preparing succinic anhydride through maleic anhydride hydrogenation.

Description

TECHNICAL FIELD

[0001] Embodiments of the present disclosure relate to the technical field of succinic anhydride production, in particular, to a purification kettle for succinic anhydride production. BACKGROUND

[0002] Succinic anhydride, as a key organic chemical raw material, is widely used in many fields. In the field of degradable materials, it is an important monomer raw material for synthesizing petroleum-based degradable polyester (such as polybutylene succinate, i.e. PBS). PBS has similar physical and mechanical properties to polypropylene and is expected to be used in disposable plastic fields such as straws and disposable tableware to replace polypropylene on a large scale, which is of great significance to alleviate white pollution. In the pharmaceutical industry, succinic anhydride participates in various drug synthesis reactions and can be used to prepare some drug intermediates with specific therapeutic effects. In the coating industry, it can be used as a raw material to optimize the performance of coatings and improve the adhesion and durability of coatings.

[0003] At present, there are various production processes for succinic anhydride, such as the method of preparing succinic anhydride by hydrogenation of maleic anhydride. However, regardless of the production process used, the crude succinic anhydride product often contains various impurities. These impurities have a wide range of sources. On the one hand, some associated impurity components may be present in the raw materials and cannot be completely removed during the reaction process, eventually mixing into the succinic anhydride product. On the other hand, some by-product impurities may be generated due to the occurrence of side reactions during the reaction process, such as other oxygen-containing compound impurities generated due to incomplete or excessive hydrogenation in the process of preparing succinic anhydride by hydrogenation of maleic anhydride.

[0004] Traditional purification methods for succinic anhydride have many drawbacks. The early simple filtration method can only remove some solid impurities with large particle sizes and is ineffective for removing small particle impurities and impurities dissolved in succinic anhydride, resulting in poor purification effect and difficulty in improving product purity. Although some methods using chemical reagents for purification can remove some specific impurities to some extent, new chemical substances are introduced, which not only increases the process of separating new impurities, but also may affect the quality and performance of succinic anhydride products due to the residual chemical reagents. In some purification equipment mainly using reaction kettles, the gas distribution is uneven, resulting in inconsistent material purification degree. At the same time, the stirring and discharging processes are inefficient, which is difficult to meet the demand for high efficiency and continuous production in large-scale industrial production. With the increasing demand for succinic anhydride product quality in various industries, it is urgent to develop a purification equipment and process that is efficient, stable and suitable for large-scale production. This is also an important background for developing a purification kettle for succinic anhydride production. CONTENT OF THE INVENTION

[0005] To overcome the above defects, the embodiments of the present disclosure provide a purification kettle for succinic anhydride production, which solves the problem that various impurities are often mixed in the crude succinic anhydride product in the prior art. These impurities are widely sourced. On the one hand, some associated impurity components may be contained in the raw material itself, which cannot be completely removed in the reaction process and finally mixed into the succinic anhydride product. On the other hand, some by-product impurities may be generated due to the occurrence of side reactions in the reaction process. For example, other oxygen-containing compound impurities may be generated due to incomplete or excessive hydrogenation in the process of preparing succinic anhydride from maleic anhydride.

[0006] According to one aspect, at least one embodiment of the present disclosure provides a purification kettle for succinic anhydride production, which comprises:

[0007] A kettle is provided with a feeding cover at the upper end thereof;

[0008] A blowing purification assembly is arranged in the interior of the kettle;

[0009] A stirring discharge assembly is arranged at the bottom of the kettle;

[0010] The blowing purification assembly comprises a gas inlet pipe arranged at the side wall of the kettle, a feeding tank arranged in the interior of the kettle, the feeding tank being in communication with the feeding cover, the gas inlet pipe being in communication with the feeding tank, an exhaust port being formed in the side wall of the feeding tank, an exhaust pipe being arranged on the exhaust port and extending out of the kettle, a bottom plate being arranged in the interior of the feeding tank, and the bottom plate being hingedly connected with the feeding tank.

[0011] As a further technical solution, a telescopic air cylinder is inserted into the kettle, a push rod is arranged at the telescopic end of the telescopic air cylinder, a push block is arranged at the end of the push rod, a pulley is arranged on the upper end surface of the push block, and the pulley is attached to the bottom plate.

[0012] As a further technical solution, the stirring discharge assembly comprises a discharge port formed in the bottom of the kettle, a plug-in sleeve is sleeved on the lower end surface of the kettle, a dropping port is arranged on the lower end surface of the plug-in sleeve, and the dropping port corresponds to the position of the discharge port.

[0013] As a further technical solution, a driving port is formed in the plug-in sleeve, an output motor is arranged at the bottom of the kettle, a rotating sleeve is arranged at the output end of the output motor, and a driving vane is arranged on the side wall of the rotating sleeve.

[0014] As a further technical solution, a motor base is arranged at the lower end of the output motor, an adjusting motor is arranged on the lower end surface of the motor base, a driving disc is arranged at the output end of the adjusting motor, and the driving disc is fixedly connected with the plug-in sleeve.

[0015] As a further technical solution, the lower end surface of the plug-in sleeve is provided with a supporting leg, and the plug-in sleeve is sealingly attached to the side wall of the kettle.

[0016] As a further technical solution, the air inlet pipe is internally provided with an air inlet fan, the air inlet fan is embedded in the inside of the air inlet pipe, and the air inlet pipe is provided with a filter screen plate.

[0017] As a further technical solution, the number of filter screen plates is several, and the mesh diameters of the plurality of filter screen plates are sequentially arranged from large to small.

[0018] The embodiments of the present disclosure have the following beneficial effects:

[0019] 1. In the present disclosure, the air inlet pipe is provided with multi-stage filter screen plates from large to small (such as 2mm→0.5mm pore size decrease), and the directional air supply of the air inlet fan can realize three-stage filtration of the purified gas: the first filter screen plate intercepts large-particle impurities (such as rust and mechanical debris), the second filter screen plate filters fine dust, and the third airflow carries volatile impurities (such as free acid and moisture) from the exhaust pipe when passing through the material layer.

[0020] 2. In the present disclosure, the output motor drives the rotating sleeve and the push blade, and forms a spiral pushing flow field at the bottom of the kettle. On the one hand, it can uniformly mix the purified material, and on the other hand, it can continuously push the material to the discharge port of the plug-in sleeve, and cooperate with the precise control of the adjusting motor on the angle of the plug-in sleeve. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed in the description of the embodiments of the present disclosure will be briefly introduced. Obviously, the drawings in the following description are only some example embodiments of the present disclosure. Those skilled in the art can obtain other drawings according to the content of the example embodiments of the present disclosure and these drawings without creating any creative labor.

[0022] Figure 1 It is a structural schematic diagram in an embodiment of the present disclosure;

[0023] Figure 2 It is a sectional view of the kettle of the present disclosure;

[0024] Figure 3 It is a sectional view of the plug-in sleeve of the present disclosure;

[0025] Figure 4 It is an axial side view of the plug-in sleeve of the present disclosure;

[0026] In the figure: 1, kettle; 2, feed cover; 3, blow up purification assembly; 3-1, air inlet pipe; 3-2, feed tank; 3-3, exhaust port; 3-4, exhaust pipe; 3-5, bottom plate; 3-6, telescopic air cylinder; 3-7, push rod; 3-8, push block; 3-9, pulley; 4, stirring and discharging assembly; 4-1, discharge port; 4-2, plug-in sleeve; 4-3, dropping port; 4-4, driving port; 4-5, output motor; 4-6, rotating sleeve; 4-7, turning blade; 4-8, motor base; 4-9, adjusting motor; 4-10, driving disc; 5, supporting stand; 6, air inlet fan; 7, filter screen. DETAILED DESCRIPTION

[0027] The present disclosure will be further described in conjunction with the drawings and examples. It can be understood that the specific examples described herein are merely intended to explain the present disclosure, but not to limit the present disclosure.

[0028] In order to make the drawing simple, only the parts related to the disclosure are shown in each figure, which does not represent the actual structure of the product. In addition, in order to make the drawing simple and easy to understand, in some figures, only one of the parts with the same structure or function is shown, or only one of them is marked. In this text, "one" not only means "only one", but also means "more than one", and "several" includes "two" and "more than two".

[0029] In this text, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "mounting", "connection" and "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0030] In the present disclosure, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the indirect contact of the first and second features through another feature between them. Moreover, the "upper", "upper" and "upper" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only means that the horizontal height of the first feature is higher than that of the second feature. The "lower", "lower" and "lower" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only means that the horizontal height of the first feature is less than that of the second feature.

[0031] In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like, orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0032] In addition, in the description of the present application, the terms "first", "second", and the like are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0033] As shown in Figures 1-4 , it shows a purification kettle for succinic anhydride production of the present disclosure, which comprises:

[0034] Kettle 1, the upper end of kettle 1 is provided with a feeding cover 2;

[0035] Blow purification assembly 3, blow purification assembly 3 is arranged in the inside of kettle 1;

[0036] Stirring discharge assembly 4, stirring discharge assembly 4 is arranged at the bottom of kettle 1;

[0037] Blow purification assembly 3 includes air inlet pipe 3-1, air inlet pipe 3-1 is arranged on the side wall of kettle 1, feeding tank 3-2 is arranged in the inside of kettle 1, feeding tank 3-2 is communicated with feeding cover 2, air inlet pipe 3-1 is communicated with feeding tank 3-2, air exhaust port 3-3 is opened on the side wall of feeding tank 3-2, air exhaust pipe 3-4 is arranged on air exhaust port 3-3, air exhaust pipe 3-4 extends out of kettle 1, bottom plate 3-5 is arranged in the inside of feeding tank 3-2, bottom plate 3-5 is hinged connected with feeding tank 3-2.

[0038] Stirring discharge assembly 4 includes discharge port 4-1, discharge port 4-1 is opened at the bottom of kettle 1, plug-in sleeve 4-2 is sleeved on the lower end surface of kettle 1, dropping port 4-3 is arranged on the lower end surface of plug-in sleeve 4-2, dropping port 4-3 corresponds to the position of discharge port 4-1.

[0039] In some examples, the air inlet pipe 3-1 is arranged on the side wall of the kettle 1 and communicates with the feed tank 3-2 inside the kettle 1. When installed, the sealing performance between the air inlet pipe 3-1 and the feed tank 3-2 needs to be ensured. Sealing glue or sealing gasket and the like can be used to prevent gas leakage. During routine maintenance, the filter screen plate 7 needs to be cleaned or replaced regularly to ensure its filtering effect. The feed tank 3-2 communicates with the feed cover 2, so that the succinic anhydride material to be purified can enter the feed tank 3-2. The side wall of the feed tank 3-2 is provided with an exhaust port 3-3. The exhaust pipe 3-4 arranged on the exhaust port 3-3 extends out of the kettle 1. When the air inlet pipe 3-1 introduces gas into the feed tank 3-2, the gas flows in the feed tank 3-2 and contacts with the succinic anhydride material to blow and purify it, blowing away the volatile impurities in the material. These impurity gases are discharged out of the kettle 1 through the exhaust pipe 3-4. The inside of the feed tank 3-2 is provided with a bottom plate 3-5. The bottom plate 3-5 is hingedly connected with the feed tank 3-2. The kettle 1 is inserted with a telescopic air cylinder 3-6. The telescopic end of the telescopic air cylinder 3-6 is provided with a push rod 3-7. The end of the push rod 3-7 is provided with a push block 3-8. The upper end surface of the push block 3-8 is provided with a pulley 3-9. The pulley 3-9 is in close contact with the bottom plate 3-5.

[0040] The discharge port 4-1 is opened at the bottom of the kettle 1. The lower end surface of the kettle 1 is sleeved with a plug-in sleeve 4-2. The lower end surface of the plug-in sleeve 4-2 is provided with a dropping port 4-3. The dropping port 4-3 corresponds to the position of the discharge port 4-1. The purified succinic anhydride material enters the plug-in sleeve 4-2 through the discharge port 4-1 and is discharged from the dropping port 4-3. When the plug-in sleeve 4-2 is installed, it needs to be tightly sleeved with the bottom of the kettle 1 and the dropping port 4-3 needs to be accurately aligned with the discharge port 4-1. Positioning pins and the like can be used for positioning and installation. At the same time, the plug-in sleeve 4-2 needs to be sealingly attached with the side wall of the kettle 1 to prevent material leakage. Sealing glue or sealing ring and the like can be used for sealing measures. During the operation of the equipment, the operating state of the output motor 4-5 and the wear condition of the rotating sleeve 4-6 and the push blade 4-7 need to be checked regularly for timely maintenance or replacement. During adjustment, the adjustment motor 4-9 needs to be operated slowly to observe the adjustment condition of the plug-in sleeve 4-2 to ensure that it is adjusted to the appropriate position. The lower end surface of the plug-in sleeve 4-2 is provided with a support leg 5. The support leg 5 is used to support the entire plug-in sleeve 4-2 and the bottom structure of the kettle 1 to ensure the stability of the equipment during operation.

[0041] As shown in Figures 1-4 The kettle 1 is inserted with a telescopic air cylinder 3-6. The telescopic end of the telescopic air cylinder 3-6 is provided with a push rod 3-7. The end of the push rod 3-7 is provided with a push block 3-8. The upper end surface of the push block 3-8 is provided with a pulley 3-9. The pulley 3-9 is in close contact with the bottom plate 3-5.

[0042] In some examples, when the material in the feed tank 3-2 needs to be dropped to the bottom of the kettle 1, the telescopic cylinder 3-6 is started, the telescopic end of the telescopic cylinder 3-6 pushes the push rod 3-7, the push rod 3-7 drives the push block 3-8 to move, because the pulley 3-9 is in close contact with the bottom plate 3-5, when the push block 3-8 moves, the bottom plate 3-5 is driven to rotate around the hinge by the pulley 3-9, thereby opening the bottom plate 3-5, facilitating cleaning the inside of the feed tank 3-2 and other operations, and after the operation is completed, the telescopic cylinder 3-6 is started in the opposite direction to reset the bottom plate 3-5.

[0043] For example, as shown in Figure 2 The plug-in sleeve 4-2 is provided with a driving opening 4-4, the bottom of the kettle 1 is provided with an output motor 4-5, the output end of the output motor 4-5 is provided with a rotating sleeve 4-6, and the side wall of the rotating sleeve 4-6 is provided with a driving blade 4-7.

[0044] In some examples, the plug-in sleeve 4-2 is provided with a driving opening 4-4, the bottom of the kettle 1 is provided with an output motor 4-5, the output end of the output motor 4-5 is provided with a rotating sleeve 4-6, and the side wall of the rotating sleeve 4-6 is provided with a driving blade 4-7. Start the output motor 4-5, the output motor 4-5 drives the rotating sleeve 4-6 to rotate, the driving blade 4-7 on the side wall of the rotating sleeve 4-6 rotates with it, and the driving blade 4-7 can stir the material entering the plug-in sleeve 4-2 when it rotates in the plug-in sleeve 4-2, preventing the material from accumulating and blocking, and facilitating the material to be discharged more smoothly from the dropping port 4-3.

[0045] For example, as shown in Figure 2 The lower end of the output motor 4-5 is provided with a motor table 4-8, the lower end surface of the motor table 4-8 is provided with an adjusting motor 4-9, the output end of the adjusting motor 4-9 is provided with a driving disc 4-10, and the driving disc 4-10 is fixedly connected with the plug-in sleeve 4-2.

[0046] In some examples, the lower end of the output motor 4-5 is provided with a motor table 4-8, the lower end surface of the motor table 4-8 is provided with an adjusting motor 4-9, the output end of the adjusting motor 4-9 is provided with a driving disc 4-10, and the driving disc 4-10 is fixedly connected with the plug-in sleeve 4-2. When the angle or position of the plug-in sleeve 4-2 needs to be fine-tuned, the adjusting motor 4-9 is started, the adjusting motor 4-9 drives the driving disc 4-10 to rotate, and since the driving disc 4-10 is fixedly connected with the plug-in sleeve 4-2, the angle or position of the plug-in sleeve 4-2 is adjusted to meet different discharge requirements.

[0047] For example, as shown in Figure 1 The lower end surface of the plug-in sleeve 4-2 is provided with a support stand 5, and the plug-in sleeve 4-2 is in close contact with the side wall of the kettle 1.

[0048] In some examples, when installing the support legs 5, it is necessary to ensure that the height is consistent and stable in contact with the ground, which can be measured and adjusted by using a level or the like.

[0049] For example, as shown in Figure 2 The air inlet pipe 3-1 is internally provided with an air inlet fan 6 embedded in the inside of the air inlet pipe 3-1, and a filter screen plate 7 is arranged in the air inlet pipe 3-1.

[0050] In some examples, the air inlet pipe 3-1 is internally provided with an air inlet fan 6 embedded in the inside of the air inlet pipe 3-1, and the air inlet fan 6 can be started to introduce external gas into the feed tank 3-2.

[0051] For example, as shown in Figure 2 The number of filter screen plates 7 is several, and the mesh diameters of the plurality of filter screen plates 7 are arranged in order from large to small.

[0052] In some examples, the air inlet pipe 3-1 is internally provided with several filter screen plates 7, and the mesh diameters of the plurality of filter screen plates 7 are arranged in order from large to small. These filter screen plates 7 can filter the entering gas step by step, remove impurity particles in the gas, and ensure the purity of the gas entering the feed tank 3-2.

[0053] In use, after the succinic anhydride is poured into the inside of the kettle 1 from the feed cover 2, the air inlet fan 6 is started (the air volume is set to 1500 m³ / h), the clean air is filtered through the three-stage filter screen, enters the feed tank 3-2 from the air inlet pipe 3-1, after purification is completed, the air inlet fan 6 is closed, the bottom plate 3-5 of the feed tank 3-2 is opened (the inclination angle is 60°), the material falls into the bottom of the kettle 1 by gravity, the adjusting motor 4-9 is started, the plug-in sleeve 4-2 is rotated to the alignment angle with the discharge port 4-1, and the horizontal degree of the plug-in sleeve 4-2 is adjusted through the adjusting bolt at the bottom of the support leg 5, the output motor 4-5 is started, the rotating sleeve 4-6 drives the stirring vane 4-7 to stir the material at the bottom of the kettle 1, the stirring time is set to 10 minutes to ensure uniform mixing of the material, after the driving disc 4-10 is rotated by the adjusting motor 4-9, the plug-in sleeve 4-2 rotates, the dropping port 4-3 coincides with the discharge port 4-1, and at this time the material is more smoothly discharged from the dropping port 4-3.

[0054] It should be noted that the above examples are only used to illustrate the technical solutions of the present disclosure, not to limit it. Although the present disclosure has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solutions of the present disclosure can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the present disclosure, which should be covered in the scope of the claims of the present disclosure.

Claims

1. A purification tank for succinic anhydride production, characterized by comprising: Include: Pot (1), the upper end of the kettle (1) is provided with a feed cover (2); Blow up purification assembly (3), the blow up purification assembly (3) is arranged in the inside of the kettle (1); Stirring discharge assembly (4), the stirring discharge assembly (4) is arranged at the bottom of the kettle (1); The blow up purification assembly (3) includes air inlet pipe (3-1), the air inlet pipe (3-1) is arranged in the side wall of the kettle (1), the inside of the kettle (1) is provided with feed tank (3-2), the feed tank (3-2) is communicated with the feed cover (2), the air inlet pipe (3-1) is communicated with the feed tank (3-2), the side wall of the feed tank (3-2) is provided with exhaust port (3-3), the exhaust port (3-3) is provided with exhaust pipe (3-4), the exhaust pipe (3-4) extends out of the kettle (1), the inside of the feed tank (3-2) is provided with bottom plate (3-5), the bottom plate (3-5) is hinged connected with the feed tank (3-2).

2. The purification kettle for succinic anhydride production according to claim 1, characterized in that, The kettle (1) is inserted with telescopic air cylinder (3-6), the telescopic end of the telescopic air cylinder (3-6) is provided with push rod (3-7), the end of the push rod (3-7) is provided with push block (3-8), the upper end surface of the push block (3-8) is provided with pulley (3-9), the pulley (3-9) is attached to the bottom plate (3-5).

3. The purification kettle for succinic anhydride production according to claim 1, characterized in that, The stirring discharge assembly (4) includes discharge port (4-1), the discharge port (4-1) is opened in the bottom of the kettle (1), the lower end surface of the kettle (1) is sleeved with plug-in sleeve (4-2), the lower end surface of the plug-in sleeve (4-2) is provided with dropping port (4-3), the dropping port (4-3) corresponds to the position of the discharge port (4-1).

4. The purification kettle for succinic anhydride production according to claim 3, characterized in that, The plug-in sleeve (4-2) is provided with driving port (4-4), the bottom of the kettle (1) is provided with output motor (4-5), the output end of the output motor (4-5) is provided with rotating sleeve (4-6), the side wall of the rotating sleeve (4-6) is provided with push blade (4-7).

5. The purification kettle for succinic anhydride production according to claim 4, characterized in that, The lower end of the output motor (4-5) is provided with motor table (4-8), the lower end surface of the motor table (4-8) is provided with adjusting motor (4-9), the output end of the adjusting motor (4-9) is provided with driving disc (4-10), the driving disc (4-10) is fixedly connected with the plug-in sleeve (4-2).

6. The purification kettle for succinic anhydride production according to claim 3, characterized in that, The lower end surface of the plug-in sleeve (4-2) is provided with support stand (5), the plug-in sleeve (4-2) is sealingly attached to the side wall of the kettle (1).

7. The purification kettle for succinic anhydride production according to claim 1, characterized in that, The inside of the air inlet pipe (3-1) is provided with air inlet fan (6), the air inlet fan (6) is embedded in the inside of the air inlet pipe (3-1), the air inlet pipe (3-1) is provided with filter screen plate (7).

8. The purification kettle for succinic anhydride production according to claim 7, characterized in that, The number of filter screen plates (7) is several, the mesh diameters of the plurality of filter screen plates (7) are arranged from large to small in turn.

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