Stirring and filtering device for preparing p-tert-butylbenzoic acid

Abstract

The invention discloses a stirring and filtering device for preparing p-tert-butylbenzoic acid. The stirring and filtering device comprises a reaction kettle, a transmission mechanism, a filtering mechanism and a stirring mechanism, the reaction kettle comprises a first-section kettle body, a second-section kettle body and a third-section kettle body; the transmission mechanism drives the stirring mechanism to rotate; the filtering mechanisms are arranged at the two ends of the three-section kettle body; the stirring mechanism comprises a first stirring assembly and a second stirring assembly; the first stirring assembly is used for mixing methylbenzene and a p-tert-butylbenzoic acid crude product, a first decolorizing substance is arranged in the second-section kettle body and is used for carrying out primary decolorization on a p-tert-butylbenzoic acid crude product solution, a second decolorizing substance is arranged in the second stirring assembly, and the transmission mechanism drives the second decolorizing substance to stir the p-tert-butylbenzoic acid crude product solution, so that the p-tert-butylbenzoic acid crude product solution is obtained. And carrying out secondary decolorization. According to the method, the stirring process and the filtering process are combined into one process, and the first decolorizing substance and the second decolorizing substance are used for decolorizing while stirring is performed, so that the decolorizing effect is improved, and the preparation efficiency of the p-tert-butylbenzoic acid crude product solution is also improved.

Description

Technical Field

[0001] The present invention relates to the technical field of stirring and mixing, and particularly relates to a stirring and filtering device for the preparation of p-tert-butylbenzoic acid. Background Art

[0002] P-tert-butylbenzoic acid is a colorless needle-shaped crystal or crystalline powder, and is an important organic synthesis intermediate, which is widely used in industries such as chemical synthesis, cosmetics, flavor and fragrance, etc. For example, it can be used as an improver for producing alkyd resin, cutting oil, lubricating oil additive, food preservative, and stabilizer for polyethylene.

[0003] Currently, in the process of preparing p-tert-butylbenzoic acid, after dissolving the crude p-tert-butylbenzoic acid with toluene, a stirring device is used to promote its dissolution, and then activated carbon and diatomaceous earth are added thereto to decolorize the crude p-tert-butylbenzoic acid solution. Finally, the crude p-tert-butylbenzoic acid solution mixed with activated carbon and diatomaceous earth is passed through a sieve mesh with sieve holes to filter the activated carbon and diatomaceous earth, and then a p-tert-butylbenzoic acid solution is obtained.

[0004] However, the existing stirring device and filtering device are two processes, which makes the preparation process of p-tert-butylbenzoic acid solution time-consuming. Due to the different diameters of activated carbon and diatomaceous earth, the filtering effects on both are not good. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a stirring and filtering device for the preparation of p-tert-butylbenzoic acid, aiming to solve the problems that the existing stirring device and filtering device are two processes, which makes the preparation process of p-tert-butylbenzoic acid solution time-consuming. Due to the different diameters of activated carbon and diatomaceous earth, the filtering effects on both are not good.

[0006] To achieve the above purpose, the present invention is realized through the following technical solutions: A stirring and filtering device for the preparation of p-tert-butylbenzoic acid, the stirring and filtering device for the preparation of p-tert-butylbenzoic acid includes a reaction kettle, a transmission mechanism arranged on the reaction kettle and a filtering mechanism, and a stirring mechanism arranged on the transmission mechanism;

[0007] The reaction kettle includes a first-stage kettle body, a second-stage kettle body, and a third-stage kettle body;

[0008] The transmission mechanism penetrates through the first-stage kettle body, the second-stage kettle body, and the third-stage kettle body along the length direction of the reaction kettle, and drives the stirring mechanism to rotate;

[0009] The filtering mechanism is arranged at both ends of the third-stage kettle body;

[0010] The stirring mechanism includes a first stirring component arranged in the first-stage kettle body, and a second stirring component arranged in the third-stage kettle body;

[0011] Among them, the first stirring component is used to mix toluene and crude p-tert-butylbenzoic acid. A first decolorizing substance is provided in the second-stage kettle body to perform primary decolorization on the crude p-tert-butylbenzoic acid solution. A second decolorizing substance is provided in the second stirring component. The transmission mechanism drives the second decolorizing substance to stir in the crude p-tert-butylbenzoic acid solution after primary decolorization for secondary decolorization.

[0012] In summary, a stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to the present invention. By setting a first stirring component in the first-stage kettle body and driving the first stirring component to rotate through a stirring mechanism, the toluene solution added from the first-stage kettle body is fully mixed with the crude p-tert-butylbenzoic acid. Then, the obtained crude p-tert-butylbenzoic acid solution is transported to the second-stage kettle body for primary decolorization by the first decolorizing substance, and is subjected to primary filtration by a filtering mechanism provided between the first-stage kettle body and the second-stage kettle body to leave the first decolorizing substance in the second-stage kettle body. The transmission mechanism drives the second stirring component to rotate in the third-stage kettle body. By driving the second stirring component to revolve and rotate, the second decolorizing substance in the second stirring component is fully brought into contact with and stirred in the crude p-tert-butylbenzoic acid solution after primary filtration for secondary decolorization. Finally, secondary filtration is performed through the filtering mechanism at the bottom of the third-stage kettle body to obtain the crude p-tert-butylbenzoic acid solution after secondary decolorization for subsequent processing. This application combines the stirring process and the filtering process into one process, and uses the first decolorizing substance and the second decolorizing substance for decolorization while stirring, improving the decolorization effect and also improving the preparation efficiency of the crude p-tert-butylbenzoic acid solution.

[0013] According to one aspect of the above technical solution, the transmission mechanism includes a transmission member provided at one end of the first-stage kettle body away from the second-stage kettle body, and a transmission shaft passing through the reaction kettle. The transmission member drives the transmission shaft to drive the first stirring component and the second stirring component to rotate.

[0014] According to one aspect of the above technical solution, the first stirring component includes a first rotating member sleeved on the transmission shaft and a plurality of stirring fan blades provided on the first rotating member. The stirring fan blades rotate following the first rotating member.

[0015] According to one aspect of the above technical solution, the second stirring component includes a second rotating member and a stirring bracket rotatably connected to the second rotating member. The second rotating member drives the stirring bracket to revolve around the transmission shaft.

[0016] According to one aspect of the above technical solution, a connecting bushing is provided between the stirring bracket and the second rotating member. One end of the connecting bushing is sleeved on the second rotating member, and the other end is connected to the stirring bracket through a transmission bearing.

[0017] According to one aspect of the above technical solution, the stirring bracket includes a bracket body, a connecting rod disposed on the bracket body, and a plurality of accommodating cylinders symmetrically penetrating through both sides of the bracket body. A plurality of through holes are provided on the cylinder wall of the accommodating cylinder, and the accommodating cylinder is used to contain the second decolorizing substance.

[0018] According to one aspect of the above technical solution, the connecting rod is connected to the transmission shaft through a transmission belt to drive the stirring bracket to rotate self - clockwise.

[0019] According to one aspect of the above technical solution, the filtering mechanism is a sieve net disposed at both ends of the three - section kettle body.

[0020] According to one aspect of the above technical solution, an observation window is further opened on the three - section kettle body, and the observation window is movably connected to the three - section kettle body for switching between the open and closed states.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present invention. Description of the Drawings

[0022] Figure 1 It is a schematic structural diagram of a stirring and filtering device for the preparation of p - tert - butylbenzoic acid in an embodiment of the present invention;

[0023] Figure 2 It is a view of the open state of the observation window of the stirring and filtering device for the preparation of p - tert - butylbenzoic acid in an embodiment of the present invention;

[0024] Figure 3 A cross - sectional view of the stirring and filtering device for the preparation of p - tert - butylbenzoic acid in an embodiment of the present invention.

[0025] Explanation of the symbols of the components in the drawings:

[0026] Reaction kettle 100, first - stage kettle body 110, first feeding port 111, second feeding port 112, second - stage kettle body 120, observation window 121, third - stage kettle body 130, transmission mechanism 200, transmission part 210, transmission shaft 220, filtering mechanism 300, stirring mechanism 400, first stirring component 410, first rotating part 411, stirring fan blades 412, second stirring component 420, second rotating part 421, stirring bracket 422, bracket body 423, connecting rod 424, accommodating cylinder 425, transmission belt 426, connecting bushing 427, valve 500. Detailed Embodiments

[0027] To facilitate the understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present invention more thorough and comprehensive.

[0028] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0030] Please refer to Figures 1 - 3 , which shows a schematic structural diagram of a stirring and filtering device for the preparation of p-tert-butylbenzoic acid provided in an embodiment of the present invention. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid includes a reaction kettle 100, a transmission mechanism 200 provided on the reaction kettle 100, a filtering mechanism 300, and a stirring mechanism 400 provided on the transmission mechanism 200, wherein:

[0031] In order to improve the mixing degree of p-tert-butylbenzoic acid, as well as the filter residue and decolorization effect, the reaction kettle 100 of the present application includes a first-stage kettle body 110, a second-stage kettle body 120, and a third-stage kettle body 130. The first-stage kettle body 110 is used to stir the mixing degree of toluene solution and p-tert-butylbenzoic acid crude product, and a first feeding port 111 and a second feeding port 112 are respectively provided on both sides of the transmission mechanism 200 outside the first-stage kettle body 110 for respectively feeding toluene solution and p-tert-butylbenzoic acid crude product into the first-stage kettle body 110. When the toluene solution and p-tert-butylbenzoic acid crude product are fed into the first-stage kettle body 110, the transmission mechanism 200 drives the stirring mechanism 400 to stir to fully mix the toluene solution and p-tert-butylbenzoic acid crude product.

[0032] In order to fully mix the toluene solution and the crude p-tert-butylbenzoic acid, a transmission mechanism 200 is provided outside the first-stage kettle body 110, and a stirring mechanism 400 is provided inside the reaction kettle 100. The stirring mechanism 400 further includes a first stirring assembly 410 disposed in the first-stage kettle body 110 and a second stirring assembly 420 disposed in the third-stage kettle body 130. The transmission mechanism 200 includes a transmission member 210 disposed at one end of the first-stage kettle body 110 away from the second-stage kettle body 120, and a transmission shaft 220 connecting the transmission member 210 and passing through the first-stage kettle body 110, the second-stage kettle body 120, and the third-stage kettle body 130. The transmission shaft 220 can drive the first stirring assembly 410 and the second stirring assembly 420 to rotate.

[0033] It should be noted that the first stirring assembly 410 further includes a first rotating member 411 sleeved on the transmission shaft 220, and a plurality of stirring fan blades 412 disposed on the first rotating member 411. The transmission member 210 drives the transmission shaft 220 to rotate, and then drives the first rotating member 411 to rotate, so that the stirring fan blades 412 stir the toluene solution, so that the toluene solution and the crude p-tert-butylbenzoic acid are fully mixed.

[0034] In order to prevent the solution from entering the second-stage kettle body 120 when the toluene solution and the crude p-tert-butylbenzoic acid are fully mixed, a first valve 500 is further provided between the first-stage kettle body 110 and the second-stage kettle body 120. When the toluene solution and the crude p-tert-butylbenzoic acid are mixed by the first stirring assembly 410, the first valve 500 is in a closed state, and it is not until the crude p-tert-butylbenzoic acid is dissolved that the first valve 500 is opened to allow the crude p-tert-butylbenzoic acid solution to enter the second-stage kettle body 120 for decolorization and filtration.

[0035] Further, the second-stage kettle body 120 is used to accommodate the first decolorized substance. In this embodiment, the first decolorized substance can be diatomaceous earth. Since diatomaceous earth has a certain physical adsorption effect and can adsorb impurities such as pigments, the purpose of decolorization can be achieved. Since a filtering mechanism 300 is provided between the second-stage kettle body 120 and the third-stage kettle body 130, the diatomaceous earth is placed on the filtering mechanism 300 between the second-stage kettle body 120 and the third-stage kettle body 130. The filtering mechanism 300 in this embodiment is a sieve mesh provided at both ends of the third-stage kettle body 130. The filtering bracket is clamped on the third-stage kettle body 130 and is rotatably connected to the third-stage kettle body 130. Since diatomaceous earth is a natural filtering material and its particle size is usually small, a sieve mesh with a sieve hole diameter smaller than that of diatomaceous earth can be used for filtering. When a large amount of crude p-tert-butylbenzoic acid solution in the first-stage kettle body 110 enters the second-stage kettle body 120, the sieve mesh is extremely small, so a large amount of crude p-tert-butylbenzoic acid solution will remain in the second-stage kettle body 120 and be slowly filtered to perform primary decolorization through diatomaceous earth. At the same time, if there are certain impurities during the dissolution process of crude p-tert-butylbenzoic acid and toluene solution, they can also be filtered out through the sieve mesh to obtain the crude p-tert-butylbenzoic acid solution after primary filtration.

[0036] Furthermore, the second decolorized substance is used in the third-stage kettle body 130 for the second stirring assembly 420 to perform secondary filtration on the crude p-tert-butylbenzoic acid solution after primary filtration. The second stirring assembly 420 includes a second rotating member 421 sleeved on the transmission shaft 220 and a stirring bracket 422 rotatably connected to the second rotating member 421. In order to drive the stirring bracket 422 to rotate, connecting bushings 427 are provided on both sides of the second rotating member 421. One end of the connecting bushing 427 is provided on the second rotating member 421, and the other end is supported by a transmission shaft 220 provided therein for connecting the stirring bracket 422.

[0037] In order to connect the second rotating member 421, the stirring bracket 422 includes a bracket body 423, a connecting rod 424 provided on the bracket body 423, and a plurality of receiving cylinders 425 symmetrically provided on the bracket body 423. One end of the connecting rod 424 is connected to the transmission shaft 220 support, so that the second rotating member 421 can drive the stirring bracket 422 to rotate around the transmission shaft 220, thereby stirring the crude p-tert-butylbenzoic acid solution after primary filtration.

[0038] In order to further improve the stirring effect, the present application proposes that the stirring bracket 422 can rotate around the transmission shaft 220 under the drive of the second rotating member 421 while the stirring bracket 422 rotates itself. Since one end of the connecting rod 424 is arranged in the bearing of the transmission shaft 220, a transmission belt 426 is also arranged between the transmission shaft 220 and the connecting rod 424. When the transmission shaft 220 rotates and drives the second rotating member 421 to drive the stirring bracket 422 to revolve, the transmission shaft 220 also drives the stirring bracket 422 to rotate itself through the transmission belt 426, thereby improving the stirring effect.

[0039] For the purpose of secondary decolorization, a second decolorizing substance is contained in the receiving cylinder 425. In this embodiment, the second decolorizing substance is activated carbon. Based on its porous structure and large specific surface area, activated carbon can adsorb pigment molecules in the solution, thereby achieving the decolorization effect. Therefore, a plurality of through holes can be provided on the wall of the receiving cylinder 425 so that when the stirring bracket 422 revolves and rotates itself, the second decolorizing substance in the receiving cylinder 425 can fully contact the crude p-tert-butylbenzoic acid solution after primary decolorization. Coupled with the stirring effect of revolution and rotation, the decolorization effect of the second decolorizing substance is greatly improved.

[0040] It should be emphasized that since there is also a filtering mechanism 300 at the bottom of the three-section kettle body 130, and in order to strengthen the secondary decolorization effect, a second valve 500 is also provided at the bottom of the three-section kettle body 130 so that the crude p-tert-butylbenzoic acid solution after primary filtration can fully pass through the second stirring assembly 420 and use the second decolorizing substance for secondary decolorization.

[0041] In addition, an observation window 121 is also opened on the three-section kettle body 130. The observation window 121 is movably connected to the three-section kettle body 130 for switching between the open and closed states. And when the observation window 121 is in the closed state, a sealing edge is provided at the connection between it and the three-section kettle body 130 to prevent the solution from flowing out. When it is necessary to replace the first decolorizing substance and the second decolorizing substance, just open the observation window 121, flush the used first decolorizing substance out with clean water, or directly replace the screen to clean the first stirring assembly 410; for the second stirring assembly 420, just rotate the stirring bracket 422 to the position of the observation window 121, remove the receiving cylinder 425 on the stirring bracket 422, and replace the unused second decolorizing substance prepared in advance. It is worth noting that enough space needs to be reserved between the stirring assembly and the filtering assembly between the two-section kettle body 120 and the three-section kettle body 130 for taking and placing the receiving cylinder 425 to replace the second decolorizing substance.

[0042] In summary, a stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to the present invention is provided. By arranging a first stirring component in the first-stage kettle body and driving the first stirring component to rotate through a stirring mechanism, the toluene solution added from the first-stage kettle body is fully mixed with the crude p-tert-butylbenzoic acid, and then the obtained crude p-tert-butylbenzoic acid solution is transported to the second-stage kettle body for primary decolorization with the first decolorizing agent and primary filtration through a filtering mechanism arranged between the first-stage kettle body and the second-stage kettle body, so that the first decolorizing agent remains in the second-stage kettle body. The transmission mechanism drives the second stirring component to rotate in the third-stage kettle body. By driving the second stirring component to revolve and rotate, the second decolorizing agent in the second stirring component is fully contacted and stirred with the crude p-tert-butylbenzoic acid solution after primary filtration for secondary decolorization. Finally, secondary filtration is carried out through the filtering mechanism at the bottom of the third-stage kettle body to obtain the crude p-tert-butylbenzoic acid solution after secondary decolorization for subsequent processing. This application combines the stirring process and the filtering process into one process, and uses the first decolorizing agent and the second decolorizing agent for decolorization while stirring, improving the decolorization effect and the preparation efficiency of the crude p-tert-butylbenzoic acid solution.

[0043] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0044] The above-described embodiments merely represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A stirring and filtering device for the preparation of p-tert-butylbenzoic acid, characterized in that, The stirring and filtering device for the preparation of p-tert-butylbenzoic acid includes a reaction kettle, a transmission mechanism and a filtering mechanism provided on the reaction kettle, and a stirring mechanism provided on the transmission mechanism; The reaction kettle includes a first-stage kettle body, a second-stage kettle body, and a third-stage kettle body; The transmission mechanism is disposed through the first-stage kettle body, the second-stage kettle body, and the third-stage kettle body along the length direction of the reaction kettle, and drives the stirring mechanism to rotate; The filtering mechanism is disposed at both ends of the third-stage kettle body; The stirring mechanism includes a first stirring assembly disposed in the first-stage kettle body and a second stirring assembly disposed in the third-stage kettle body; Among them, the first stirring assembly is used to mix toluene and crude p-tert-butylbenzoic acid. A first decolorizing agent is provided in the second-stage kettle body to perform primary decolorization on the crude p-tert-butylbenzoic acid solution. A second decolorizing agent is provided in the second stirring assembly. The transmission mechanism drives the second decolorizing agent to stir the crude p-tert-butylbenzoic acid solution after primary decolorization to perform secondary decolorization.

2. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 1, wherein, The transmission mechanism includes a transmission member disposed at one end of the first-stage kettle body away from the second-stage kettle body and a transmission shaft penetrating into the reaction kettle. The transmission member drives the transmission shaft to drive the first stirring assembly and the second stirring assembly to rotate.

3. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 1, wherein, The first stirring assembly includes a first rotating member sleeved on the transmission shaft and several stirring fan blades disposed on the first rotating member. The stirring fan blades rotate following the first rotating member.

4. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 1, characterized in that, The second stirring assembly includes a second rotating member and a stirring support rotatably connected to the second rotating member. The second rotating member drives the stirring support to revolve around the transmission shaft.

5. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 4, characterized in that, A connecting bush is provided between the stirring support and the second rotating member. One end of the connecting bush is disposed on the second rotating member, and the other end is connected to the stirring support through a transmission bearing.

6. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 5, characterized in that, The stirring support includes a support body, a connecting rod disposed on the support body, and several accommodating cylinders symmetrically penetrating through the support body. A plurality of through holes are provided on the cylinder wall of the accommodating cylinder, and the accommodating cylinder is used to contain the second decolorizing agent.

7. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 6, wherein The connecting rod is connected to the transmission shaft through a transmission belt to drive the stirring support to rotate self.

8. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 1, characterized in that, The filtering mechanism is a sieve disposed at both ends of the third-stage kettle body.

9. The stirring and filtering device for the preparation of p-tert-butylbenzoic acid according to claim 8, characterized in that, An observation window is further opened on the third-stage kettle body. The observation window is movably connected to the third-stage kettle body to be used for switching between the open and closed states.

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