A salicylic acid production acid precipitation reaction device

Abstract

The utility model provides a kind of acid precipitation reaction device for salicylic acid production, it is related to chemical production equipment technical field, including reaction tank, the top of the reaction tank is fixedly connected with top cover, the top right side of the top cover is equipped with the feed inlet that passes up and down, the bottom right side of the reaction tank is fixedly connected with collecting tube.The utility model after acid precipitation reaction is completed, precipitate falls into the storage tank in left side, first motor is started at this time, its drive rotating disc rotates, drives the storage tank position of left and right sides to be transposed, the storage tank with precipitate is rotated to right side and is aligned with collecting tube, precipitate falls into collecting box by gravity, simultaneously, empty storage tank is rotated to left side and is aligned with the bottom of conical precipitation area, and new precipitate is received, so circulation realizes the sustained automatic separation of precipitate and supernatant, greatly reduces labor intensity, shortens production cycle, and avoids impurity introduction, significantly improves separation efficiency and product quality.

Description

Technical Field

[0001] This utility model relates to the field of chemical production equipment technology, and in particular to an acid precipitation reaction device for salicylic acid production. Background Technology

[0002] Salicylic acid, also known as o-hydroxybenzoic acid, is an important fine chemical raw material with wide applications in pharmaceuticals, dyes, and fragrances. In the pharmaceutical field, it is an important intermediate in the preparation of drugs such as aspirin and sodium salicylate; in the dye industry, it can be used to synthesize acid dyes; and in the fragrance industry, it can be used as a raw material for the preparation of fragrances.

[0003] In the production process of salicylic acid, acid precipitation reaction is one of the key steps. The acid precipitation reaction device is used to precipitate salicylic acid in the form of a precipitate by adding an acidic substance to the salicylate solution. Through the acid precipitation reaction, the salicylate dissolved in the solution can be converted into solid salicylic acid, which facilitates subsequent separation and purification operations.

[0004] The existing acid precipitation reaction device for salicylic acid production has the following shortcomings:

[0005] Traditional acid precipitation reaction devices often use a single stirring blade, resulting in a fixed mixing path and difficulty in achieving omnidirectional agitation. This leads to insufficient mixing of the acid and salicylate solution, low salicylic acid precipitation efficiency, and significant differences in crystal particle size, affecting product purity and quality. Furthermore, the precipitation separation in traditional devices relies on manual transfer to centrifuges or filtration equipment. After the acid precipitation reaction is completed, the separation of the precipitate and supernatant is cumbersome, not only consuming a lot of manpower and prolonging the production cycle, but also easily introducing external impurities during the transfer process, reducing product quality. In addition, traditional devices lack an automatic circulation separation mechanism, making it impossible to continuously and efficiently complete the separation of precipitate and supernatant, further limiting the improvement of production efficiency. Utility Model Content

[0006] This invention proposes an acid precipitation reaction device for salicylic acid production. Through innovative design of an automatic circulation separation structure and a multi-dimensional stirring structure, it achieves efficient separation of precipitate and supernatant, enhances solution stirring and mixing effect, and improves salicylic acid precipitation efficiency and product quality, thereby solving the problems mentioned in the background art.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an acid precipitation reaction device for salicylic acid production, comprising a reaction vessel, a top cover fixedly connected to the top of the reaction vessel, a feed inlet extending vertically through the top right side of the top cover, a collection pipe fixedly connected to the bottom right side of the reaction vessel, and a stirring assembly fixedly connected to the middle of the top cover.

[0008] The bottom of the reaction vessel is provided with a conical sedimentation zone, and the bottom end of the conical sedimentation zone is provided with a connecting groove. A rotating disk is rotatably connected to the inner surface of the connecting groove. The left and right sides of the rotating disk are provided with vertically penetrating accumulation grooves. The top of the left accumulation groove is connected to the bottom of the conical sedimentation zone, and the bottom of the right accumulation groove is connected to the top of the collection pipe.

[0009] Preferably, a first motor is fixedly connected to the bottom center of the reaction vessel, and the output shaft of the first motor passes through the interior of the connecting groove and is fixedly connected to the bottom center of the rotating disk.

[0010] Preferably, a drain pipe is fixedly connected to the bottom left side of the reaction vessel, and a flow valve is fixedly connected to the middle of the drain pipe.

[0011] Preferably, the top end of the drain pipe extends to the bottom end of the left accumulation tank and is fixedly connected to a filter plate.

[0012] Preferably, a liquid collection box is slidably inserted into the bottom right side of the outer surface of the collection tube, a collection box is slidably inserted into the top right side of the outer surface of the collection tube, and a filter plate is fixedly connected to the bottom of the collection box.

[0013] Preferably, the stirring assembly includes a second motor, which is fixedly connected to the top center of the top cover. The top cover has a movable groove in the middle, and the output shaft of the second motor passes through the interior of the movable groove and is fixedly connected to a drive wheel.

[0014] Preferably, the outer surface of the driving wheel is connected to four driven wheels in a ring array, and the bottom of each driven wheel is fixedly connected to a spline shaft.

[0015] Preferably, the bottom end of the spline shaft extends to the bottom of the top cover and a spline shaft sleeve is slidably connected to its outer surface, and a stirring blade is fixedly connected to the bottom end of the outer surface of the spline shaft sleeve.

[0016] Preferably, a cross bracket is rotatably engaged at the top of the outer surface of the four spline bushings, and a clamping spring is fixedly connected to the top of the cross bracket, with the top of the clamping spring fixedly connected to the lower surface of the top cover.

[0017] Preferably, a connecting column is fixedly connected to the bottom center of the drive wheel, the bottom end of the connecting column extends through to the lower surface of the cross bracket and is fixedly connected to a rotating plate, and both ends of the top of the rotating plate are fixedly connected to protrusions.

[0018] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0019] 1. In this utility model, through the cooperation of the conical sedimentation zone, rotating disk, accumulation tank, first motor, collection pipe, collection box, liquid collection box and filter plate two, after the acid precipitation reaction is completed, the precipitate will accumulate at the bottom of the conical sedimentation zone due to gravity and fall into the accumulation tank on the left. At this time, the first motor is started, which drives the rotating disk to rotate, causing the positions of the accumulation tanks on the left and right sides to be reversed. The accumulation tank containing the precipitate rotates to the right side and aligns with the collection pipe. The precipitate falls into the collection box by gravity. The liquid mixed in it flows into the liquid collection box through the filter plate two. At the same time, the empty accumulation tank rotates to the left side and aligns with the bottom of the conical sedimentation zone to receive new precipitate. This cycle realizes the continuous automatic separation of precipitate and supernatant. After the precipitate is completely discharged, the guide valve is opened to quickly discharge the remaining supernatant in the reaction tank. The whole process does not require manual transfer, which greatly reduces labor intensity, shortens the production cycle, avoids the introduction of impurities, and significantly improves separation efficiency and product quality.

[0020] 2. In this utility model, through the mutual cooperation of a second motor, a driving wheel, a driven wheel, a splined shaft, a splined bushing, a stirring blade, a cross bracket, a clamping spring, a connecting column, a rotating plate, and a protrusion, after the second motor is started, the driving wheel drives the four driven wheels to rotate synchronously. The splined shaft drives the corresponding splined bushing and stirring blade to rotate, and multiple stirring blades work simultaneously, greatly improving the stirring efficiency. At the same time, the rotation of the driving wheel drives the connecting column, rotating plate, and protrusion to rotate. The protrusion periodically pushes the cross bracket to slide upward, driving the four splined bushings to rise synchronously. After the protrusion rotates open, under the action of the clamping spring, the cross bracket and splined bushing descend to reset, realizing the stirring blade's up-and-down reciprocating stirring. This stirring method, which combines horizontal rotation and vertical reciprocating, forms a multi-dimensional stirring effect, allowing the solution to be fully mixed in the reaction vessel, significantly accelerating the precipitation rate of salicylic acid, ensuring uniform crystal particles, and effectively improving the purity and quality of the product. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the acid precipitation reaction apparatus for the production of salicylic acid according to this utility model;

[0022] Figure 2 This is a cross-sectional top view of the reaction vessel of this utility model;

[0023] Figure 3 This is a cross-sectional bottom view of the reaction vessel of this utility model;

[0024] Figure 4 This is a cross-sectional structural diagram of the stirring assembly of this utility model;

[0025] Figure 5 This is an enlarged structural schematic diagram of the stirring assembly of this utility model.

[0026] Legend: 1. Reaction vessel; 11. Conical sedimentation zone; 12. Connecting groove; 13. Rotating disc; 14. Accumulation tank; 15. Filter plate one; 16. First motor; 17. Drain pipe; 18. Conductive valve; 2. Top cover; 3. Inlet; 4. Collection pipe; 41. Collection box; 42. Collection box; 43. Filter plate two; 5. Stirring assembly; 51. Second motor; 52. Drive wheel; 53. Driven wheel; 54. Splined shaft; 55. Splined bushing; 56. Stirring blade; 57. Cross support; 58. Connecting column; 59. Tightening spring; 510. Rotating plate; 511. Protrusion. Detailed Implementation

[0027] To better understand the above-mentioned objectives, features, and advantages of this utility model, the present utility model will be further described below with reference to the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0028] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the present invention is not limited to the specific embodiments disclosed in the following specification.

[0029] Example 1: As Figure 1 , Figure 2 and Figure 3 As shown, this utility model provides a technical solution: It includes a reaction vessel 1, a top cover 2 fixedly connected to the top of the reaction vessel 1, a through-feed inlet 3 on the right side of the top of the top cover 2, a collection pipe 4 fixedly connected to the right side of the bottom of the reaction vessel 1, a stirring assembly 5 fixedly connected to the middle of the top cover 2, a conical sedimentation zone 11 at the bottom of the reaction vessel 1, a connecting groove 12 at the bottom end of the conical sedimentation zone 11, a rotating disk 13 rotatably connected to the inner surface of the connecting groove 12, and accumulation troughs 14 through-feeding on both the left and right sides of the rotating disk 13. The top of the left accumulation trough 14 is connected to the bottom of the conical sedimentation zone 11, and the right accumulation trough 14... The bottom and the top of the collection pipe 4 are interconnected. The first motor 16 is fixedly connected to the middle of the bottom of the reaction tank 1. The output shaft of the first motor 16 passes through the inside of the connecting groove 12 and is fixedly connected to the bottom center of the rotating disk 13. The bottom left side of the reaction tank 1 is fixedly connected to the drain pipe 17. The middle of the drain pipe 17 is fixedly connected to the control valve 18. The top of the drain pipe 17 passes through the bottom of the left accumulation tank 14 and is fixedly connected to the filter plate 15. The bottom right side of the outer surface of the collection pipe 4 is slidably inserted into the collection box 41. The top right side of the outer surface of the collection pipe 4 is slidably inserted into the collection box 42. The bottom of the collection box 42 is fixedly connected to the filter plate 43.

[0030] The overall effect of Example 1 is as follows: it realizes the automated and cyclical separation of precipitate and supernatant. After the acid precipitation reaction is completed, the salicylic acid precipitate naturally settles to the bottom of the conical precipitation zone 11 under the action of gravity and is collected through the left accumulation tank 14. The first motor 16 is started to drive the rotating disk 13 to rotate, so that the positions of the left and right accumulation tanks 14 are interchanged. The accumulation tank 14 containing precipitate is rotated to the right side. The precipitate falls into the collection box 42 through the collection pipe 4 by gravity. The mixed liquid flows into the collection box 41 through the filter plate 43, completing one separation. The empty accumulation tank 14 is rotated to the left side to continue to receive new precipitate. This cycle continues until the precipitate is completely separated. Then the guide valve 18 is opened and the remaining supernatant is discharged through the drain pipe 17. The whole process does not require manual intervention, effectively improving separation efficiency and product purity, and reducing labor intensity and production cycle.

[0031] Example 2: Figure 4 and Figure 5 As shown, this utility model provides a technical solution: the stirring assembly 5 includes a second motor 51, which is fixedly connected to the top center of the top cover 2. A movable groove is provided in the middle of the top cover 2. The output shaft of the second motor 51 passes through the interior of the movable groove and is fixedly connected to a driving wheel 52. Four driven wheels 53 are meshed in a ring array on the outer surface of the driving wheel 52. A splined shaft 54 ​​is fixedly connected to the bottom of the driven wheels 53. The bottom end of the splined shaft 54 ​​passes through the bottom of the top cover 2 and a splined shaft sleeve 55 is slidably connected to its outer surface. A stirring blade 56 is fixedly connected to the bottom of the outer surface of the spline bushing 55. A cross bracket 57 is rotatably snapped onto the top of the outer surface of the four spline bushings 55. A clamping spring 59 is fixedly connected to the top of the cross bracket 57. The top of the clamping spring 59 is fixedly connected to the lower surface of the top cover 2. A connecting post 58 is fixedly connected to the bottom center of the drive wheel 52. The bottom end of the connecting post 58 extends through to the lower surface of the cross bracket 57 and is fixedly connected to a rotating plate 510. Both ends of the top of the rotating plate 510 are fixedly connected to protrusions 511.

[0032] The overall effect of Embodiment 2 is as follows: a multi-dimensional and efficient stirring system is constructed. When the second motor 51 is started, the drive wheel 52 drives the four driven wheels 53 to rotate synchronously. The spline shaft 54 ​​drives the spline bushing 55 and the stirring blades 56 to perform horizontal rotation stirring. Multiple stirring blades 56 work together to increase the stirring range and mixing force of the solution. At the same time, when the drive wheel 52 rotates, the connecting column 58 drives the rotating plate 510 and the protrusion 511 to rotate. The protrusion 511 periodically pushes the cross bracket 57 to slide upward, compressing the clamping spring 59, which drives the spline bushing 55 and the stirring blades 56 to rise. When the protrusion 511 rotates out, the clamping spring 59 resets and pushes the cross bracket 57 and the spline bushing 55 to descend, realizing the up-and-down reciprocating motion of the stirring blades 56. The stirring method, which combines horizontal rotation and vertical reciprocating motion, makes the solution form a complex convection path in the reaction tank 1, fully mixes the acid solution and salicylate solution, accelerates the precipitation rate of salicylic acid, ensures uniform crystal particles, and improves product quality.

[0033] The working principle of the entire equipment is as follows: First, the salicylate solution and acidic solution are injected into the reaction tank 1 in proportion through the feed port 3. Then, the second motor 51 is started, and the stirring assembly 5 starts to work. The driving wheel 52 drives the driven wheel 53, spline shaft 54, spline bushing 55 and stirring blade 56 to rotate horizontally. At the same time, the rotating plate 510 and the protrusion 511 make the stirring blade 56 move up and down, stirring the solution in multiple dimensions, promoting the rapid and complete acid precipitation reaction, so that the salicylate solution and acidic solution are fully mixed, and the salicylic acid precipitates out in the form of precipitate and settles to the bottom of the cone-shaped precipitation zone 11.

[0034] After the acid precipitation reaction is completed, the first motor 16 is started, and the rotating disk 13 drives the left and right accumulation tanks 14 to rotate and change positions. The precipitate in the left accumulation tank 14 rotates to the right and falls into the collection box 42 through the collection pipe 4. The liquid mixed in flows into the liquid collection box 41 through the second filter plate 43. The empty accumulation tank 14 rotates to the left to continue to receive new precipitate. This cycle realizes automatic continuous separation. When all the precipitate is discharged, the conduction valve 18 is opened, and the remaining supernatant in the reaction tank 1 is discharged through the drain pipe 17 and the first filter plate 15, completing the entire acid precipitation reaction and separation process.

[0035] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments for application in other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present utility model without departing from the technical solution of the present utility model shall still fall within the protection scope of the technical solution of the present utility model.

Claims

1. An acid precipitation reaction apparatus for salicylic acid production, comprising a reaction vessel (1), wherein a top cover (2) is fixedly connected to the top of the reaction vessel (1), and a through-feed inlet (3) is provided on the right side of the top of the top cover (2), characterized in that: A collection pipe (4) is fixedly connected to the bottom right side of the reaction vessel (1), and a stirring assembly (5) is fixedly connected to the middle of the top cover (2). The bottom of the reaction vessel (1) is provided with a conical sedimentation zone (11), and the bottom end of the conical sedimentation zone (11) is provided with a connecting groove (12). The inner surface of the connecting groove (12) is rotatably connected to a rotating disk (13). The left and right sides of the rotating disk (13) are provided with vertically penetrating accumulation grooves (14). The top of the left accumulation groove (14) is connected to the bottom of the conical sedimentation zone (11), and the bottom of the right accumulation groove (14) is connected to the top of the collection pipe (4).

2. The acid precipitation reaction apparatus for salicylic acid production according to claim 1, characterized in that: The reaction vessel (1) is fixedly connected to the middle of its bottom end by a first motor (16), the output shaft of which passes through the interior of the connecting groove (12) and is fixedly connected to the bottom center of the rotating disk (13).

3. The acid precipitation reaction apparatus for salicylic acid production according to claim 1, characterized in that: A drain pipe (17) is fixedly connected to the bottom left side of the reaction vessel (1), and a control valve (18) is fixedly connected to the middle of the drain pipe (17).

4. The acid precipitation reaction apparatus for salicylic acid production according to claim 3, characterized in that: The top end of the drain pipe (17) extends through to the bottom end of the left accumulation tank (14) and is fixedly connected to a filter plate (15).

5. The acid precipitation reaction apparatus for salicylic acid production according to claim 1, characterized in that: A liquid collection box (41) is slidably inserted into the bottom right side of the outer surface of the collection tube (4), and a collection box (42) is slidably inserted into the top right side of the outer surface of the collection tube (4). A filter plate (43) is fixedly connected to the bottom of the collection box (42).

6. The acid precipitation reaction apparatus for salicylic acid production according to claim 1, characterized in that: The stirring assembly (5) includes a second motor (51), which is fixedly connected to the top center of the top cover (2). The top cover (2) has a movable groove in the middle. The output shaft of the second motor (51) passes through the interior of the movable groove and is fixedly connected to a drive wheel (52).

7. The acid precipitation reaction apparatus for salicylic acid production according to claim 6, characterized in that: The outer surface of the driving wheel (52) is connected to four driven wheels (53) in a ring array, and the bottom of the driven wheel (53) is fixedly connected to a spline shaft (54).

8. The acid precipitation reaction apparatus for salicylic acid production according to claim 7, characterized in that: The bottom end of the spline shaft (54) extends through to the bottom of the top cover (2) and a spline shaft sleeve (55) is slidably connected to its outer surface. A stirring blade (56) is fixedly connected to the bottom end of the outer surface of the spline shaft sleeve (55).

9. The acid precipitation reaction apparatus for salicylic acid production according to claim 8, characterized in that: A cross bracket (57) is rotatably snapped onto the top of the outer surface of the four spline bushings (55). A top spring (59) is fixedly connected to the top of the cross bracket (57), and the top of the top spring (59) is fixedly connected to the lower surface of the top cover (2).

10. The acid precipitation reaction apparatus for salicylic acid production according to claim 9, characterized in that: The bottom center of the drive wheel (52) is fixedly connected to a connecting column (58), the bottom end of the connecting column (58) extends through to the lower surface of the cross bracket (57) and is fixedly connected to a rotating plate (510), and both ends of the top of the rotating plate (510) are fixedly connected to protrusions (511).

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