Lactide preparation reaction tank

Abstract

The utility model relates to the technical field of chemical preparation, in particular to a lactide preparation reaction tank which comprises a reaction tank body, a discharging channel is arranged at the bottom of the reaction tank body, a stirring and cleaning assembly is arranged in the reaction tank body, a filtering assembly is arranged at the top of the reaction tank body, and a motor drives a main stirring blade on a main stirring shaft to rotate. Meanwhile, the main stirring shaft drives the auxiliary stirring blades on the auxiliary stirring shaft to rotate through the connecting plate, and the raw materials in the reaction tank are mixed and stirred through the main stirring blades and the auxiliary stirring blades, so that the raw materials are mixed more uniformly, the layering phenomenon is avoided, the raw materials in the reaction tank can be further fully reacted, and meanwhile, a large amount of time and resources are saved.

Description

Technical Field

[0001] This utility model relates to the field of chemical preparation technology, and in particular to a reaction vessel for preparing lactide. Background Technology

[0002] Lactide is an organic compound with the molecular formula C6H8O4. It is a colorless, transparent, flaky or needle-like crystal with a melting point of 93-95℃, a boiling point of 216℃, and a molecular weight of 144. It is readily soluble in chloroform and ethanol, but insoluble in water. It is easily hydrolyzed and polymerized, and should be stored at low temperatures. When azeotropically reacted with water, it hydrolyzes to α-hydroxypropionic acid (lactic acid). Two molecules of α-hydroxypropionic acid react with water upon heating to form lactide, which is an intermediate in the synthesis of polylactic acid. The preparation of lactide requires a reaction vessel.

[0003] The current reaction vessels, during use, have gradually revealed the following defects:

[0004] (1) Most existing reaction vessels add raw materials in batches. Since the raw materials are added in a certain order, there is a high probability of stratification. Uneven mixing makes the raw materials in the reaction vessel not react sufficiently, which may result in the failure to obtain the desired substance and wastes a lot of time and resources.

[0005] (2) The raw materials added to the reaction vessel may contain impurities. If impurities enter the reaction vessel, they may affect the chemical reaction in the reaction vessel, and thus affect the substances generated subsequently, leading to the failure of preparation. Utility Model Content

[0006] In order to overcome the defects of the prior art mentioned above, the inventors conducted in-depth research and, after a great deal of creative work, completed this utility model.

[0007] Specifically, the technical problem to be solved by this utility model is to provide a lactide preparation reaction vessel to solve the current technical problem that the addition of raw materials in a certain order may result in stratification, uneven mixing and insufficient reaction of raw materials in the reaction vessel, which may not yield the desired substance and waste a lot of time and resources.

[0008] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0009] A lactide preparation reaction vessel includes a reaction vessel body, a discharge channel at the bottom of the reaction vessel body, a stirring and cleaning assembly inside the reaction vessel body, and a filter assembly at the top of the reaction vessel body;

[0010] The stirring and cleaning assembly includes a motor, the output end of which is connected to a main stirring shaft. Main stirring blades are evenly distributed on the main stirring shaft. A connecting plate is provided on the main stirring shaft near the uppermost main stirring blade. A secondary stirring shaft is symmetrically provided at the bottom of the connecting plate. Secondary stirring blades are evenly distributed on the secondary stirring shaft, and the main stirring blades and secondary stirring blades are alternately arranged. A scraping mechanism is provided on the outer surface of the main stirring shaft.

[0011] As an improved technical solution, the reaction vessel is provided with a U-shaped plate at the top, and the motor is located at the top of the U-shaped plate.

[0012] As an improved technical solution, the scraping mechanism includes a collection chamber, two collection chambers are symmetrically arranged on the main stirring shaft, a push plate is provided inside the collection chamber, a telescopic block is provided on one side of the push plate, a scraping plate is provided at one end of the telescopic block, a first spring is provided inside the collection chamber, the first spring is located between the push plate and the main stirring shaft, and through holes are symmetrically provided on the collection chamber.

[0013] As an improved technical solution, the filter assembly includes a feed channel located at the top of the reaction vessel near the U-shaped plate. A filter screen is installed inside the feed channel, and two sets of sliding shafts are slidably connected to the filter screen. Two sets of fixing plates are symmetrically arranged on the inner wall of the feed channel. The sliding shafts are fixedly connected to the fixing plates, and a limiting plate is provided at the top of the sliding shafts. A pushing mechanism is provided below the filter screen, and a sealing end cap is provided at the top of the feed channel.

[0014] As an improved technical solution, a second spring is sleeved on the outer surface of the sliding shaft, and the second spring is disposed between the fixed plate and the filter screen.

[0015] As an improved technical solution, the jacking mechanism includes a rotating shaft, which is rotatably connected to the feeding channel. A cam is provided on the rotating shaft, and a first bevel gear is provided at one end of the cam. A second bevel gear is provided on the main stirring shaft inside the U-shaped plate, and the second bevel gear meshes with the first bevel gear.

[0016] After adopting the above technical solution, the beneficial effects of this utility model are:

[0017] 1. This utility model uses a motor to drive the main stirring blades on the main stirring shaft to rotate. At the same time, the main stirring shaft drives the auxiliary stirring blades on the auxiliary stirring shaft to rotate through a connecting plate. The main stirring blades and auxiliary stirring blades mix and stir the raw materials in the reaction tank, making the mixture more uniform and preventing stratification. This allows the raw materials in the reaction tank to react more fully, while saving a lot of time and resources.

[0018] 2. This utility model uses a scraper to scrape the inner wall of the reaction vessel, which facilitates subsequent cleaning of the reaction vessel and reduces resource waste.

[0019] 3. This utility model filters the raw materials through a filter screen, removing impurities from the raw materials and preventing impurities from entering the reaction vessel. This prevents the impurities from affecting the chemical reaction in the reaction vessel, thus not affecting the subsequently generated substances and avoiding preparation failure. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0021] Figure 1 This is a schematic diagram of the overall structure of a lactide preparation reaction vessel according to the present invention.

[0022] Figure 2 This is a schematic diagram of the stirring and cleaning assembly of a lactide preparation reaction vessel according to the present invention.

[0023] Figure 3 This is a cross-sectional view of a reaction vessel for preparing lactide according to the present invention.

[0024] Figure 4 This is a schematic diagram of the filter assembly structure of a lactide preparation reaction vessel according to the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Reaction tank; 2. Discharge channel; 3. Stirring and cleaning assembly; 31. Motor; 32. Main stirring shaft; 33. Main stirring blade; 34. Connecting plate; 35. Secondary stirring shaft; 36. Secondary stirring blade; 37. U-shaped plate; 381. Storage chamber; 382. Push plate; 383. Telescopic block; 384. Scraper; 385. First spring; 386. Through hole; 4. Filter assembly; 41. Feed channel; 42. Filter screen; 43. Sliding shaft; 44. Fixing plate; 45. Second spring; 46. Limiting plate; 471. Rotating shaft; 472. Cam; 473. First bevel gear; 474. Second bevel gear; 48. Sealing end cover. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0029] Meanwhile, the meaning of "and / or" or "and / or" appearing throughout the text is that it includes three options. Taking "A and / or B" as an example, it includes option A, option B, or an option that satisfies both A and B.

[0030] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. When the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed by this utility model.

[0031] like Figures 1 to 4 As shown in the figure, this embodiment provides a lactide preparation reaction vessel, including a reaction vessel body 1, a discharge channel 2 at the bottom of the reaction vessel body 1, a stirring and cleaning assembly 3 inside the reaction vessel body 1, and a filter assembly 4 at the top of the reaction vessel body 1.

[0032] The stirring and cleaning assembly 3 includes a motor 31, the output end of which is connected to a main stirring shaft 32. Main stirring blades 33 are evenly distributed on the main stirring shaft 32. A connecting plate 34 is provided on the main stirring shaft 32 near the uppermost main stirring blade 33. A secondary stirring shaft 35 is symmetrically provided at the bottom of the connecting plate 34. Secondary stirring blades 36 are evenly distributed on the secondary stirring shaft 35, and the main stirring blades 33 and secondary stirring blades 36 are alternately arranged. A scraping mechanism is provided on the outer surface of the main stirring shaft 32. The motor 31 drives the main stirring blades 33 on the main stirring shaft 32 to rotate. At the same time, the main stirring shaft 32 drives the secondary stirring blades 36 on the secondary stirring shaft 35 to rotate through the connecting plate 34. The main stirring blades 33 and secondary stirring blades 36 mix and stir the raw materials in the reaction tank 1, making the mixture more uniform.

[0033] The top of the reaction vessel 1 is provided with a U-shaped plate 37, and the motor 31 is located on the top of the U-shaped plate 37. The motor 31 is fixed by the U-shaped plate 37 to prevent the motor 31 from shaking when it is working.

[0034] The scraping mechanism includes a receiving chamber 381. Two receiving chambers 381 are symmetrically arranged on the main stirring shaft 32. A push plate 382 is provided inside the receiving chamber 381. A telescopic block 383 is provided on one side of the push plate 382. A scraping plate 384 is provided at one end of the telescopic block 383. A first spring 385 is provided inside the receiving chamber 381. The first spring 385 is located between the push plate 382 and the main stirring shaft 32. Through holes 386 are symmetrically provided on the receiving chamber 381. The scraping plate 384 is used to scrape the inner wall of the reaction vessel 1, which facilitates the subsequent cleaning of the reaction vessel.

[0035] like Figure 1 , Figure 3 and Figure 4 As shown, the filter assembly 4 includes a feed channel 41, which is located at the top of the reaction vessel 1 near the U-shaped plate 37. A filter screen 42 is installed inside the feed channel 41, and two sets of sliding shafts 43 are slidably connected to the filter screen 42. Two sets of fixing plates 44 are symmetrically arranged on the inner wall of the feed channel 41, and the sliding shafts 43 are fixedly connected to the fixing plates 44. A limiting plate 46 is provided at the top of the sliding shafts 43. A pushing mechanism is provided below the filter screen 42, and a sealing end cap 48 is provided at the top of the feed channel 41. The filter screen 42 filters the raw materials, removes impurities from the raw materials, and prevents impurities from entering the reaction vessel, thus not affecting the chemical reaction in the reaction vessel.

[0036] A second spring 45 is sleeved on the outer surface of the sliding shaft 43. The second spring 45 is located between the fixed plate 44 and the filter screen 42. The tension of the second spring 45 drives the filter screen 42 to vibrate, thereby preventing the filter screen 42 from becoming clogged.

[0037] The actuating mechanism includes a rotating shaft 471, which is rotatably connected to the feed channel 41. A cam 472 is provided on the rotating shaft 471, and a first bevel gear 473 is provided at one end of the cam 472. A second bevel gear 474 is provided on the main stirring shaft 32 inside the U-shaped plate 37. The second bevel gear 474 meshes with the first bevel gear 473. The second bevel gear 474 drives the first bevel gear 473 to rotate. The first bevel gear 473 drives the cam 472 to rotate through the rotating shaft 471. The cam 472 intermittently pushes the filter screen 42 upward, thus realizing the transmission of motion.

[0038] In operation, the operator first opens the sealing end cap 48 at the top of the feed channel 41, then adds the raw material into the feed channel 41. The raw material then passes through the filter screen 42, which filters out impurities, preventing them from entering the reaction vessel and thus affecting the chemical reaction. Simultaneously, the motor 31 is started. The motor 31 drives the second bevel gear 474 on the main stirring shaft 32 to rotate. The second bevel gear 474, through the first bevel gear 473, drives the cam 472 on the rotating shaft 471 to rotate. The cam 472 intermittently pushes the filter screen 42 upwards. The filter screen 42 moves upwards along the sliding shaft 43, stretching the second spring 45 and generating tension. The tension of the second spring 45 causes the filter screen 42 to move downwards. The combined action of the cam 472 and the second spring 45 causes the filter screen 42 to vibrate, thus preventing clogging. The filtered raw material enters the reaction vessel 1, and then the main stirring shaft 32 drives the main stirring blade 33 to rotate. At the same time, the main stirring shaft 32 drives the auxiliary stirring blade 36 on the auxiliary stirring shaft 35 to rotate through the connecting plate 34. The main stirring blade 33 and the auxiliary stirring blade 36 mix and stir the raw material in the reaction vessel 1, making the mixture more uniform and preventing stratification. This allows the raw material in the reaction vessel to react more fully, while saving a lot of time and resources. After the reaction is completed, when cleaning the reaction vessel 1, the tension of the first spring 385 pushes the push plate 382. The push plate 382 pushes the scraper 384 to stick to the inner wall of the reaction vessel 1 through the telescopic block 383. The main stirring blade 33 drives the scraper 384 to rotate along the inner wall of the reaction vessel 1. The scraper 384 scrapes the inner wall of the reaction vessel 1, which facilitates the subsequent cleaning of the reaction vessel and reduces the waste of resources.

[0039] It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. Furthermore, it should be understood that after reading the technical description of this utility model, those skilled in the art can make various alterations, modifications, and / or variations to this utility model, and all such equivalent forms also fall within the scope of protection defined by the appended claims.

Claims

1. A reaction vessel for preparing lactide, comprising a reaction vessel body (1), wherein the bottom of the reaction vessel body (1) is provided with a discharge channel (2), characterized in that: The reaction vessel (1) is equipped with a stirring and cleaning assembly (3) inside, and a filter assembly (4) is provided on the top of the reaction vessel (1); The stirring and cleaning assembly (3) includes a motor (31), the output end of which is connected to a main stirring shaft (32). Main stirring blades (33) are evenly distributed on the main stirring shaft (32). A connecting plate (34) is provided on the main stirring shaft (32) near the uppermost main stirring blade (33). A secondary stirring shaft (35) is symmetrically provided at the bottom of the connecting plate (34). Secondary stirring blades (36) are evenly distributed on the secondary stirring shaft (35), and the main stirring blades (33) and the secondary stirring blades (36) are alternately arranged. A scraping mechanism is provided on the outer surface of the main stirring shaft (32).

2. The lactide preparation reaction vessel according to claim 1, characterized in that: The reaction vessel (1) is provided with a U-shaped plate (37) on top, and the motor (31) is located on top of the U-shaped plate (37).

3. The lactide preparation reaction vessel according to claim 2, characterized in that: The scraping mechanism includes a receiving chamber (381), two receiving chambers (381) are symmetrically arranged on the main stirring shaft (32), a push plate (382) is provided inside the receiving chamber (381), a telescopic block (383) is provided on one side of the push plate (382), a scraping plate (384) is provided at one end of the telescopic block (383), a first spring (385) is provided inside the receiving chamber (381), the first spring (385) is located between the push plate (382) and the main stirring shaft (32), and through holes (386) are symmetrically provided on the receiving chamber (381).

4. The lactide preparation reaction vessel according to claim 1, characterized in that: The filter assembly (4) includes a feed channel (41) located at the top of the reaction vessel (1) near the U-shaped plate (37). A filter screen (42) is provided inside the feed channel (41). Two sets of sliding shafts (43) are slidably connected to the filter screen (42). Two sets of fixing plates (44) are symmetrically provided on the inner wall of the feed channel (41). The sliding shafts (43) are fixedly connected to the fixing plates (44). A limiting plate (46) is provided at the top of the sliding shafts (43). A pushing mechanism is provided below the filter screen (42). A sealing end cap (48) is provided at the top of the feed channel (41).

5. The lactide preparation reaction vessel according to claim 4, characterized in that: A second spring (45) is sleeved on the outer surface of the sliding shaft (43), and the second spring (45) is located between the fixed plate (44) and the filter screen (42).

6. The lactide preparation reaction vessel according to claim 5, characterized in that: The jacking mechanism includes a rotating shaft (471) that is rotatably connected to the feed channel (41). A cam (472) is provided on the rotating shaft (471). A first bevel gear (473) is provided at one end of the cam (472). A second bevel gear (474) is provided on the main stirring shaft (32) inside the U-shaped plate (37). The second bevel gear (474) meshes with the first bevel gear (473).

Images