A pH value regulating reaction kettle for salicylamide synthesis

Abstract

The application provides a pH value regulating reaction kettle for salicylamide synthesis, which comprises a body, an upper cover and a stirring structure. A plurality of pH sensor units are arranged in layers in the kettle body of the body, a heating structure is embedded in the bottom of the kettle body, and an inner sidewall temperature sensor is embedded in the kettle body. The upper cover is connected with an acid liquid channel and an alkali liquid channel, atomizing nozzles are arranged at channel openings of the acid liquid channel and the alkali liquid channel, and check valves are arranged to prevent backflow. The stirring structure is composed of a frame type paddle and a propelling type paddle, and a scraper is arranged to clean the kettle wall.

Description

Technical Field

[0001] This utility model relates to the field of chemical synthesis reaction equipment technology, and in particular to a pH-controlled reaction vessel for the synthesis of salicylamide. Background Technology

[0002] In the synthesis of salicylamide, precise pH control is crucial for reaction rate and product purity. Existing reactors often use a single pH sensor, which cannot comprehensively reflect the pH distribution of the reaction system, leading to untimely adjustments. Furthermore, the lack of effective heating and temperature monitoring methods makes it difficult to maintain the required reaction temperature conditions. Utility Model Content

[0003] In view of this, the main objective of this utility model is to solve one of the above-mentioned problems.

[0004] This utility model provides a pH-controlled reactor for the synthesis of salicylamide, comprising: a main body, a top cover, and a stirring structure; the main body includes a reactor body, a discharge port, a valve, several pH sensor units, and several support legs; the top of the reactor body is connected to the top cover by bolts, the discharge port is located at the bottom of the reactor body, the valve is located inside the discharge port, several pH sensor units are embedded in the inner wall of the reactor body, and several support legs are arranged around the bottom of the reactor body; the top cover includes a cover body, a feed port, a threaded cap, and an acid channel. The system includes an alkali channel and two check valves. The feed inlet, acid channel, and alkali channel are all located on the cover. A threaded cap covers the feed inlet via threads. Check valves are installed in the openings of both the acid and alkali channels. The stirring structure includes a motor and a stirring rod. The motor is located at the top of the cover, and its drive shaft passes through the cover and connects to the stirring rod. The stirring rod includes an upper stirring rod and a lower stirring rod. The upper stirring rod is a frame-type blade, and the lower stirring rod is a propeller-type blade.

[0005] Furthermore, the main body includes a heating structure and several temperature sensors; several heating structures are embedded in the bottom of the vessel body, and several temperature sensors are embedded in the inner wall of the vessel body.

[0006] Furthermore, at least three pH sensor units are provided, and the three pH sensor units are arranged in layers along the depth direction of the vessel body.

[0007] Furthermore, the detection end of the pH sensor unit located at the bottom of the vessel is provided with an anti-crystallization protective cover.

[0008] Furthermore, the stirring structure includes a scraper connected to the stirring rod, and the scraper contacts the inner wall and the inner bottom of the vessel.

[0009] Furthermore, the upper cover includes two atomizing nozzles, and the atomizing nozzles are provided outside the openings of both the acid channel and the alkali channel.

[0010] The beneficial effects of this utility model are as follows:

[0011] Multiple pH sensor units are arranged in layers along the depth of the vessel to monitor the pH value of different liquid layers in real time, avoiding errors from a single detection point and improving control accuracy; the acid and alkali channels are equipped with check valves and atomizing nozzles to facilitate rapid addition and uniform spraying of acid or alkali solutions, simplifying the operation process; the stirring structure adopts a combination of frame-type blades and propeller-type blades to ensure thorough mixing of materials and improve reaction rate and uniformity. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a pH-controlled reaction vessel for the synthesis of salicylamide according to this utility model;

[0013] Figure 2 This is a schematic diagram of the main body of this utility model;

[0014] Figure 3 This is a schematic diagram of the top cover of this utility model;

[0015] Figure 4 This is a schematic diagram of the stirring structure of this utility model;

[0016] The above figures include the following reference numerals:

[0017] 1. Body; 101. Kettle body; 102. Discharge port; 103. Valve; 104. pH sensor unit; 1041. Anti-crystallization protective cover; 105. Support leg; 106. Heating structure; 107. Temperature sensor; 2. Top cover; 201. Cover body; 202. Inlet; 203. Threaded cap; 204. Acid channel; 205. Alkali channel; 206. Check valve; 207. Atomizing nozzle; 3. Stirring structure; 301. Motor; 302. Stirring rod; 3021. Upper stirring rod; 3022. Lower stirring rod; 303. Scraper. Detailed Implementation

[0018] The present application will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described in the present application can be combined with each other.

[0019] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model; the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In addition, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances. The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] like Figure 1 As shown in the preferred embodiment of this utility model, a pH-controlled reaction vessel for the synthesis of salicylamide includes: a body 1, a top cover 2, and a stirring structure 3;

[0021] like Figure 2 As shown, the main body 1 includes a vessel body 101, a discharge port 102, a valve 103, several pH sensor units 104, and several support legs 105. The top of the vessel body 101 is connected to the upper cover 2 by bolts. The discharge port 102 is located at the bottom of the vessel body 101. The valve 103 is located inside the discharge port 102. Several pH sensor units 104 are embedded in the inner wall of the vessel body 101. Several support legs 105 are located around the bottom of the vessel body 101. The vessel body 101 is preferably made of a corrosion-resistant material to adapt to acidic and alkaline environments and ensure long-term stable operation. The pH sensor units 104 monitor the pH value inside the vessel in real time.

[0022] like Figure 3As shown, the upper cover 2 includes a cover body 201, an inlet 202, a threaded cap 203, an acid channel 204, an alkali channel 205, and two check valves 206. The inlet 202, acid channel 204, and alkali channel 205 are all located on the cover body 201. The threaded cap 203 is detachably connected to the cover body 201 via threads and covers the inlet 202. The check valves 206 are installed inside the acid channel 204 and alkali channel 205. The cover body 201 seals the top of the reactor and integrates feeding and control components. The inlet 202, in conjunction with the threaded cap 203, provides a leak-proof seal and is adaptable to different feeding methods. The acid channel 204 and alkali channel 205 respectively deliver acid and alkali to adjust the pH, and the check valves 206 prevent backflow of the reaction liquid from corroding the pipelines, thus improving safety.

[0023] like Figure 4 As shown, the stirring structure 3 includes a motor 301 and a stirring rod 302. The motor 301 is located on the top of the cover 201, and the drive shaft of the motor 301 passes through the cover 201 and is connected to the stirring rod 302. The stirring rod 302 includes an upper stirring rod 3021 and a lower stirring rod 3022. The upper stirring rod 3021 is a frame-type impeller, and the lower stirring rod 3022 is a propeller-type impeller. The motor 301 is preferably a variable frequency motor, which can adjust the speed to adapt to different reaction stages through variable frequency control. The stirring rod 302 is divided into an upper stirring rod 3021 and a lower stirring rod 3022. The frame-type impeller as the upper stirring rod 3021 can exert a wide range of shearing force to break up liquid layer stratification and improve macroscopic mixing efficiency. The propeller-type impeller as the lower stirring rod 3022 can generate axial flow, enhance the upward circulation of materials at the bottom, and eliminate dead zones.

[0024] As a preferred embodiment of this utility model, it may also have the following additional technical features:

[0025] like Figure 2 As shown, in a preferred embodiment, the body 1 includes a heating structure 106 and a plurality of temperature sensors 107; the plurality of heating structures 106 are embedded in the bottom of the vessel body 101, and the plurality of temperature sensors 107 are embedded in the inner wall of the vessel body 101. The heating structure 106 embedded in the bottom of the vessel body provides a controllable heat source, and works with the temperature sensors 107 to achieve precise temperature control and avoid local overheating. At the same time, the temperature sensors 107 can also work in conjunction with the pH sensor 104 to regulate and optimize reaction conditions, such as preventing pH-sensitive reactions from going out of control due to high temperatures.

[0026] like Figure 2As shown, in a preferred embodiment, at least three pH sensor units 104 are provided, and the three pH sensor units 104 are arranged in layers along the depth direction of the vessel body 101. The layered arrangement of at least three pH sensor units 104, distributed along the depth direction, allows for real-time monitoring of the pH value of different liquid layers within the vessel, eliminating errors from single detection points, such as localized acid-base accumulation.

[0027] like Figure 2 As shown, in a preferred embodiment, the detection end of the pH sensor unit 104 at the bottom of the vessel body 101 is provided with an anti-crystallization protective cover 1041. Anti-crystallization protective cover (1041): The pH sensor unit 104 at the bottom is equipped with an anti-crystallization protective cover 1041 to prevent crystals from covering the detection end, reduce the detection error caused by crystals covering the pH sensor unit 104, and extend the life of the pH sensor unit 104.

[0028] like Figure 4 As shown, in a preferred embodiment, the stirring structure 3 includes a scraper 303 connected to the stirring rod 302, and the scraper 303 contacts the inner wall and bottom of the vessel body 101. The scraper 303 rotates synchronously with the stirring rod to scrape off adhering materials, reduce reactant waste, and maintain the heat conduction performance of the heating structure (106) after cleaning the side wall of the vessel body 101.

[0029] like Figure 3 As shown, in a preferred embodiment, the upper cover 2 includes two atomizing nozzles 207, and the atomizing nozzles 207 are provided outside the openings of both the acid channel 204 and the alkali channel 205. The atomizing nozzles 207 atomize the acid and alkali solutions and spray them evenly, avoiding excessively high local concentrations, reducing the risk of crystallization, and improving the uniformity of the reaction.

[0030] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A pH-controlled reaction vessel for the synthesis of salicylamide, characterized in that, include: Body (1), top cover (2), stirring structure (3); The main body (1) includes a vessel body (101), a discharge port (102), a valve (103), several pH sensor units (104), and several support legs (105); the top of the vessel body (101) is connected to the upper cover (2) by bolts, the discharge port (102) is located at the bottom of the vessel body (101), the valve (103) is located inside the discharge port (102), several pH sensor units (104) are embedded in the inner side wall of the vessel body (101), and several support legs (105) are located around the bottom of the vessel body (101); The upper cover (2) includes a cover body (201), an inlet (202), a threaded cap (203), an acid channel (204), an alkali channel (205), and two check valves (206). The inlet (202), the acid channel (204), and the alkali channel (205) are all located on the cover body (201). The threaded cap (203) is detachably connected to the cover body (201) by threads. The threaded cap (203) covers the inlet (202). The check valves (206) are provided in the openings of the acid channel (204) and the alkali channel (205). The stirring structure (3) includes a motor (301) and a stirring rod (302); the motor (301) is located on the top of the cover (201), and the drive shaft of the motor (301) passes through the cover (201) and is connected to the stirring rod (302). The stirring rod (302) includes an upper stirring rod (3021) and a lower stirring rod (3022). The upper stirring rod (3021) is a frame-type blade, and the lower stirring rod (3022) is a propeller-type blade.

2. The pH-controlled reaction vessel for salicylamide synthesis according to claim 1, characterized in that, The main body (1) includes a heating structure (106) and a plurality of temperature sensors (107); the plurality of heating structures (106) are embedded in the bottom of the vessel body (101), and the plurality of temperature sensors (107) are embedded in the inner wall of the vessel body (101).

3. The pH-controlled reaction vessel for salicylamide synthesis according to claim 1, characterized in that, At least three pH sensor units (104) are provided, and the three pH sensor units (104) are arranged in layers along the depth direction of the vessel body (101).

4. The pH-controlled reaction vessel for salicylamide synthesis according to claim 1, characterized in that, The detection end of the pH sensor unit (104) located at the bottom of the vessel body (101) is provided with an anti-crystallization protective cover (1041).

5. The pH-controlled reaction vessel for the synthesis of salicylamide according to claim 1, characterized in that, The stirring structure (3) includes a scraper (303), which is connected to the stirring rod (302) and contacts the inner wall and bottom of the vessel body (101).

6. The pH-controlled reaction vessel for the synthesis of salicylamide according to claim 1, characterized in that, The upper cover (2) includes two atomizing nozzles (207), and the atomizing nozzles (207) are provided outside the openings of the acid channel (204) and the alkali channel (205).

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