Alkali dissolving tank for sodium methoxide production

Abstract

The invention discloses an alkali dissolving tank for sodium methoxide production, and relates to the technical field of sodium methoxide production equipment.The alkali dissolving tank is technically characterized by comprising a base and a tank body fixedly installed on the base, and a cooling structure is arranged in the tank body and comprises a hollow shaft rod rotationally connected to the tank body; a plurality of hollow upper shaft rings communicating with an inner cavity of the hollow shaft rod are fixedly mounted at the middle upper end of the hollow shaft rod, a plurality of hollow inclined lower stirring rods communicating with inner cavities of the hollow upper shaft rings are fixedly mounted on the hollow upper shaft rings, and the upper hollow inclined lower stirring rods and the lower hollow inclined lower stirring rods communicate through communicating pipes. According to the device, circulating flow of cooling water in the stirring process is achieved so as to effectively reduce the temperature, methanol vaporization and byproduct generation are prevented, meanwhile, cooling water recycling is achieved, water resources are saved, the tank body can be preheated at the low temperature, the safety and efficiency of sodium methoxide production are remarkably improved, and multiple defects in the prior art are overcome.

Description

Technical Field

[0001] The present invention relates to the technical field of sodium methoxide production equipment, and specifically to a caustic dissolving tank for sodium methoxide production. Background Art

[0002] The caustic dissolving tank in sodium methoxide production is a device for dissolving solid sodium hydroxide (NaOH) in methanol to form an alkaline solution, and is one of the key reaction vessels for preparing sodium methoxide (CH3ONa).

[0003] However, the strong exothermic characteristic of NaOH dissolving in methanol (the heat of dissolution reaches 44.5 kJ / mol) poses a major challenge to process safety. When the dissolution temperature exceeds the boiling point of methanol (64.7 °C), it is easy to cause a violent methanol vaporization phenomenon. The sharp increase in methanol vapor pressure may lead to the risk of container overpressure. At the same time, the high-temperature environment will promote the generation of by-products such as methyl formate, affecting the production of sodium methoxide. Therefore, we propose a new type of caustic dissolving tank for sodium methoxide production. Summary of the Invention

[0004] Aiming at the deficiencies of the prior art, the present invention provides a caustic dissolving tank for sodium methoxide production, which can effectively solve the problems raised in the background art.

[0005] To achieve the above object, the present invention provides the following technical solution: A caustic dissolving tank for sodium methoxide production, including a base and a tank body fixedly installed on the base, and a cooling structure is arranged inside the tank body;

[0006] The cooling structure includes a hollow shaft rod rotatably connected to the tank body. A plurality of hollow upper shaft rings communicating with the inner cavity of the hollow shaft rod are fixedly installed at the middle upper end of the hollow shaft rod. A plurality of hollow inclined lower stirring rods communicating with the inner cavity of the hollow upper shaft ring are fixedly installed on the hollow upper shaft ring. The upper and lower hollow inclined lower stirring rods are connected by a connecting pipe;

[0007] A plurality of hollow lower shaft rings communicating with the inner cavity of the hollow shaft rod are fixedly installed at the middle lower end of the hollow shaft rod. A plurality of hollow inclined upper stirring rods communicating with the inner cavity of the hollow lower shaft ring are fixedly installed on the hollow lower shaft ring.

[0008] Preferably, the hollow inclined lower stirring rods and the hollow inclined upper stirring rods are symmetrically distributed on the hollow shaft rod, and the hollow inclined lower stirring rod and the hollow inclined upper stirring rod with the closest vertical distance are connected by a connecting pipe.

[0009] Preferably, a plurality of bottom stirring rods are fixedly installed on the hollow shaft rod, the bottom stirring rods are in contact with the bottom of the inner cavity of the tank, and a driven gear is also fixedly installed on the hollow shaft rod.

[0010] Preferably, a recovery assembly is provided at the bottom end of the hollow shaft rod. The recovery assembly includes a detachable rotary joint provided at the bottom end of the hollow shaft rod, and a heat preservation box is fixedly installed on the detachable rotary joint; a valve is fixedly installed on one side of the heat preservation box, and a drain pipe is fixedly installed at the output end of the valve; a water pump is fixedly installed on the other side of the heat preservation box, a return bend pipe is fixedly installed at the output end of the water pump, a spiral pipe is fixedly installed at the liquid outlet end of the return bend pipe, the spiral pipe is arranged outside the tank body, and a water outlet pipe is fixedly installed at the liquid outlet end of the spiral pipe.

[0011] Preferably, support rods are fixedly installed on the heat preservation box, the drain pipe and the return bend pipe, and the support rods are fixedly connected to the base.

[0012] Preferably, a sealing cover is threadedly connected to the top end of the tank body, the top end of the hollow shaft rod penetrates through the sealing cover, and a rotary joint is fixedly installed at the top end of the hollow shaft rod.

[0013] Preferably, a plurality of temperature monitoring sensors are fixedly installed on the inner wall of the tank body; a motor bracket is fixedly installed at the bottom of the tank body, a motor is fixedly installed on the motor bracket, a driving gear is fixedly installed at the output end of the motor, and the driving gear meshes with a driven gear.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] 1. By providing a cooling structure, including a hollow shaft rod, a hollow upper shaft ring, a hollow inclined lower stirring rod, a hollow lower shaft ring and a hollow inclined upper stirring rod, the circulating flow of cooling water during the stirring process is realized, the temperature inside the tank is effectively reduced, the methanol vaporization and by-product generation caused by the strong exothermic characteristic of NaOH dissolved in methanol are prevented, and the safety and quality of sodium methoxide production are improved.

[0016] 2. By providing a recovery assembly, including a heat preservation box, a water pump and a spiral, the recovery and reuse of cooling water are realized, which not only saves water resources, but also can preheat the tank body in a low-temperature environment, improves the reaction efficiency and safety, and effectively solves the problems of water resource waste and low reaction efficiency in the prior art in a low-temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic structural diagram of the whole of the present invention;

[0018] Figure 2 is the present invention Figure 1 of the sectional structural diagram;

[0019] Figure 3 is the present invention Figure 1 of another perspective structural diagram;

[0020] Figure 4 This is a partial structural schematic diagram of the cooling structure of the present invention.

[0021] In the figure:

[0022] 1. Base; 2. Tank body; 3. Cooling structure; 301. Hollow shaft rod; 302. Hollow upper shaft ring; 303. Hollow inclined lower stirring rod; 304. Connecting pipe; 305. Hollow lower shaft ring; 306. Hollow inclined upper stirring rod; 307. Recovery assembly; 3071. Heat preservation box; 3072. Valve; 3073. Drain pipe; 3074. Water pump; 3075. Return bend pipe; 3076. Spiral pipe; 3077. Water outlet pipe; 308. Driven gear; 309. Bottom stirring rod; 4. Sealing cover; 5. Temperature monitoring sensor; 6. Motor bracket; 7. Motor; 8. Driving gear. Specific implementation manners

[0023] In the present invention, unless otherwise stated, the orientations such as "upper" and "lower" are usually relative to the directions shown in the drawings, or relative to the vertical, perpendicular or gravitational directions; similarly, for the convenience of understanding and description, "left" and "right" are usually relative to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the contours of the respective components, but the above orientation terms are not used to limit the present invention.

[0024] The present invention provides a technical solution:

[0025] Please refer to Figures 1 to 4 , a caustic soda dissolving tank for sodium methoxide production, which is characterized in that it includes a base 1 and a tank body 2 fixedly installed on the base 1, and a cooling structure 3 is arranged inside the tank body 2.

[0026] The cooling structure 3 includes a hollow shaft rod 301 rotatably connected to the tank body 2. A plurality of hollow upper shaft rings 302 communicating with the inner cavity of the hollow shaft rod 301 are fixedly installed at the middle upper end of the hollow shaft rod 301. A plurality of hollow inclined lower stirring rods 303 communicating with the inner cavity of the hollow upper shaft ring 302 are fixedly installed on the hollow upper shaft ring 302. The upper and lower two hollow inclined lower stirring rods 303 are connected through a connecting pipe 304; a plurality of hollow lower shaft rings 305 communicating with the inner cavity of the hollow shaft rod 301 are fixedly installed at the middle lower end of the hollow shaft rod 301. A plurality of hollow inclined upper stirring rods 306 communicating with the inner cavity of the hollow lower shaft ring 305 are fixedly installed on the hollow lower shaft ring 305.

[0027] During the caustic soda dissolution process, the motor drives the hollow shaft rod 301 to rotate, which in turn drives the hollow inclined lower stirring rods 303 and the hollow inclined upper stirring rods 306 on the hollow upper shaft ring 302 and the hollow lower shaft ring 305 to rotate and stir the materials. At the same time, when the temperature is too high, cooling water flows into the hollow shaft rod 301 from the outside, is split by the hollow upper shaft ring 302 and the hollow lower shaft ring 305 and circulates in each stirring rod to reduce the temperature inside the tank. The upper and lower stirring rods ensure smooth water flow through the connecting pipe 304. Its function is to promote the uniform mixing of materials through rotational stirring, and at the same time use the internal cooling water circulation to effectively control the reaction temperature, prevent methanol vaporization and the generation of by-products, and ensure the safety and quality of sodium methoxide production.

[0028] In some embodiments, the hollow inclined lower stirring rods 303 and the hollow inclined upper stirring rods 306 are symmetrically distributed on the hollow shaft rod 301, and the hollow inclined lower stirring rod 303 and the hollow inclined upper stirring rod 306 with the closest vertical distance are connected through the connecting pipe 304.

[0029] In this embodiment, during the caustic soda dissolution process, as the hollow shaft rod 301 rotates, the symmetrically distributed hollow inclined lower stirring rods 303 and the hollow inclined upper stirring rods 306 rotate synchronously to effectively stir the materials in the tank. At the same time, when the temperature is too high, the cooling water flows in through the hollow shaft rod 301, is split by the hollow upper shaft ring 302 and the hollow lower shaft ring 305 and reaches each stirring rod, and flows smoothly between the hollow inclined lower stirring rod 303 and the hollow inclined upper stirring rod 306 with the closest vertical distance through the connecting pipe 304 to form a cooling water circulation. Its function is to promote the uniform mixing of materials through stirring, use the cooling water circulation to effectively control the reaction temperature, prevent methanol vaporization and the generation of by-products, and ensure the safety and quality of sodium methoxide production.

[0030] Please refer to Figures 1 to 4 , several bottom stirring rods 309 are fixedly installed on the hollow shaft rod 301, the bottom stirring rods 309 are in contact with the inner cavity bottom of the tank body 2, and a driven gear 308 is also fixedly installed on the hollow shaft rod 301.

[0031] During caustic soda dissolution, the motor 7 drives the driven gear 308 to rotate through the driving gear 8, thereby driving the hollow shaft rod 301 to rotate, and the bottom stirring rods 309 on the hollow shaft rod 301 rotate accordingly to stir the materials at the bottom of the inner cavity of the tank body 2. The bottom stirring rods 309 ensure that the materials at the bottom of the tank can be fully mixed, avoid sedimentation, and promote the uniformity of the overall reaction. At the same time, as a transmission component, the driven gear 308 realizes the effective transmission of the motor power to the stirring system.

[0032] Please refer to Figures 1 to 2, a recovery component 307 is provided at the bottom end of the hollow shaft rod 301. The recovery component 307 includes a detachable rotary joint provided at the bottom end of the hollow shaft rod 301, and a heat preservation box 3071 is fixedly installed on the detachable rotary joint; a valve 3072 is fixedly installed on one side of the heat preservation box 3071, and a drain pipe 3073 is fixedly installed at the output end of the valve 3072; a water pump 3074 is fixedly installed on the other side of the heat preservation box 3071, a return bend pipe 3075 is fixedly installed at the output end of the water pump 3074, a spiral pipe 3076 is fixedly installed at the liquid outlet end of the return bend pipe 3075, the spiral pipe 3076 is arranged outside the tank body 2, and a water outlet pipe 3077 is fixedly installed at the liquid outlet end of the spiral pipe 3076.

[0033] After the water flows out through the hollow shaft rod 301, it enters the heat preservation box 3071 for storage. When the water volume in the heat preservation box 3071 reaches the upper limit, the valve 3072 is opened to drain water through the drain pipe 3073; in a low-temperature environment, the water pump 3074 pumps the hot water in the heat preservation box 3071, sends it into the spiral pipe 3076 through the return bend pipe 3075 to preheat the tank body 2, and then the hot water flows out through the water outlet pipe 3077; the recovery component 307 realizes the recovery and reuse of cooling water, which not only saves water resources, but also can preheat the tank body 2 when needed, improving the reaction efficiency and safety.

[0034] In some embodiments, support rods are fixedly installed on the heat preservation box 3071, the drain pipe 3073 and the return bend pipe 3075, and the support rods are fixedly connected to the base 1.

[0035] In this embodiment, the heat preservation box 3071, the drain pipe 3073 and the return bend pipe 3075 are stably connected to the base 1 through the support rods installed on them, ensuring the stability and safety of the entire recovery component 307 during the operation of the equipment.

[0036] Please refer to Figures 1 to 4 , a sealing cover 4 is threadedly connected to the top end of the tank body 2, the top end of the hollow shaft rod 301 penetrates through the sealing cover 4, and a detachable rotary joint is fixedly installed at the top end of the hollow shaft rod 301.

[0037] During the operation of the alkali dissolving tank, after adding methanol and solid sodium hydroxide into the tank body 2, the sealing cover 4 is tightly covered through threaded connection to ensure the sealing of the tank body. The top end of the hollow shaft rod 301 penetrates through the sealing cover 4 and a detachable rotary joint is installed, which is convenient for connecting with an external water supply system to introduce cooling water.

[0038] Please refer to Figures 1 to 4 , a plurality of temperature monitoring sensors 5 are fixedly installed on the inner wall of the tank body 2; a motor bracket 6 is fixedly installed at the bottom of the tank body 2, a motor 7 is fixedly installed on the motor bracket 6, a driving gear 8 is fixedly installed at the output end of the motor 7, and the driving gear 8 meshes with a driven gear 308.

[0039] The temperature monitoring sensor 5 on the inner wall of the tank body 2 monitors the temperature in real time. When the temperature exceeds the preset value, it triggers the start of the cooling system. At the same time, the motor 7 is fixed to the bottom of the tank body 2 through the motor bracket 6. The driving gear 8 at its output end meshes with the driven gear 308 on the hollow shaft rod 301, driving the hollow shaft rod 301 to rotate to stir the materials. The temperature monitoring sensor 5 ensures that the reaction temperature is within a safe range, and the motor 7 and the gear transmission system realize the stirring function, jointly ensuring the safety and efficiency of sodium methoxide production.

[0040] During specific use, first, methanol and solid sodium hydroxide need to be added to the tank body 2 in a certain proportion to ensure accurate feeding of the raw materials. Subsequently, tightly cover the sealing cover 4, and install a sealing gasket at the connection between the sealing cover 4 and the hollow shaft rod 301 to ensure the sealing of the tank body 2 and prevent gas or liquid leakage. Then, firmly install a detachable rotary joint at the top of the hollow shaft rod 301, and firmly fix the external water supply system to the detachable rotary joint at the top of the hollow shaft rod 301 to prepare for the subsequent cooling water circulation.

[0041] After starting the motor 7, the motor 7 drives the driving gear 8 to start rotating. Since the driving gear 8 meshes with the driven gear 308, the rotation of the driving gear 8 will directly drive the driven gear 308 to rotate. The driven gear 308 further drives the hollow shaft rod 301 to rotate, and the rotation of the hollow shaft rod 301 drives the hollow inclined lower stirring rod 303 and the hollow inclined upper stirring rod 306 to rotate synchronously. During the rotation of these stirring rods, the methanol and solid sodium hydroxide mixture in the tank body 2 is fully stirred, promoting more uniform mixing of the two, which is beneficial to the subsequent chemical reaction.

[0042] During the stirring process, the temperature in the tank body 2 will gradually increase. Due to the strong exothermic property of NaOH dissolving in methanol, when the temperature monitoring sensor 5 detects that the temperature in the tank body 2 is higher than the preset value (such as the boiling point of methanol 64.7 °C), the external water supply system will be immediately started. The cooling water flows into the hollow shaft rod 301 through the external water supply system, and is distributed evenly in the hollow inclined lower stirring rod 303 and the hollow inclined upper stirring rod 306 through the hollow upper shaft ring 302 and the hollow lower shaft ring 305. These stirring rods not only play a stirring role but also serve as the circulation channels for the cooling water. Through the circulating flow of the cooling water, the temperature in the tank body 2 is effectively reduced, ensuring that the temperature in the tank body 2 is always at an appropriate reaction temperature, avoiding the occurrence of methanol vaporization, reducing the generation of by-products at the same time, and improving the production quality of sodium methoxide.

[0043] During the flow of water inside the hollow downward-inclined stirring rod 303, it will be diverted through the connecting pipe 304 to facilitate the smooth discharge of the cooling water. Eventually, the cooling water is discharged from the bottom end of the hollow shaft rod 301 and all flows into the heat preservation box 3071 for storage. The design of the heat preservation box 3071 not only ensures the effective recovery of the cooling water but also facilitates the subsequent reuse of water resources. When the water volume stored in the heat preservation box 3071 reaches the upper limit, the valve 3072 can be opened to discharge the excess water through the drain pipe 3073 to ensure the normal operation of the heat preservation box 3071.

[0044] In addition, when the device is used in an environment with a relatively low temperature and it is necessary to preheat methanol to improve the reaction effect, the water in the heat preservation box 3071 can be pumped out by the water pump 3074 and transported to the return elbow 3075. When the water passes through the spiral pipe 3076, it will preheat the tank body 2, thereby increasing the temperature of methanol inside the tank body 2 and creating more favorable conditions for the chemical reaction. At the same time, the heated water in the heat preservation box 3071 can also be used for other purposes according to actual needs, such as cleaning equipment, heating other materials, etc., achieving the maximum utilization of water resources.

[0045] In summary, the alkali dissolving tank device for sodium methoxide production not only effectively solves the safety problems brought by the strong exothermic characteristic of NaOH dissolving in methanol during the sodium methoxide production process through the ingenious design of the cooling structure and the recovery component, but also realizes the recycling of water resources, improving the production efficiency and economic benefits.

[0046] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A caustic dissolving tank for sodium methoxide production, characterized in that, It includes a base and a tank body fixedly installed on the base, and a cooling structure is arranged inside the tank body; The cooling structure includes a hollow shaft rod rotatably connected to the tank body. At the middle and upper end of the hollow shaft rod, several hollow upper shaft rings communicating with the inner cavity of the hollow shaft rod are fixedly installed. On the hollow upper shaft rings, several hollow obliquely downward stirring rods communicating with the inner cavity of the hollow upper shaft rings are fixedly installed. The upper and lower two hollow obliquely downward stirring rods are connected by a connecting pipe; At the middle and lower end of the hollow shaft rod, several hollow lower shaft rings communicating with the inner cavity of the hollow shaft rod are fixedly installed. On the hollow lower shaft rings, several hollow obliquely upward stirring rods communicating with the inner cavity of the hollow lower shaft rings are fixedly installed.

2. A caustic dissolving tank for sodium methoxide production according to claim 1, characterized in that: The hollow obliquely downward stirring rods and the hollow obliquely upward stirring rods are symmetrically distributed on the hollow shaft rod. Among them, the hollow obliquely downward stirring rod and the hollow obliquely upward stirring rod with the closest vertical distance are connected by a connecting pipe.

3. A caustic dissolving tank for sodium methoxide production according to claim 1, characterized in that: Several bottom stirring rods are fixedly installed on the hollow shaft rod, and the bottom stirring rods are in contact with the bottom of the inner cavity of the tank. A driven gear is also fixedly installed on the hollow shaft rod.

4. A caustic dissolving tank for sodium methoxide production according to claim 1, characterized in that: A recovery component is arranged at the bottom end of the hollow shaft rod. The recovery component includes a detachable rotary joint arranged at the bottom end of the hollow shaft rod, and a heat preservation box is fixedly installed on the detachable rotary joint; A valve is fixedly installed on one side of the heat preservation box, and a drain pipe is fixedly installed at the output end of the valve; A water pump is fixedly installed on the other side of the heat preservation box. The output end of the water pump is fixedly installed with a return elbow pipe. The liquid outlet end of the return elbow pipe is fixedly installed with a spiral pipe. The spiral pipe is arranged outside the tank body, and the liquid outlet end of the spiral pipe is fixedly installed with a water outlet pipe.

5. A caustic dissolving tank for sodium methoxide production according to claim 4, characterized in that: Support rods are fixedly installed on the heat preservation box, the drain pipe and the return elbow pipe, and the support rods are fixedly connected with the base.

6. A caustic dissolving tank for sodium methoxide production according to claim 1, characterized in that: A sealing cover is threadedly connected to the top end of the tank body. The top end of the hollow shaft rod penetrates through the sealing cover, and a rotary joint is fixedly installed at the top end of the hollow shaft rod.

7. A caustic dissolving tank for sodium methoxide production according to claim 3, characterized in that: Several temperature monitoring sensors are fixedly installed on the inner wall of the tank body; a motor bracket is fixedly installed at the bottom of the tank body, and a motor is fixedly installed on the motor bracket. The output end of the motor is fixedly installed with a driving gear, and the driving gear meshes with the driven gear.

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