Hydrolysis device applied to sodium methoxide wastewater

Abstract

The utility model discloses a hydrolysis device applied to sodium methoxide wastewater, which comprises a support, a reaction kettle arranged on the support, a feed port, a water inlet, an exhaust port and an oil discharge port sequentially arranged at the top of the reaction kettle, a discharge port arranged at the bottom of the reaction kettle, a guide rod vertically arranged in the reaction kettle, a sliding sleeve sleeved on the guide rod, and a lifting pipe arranged on the side surface of the sliding sleeve. The upper end of the lifting pipe is connected with one end of a telescopic hose, the other end of the telescopic hose is connected with an oil outlet formed in the top of the reaction kettle, a supporting plate is arranged on the side wall of the reaction kettle, a first motor is arranged on the supporting plate, and an output shaft of the first motor penetrates through the side wall of the reaction kettle and extends into the reaction kettle. One end of the pulling rope is connected with the winding drum, and the other end of the pulling rope is connected with the sliding sleeve. The device disclosed by the utility model is high in hydrolysis efficiency, and the hydrolyzed oil phase and water can be quickly separated, so that the efficient recycling of the sodium methoxide wastewater is realized.

Description

Technical Field

[0001] This utility model relates to the technical field of sodium methoxide wastewater recovery equipment, and in particular to a hydrolysis device for sodium methoxide wastewater. Background Technology

[0002] Sodium methoxide is mainly used in the pharmaceutical industry, as a condensing agent in organic synthesis, a chemical reagent, and a catalyst for edible oil processing. Sodium methoxide products exist in two forms: solid and liquid. The solid form is pure sodium methoxide, while the liquid form is a sodium methoxide methanol solution with a sodium methoxide content of 27.5% to 31%. The alkaline process for sodium methoxide uses sodium hydroxide and methanol as raw materials, reacting them in a synthesis tower to produce sodium methoxide and water. The water generated during the reaction is removed using the synthesis tower, yielding a 30% sodium methoxide methanol solution at the bottom. Methanol gas and water vapor from the top of the tower are distilled in a methanol recovery tower, yielding anhydrous methanol at the top and process wastewater at the bottom. The production of sodium methoxide methanol solution generates a large amount of sodium methoxide process wastewater annually (with methanol content ≤3.0%, total alkali ≤0.0055%, pH=13, COD<40000mg / L, Fe3+≤0.0002). Treating this wastewater to meet the acceptance standards of wastewater treatment plants annually is costly and still involves resource waste and environmental risks. The methanol and alkaline substances in sodium methoxide wastewater can serve as auxiliary resources for the hydrolysis of sodium borohydride. If these resources can be utilized, it will reduce the pressure on wastewater treatment, replace tap water, and lower raw material consumption, meeting the urgent needs of the chemical industry for "green transformation" and "circular economy." Furthermore, this technology can be extended to similar chemical enterprises, promoting overall technological upgrading and sustainable development within the industry.

[0003] Currently, traditional sodium methoxide wastewater hydrolysis devices tend to discharge the oil phase along with water after hydrolysis, resulting in the oil phase containing a lot of impurities, which makes it difficult to recycle and reduces product quality. This leads to high costs for sodium methoxide wastewater recovery. In addition, the inner wall of the existing sodium methoxide hydrolysis reactor is prone to material adhesion, making cleaning difficult, time-consuming and labor-intensive, and the mixing efficiency of the hydrolysis process is low. Utility Model Content

[0004] This invention provides a hydrolysis device for sodium methoxide wastewater, which solves the problems of traditional sodium methoxide wastewater hydrolysis equipment where the oil phase is discharged together with water after hydrolysis, resulting in a large number of impurities in the oil phase, making it difficult to recycle and reuse, increasing product recycling costs, low mixing efficiency of the hydrolysis reactor, and high cleaning difficulty.

[0005] This utility model provides a hydrolysis device for sodium methoxide wastewater, including a support frame, a reaction vessel mounted on the support frame, a feed port, a water inlet, an exhaust port, and an oil outlet sequentially arranged on the top of the reaction vessel, a discharge port at the bottom of the reaction vessel, a guide rod vertically arranged inside the reaction vessel, a sliding sleeve fitted on the guide rod, a lifting pipe arranged on the side of the sliding sleeve, the upper end of the lifting pipe connected to one end of a telescopic hose, the other end of the telescopic hose connected to the oil outlet at the top of the reaction vessel, a support plate arranged on the side wall of the reaction vessel, a first motor mounted on the support plate, the output shaft of the first motor extending through the side wall of the reaction vessel into the interior of the reaction vessel, a drum mounted on the output shaft of the first motor, a traction rope mounted on the drum, one end of the traction rope connected to the drum, and the other end connected to the sliding sleeve.

[0006] Furthermore, a stirring shaft is installed inside the reactor, and multiple mixing plates are arranged along the circumference at the lower end of the stirring shaft. One end of each mixing plate is fixedly connected to the stirring shaft, and the other end is connected to a scraper provided on the inner wall of the reactor. Multiple stirring blades are arranged on the stirring shaft above the mixing plates. The upper end of the stirring shaft is rotatably connected to a shaft seat provided on the top of the reactor. A drive mechanism for driving the stirring shaft to rotate is provided on the top of the reactor.

[0007] Furthermore, the drive mechanism includes a support, a second motor, and a coupling. The support is located on the top of the reactor, and the second motor is mounted on the support. The output shaft of the second motor is coaxially and fixedly connected to the upper end of the stirring shaft via the coupling.

[0008] Furthermore, a jacketed cavity is provided inside the side wall of the reactor, a circulating liquid outlet port connected to the jacketed cavity is provided on the upper side wall of the reactor, and a circulating liquid inlet port connected to the jacketed cavity is provided on the lower side wall of the reactor.

[0009] Furthermore, the feed port, water inlet, vent, oil outlet, and discharge port are all connected to flange pipe fittings.

[0010] Furthermore, an inspection port is provided on the side wall of the reactor, and the inspection port is equipped with an inspection window.

[0011] As can be seen from the above technical solutions, this utility model provides a hydrolysis device for sodium methoxide wastewater.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. The output shaft of the first motor drives the drum to rotate, winding the traction rope and adjusting the height of the sliding sleeve and the lifting pipe fixedly connected to it. The upper oil phase (white oil containing trace amounts of water) in the reactor is extracted and separated. The lower aqueous phase (composition: sodium borohydride 10%, sodium hydroxide 30%, methanol 2%, water 58%) in the sodium methoxide wastewater is discharged through the discharge port. This prevents the oil and water from being discharged together after the sodium methoxide wastewater is hydrolyzed. The oil phase and water obtained after hydrolysis can be discharged quickly and separately, realizing the efficient recycling of sodium methoxide wastewater.

[0014] 2. The stirring shaft is driven by the drive mechanism to rotate the mixing plate, stirring blades and scraper to stir the hydrolysis reactants in the reactor. The stirring and mixing efficiency is high, and the inner wall can be cleaned at the same time to prevent the material from sticking to the wall. The raw material utilization rate is high. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the drawings used in the implementation examples will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of the overall structure of a hydrolysis device for sodium methoxide wastewater proposed in this utility model;

[0017] Figure 2 This is a schematic diagram of the internal structure of a hydrolysis device for sodium methoxide wastewater proposed in this utility model;

[0018] Figure 3 Appendix to this utility model Figure 1 A partially enlarged structural diagram of position I;

[0019] Figure 4 This is a cross-sectional view of the internal structure of a hydrolysis device for sodium methoxide wastewater proposed in this utility model;

[0020] Figure 5 This is a schematic diagram of the installation structure of the guide rod, sliding sleeve, and lifting pipe of a hydrolysis device for sodium methoxide wastewater proposed in this utility model.

[0021] In the picture:

[0022] 1-Support; 11-Feeding port; 12-Water inlet; 13-Exhaust port; 14-Oil drain port; 15-Discharge port; 16-Inspection window;

[0023] 2-Reaction vessel; 20-Jacketed cavity; 21-Stirring shaft; 22-Mixing plate; 23-Scraper; 24-Stirring blade; 25-Shaft seat; 201-Circulating liquid outlet; 202-Circulating liquid inlet;

[0024] 3-Guide rod; 31-Sliding sleeve; 32-Lifting tube; 33-Telescopic hose;

[0025] 4-Drive mechanism; 41-Support; 42-Second motor; 43-Coupling;

[0026] 5-Support plate; 50-First motor; 51-Drum; 52-Traction rope. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solutions of this utility model, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] Example 1:

[0029] See Figure 1-5A hydrolysis device for sodium methoxide wastewater includes a support 1, on which a reactor 2 is fixedly mounted. The top of the reactor 2 is sequentially provided with a feed inlet 11, a water inlet 12, an exhaust outlet 13, and an oil outlet 14. The bottom of the reactor 2 is provided with a discharge outlet 15. A guide rod 3 is vertically mounted inside the reactor 2, with its upper end fixedly connected to the top end cap of the reactor 2, suspending it inside the reactor 2. The guide rod 3 is a rectangular cross-section steel pipe, and a sliding sleeve 31 is fitted onto the guide rod 3. The sliding sleeve 31 passes through a rectangular guide hole inside its sleeve. The guide rod 3 slides vertically along its upper edge. A lifting pipe 32 is fixedly installed on the side of the sliding sleeve 31. The upper end of the lifting pipe 32 is connected to one end of the telescopic hose 33, and the other end of the telescopic hose 33 is sealed to the oil drain port 14 at the top of the reactor 2. A horizontal support plate 5 is fixedly installed on the side wall of the reactor 2, and a first motor 50 is fixedly installed on the support plate. The output shaft of the first motor 50 extends through the mounting hole on the side wall of the reactor 2 and is horizontally suspended inside the reactor 2. A seal is provided at the outer end of the mounting hole to hold the first motor 50 in place. The output shaft of the first motor 50 is sealed to the mounting hole. A drum 51 is coaxially fixed on the output shaft of the first motor 50. A traction rope 52 is wound on the drum 51. One end of the traction rope 52 is fixedly connected to the drum 51, and the other end is a free end connected to the fixed sliding sleeve 31. The first motor 50 drives its output shaft to rotate the drum 51, winding up the traction rope 52. This causes the sliding sleeve 31 and the lifting pipe 32 fixedly connected to it to rise and fall to adjust the height, thereby extracting and transporting the upper oil phase (white oil containing trace amounts of water) in the reaction vessel 2 to the white oil distillation vessel. After removing moisture by heating to 130℃, the white oil is recycled. The lower aqueous phase (composition: sodium borohydride 10%, sodium hydroxide 30%, methanol 2%, water 58%) in the sodium methoxide wastewater is discharged through discharge port 15 and transported to the hydrolysis distillation kettle, where it is heated to 120℃ to remove methanol. The crude product containing water methanol is collected and then dehydrated in a distillation column to obtain 99.5% anhydrous methanol for reuse. This prevents the rapid separation of the oil phase and water during the hydrolysis process of the sodium methoxide wastewater, allowing for efficient recycling of the sodium methoxide wastewater.

[0030] In the above embodiments, see Figure 4Furthermore, a stirring shaft 21 is coaxially arranged inside the reactor 2. Multiple mixing plates 22 are arranged circumferentially at the lower end of the stirring shaft 21. The mixing plates 22 are arc-shaped curved plates and are distributed radially along the bottom of the reactor 2. One end of each mixing plate 22 is fixedly connected to the stirring shaft 21, and the other end extends to a position near the inner wall of the reactor 2 and is connected to a vertically arranged scraper 23 on the inner wall of the reactor 2. The lower end of the scraper 23 is fixedly connected to the corresponding mixing plate 22. The outer edge of the scraper 23 vertically abuts against the inner wall of the reactor 2. By using the outer edge of the scraper 23 to abut against the inner wall of the reactor 2, the oil adhering to the inner wall of the reactor 2 can be scraped off, thus cleaning the reactor 2. The stirring shaft 21 above the mixing plates 22... Multiple stirring blades 24 are provided on the stirring shaft 21. The upper end of the stirring shaft 21 extends through the through hole on the top end cap of the reactor 2 to the top of the reactor 2. A bearing seat 25 is fixedly provided on the top of the reactor 2. The stirring shaft 21 is fitted inside the bearing seat 25 and is rotatably connected to the bearing seat 25. The stirring shaft 21 is sealed with a sealing ring installed in the through hole on the top of the reactor 2 to prevent gas from escaping from the reactor 2. A drive mechanism 4 is provided on the top of the reactor 2 to drive the stirring shaft 21 to rotate. The drive mechanism 4 drives the stirring shaft 21 to drive the mixing plate 22, stirring blades 24 and scraper 23 to clean the reactor 2. The cleaning efficiency is high, and the reactants can be fully stirred and mixed to react. The reaction efficiency is high and the raw material utilization rate is high.

[0031] In the above embodiments, see Figure 4 Furthermore, the drive mechanism 4 includes a support 41, a second motor 42, and a coupling 43. The support 41 is fixedly installed on the top of the reactor 2, and the second motor 42 is vertically installed on the support 41. The output shaft of the second motor 42 faces downward and is coaxially fixedly connected to the upper end of the stirring shaft 21 through the coupling 43. The second motor 42 can drive the stirring shaft 21 to rotate, thereby mixing the materials inside the reactor 2.

[0032] In the above embodiments, see Figure 3 Furthermore, a jacketed cavity 20 is provided inside the side wall of the reactor 2, a circulating liquid outlet 201 connected to the jacketed cavity is provided on the upper side wall of the reactor 2, and a circulating liquid inlet 202 connected to the jacketed cavity is provided on the lower side wall of the reactor 2.

[0033] In the above embodiments, see Figure 1 Preferably, the feed port 11, water inlet 12, exhaust port 13, oil outlet 14, and discharge port 15 are all connected to flange pipe joints. When a reaction occurs in the reactor 2, the exhaust port 13 is connected to the condenser, and the feed port 11, water inlet 12, and oil outlet 14 are sealed with sealing plates. When in use, the flange interface of the discharge port 15 is closed by installing a shut-off valve.

[0034] In the above embodiments, see Figure 1Preferably, an inspection port is provided on the side wall of the reactor 2, and the inspection port is provided with an inspection window 16. The inspection window 16 facilitates observation of the oil-water separation status and allows for easy access to the reactor 2 for maintenance and repair of internal components.

[0035] As can be seen from the above technical solution, during use, firstly, the materials for the condensation reaction (composition: sodium borohydride 32.71 kg, sodium methoxide 140.13 kg, white oil 900 kg) are added to the reaction vessel 2 through the feed port 11. After the reaction vessel 2 is cooled to 80°C, 220 kg of water (sodium methoxide wastewater is used here) is added through the water inlet 12. Then, the feed port 11 and the water inlet 12 are sealed with a sealing plate. Then, the exhaust port 13 is connected to the condenser. Next, the controller controls the drive mechanism 4 to drive the stirring shaft 21 to drive the mixing plate 22, stirring blades 24, and scraper 23. The materials in reactor 2 are stirred and mixed to ensure rapid and complete reaction of the raw materials. During stirring, the inner wall of reactor 2 is simultaneously cleaned, allowing sodium methoxide and water to react quickly and completely to produce sodium hydroxide and methanol. This process results in high reaction efficiency and high raw material utilization. Because the hydrolysis process is exothermic, the generated methanol (boiling point 64.7℃) evaporates and is discharged from exhaust port 13 into the condenser. After condensation, the crude aqueous methanol is collected and then dehydrated in a distillation column to obtain 99.5% anhydrous methanol for reuse. The hydrolyzed solution is allowed to stand for 24 hours for phase separation; the upper layer is an oil phase (white oil, containing...). A trace amount of water is introduced. The circulating pump is connected to the flange joint of the oil outlet 14 through a pipeline. Then, the output shaft of the first motor 50 drives the drum 51 to rotate, releasing the traction rope 52. The sliding sleeve 31 and the lifting pipe 32 move downward along the guide rod 3 under their own weight. After observing through the inspection window 16 that the lower end of the lifting pipe 32 has entered the oil phase, it stops. Then, the circulating pump is started, and the upper oil phase in the reactor 2 is sequentially drawn out of the reactor 2 through the lifting pipe 32 and the telescopic hose 33 from the oil outlet 14. It is then transported through a pipeline to the white oil distillation kettle and heated to 130°C for removal. After removing the water, the white oil is recycled. After the upper oil phase in reactor 2 is extracted, the lower aqueous phase (composition: sodium borohydride 10%, sodium hydroxide 30%, methanol 2%, water 58%) is discharged through the valve on discharge port 15 and sent to the hydrolysate distillation reactor to be heated to 120°C to remove methanol. The crude product containing water and methanol is collected and then dehydrated in a distillation column to obtain 99.5% anhydrous methanol for reuse. The hydrolysate after alcohol removal is concentrated, extracted, crystallized, centrifuged, washed, and dried to obtain sodium borohydride product, so that sodium methoxide wastewater can be efficiently recycled.

[0036] Other embodiments of the present invention will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. The present invention is intended to cover any variations, uses, or adaptations of the invention that follow the general principles of the invention and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope of the invention is indicated by the claims.

[0037] It should be understood that this utility model is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model.

Claims

1. A hydrolysis device for sodium methoxide wastewater, comprising a support frame (1), characterized in that: The support (1) is equipped with a reactor (2). The top of the reactor (2) is provided with a feed port (11), a water inlet (12), an exhaust port (13), and an oil outlet (14). The bottom of the reactor (2) is provided with a discharge port (15). A guide rod (3) is vertically installed inside the reactor (2). A sliding sleeve (31) is fitted on the guide rod (3). A lifting pipe (32) is provided on the side of the sliding sleeve (31). The upper end of the lifting pipe (32) is connected to one end of a telescopic hose (33). The other end of the telescopic hose (33) is connected to the other end of the telescopic hose (33). The oil drain port (14) is connected to the top of the reactor (2). A support plate (5) is provided on the side wall of the reactor (2). A first motor (50) is provided on the support plate. The output shaft of the first motor (50) extends through the side wall of the reactor (2) into the reactor (2). A drum (51) is provided on the output shaft of the first motor (50). A traction rope (52) is provided on the drum (51). One end of the traction rope (52) is connected to the drum (51), and the other end is connected to the sliding sleeve (31).

2. The hydrolysis device for sodium methoxide wastewater according to claim 1, characterized in that, The reactor (2) is equipped with a stirring shaft (21). Multiple mixing plates (22) are arranged at the lower end of the stirring shaft (21) along the circumferential direction. One end of each mixing plate (22) is fixedly connected to the stirring shaft (21), and the other end is connected to a scraper (23) arranged on the inner wall of the reactor (2). Multiple stirring blades (24) are arranged on the stirring shaft (21) above the mixing plate (22). The upper end of the stirring shaft (21) is rotatably connected to a bearing seat (25) arranged on the top of the reactor (2). A driving mechanism (4) for driving the stirring shaft (21) to rotate is arranged on the top of the reactor (2).

3. The hydrolysis device for sodium methoxide wastewater according to claim 2, characterized in that, The drive mechanism (4) includes a support (41), a second motor (42), and a coupling (43). The support (41) is located on the top of the reactor (2). The second motor (42) is located on the support (41). The output shaft of the second motor (42) is coaxially and fixedly connected to the upper end of the stirring shaft (21) through the coupling (43).

4. The hydrolysis device for sodium methoxide wastewater according to claim 1, characterized in that, The side wall of the reactor (2) is provided with a jacket cavity (20), the upper side wall of the reactor (2) is provided with a circulating liquid outlet (201) connected to the jacket cavity, and the lower side wall of the reactor (2) is provided with a circulating liquid inlet (202) connected to the jacket cavity.

5. The hydrolysis device for sodium methoxide wastewater according to claim 1, characterized in that, The feed port (11), water inlet (12), exhaust port (13), oil outlet (14), and discharge port (15) are all connected to flange pipe joints.

6. The hydrolysis device for sodium methoxide wastewater according to claim 1, characterized in that, The side wall of the reactor (2) is provided with an inspection port, and the inspection port is provided with an inspection window (16).

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