Distillation and purification device for triethyl orthoformate

Abstract

The utility model discloses a distillation and purification device for triethyl orthoformate. Comprising a bottom plate, a bearing block fixedly connected to the upper end of the bottom plate, a distillation still fixedly connected to the upper end of the bearing block, a groove body formed in the peripheral wall of the distillation still in a penetrating mode, a sliding door hinged to the inner wall of the groove body, a feeding assembly arranged on the peripheral wall of the distillation still, a steam output assembly arranged at the upper end of the distillation still and a discharging assembly arranged at the lower end of the distillation still. The first bearing ring is fixedly connected to the middle part of the inner wall of the distillation kettle; the movable ring is placed at the upper end of the first bearing ring; the fixed cylinder is arranged on the inner wall of the movable ring in a sliding manner; the separation cylinder is fixedly connected to the lower end of the movable ring; the guide cylinder is fixedly connected to the upper end of the fixed cylinder; the air guide assembly is arranged at the upper part of the inner wall of the distillation kettle. The utility model has the advantages that the internal airflow can be actively guided and adjusted, the mass and heat transfer efficiency is high, and the cleaning and maintenance are convenient.

Description

Technical Field

[0001] This utility model relates to the field of chemical separation equipment technology, specifically a distillation and purification device for triethyl orthoformate. Background Technology

[0002] Triethyl orthoformate, as an important chemical intermediate and reagent, often needs to be purified by distillation after its production to remove impurities. Currently, in industry, intermittent distillation is generally carried out using distillation kettles with heating jackets or coils. In this process, a heat medium is introduced into the heating element to heat and vaporize the material in the kettle. The vapor rises and enters the subsequent rectification system, while the heavy components remain at the bottom of the kettle.

[0003] However, existing distillation apparatuses of this type are typically simple in structure and single in function, with internal cavities or only simple fixed components. This makes it difficult to actively intervene in and optimize the material state during distillation, leading to uneven heating of the material and a tendency for localized overheating, which affects product yield and purity. Simultaneously, the static internal environment results in a single steam generation and upward path, limiting the efficiency of gas-liquid two-phase mass and heat transfer. Furthermore, heavy components or residues are prone to coking at the bottom and inner wall of the vessel, reducing thermal efficiency and making equipment cleaning difficult. In addition, existing apparatuses lack effective guidance and distribution mechanisms for the airflow inside the distillation vessel. Steam rises directly from the boiling liquid surface, potentially entraining droplets or causing components with different volatility to be carried out before sufficient separation, affecting the initial separation effect. The efficiency and stability of the entire distillation process largely depend on the uniformity of external heating, while the insufficient means of controlling the internal fluid dynamics state has become a technical bottleneck for improving the efficiency and quality of triethyl orthoformate distillation purification.

[0004] Therefore, there is an urgent need for a distillation and purification device that can optimize internal fluid distribution, enhance mass and heat transfer, and is easy to maintain. Utility Model Content

[0005] The purpose of this invention is to provide a distillation and purification device for triethyl orthoformate, which has the advantages of active guidance and adjustment of internal airflow, high mass and heat transfer efficiency, and easy cleaning and maintenance, thus solving the problems in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A distillation purification apparatus for triethyl orthoformate includes a base plate, a support block fixed to the upper end of the base plate, a distillation vessel fixed to the upper end of the support block, a tank extending through the outer peripheral wall of the distillation vessel, a sliding door hinged to the inner wall of the tank, a feeding assembly disposed on the outer peripheral wall of the distillation vessel, a steam output assembly disposed on the upper end of the distillation vessel, a discharge assembly disposed on the lower end of the distillation vessel, a heating assembly disposed on the bottom surface of the inner wall of the distillation vessel, a first support ring fixed to the middle of the inner wall of the distillation vessel, a movable ring placed on the upper end of the first support ring, a fixed cylinder slidably disposed on the inner wall of the movable ring, a separation cylinder fixed to the lower end of the movable ring, a second sieve hole extending through the upper part of the outer peripheral wall of the fixed cylinder, a guide cylinder fixed to the upper end of the fixed cylinder, and an air guide assembly disposed on the upper part of the inner wall of the distillation vessel.

[0008] Multiple first sieve holes are provided through the outer peripheral wall and bottom surface of the separation cylinder, and an air supply component for supplying air to the inside of the distillation kettle is provided at the upper end of the bottom plate.

[0009] The lower end of the separator is fixedly connected to an internally threaded cylinder, and a bolt is installed on the inner wall of the internally threaded cylinder. The upper end of the bolt is in contact with the lower end face of the fixed cylinder.

[0010] When the bolt moves upward on the inner wall of the internally threaded cylinder, the fixed cylinder will move upward, and at this time the lower inner wall of the air guide assembly and the outer peripheral wall of the guide cylinder will fit together.

[0011] An auxiliary air supply mechanism is also provided on the inner wall of the fixed cylinder.

[0012] Preferably, the feeding assembly includes a feed pipe that is fixed to the outer peripheral wall of the distillation vessel and a second valve body disposed on the feed pipe.

[0013] It is worth noting that this structure achieves controllable material addition by setting up an independent feeding component. The second valve body can precisely control the opening and closing of the feed pipe to ensure the system's airtightness during distillation and prevent external air or moisture from entering. This is crucial for the purification of easily hydrolyzed triethyl orthoformate, and it facilitates connection with the upstream feeding system, achieving operational convenience and process continuity.

[0014] Preferably, the steam output assembly includes a steam outlet that is fixedly attached to the upper end of the distillation vessel and a first valve body disposed on the steam outlet.

[0015] It is worth noting that the structure forms a controllable steam discharge channel through the steam outlet located at the top of the distillation vessel and the first valve body. The first valve body can be used to discharge non-condensable gases at the beginning of distillation, isolate the system when switching fractions, or precisely control the flow rate of steam entering the subsequent condensation and recovery system. This design ensures the safety and stability of the distillation process, prevents abnormal pressure, and allows for flexible control of the steam extraction stage, thereby optimizing the separation effect of different boiling point components.

[0016] Preferably, the heating assembly includes a coil fixed to the bottom of the inner wall of the distillation vessel, a hot oil injection pipe and a hot oil output pipe that are fixed to the outer peripheral wall of the distillation vessel, a third valve body disposed on the hot oil injection pipe and a fourth valve body disposed on the hot oil output pipe, wherein the liquid outlet ends of the hot oil injection pipe and the hot oil output pipe both pass through the outer peripheral wall of the distillation vessel and extend into the interior of the coil.

[0017] It is worth noting that this structure adopts a heating method that combines an internal coil with external hot oil circulation, which has significant advantages. The coil is immersed in the material, with a large heat transfer area and high efficiency, which can make the material heated evenly and effectively avoid the decomposition of heat-sensitive materials caused by local overheating. The third and fourth valve bodies facilitate the regulation of hot oil flow and start / stop, thereby achieving precise temperature rise program control and timely cooling. Compared with jacketed heating, this structure has lower requirements for the strength of the vessel body and is easier to maintain and leak-detect.

[0018] Preferably, the discharge assembly includes a discharge pipe that is fixedly connected to the lower end of the distillation vessel and a fifth valve body disposed on the discharge pipe.

[0019] It is worth noting that this structure achieves reliable and closed discharge of distillation residue or final product through the discharge pipe located at the bottom of the distillation vessel and the fifth valve body. The fifth valve body can prevent material leakage during the distillation process and ensure the system's sealing under negative or normal pressure. After distillation, the valves can be opened in sequence to discharge different components separately. The operation is safe and convenient, avoiding the safety hazards and material exposure risks caused by manual opening of the lid, and complies with chemical production standards.

[0020] Preferably, the air guiding assembly includes a second support ring fixed to the upper part of the inner wall of the distillation vessel, a vertical cylinder slidably disposed on the inner wall of the second support ring, a fixing ring fixed to the outer peripheral wall of the vertical cylinder, a plurality of first filter holes penetrating the lower end of the second support ring, a filter ring fixed to the inner wall of the vertical cylinder, and a plurality of second filter holes penetrating the lower end of the filter ring. The lower end of the fixing ring is in contact with the upper end of the second support ring, and the inner wall of the vertical cylinder and the outer peripheral wall of the fixing cylinder are on the same plane.

[0021] It is worth noting that the air guide assembly constitutes a key rectification and filtration channel for the rising steam. The sliding fit between the second bearing ring and the vertical cylinder makes the assembly easy to install and maintain. The first and second filter holes form a multi-level dispersion channel, which can evenly diffuse the airflow injected by the air supply assembly or the rising steam, preventing the formation of turbulence or gas short circuits. When the fixed cylinder rises, the outer wall of its guide cylinder fits against the inner wall of the vertical cylinder, forming a continuous and cross-sectionally controllable gas flow channel from the separation cylinder area to the steam outlet. This can effectively guide the steam to rise in a concentrated manner, reduce the diffusion of steam in the ineffective space inside the vessel, and force the steam to pass through the filter ring area, thereby enhancing the collision and capture effect on entrained droplets and improving the purity of the steam.

[0022] Preferably, the air supply assembly includes an air pump fixed to the upper end of the base plate and an air inlet pipe that is fixed to the outer peripheral wall of the distillation vessel. The air outlet of the air pump is connected to the air inlet of the air inlet pipe through a pipe, and the air outlet of the air inlet pipe extends to the inner wall of the filter ring.

[0023] It is worth noting that the air supply component provides the present invention with active airflow intervention capability. The airflow generated by the air pump is directly delivered to the central area of ​​the filter ring of the air guide component through the air inlet pipe. This airflow has multiple functions: First, it can blow inert gas (such as nitrogen) into the vessel before or during distillation to replace air, create an oxygen-free drying environment, and protect the material; Second, during the distillation process, the controllable airflow can disturb the liquid surface, promote boiling uniformity, and form an upward auxiliary airflow, which, together with the steam generated by heating, enhances the driving force for the transfer of substances from the liquid phase to the gas phase; Third, the airflow helps to sweep light components that may condense on the inner wall at higher positions back to the liquid phase or carry them into the steam flow, reducing residues inside the equipment.

[0024] Preferably, there is a gap between the outer peripheral wall of the separation cylinder and the inner wall of the first bearing ring.

[0025] It is worth noting that this gap design forms an important annular airflow channel. Its advantage is that the gas (or steam formed by heating) flowing out from the bottom and side of the first screen hole of the separator can flow upward through this annular gap. This avoids the accumulation of gas at the bottom of the separator and ensures the smooth flow path. This annular channel and the channel inside the separator through the second screen hole form a parallel airflow path. The airflow ratio can be adaptively distributed according to operating conditions (such as the height of the bolt adjustment, the air intake, etc.), so that the airflow state at different radial positions inside the vessel can be adjusted more flexibly, the gas-liquid contact efficiency can be optimized, and dead zones can be prevented.

[0026] Preferably, the auxiliary air supply mechanism includes a frame fixed to the inner wall of the fixed cylinder and fan blades rotatably mounted on the frame.

[0027] It is worth noting that this auxiliary air supply mechanism is a clever passive enhancement design. Its fan blades rotate automatically under the impact of the rising airflow. The rotating blades first further disperse the airflow passing through the fixed cylinder, making its distribution more uniform. Second, the rotation of the blades creates a pumping effect on the surrounding gas, slightly reducing the local pressure below the fixed cylinder, which helps to more effectively extract vaporization products from the separation cylinder, enhancing the steam collection and rising capabilities. Furthermore, the slight disturbance to the airflow caused by the rotating components can disrupt any laminar boundary layer that may form, enhancing mass transfer and reducing the adhesion of mist droplets to the inner wall of the fixed cylinder. This mechanism requires no additional power, operating using the fluid's own energy, thus improving energy utilization efficiency and the activation level of the internal flow field.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0029] 1. This utility model solves the problem of uncontrollable internal flow field in traditional devices by setting up an internally adjustable integrated component consisting of a movable ring, a fixed cylinder, a guide cylinder, a separation cylinder, and bolts, and combining it with an air guide component consisting of a bearing ring, a vertical cylinder, and a filter ring. Specifically, by screwing the bolts to make it rise inside the internal threaded cylinder, the fixed cylinder can be lifted and slide along the inner wall of the movable ring until the outer wall of the guide cylinder is tightly attached to the inner wall of the vertical cylinder. Thus, before distillation, a regular cross-section rising main channel is actively constructed from the heating area to the steam outlet according to the material characteristics. This structure makes the steam flow path change from disordered to controlled and concentrated, effectively reducing ineffective diffusion. By changing the screwing depth of the bolts, the ratio of the central flow channel inside the separation cylinder to the external annular gap flow channel can be flexibly adjusted, realizing the artificial intervention and optimization of the internal fluid dynamics state in the early stage of distillation, and significantly improving the separation efficiency.

[0030] 2. This utility model effectively solves the problems of uneven heating and local overheating of materials by the synergistic effect of the auxiliary air supply mechanism (frame and fan blades) and air supply components (air pump and air inlet pipe) located inside the fixed cylinder. The rising steam flow generated during the distillation process impacts and drives the fan blades to rotate. The rotating fan blades generate a stirring and pumping effect on the airflow, forcibly promoting the mixing and circulation of airflow in the area below the fixed cylinder, breaking the temperature stratification and making the heat distribution more uniform. In addition, when necessary, the air pump can be activated to inject inert gas from the center of the filter ring or adjust the airflow, further enhancing convection and ensuring that heat-sensitive materials are heated uniformly, reducing the risk of local overheating and decomposition from a physical structure perspective.

[0031] 3. This utility model effectively alleviates the problem of steam entrainment of liquid droplets through a separation and air guiding structure with multi-stage sieves and filter holes. After the steam is generated, it first passes through the first sieve holes on the bottom and side wall of the separation cylinder for initial distribution and interception. Then, the steam flows upward through the second sieve holes of the fixed cylinder and the guide cylinder, and finally must pass through the second filter hole of the filter ring and the first filter hole of the second bearing ring in the air guiding assembly. This multi-stage, tortuous channel design greatly increases the probability of collision between the steam and the solid surface, so that the entrained liquid droplets are effectively captured, condensed and fall back through inertia. Thus, the initial gas-liquid separation is completed before the steam leaves the distillation kettle, improving the purity of the output steam.

[0032] 4. This invention, through the design of suspending the separation cylinder above the heating zone with an annular gap between its peripheral wall and the inner wall of the first bearing ring, combined with active and passive airflow disturbance, helps to reduce coking of heavy components. This structure avoids material stagnation in absolute dead zones. The rising airflow and liquid circulation can create disturbance at the bottom and around the separation cylinder. At the same time, the airflow injected by the air supply component or the disturbance generated by the rotation of the fan blades can promote micro-circulation of the liquid at the bottom of the vessel, making it less likely for high-boiling-point substances to remain and solidify on the heating surface for a long time, thereby reducing coking and maintaining long-term thermal efficiency. Attached Figure Description

[0033] Figure 1 The diagram shown is a three-dimensional structural schematic of this utility model;

[0034] Figure 2 The diagram shown is a three-dimensional structural schematic of the heating component of this utility model;

[0035] Figure 3 The diagram shown is a three-dimensional structural schematic of the fixing cylinder of this utility model;

[0036] Figure 4 The diagram shown is a three-dimensional structural schematic of the discharge component of this utility model.

[0037] Figure 5 The diagram shown is a three-dimensional structural schematic of the air guide component of this utility model.

[0038] Figure 6 The diagram shown is a three-dimensional structural schematic of the vertical tube of this utility model.

[0039] Reference numerals: 1. Base plate; 2. Support block; 3. Distillation vessel; 301. Steam outlet; 302. First valve body; 4. Tank; 5. Sliding door; 6. Feed pipe; 7. Second valve body; 8. Air pump; 9. Air inlet pipe; 10. Hot oil injection pipe; 11. Third valve body; 12. Hot oil output pipe; 13. Fourth valve body; 14. Coil; 15. First support ring; 16. Movable ring; 17. Fixed cylinder; 18. Separation cylinder; 19. First sieve hole; 20. Second sieve hole; 21. Frame; 22. Fan blade; 23. Guide cylinder; 24. Discharge pipe; 25. Fifth valve body; 26. Second support ring; 27. First filter hole; 28. Vertical cylinder; 29. ​​Fixed ring; 30. Filter ring; 31. Second filter hole; 32. Internally threaded cylinder; 33. Bolt. Detailed Implementation

[0040] 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.

[0041] To address the problems in existing distillation kettles—such as simple internal structure and limited function leading to uneven heating and coking of materials, and a lack of effective control over the internal steam flow field, thus affecting separation efficiency and operational stability—the following technical solution is proposed. Please refer to [link / reference needed]. Figures 1-6 ;

[0042] A distillation purification apparatus for triethyl orthoformate includes a base plate 1, a support block 2 fixed to the upper end of the base plate 1, a distillation vessel 3 fixed to the upper end of the support block 2, a trough 4 penetrating the outer peripheral wall of the distillation vessel 3, a sliding door 5 hinged to the inner wall of the trough 4, a feeding assembly disposed on the outer peripheral wall of the distillation vessel 3, a steam output assembly disposed on the upper end of the distillation vessel 3, a discharge assembly disposed on the lower end of the distillation vessel 3, a heating assembly disposed on the bottom surface of the inner wall of the distillation vessel 3, a first support ring 15 fixed to the middle of the inner wall of the distillation vessel 3, a movable ring 16 placed on the upper end of the first support ring 15, a fixed cylinder 17 slidably disposed on the inner wall of the movable ring 16, a separation cylinder 18 fixed to the lower end of the movable ring 16, a second sieve hole 20 penetrating the upper part of the outer peripheral wall of the fixed cylinder 17, a guide cylinder 23 fixed to the upper end of the fixed cylinder 17, and an air guide assembly disposed on the upper part of the inner wall of the distillation vessel 3.

[0043] Multiple first sieve holes 19 are provided through the outer peripheral wall and bottom surface of the separation cylinder 18, and an air supply component for supplying air to the inside of the distillation kettle 3 is provided at the upper end of the bottom plate 1.

[0044] The lower end of the separating cylinder 18 is fixedly connected to an internally threaded cylinder 32, and a bolt 33 is threaded on the inner wall of the internally threaded cylinder 32. The upper end of the bolt 33 is in contact with the lower end face of the fixing cylinder 17.

[0045] When bolt 33 moves upward on the inner wall of internal threaded cylinder 32, fixed cylinder 17 will move upward, and at this time the lower inner wall of the air guide assembly and the outer peripheral wall of guide cylinder 23 will be in contact.

[0046] An auxiliary air supply mechanism is also provided on the inner wall of the fixed cylinder 17.

[0047] In this embodiment, specifically: the feeding assembly includes a feed pipe 6 that is fixed to the outer peripheral wall of the distillation vessel 3 and a second valve body 7 disposed on the feed pipe 6.

[0048] In this embodiment, specifically: the steam output component includes a steam outlet 301 that is fixedly connected to the upper end of the distillation vessel 3 and a first valve body 302 disposed on the steam outlet 301.

[0049] In this embodiment, the heating assembly specifically includes a coil 14 fixed to the bottom of the inner wall of the distillation vessel 3, a hot oil injection pipe 10 and a hot oil output pipe 12 fixed to the outer peripheral wall of the distillation vessel 3, a third valve body 11 disposed on the hot oil injection pipe 10, and a fourth valve body 13 disposed on the hot oil output pipe 12. The liquid outlet ends of the hot oil injection pipe 10 and the hot oil output pipe 12 both pass through the outer peripheral wall of the distillation vessel 3 and extend into the interior of the coil 14.

[0050] In this embodiment, specifically: the discharge assembly includes a discharge pipe 24 that is fixedly connected to the lower end of the distillation vessel 3 and a fifth valve body 25 disposed on the discharge pipe 24.

[0051] In this embodiment, specifically: the air guiding assembly includes a second support ring 26 fixed to the upper part of the inner wall of the distillation vessel 3, a vertical cylinder 28 slidably disposed on the inner wall of the second support ring 26, a fixing ring 29 fixed to the outer peripheral wall of the vertical cylinder 28, a plurality of first filter holes 27 penetrating the lower end of the second support ring 26, a filter ring 30 fixed to the inner wall of the vertical cylinder 28, and a plurality of second filter holes 31 penetrating the lower end of the filter ring 30. The lower end of the fixing ring 29 is attached to the upper end of the second support ring 26, and the inner wall of the vertical cylinder 28 and the outer peripheral wall of the fixing cylinder 17 are on the same plane.

[0052] In this embodiment, specifically: the air supply assembly includes an air pump 8 fixed to the upper end of the base plate 1 and an air inlet pipe 9 that is fixed to the outer peripheral wall of the distillation vessel 3. The air outlet of the air pump 8 is connected to the air inlet of the air inlet pipe 9 through a pipe, and the air outlet of the air inlet pipe 9 extends to the inner wall of the filter ring 30.

[0053] In this embodiment, specifically, there is a gap between the outer peripheral wall of the separation cylinder 18 and the inner wall of the first bearing ring 15.

[0054] In this embodiment, specifically: the auxiliary air supply mechanism includes a frame 21 fixed to the inner wall of the fixed cylinder 17 and a fan blade 22 rotatably mounted on the frame 21.

[0055] Working principle: When the device is working, it first checks the status of each component to ensure that the first valve body 302, the second valve body 7, the third valve body 11, the fourth valve body 13 and the fifth valve body 25 are in the closed state. Then, the initial height of the fixed cylinder 17 is adjusted by rotating the bolt 33.

[0056] During the preparation stage, the air pump 8 is turned on, and the inert gas is sent into the interior of the distillation vessel 3 through the air inlet pipe 9. The airflow reaches the filter ring 30 and diffuses through the second filter hole 31, passes through the first filter hole 27 between the vertical cylinder 28 and the second support ring 26, and finally fills the entire vessel to replace the air.

[0057] After the replacement is completed, turn off the air pump 8, open the sliding door 5, and the internal components can be inspected or maintained through the tank 4;

[0058] When feeding, the second valve body 7 is opened, and the raw material is added into the distillation kettle 3 through the feed pipe 6 and accumulates above the coil 14. After feeding is completed, the second valve body 7 and the sliding door 5 are closed. At this time, according to the material characteristics and process requirements, the bolt 33 can be tightened to make it move upward in the internal threaded cylinder 32, thereby lifting the fixed cylinder 17 and the guide cylinder 23 to slide upward until the outer peripheral wall of the guide cylinder 23 is tightly attached to the inner wall of the vertical cylinder 28, forming a continuous upward channel from the inside of the separation cylinder 18 to the steam outlet 301.

[0059] Distillation begins. The third valve body 11 and the fourth valve body 13 are opened. The heat medium enters the coil 14 from the hot oil injection pipe 10 to heat the material and then flows out from the hot oil output pipe 12. The material is heated and vaporized to produce steam. The steam and small droplets that may be carried first enter the interior of the separator 18 through the first sieve hole 19 on the bottom surface and the peripheral wall of the separator 18. Some of the steam can also flow upward through the annular gap between the separator 18 and the first bearing ring 15.

[0060] As the steam enters the separator 18, some of it passes through the second screen hole 20 on the periphery of the fixed cylinder 17 and enters the interlayer between the fixed cylinder 17 and the separator 18, and then continues to rise. The other part flows directly upward through the center of the fixed cylinder 17 and pushes the fan blade 22 to rotate as it flows through it. The rotating fan blade 22 further agitates and evenly distributes the airflow.

[0061] Steam flows into the guide cylinder 23 and rises along the regular channel formed by its contact with the vertical cylinder 28, passing through the filter ring 30 and the second support ring 26 in sequence. During this process, the liquid droplets and mist entrained in the steam are captured by the filter ring 30 and the first filter hole 27 and the second filter hole 31, achieving preliminary gas-liquid separation.

[0062] The purified steam is finally concentrated at the top of the distillation vessel 3. The first valve body 302 is opened, and the steam is discharged controllably through the steam outlet 301 and enters the subsequent condensation and recovery system.

[0063] During the distillation process, or to enhance mass transfer, the gas pump 8 can be restarted to inject a controllable gas flow into the system. This gas flow works synergistically with the steam generated by the heat source to optimize the flow field inside the vessel.

[0064] After distillation, the heat medium valve and the first valve body 302 are closed in sequence. After the system cools down, the fifth valve body 25 is opened, and the residue is discharged through the discharge pipe 24, completing one purification operation.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A distillation purification apparatus for triethyl orthoformate, characterized in that: It includes a base plate (1), a support block (2) fixed to the upper end of the base plate (1), a distillation vessel (3) fixed to the upper end of the support block (2), a trough (4) penetrating the outer peripheral wall of the distillation vessel (3), a sliding door (5) hinged to the inner wall of the trough (4), a feeding assembly set on the outer peripheral wall of the distillation vessel (3), a steam output assembly set on the upper end of the distillation vessel (3), a discharge assembly set on the lower end of the distillation vessel (3), and a heating assembly set on the bottom surface of the inner wall of the distillation vessel (3). A first support ring (15) fixed to the middle of the inner wall of the distillation vessel (3), a movable ring (16) placed at the upper end of the first support ring (15), a fixed cylinder (17) slidably disposed on the inner wall of the movable ring (16), a separation cylinder (18) fixed to the lower end of the movable ring (16), a second sieve hole (20) opened through the upper part of the outer peripheral wall of the fixed cylinder (17), a guide cylinder (23) fixed to the upper end of the fixed cylinder (17), and an air guide assembly disposed on the upper part of the inner wall of the distillation vessel (3); Multiple first sieve holes (19) are provided through the outer peripheral wall and bottom surface of the separation cylinder (18), and an air supply component for supplying air to the inside of the distillation kettle (3) is provided at the upper end of the bottom plate (1). The lower end of the separating cylinder (18) is fixedly connected to an internally threaded cylinder (32), and a bolt (33) is installed on the inner wall of the internally threaded cylinder (32). The upper end of the bolt (33) is in contact with the lower end face of the fixing cylinder (17). When the bolt (33) moves upward on the inner wall of the internal threaded cylinder (32), the fixed cylinder (17) will move upward, and at this time the lower inner wall of the air guide assembly and the outer peripheral wall of the guide cylinder (23) will be in contact. An auxiliary air supply mechanism is also provided on the inner wall of the fixed cylinder (17).

2. The distillation purification apparatus for triethyl orthoformate according to claim 1, characterized in that: The feeding assembly includes a feed pipe (6) that is fixed to the outer peripheral wall of the distillation vessel (3) and a second valve body (7) disposed on the feed pipe (6).

3. The distillation purification apparatus for triethyl orthoformate according to claim 1, characterized in that: The steam output assembly includes a steam outlet (301) that is fixed to the upper end of the distillation vessel (3) and a first valve body (302) disposed on the steam outlet (301).

4. The distillation purification apparatus for triethyl orthoformate according to claim 1, characterized in that: The heating assembly includes a coil (14) fixed to the bottom of the inner wall of the distillation vessel (3), a hot oil injection pipe (10) and a hot oil output pipe (12) fixed to the outer peripheral wall of the distillation vessel (3), a third valve body (11) provided on the hot oil injection pipe (10) and a fourth valve body (13) provided on the hot oil output pipe (12). The liquid outlet ends of the hot oil injection pipe (10) and the hot oil output pipe (12) both pass through the outer peripheral wall of the distillation vessel (3) and extend into the interior of the coil (14).

5. The distillation purification apparatus for triethyl orthoformate according to claim 1, characterized in that: The discharge assembly includes a discharge pipe (24) that is fixed to the lower end of the distillation vessel (3) and a fifth valve body (25) disposed on the discharge pipe (24).

6. The distillation purification apparatus for triethyl orthoformate according to claim 1, characterized in that: The air guiding assembly includes a second support ring (26) fixed to the upper part of the inner wall of the distillation vessel (3), a vertical cylinder (28) slidably disposed on the inner wall of the second support ring (26), a fixing ring (29) fixed to the outer peripheral wall of the vertical cylinder (28), a plurality of first filter holes (27) penetrating the lower end of the second support ring (26), a filter ring (30) fixed to the inner wall of the vertical cylinder (28), and a plurality of second filter holes (31) penetrating the lower end of the filter ring (30). The lower end of the fixing ring (29) is in contact with the upper end of the second support ring (26), and the inner wall of the vertical cylinder (28) and the outer peripheral wall of the fixing cylinder (17) are on the same plane.

7. The distillation purification apparatus for triethyl orthoformate according to claim 6, characterized in that: The air supply assembly includes an air pump (8) fixed to the upper end of the base plate (1) and an air inlet pipe (9) fixed to the outer peripheral wall of the distillation vessel (3). The outlet end of the air pump (8) is connected to the inlet end of the air inlet pipe (9) through a pipe, and the outlet end of the air inlet pipe (9) extends to the inner wall of the filter ring (30).

8. The distillation purification apparatus for triethyl orthoformate according to claim 1, characterized in that: There is a gap between the outer peripheral wall of the separator (18) and the inner wall of the first bearing ring (15).

9. The distillation purification apparatus for triethyl orthoformate according to claim 1, characterized in that: The auxiliary air supply mechanism includes a frame (21) fixed to the inner wall of the fixed cylinder (17) and fan blades (22) rotatably mounted on the frame (21).

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