Diethyl phosphite rectification apparatus

Abstract

The utility model discloses diethyl phosphite rectification device, including reboiler, the reboiler outside is equipped with the heat conducting oil storage tank for heating the liquid in reboiler, and the control unit for transmitting and uniformly controlling liquid temperature is equipped between reboiler and heat conducting oil storage tank, and the control unit includes: the shaft part is the inner and outer double -layer pipe body for connecting reboiler and heat conducting oil storage tank, and the inner spiral body that has driven heat conducting oil movement is in the inner layer pipe body inside, drive part is located reboiler outside, is used for driving shaft part acceleration or deceleration rotation. Compared with prior art, the utility model has the advantages that when drive part drives shaft part rotation, the inner spiral body fixed in the inner guide pipe inside will produce the pumping action, realizes the circulating flow of heat conducting oil, and the heat conducting oil storage tank itself also plays the stirring action in rotation, accelerates the homogenization of heat conducting oil own temperature, avoids the partial overheating or supercooling, and the forced circulation of inner spiral body further strengthens this point.

Description

Technical Field

[0001] This utility model relates to the field of distillation technology, to the distillation of diethyl phosphite, and particularly to a distillation apparatus for diethyl phosphite. Background Technology

[0002] In the operation of diethyl phosphite distillation units, the crude material needs to be preheated to its bubble point temperature in a preheater using residual heat from the reboiler or steam before entering the distillation column. Currently, the most common method in the reboiler or reboiler of diethyl phosphite distillation systems is to use saturated steam, where high-temperature steam generated by a boiler is introduced into the reboiler jacket or internal heat exchange tubes. The steam condenses and releases heat, heating the material in the reboiler to bring it to a boil. Another method is using high-temperature heat transfer oil, suitable for heat-sensitive materials such as diethyl phosphite in medium-to-high temperature vacuum distillation. Oil bath heating is gentle and reduces the risk of localized overheating and material decomposition.

[0003] However, the heat transfer oil method requires heating the heat transfer oil, then pumping it into the reboiler. The cooled oil flows back to the storage tank and re-enters the heating furnace, forming a closed loop. Currently, existing technologies involve heating the heat transfer oil and then using it to heat the diethyl phosphite inside the reboiler.

[0004] Diethyl phosphite is heat-sensitive; local overheating can instantly cause molecular chain breakage, resulting in the production of flammable ethylene gas, acidic phosphorous acid, and black tar-like polymers. The temperature of the reboiler heating cannot fluctuate too much, and the heat transfer oil for reboiler heating needs to be precisely controlled to achieve precise temperature control inside the reboiler while the heat transfer oil conducts heat. Utility Model Content

[0005] The present invention addresses the aforementioned problems by providing a diethyl phosphite distillation apparatus.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problem is as follows: a diethyl phosphite distillation apparatus, including a reboiler, a heat transfer oil storage tank for heating the liquid inside the reboiler is provided outside the reboiler, and a control unit for transferring the liquid and uniformly controlling the liquid temperature is provided between the reboiler and the heat transfer oil storage tank. The control unit includes:

[0007] The shaft consists of an inner and outer double-layered tube, used to connect the reboiler and the heat transfer oil storage tank. The inner tube has an inner spiral that drives the movement of the heat transfer oil.

[0008] The drive unit, located outside the reboiler, is used to drive the shaft to accelerate or decelerate its rotation.

[0009] A further preferred embodiment of this utility model is: the shaft portion includes a fixed tube body, an outer sleeve, a rotating sleeve, and an inner guide tube;

[0010] The fixed tube body has an outer layer on the outside, which is rotatably embedded inside the outer sleeve. The outer sleeve is fixed to the reboiler. Both ends of the fixed tube body extend into the reboiler and the heat transfer oil storage tank, respectively. The fixed tube body is fixed to the heat transfer oil storage tank. The rotating sleeve is located inside the reboiler and is fixed to the end of the fixed tube body. The inner guide tube is located inside the rotating sleeve and extends from the fixed tube body into the heat transfer oil storage tank. The diameter of the inner guide tube is smaller than the inner diameter of the fixed tube body and the rotating sleeve. A supporting rod is fixed between one end of the inner guide tube and the inner wall of the rotating sleeve.

[0011] A further preferred embodiment of this utility model is: the rotating sleeve is made of thin-walled metal material, and its outer side has a protruding layer integrally formed along its axis, the protruding layer being used to stir the liquid inside the reboiler.

[0012] A further preferred embodiment of this utility model is: the protruding layer has a heat-conducting hole that penetrates the protruding layer, the heat-conducting hole is a sheet metal tube integrally formed with the protruding layer, and the heat-conducting hole is used to increase the contact area with the liquid inside the reboiler.

[0013] A further preferred embodiment of this utility model is: the inner spiral body is fixed inside the inner conduit, and the inner spiral body is a thin metal sheet.

[0014] A further preferred embodiment of this utility model is: the inner spiral body has a through hole extending along its axial direction.

[0015] A further preferred embodiment of this utility model is: the drive unit includes a servo motor, a first gear, and a second gear;

[0016] The servo motor is installed on the outside of the reboiler. Gear 1 is fixed to the output end of the servo motor, and gear 2 is fixed to the fixed tube body. Gear 1 and gear 2 mesh.

[0017] A further preferred embodiment of this utility model is: the exterior of the heat transfer oil storage tank has a heating layer for heating the heat transfer oil storage tank.

[0018] A further preferred embodiment of this utility model is: a distillation column is connected to the outer side of the reboiler for fractionating the liquid inside the reboiler.

[0019] A further preferred embodiment of this utility model is: a heat exchanger is connected to the outside of the distillation column for condensing the light component vapor at the top of the distillation column into liquid.

[0020] Compared with the prior art, the advantages of this utility model are:

[0021] 1. When the drive shaft rotates, the inner spiral fixed inside the inner guide tube will generate a pumping action to realize the circulation of heat transfer oil.

[0022] 2. The rotating heat transfer oil storage tank itself also acts as a stirrer, which accelerates the uniformity of the heat transfer oil temperature and avoids local overheating or undercooling. The forced circulation of the inner spiral further enhances this effect.

[0023] 3. The protruding layer on the outside of the rotating sleeve is essentially an integrated stirring blade, which stirs the diethyl phosphite. The heat-conducting holes allow the material to pass through, further disrupting the stagnant boundary layer and forcing the diethyl phosphite to flow between the protruding layers and in the holes. The heat exchange process and the mixing process of diethyl phosphite are always synchronized, avoiding local overheating or underheating. Attached Figure Description

[0024] The present invention will be further described in detail below with reference to the accompanying drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are drawn only for the purpose of explaining the preferred embodiments and therefore should not be regarded as a limitation on the scope of the present invention. In addition, unless otherwise specified, the drawings are only schematic representations of the composition or structure of the described objects and may contain exaggerated displays, and the drawings are not necessarily drawn to scale.

[0025] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0026] Figure 2 This is a half-sectional structural diagram of the reboiler and heat transfer oil storage tank of this utility model.

[0027] Figure 3 This is a schematic diagram of the half-section structure of the shaft portion of this utility model;

[0028] Figure 4 This utility model Figure 3 A magnified schematic diagram of the structure of part A in the diagram;

[0029] Figure 5 This is a schematic diagram of the half-section structure of the rotating sleeve of this utility model;

[0030] Figure 6 This is a schematic diagram of the cross-sectional structure of the rotating sleeve of this utility model.

[0031] In the diagram: 1. Distillation column; 2. Heat exchanger; 3. Reboiler; 4. Thermal oil storage tank; 5. Control unit; 51. Shaft; 511. Fixed tube; 512. Outer layer; 513. Outer sleeve; 514. Rotating sleeve; 515. Inner guide tube; 516. Inner spiral; 517. Fixed rod; 518. Protruding layer; 519. Thermal hole; 52. Drive unit; 521. Servo motor; 522. Gear 1; 523. Gear 2. Detailed Implementation

[0032] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are merely descriptive and exemplary and should not be construed as limiting the scope of protection of the present invention.

[0033] It should be noted that similar labels in the following figures indicate similar items; therefore, once an item is defined in one figure, it may not be further defined and explained in subsequent figures.

[0034] This embodiment mainly describes the diethyl phosphite distillation apparatus, as follows: The diethyl phosphite distillation apparatus, such as... Figures 1-2 As shown, the system includes a reboiler 3, with a heat transfer oil storage tank 4 located outside the reboiler 3 for heating the liquid inside the reboiler 3. A control unit 5 is located between the reboiler 3 and the heat transfer oil storage tank 4 for transferring the liquid and uniformly controlling the liquid temperature. The control unit 5 includes:

[0035] The shaft 51 is a double-layered tube, used to connect the reboiler 3 and the heat transfer oil storage tank 4. The inner tube has an inner spiral 516 that drives the heat transfer oil.

[0036] The drive unit 52 is located outside the reboiler 3 and is used to drive the shaft unit 51 to accelerate or decelerate its rotation.

[0037] Specifically, the reboiler 3 is an indispensable device in the distillation unit. There is a control unit 5 between the reboiler 3 and the heat transfer oil storage tank 4. The heat transfer oil storage tank 4 is used to heat the heat transfer oil and exchange heat with the diethyl phosphite inside the reboiler 3, thereby heating the diethyl phosphite inside the reboiler 3. The control unit 5 includes a shaft 51 and a drive unit 52. The shaft 51 is a double-layered pipe with a sleeve. The inner pipe has an inner spiral 516 that drives the movement of the heat transfer oil. When the shaft 51 rotates, it can transfer the heat transfer oil in the heat transfer oil storage tank 4 through the shaft 51 and through the outer double-layered pipe to achieve a circulation.

[0038] like Figures 3-4 As shown, the shaft portion 51 includes a fixed tube body 511, an outer sleeve 513, a rotating sleeve 514, and an inner guide tube 515;

[0039] The fixed tube body 511 has an outer layer 512 on the outside, which is rotatably embedded inside the outer sleeve 513. The outer sleeve 513 is fixed to the reboiler 3. The two ends of the fixed tube body 511 extend into the reboiler 3 and the heat transfer oil storage tank 4, respectively. The fixed tube body 511 is fixed to the heat transfer oil storage tank 4. The rotating sleeve 514 is located inside the reboiler 3 and is fixed to the end of the fixed tube body 511. The inner conduit 515 is located inside the rotating sleeve 514 and extends from the fixed tube body 511 into the heat transfer oil storage tank 4. The diameter of the inner conduit 515 is smaller than the inner diameter of the fixed tube body 511 and the rotating sleeve 514. A supporting fixing rod 517 is fixed between one end of the inner conduit 515 and the inner wall of the rotating sleeve 514.

[0040] Specifically, the shaft 51 includes a fixed tube 511, which is rotatably mounted to the outer sleeve 513. The outer sleeve 513 is fixed to the reboiler 3, while the fixed tube 511 can rotate and is driven by the drive unit 52. Based on this, the shaft 51 drives the outer heat transfer oil tank 4 to rotate as a whole, and the heat transfer oil inside the heat transfer oil tank 4 is heated in a uniform state, resulting in more uniform heat exchange of the heat transfer oil at a uniform temperature.

[0041] It should be noted that there are gaps inside the inner conduit 515 and between the inner conduit 515 and the fixed tube 511, all of which are filled with heat transfer oil. When the fixed tube 511 rotates, it ensures that the heat transfer oil inside is circulated, so that heat exchange is continuous and the temperature of the heat transfer oil is relatively the same as the temperature of the diethyl phosphite inside the reboiler 3.

[0042] like Figures 5-6 As shown, the rotating sleeve 514 is made of thin-walled metal and has an integrally formed protruding layer 518 on its outer side along its axis. The protruding layer 518 is used to stir the liquid inside the reboiler 3.

[0043] Specifically, the rotating sleeve 514 is a heat exchange component, with heat transfer oil inside and diethyl phosphite outside. The rotating sleeve 514 is sandwiched between the heat transfer oil and diethyl phosphite. The protruding layer 518 is an integrally formed protruding part on the outer side of the rotating sleeve 514, making the rotating sleeve 514 concave and convex, increasing the contact area and also achieving a stirring effect on the diethyl phosphite.

[0044] like Figure 6 As shown, the protruding layer 518 has a heat-conducting hole 519 that penetrates the protruding layer 518. The heat-conducting hole 519 is a sheet metal tube integrally formed with the protruding layer 518. The heat-conducting hole 519 is used to increase the contact area with the liquid inside the reboiler 3.

[0045] Specifically, the heat-conducting holes 519 on the protruding layer 518 are integrally formed with the protruding layer 518 and connect both sides of the protruding layer 518. The heat-conducting holes 519 are not connected to the inside of the rotating sleeve 514. When the rotating sleeve 514 rotates, it controls the diethyl phosphite to pass through the heat-conducting holes 519, thereby increasing the flow of diethyl phosphite.

[0046] like Figure 5 As shown, the inner spiral 516 is fixed inside the inner conduit 515, and the inner spiral 516 is a thin metal sheet.

[0047] Specifically, the inner spiral 516 is confined within the inner conduit 515. During the rotation of the inner conduit 515, the rotation is accelerated or decelerated, so that the inner spiral 516 exerts a thrust on the heat transfer oil. Under this force, the heat transfer oil is automatically circulated.

[0048] like Figure 5 As shown, the inner helix 516 has a through hole extending along its axial direction.

[0049] Specifically, the inner conduit 515 is axially positioned to ensure the heat transfer oil is continuous, facilitating heat transfer.

[0050] like Figure 2 As shown, the drive unit 52 includes a servo motor 521, a first gear 522, and a second gear 523;

[0051] Servo motor 521 is installed on the outside of reboiler 3. Gear 1 522 is fixed to the output end of servo motor 521, and gear 2 523 is fixed to fixed tube body 511. Gear 1 522 and gear 2 523 mesh.

[0052] Specifically, the drive unit 52 mainly controls the rotation of the shaft 51 through the servo motor 521, and controls its acceleration or deceleration. How the servo motor 521 is operated is existing technology and will not be described in detail here.

[0053] like Figure 1 As shown, the exterior of the heat transfer oil storage tank 4 has a heating layer for heating the heat transfer oil storage tank 4. The heating layer is an electric heating layer, which is also a commonly used device for heating the heat transfer oil storage tank 4.

[0054] like Figure 1 As shown, a distillation column 1 is connected to the outer side of the reboiler 3 for fractionating the liquid inside the reboiler 3. The distillation column 1 is also an important part of the distillation apparatus, realizing the function of fractionation.

[0055] like Figure 1As shown, a heat exchanger 2 is connected to the outside of the distillation column 1 to condense the light component vapor at the top of the distillation column 1 into liquid. The heat exchanger 2 is an important part of the distillation unit, realizing the recovery function. Both the distillation column 1 and the heat exchanger 2 are existing technologies and will not be described in detail here.

[0056] Working principle: The function of reboiler 3 is to heat diethyl phosphite, and the resulting steam moves to distillation column 1. After passing through the layers of distillation column 1, heat exchanger 2 condenses the light component steam at the top of the column into liquid through efficient heat exchange of hot and cold fluids, so as to achieve recycling and reuse.

[0057] The proposed solution addresses the difficulty in precisely controlling the internal temperature of the reboiler 3 while the heat transfer oil is conducting heat. To resolve this, a servo motor 521 drives the fixed tube 511 to rotate, causing the heat transfer oil tank 4, rotating sleeve 514, and inner conduit 515 to rotate together. During acceleration or deceleration, the inner spiral 516 inside the inner conduit 515 rotates, allowing the heat transfer oil to move forward or backward along the inner conduit 515. Simultaneously, the fixing rod 517 keeps the two ends of the inner conduit 515 connected. In this configuration, a gap exists between the inner conduit 515, the fixed pipe body 511, and the rotating sleeve 514, allowing the heat transfer oil to circulate along the inner and outer sides of the inner conduit 515. Under the heating action of the heat transfer oil storage tank 4, heat is transferred through the rotating sleeve 514. It should be noted that during the rotation of the rotating sleeve 514, the internal heat transfer oil is replaced, and its outer protruding layer 518 and heat-conducting holes 519 agitate the diethyl phosphite in the reboiler 3, simultaneously controlling the uniform temperature of the diethyl phosphite inside the reboiler 3 during heat exchange. Furthermore, the agitation effect continues as long as the heat transfer oil is in motion, with both moving simultaneously to prevent localized temperature changes in the diethyl phosphite during heat exchange.

[0058] It should also be noted that the protruding layer 518 on the outer side of the rotating sleeve 514 is used to achieve a stirring effect, and the diethyl phosphite can move along the heat conduction hole 519. The heat transfer oil in the rotating sleeve 514 fully exchanges heat with the diethyl phosphite, while also ensuring that the diethyl phosphite in other positions can also transfer heat evenly, so as to maintain the temperature as accurately as possible. It should be noted that how the heat transfer oil storage tank 4 is heated, the temperature that the diethyl phosphite in the reboiler 3 needs to be maintained at, and the temperature detection equipment are all existing technologies and will not be elaborated here.

[0059] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use. They 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. Therefore, they should not be construed as limitations on this utility model.

[0060] The diethyl phosphite distillation apparatus provided by this utility model has been described in detail above. Specific examples have been used to illustrate the principle and implementation of this utility model. The description of the above embodiments is only for the purpose of helping to understand this utility model and its core ideas. It should be noted that for those skilled in the art, several improvements and modifications can be made to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

Claims

1. A diethyl phosphite distillation apparatus, comprising a reboiler, wherein a heat transfer oil storage tank for heating the liquid inside the reboiler is provided outside the reboiler, characterized in that, A control unit is installed between the reboiler and the heat transfer oil storage tank for transferring liquid and uniformly controlling the liquid temperature. The control unit includes: The shaft consists of an inner and outer double-layered tube, used to connect the reboiler and the heat transfer oil storage tank. The inner tube has an inner spiral that drives the movement of the heat transfer oil. The drive unit, located outside the reboiler, is used to drive the shaft to accelerate or decelerate its rotation.

2. The diethyl phosphite distillation apparatus according to claim 1, characterized in that, The shaft includes a fixed tube body, an outer sleeve, a rotating sleeve, and an inner guide tube; The fixed tube body has an outer layer on the outside, which is rotatably embedded inside the outer sleeve. The outer sleeve is fixed to the reboiler. Both ends of the fixed tube body extend into the reboiler and the heat transfer oil storage tank, respectively. The fixed tube body is fixed to the heat transfer oil storage tank. The rotating sleeve is located inside the reboiler and is fixed to the end of the fixed tube body. The inner guide tube is located inside the rotating sleeve and extends from the fixed tube body into the heat transfer oil storage tank. The diameter of the inner guide tube is smaller than the inner diameter of the fixed tube body and the rotating sleeve. A supporting rod is fixed between one end of the inner guide tube and the inner wall of the rotating sleeve.

3. The diethyl phosphite distillation apparatus according to claim 2, characterized in that, The rotating sleeve is made of thin-walled metal and has an integrally formed protrusion on its outer side along its axis. The protrusion is used to stir the liquid inside the reboiler.

4. The diethyl phosphite distillation apparatus according to claim 3, characterized in that, The protruding layer has heat-conducting holes that penetrate the protruding layer. The heat-conducting holes are integrally formed with the protruding layer using sheet metal tubes. The heat-conducting holes are used to increase the contact area with the liquid inside the reboiler.

5. The diethyl phosphite distillation apparatus according to claim 2, characterized in that, The inner spiral is fixed inside the inner catheter and is a thin metal sheet.

6. The diethyl phosphite distillation apparatus according to claim 5, characterized in that, The inner helix has a through hole extending along its axial direction.

7. The diethyl phosphite distillation apparatus according to claim 2, characterized in that, The drive unit includes a servo motor, gear one, and gear two; The servo motor is installed on the outside of the reboiler. Gear 1 is fixed to the output end of the servo motor, and gear 2 is fixed to the fixed tube body. Gear 1 and gear 2 mesh.

8. The diethyl phosphite distillation apparatus according to claim 1, characterized in that, The exterior of the heat transfer oil storage tank has a heating layer for heating the heat transfer oil storage tank.

9. The diethyl phosphite distillation apparatus according to claim 1, characterized in that, A distillation column is connected to the outside of the reboiler to fractionate the liquid inside the reboiler.

10. The diethyl phosphite distillation apparatus according to claim 9, characterized in that, A heat exchanger is connected to the outside of the distillation column to condense the light component vapor at the top of the column into liquid.

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