Triacetin production and processing system, esterification kettle and esterification method

Abstract

The invention belongs to the technical field of esterification systems and discloses a triacetin production and processing system, an esterification kettle and an esterification method. The system comprises an esterification kettle, a dehydration kettle, a pre-deacidification kettle, an acylation kettle and a high-deacidification kettle. A delivery pipe is connected between the esterification kettle and the dehydration kettle, a delivery pump is connected inside the delivery pipe, and substances in the esterification kettle are delivered to the dehydration kettle through the delivery pump. The upper end of the esterification kettle is fixedly connected to a plurality of feed pipes, and the feed pipes are connected to external feeding equipment. A stirring blade is rotatably connected inside the esterification kettle, and the esterification reaction in the esterification kettle is accelerated by the rotation of the stirring blade. A dehydration device is arranged inside the dehydration kettle, and the dehydration device comprises a multi-stage dehydration structure, which is connected end to end in upper and lower parts. The dehydration structure comprises a heating cylinder coaxially arranged with the dehydration kettle, a rotating cylinder is coaxially rotatably connected inside the heating cylinder, a plurality of water-permeable holes are opened on the rotating cylinder, and a high-temperature annular plate is coaxially connected to the inner wall of the heating cylinder. The system has strong practicality.

Description

Technical Field

[0001] The present invention relates to the technical field of esterification systems, in particular to a triacetin production and processing system, an esterification kettle and an esterification method. Background Art

[0002] Glyceryl triacetate is an organic compound, a colorless, oily liquid with a faint fruity, meaty, and sweet flavor, but a bitter taste at low concentrations. It is used in fragrance formulations, primarily as a fixative. Glyceryl triacetate is an intermediate for many fine chemical products, with consumption exceeding 10,000 tons in my country, making it a highly sought-after chemical raw material. Moisture content is one factor that affects the quality of finished triacetin products.

[0003] The Chinese patent application number CN202410440378.7 discloses a dehydration device for the production of triacetin. By installing a screw lifter, a lifting screw and a conductive coil, the conductive coil is used to heat the dehydration cylinder. Since the conductive coil is energized to generate a magnetic field, the gadolinium metal plate enters the magnetic field and is magnetized to generate heat, thereby making the heating rate of the dehydration cylinder faster and avoiding the temperature in the center of the dehydration cylinder being lower than the temperature of the inner wall, which causes uneven heating of the triacetin and poor dehydration effect. By installing a turntable and an evaporation rod, the evaporation rod rotates with the turntable, which can evenly distribute and heat the liquid, help control the temperature distribution in the evaporation cylinder, avoid the formation of high-temperature areas or cooling areas, and maintain the stability of the evaporation process. The rotation of the evaporation rod can also increase the contact area between the triacetin and the inner wall of the dehydration cylinder, improve the heat transfer effect, and increase the dehydration effect. Fast evaporation rate; by installing devices such as atomizing rotary nozzles and feed pipes, the atomizing rotary nozzles can atomize triacetin into fine droplets and evenly distribute them in the dehydration cylinder, increasing the surface area of the liquid and thus improving the evaporation rate; by installing devices such as air compressors, vortex tubes and hot air pipes, heated gas is introduced into the interior of the dehydration cylinder to increase the internal temperature of the dehydration cylinder, thereby accelerating the evaporation rate. The pressurized gas drives the fan blades to rotate without the need for electric drive, thus avoiding energy loss in the process of electric energy conversion. The gas is discharged upward from the air outlet of the turntable and collides with the molecules in the liquid, prompting the volatile components in the liquid to evaporate quickly. The gas moves upward from the bottom to generate rising bubbles, which push the volatile components in the liquid to mix and diffuse upward, which helps to evenly distribute the volatile components and improve the uniformity and stability of evaporation.

[0004] Chinese patent application number CN202323093247.6 discloses a reactor for pharmaceutical-grade triacetin. This application uses a design in which a No. 1 motor drives three stirring shafts to rotate simultaneously. When stirring the triacetin raw material in the reactor body, the triacetin raw material can be subjected to stirring forces from different directions, making the stirring of the triacetin more uniform and improving the stirring efficiency. The temperature sensor can be raised and lowered in the reactor body to measure the temperature of the triacetin at different depths in the reactor body. After receiving the signal from the temperature sensor, the user can judge the uniformity of the stirring of the triacetin based on the received temperature information, thereby improving the convenience of using this device. However, in actual applications, the following problems still exist, specifically:

[0005] 1. In the existing triacetin preparation process, most of the water is removed by layered diversion, but the water removal effect is poor and the accuracy of triacetin cannot be guaranteed. In addition, the water is discharged by diversion of the water body, which is inefficient.

[0006] 2. During the esterification reaction, the feeding and discharging cannot be effectively unified and need to be controlled separately. Feeding and discharging at the same time will affect the reaction effect and cause incomplete reaction, waste resources, and fail to effectively achieve the coordination between feeding and discharging.

[0007] 3. When dehydrating the esterified product, it is often heated directly to generate steam for dehydration, which is inefficient and cannot fully evaporate the water. The evaporation efficiency is low and the dehydration accuracy cannot be effectively guaranteed.

[0008] Therefore, the present invention provides a triacetin production and processing system, an esterification kettle and an esterification method to solve the above problems. Summary of the Invention

[0009] In view of the above situation and to overcome the shortcomings of the prior art, the present invention provides a triacetin production and processing system, an esterification kettle and an esterification method, which effectively solve the problems of coordinated control of loading and unloading materials inside the esterification kettle, poor dehydration effect and dehydration method, resulting in unattainable dehydration accuracy or low dehydration efficiency.

[0010] The present invention comprises an esterification kettle, a dehydration kettle, a pre-deacidification kettle, an acylation kettle and a high-deacidification kettle. A delivery pipe is connected between the esterification kettle and the dehydration kettle. A delivery pump is connected inside the delivery pipe to deliver the material in the esterification kettle to the inside of the dehydration kettle through the delivery pump.

[0011] The upper end of the esterification kettle is fixedly connected to a plurality of feed pipes, which are connected to external feeding equipment. The interior of the esterification kettle is rotatably connected to a stirring blade, and the rotation of the stirring blade accelerates the esterification reaction inside the esterification kettle.

[0012] The dehydration kettle is provided with a dehydration device, which includes a multi-stage dehydration structure, wherein the multi-stage dehydration structures are connected end to end, and the dehydration structure includes a heating cylinder coaxially arranged with the dehydration kettle, wherein a rotating cylinder is coaxially connected to the heating cylinder, wherein a plurality of water-permeable holes are provided on the rotating cylinder, and a high-temperature annular plate is coaxially connected to the inner wall of the heating cylinder, wherein the high-temperature annular plate is connected to an electric heating device disposed inside the heating cylinder;

[0013] The lower end of the heating cylinder is in the shape of a truncated cone. The lower end of the upper heating cylinder is placed inside the rotating cylinder below to transport the dehydrated material to the rotating cylinder of the next level. The lower end of the lowermost heating cylinder is connected to an external storage device.

[0014] The upper end of the heating cylinder is provided with a plurality of exhaust holes, the exhaust holes are connected to the interior of the dehydration kettle, and the interior of the dehydration kettle is connected to an external negative pressure device, so that the air pressure inside the dehydration kettle is lower than the air pressure inside the heating cylinder;

[0015] The lower end of the dehydration kettle is fixedly connected with a liquid discharge pipe, and the liquid discharge pipe is connected to an external liquid collecting bucket.

[0016] Preferably, several of the rotating cylinders are coaxially fixedly connected, the rotating cylinder at the upper end is coaxially fixedly connected to a rotating rod, the upper end of the rotating rod is coaxially fixedly connected to an intermediate rod sleeve, the intermediate rod sleeve is connected to the drive shaft connected to the inside of the dehydration kettle through a sprocket transmission mechanism through a chain transmission mechanism, and the drive shaft is connected to the drive motor connected to the upper end of the dehydration kettle.

[0017] Preferably, the upper end of the intermediate rod sleeve is rotatably connected to a liquid inlet pipe, the liquid inlet pipe is communicated with the delivery pipe, and the lower end of the intermediate rod sleeve is provided with a plurality of liquid holes, through which liquid is supplied to the interior of the rotating cylinder at the uppermost end.

[0018] Preferably, the coaxial fixed sleeve outside the intermediate rod sleeve is provided with a synchronous rotating frame, and a plurality of rotating scrapers are fixedly connected to the synchronous rotating frame. The rotating scrapers are in contact with the inner wall of the dehydration kettle, and a wedge ring is fixedly connected to the bottom end of the dehydration kettle, and the liquid is guided by the wedge ring.

[0019] Preferably, an annular ventilation bin is provided inside the side wall of the heating tube, and exhaust holes connected to the annular ventilation bin are provided on the outer wall of the heating tube, and the annular ventilation bin is connected to an external air supply device.

[0020] Preferably, a conical guide sleeve is fixedly connected to the upper side of the interior of the esterification kettle, a discharge pipe is coaxially fixedly connected to the lower end of the conical guide sleeve, a discharge pipe is fixedly connected to the lower end of the esterification kettle, and the discharge pipe is connected to the delivery pipe;

[0021] An upper sealing plug is coaxially connected to the lower portion of the feed pipe for vertical sliding connection, a lower sealing plug is coaxially connected to the upper portion of the discharge pipe for vertical sliding connection, an upper sleeve is coaxially connected to the upper sealing plug, and a lower sleeve is coaxially connected to the lower sealing plug. Both the upper sleeve and the lower sleeve are coaxially connected to a lifting shaft rotatably connected to the axis of the esterification kettle, the stirring blade is coaxially fixedly connected to the lifting shaft, and the rotation of the lifting shaft drives the stirring blade to rotate synchronously;

[0022] The upper end of the lifting shaft is fixedly connected to a lifting plate, the lifting plate is threadedly connected to an adjusting screw rotatably connected to the inside of the esterification kettle, and the adjusting screw is connected to an adjusting motor connected to the esterification kettle;

[0023] The lifting shaft is slidably connected to a driving rod rotatably connected inside the esterification kettle, and the driving rod is connected to a driving motor rotatably connected to the esterification kettle.

[0024] Preferably, the upper sealing plug and the upper sleeve are slidably connected up and down, the lower end of the upper sleeve is coaxially fixedly connected with an upper support ring, and the upper support ring and the upper sealing plug are connected by a spring;

[0025] The upper end of the lower sleeve is coaxially fixedly connected with a lower support ring, and the lower support ring and the lower sealing plug are connected via a spring.

[0026] The esterification method for producing triacetin is as follows:

[0027] In the initial state, the feed pipe is open and the discharge pipe is closed;

[0028] Step 1: First, the raw materials are placed inside the esterification kettle through the feed pipe;

[0029] Step 2: The raw materials entering the esterification kettle undergo rapid esterification reaction under the stirring action of the stirring blades to obtain the corresponding esterified product;

[0030] Step 3: After the esterification is completed, the esterified product is transported to the inside of the dehydration kettle through the transport pump, and then transported to the inside of the rotating drum at the top;

[0031] Step 4: The esterified product undergoes a multi-stage dehydration reaction to separate the water vapor into liquefaction and then discharge it to the outside. At the same time, the dehydrated esterified product enters the subsequent process through the drainage pipe;

[0032] Step 5: The dehydrated ester is sequentially subjected to pre-deacidification, acylation, and high deacidification treatment.

[0033] The present invention improves the existing esterification system of triacetin and has the following beneficial effects:

[0034] 1. The heating cylinder, rotating cylinder, water-permeable holes, high-temperature annular plate, exhaust holes and other structures are provided to effectively solve the problem of efficient dehydration of the esterified product. The esterified product is sprinkled onto the high-temperature annular plate to increase the high-temperature contact area, which can effectively remove the moisture in the esterified product.

[0035] 2. The annular ventilation chamber, exhaust system, synchronous rotating frame, rotating scraper and other structures are set up to effectively solve the problems of guiding high-temperature steam, avoiding contact and liquefaction with the outer wall of the heating cylinder, reducing the temperature of the heating cylinder, and cleaning and collecting the water vapor adhering to the liquefied steam;

[0036] 3. By setting up structures such as a conical guide sleeve, a feed pipe, a discharge pipe, an upper sealing plug, a lower sealing plug, an upper casing, a lower casing, a lifting shaft, a lifting plate, an adjusting screw and a driving rod, the problem of feeding and discharging the esterification kettle is effectively solved, and the opening and closing of the feed pipe and the discharge pipe are coordinated to ensure that the feed pipe and the discharge pipe are opened alone, so as to ensure that the esterification reaction can be fully carried out and the utilization rate of the raw materials is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0038] Figure 2 It is a schematic diagram of the internal structure of the dehydration kettle of the present invention.

[0039] Figure 3 This is a schematic diagram of the internal structure of the heating tube of the present invention.

[0040] Figure 4 It is a schematic diagram of the internal structure of the esterification kettle of the present invention.

[0041] Figure 5 Schematic diagram of the lifting shaft and its connecting parts of the present invention Figure 1 .

[0042] Figure 6 Schematic diagram of the lifting shaft and its connecting parts of the present invention Figure 2 .

[0043] Figure 7 For the present invention Figure 6 A partial enlarged schematic diagram of point A in the middle.

[0044] Figure 8 For the present invention Figure 6 A partial enlarged schematic diagram of point B in the middle.

[0045] Figure numerals: 1. esterification kettle; 2. dehydration kettle; 3. conveying pipe; 4. feeding pipe; 6. heating cylinder; 7. rotating cylinder; 8. water permeable hole; 9. high-temperature annular plate; 10. exhaust hole; 11. drain pipe; 12. rotating rod; 13. intermediate rod sleeve; 15. liquid inlet pipe; 16. liquid permeable hole; 17. synchronous rotating frame; 18. rotating scraper; 19. wedge ring; 20. annular ventilation bin; 21. exhaust pore; 22. conical guide sleeve; 23. discharge pipe; 24. discharge pipe; 25. upper seal; 26. upper sleeve; 27. lower seal; 28. lower sleeve; 29. lifting shaft; 31. lifting plate; 32. adjusting screw; 33. driving rod; 34. upper support ring; 35. lower support ring. DETAILED DESCRIPTION

[0046] The above and other technical contents, features and effects of the present invention are described below with reference to the attached Figures 1 to 8 The detailed description of the embodiments will clearly show that the structural contents mentioned in the following embodiments are all based on the accompanying drawings.

[0047] Various exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0048] The present invention comprises an esterification kettle 1, a dehydration kettle 2, a pre-deacidification kettle, an acylation kettle and a high-deacidification kettle. The esterification reaction is carried out in the esterification kettle 1, the esterification product is dehydrated in the dehydration kettle 2, and the dehydrated esterification product is then subjected to pre-deacidification treatment, acylation treatment and high-deacidification treatment to ensure the accuracy and concentration of the product. A delivery pipe 3 is connected between the esterification kettle 1 and the dehydration kettle 2, and a delivery pump is connected inside the delivery pipe 3. The delivery pump delivers the material in the esterification kettle 1 to the inside of the dehydration kettle 2.

[0049] The upper end of the esterification kettle 1 is fixedly connected to a plurality of feed pipes 4, which are connected to external feeding equipment. Materials are fed into the esterification kettle 1 through the feed pipes 4 to facilitate the esterification reaction in the esterification kettle 1. A stirring blade is rotatably connected to the inside of the esterification kettle 1. The rotation of the stirring blade accelerates the esterification reaction in the esterification kettle 1. The stirring blade stirs the material inside the esterification kettle 1 to ensure that the esterification reaction can be fully carried out inside the esterification kettle 1.

[0050] The dehydration kettle 2 is provided with a dehydration device, and the dehydration device inside the dehydration kettle 2 is used to dehydrate the material after the esterification reaction. In order to ensure that the material is fully dehydrated, the dehydration device includes a multi-stage dehydration structure. The multi-stage dehydration structure is connected end to end to achieve multi-stage dehydration of the material. The dehydration structure includes a heating cylinder 6 coaxially arranged with the dehydration kettle 2, and a rotating cylinder 7 is coaxially connected to the heating cylinder 6. The rotating cylinder 7 is provided with a number of water-permeable holes 8. The inner wall of the heating cylinder 6 is coaxially connected to a high-temperature annular plate 9, and the high-temperature annular plate 9 and the It is connected to the electric heating device inside the heating cylinder 6, and the high-temperature annular plate 9 is heated by the electric heating device, so that the high-temperature annular plate 9 is always in a high-temperature state. The esterified substance enters the interior of the rotating cylinder 7, and the rotating cylinder 7 rotates, and the substance in the rotating cylinder 7 is gradually thrown to the high-temperature annular plate 9 through the water-permeable holes 8. After the high-temperature heating of the high-temperature annular plate 9, the moisture in the substance turns into water vapor and evaporates. The esterified product remains in the interior of the heating cylinder 6 and continues to flow downward, performing multi-stage high-temperature evaporation to effectively evaporate the moisture in the esterified product to obtain the corresponding refined product.

[0051] The lower end of the heating cylinder 6 is in the shape of a truncated cone. The lower end of the upper heating cylinder 6 is placed inside the rotating cylinder 7 below, and the dehydrated material is transported to the inside of the rotating cylinder 7 of the next level. The lower end of the lowermost heating cylinder 6 is connected to the external receiving device, and the dehydrated esterification product is collected and processed through the external receiving device.

[0052] A plurality of exhaust holes 10 are provided at the upper end of the heating cylinder 6, and the exhaust holes 10 are connected to the interior of the dehydration kettle 2. The interior of the dehydration kettle 2 is connected to an external negative pressure device, so that the air pressure inside the dehydration kettle 2 is lower than the air pressure inside the heating cylinder 6. The water vapor generated during the dehydration process enters the interior of the dehydration kettle 2 through the exhaust holes 10. At the same time, since the dehydration kettle 2 is connected to the external negative pressure device, the water vapor continues to flow into the interior of the dehydration kettle 2 and then to the side of the negative pressure device, thereby realizing the separation of the water vapor and the esterified product.

[0053] The lower end of the dehydration kettle 2 is fixedly connected to a drain pipe 11, and the drain pipe 11 is connected to the external liquid collection bucket. At the same time, the inner wall of the dehydration kettle 2 is connected to a refrigerator. The refrigerator is used to cool the inner wall of the dehydration kettle 2, thereby liquefying the water vapor entering the dehydration kettle 2, which facilitates the liquefaction and collection of the separated water vapor.

[0054] During the specific implementation of this embodiment, the raw materials are first placed in the esterification kettle 1 through the feed pipe 4. The raw materials entering the esterification kettle 1 undergo an esterification reaction rapidly under the stirring action of the stirring blades, thereby obtaining the corresponding esterified product. After the esterification is completed, the esterified product is transported to the dehydration kettle 2 through the delivery pump, and then transported to the uppermost rotating drum 7. The esterified product undergoes a multi-stage dehydration reaction, and the water vapor is separated and liquefied before being discharged to the outside. At the same time, the dehydrated esterified product enters the liquid collecting barrel through the discharge pipe 11, completing the dehydration treatment of the esterified product and achieving the refining treatment of the esterified product.

[0055] In order to ensure that during the rotation of the rotating cylinder 7, the inside of the rotating cylinder 7 is effectively filled with materials, and the rotating cylinder 7 can rotate synchronously, several of the rotating cylinders 7 are coaxially fixedly connected to make the rotating cylinder 7 rotate synchronously. The rotating cylinder 7 at the upper end is coaxially fixedly connected with a rotating rod 12, and the upper end of the rotating rod 12 is coaxially fixedly connected with an intermediate rod sleeve 13. The intermediate rod sleeve 13 is connected to the driving shaft connected to the inside of the dehydration kettle 2 through a sprocket transmission mechanism. The driving shaft is connected to the driving motor connected to the upper end of the dehydration kettle 2. The driving motor rotates and drives the intermediate rod sleeve 13 to rotate synchronously through the sprocket transmission mechanism. During the rotation of the intermediate rod sleeve 13, the rotating rod 12 is driven to rotate synchronously. The rotation of the rotating rod 12 drives the rotating cylinder 7 to rotate, so as to realize the throwing of the esterified solution into the interior of the heating cylinder 6.

[0056] The upper end of the intermediate rod sleeve 13 is rotatably connected to a liquid inlet pipe 15, and the intermediate rod sleeve 13 and the liquid inlet pipe 15 rotate relative to each other, thereby facilitating the smooth entry of the esterified solution into the interior of the rotating cylinder 7. The liquid inlet pipe 15 is connected to the delivery pipe 3, and a plurality of liquid permeable holes 16 are provided at the lower end of the intermediate rod sleeve 13. Liquid is supplied to the interior of the uppermost rotating cylinder 7 through the liquid inlet pipe 15, the intermediate rod sleeve 13 and the liquid permeable holes 16. The esterified product is filled into the interior of the rotating cylinder 7 through the liquid permeable holes 16 during the liquid delivery process.

[0057] After the water vapor enters the dehydration kettle 2, the water vapor will condense and liquefy on the inner wall of the dehydration kettle 2. In order to clean the liquefied water vapor in time, this embodiment provides a scraping structure. Specifically, the coaxial fixed sleeve of the outer periphery of the intermediate rod sleeve 13 is provided with a synchronous rotating frame 17. During the rotation of the intermediate rod sleeve 13, the synchronous rotating frame 17 is driven to rotate synchronously. A plurality of rotating scrapers 18 are fixedly connected to the synchronous rotating frame 17. The rotating scrapers 18 are in contact with the inner wall of the dehydration kettle 2. A wedge ring 19 is fixedly connected to the bottom end of the dehydration kettle 2. The wedge ring 19 is used to guide the liquid. During the rotation of the synchronous rotating frame 17, the rotating scrapers 18 are driven to rotate synchronously, thereby driving the cleaning and collection of the liquefied water vapor. At the same time, the wedge ring 19 guides the liquid, which is convenient for the subsequent collection of the liquefied water vapor.

[0058] In order to prevent the water vapor from adhering to the outer wall of the heating tube 6, reduce the temperature inside the heating tube 6, and ensure that the water vapor can be better transported to the inside of the dehydration kettle 2, reducing the impact of water vapor liquefaction on the temperature of the heating tube 6, an annular ventilation bin 20 is opened inside the side wall of the heating tube 6, and the outer wall of the heating tube 6 is provided with exhaust holes 21 connected to the annular ventilation bin 20. The annular ventilation bin 20 is connected to the external air supply device, and the annular ventilation bin 20 is ventilated through the external air supply device. At the same time, the air flow passes through the exhaust holes 21 and is discharged to the inside of the dehydration kettle 2, thereby also driving the air flow to the side away from the heating tube 6, so that the water vapor is transported to the outside during the flow of the air flow and is liquefied on the inner wall of the dehydration kettle 2.

[0059] A conical guide sleeve 22 is fixedly connected to the upper side of the interior of the esterification kettle 1, and a discharge pipe 23 is coaxially fixedly connected to the lower end of the conical guide sleeve 22. A discharge pipe 24 is fixedly connected to the lower end of the esterification kettle 1. The discharge pipe 24 is connected to the conveying pipe 3. The material is fed into the interior of the esterification kettle 1 through the discharge pipe 23, and the esterified product is conveyed to the interior of the dehydration kettle 2 through the discharge pipe 24.

[0060] In order to ensure sufficient esterification and mixing of the raw materials, it is necessary to intermittently feed the esterification kettle 1, carry out the esterification reaction in batches, and ensure that the esterified product after complete esterification enters the next process. Therefore, this embodiment provides a structure that can ensure intermittent feeding and discharging. Specifically, an upper sealing plug 25 is coaxially connected to the lower side of the feed pipe 4 for sliding up and down. The cooperation between the upper sealing plug 25 and the feed pipe 4 is used to control the feeding of the esterification kettle 1. A lower sealing plug 27 is coaxially connected to the upper side of the discharge pipe 23 for sliding up and down. The cooperation between the lower sealing plug 27 and the discharge of the esterification kettle 1 is used to control the discharge of the esterification kettle 1. The upper sealing plug 25 is coaxially connected to the upper sleeve 26, and the lower sealing plug 27 is coaxially connected to the lower sleeve 28. The upper sleeve 26 and the lower sleeve 28 are both coaxially connected to the lifting shaft 29 rotatably connected to the axis of the esterification kettle 1. The lower sleeve 28 and the lifting shaft 29 are raised and lowered synchronously, thereby realizing the alternating opening of the feed pipe 4 and the opening of the discharge pipe 23, thereby ensuring that the material in the esterification kettle 1 is fully esterified. The stirring blade and the lifting shaft 29 are coaxially fixedly connected, and the rotation of the lifting shaft 29 drives the stirring blade to rotate synchronously, thereby ensuring the effective progress of the esterification reaction.

[0061] The upper end of the lifting shaft 29 is fixedly connected to a lifting plate 31, and the lifting plate 31 is threadedly connected to an adjusting screw 32 rotatably connected to the inside of the esterification kettle 1. The adjusting screw 32 is connected to the adjusting motor connected to the esterification kettle 1. The rotation of the adjusting motor drives the synchronous rotation of the adjusting screw 32, thereby driving the lifting plate 31 to rise and fall, and then driving the lifting shaft 29 to rise and fall, thereby realizing the control of the opening and closing of the feeding pipe 23 and the discharge pipe 24.

[0062] The lifting shaft 29 is connected to the driving rod 33 rotatably connected to the inside of the esterification kettle 1 in an up and down sliding manner. The driving rod 33 is connected to the driving motor rotatably connected to the esterification kettle 1. The driving rod 33 is driven by the driving motor. At the same time, the lifting shaft 29 can be effectively driven to rotate while the lifting shaft 29 is raised and lowered.

[0063] The upper sealing plug 25 and the upper sleeve 26 are slidably connected up and down, and the lower end of the upper sleeve 26 is coaxially fixedly connected to an upper support ring 34, and the upper support ring 34 and the upper sealing plug 25 are connected by a spring, and the upper end of the lower sleeve 28 is coaxially fixedly connected to the lower support ring 35, and the lower support ring 35 and the lower sealing plug 27 are connected by a spring.

[0064] When the present invention is used in practice, in the initial state, the raw materials are first placed inside the esterification kettle 1 through the feed pipe 4, and the discharge pipe 24 is closed. The raw materials entering the esterification kettle 1 undergo an esterification reaction rapidly under the stirring action of the stirring blades, thereby obtaining the corresponding esterified product. After the esterification is completed, the lifting shaft 29 rises, and the discharge pipe 23 is effectively closed. At the same time, after the closing is completed, the discharge pipe 24 is opened, and the esterified product is transported to the inside of the dehydration kettle 2 through the delivery pump, and then transported to the inside of the uppermost rotating cylinder 7. The esterified product undergoes a multi-stage dehydration reaction, and the water vapor is separated and liquefied and then discharged to the outside. At the same time, the dehydrated esterified product enters the liquid collecting barrel through the discharge pipe 11, completing the dehydration treatment of the esterified product and realizing the refining treatment of the esterified product.

[0065] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A triacetin production and processing system, comprising an esterification kettle (1), a dehydration kettle (2), a pre-deacidification kettle, an acylation kettle and a high-deacidification kettle, wherein the esterification reaction is carried out in the esterification kettle (1), the esterification product is dehydrated in the dehydration kettle (2), and the dehydrated esterification product is then subjected to pre-deacidification treatment, acylation treatment and high-deacidification treatment, characterized in that: A delivery pipe (3) is connected between the esterification kettle (1) and the dehydration kettle (2), and a delivery pump is connected inside the delivery pipe (3), and the material in the esterification kettle (1) is delivered to the inside of the dehydration kettle (2) through the delivery pump; The upper end of the esterification kettle (1) is fixedly connected to a plurality of feed pipes (4), and the feed pipes (4) are connected to external feeding equipment. The interior of the esterification kettle (1) is rotatably connected to a stirring blade (5), and the rotation of the stirring blade (5) is used to accelerate the esterification reaction inside the esterification kettle (1); The dehydration kettle (2) is provided with a dehydration device, the dehydration device includes a multi-stage dehydration structure, the multi-stage dehydration structure is connected end to end, the dehydration structure includes a heating cylinder (6) coaxially arranged with the dehydration kettle (2), the heating cylinder (6) is coaxially connected with a rotating cylinder (7), the rotating cylinder (7) is provided with a plurality of water-permeable holes (8), the inner wall of the heating cylinder (6) is coaxially connected with a high-temperature annular plate (9), and the high-temperature annular plate (9) is connected to an electric heating device arranged inside the heating cylinder (6); The lower end of the heating cylinder (6) is in the shape of a truncated cone. The lower end of the upper heating cylinder (6) is placed inside the rotating cylinder (7) below, and the dehydrated material is transported to the inside of the rotating cylinder (7) of the next level. The lower end of the lowermost heating cylinder (6) is connected to an external storage device. The upper end of the heating cylinder (6) is provided with a plurality of exhaust holes (10), the exhaust holes (10) are connected to the interior of the dehydration kettle (2), and the interior of the dehydration kettle (2) is connected to an external negative pressure device, so that the air pressure inside the dehydration kettle (2) is lower than the air pressure inside the heating cylinder (6); The lower end of the dehydration kettle (2) is fixedly connected to a drain pipe (11), and the drain pipe (11) is connected to an external liquid collection bucket; An annular ventilation chamber (20) is provided inside the side wall of the heating tube (6), and an exhaust hole (21) connected to the annular ventilation chamber (20) is provided on the outer wall of the heating tube (6). The annular ventilation chamber (20) is connected to an external air supply device.

2. The triacetin production and processing system according to claim 1, characterized in that: Several of the rotating cylinders (7) are coaxially fixedly connected, the uppermost rotating cylinder (7) is coaxially fixedly connected to a rotating rod (12), the upper end of the rotating rod (12) is coaxially fixedly connected to an intermediate rod sleeve (13), the intermediate rod sleeve (13) is connected to a drive shaft (14) connected to the inside of the dehydration kettle (2) through a sprocket transmission mechanism, and the drive shaft (14) is connected to a drive motor connected to the upper end of the dehydration kettle (2).

3. The triacetin production and processing system according to claim 2, characterized in that: The upper end of the intermediate rod sleeve (13) is rotatably connected to a liquid inlet pipe (15), the liquid inlet pipe (15) is communicated with the delivery pipe (3), and the lower end of the intermediate rod sleeve (13) is provided with a plurality of liquid permeable holes (16), through which liquid is supplied to the interior of the rotating cylinder (7) at the uppermost end.

4. The triacetin production and processing system according to claim 3, characterized in that: The intermediate rod sleeve (13) is coaxially fixed with a synchronous rotating frame (17) on its periphery. A plurality of rotating scrapers (18) are fixedly connected to the synchronous rotating frame (17). The rotating scrapers (18) fit in contact with the inner wall of the dehydration kettle (2). The bottom end of the dehydration kettle (2) is fixedly connected with a wedge ring (19). The liquid is guided by the wedge ring (19).

5. An esterification method for producing triacetin, characterized in that: The production and processing system of triacetin according to claim 4 is used, and the specific method is as follows: Step 1: First, the raw materials are placed inside the esterification kettle (1) through the feed pipe (4); Step 2: The raw materials entering the esterification kettle (1) are stirred by the stirring blades (5) and undergo an esterification reaction rapidly to obtain the corresponding esterified product; Step 3: After the esterification is completed, the esterified product is transported to the interior of the dehydration kettle (2) through the transport pump, and then transported to the interior of the rotating drum (7) at the top; Step 4: The esterified product undergoes a multi-stage dehydration reaction, so that the water vapor is separated and liquefied and then discharged to the outside. At the same time, the dehydrated esterified product enters the subsequent process through the drainage pipe (11); Step 5: The dehydrated ester is sequentially subjected to pre-deacidification, acylation, and high deacidification treatment.

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