Glycerol triacetate production and processing system, esterification kettle and esterification method

Abstract

The invention belongs to the technical field of esterification systems, and discloses a glyceryl triacetate production and processing system, an esterification kettle and an esterification method.The glyceryl triacetate production and processing system comprises the esterification kettle, a dehydration kettle, a pre-deacidification kettle, an acylation kettle and a high deacidification kettle, a conveying pipe is connected between the esterification kettle and the dehydration kettle, and a conveying pump is connected into the conveying pipe; materials in the esterification kettle are conveyed into the dehydration kettle through the conveying pump, the upper end of the esterification kettle is fixedly connected with a plurality of feeding pipes, the feeding pipes are connected with external feeding equipment, stirring blades are rotationally connected into the esterification kettle, the esterification reaction in the esterification kettle is accelerated through rotation of the stirring blades, and a dehydration device is arranged in the dehydration kettle. The dehydration device comprises multiple stages of dehydration structures, the multiple stages of dehydration structures are connected end to end up and down, each dehydration structure comprises a heating cylinder coaxially arranged with the dehydration kettle, a rotating cylinder is coaxially and rotatably connected in the heating cylinder, a plurality of water permeable holes are formed in the rotating cylinder, a high-temperature annular plate is coaxially connected to the inner wall of the heating cylinder, and practicability is high.

Description

Technical Field

[0001] The 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 and sweet taste. It has a bitter taste at low concentrations and can be used in daily chemical flavor formulations, mainly as a fixative. Glyceryl triacetate is an intermediate for many fine chemical products. Its consumption in my country is over 10,000 tons, and it is a very popular chemical raw material. One of the factors that affect the quality of glyceryl triacetate products is the moisture content.

[0003] A Chinese patent application with application number CN202410440378.7 discloses a dehydration device for the production of triacetin. By installing devices such as a screw lifter, a lifting screw and a conductive coil, the dehydration cylinder is heated by the conductive coil. 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, while avoiding the situation where the center temperature of the dehydration cylinder is lower than the inner wall temperature, resulting in uneven heating of the triacetin and poor dehydration effect. By installing devices such as 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 rotational motion of the evaporation rod can also increase the contact area between the triacetin and the inner wall of the dehydration cylinder, thereby improving the heat transfer effect and increasing 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 increasing 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, and 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, and the gas is discharged upward from the air outlet of the turntable, collides with the molecules in the liquid, and causes the volatile components in the liquid to evaporate quickly, and 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] The 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 the triacetin raw material in the reactor body is stirred, 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, so that the temperature of the triacetin at different depths in the reactor body can be measured. 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 the device. However, in actual applications, the following problems still exist, specifically: 1. In the existing triacetin preparation process, most of the water is removed by layered diversion, but the water removal effect is not good, the accuracy of triacetin cannot be guaranteed, and the water is discharged by diversion of water body, which is inefficient; 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, which wastes resources and cannot effectively achieve the coordination between feeding and discharging. 3. When dehydrating the esterified product, it is often directly heated 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.

[0005] 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

[0006] In view of the above situation, in order to overcome the defects 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.

[0007] 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. The delivery pump delivers the material in the esterification kettle to the inside of the dehydration kettle. The upper end of the esterification kettle is fixedly connected with a plurality of feed pipes, the feed pipes are connected with external feeding equipment, and the interior of the esterification kettle is rotatably connected with stirring blades, and the esterification reaction inside the esterification kettle is accelerated by the rotation of the stirring blades; A dehydration device is arranged inside the dehydration kettle, and the dehydration device comprises a multi-stage dehydration structure, and the multi-stage dehydration structures are connected end to end, and the dehydration structure comprises a heating cylinder coaxially arranged with the dehydration kettle, and a rotating cylinder is coaxially connected to the heating cylinder, and 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, and the high-temperature annular plate is connected to an electric heating device arranged inside the heating cylinder; The lower end of the heating cylinder is in a truncated cone shape, and 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, and the lower end of the lowermost heating cylinder is connected to an external storage device; A plurality of exhaust holes are provided at the upper end of the heating cylinder, 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; The lower end of the dehydration kettle is fixedly connected with a liquid discharge pipe, and the liquid discharge pipe is connected with an external liquid collection bucket.

[0008] Preferably, several of the rotating cylinders are coaxially fixedly connected, the uppermost rotating cylinder is coaxially fixedly connected with a rotating rod, the upper end of the rotating rod is coaxially fixedly connected with an intermediate rod sleeve, the intermediate rod sleeve is connected to the driving shaft connected to the inside of the dehydration kettle through a sprocket transmission mechanism and a chain transmission mechanism, and the driving shaft is connected to a driving motor connected to the upper end of the dehydration kettle.

[0009] 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 a plurality of liquid permeable holes are opened at the lower end of the intermediate rod sleeve, and liquid is supplied to the interior of the rotating cylinder at the uppermost end through the liquid inlet pipe, the intermediate rod sleeve and the liquid permeable holes.

[0010] Preferably, a synchronous rotating frame is provided on the coaxial fixed sleeve outside the intermediate rod sleeve, 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, so that the liquid can be guided by the wedge ring.

[0011] 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.

[0012] 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 conveying pipe; An upper sealing plug is coaxially connected to the lower part of the feed pipe for vertical sliding connection, a lower sealing plug is coaxially connected to the upper part of the feed 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 the 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; The upper end of the lifting shaft is fixedly connected with a lifting plate, the lifting plate is threadedly connected to an adjusting screw rotatably connected inside the esterification kettle, and the adjusting screw is connected to an adjusting motor connected to the esterification kettle; The lifting shaft rod is slidably connected to a driving rod rotatably connected inside the esterification kettle in an up-and-down manner, and the driving rod is connected to a driving motor rotatably connected to the esterification kettle.

[0013] 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 via a spring; The upper end of the lower casing is coaxially fixedly connected with a lower support ring, and the lower support ring and the lower sealing plug are connected via a spring.

[0014] The esterification method for producing triacetin is as follows: In the initial state, the feed pipe is open and the discharge pipe is closed; Step 1: firstly, placing the raw materials into the esterification kettle through the feed pipe; Step 2: The raw materials entering the esterification kettle rapidly undergo esterification reaction under the stirring action of the stirring blades to obtain the corresponding esterified product; 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; 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, and the dehydrated esterified product enters the subsequent process through the drainage pipe; Step 5: The dehydrated ester is sequentially subjected to pre-deacidification, acylation and high deacidification treatments.

[0015] The present invention improves the existing esterification system of triacetin and has the following beneficial effects: 1. The heating cylinder, rotating cylinder, water-permeable holes, high-temperature annular plates, exhaust holes and other structures are provided to effectively solve the problem of efficient dehydration of the esterified product. The esterified product is sprinkled on the high-temperature annular plate to increase the high-temperature contact area, which can effectively remove the moisture in the esterified product. 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 liquefaction from contacting 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 cylinder after liquefaction; 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 rod, a lifting plate, an adjusting screw and a driving rod, the problem of feeding and discharging in 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 raw materials is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the present invention.

[0017] Figure 2 It is a schematic diagram of the internal structure of the dehydration kettle of the present invention.

[0018] Figure 3 It is a schematic diagram of the internal structure of the heating tube of the present invention.

[0019] Figure 4 It is a schematic diagram of the internal structure of the esterification kettle of the present invention.

[0020] Figure 5 Schematic diagram of the lifting shaft and its connecting parts of the present invention Figure 1 .

[0021] Figure 6 Schematic diagram of the lifting shaft and its connecting parts of the present invention Figure 2 .

[0022] Figure 7 For the present invention Figure 6 A partial enlarged schematic diagram in the middle.

[0023] Figure 8 For the present invention Figure 6 A partial enlarged schematic diagram of point B in the middle.

[0024] 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. Inlet pipe; 16. Liquid permeable hole; 17. Synchronous rotating frame; 18. Rotating scraper; 19. Wedge ring; 20. Annular ventilation bin; 21. Exhaust pores; 22. Conical guide sleeve; 23. Feeding pipe; 24. Discharging pipe; 25. Upper plug; 26. Upper sleeve; 27. Lower plug; 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

[0025] The above and other technical contents, features and effects of the present invention are described in detail 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 drawings in the specification.

[0026] Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0027] 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 by the esterification kettle 1, and the esterification product is dehydrated by the dehydration kettle 2. Then, the dehydrated esterification product is 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 material in the esterification kettle 1 is delivered to the inside of the dehydration kettle 2 by the delivery pump.

[0028] The upper end of the esterification kettle 1 is fixedly connected with a plurality of feed pipes 4, and the feed pipes 4 are connected with external feeding equipment. Materials are fed into the esterification kettle 1 through the feed pipes 4, so as to facilitate the esterification reaction in the esterification kettle 1. A stirring blade is rotatably connected inside the esterification kettle 1, and the esterification reaction inside the esterification kettle 1 is accelerated by the rotation of the stirring blade. The stirring blade stirs the materials inside the esterification kettle 1, so as to ensure that the esterification reaction can be fully carried out inside the esterification kettle 1.

[0029] 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, and the multi-stage dehydration structure is connected end to end, so as 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, and a plurality of water-permeable holes 8 are opened on the rotating cylinder 7. 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 and the arrangement 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 inside 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 is converted into water vapor and evaporated, and the esterified product remains in the heating cylinder 6 and continues to flow downward, and multi-stage high-temperature evaporation is performed to effectively evaporate the moisture in the esterified product to obtain the corresponding refined product.

[0030] The lower end of the heating cylinder 6 is in the shape of a truncated cone. The lower end of the heating cylinder 6 on the upper side is placed inside the rotating cylinder 7 below, and the dehydrated material is transported to the inside of the rotating cylinder 7 at the next level. The lower end of the heating cylinder 6 at the lowest end is connected to an external receiving device, and the dehydrated esterified product is collected and processed through the external receiving device.

[0031] 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, 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 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.

[0032] The lower end of the dehydration kettle 2 is fixedly connected with 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, and the inner wall of the dehydration kettle 2 is cooled by the refrigerator, thereby realizing the liquefaction of the water vapor entering the dehydration kettle 2, which is convenient for the liquefied collection of the separated water vapor.

[0033] In 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 to obtain the corresponding esterified product. The esterified product after esterification 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 to separate the water vapor and liquefy it, and then is 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.

[0034] 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 cylinders 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 esterification solution into the heating cylinder 6.

[0035] 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 esterification solution to smoothly enter 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 esterification is filled into the interior of the rotating cylinder 7 through the liquid permeable holes 16 during the liquid delivery process.

[0036] 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, the present 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.

[0037] 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, reduce the influence 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 exhaust holes 21 connected to the annular ventilation bin 20 are opened on the outer wall of the heating tube 6. The annular ventilation bin 20 is connected to an 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 is discharged to the inside of the dehydration kettle 2 through the exhaust holes 21, thereby driving the air flow to the side away from the heating tube 6, so that the water vapor is transported to the outside and liquefied on the inner wall of the dehydration kettle 2 during the flow of the air flow.

[0038] 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, and the discharge pipe 24 is connected to the conveying pipe 3. The material is fed into the esterification kettle 1 through the discharge pipe 23, and the esterified product is conveyed to the dehydration kettle 2 through the discharge pipe 24.

[0039] 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 part of the feed pipe 4 for sliding up and down. Through the cooperation of the upper sealing plug 25 and the feed pipe 4, the feeding control of the esterification kettle 1 is realized. A lower sealing plug 27 is coaxially connected to the upper part of the discharge pipe 23 for sliding up and down. Through the cooperation of the lower sealing plug 27 and the discharge control of the esterification kettle 1 is realized. 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 lifted and lowered synchronously, thereby realizing the alternating opening of the feed pipe 4 and the opening of the lower 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 esterification reaction.

[0040] The upper end of the lifting shaft 29 is fixedly connected with 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, and the adjusting screw 32 is connected to an 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.

[0041] The lifting shaft 29 is slidably connected to a driving rod 33 rotatably connected inside the esterification kettle 1, and the driving rod 33 is connected to a driving motor rotatably connected to the esterification kettle 1. The driving motor drives the driving rod 33, and the lifting shaft 29 can be effectively driven to rotate while the lifting shaft 29 is lifted and lowered.

[0042] 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 with 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 with a lower support ring 35, and the lower support ring 35 and the lower sealing plug 27 are connected by a spring. When the upper sleeve 26 slides upward, the discharge pipe 23 is closed. After the closing is completed, the lifting shaft 29 continues to rise, and the spring contracts. At the same time, the spring connected to the lower end and the lower sealing plug 27 is reset first, and then the lower sealing plug 27 is moved up to open the discharge pipe 24, thereby ensuring that the discharge pipe 24 is opened only after the discharge pipe 23 is closed. Anyway, the lower sealing plug 27 is closed first, and then the discharge pipe 23 is opened, to ensure the coordination between the discharge pipe 23 and the discharge pipe 24, and the alternation of feeding and discharging.

[0043] When the present invention is used specifically, in the initial state, the raw materials are first placed in 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 feed 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 dehydration kettle 2 through the delivery pump, and then transported to the uppermost rotating cylinder 7. 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 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.

[0044] The above-mentioned 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 substitutions made by technicians in this field on the basis of the present invention shall 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 then the dehydrated esterification product is 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), the feed pipes (4) are connected to external feeding equipment, and the interior of the esterification kettle (1) is rotatably connected to a stirring blade, and the esterification reaction inside the esterification kettle (1) is accelerated by the rotation of the stirring blade; The dehydration kettle (2) is provided with a dehydration device, the dehydration device comprises a multi-stage dehydration structure, the multi-stage dehydration structure is connected end to end, the dehydration structure comprises a heating cylinder (6) coaxially arranged with the dehydration kettle (2), a rotating cylinder (7) is coaxially rotatably connected inside the heating cylinder (6), a plurality of water permeable holes (8) are provided on the rotating cylinder (7), a high-temperature annular plate (9) is coaxially connected to the inner wall of the heating cylinder (6), 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 lower rotating cylinder (7) to transport the dehydrated material to the lower rotating cylinder (7). The lower end of the lowermost heating cylinder (6) is connected to an external storage device. A plurality of exhaust holes (10) are provided at the upper end of the heating cylinder (6), 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 liquid discharge pipe (11), and the liquid discharge pipe (11) is connected to an external liquid collection bucket.

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 with a rotating rod (12), 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 a driving shaft connected to the inside of the dehydration kettle (2) through a sprocket transmission mechanism and a chain transmission mechanism, and the driving shaft is connected to a driving 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: A synchronous rotating frame (17) is coaxially fixedly mounted on the periphery of the intermediate rod sleeve (13). A plurality of rotating scrapers (18) are fixedly connected to the synchronous rotating frame (17). The rotating scrapers (18) fit 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 liquid is guided by the wedge ring.

5. The triacetin production and processing system according to claim 4, characterized in that: An annular ventilation chamber (20) is provided inside the side wall of the heating tube (6), and exhaust holes (21) connected to the annular ventilation chamber (20) are provided on the outer wall of the heating tube (6). The annular ventilation chamber (20) is connected to an external air supply device.

6. An esterification kettle (1), characterized in that: The esterification kettle (1) is applied to the triacetin production and processing system according to claim 5, wherein a conical guide sleeve (22) is fixedly connected to the upper side of the interior of the esterification kettle (1), 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), and the discharge pipe (24) is connected to the conveying pipe (3); An upper sealing plug (25) is coaxially connected to the lower part of the feed pipe (4) for vertical sliding, and a lower sealing plug (27) is coaxially connected to the upper part of the feed pipe (23) for vertical sliding. The upper sealing plug (25) is coaxially connected to an upper sleeve (26), and the lower sealing plug (27) is coaxially connected to a lower sleeve (28). The upper sleeve (26) and the lower sleeve (28) are both coaxially connected to a lifting shaft (29) rotatably connected to the axis of the esterification kettle (1). The stirring blade is coaxially fixedly connected to the lifting shaft (29), and the rotation of the lifting shaft (29) drives the stirring blade to rotate synchronously. The upper end of the lifting shaft (29) is fixedly connected to a lifting plate (31), the lifting plate (31) is threadedly connected to an adjusting screw (32) rotatably connected to the inside of the esterification kettle (1), and the adjusting screw (32) is connected to an adjusting motor connected to the esterification kettle (1); The lifting shaft (29) is slidably connected to a driving rod (33) rotatably connected inside the esterification kettle (1) up and down, and the driving rod (33) is connected to a driving motor rotatably connected to the esterification kettle (1).

7. An esterification kettle (1) according to claim 6, characterized in that: The upper sealing plug (25) and the upper sleeve (26) are slidably connected up and down, the lower end of the upper sleeve (26) is coaxially fixedly connected with an upper support ring (34), and the upper support ring (34) and the upper sealing plug (25) are connected via a spring; The upper end of the lower sleeve (28) is coaxially fixedly connected to a lower support ring (35), and the lower support ring (35) and the lower sealing plug (27) are connected via a spring.

8. An esterification method for producing triacetin, characterized in that: Using the production and processing system of triacetin in claim 7, the specific method is as follows: Step 1: firstly, placing the raw materials into the esterification kettle (1) through the feed pipe (4); Step 2: The raw materials entering the esterification kettle (1) rapidly undergo esterification reaction under the stirring action of the stirring blades, thereby obtaining the corresponding esterified product; Step 3: After the esterification is completed, the esterified product is transported to the inside of the dehydration kettle (2) through the transport pump, and then transported to the inside 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 treatments.

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