Automatic control system for esterification process in glyceryl triacetate production process

Abstract

The utility model discloses an automatic control system for an esterification process in a glyceryl triacetate production process, which is characterized in that esterification materials are sequentially added into an esterification reactor through an esterification feeder; the esterification preheater, the esterification heater and the esterification cooler are used for regulating and controlling the temperature of a processing material in the esterification reactor, and the variable-speed mixer is used for stirring and mixing the processing material in the esterification reactor at variable speed; a driver is fixedly mounted on the upper surface of the esterification reactor, a stirring rod is connected to the lower output end of the driver, and a temperature controller is mounted outside the esterification reactor in a sleeving manner; a bearing frame is fixed to the outer side of the esterification reactor, a storage box is embedded in the upper portion of the bearing frame, and the upper portion of a conveying pipe is connected with a feeding pipe through a conveying pump. The automatic control system for the esterification process in the glyceryl triacetate production process is provided with the waste heat utilization mechanism and the speed-limiting stirring mechanism, so that the esterification production efficiency of glyceryl triacetate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of triacetin esterification process, in particular to an automatic control system for the esterification process in the production process of triacetin. Background Art

[0002] Glyceryl triacetate is an oily liquid and an intermediate in the preparation of some chemical products. During the processing of glyceryl triacetate, a variety of materials are introduced into an esterification reactor, and the temperature and stirring speed are adjusted to control the rapid mixing and esterification reaction of the processed materials.

[0003] The esterification reaction device and esterification reaction method disclosed in the publication number CN113840650A include: a reaction tank, which is formed with a containing portion for containing raw materials, wherein the raw materials include supplied carboxylic acid and alcohol; a heating unit, which is used to independently heat each partition area divided into N areas in the vertical direction of the containing portion; and a controller, which is used to control the heating unit so as to heat only the partition area in which the liquid is placed among the N partition areas, wherein the esterification reaction of the raw materials occurs; however, the esterification reaction device is not convenient for regulating the mixing speed of the reaction materials, which is not conducive to rapid and uniform mixing of the reaction materials.

[0004] The existing partial esterification reactor is not convenient for controlling the speed of mixing esterification reaction materials when in use. The processing materials at different stages of the esterification reaction require different mixing speeds, and the constant speed stirring and mixing structure is not conducive to the rapid and uniform mixing of the processing materials. Therefore, it is necessary to design an automatic control system for the esterification process in the production process of triacetin to address the above problems. Summary of the invention

[0005] The utility model aims to provide an automated control system for the esterification process in the production process of triacetin, so as to solve the problems proposed in the above background technology that some existing esterification reactors are not convenient for regulating the speed of mixing esterification reaction materials when in use, different mixing speeds are required for the processed materials at different stages of the esterification reaction, and the constant-speed stirring and mixing structure is not conducive to the rapid and uniform mixing of the processed materials.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an automated control system for the esterification process in the production process of triacetin, wherein the esterification material is sequentially added to the interior of the esterification reactor through an esterification feeder, the esterification preheater, the esterification heater and the esterification cooler regulate the temperature of the processed material inside the esterification reactor, and the variable speed mixer stirs and mixes the processed material inside the esterification reactor at a variable speed;

[0007] The automated control system for the esterification process in the production of triacetin includes:

[0008] A driver is fixedly installed on the upper surface of the esterification reactor, and a stirring rod is connected to the lower output end of the driver. A temperature controller is installed on the outside of the esterification reactor, and a temperature control heating wire is connected around the inside of the temperature controller.

[0009] A support frame is fixed to the outer side of the esterification reactor, and a material storage box is mounted on the upper side of the support frame, and the upper side of the material storage box is connected to the transmission pipe through a valve pipe, and the upper side of the transmission pipe is connected to the feed pipe through a transmission pump, and the feed pipe is connected to the upper side of the esterification reactor;

[0010] A waste heat utilization mechanism is provided between the temperature controller, the feed pipe and the stirring rod, and the waste heat of the temperature controller heating the materials inside the esterification reactor is used to preheat the materials fed into the feed pipe and heat the stirring rod, which is located in the middle of the esterification reactor, thereby improving the heating efficiency and uniformity of the esterification reaction materials;

[0011] A speed-limiting stirring mechanism is arranged outside the stirring rod, and the rotation speed of the stirring rod is regulated according to the heating time and temperature to assist the esterification process of triacetin.

[0012] Preferably, three groups of material storage boxes are arranged and distributed in the support frame, and the three groups of material storage boxes add esterification processing materials into the esterification reactor through the valve pipe, the transmission pipe, the transmission pump and the feed pipe.

[0013] Preferably, the waste heat utilization mechanism includes a side guide pipe connected to the side of the temperature controller, and a preheating pipe is installed on the side of the side guide pipe. The top of the temperature controller is connected to the heat-conducting column through an upper guide pipe, and the heat-conducting column is sleeved on the outside of the stirring rod. A heat-conducting groove is opened inside the stirring rod, and a through groove is opened on the upper side of the stirring rod.

[0014] Preferably, the preheating tube is interconnected with the interior of the temperature controller through a side guide tube, and the preheating tube sleeve is installed on the outside of the feed pipe.

[0015] Preferably, four groups of through grooves are opened at equal angles on the sides of the stirring rod, and the heat conduction grooves inside the stirring rod are interconnected with the heat conduction column and the interior of the upper guide tube through the through grooves.

[0016] Preferably, the speed-limiting stirring mechanism includes an electrically driven telescopic rod fixed to the inner side wall of the esterification reactor, and an upper positioning block is fixed to the side telescopic end of the electrically driven telescopic rod, and the side surface of the upper positioning block is connected to the lower positioning block through a control rod, and the lower positioning block is fixedly installed on the outside of the flexible ring, and a speed-limiting ring is fixed to the outside of the stirring rod.

[0017] Preferably, the two ends of the control rod are respectively rotatably connected to the sides of the upper positioning block and the lower positioning block, and the lower positioning block and the flexible ring are driven up and down synchronously, and the flexible ring is sleeved on the outside of the stirring rod to form an up and down sliding structure with it, and the flexible ring is correspondingly arranged directly above the speed limiting ring.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. A feed pipe, a transmission pump, a transmission pipe, a valve pipe and a storage box are connected to the side of the esterification reactor. The storage boxes are arranged in three groups horizontally. Different processing materials are stored in the three groups of storage boxes. The transmission pump is operated to control the materials in different storage boxes to be introduced into the esterification reactor to achieve continuous and autonomous feeding.

[0020] 2. The temperature controller is operated to control the temperature and heat the inside of the esterification reactor. Part of the heated heat is distributed to the outside of the feed pipe through the side guide pipe and the preheating pipe, and the processed materials introduced into the feed pipe are preheated to make full use of the waste heat of the equipment;

[0021] Part of the heat generated by the temperature controller is transmitted to the outside of the stirring rod through the upper guide tube and the heat conduction column. The heat enters the heat conduction groove inside the stirring rod through the through groove. The heat of the stirring rod rises rapidly. The heated stirring rod can quickly heat the processing material while stirring and mixing the processing material, thereby improving the heating efficiency of the processing material.

[0022] 3. The operating driver controls the stirring rod to rotate, and the stirring rod rotates and mixes the processing materials inside the esterification reactor so that the processing materials are evenly distributed.

[0023] The electric drive telescopic rod is operated to push the upper positioning block to move horizontally. At this time, the upper and lower ends of the control rod rotate, and the control rod pushes the lower positioning block and the flexible ring to move downward. The flexible ring is pressed against the side of the speed limiting ring, thereby limiting the rotation speed of the speed limiting ring and the stirring rod. The rotation speed of the stirring rod is regulated so that the processing materials can be mixed at different processing speeds at different times of the esterification process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the control flow of the utility model.

[0025] Figure 2 This is a schematic diagram of the vertical structure of the esterification reactor of the utility model.

[0026] Figure 3 This is a schematic diagram of the elevation structure of the material storage box of the utility model.

[0027] Figure 4 This is a schematic diagram of the elevation structure of the thermostat of the utility model.

[0028] Figure 5It is a schematic diagram of the cross-sectional structure of the heat-conducting column of the utility model.

[0029] Figure 6 This is a schematic diagram of the vertical structure of the through groove of the utility model.

[0030] Figure 7 It is a schematic diagram of the vertical structure of the speed limit ring of the utility model.

[0031] Figure 8 It is a schematic diagram of the flexible circular ring facade structure of the utility model.

[0032] In the figure: 1. esterification reactor; 2. driver; 3. stirring rod; 31. heat conduction groove; 32. through groove; 4. temperature controller; 5. temperature control heating wire; 6. support frame; 7. storage box; 8. valve pipe; 9. transmission pipe; 10. transmission pump; 11. feed pipe; 12. side guide pipe; 13. preheating pipe; 14. upper guide pipe; 15. heat conduction column; 16. electric drive telescopic rod; 17. upper positioning block; 18. control rod; 19. lower positioning block; 20. flexible ring; 21. speed limiting ring. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example 1

[0034] like Figure 1-Figure 3 As shown, the esterification reactor 1 can be loaded with materials autonomously and continuously, and the temperature of the esterification reaction materials can be flexibly regulated, and the operation is convenient. The specific structure is as follows:

[0035] In the esterification process for producing triacetin, esterification materials are sequentially added into the interior of the esterification reactor 1 through an esterification feeder, the esterification preheater, the esterification heater and the esterification cooler regulate the temperature of the processing materials inside the esterification reactor 1, and the variable speed mixer stirs and mixes the processing materials inside the esterification reactor 1 at a variable speed.

[0036] A driver 2 is fixedly installed on the upper surface of the esterification reactor 1, and a stirring rod 3 is connected to the lower output end of the driver 2. A temperature controller 4 is installed on the outside of the esterification reactor 1, and a temperature-controlled heating wire 5 is connected to the inside of the temperature controller 4. A support frame 6 is fixed on the outer side of the esterification reactor 1, and a storage box 7 is embedded and installed on the upper side of the support frame 6, and the upper part of the storage box 7 is connected to the transmission pipe 9 through the valve pipe 8, and the upper part of the transmission pipe 9 is connected to the feed pipe 11 through the transmission pump 10, and the feed pipe 11 is connected to the upper side of the esterification reactor 1.

[0037] Three groups of material storage boxes 7 are arranged and distributed in the support frame 6 , and the three groups of material storage boxes 7 add esterification processing materials into the esterification reactor 1 through the valve pipe 8 , the transmission pipe 9 , the transmission pump 10 and the feed pipe 11 .

[0038] The processing material of triacetin is introduced into three groups of storage boxes 7, the opening state of the valve tube 8 is controlled, and the transmission pump 10 is operated. Under the action of negative pressure, the material in the storage box 7 enters the esterification reactor 1 through the transmission tube 9 and the feed tube 11. According to the production needs of the esterification reaction material, the temperature controller 4 and the temperature control heating wire 5 are operated to heat the material inside the esterification reactor 1 (the temperature controller 4 can realize the preheating, heating and cooling of the esterification reaction. When the temperature controller 4 is in the stopped state, the processing material inside the esterification reactor 1 is naturally cooled) to assist the esterification process. Example 2

[0039] like Figure 2 , Figure 4-Figure 6 As shown, a waste heat utilization mechanism is provided outside the esterification reactor 1 to improve the heating efficiency of the processed materials. The specific structure is as follows:

[0040] A waste heat utilization mechanism is provided between the temperature controller 4 and the feed pipe 11 and the stirring rod 3. The waste heat of the temperature controller 4 used to heat the internal materials of the esterification reactor 1 is used to preheat the materials fed into the feed pipe 11 and to heat the stirring rod 3. The stirring rod 3 is located in the middle position inside the esterification reactor 1, thereby improving the heating efficiency and uniformity of the esterification reaction materials.

[0041] The waste heat utilization mechanism includes a side flow guide pipe 12 connected to the side of the temperature controller 4, and a preheating pipe 13 is installed on the side of the side flow guide pipe 12. The top of the temperature controller 4 is connected to the heat-conducting column 15 through the upper flow guide pipe 14, and the heat-conducting column 15 is sleeved on the outside of the stirring rod 3. The stirring rod 3 is provided with a heat-conducting groove 31, and the upper side of the stirring rod 3 is provided with a through groove 32; the preheating pipe 13 is mutually connected with the inside of the temperature controller 4 through the side flow guide pipe 12, and the preheating pipe 13 is sleeved and installed on the outside of the feed pipe 11; four groups of through grooves 32 are opened at equal angles on the side of the stirring rod 3, and the heat-conducting groove 31 inside the stirring rod 3 is mutually connected with the heat-conducting column 15 and the inside of the upper flow guide pipe 14 through the through groove 32.

[0042] Part of the heat generated by the temperature controller 4 enters the interior of the preheating tube 13 through the side guide tube 12. The preheating tube 13 is installed on the outside of the feed tube 11. The heat inside the preheating tube 13 preheats the processing material transmitted inside the feed tube 11, so that the processing material can be quickly heated to the corresponding temperature after entering the esterification reactor 1.

[0043] Part of the heat generated by the temperature controller 4 enters the interior of the heat-conducting column 15 through the upper guide tube 14, and the heat in the heat-conducting column 15 enters the heat-conducting groove 31 opened in the stirring rod 3 through the through groove 32. The heat filled in the stirring rod 3 can quickly heat it. After the stirring rod 3 is heated, it can heat the processing material inside the esterification reactor 1, thereby improving the heating efficiency of the processing material. Example 3

[0044] like Figure 7-Figure 8 As shown, a limited speed stirring mechanism is provided in the esterification reactor 1 to adjust the material mixing speed according to the time period of the esterification process. The specific structure is as follows:

[0045] A limited speed stirring mechanism is arranged outside the stirring rod 3, and the speed of the stirring rod 3 is regulated according to the heating time and temperature to assist the esterification process of triacetin;

[0046] The speed-limiting stirring mechanism includes an electrically driven telescopic rod 16 fixed to the inner wall of the esterification reactor 1, and an upper positioning block 17 is fixed to the side telescopic end of the electrically driven telescopic rod 16, and the side of the upper positioning block 17 is connected to the lower positioning block 19 through a control rod 18, and the lower positioning block 19 is fixedly installed on the outside of the flexible ring 20, and the outside of the stirring rod 3 is fixed with a speed-limiting ring 21; the two ends of the control rod 18 are respectively rotatably connected to the sides of the upper positioning block 17 and the lower positioning block 19, and the lower positioning block 19 is synchronously driven up and down with the flexible ring 20, and the flexible ring 20 is sleeved on the outside of the stirring rod 3 to form an up and down sliding structure with it, and the flexible ring 20 is correspondingly arranged directly above the speed-limiting ring 21.

[0047] According to the time and temperature changes of the esterification reaction of the processing material, the rotation and mixing speed of the stirring rod 3 is adjusted, and the electric drive telescopic rod 16 is operated to push the upper positioning block 17 to move horizontally. The two ends of the control rod 18 connected between the upper positioning block 17 and the lower positioning block 19 rotate, and the control rod 18 pushes the lower positioning block 19 and the flexible ring 20 to move up and down. The flexible ring 20 moves longitudinally and is pressed on the speed limiting ring 21. According to the change of the pressing force of the flexible ring 20, the speed of the speed limiting ring 21 and the stirring rod 3 is adjusted to control the speed of the stirring rod 3 to rotate and mix the processing materials, so as to assist in the production of triacetin processing materials at different time periods.

[0048] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An automated control system for an esterification process in a triacetin production process, wherein an esterification feeder is used to sequentially add esterification materials into an esterification reactor (1), an esterification preheater, an esterification heater and an esterification cooler are used to control the temperature of the processing materials in the esterification reactor (1), and a variable speed mixer is used to variable speed stir and mix the processing materials in the esterification reactor (1); It is characterized in that include: A driver (2) is fixedly mounted on the upper surface of the esterification reactor (1), and a stirring rod (3) is connected to the lower output end of the driver (2); a temperature controller (4) is mounted on the outside of the esterification reactor (1), and a temperature control heating wire (5) is connected to the inside of the temperature controller (4); A support frame (6) is fixed to the outer side of the esterification reactor (1), and a material storage box (7) is mounted on the upper side of the support frame (6), and the upper side of the material storage box (7) is connected to a transmission pipe (9) through a valve pipe (8), and the upper side of the transmission pipe (9) is connected to a feed pipe (11) through a transmission pump (10), and the feed pipe (11) is connected to the upper side of the esterification reactor (1); A waste heat utilization mechanism is provided between the temperature controller (4), the feed pipe (11) and the stirring rod (3), and the waste heat from the temperature controller (4) heating the material inside the esterification reactor (1) is used to preheat the material fed into the feed pipe (11) and to heat the stirring rod (3), wherein the stirring rod (3) is located in the middle of the esterification reactor (1), thereby improving the heating efficiency and uniformity of the esterification reaction material; A speed-limiting stirring mechanism is disposed outside the stirring rod (3), and the rotation speed of the stirring rod (3) is regulated according to the heating time and temperature to assist the esterification process of triacetin.

2. The automatic control system for esterification process in the production process of triacetin according to claim 1, characterized in that: Three groups of material storage boxes (7) are arranged and distributed in the support frame (6), and the three groups of material storage boxes (7) add esterification processing materials into the esterification reactor (1) through the valve pipe (8), the transmission pipe (9), the transmission pump (10) and the feed pipe (11).

3. The automatic control system for esterification process in the production process of triacetin according to claim 1, characterized in that: The waste heat utilization mechanism comprises a side flow guide pipe (12) connected to the side of the temperature controller (4), and a preheating pipe (13) is installed on the side of the side flow guide pipe (12). The upper part of the temperature controller (4) is connected to a heat-conducting column (15) through an upper flow guide pipe (14), and the heat-conducting column (15) is sleeved on the outside of the stirring rod (3). The stirring rod (3) is provided with a heat-conducting groove (31) inside, and a through groove (32) is provided on the upper side of the stirring rod (3).

4. The automatic control system for the esterification process in the production process of triacetin according to claim 3, characterized in that: The preheating pipe (13) is interconnected with the interior of the temperature controller (4) through the side flow guide pipe (12), and the preheating pipe (13) is sleeved and installed on the outside of the feed pipe (11).

5. The automatic control system for esterification process in the production process of triacetin according to claim 3, characterized in that: Four groups of through grooves (32) are provided at equal angles on the sides of the stirring rod (3), and the heat conduction groove (31) inside the stirring rod (3) is interconnected with the heat conduction column (15) and the interior of the upper flow guide tube (14) through the through grooves (32).

6. The automatic control system for esterification process in the production process of triacetin according to claim 1, characterized in that: The speed-limiting stirring mechanism comprises an electrically driven telescopic rod (16) fixed to the inner wall of the esterification reactor (1), an upper positioning block (17) being fixed to the telescopic end of the side of the electrically driven telescopic rod (16), and a side surface of the upper positioning block (17) being connected to a lower positioning block (19) via a position control rod (18), and the lower positioning block (19) being fixedly mounted on the outside of a flexible circular ring (20), and a speed-limiting ring (21) being fixed to the outside of the stirring rod (3).

7. The automated control system for the esterification process in the production of triacetin according to claim 6, characterized in that: The two ends of the control rod (18) are rotatably connected to the sides of the upper positioning block (17) and the lower positioning block (19), respectively, and the lower positioning block (19) and the flexible ring (20) are synchronously driven up and down, and the flexible ring (20) is sleeved on the outside of the stirring rod (3) to form an up and down sliding structure therewith, and the flexible ring (20) is correspondingly arranged at a position directly above the speed limiting ring (21).

Images