Continuous rectification and recovery device for dipropylene glycol

Abstract

The utility model relates to the technical field of dipropylene glycol, and discloses a dipropylene glycol continuous rectification recovery device which comprises a recovery device and a tower bottom tower kettle, a heater is arranged in the tower bottom tower kettle, a rectification tower is inserted into the top of the tower bottom tower kettle, the bottom of the rectification tower is in threaded connection with a connecting pipeline, and the tower bottom tower kettle is arranged at the bottom of the recovery device. The recovery device comprises a storage assembly, a condenser is installed on the surface of the top end of the storage assembly, a PID controller is installed on the surface of the top end of the storage assembly, and an air outlet cover plate is installed at the bottom of the condenser. According to the dipropylene glycol continuous rectification and recovery device, by arranging the rectifying towers, the connecting pipeline, the tower bottom and the heater, the two rectifying towers can rectify and purify a crude product solution, so that propylene glycol and dipropylene glycol can be obtained more simply, conveniently and efficiently, and meanwhile, the purity of propylene glycol and dipropylene glycol rectified and separated from a crude product can be controlled; therefore, the service time of the device can be prolonged.

Description

Technical Field

[0001] This utility model relates to the field of dipropylene glycol technology, specifically to a continuous dipropylene glycol distillation and recovery device. Background Technology

[0002] Dipropylene glycol (DPG), also known as dipropylene glycol condensate, has excellent solubility, good stability, and mild and low irritation, so it is widely used in cosmetics, industrial cleaning, pharmaceuticals and other fields. In industrial production, dipropylene glycol can be obtained as a byproduct of the hydration of 1,2-epoxypropane to propylene glycol, or by the reaction of propylene oxide and propylene glycol in the presence of dilute sulfuric acid.

[0003] This dipropylene glycol contains propylene glycol and tripropylene glycol as a byproduct, and the boiling points of the three are very similar, making separation and purification difficult. In recent years, the quality requirements for dipropylene glycol have shown a trend of "high-end, refined and environmentally friendly". The control of purity and impurities has become the core competitive indicator. Therefore, it is very necessary to propose an efficient distillation and purification device. Utility Model Content

[0004] The purpose of this invention is to provide a continuous distillation and recovery device for dipropylene glycol to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dipropylene glycol continuous distillation recovery device, comprising a recovery device and a bottom reboiler, wherein a heater is installed inside the bottom reboiler, a distillation column is inserted into the top of the bottom reboiler, a connecting pipe is threaded to the bottom of the distillation column, and the bottom reboiler is installed at the bottom of the recovery device.

[0006] The recycling device includes a collection component, a condenser is mounted on the top surface of the collection component, a PID controller is mounted on the top surface of the collection component, and an exhaust cover is mounted on the bottom of the condenser.

[0007] The storage component includes a support unit and a storage unit, which are arranged sequentially from the outside to the inside.

[0008] The support unit includes a support frame, a connecting wall is installed in the middle of the top of the support frame, a limiting threaded rod is inserted into the top of the connecting wall, a limiting frame is movably connected to the surface of the limiting threaded rod, a metal lug is fixedly connected to the surface of the limiting frame, and an insert threaded rod is fixedly connected to the bottom surface of the metal lug.

[0009] Preferably, the storage unit includes a storage tank, the top of which is threadedly connected to a sealing cover, and the inner wall surface of the sealing cover is slidably connected to a storage pipe.

[0010] Preferably, the storage container is installed at the top center of the support frame. There are two storage containers, which are distributed left and right. The storage container on the left can hold propylene glycol, and the storage container on the right can hold dipropylene glycol.

[0011] Preferably, the vent cover is threaded to the top surface of the distillation column.

[0012] Preferably, the top surface of the PID controller is fixedly connected to two pipes. The pipe on the outer side is threaded to the top of the distillation column, and the pipe on the inner side is connected to the top surface of the receiving pipe. The PID controller can separate and collect propylene glycol and dipropylene glycol.

[0013] Preferably, the limiting frame is movably connected to the surface of the storage tank and the top of the connecting wall. The limiting frame and the connecting wall can clamp and fix the storage tank, making it convenient to disassemble and replace the storage tank.

[0014] Preferably, the threaded rod is inserted into the middle position of the air outlet cover plate, the threaded rod is inserted into the air outlet cover plate, the bottom of the threaded rod is threaded with a nut, and the threaded rod can determine the position of the limiting frame.

[0015] Preferably, the limiting threaded rod is inserted into the inward end of the limiting frame, and the limiting threaded rod is inserted into the connection between the limiting frame and the connecting wall, thereby determining the position of the limiting frame, facilitating the disassembly and replacement of the limiting frame, and making the disassembly of the limiting frame faster and more convenient.

[0016] Preferably, there are two distillation columns, which are arranged side by side. The left distillation column can distill propylene glycol, and the right distillation column can distill dipropylene glycol.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] This continuous distillation and recovery device for dipropylene glycol includes a distillation column, connecting pipelines, a bottom column, and a heater. The two distillation columns can purify the crude product solution by distillation, making the extraction of propylene glycol and dipropylene glycol simpler, more convenient, and more efficient. At the same time, the purity of the propylene glycol and dipropylene glycol separated from the crude product can be controlled, thereby increasing the service life of the device.

[0019] This dipropylene glycol continuous distillation and recovery device includes a receiving tank, a limiting frame, metal lugs, and a threaded rod. The limiting frame is connected to the threaded rod via the metal lugs, allowing the limiting frame and the threaded rod to control the receiving tank and protect the receiving tank inside the limiting frame. Attached Figure Description

[0020] Figure 1 This is a three-dimensional schematic diagram of the entire utility model;

[0021] Figure 2 This is a three-dimensional schematic diagram of the recovery device, distillation column, connecting pipes, and bottom of the column of this utility model;

[0022] Figure 3 This utility model Figure 2 A magnified view of the structure at point A in the diagram;

[0023] Figure 4 This is a three-dimensional schematic diagram of the recycling device of this utility model;

[0024] Figure 5 This utility model Figure 4 A magnified view of the structure at point B in the diagram.

[0025] In the diagram: 1. Recovery device; 11. Gas outlet cover; 12. Condenser; 13. Collection assembly; 131. Support frame; 132. Limiting frame; 133. Insert threaded rod; 134. Limiting threaded rod; 135. Connecting wall; 136. Collection tank; 137. Metal lug; 138. Sealing cover; 139. Collection pipe; 14. PID controller; 2. Distillation column; 3. Connecting pipe; 4. Bottom of column; 5. Heater. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Please see Figure 1-5 The present invention provides the following technical solution:

[0028] A continuous dipropylene glycol distillation recovery device includes a recovery device 1 and a bottom column 4. A heater 5 is installed inside the bottom column 4. A distillation column 2 is inserted into the top of the bottom column 4. A connecting pipe 3 is threaded to the bottom of the distillation column 2. There are two distillation columns 2, which are arranged side by side. The left distillation column 2 can distill propylene glycol, and the right distillation column 2 can distill dipropylene glycol. The bottom column 4 is installed at the bottom of the recovery device 1.

[0029] The recovery device 1 includes a collection component 13, a condenser 12 is installed on the top surface of the collection component 13, a PID controller 14 is installed on the top surface of the collection component 13, and an exhaust cover 11 is installed at the bottom of the condenser 12. The exhaust cover 11 is threadedly connected to the top surface of the distillation column 2.

[0030] The storage component 13 includes a support unit and a storage unit, which are arranged from the outside to the inside.

[0031] The support unit includes a support frame 131. A connecting wall 135 is installed in the middle of the top of the support frame 131. A limiting threaded rod 134 is inserted into the top of the connecting wall 135. A limiting frame 132 is movably connected to the surface of the limiting threaded rod 134. The limiting threaded rod 134 is inserted into the inward end of the limiting frame 132. The limiting threaded rod 134 is inserted into the connection between the limiting frame 132 and the connecting wall 135, thereby determining the position of the limiting frame 132 and facilitating the installation of the limiting frame. The frame 132 can be disassembled and replaced, making the disassembly of the limiting frame 132 faster and more convenient. The surface of the limiting frame 132 is fixedly connected with a metal ear 137, and the bottom surface of the metal ear 137 is fixedly connected with a threaded rod 133. The threaded rod 133 is inserted into the middle position of the air outlet cover 11. The threaded rod 133 is inserted into the air inlet and outlet cover 11. The bottom of the threaded rod 133 is threaded with a nut, and the threaded rod 133 can determine the position of the limiting frame 132.

[0032] The storage unit includes two storage tanks 136, which are mounted at the top center of the support frame 131. The two storage tanks 136 are arranged side-by-side. The left storage tank 136 can hold propylene glycol, and the right storage tank 136 can hold dipropylene glycol. A sealing cover 138 is threaded onto the top of each storage tank 136. A limiting frame 132 is movably connected to the surface of each storage tank 136 and is movably connected to a connecting... The top of the connecting wall 135, the limiting frame 132 and the connecting wall 135 can clamp and fix the storage tank 136, making it easy to disassemble and replace the storage tank 136. The inner wall surface of the sealing cover 138 is slidably connected to the storage pipe 139. The top surface of the PID controller 14 is fixedly connected to two pipes. The pipe on the outward side is threaded to the top of the distillation column 2, and the pipe on the inward side is connected to the top surface of the storage pipe 139. The PID controller 14 can separate and collect propylene glycol and dipropylene glycol.

[0033] When in use, the bolt is turned, and the bolt is disengaged from the connection between the receiving pipe 139 and the PID controller 14. The receiving pipe 139 moves downward along the inner wall surface of the sealing cover plate 138, so that the receiving pipe 139 is disengaged from the PID controller 14.

[0034] Rotate the nut to disengage it from the threaded rod 133, and the connection between the threaded rod 133 and the support frame 131 becomes loose.

[0035] Rotate the surface nut of the limiting threaded rod 134 to loosen the connection between the limiting threaded rod 134, the limiting frame 132 and the connecting wall 135, and pull the limiting threaded rod 134 forward to disengage the limiting threaded rod 134 from the limiting frame 132 and the connecting wall 135.

[0036] Pull the limiting frame 132 upward, and the limiting frame 132 drives the threaded rod 133 upward through the metal lug 137, so that the threaded rod 133 is disengaged from the support frame 131. Then pull the limiting frame 132 outward, so that the limiting frame 132 is disengaged from the storage tank 136.

[0037] Pull the storage tank 136 outward to move it away from the support frame 131, so that the storage tank 136 can be replaced, and the storage tanks 136 on the left and right sides can collect propylene glycol and dipropylene glycol.

[0038] After purging the experimental apparatus with nitrogen, crude dipropylene glycol is added to the left distillation column 2. The crude product is the reaction solution of propylene oxide and propylene glycol to synthesize dipropylene glycol. The pressure is adjusted to -98 kPa and heating is started. When the kettle temperature is 100-120℃ and the top temperature is 70-90℃, propylene glycol is collected from the top. In order to obtain a high evaporation rate, crude dipropylene glycol is added again after the collection is completed.

[0039] Transfer the left distillation column 2 to the right distillation column 2. After the right distillation column 2 obtains a sufficient amount of crude product, increase the temperature of the heater 5 to 160-180℃ and continue distillation to collect dipropylene glycol. Continuously establish equilibrium in the column to achieve the purification effect. Adjust the reflux ratio appropriately and monitor the sample content regularly.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A continuous distillation recovery apparatus for dipropylene glycol, comprising a recovery unit (1) and a bottom column (4), characterized in that: A heater (5) is installed inside the bottom of the column (4), a distillation column (2) is inserted into the top of the bottom of the column (4), a connecting pipe (3) is threaded to the bottom of the distillation column (2), and the bottom of the column (4) is installed at the bottom of the recovery device (1). The recycling device (1) includes a receiving component (13), a condenser (12) is installed on the top surface of the receiving component (13), a PID controller (14) is installed on the top surface of the receiving component (13), and an exhaust cover (11) is installed at the bottom of the condenser (12). The storage component (13) includes a support unit and a storage unit, which are arranged sequentially from the outside to the inside; The support unit includes a support frame (131), a connecting wall (135) is installed in the middle of the top of the support frame (131), a limiting threaded rod (134) is inserted into the top of the connecting wall (135), a limiting frame (132) is movably connected to the surface of the limiting threaded rod (134), a metal ear (137) is fixedly connected to the surface of the limiting frame (132), and an insert threaded rod (133) is fixedly connected to the bottom surface of the metal ear (137).

2. The dipropylene glycol continuous distillation and recovery apparatus according to claim 1, characterized in that: The storage unit includes a storage tank (136), the top of which is threadedly connected to a sealing cover (138), and the inner wall surface of the sealing cover (138) is slidably connected to a storage pipe (139).

3. The dipropylene glycol continuous distillation and recovery apparatus according to claim 2, characterized in that: The storage tank (136) is installed at the top center of the support frame (131). There are two storage tanks (136), which are distributed left and right.

4. The dipropylene glycol continuous distillation and recovery apparatus according to claim 3, characterized in that: The vent cover (11) is threaded to the top surface of the distillation column (2).

5. The dipropylene glycol continuous distillation and recovery apparatus according to claim 4, characterized in that: Two pipes are fixedly connected to the top surface of the PID controller (14).

6. The dipropylene glycol continuous distillation and recovery apparatus according to claim 5, characterized in that: The limiting frame (132) is movably connected to the surface of the storage tank (136) and the limiting frame (132) is movably connected to the top of the connecting wall (135).

7. The dipropylene glycol continuous distillation and recovery apparatus according to claim 6, characterized in that: The threaded rod (133) is inserted into the middle position of the vent cover (11).

8. The dipropylene glycol continuous distillation and recovery apparatus according to claim 7, characterized in that: The limiting threaded rod (134) is inserted into the inward end of the limiting frame (132).

9. A continuous dipropylene glycol distillation and recovery apparatus according to claim 8, characterized in that: The number of distillation columns (2) is two, and the two distillation columns (2) are distributed on the left and right sides.

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