Triethylamine water removal apparatus

Abstract

The application relates to the technical field of triethylamine production equipment, and discloses a triethylamine water removal device, which comprises a buffer tank and a drying tank, the drying tank is filled with drying filler, the buffer tank comprises a straight cylinder section and a conical section arranged at the lower end of the straight cylinder section, the diameter of the conical section gradually decreases in the direction away from the straight cylinder section, a feeding pipeline is arranged between the buffer tank and the conical section, the outlet of the feeding pipeline extends along the tangent direction of the conical section, a conveying pump is arranged on the feeding pipeline, a discharge port is arranged at the upper end of the straight cylinder section, a loop pipeline is arranged between the discharge port and the buffer tank, a filter cylinder is detachably arranged on the discharge port, and a blowdown port is arranged at the end of the conical section away from the straight cylinder section. The application can improve the water removal effect of triethylamine.

Description

Technical Field

[0001] This application relates to the technical field of triethylamine production equipment, and in particular to a triethylamine dehydration device. Background Technology

[0002] Triethylamine is an important chemical raw material, widely used in the preparation of pesticides and pharmaceutical intermediates such as glyphosate, ethyl difluoroacetate, and 5-nonylsalicylaldehyde, generating triethylamine salt as a byproduct. Due to its high price and toxicity, triethylamine is usually recovered from the triethylamine salt byproduct.

[0003] The industrial process of recovering triethylamine from triethylamine salts mainly consists of four steps:

[0004] 1. Neutralize the wastewater containing triethylamine salts with an alkaline solution of approximately 40% concentration;

[0005] 2. Distill the above wastewater to recover triethylamine. At this time, the triethylamine has a high water content, which can reach 10%-20%.

[0006] 3. Dry the above-mentioned aqueous triethylamine with solid sodium hydroxide in a phase separation tank to separate the triethylamine and water into layers. Then remove most of the water from the above-mentioned triethylamine. At this time, the water content in the triethylamine is between 2% and 6%.

[0007] 4. After phase separation, the triethylamine is distilled to remove water and obtain qualified triethylamine.

[0008] Generally, the required water content of qualified triethylamine applied to the main process is below 0.2%. However, since triethylamine and water form an azeotrope, in step 4 above, it is difficult to completely separate the two components in the triethylamine-water azeotrope using ordinary distillation, often resulting in the triethylamine having an unacceptable water content. Therefore, there is still room for improvement in the dehydration of triethylamine. Utility Model Content

[0009] To better remove moisture from triethylamine, this application provides a triethylamine dehydration device.

[0010] The technical solution adopted in this application is as follows:

[0011] A triethylamine dehydration device includes a buffer tank and a drying tank. The drying tank is filled with drying packing material. The buffer tank includes a straight cylindrical section and a conical section located at the lower end of the straight cylindrical section. The diameter of the conical section gradually decreases in the direction away from the straight cylindrical section. A feed pipe is provided between the buffer tank and the conical section. The outlet of the feed pipe extends along the tangent direction of the conical section, and a conveying pump is provided on the feed pipe. A discharge port is provided at the upper end of the straight cylindrical section, and a return pipe is provided between the discharge port and the buffer tank. A filter cartridge is detachably installed at the discharge port. A drain outlet is provided at the end of the conical section away from the straight cylindrical section.

[0012] By adopting the above technical solution, triethylamine enters the drying tank tangentially from the conical section. The triethylamine rises spirally within the drying tank, thus fully mixing with the drying packing material to remove moisture. The drying packing material can be selected from caustic soda flakes, which provides even better water removal. Then, the triethylamine is discharged from the outlet into a buffer tank, and this cycle of water removal is repeated, greatly improving the water removal efficiency of the triethylamine.

[0013] Optionally, the end of the straight section away from the conical section may be detachably provided with a head, and the head may be provided with a pressure measuring element.

[0014] By adopting the above technical solution and setting a head on the straight section, it is convenient to fill and replace the drying packing in the drying tank.

[0015] Optionally, the side wall of the straight section is provided with an overflow pipe, and the drain outlet is connected to an air blowing pipe.

[0016] By adopting the above technical solution, when the drain outlet is blocked, it can be cleared by sweeping inert gas, and the air in the drying tank can also be removed by sweeping inert gas.

[0017] Optionally, the inner wall of the straight section is provided with a connecting cylinder corresponding to the discharge port, the filter cylinder is sleeved on the side wall of the connecting cylinder, and the side wall of the filter cylinder is provided with a limiting member, which is used to restrict the filter cylinder from sliding on the side wall of the connecting cylinder.

[0018] By adopting the above technical solution, the filter cartridge can be detachably connected to the connecting cylinder through the limiting component, which facilitates the installation, disassembly, and cleaning of the filter cartridge.

[0019] Optionally, the limiting member includes a limiting rod that passes through the side wall of the filter cylinder and is threaded to the side wall of the connecting cylinder. The end of the limiting rod has an abutment block, and the abutment block abuts against the side wall of the filter cylinder.

[0020] By adopting the above technical solution, the limiting rod passes through the filter cylinder and is threaded to the connecting cylinder, and the abutment block is pressed against the side wall of the filter cylinder, thereby positioning the filter cylinder.

[0021] Optionally, the outer wall of the connecting cylinder is provided with a reinforcing member. When the abutting block is pressed against the side wall of the filter cylinder, the reinforcing member and the limiting rod cooperate to restrict the rotation of the limiting rod.

[0022] By adopting the above technical solution, the movement of the limiting rod is limited by the cooperation of the reinforcement and the limiting rod, thereby improving the stability of the limiting rod and thus improving the stability of the filter cartridge.

[0023] Optionally, the side wall of the limiting rod is provided with an annular groove, and the end of the filter cylinder near the connecting ring is provided with a slot. When the abutting block is pressed against the side wall of the filter cylinder, the slot and the annular groove correspond to each other. The reinforcing member includes a connecting ring sleeved on the outer wall of the connecting cylinder and a plug rod is provided on the connecting ring. The plug rod can be inserted into the annular groove, and the side wall of the connecting cylinder is provided with an elastic element for driving the plug rod to be inserted into the annular groove.

[0024] By adopting the above technical solution, under the action of the elastic element, the driving rod is inserted into the annular groove, thereby limiting the movement of the limiting rod and improving the stability of the limiting rod.

[0025] Optionally, the elastic element includes a spring sleeved on the side wall of the connecting cylinder, one end of the spring being connected to the inner wall of the straight cylinder section, and the other end being connected to the connecting ring.

[0026] By adopting the above technical solution, the spring can provide the force for the insertion rod to be inserted into the annular groove, and when it is necessary to remove the limiting rod, the spring can be squeezed to make the insertion rod disengage from the annular groove.

[0027] In summary, this application includes at least one of the following beneficial effects:

[0028] 1. Triethylamine enters the conical section tangentially, thus rising in a spiral shape within the drying tank. The drying packing material, located within the drying tank, can fully mix and react with the triethylamine, and adsorb the moisture in the triethylamine, thereby improving the dehydration efficiency.

[0029] 2. The filter cartridge can be detachably installed in the drying tank, making it easy to replace and maintain. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of an embodiment of this application;

[0031] Figure 2 This is a schematic diagram of the drying tank in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the filter cylinder in an embodiment of this application;

[0033] Figure 4 This is an exploded view of the filter cartridge in an embodiment of this application.

[0034] Explanation of reference numerals in the attached drawings: 1. Buffer tank; 2. Drying tank; 21. Straight cylindrical section; 22. Conical section; 3. Feed pipe; 4. Conveyor pump; 5. Discharge port; 6. Return pipe; 7. Filter cartridge; 8. Drain outlet; 9. End cap; 10. Pressure measuring element; 11. Air blowing pipe; 12. Connecting cylinder; 13. Limiting element; 131. Limiting rod; 132. Abutment block; 14. Reinforcing element; 141. Connecting ring; 142. Insert rod; 15. Ring groove; 16. Slot; 17. Elastic element; 18. Overflow pipe. Detailed Implementation

[0035] The present application will be further described in detail below with reference to the accompanying drawings.

[0036] This application discloses a triethylamine dehydration device. (Refer to...) Figure 1 and Figure 2 The dehydration device includes a buffer tank 1 and a drying tank 2, with triethylamine stored in the buffer tank 1. The drying tank 2 is filled with drying packing material, which is used to adsorb moisture from the triethylamine. Preferably, in this embodiment, the drying packing material is selected from caustic soda flakes, and the filling height of the caustic soda flakes is close to 1 / 2 of the height of the drying tank 2.

[0037] The drying tank 2 includes a cylindrical section 21 and a conical section 22 located at the lower end of the cylindrical section 21. The diameter of the conical section 22 gradually decreases away from the cylindrical section 21. A feed pipe 3 connects the buffer tank 1 and the conical section 22, and the feed pipe 3 extends tangentially along the conical section 22. A transfer pump 4 is installed on the feed pipe 3. Triethylamine in the buffer tank 1 is pumped into the conical section 22 by the transfer pump 4, and flows spirally upward in the drying tank 2, thereby fully mixing with the drying packing material in the drying tank 2, allowing the drying packing material to better adsorb the moisture in the triethylamine.

[0038] The upper end of the cylindrical section 21 is provided with a discharge port 5, and a loop pipe 6 is connected to the discharge port 5 of the cylindrical section 21. The other end of the loop pipe 6 is connected to the buffer tank 1. A filter cartridge 7 is installed in the inner wall of the cylindrical section 21. The filter cartridge 7 is used to intercept the drying packing in the drying tank 2 and prevent the drying packing from flowing into the buffer tank 1. The triethylamine in the buffer tank 1 enters the drying tank 2 to remove water, and then flows back to the buffer tank 1 from the discharge port 5. This cycle continuously reduces the water content in the triethylamine, resulting in high processing efficiency.

[0039] Furthermore, a drain port 8 is installed at the lower end of the conical section 22. When the drying packing needs to be replaced, the drain port 8 can be opened to remove the drying packing from the drying tank 2. A head 9 is detachably installed at the upper end of the straight section 21 via bolts or other means. A pressure measuring device 10 is installed on the head 9. The pressure measuring device 10 is an existing pressure testing device that can clearly show the pressure in the drying tank 2. When filling with new drying packing, the head 9 is removed for easy addition.

[0040] A blower pipe 11 is connected to the drain outlet 8. An overflow pipe 18 is installed on the side wall of the straight section 21, and the overflow pipe 18 is positioned lower than the discharge outlet 5. When the drain outlet 8 becomes blocked during unloading, gas is blown into the drying tank 2 through the blower pipe 11. The other pipes are closed, so the gas delivered through the blower pipe 11 can clear the drain outlet 8, and the gas is discharged from the overflow pipe 18. The blower pipe 11 is connected to an inert gas source, such as nitrogen. After the drying packing is added to the drying tank 2, gas is blown into it through the blower pipe 11, which can also be used to replace the air in the drying tank 2. In this embodiment, all pipes are equipped with corresponding valves to control the opening and closing of the pipes, which will not be described in detail here.

[0041] Reference Figure 3 and Figure 4 A connecting cylinder 12 is installed on the inner wall of the straight section 21, corresponding to the discharge port 5. The filter cylinder 7 is installed on the connecting cylinder 12. The filter screen on the filter cylinder 7 is fixed by bolts or other means. The filter cylinder 7 is sleeved on the outer wall of the connecting cylinder 12, and a limiting member 13 is installed on the side wall of the filter cylinder 7. The limiting member 13 is used to position the filter cylinder 7.

[0042] The limiting member 13 includes a limiting rod 131 that passes through the side wall of the filter cylinder 7, and one end of the limiting rod 131 is threaded to the side wall of the connecting cylinder 12. An abutment block 132 is fixed to the end of the limiting rod 131, and the abutment block 132 can abut against the side wall of the filter cylinder 7, thereby positioning the filter cylinder 7.

[0043] In a further embodiment, in order to prevent the limiting rod 131 from moving and loosening, a reinforcing member 14 is installed on the outer wall of the connecting cylinder 12. The reinforcing member 14 cooperates with the limiting rod 131 to position the limiting rod 131.

[0044] The side wall of the limiting rod 131 has an annular groove 15, and the end of the filter cylinder 7 has a slot 16. When the abutment block 132 is pressed against the surface of the filter cylinder 7, the annular groove 15 and the slot 16 correspond to each other. The reinforcing member 14 includes a connecting ring 141 sleeved on the outer wall of the connecting cylinder 12. A rod 142 is provided on the side of the connecting ring 141 facing the filter cylinder 7, and the rod 142 can be inserted into the slot 16. An elastic member 17 is provided on the outer wall of the connecting cylinder 12. The elastic member 17 is used to provide the force for the rod 142 to be inserted into the slot 16 and abut against the annular groove 15. A guide block and guide groove structure can be provided between the connecting ring 141 and the connecting cylinder 12 to limit the rotation of the connecting ring 141.

[0045] The elastic element 17 is a spring, with one end connected to the inner wall of the straight section 21 and the other end connected to the connecting ring 141. When the filter cartridge 7 is installed on the connecting cylinder 12, the spring is in a compressed state, thereby driving the insertion rod 142 to press against the annular groove 15, thus restricting the movement of the limiting rod 131.

[0046] The implementation principle of the triethylamine dehydration device in this application embodiment is as follows: Drying packing (caustic soda flakes) is added to the drying tank 2, and triethylamine is sent into the conical section 22 by the transfer pump 4. The triethylamine spirals upward in the drying tank 2 and mixes thoroughly with the caustic soda flakes, so that the caustic soda flakes can better adsorb the moisture in the triethylamine. The triethylamine flows back to the buffer tank 1 from the discharge port 5, and the cycle repeats, thereby gradually reducing the water content in the triethylamine. Compared with other existing technologies, it has the advantages of high processing efficiency and short processing time.

[0047] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A triethylamine dehydration device, characterized in that: The system includes a buffer tank (1) and a drying tank (2). The drying tank (2) is filled with drying filler. The buffer tank (1) includes a straight section (21) and a conical section (22) located at the lower end of the straight section (21). The diameter of the conical section (22) gradually decreases in the direction away from the straight section (21). A feed pipe (3) is provided between the buffer tank (1) and the conical section (22). The outlet of the feed pipe (3) extends along the tangent direction of the conical section (22). A conveying pump (4) is provided on the feed pipe (3). A discharge port (5) is provided at the upper end of the straight section (21). A loop pipe (6) is provided between the discharge port (5) and the buffer tank (1). A filter cartridge (7) is detachably provided on the discharge port (5). A drain port (8) is provided at the end of the conical section (22) away from the straight section (21).

2. The triethylamine dehydration device according to claim 1, characterized in that: The straight section (21) is detachably provided with a head (9) at the end away from the conical section (22), and a pressure measuring element (10) is provided on the head (9).

3. The triethylamine dehydration device according to claim 2, characterized in that: An overflow pipe (18) is provided on the side wall of the straight section (21), and an air blowing pipe (11) is connected to the drain outlet (8).

4. The triethylamine dehydration device according to claim 3, characterized in that: The inner wall of the straight section (21) is provided with a connecting cylinder (12) corresponding to the discharge port (5). The filter cylinder (7) is sleeved on the side wall of the connecting cylinder (12). The side wall of the filter cylinder (7) is provided with a limiting member (13). The limiting member (13) is used to restrict the filter cylinder (7) from sliding on the side wall of the connecting cylinder (12).

5. The triethylamine dehydration device according to claim 4, characterized in that: The limiting member (13) includes a limiting rod (131) that passes through the side wall of the filter cylinder (7), and the limiting rod (131) is threaded to the side wall of the connecting cylinder (12). The end of the limiting rod (131) has an abutment block (132), and the abutment block (132) abuts against the side wall of the filter cylinder (7).

6. The triethylamine dehydration device according to claim 5, characterized in that: The outer wall of the connecting cylinder (12) is provided with a reinforcing member (14). When the abutting block (132) abuts against the side wall of the filter cylinder (7), the reinforcing member (14) and the limiting rod (131) cooperate to restrict the limiting rod (131) from rotating.

7. The triethylamine dehydration device according to claim 6, characterized in that: The side wall of the limiting rod (131) is provided with an annular groove (15), and the filter cylinder (7) is provided with a slot (16) at one end near the connecting cylinder (12). When the abutting block (132) abuts against the side wall of the filter cylinder (7), the slot (16) and the annular groove (15) correspond to each other. The reinforcing member (14) includes a connecting ring (141) sleeved on the outer wall of the connecting cylinder (12) and a plug rod (142) is provided on the connecting ring (141). The plug rod (142) can be inserted into the annular groove (15), and the side wall of the connecting cylinder (12) is provided with an elastic element (17) for driving the plug rod (142) to be inserted into the annular groove (15).

8. The triethylamine dehydration device according to claim 7, characterized in that: The elastic element (17) includes a spring sleeved on the side wall of the connecting cylinder (12), one end of the spring being connected to the inner wall of the straight cylinder section (21) and the other end being connected to the connecting ring (141).

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