Liquid drainage system of polytetrahydrofuran vacuum pump
By designing a system with three sets of vacuum pumps and gas-liquid separation tanks in a polytetrahydrofuran unit, gas-liquid separation is achieved using baffles and separation plates, solving the problem of incomplete liquid drainage and improving the operational stability of the vacuum pumps and the safety of the equipment.
Patent Information
- Application Number
- CN202520052129.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-09
- Publication Date
- 2025-12-12
- Estimated Expiration
- 2035-01-09
AI Technical Summary
In existing polytetrahydrofuran (PTF) units, the gas-liquid separator is susceptible to airflow, resulting in low separation efficiency, incomplete liquid drainage, and liquid carryover in the vacuum pump, which can cause equipment failure and pose safety hazards.
Design a system comprising three sets of vacuum pumps and a gas-liquid separation tank. The gas-liquid separation tank is equipped with baffles and separation plates. When gas passes through the inner cavity, the liquid gathers and is discharged under the action of gravity, achieving complete gas-liquid separation and preventing liquid from being carried over to the vacuum pump.
It improves the operational stability of the vacuum pump, avoids equipment failure, ensures the safety and stability of the equipment, and reduces equipment damage caused by human factors.
Smart Images
Figure CN223662074U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of polytetrahydrofuran production technology, and more specifically, to a polytetrahydrofuran vacuum pump drainage system. Background Technology
[0002] The existing polytetrahydrofuran (PTF) plants in China mainly involve the ring-opening polymerization of refined tetrahydrofuran, acetic acid, and acetic anhydride under the action of a catalyst to produce the intermediate polytetramethylene ether diacetate. This process is basically operated in a vacuum environment, with three complete sets of vacuum pumps PP-C9301A / B / C providing the corresponding vacuum for the production equipment.
[0003] The C9301B / C vacuum pump provides 370 mmHg pressure for the reactor system (R9301 and E9301), 250 mmHg pressure for the distillation tank system (D9301 and E9303), and 450 mmHg pressure for the THF separator system (V9301 and E9305); the C9301A provides 20 mmHg pressure for the stripping tower system (V9302 and E9307).
[0004] The C9301 complete package system is selected with a dry screw vacuum pump. Each inlet is equipped with a gas-liquid separator. To prevent cross-pressure in the system, only one vacuum pump (i.e., one of C9301A / B / C) can be turned on for each discharge. Because the existing gas-liquid separator is easily affected by airflow, the separation efficiency is low. This will cause incomplete discharge, resulting in liquid carrying in the vacuum pump, which will cause equipment failure and damage, and bring great safety hazards to the company's production. Utility Model Content
[0005] The purpose of this invention is to provide a liquid drainage system for a polytetrahydrofuran vacuum pump, which can avoid the problem of liquid carrying in the vacuum pump and causing equipment failure and damage due to incomplete drainage; improve the operational stability of the polymer vacuum pump and avoid damage to the equipment caused by human factors.
[0006] The embodiments of this utility model are achieved through the following technical solutions:
[0007] A polytetrahydrofuran vacuum pump drainage system includes three sets of vacuum pumps and three sets of gas-liquid separation tanks respectively installed at the inlet end of the three sets of vacuum pumps.
[0008] The gas-liquid separator includes a tank body, with an air inlet and an exhaust outlet respectively provided on the upper part of the tank body, and a liquid outlet provided on the lower part of the tank body;
[0009] A partition is vertically arranged around the inside of the tank. The top and bottom of the partition are sealed to the top and bottom walls of the tank, respectively. The partition divides the inner cavity of the tank into an independent outer cavity and an inner cavity. The partition has several openings connecting the outer cavity and the inner cavity.
[0010] The air inlet is arranged outside the outer cavity, and the air outlet and the liquid outlet are arranged at the top and bottom of the inner cavity respectively;
[0011] The inner cavity is further provided with a plurality of separation plates, the separation plates are connected to the inner side of the partition plate, and the separation plates are provided with air vents for gas circulation.
[0012] Further, the through port is located at the lower part of the partition plate close to the bottom wall of the tank body, and there is a certain spacing between the through port and the bottom wall of the tank body.
[0013] Further, the through port is arranged along the circumference of the partition plate.
[0014] Further, the separation plates are arranged longitudinally.
[0015] Further, one end of the separation plate is connected to the inner side of the partition plate, and the other end is spaced from the partition plate, and the spacing forms the air vent.
[0016] Further, the plurality of separation plates are arranged obliquely, and are arranged obliquely from high to low from one end close to the partition plate to one end of the air vent.
[0017] Further, the inclination directions of the two adjacent separation plates are opposite.
[0018] Further, the low end of the separation plate close to the through port is arranged away from the through port.
[0019] Further, the liquid outlets of the three groups of gas-liquid separation tanks are connected with liquid outlet pipes, and the three groups of liquid outlet pipes are connected with a liquid discharge pipe through a pipeline.
[0020] The technical scheme of the utility model has at least the following advantages and beneficial effects:
[0021] In use, the gas mixed with liquid enters the outer cavity of the tank body through the air inlet and is blocked by the partition plate, then enters the inner cavity through the through port at the bottom of the partition plate, and flows from bottom to top through the air vents on the separation plates in the inner cavity. In this process, the liquid in the gas is blocked by the separation plates and gathered at the bottom of the separation plates under the action of gravity, then falls from top to bottom to the bottom of the tank body and is discharged through the liquid outlet. This can better separate gas and liquid, obtain relatively pure gas, collect liquid in time, prevent interference to the gas, avoid incomplete liquid discharge causing the problem of liquid carrying of the vacuum pump and equipment failure and damage, improve the running stability of the polymerization vacuum pump, and avoid damage to the equipment caused by human factors. BRIEF DESCRIPTION OF DRAWINGS
[0022] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.
[0023] Figure 1 The flow chart of the polytetrahydrofuran vacuum pump liquid discharge system provided by the embodiments of the present application is shown in the figure.
[0024] Figure 2 The structural schematic diagram of the gas-liquid separation tank provided by the embodiments of the present application is shown in the figure.
[0025] Icon: 1-vacuum pump, 2-gas-liquid separation tank, 21-tank body, 22-air inlet, 23-outer cavity, 24-inner cavity, 25-communication port, 26-exhaust port, 27-separation plate, 28-vent, 29-baffle, 210-liquid outlet, 3-liquid outlet pipe, 4-liquid discharge pipe. DETAILED DESCRIPTION
[0026] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.
[0027] Embodiment 1
[0028] A polytetrahydrofuran vacuum pump liquid discharge system comprises three groups of vacuum pumps 1 and three groups of gas-liquid separation tanks 2 respectively arranged at the inlet ends of the three groups of vacuum pumps 1.
[0029] The gas-liquid separation tank 2 comprises a tank body 21, an air inlet 22 and an exhaust port 26 arranged at the upper part of the tank body 21, and a liquid outlet 210 arranged at the lower part of the tank body 21.
[0030] A baffle 29 is arranged in the tank body 21 in the vertical direction, the top and bottom of the baffle 29 are respectively in sealing connection with the top wall and bottom wall of the tank body 21, the baffle 29 divides the inner cavity of the tank body 21 into independent outer cavity 23 and inner cavity 24, and a plurality of communication ports 25 communicating the outer cavity 23 and the inner cavity 24 are arranged on the baffle 29.
[0031] The air inlet 22 is arranged outside the outer cavity 23, and the exhaust port 26 and the liquid outlet 210 are respectively arranged at the top and bottom of the inner cavity 24.
[0032] The inner cavity 24 is further provided with a plurality of separation plates 27, the separation plates 27 are connected to the inner side of the partition plate 29, and the separation plates 27 are provided with gas passages 28 for gas circulation.
[0033] Working principle: when the utility model is used, the gas mixed with liquid enters the outer cavity 23 of the tank body 21 through the gas inlet 22 and is blocked by the partition plate 29, then enters the inner cavity 24 through the through hole 25 at the bottom of the partition plate 29, and circulates from bottom to top in the inner cavity 24 by passing through the gas passages 28 on the separation plates 27 in turn, in this process, the liquid in the gas is blocked by the separation plates 27, and under the action of gravity, the liquid is gathered at the bottom of the separation plates 27, then falls from top to bottom to the bottom of the tank body 21 and is discharged through the liquid outlet 210, so that the gas-liquid separation can be better, the relatively pure gas can be obtained, the liquid can be collected in time, the interference to the gas is prevented, the problem that the incomplete liquid discharge causes the liquid-carrying of the vacuum pump 1 to cause the equipment failure and damage is avoided, the operation stability of the polymerization vacuum pump 1 is improved, and the damage to the equipment caused by artificial factors is avoided.
[0034] Preferably, the bottom of the tank body 21 can be provided with a structure that is low in the middle and high around, and the liquid outlet 210 is arranged at the low position, so that the collected liquid is more concentrated and discharged more completely from the tank body 21.
[0035] Working principle: when the utility model is used, the gas mixed with liquid enters the outer cavity 23 of the tank body 21 through the gas inlet 22 and is blocked by the partition plate 29, then enters the inner cavity 24 through the through hole 25 at the bottom of the partition plate 29, and circulates from bottom to top in the inner cavity 24 by passing through the gas passages 28 on the separation plates 27 in turn, in this process, the liquid in the gas is blocked by the separation plates 27, and under the action of gravity, the liquid is gathered at the bottom of the separation plates 27, then falls from top to bottom to the bottom of the tank body 21 and is discharged through the liquid outlet 210, so that the gas-liquid separation can be better, the relatively pure gas can be obtained, the liquid can be collected in time, the interference to the gas is prevented, the problem that the incomplete liquid discharge causes the liquid-carrying of the vacuum pump 1 to cause the equipment failure and damage is avoided, the operation stability of the polymerization vacuum pump 1 is improved, and the damage to the equipment caused by artificial factors is avoided.
[0036] Preferably, the bottom of the tank body 21 can be provided with a structure that is low in the middle and high around, and the liquid outlet 210 is arranged at the low position, so that the collected liquid is more concentrated and discharged more completely from the tank body 21.
[0037] In the embodiment, the through hole 25 is located at the lower part of the partition plate 29 close to the bottom wall of the tank body 21, and there is a certain spacing between the through hole 25 and the bottom wall of the tank body 21, preferably, the spacing is 5-10cm, so that the gas in the inner cavity 24 has enough upward circulation path, so that better gas-liquid separation effect can be achieved.
[0038] In the embodiment, the through holes 25 are arranged along the circumference of the partition plate 29; in this way, more air can be processed, and the processing efficiency is improved; however, in order not to affect the gas-liquid separation effect, the number of the through holes 25 should not be too large, and preferably, the number of the through holes 25 is 1-3, and the through holes 25 are arranged away from the lowest air passage 28.
[0039] In the embodiment, the separation plates 27 are arranged in the longitudinal direction, and the separation plates 27 are all arranged in an inclined manner; one end of the separation plate 27 is connected to the inner side of the partition plate 29, and the other end is spaced from the partition plate 29, and the spacing forms the air passage 28; and from the end close to the partition plate 29 to the end of the air passage 28, the separation plates 27 are arranged in a high-to-low inclined manner; in this way, the liquid blocked at the bottom of the upper separation plate 27 can fall onto the upper surface of the lower separation plate 27, and then slide down along the surface of the inclined separation plate 27, so that the liquid remaining on the upper surface of the lower separation plate 27 and the liquid blocked at the lower surface of the lower separation plate 27 can all slide down, and the liquid can be collected at the bottom of the tank 21 and discharged through the liquid outlet 210; therefore, by arranging the separation plates 27 in an inclined manner, the gas-liquid separation effect is ensured, and the liquid separated can all fall to the bottom of the tank 21 for collection, so that the problem of secondary mixing of the liquid with the upward gas and incomplete discharge of the gas is avoided.
[0040] In the embodiment, the inclination directions of the two adjacent separation plates 27 are opposite, that is, the low end of the upper separation plate 27 is close to the high end of the lower separation plate 27; in this way, the gas forms a S-shaped flow path, and the flow path of the gas is increased, so that the gas-liquid separation effect is better.
[0041] In the embodiment, the low end of the separation plate 27 close to the through hole 25 is arranged away from the through hole 25; in this way, the gas entering the inner cavity 24 from the through hole 25 can flow upward through the air passage 28 far from the through hole 25, so that the gas-liquid separation effect can be achieved in the initial stage, and the flow path of the gas is increased, so that the gas-liquid separation effect is higher.
[0042] In the embodiment, the liquid outlets 210 of the three groups of gas-liquid separation tanks 2 are all connected with liquid outlets 3, and the three groups of liquid outlets 3 are connected with a liquid outlet pipe 4 through a pipeline; in this way, the liquid collected at the bottom of the three groups of gas-liquid separation tanks 2 can be collected and reused in a centralized manner, and the normal use of the vacuum pump 1 is not affected, and the working efficiency is improved.
[0043] The above merely is preferred embodiment of the present utility model, and is not used to limit the present utility model, for the person skilled in the art, the present utility model can have various changes and changes. Any modification, equivalent replacement, improvement etc. that is made within the spirit and principle of the present utility model should be contained in the protection scope of the present utility model.
Claims
1. A polytetrahydrofuran vacuum pump drain system, characterized by, The three groups of vacuum pumps are respectively connected with three groups of gas-liquid separation tanks arranged at the inlet ends of the three groups of vacuum pumps; The gas-liquid separation tank comprises a tank body, an air inlet and an exhaust port are arranged at the upper part of the tank body, and a liquid outlet is arranged at the lower part of the tank body; A vertical partition is arranged around the tank body, the top and bottom of the partition are sealingly connected with the top wall and bottom wall of the tank body, the partition divides the inner cavity of the tank body into an independent outer cavity and an inner cavity, and a plurality of through ports are arranged on the partition and communicate the outer cavity and the inner cavity, The air inlet is arranged outside the outer cavity, and the exhaust port and the liquid outlet are arranged at the top and bottom of the inner cavity, respectively; A plurality of separation plates are further arranged in the inner cavity, the separation plates are connected with the inner side of the partition, and the separation plates are provided with gas passages for gas flow.
2. The polytetrahydrofuran vacuum pump drain system according to claim 1, characterized in that, The through port is located at the lower part of the partition close to the bottom wall of the tank body, and a certain spacing is provided between the through port and the bottom wall of the tank body.
3. The polytetrahydrofuran vacuum pump drain system according to claim 2, characterized in that, The through port is arranged along the circumference of the partition.
4. The polytetrahydrofuran vacuum pump drain system of claim 1, wherein, The separation plates are arranged in the longitudinal direction.
5. The polytetrahydrofuran vacuum pump drain system of claim 4, wherein, One end of the separation plate is connected with the inner side of the partition, and the other end is spaced from the partition, and the spacing forms the gas passage.
6. The polytetrahydrofuran vacuum pump drain system of claim 5, wherein, The plurality of separation plates are arranged in an inclined manner, and are arranged in an inclined manner from high to low from one end close to the partition to one end of the gas passage.
7. The polytetrahydrofuran vacuum pump drain system of claim 6, wherein, The inclination directions of the two adjacent separation plates are opposite.
8. The polytetrahydrofuran vacuum pump drain system of claim 7, wherein, The low end of the separation plate close to the through port is arranged away from the through port.
9. The polytetrahydrofuran vacuum pump drain system of claim 1, wherein, The liquid outlets of the three groups of gas-liquid separation tanks are connected with liquid outlets, and the three groups of liquid outlets are connected with a liquid outlet pipe through a pipeline.