Rectification coupling pervaporation membrane separation device

Abstract

The utility model discloses a rectification coupling pervaporation membrane separation device, relates to the technical field of rectification separation, and aims to solve the problems that rectified raw material liquid needs to be heated and vaporized to a saturated or supersaturated state outside a membrane component again to facilitate subsequent separation when the conventional vapor permeation membrane is used, and the energy consumption in the secondary evaporation process is relatively high. The reboiler is mounted in the reboiling chamber, the lower end of the reboiler is communicated with the rectifying tower through a runner pipe, and the upper end of the reboiler is communicated with the rectifying tower through a steam inlet pipe; the steam discharge pipe is mounted at the upper end of the rectifying tower, a membrane separator is mounted at one end of the steam discharge pipe, a pressure sensor is mounted on the outer wall of the membrane separator, and the detection end of the pressure sensor penetrates through and extends into the membrane separator; and the flow dividing pipe is installed on the outer wall of the steam discharging pipe, and an electric control three-way valve is installed at the joint of the flow dividing pipe and the steam discharging pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation separation, in particular to a distillation coupled permeation vaporization membrane separation device. Background Art

[0002] A distillation tower is a tower-type gas-liquid contact device for distillation. By utilizing the different volatilities of the components in the mixture, that is, the different vapor pressures of the components at the same temperature, the light components (low-boiling substances) in the liquid phase are transferred to the gas phase, while the heavy components (high-boiling substances) in the gas phase are transferred to the liquid phase, thereby achieving the purpose of separation.

[0003] In order to improve separation efficiency, it is usually used in combination with membrane separation technology. Steam permeation membrane has received widespread attention in the petrochemical, food, pharmaceutical and other industries due to its advantages of high efficiency, energy saving, simple operation and easy control.

[0004] However, when using the steam permeation membrane, the raw liquid after distillation needs to be heated and vaporized again outside the membrane component to a saturated or supersaturated state for subsequent separation, and the secondary evaporation process consumes a lot of energy. Therefore, we propose a distillation-coupled permeation vaporization membrane separation device to solve the above problems. Utility Model Content

[0005] The utility model aims to provide a distillation-coupled permeation vaporization membrane separation device to solve the problem in the above-mentioned background technology that the existing steam permeation membrane needs to heat and vaporize the raw material liquid after distillation to a saturated or supersaturated state outside the membrane component again when in use in order to perform subsequent separation, and the energy consumption of the secondary evaporation process is relatively large.

[0006] To achieve the above object, the utility model provides the following technical solution: a distillation-coupled pervaporation membrane separation device, comprising a reboiling chamber, a distillation tower is installed at the upper end of the reboiling chamber;

[0007] Also includes:

[0008] A reboiler is installed inside the reboiler chamber, and the lower end of the reboiler is connected to the distillation tower through a flow pipe, and the upper end of the reboiler is connected to the distillation tower through a steam inlet pipe;

[0009] A steam discharge pipe is installed at the upper end of the distillation tower, a membrane separator is installed at one end of the steam discharge pipe, a pressure sensor is installed on the outer wall of the membrane separator, and a detection end of the pressure sensor penetrates and extends to the interior of the membrane separator;

[0010] A shunt pipe is installed on the outer wall of the steam exhaust pipe, an electrically controlled three-way valve is installed at the connection between the shunt pipe and the steam exhaust pipe, a condenser is installed at one end of the shunt pipe, a reflux tank is installed at the lower end of the condenser through a pipeline, the reflux tank is connected to the distillation tower through a reflux pipe, and a reflux pump is installed inside the reflux pipe.

[0011] Preferably, a first metering pump interface is installed on one side of the lower end of the distillation tower, and a second metering pump interface is installed on one side of the upper end of the distillation tower.

[0012] Preferably, membrane wire positioning plates are installed at the upper and lower ends of the membrane separator, membrane wires are installed between the membrane wire positioning plates, and multiple membrane wires are arranged, a finished product outlet is arranged on one side of the membrane separator, and a separation liquid outlet is arranged at the lower end of the membrane separator.

[0013] Preferably, the distillation tower is internally installed with tower plates, a plurality of tower plates are provided, and adjacent tower plates are staggered and arranged opposite to each other.

[0014] Preferably, a jacket is installed on the outer wall of the reboiler, a steam inlet is arranged on one side of the front end of the jacket, and a steam return port is arranged on the other side of the front end of the jacket.

[0015] Preferably, a residual material valve is installed at the lower end of the reflux tank.

[0016] Preferably, shock-absorbing supports are installed on both sides of the lower surface of the reboiler chamber.

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

[0018] 1. The utility model introduces distillation equipment before the molecular sieve membrane equipment, and the solvent vapor at the top of the distillation tower directly enters the membrane separation system in the form of gas phase, thereby realizing the coupled operation of distillation and membrane separation, shortening the process, and significantly reducing the energy consumption generated by the secondary evaporation process of the molecular sieve membrane equipment. It solves the problem that the existing steam permeable membrane needs to heat and vaporize the raw material liquid after distillation to a saturated or supersaturated state outside the membrane component for subsequent separation, and the energy consumption of the secondary evaporation process is relatively large.

[0019] 2. By installing a pressure sensor in the membrane separator, when the internal pressure is detected to be too high, in order to avoid damage to the inner membrane, the pressure sensor feeds back a signal to the controller, drives the electronically controlled three-way valve to adjust to the diverter flow channel, separates part of the steam into the condenser, liquefies it and flows into the reflux tank, and then returns it to the tower through the reflux pump. At the same time, the metering pump reduces the supply amount to achieve the purpose of regulating the pressure drop and controlling the distillation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0021] Figure 2 It is a schematic diagram of the back structure of the utility model;

[0022] Figure 3 This is a schematic diagram of the front internal structure of the utility model;

[0023] Figure 4 This is a schematic diagram of the internal structure of the membrane separator of the utility model;

[0024] In the figure: 1. reboiling chamber; 2. shock-absorbing support; 3. distillation tower; 4. steam inlet pipe; 5. first metering pump interface; 6. second metering pump interface; 7. steam discharge pipe; 8. membrane separator; 801. membrane wire positioning plate; 802. membrane wire; 803. finished product outlet; 804. separation liquid outlet; 805. pressure sensor; 9. diverter; 10. electric three-way valve; 11. condenser; 12. reflux tank; 13. residual valve; 14. reflux pipe; 15. reflux pump; 16. steam inlet; 17. steam return; 18. tower plate; 19. reboiler; 20. jacket; 21. circulation pipe. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0026] See also Figure 1-4 , the utility model provides an embodiment: a distillation-coupled pervaporation membrane separation device, comprising a reboiling chamber 1, a distillation tower 3 is installed at the upper end of the reboiling chamber 1;

[0027] Also includes:

[0028] A reboiler 19 is installed inside the reboiler chamber 1, and the lower end of the reboiler 19 is connected to the distillation tower 3 through the flow pipe 21, and the upper end of the reboiler 19 is connected to the distillation tower 3 through the steam inlet pipe 4;

[0029] A steam discharge pipe 7 is installed at the upper end of the distillation tower 3, a membrane separator 8 is installed at one end of the steam discharge pipe 7, a pressure sensor 805 is installed on the outer wall of the membrane separator 8, and a detection end of the pressure sensor 805 penetrates and extends to the inside of the membrane separator 8;

[0030] A shunt pipe 9 is installed on the outer wall of the steam exhaust pipe 7. An electrically controlled three-way valve 10 is installed at the connection between the shunt pipe 9 and the steam exhaust pipe 7. A condenser 11 is installed at one end of the shunt pipe 9. A reflux tank 12 is installed at the lower end of the condenser 11 through a pipeline. The reflux tank 12 is connected to the distillation tower 3 through a reflux pipe 14. A reflux pump 15 is installed inside the reflux pipe 14.

[0031] See also Figure 1 A first metering pump interface 5 is installed on one side of the lower end of the distillation tower 3, and a second metering pump interface 6 is installed on one side of the upper end of the distillation tower 3. The first metering pump interface 5 and the second metering pump interface 6 are used to supply raw materials and water vapor respectively. The use of metering pumps can keep the feed components constant. The device regulates the discharge of the distillation tower through the pressure drop of the entire tower. The pressure sensor 805 detects the pressure in the terminal membrane separator 8, and the feedback signal can control the pressure of the distillation tower kettle and the heating amount of the kettle, thereby regulating the pressure drop and controlling the distillation effect.

[0032] See also Figure 4 Membrane wire positioning plates 801 are installed at the upper and lower ends of the membrane separator 8, membrane wires 802 are installed between the membrane wire positioning plates 801, and a plurality of membrane wires 802 are arranged. A finished product outlet 803 is arranged on one side of the membrane separator 8, and a separation liquid outlet 804 is arranged at the lower end of the membrane separator 8. When the distilled gas enters the membrane separator 8, due to the different molecular sizes of the two substances inside the distilled gas, the smaller molecular substances can be adsorbed and penetrated by the membrane wires 802 under the action of the pressure difference, and then flow to the lower end of the membrane separator 8 and be discharged along the separation liquid outlet 804, while the large molecular substances are isolated by the membrane wires 802 and discharged from the finished product outlet 803, thereby achieving separation.

[0033] See also Figure 3 The distillation tower 3 is internally provided with a tower plate 18, wherein a plurality of tower plates 18 are provided, and adjacent tower plates 18 are staggered and oppositely arranged, and a plurality of through holes are provided in the tower plate 18 for deflecting the raw material and the reflux liquid while transferring heat between them and the steam.

[0034] See also Figure 3 A jacket 20 is installed on the outer wall of the reboiler 19, a steam inlet 16 is provided on one side of the front end of the jacket 20, and a steam return port 17 is provided on the other side of the front end of the jacket 20. The jacket 20 is connected to the steam generator through the steam inlet 16 and the steam return port 17, and is used to heat the liquefied material at the bottom of the tower to evaporate and gasify it.

[0035] See also Figure 1 A residual material valve 13 is installed at the lower end of the reflux tank 12, and the residual material valve 13 is used to discharge the residual material in the reflux tank 12 after the separation is completed.

[0036] See also Figure 1 Shock-absorbing supports 2 are installed on both sides of the lower surface of the reboiler 1. The shock-absorbing supports 2 are made of rubber material and are used to ensure the stability of the device.

[0037] Working principle: When in use, the metering pump passes the raw material and water vapor into the distillation tower 3 from the first metering pump interface 5 and the second metering pump interface 6 respectively. The feed composition is kept constant by the metering pump. During the process, the steam generator supplies steam to the jacket 20 of the reboiler 19 to reboil the liquid at the bottom of the tower. The water vapor and the reboiler 19 work together to control the top temperature of the tower, so that the unreacted raw materials are distilled azeotropically. The distilled mixed steam directly enters the membrane separator 8 through the steam discharge pipe 7. When the distilled gas enters the membrane separator 8, due to the different molecular sizes of the two substances in the distilled gas, the smaller molecular substance can be separated under the pressure difference. The membrane filaments 802 absorb and permeate, and then flow to the lower end of the membrane separator 8 and are discharged along the separation liquid outlet 804, while the macromolecular substances are isolated by the membrane filaments 802 and discharged from the finished product outlet 803, thereby achieving separation. A pressure sensor 805 is installed on the membrane separator 8. When it is detected that the internal pressure is too high, in order to avoid damage to the inner membrane, the pressure sensor 805 feeds back a signal to the controller, drives the electronically controlled three-way valve 10 to adjust to the flow channel of the diverter pipe 9, separates part of the steam into the condenser 11, and liquefies it and flows into the reflux tank 12, and is returned to the tower through the reflux pump 15. At the same time, the metering pump reduces the supply amount to achieve the purpose of regulating the pressure drop and controlling the distillation effect.

[0038] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

Claims

1. A distillation-coupled pervaporation membrane separation device, comprising a reboiling chamber (1), wherein a distillation tower (3) is installed at the upper end of the reboiling chamber (1); Features: Also includes: A reboiler (19) is installed inside the reboiler chamber (1), and the lower end of the reboiler (19) is connected to the distillation tower (3) through a flow pipe (21), and the upper end of the reboiler (19) is connected to the distillation tower (3) through a steam inlet pipe (4); a steam discharge pipe (7) installed at the upper end of the distillation tower (3); a membrane separator (8) is installed at one end of the steam discharge pipe (7); a pressure sensor (805) is installed on the outer wall of the membrane separator (8); and a detection end of the pressure sensor (805) penetrates and extends into the interior of the membrane separator (8); A shunt pipe (9) is installed on the outer wall of the steam discharge pipe (7); an electrically controlled three-way valve (10) is installed at the connection between the shunt pipe (9) and the steam discharge pipe (7); a condenser (11) is installed at one end of the shunt pipe (9); a reflux tank (12) is installed at the lower end of the condenser (11) through a pipeline; the reflux tank (12) is connected to the distillation tower (3) through a reflux pipe (14); and a reflux pump (15) is installed inside the reflux pipe (14).

2. A distillation-coupled pervaporation membrane separation device according to claim 1, characterized in that: A first metering pump interface (5) is installed on one side of the lower end of the distillation tower (3), and a second metering pump interface (6) is installed on one side of the upper end of the distillation tower (3).

3. A distillation-coupled pervaporation membrane separation device according to claim 1, characterized in that: Membrane wire positioning plates (801) are installed at the upper and lower ends of the membrane separator (8), membrane wires (802) are installed between the membrane wire positioning plates (801), and a plurality of membrane wires (802) are provided. A finished product outlet (803) is provided on one side of the membrane separator (8), and a separation liquid outlet (804) is provided at the lower end of the membrane separator (8).

4. A distillation-coupled pervaporation membrane separation device according to claim 1, characterized in that: The distillation tower (3) is internally provided with a tower plate (18), a plurality of tower plates (18) are provided, and adjacent tower plates (18) are arranged in a staggered manner and opposite to each other.

5. The distillation-coupled pervaporation membrane separation device according to claim 1, characterized in that: A jacket (20) is installed on the outer wall of the reboiler (19), a steam inlet (16) is arranged on one side of the front end of the jacket (20), and a steam return port (17) is arranged on the other side of the front end of the jacket (20).

6. The distillation-coupled pervaporation membrane separation device according to claim 1, characterized in that: A residual material valve (13) is installed at the lower end of the reflux tank (12).

7. The distillation-coupled pervaporation membrane separation device according to claim 1, characterized in that: Shock-absorbing supports (2) are installed on both sides of the lower surface of the reboiling chamber (1).

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