Automatic furfural stock solution separation device

Abstract

The utility model discloses an automatic furfural stock solution separating device, which relates to the technical field of furfural production and comprises a first aldehyde separating tank and a second aldehyde separating tank which are symmetrically arranged, and a liquid inlet between the top of the first aldehyde separating tank and the top of the second aldehyde separating tank is respectively connected with two liquid outlets of an electromagnetic three-way ball valve. A first drain pipe, a first electromagnetic valve, a first drain pipe, a first water sensor, a second electromagnetic valve and a second water sensor are arranged on the first formaldehyde separation tank; a second drain pipe, a third electromagnetic valve, a second drain pipe, a third water sensor, a fourth electromagnetic valve and a fourth water sensor are arranged at the bottom of the second formaldehyde separation tank; the controller is used for controlling; the stock solution distillation tower has the advantages that the two aldehyde separation tanks are adopted, the electromagnetic three-way ball valves are controlled by the controller to realize alternate replacement and use of the two aldehyde separation tanks, standing separation of a stock solution of furfural can be automatically realized in each aldehyde separation tank, and the production efficiency of the stock solution distillation tower is improved.

Description

Technical fields:

[0001] This utility model relates to the field of furfural production technology, specifically to an automatic furfural stock solution separation device. Background technology:

[0002] Furfural has the molecular formula C5H4O2. It is a colorless to pale yellow liquid with moderate toxicity and can irritate the skin, eyes, and respiratory tract.

[0003] Furfural stock solution is the initial product of furfural production after hydrolysis and distillation and condensation in a stock solution distillation tower. Its main component is a 35% furfural aqueous solution, and it also contains unreacted raw materials, acidic catalysts (such as sulfuric acid), by-products (such as methanol and acetic acid), and other impurities. After distillation and condensation in the stock solution distillation tower, the furfural stock solution enters an aldehyde separation tank for static separation. Utilizing the limited miscibility between furfural and water, natural stratification forms an upper aqueous phase (containing a small amount of furfural and organic acids) and a lower aldehyde phase (crude furfural). Finally, the valve at the bottom of the aldehyde separation tank is opened to separate the crude furfural first and the aqueous phase last.

[0004] The current technical drawback is that the condensed furfural stock solution is usually in large quantities, requiring it to be introduced into an aldehyde separation tank for settling and stratification. Since the settling and stratification time is long and the furfural stock solution produced by the distillation and condensation of the stock solution is relatively fast, the existing methods require waiting until all the aldehyde phases have been separated before new furfural stock solution can be introduced into the aldehyde separation tank for settling and stratification, which affects the production efficiency of the stock solution distillation tower. Utility model content:

[0005] The purpose of this invention is to provide an automatic furfural stock solution separation device to solve the problems mentioned in the background art.

[0006] This utility model is implemented by the following technical solution:

[0007] An automatic furfural stock solution dispensing device includes a first furfural dispensing tank and a second furfural dispensing tank symmetrically arranged. The inlet between the tops of the first and second furfural dispensing tanks is connected to the two outlets of an electromagnetic three-way ball valve. The bottom of the first furfural dispensing tank has a first drain pipe with a first electromagnetic valve installed on it. The lower middle part of the first furfural dispensing tank, on the same horizontal plane, has a first drain pipe and a first water immersion sensor installed on it. A second electromagnetic valve is installed on the first drain pipe, and a second water immersion sensor is installed in the upper middle part of the first furfural dispensing tank. The bottom of the second furfural dispensing tank has a second drain pipe with a third electromagnetic valve installed on it. The lower middle part of the second furfural dispensing tank, on the same horizontal plane, has a second drain pipe and a third water immersion sensor installed on it. A fourth electromagnetic valve is installed on the second drain pipe, and a fourth water immersion sensor is installed in the upper middle part of the second furfural dispensing tank. The electromagnetic three-way ball valve, the first electromagnetic valve, the first water immersion sensor, the second electromagnetic valve, the second water immersion sensor, the third electromagnetic valve, the third water immersion sensor, the fourth electromagnetic valve, and the fourth water immersion sensor are all electrically connected to a controller via circuitry.

[0008] Preferably, baffles are fixed to the top of the inner walls of both the first and second aldehyde separation tanks, and the baffles correspond to the liquid outlet of the electromagnetic three-way ball valve.

[0009] Preferably, the surfaces of the first and second aldehyde separation containers are provided with viewing mirrors for observing the liquid level, and the viewing mirrors are provided with scale values.

[0010] Preferably, the volume of the first water immersion sensor located in the first aldehyde separation tank is two-tenths of the volume of the second water immersion sensor located in the first aldehyde separation tank.

[0011] Preferably, the volume of the second aldehyde separation tank where the third water immersion sensor is located is two-tenths of the volume of the second aldehyde separation tank where the fourth water immersion sensor is located.

[0012] The advantages of this invention are: it uses two aldehyde separation tanks, and the two aldehyde separation tanks can be alternately used by controlling the electromagnetic three-way ball valve through the controller. Each aldehyde separation tank can automatically achieve static separation of furfural raw solution, thereby improving the production efficiency of the raw solution distillation tower. Attached image description:

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] Figure 2 for Figure 1 Internal structure diagram;

[0015] Figure 3 For control flowchart.

[0016] In the diagram: 1. First aldehyde separation tank; 1.1. First drain pipe; 1.11. First solenoid valve; 1.2. First drain pipe; 1.21. Second solenoid valve; 1.3. First water immersion sensor; 1.4. Second water immersion sensor; 2. Second aldehyde separation tank; 2.1. Second drain pipe; 2.11. Third solenoid valve; 2.2. Second drain pipe; 2.21. Fourth solenoid valve; 2.3. Third water immersion sensor; 2.4. Fourth water immersion sensor; 3. Solenoid three-way ball valve; 4. Controller; 5. Baffle plate; 6. Lens. Detailed implementation method:

[0017] 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.

[0018] Please see Figure 1-3 This utility model provides a technical solution for an automatic liquid separation device for furfural stock solution:

[0019] An automatic furfural stock solution separation device includes a first furfural separation tank 1 and a second furfural separation tank 2 arranged symmetrically. The inlet between the top of the first furfural separation tank 1 and the second furfural separation tank 2 is connected to the two outlets of an electromagnetic three-way ball valve 3.

[0020] The first aldehyde separation tank 1 has a first drain pipe 1.1 at the bottom, a first solenoid valve 1.11 installed on the first drain pipe 1.1, a first drain pipe 1.2 and a first water immersion sensor 1.3 installed on the lower middle part of the first aldehyde separation tank 1 at the same horizontal plane, a second solenoid valve 1.21 installed on the first drain pipe 1.2, and a second water immersion sensor 1.4 installed on the upper middle part of the first aldehyde separation tank 1.

[0021] The second aldehyde separation tank 2 has a second drain pipe 2.1 at its bottom, and a third solenoid valve 2.11 installed on the second drain pipe 2.1. The lower middle part of the second aldehyde separation tank 2 is equipped with a second drain pipe 2.2 and a third water immersion sensor 2.3 on the same horizontal plane. A fourth solenoid valve 2.21 is installed on the second drain pipe 2.2, and a fourth water immersion sensor 2.4 is installed in the upper middle part of the second aldehyde separation tank 2. The electromagnetic three-way ball valve 3, the first solenoid valve 1.11, the first water immersion sensor 1.3, the second solenoid valve 1.21, the second water immersion sensor 1.4, the third solenoid valve 2.11, the third water immersion sensor 2.3, the fourth solenoid valve 2.21, and the fourth water immersion sensor 2.4 are respectively electrically connected to the controller 4 through circuits.

[0022] Both the top of the inner wall of the first aldehyde separation tank 1 and the second aldehyde separation tank 2 are fixed with baffles 5. The baffles 5 correspond to the liquid outlet of the electromagnetic three-way ball valve 3. The baffles 5 can be used to guide the incoming furfural stock solution and reduce the violent fluctuations of the liquid level in the tank.

[0023] The surface of the first aldehyde separating tank 1 and the second aldehyde separating tank 2 is equipped with a viewing mirror 6 for observing the liquid level. The viewing mirror 6 has a scale value, and the staff can observe the liquid level in the tank through the viewing mirror 6.

[0024] Because the furfural stock solution entering the tank typically contains 35% furfural, and considering the limited miscibility of furfural with water and the fact that furfural is denser than water, after settling, it forms an aldehyde phase and an aqueous phase, with the aldehyde phase located below the aqueous phase. Furthermore, the total volume of the furfural stock solution after settling remains the same as before settling. Therefore, the 35% liquid at the bottom is usually the aldehyde phase. However, slight fluctuations may occur in practice. Therefore, the installation positions of the water immersion sensors in this application are required as follows:

[0025] The volume of the first water immersion sensor 1.3 located in the first aldehyde separation tank 1 is two-tenths of the volume of the second water immersion sensor 1.4 located in the first aldehyde separation tank 1. The volume of the third water immersion sensor 2.3 located in the second aldehyde separation tank 2 is two-tenths of the volume of the fourth water immersion sensor 2.4 located in the second aldehyde separation tank 2; after settling, the liquid below the locations of the first water immersion sensor 1.3 and the third water immersion sensor 2.3 must be a high-purity aldehyde phase.

[0026] In summary, the liquid above the locations of the first water immersion sensor 1.3 and the third water immersion sensor 2.3 can be considered as the aqueous phase. This aqueous phase preferentially flows back to the raw material distillation tower through the first drain pipe 1.2 or the second drain pipe 2.2 for redistillation and condensation, thereby improving the purity of furfural in the furfural raw material. Finally, the aldehyde phase is discharged through the first drain pipe 1.1 or the second drain pipe 2.1.

[0027] like Figure 2 and 3As shown, during operation, the furfural stock solution enters through the inlet of the electromagnetic three-way ball valve 3. The left inlet 3.1 of the electromagnetic three-way ball valve 3 is opened by the controller 4, allowing the furfural stock solution to flow into the first aldehyde separation tank 1. All valves in the first aldehyde separation tank 1 are closed. When the liquid level reaches the location of the second water immersion sensor 1.4, the second water immersion sensor 1.4 sends an electrical signal to the controller 4. The controller 4 then randomly closes the electromagnetic three-way ball valve 3 and, after a 24-hour delay (standing time), opens the second electromagnetic valve 1.21, discharging the aqueous phase from the first aldehyde separation tank 1 and returning it to the stock solution distillation tower for further distillation and condensation. When the liquid level is lower than the first water immersion sensor 1.3, the first water immersion sensor 1.3 will send an electrical signal to the controller 4. The controller 4 will control the first solenoid valve 1.11 to open and the second solenoid valve 1.21 to close, so that the aldehyde phase in the first aldehyde separation tank 1 is discharged into the storage tank for storage. The time it takes for the aldehyde phase in the first aldehyde separation tank 1 to flow out is used as the delay setting value for the controller 4 to control the opening of the first solenoid valve 1.11, so that the first solenoid valve 1.11 can be automatically closed.

[0028] The second aldehyde separator 2 is a backup separator. When the first aldehyde separator 1 is in the settling and stratification process, the right inlet 3.2 of the electromagnetic three-way ball valve 3 can be opened by manually operating the controller 4, allowing new furfural stock solution to flow into the second aldehyde separator 2. When the furfural stock solution flows into the second aldehyde separator 2, all valves in the second aldehyde separator 2 are closed. When the liquid level reaches the position of the fourth water immersion sensor 2.4, the fourth water immersion sensor 2.4 will send an electrical signal to the controller 4. The controller 4 will randomly control the electromagnetic three-way ball valve 3 to close the valve, and after a delay of 24 hours (settling time), control the fourth electromagnetic valve 2.21 to open, discharging the water phase in the second aldehyde separator 2 and sending it back to the stock solution distillation tower for redistillation and condensation. When the liquid level is lower than the third water immersion sensor 2.3, the third water immersion sensor 2.3 will send an electrical signal to the controller 4. The controller 4 will control the third solenoid valve 2.11 to open and the fourth solenoid valve 2.21 to close, so that the aldehyde phase in the second aldehyde separation tank 2 is discharged into the storage tank for storage. The time it takes for the aldehyde phase in the second aldehyde separation tank 2 to flow out is used as the delay setting value for the controller 4 to control the opening of the third solenoid valve 2.11, so that the third solenoid valve 2.11 can be automatically closed.

[0029] The controller 4 can also be manually operated to open or close a single solenoid valve, and the liquid discharge can be controlled by observing the fluoroscopic lens 6 to ensure the normal operation of the entire device.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A furaldehyde stock solution automatic dispensing device, characterized by: The application relates to a kind of first subaldehyde tank (1) and second subaldehyde tank (2) including symmetrically arranged liquid inlet between the top of the first subaldehyde tank (1) and the second subaldehyde tank (2) is connected with the two liquid outlets of electromagnetic three-way ball valve (3) respectively, the bottom of the first subaldehyde tank (1) is provided with first liquid discharge pipe (1.1), first solenoid valve (1.11) is installed on the first liquid discharge pipe (1.1), the middle lower part of the first subaldehyde tank (1) is installed with first drain pipe (1.2) and first water immersion sensor (1.3) on the same horizontal plane, second solenoid valve (1.21) is installed on the first drain pipe (1.2), the middle upper part of the first subaldehyde tank (1) is installed with second water immersion sensor (1.4); The bottom of the second subaldehyde tank (2) is provided with second liquid discharge pipe (2.1), third solenoid valve (2.11) is installed on the second liquid discharge pipe (2.1), the middle lower part of the second subaldehyde tank (2) is installed with second drain pipe (2.2) and third water immersion sensor (2.3) on the same horizontal plane, fourth solenoid valve (2.21) is installed on the second drain pipe (2.2), the middle upper part of the second subaldehyde tank (2) is installed with fourth water immersion sensor (2.4); The electromagnetic three-way ball valve (3), first solenoid valve (1.11), first water immersion sensor (1.3), second solenoid valve (1.21), second water immersion sensor (1.4), third solenoid valve (2.11), third water immersion sensor (2.3), fourth solenoid valve (2.21) and fourth water immersion sensor (2.4) are electrically connected with controller (4) through line respectively.

2. The automatic furfural stock solution dispensing device according to claim 1, characterized in that: The top of the inner wall of the first subaldehyde tank (1) and the second subaldehyde tank (2) is fixed with baffle (5) respectively, the baffle (5) and the liquid outlet of electromagnetic three-way ball valve (3) correspond.

3. The automatic furfural stock solution dispensing device according to claim 2, characterized in that: The surface of the first subaldehyde tank (1) and the second subaldehyde tank (2) is provided with perspective mirror (6) for observing liquid level, and the perspective mirror (6) is provided with scale value.

4. The automatic furfural stock solution dispensing device according to claim 3, characterized in that: The position volume of the first subaldehyde tank (1) where the first water immersion sensor (1.3) is located is one tenth of the position volume of the first subaldehyde tank (1) where the second water immersion sensor (1.4) is located.

5. The automatic furfural stock solution dispensing device according to claim 4, characterized in that: The position volume of the second subaldehyde tank (2) where the third water immersion sensor (2.3) is located is one tenth of the position volume of the second subaldehyde tank (2) where the fourth water immersion sensor (2.4) is located.

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