A phenol rectification equipment for production of dicamba

Abstract

The utility model provides a kind of phenol rectification equipment for production of dicamba, it is related to phenol purification technical field, including water storage tank, phenol storage tank, negative pressure distillation kettle, rectification tower being connected with the gas phase pipeline of negative pressure distillation kettle and the input pipeline being connected with the conveying pipe of rectification tower, first discharge pipe is provided on water storage tank and first electric valve is provided on first discharge pipe, second discharge pipe is provided on phenol storage tank and second electric valve is provided on second discharge pipe;After the distillation rectification condensation separate discharge of low-boiling-point substance (water and dichlorophenol) is completed in this application successively, material in water storage tank is no longer needed secondary evaporation to separate out dichlorophenol secondary utilization, the separation of water and dichlorophenol is conveniently realized by physical method, at the same time, the discharge of water / dichlorophenol into water storage tank / phenol storage tank is completed by temperature sensor real-time monitoring and automatic switching three-way valve, and then the distillation rectification purification process for phenol crude product is optimized and improved.

Description

Technical Field

[0001] This utility model relates to the field of phenol purification technology, and more specifically, to a phenol distillation device for the production of dicamba. Background Technology

[0002] Currently, a negative pressure distillation kettle is used to heat and vaporize crude phenol so that the low-boiling-point substances (water vapor and dichlorophenol) flow into the distillation column through the gas phase pipeline (the high-boiling-point substances are left at the bottom of the distillation kettle and discharged later). Then, the water vapor after distillation is first condensed and liquefied and flows into the water storage tank, and the dichlorophenol and its isomers are subsequently condensed and liquefied and flow into the phenol storage tank for collection.

[0003] However, a small amount of dichlorophenol is mixed into the collected water after each round of distillation and rectification. Since dichlorophenol is in an oily state, it will separate into layers with the water. After multiple rounds of distillation and rectification, the material in the water storage tank needs to be evaporated a second time to separate the water and dichlorophenol again. The remaining dichlorophenol can then be reused to improve the utilization rate. However, there is currently a lack of simple and effective physical separation measures. At the same time, the discharge process of water and dichlorophenol lacks the design of automatic monitoring and directional collection. Therefore, the distillation and rectification purification process for crude phenol needs to be optimized. Utility Model Content

[0004] The purpose of this utility model is to solve the problems mentioned in the background art, and then to propose a phenol distillation device for the production of dicamba.

[0005] The technical solution adopted by this utility model to solve its technical problem is: A phenol distillation apparatus for dicamba production includes a water storage tank, a phenol storage tank, a negative pressure distillation kettle, a distillation column connected to a vapor phase pipeline of the negative pressure distillation kettle, and a delivery pipe connected to an input pipeline of the distillation column. The water storage tank is equipped with a first discharge pipe and a first electric valve. The phenol storage tank is equipped with a second discharge pipe and a second electric valve. A temperature sensor is installed inside the negative pressure distillation kettle. The apparatus also includes a three-way valve. One of the three-way pipes is connected to the delivery pipe. The remaining two pipes of the three-way pipe are respectively equipped with a third electric valve and a fourth electric valve, and are connected to the water storage tank and the phenol storage tank through two flow pipes respectively. The third electric valve, the fourth electric valve and the temperature sensor are all electrically connected to the PLC control panel. The overflow pipe connects to the water storage tank; The first collection box is fixed on the water storage tank and connected to the overflow pipe. The first collection box is equipped with a first suction pump that is electrically connected to the PLC control panel and connected to the bottom of the inside of the first collection box. A transparent observation window is installed on the water storage tank; The non-contact liquid level sensor is installed inside the phenol storage tank; The second collection box is connected to the first discharge pipe and the second discharge pipe, and the second collection box is equipped with a second suction pump that is electrically connected to the PLC control panel and connected to the bottom of the inside of the second collection box.

[0006] Furthermore, the first collection box and the second collection box are respectively equipped with a second liquid level sensor and a third liquid level sensor that are electrically connected to the PLC control panel.

[0007] Furthermore, the water storage tank is equipped with a porous buffer mesh frame with a polytetrafluoroethylene hydrophobic coating on its surface, and the porous buffer mesh frame is higher than the overflow pipe.

[0008] Furthermore, the overflow pipe is equipped with a one-way valve that allows only outflow from right to left and not inflow.

[0009] Compared with the prior art, the beneficial effects of this utility model are: Compared to existing technologies, this application completes the separate discharge of low-boiling-point substances (water and dichlorophenol) through distillation, rectification, condensation, and discharge. It eliminates the need for secondary evaporation of materials in the water storage tank to separate dichlorophenol for reuse. The separation of water and dichlorophenol is conveniently achieved through physical means. At the same time, the discharge of water / dichlorophenol into the water storage tank / phenol storage tank is monitored in real time by a temperature sensor and the three-way valve is automatically switched. Thus, the distillation, rectification, and purification process for crude phenol is optimized and improved. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 Schematic diagram of the transparent observation window layout; Figure label: 1. Water storage tank; 101. First discharge pipe; 102. First electric valve; 103. Overflow pipe; 104. Check valve; 105. Transparent observation window; 2. Phenol storage tank; 201. Second discharge pipe; 202. Second electric valve; 203. First liquid level sensor; 3. Delivery pipe; 4. T-connector; 5. Third electric valve; 6. Fourth electric valve; 7. Flow pipe; 8. First collection tank; 9. First suction pump; 10. Second collection tank; 11. Second suction pump; 12. Porous buffer mesh frame. Detailed Implementation

[0011] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model. The present utility model will be further described with reference to the accompanying drawings and embodiments: like Figure 1 and Figure 2 As shown, a phenol distillation apparatus for dicamba production includes a water storage tank 1, a phenol storage tank 2, a negative pressure distillation kettle, a distillation column connected to a vapor phase pipeline of the negative pressure distillation kettle, and a delivery pipe 3 connected to an input pipeline of the distillation column. The water storage tank 1 is equipped with a first discharge pipe 101 and a first electric valve 102. The phenol storage tank 2 is equipped with a second discharge pipe 201 and a second electric valve 202. A temperature sensor is installed inside the negative pressure distillation kettle. The apparatus also includes a three-way pipe 4. One of the pipes of the three-way pipe 4 is connected to the delivery pipe 3. The remaining two pipes of the three-way pipe 4 are respectively equipped with a third electric valve 5 and a fourth electric valve 6, and are connected to the water storage tank 1 and the phenol storage tank 2 through two flow pipes 7 respectively. The third electric valve 5, the fourth electric valve 6 and the temperature sensor are all electrically connected to the PLC control panel. The overflow pipe 103 is connected to the water storage tank 1 (in order to prevent backflow of water overflowing into the first collection tank 8, a one-way valve 104 is installed on the overflow pipe 103, which only allows water to flow out from right to left and not into the tank). The first collection box 8 is fixed on the water storage tank 1 and connected to the overflow pipe 103. The first collection box 8 is equipped with a first suction pump 9 that is electrically connected to the PLC control panel and connected to the bottom of the inside of the first collection box 8. A transparent observation window 105 is installed on the water storage tank 1; The first liquid level sensor 203 is installed inside the phenol storage tank 2; The second collection box 10 is connected to the first discharge pipe 101 and the second discharge pipe 201, and the second collection box 10 is equipped with a second suction pump 11 that is electrically connected to the PLC control panel and communicates with the bottom of the interior of the second collection box 10.

[0012] In order to automatically transfer the materials in the first collection tank 8 and the second collection tank 10 without having to keep the suction pump running all the time, the above embodiment is further optimized by installing a second liquid level sensor and a third liquid level sensor electrically connected to the PLC control panel in the first collection tank 8 and the second collection tank 10, respectively. Specifically, the first liquid level sensor 203, the second liquid level sensor and the third liquid level sensor are all non-contact liquid level sensors (the second liquid level sensor and the third liquid level sensor are not shown in the figure).

[0013] To reduce the impact of adding new material (a mixture of water and dichlorophenol) to water storage tank 1 on the already stored and stratified material, further optimizations to the above-described embodiments are made, such as... Figure 2 As shown, a porous buffer mesh frame 12 with a polytetrafluoroethylene hydrophobic coating is provided inside the water storage tank 1, and the porous buffer mesh frame 12 is higher than the overflow pipe 103. It should be noted that the first electric valve 102, the second electric valve 202, the first liquid level sensor 203, the third electric valve 5, the fourth electric valve 6, the first suction pump 9, and the second suction pump 11 are all electrically connected to the PLC control panel, which is shown in the figure but not labeled.

[0014] The working process of this utility model: When the temperature sensor detects that the heating temperature inside the negative pressure distillation vessel has reached the preset first temperature range, the temperature sensor sends a feedback signal to the PLC control panel. The PLC control panel then controls the third electric valve 5 to open and the fourth electric valve 6 to close. The condensed water can then be introduced into the water storage tank 1. As the temperature continues to rise, all the low-boiling-point water vapor flows into the distillation column and condenses into liquid before being discharged (specifically through a condenser). In the later stages, a small amount of dichlorophenol gas will be mixed in with the water vapor. Therefore, the water in the water storage tank 1 contains a small amount of dichlorophenol and its isomers. When the temperature sensor detects that the heating temperature inside the negative pressure distillation vessel has reached the preset second temperature range, the third electric valve 5 is closed and the fourth electric valve 6 is opened. Subsequently, the condensed and liquefied dichlorophenol and its isomers can be discharged into the phenol storage tank 2. When the heating temperature is about to exceed the second temperature range, stop the negative pressure distillation. Then, complete one round of distillation and rectification. Then, discharge the high-boiling-point substances from the bottom of the negative pressure distillation vessel. Then, following the above process, a new round of distillation and rectification can begin. During the continuous distillation and rectification process, layers are formed in the water storage tank 1, with dichlorophenol in the lower layer and water in the upper layer. The water in the upper layer can be slowly discharged into the first collection tank 8 through the overflow pipe 103. When the highest liquid level of dichlorophenol is about to reach the height of the overflow pipe 103 when viewed from the outside through the transparent observation window 105 (the water and dichlorophenol are distinguished by color), the feeding is stopped. Then, the first electric valve 102 is opened by controlling the PLC control panel to collect dichlorophenol into the second collection tank 10. When the highest liquid level of dichlorophenol is not visible when viewed through the transparent observation window 105, the discharge is stopped immediately (the first electric valve 102 is closed by manually operating the PLC control panel) and a new round of layered collection can begin. Meanwhile, as dichlorophenol is introduced into the phenol storage tank 2 in multiple rounds, the first liquid level sensor 203 can detect the liquid level of dichlorophenol in real time. When the liquid level in the phenol storage tank 2 reaches the preset upper limit liquid level, the non-contact liquid level sensor sends a feedback signal to the PLC control panel, and then the PLC control panel controls the second electric valve 202 to open so that dichlorophenol can be introduced into the second collection tank 10. Finally, when the liquid level in the first collection tank 8 or the second collection tank 10 reaches the preset upper limit liquid level range, the second liquid level sensor / third liquid level sensor will then send a signal to the PLC control panel. The PLC control panel will then control the corresponding first suction pump 9 / second suction pump 11 to work, thereby completing the directional transfer of materials for subsequent processing. As a result, the material in the secondary evaporation water storage tank 1 is no longer needed. Water and dichlorophenol are separated by physical means. At the same time, the discharge of water / dichlorophenol into the water storage tank 1 / phenol storage tank 2 is monitored in real time by a temperature sensor and the valves are automatically switched. Thus, the distillation and purification process for crude phenol is optimized and improved.

[0015] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The descriptions of the above embodiments and specifications are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of protection claimed by this utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A phenol distillation apparatus for the production of dicamba, comprising a water storage tank (1), a phenol storage tank (2), a negative pressure distillation vessel, a distillation column connected to a vapor phase pipeline of the negative pressure distillation vessel, and a conveying pipe (3) connected to an input pipeline of the distillation column, wherein the water storage tank (1) is provided with a first discharge pipe (101) and a first electric valve (102) is provided on the first discharge pipe (101), the phenol storage tank (2) is provided with a second discharge pipe (201) and a second electric valve (202) is provided on the second discharge pipe (201), and a temperature sensor is provided inside the negative pressure distillation vessel, characterized in that, It also includes a tee pipe (4). One of the pipes of the three-way pipe (4) is connected to the delivery pipe (3). The remaining two pipes of the three-way pipe (4) are respectively equipped with a third electric valve (5) and a fourth electric valve (6) and are connected to the water storage tank (1) and the phenol storage tank (2) through two flow pipes (7). The third electric valve (5), the fourth electric valve (6) and the temperature sensor are all electrically connected to the PLC control panel. The overflow pipe (103) is connected to the water storage tank (1); The first collection box (8) is fixed on the water storage tank (1) and connected to the overflow pipe (103). The first collection box (8) is equipped with a first suction pump (9) that is electrically connected to the PLC control panel and connected to the bottom of the inside of the first collection box (8). A transparent observation window (105) is provided on the water storage tank (1); The first liquid level sensor (203) is installed inside the phenol storage tank (2) and is electrically connected to the PLC control panel; The second collection box (10) is connected to the first discharge pipe (101) and the second discharge pipe (201), and the second collection box (10) is equipped with a second suction pump (11) that is electrically connected to the PLC control panel and connected to the bottom of the interior of the second collection box (10).

2. The phenol distillation equipment for dicamba production according to claim 1, characterized in that, The first collection tank (8) and the second collection tank (10) are respectively equipped with a second liquid level sensor and a third liquid level sensor that are electrically connected to the PLC control panel.

3. The phenol distillation equipment for dicamba production according to claim 1, characterized in that, The water storage tank (1) is provided with a porous buffer mesh frame (12) with a polytetrafluoroethylene hydrophobic coating on its surface, and the porous buffer mesh frame (12) is higher than the overflow pipe (103).

4. The phenol distillation equipment for dicamba production according to claim 1, characterized in that, The overflow pipe (103) is equipped with a one-way valve (104) that allows only outflow from right to left and not inflow.

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