A pressure control device for a distillation column

Abstract

This invention discloses a distillation column pressure control device, belonging to the technical field of distillation column top pressure control. It includes a distillation mechanism, a condensation system, a reflux mechanism, and a nitrogen pressure stabilization system. The distillation mechanism includes a distillation column and pipelines, with the column connected to the pipelines. The reflux mechanism includes a reflux tank; gas flows from the top of the distillation column through the pipeline into the condensation system, where it is condensed and liquefied into liquid, flowing into the reflux tank, and then from the reflux tank back into the top of the distillation column. The nitrogen pressure stabilization system is directly connected to the distillation column through pipelines, supplying nitrogen to the top of the column. This invention has the advantages of rapid control of the distillation column top pressure, avoidance of gas reflux, fast pressure stabilization, and small pressure fluctuation range.

Description

Technical Field

[0001] This invention belongs to the field of distillation column top pressure control technology, and more specifically relates to a distillation column pressure control device. Background Technology

[0002] With the rapid development of industrial production, distillation columns, as devices that can separate gas and liquid phases by utilizing the different volatility of mixtures, have been widely used. The top pressure of the distillation column needs to be maintained within a certain range to ensure the continuous and efficient progress of the reaction. In the existing technology, condensers are usually used to condense and liquefy the collected gas phase, and then collect it into a reflux tank. When the pressure at the top of the column changes, the liquid phase in the reflux tank is used to stabilize the pressure. However, the pressure stabilization speed is slow, and the condenser cannot guarantee that all gas phases will be liquefied. Gas phase products will remain in the reflux tank, leading to gas reflux and large pressure fluctuations.

[0003] Therefore, how to provide a pressure control device for a distillation column is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a distillation column pressure control device, which has the advantages of quickly controlling the pressure at the top of the distillation column, avoiding gas backflow, fast pressure stabilization, and small pressure fluctuation range.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A distillation column pressure control device includes: a distillation mechanism, a condensation system, a reflux mechanism, and a nitrogen pressure stabilization system; the distillation mechanism includes a distillation column and pipelines, the distillation column being connected to the pipelines; the reflux mechanism includes a reflux tank, gas flows out from the top of the distillation column through the pipeline into the condensation system, is condensed and liquefied by the condensation system into liquid, flows into the reflux tank, and then flows from the reflux tank into the top of the distillation column; the nitrogen pressure stabilization system is directly connected to the distillation column through pipelines, supplying nitrogen to the top of the distillation column.

[0007] Furthermore, the condensation system includes a primary condenser, a secondary condenser, a tertiary condenser, and a condenser connecting valve; one end of the primary condenser is connected to the distillation column via a pipe, and the other end is connected to one end of the secondary condenser via a pipe; the other end of the secondary condenser is connected to one end of the tertiary condenser via a pipe; the primary, secondary, and tertiary condensers are all connected to the reflux tank via pipes; and the condenser connecting valve is installed on the pipe between the distillation column and the primary condenser.

[0008] Furthermore, the reflux mechanism also includes a reflux valve and a reflux pump, both of which are installed on the pipeline between the distillation column and the reflux tank.

[0009] Furthermore, the nitrogen pressure stabilization system includes a nitrogen charging valve and a nitrogen pressure stabilization tank; the nitrogen pressure stabilization tank is connected to the distillation column via a pipeline, and the nitrogen charging valve is installed on the pipeline between the distillation column and the nitrogen pressure stabilization tank.

[0010] Furthermore, the nitrogen pressure stabilization system also includes a U-shaped pipe, a hollow sphere, and a gas screen; both ends of the U-shaped pipe are connected to the pipe between the distillation column and the nitrogen pressure stabilization tank; the gas screen is installed inside the pipe between the distillation column and the nitrogen pressure stabilization tank, located on both sides of the pipe opening at one end of the U-shaped pipe, and the gas screen has through holes; the hollow sphere is placed in the pipe between the distillation column and the nitrogen pressure stabilization tank, located between two gas screens, and the diameter of the hollow sphere is the same as the diameter of the pipe.

[0011] The beneficial effects of this invention are as follows:

[0012] This invention has a simple structure and is easy to use. The gas phase generated at the top of the distillation column enters the first-stage condenser, the second-stage condenser, and the third-stage condenser sequentially through pipelines. Each stage of the condenser is connected to a reflux tank. The liquid phase generated by each stage of the condenser flows into the reflux tank respectively. Through three-stage condensation, the gas phase is prevented from entering the reflux tank and causing gas backflow. Part of the liquid phase in the reflux tank can be taken out, and the other part can be used to stabilize the pressure at the top of the distillation column. When the pressure at the top of the distillation column changes, the reflux valve and reflux pump are opened to allow the liquid phase to flow back to the top of the distillation column to stabilize the pressure. Secondly, this invention also incorporates a nitrogen pressure stabilization system. As long as the pressure in the nitrogen pressure stabilization tank is the same as the required pressure at the top of the distillation column, the nitrogen charging valve is opened. When the pressure at the top of the distillation column is less than the pressure in the nitrogen pressure stabilization tank, the hollow sphere moves to the right, opening the U-shaped pipe and allowing nitrogen to enter the top of the distillation column, increasing the internal pressure. When the pressure at the top of the distillation column is greater than the pressure in the nitrogen pressure stabilization tank, the hollow sphere moves to the left, closing the U-shaped pipe, and the gas phase at the top of the distillation column is discharged through the condenser, maintaining pressure stability. Therefore, this invention has the advantages of rapid control of the distillation column top pressure, prevention of gas backflow, fast pressure stabilization, and small pressure fluctuation range. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the U-shaped pipe of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of the gas screen of the present invention.

[0017] In the figure:

[0018] 1-Distillation column; 2-First-stage condenser; 3-Second-stage condenser; 4-Third-stage condenser; 5-Reflux tank; 6-Condenser connecting valve; 7-Reflux valve; 8-Reflux pump; 9-Nitrogen charging valve; 10-Nitrogen pressure stabilizing tank; 11-U-shaped pipe; 12-Hollow sphere; 13-Gas screen. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see the appendix Figure 1-3 This invention provides a distillation column pressure control device, including a distillation mechanism, a condensation system, a reflux mechanism, and a nitrogen pressure stabilization system. The distillation mechanism includes a distillation column 1 and a pipeline, with the distillation column 1 connected to the pipeline. The reflux mechanism includes a reflux tank 5, through which gas flows from the top of the distillation column 1 through the pipeline into the condensation system, where it is condensed and liquefied into liquid and flows into the reflux tank 5, and then from the reflux tank 5 into the top of the distillation column 1. The nitrogen pressure stabilization system is directly connected to the distillation column 1 through a pipeline, supplying nitrogen to the top of the distillation column 1.

[0021] The condensation system includes a primary condenser 2, a secondary condenser 3, a tertiary condenser 4, and a condenser connecting valve 6. One end of the primary condenser 2 is connected to the distillation column 1 via a pipe, and the other end is connected to one end of the secondary condenser 3 via a pipe. The other end of the secondary condenser 3 is connected to one end of the tertiary condenser 4 via a pipe. The primary condenser 2, secondary condenser 3, and tertiary condenser 4 are all connected to the reflux tank 5 via pipes. The condenser connecting valve 6 is installed on the pipe between the distillation column 1 and the primary condenser 2. When the gas flow rate is low, connecting valves can be installed between each stage of the condenser and closed, allowing the gas phase to enter the reflux tank 5 only after passing through the primary or secondary condenser, saving energy. When the gas flow rate is high, all connecting valves are opened for condensation.

[0022] The reflux mechanism further includes a reflux valve 7 and a reflux pump 8, both of which are installed on the pipeline between the distillation column 1 and the reflux tank 5. The nitrogen pressure stabilization system includes a nitrogen charging valve 9 and a nitrogen pressure stabilization tank 10; the nitrogen pressure stabilization tank 10 is connected to the distillation column 1 via a pipeline, and the nitrogen charging valve 9 is installed on the pipeline between the distillation column 1 and the nitrogen pressure stabilization tank 10. One end of the nitrogen pressure stabilization tank 10 is externally connected to nitrogen gas to maintain a constant pressure at the pressure required at the top of the distillation column 1.

[0023] The nitrogen pressure stabilization system also includes a U-shaped pipe 11, a hollow sphere 12, and a gas screen 13. Both ends of the U-shaped pipe 11 are connected to the pipeline between the distillation column 1 and the nitrogen pressure stabilization tank 10. The gas screen 13 is installed inside the pipeline between the distillation column 1 and the nitrogen pressure stabilization tank 10, located on both sides of one end of the U-shaped pipe 11. The gas screen 13 has through holes to ensure gas flow. Pressure changes can cause the gas to push the hollow sphere 12. The hollow sphere 12 is placed in the pipeline between the distillation column 1 and the nitrogen pressure stabilization tank 10, located between two gas screens 13. The diameter of the hollow sphere 12 is the same as the diameter of the pipeline. On the one hand, it prevents gas from overflowing. On the other hand, when nitrogen pressure stabilization is not required, it prevents the gas phase in the distillation column 1 from flowing into the nitrogen pressure stabilization tank 10, causing pressure changes in the nitrogen pressure stabilization tank 10.

[0024] This invention has a simple structure and is easy to use. In operation, the condenser connecting valve 6 is first opened. The gas phase generated at the top of distillation column 1 enters sequentially through pipelines into the first-stage condenser 2, the second-stage condenser 3, and the third-stage condenser 4. Each condenser is connected to a reflux tank 5. The liquid phase generated by each condenser flows into the reflux tank 5, while the gas phase flows into the next stage condenser. Through three-stage condensation, the gas phase is prevented from entering the reflux tank 5, thus avoiding gas backflow. A portion of the liquid phase in the reflux tank 5 can be removed, while the remaining portion can be used to stabilize the pressure at the top of distillation column 1. When the pressure at the top of distillation column 1 changes, the reflux valve 7 and the reflux pump 8 are opened to allow the liquid phase to flow back to the top of distillation column 1, stabilizing the pressure. Secondly, this invention also includes a nitrogen pressure stabilization system. As long as the pressure in the nitrogen pressure stabilization tank 10 is the same as the required pressure at the top of the distillation column 1, the nitrogen charging valve 9 is opened. When the pressure at the top of the distillation column 1 is less than the pressure in the nitrogen pressure stabilization tank 10, the hollow ball 12 moves to the right, opening the U-shaped pipe 11, allowing nitrogen to enter the top of the distillation column 1 and increasing the internal pressure. When the pressure at the top of the distillation column 1 is greater than the pressure in the nitrogen pressure stabilization tank 10, the hollow ball 12 moves to the left, closing the U-shaped pipe 11, and the gas phase at the top of the distillation column 1 is discharged through the condenser, maintaining pressure stability. In this invention, the nitrogen pressure stabilization system and the liquid phase reflux pressure stabilization in the reflux tank 5 can work simultaneously, thus giving this invention the advantages of rapid control of the pressure at the top of the distillation column 1, avoidance of gas reflux, fast pressure stabilization speed, and small pressure fluctuation range.

[0025] The embodiments in this specification are described in a progressive manner. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple. For relevant parts, please refer to the description in the method section.

[0026] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pressure control device for a rectification column, characterized by comprising: The application relates to a distillation device for producing high-purity alcohol, which comprises a distillation mechanism, a condensing system, a reflux mechanism and a nitrogen pressure stabilizing system. The condensing system comprises a first-stage condenser (2), a second-stage condenser (3), a third-stage condenser (4) and a condenser communication valve (6); one end of the first-stage condenser (2) is connected with the distillation tower (1) through a pipeline, the other end is connected with one end of the second-stage condenser (3) through a pipeline, the other end of the second-stage condenser (3) is connected with one end of the third-stage condenser (4) through a pipeline, the first-stage condenser (2), the second-stage condenser (3) and the third-stage condenser (4) are connected with the reflux tank (5) through pipelines, and the condenser communication valve (6) is installed on the pipeline between the distillation tower (1) and the first-stage condenser (2). The nitrogen pressure stabilizing system comprises a nitrogen charging valve (9) and a nitrogen pressure stabilizing tank (10); the nitrogen pressure stabilizing tank (10) is connected with the distillation tower (1) through a pipeline, and the nitrogen charging valve (9) is installed on the pipeline between the distillation tower (1) and the nitrogen pressure stabilizing tank (10). The nitrogen pressure stabilizing system further comprises a U-shaped pipeline (11), a hollow ball (12) and a gas screen (13); the two ends of the U-shaped pipeline (11) are connected with the pipeline between the distillation tower (1) and the nitrogen pressure stabilizing tank (10), the gas screen (13) is installed in the pipeline between the distillation tower (1) and the nitrogen pressure stabilizing tank (10) and is located on the two sides of the pipeline opening at one end of the U-shaped pipeline (11), the gas screen (13) is provided with through holes, the hollow ball (12) is placed in the pipeline between the distillation tower (1) and the nitrogen pressure stabilizing tank (10) and is located between the two gas screens (13), and the diameter of the hollow ball (12) is the same as the diameter of the pipeline. The reflux mechanism further comprises a reflux valve (7) and a reflux pump (8), and the reflux valve (7) and the reflux pump (8) are installed on the pipeline between the distillation tower (1) and the reflux tank (5).

2. A pressure control device for a distillation column as defined in claim 1, characterized in that ​

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