Continuous rectification device

Abstract

The utility model discloses a continuous rectification device which comprises a falling film evaporator, the output end of the falling film evaporator is connected with a falling film separation tank, the output end of the falling film separation tank is connected with a rectification tower, the output end of the rectification tower is connected with a condenser, the output end of the condenser is connected with a front fraction receiving tank, and the rectification tower is further connected with an extraction pump. The output end of the extraction pump is connected with an extraction condenser, the output end of the extraction condenser is connected with a product receiving tank, and the falling film separation tank is further connected with a rear fraction receiving tank. According to the utility model, rectification can be carried out according to boiling points of different materials, so that the storage time of the materials at a high temperature is shortened, and the polymerization and decomposition of products at the high temperature are reduced, thereby improving the yield of the products, reducing the generation amount of hazardous wastes, reducing the unit consumption of the products, reducing the safety risk and stabilizing the content of the products.

Description

Technical Field

[0001] The utility model belongs to the technical field of continuous distillation, and particularly relates to a continuous distillation device. Background Technique

[0002] In the production fields of industries such as chemical engineering and medicine, many materials are purified through distillation. However, different material properties lead to different selected distillation methods. For materials that polymerize and decompose at high temperatures, various distillation methods will result in different yields and products with low contents.

[0003] Chinese Patent with publication number CN219167739U discloses a new type of distillation device, including a distillation kettle. The discharge end of the distillation kettle is connected to a distillation column through a distillation feed pipe. The bottom of the distillation column is connected to the distillation kettle through a first distillation return pipe. The upper part of the distillation column is connected to a fraction receiving tank and a finished product receiving tank respectively through a distillation discharge pipe. A gate valve for controlling whether the finished product flows into the fraction receiving tank and the finished product receiving tank is provided on the distillation discharge pipe. Its structural feature is that the bottom of the distillation column is connected to a column section liquid receiving tank through a second distillation return pipe. Gate valves for controlling whether to flow into the distillation kettle and the column section liquid receiving tank are provided on the first distillation return pipe and the second distillation return pipe. A sampling section is provided on the distillation discharge pipe.

[0004] The utility model reduces the waste of qualified products, improves the qualification rate of products, and reduces the energy waste of distillation.

[0005] During the above process flow in the runoff process, the material is cooked in the distillation kettle for a long time, which will cause the material to polymerize, generate impurities, and reduce the yield of the product for materials that polymerize at high temperatures for a long time. Therefore, there is an urgent need for a continuous distillation device to solve the above problems. Content of the Utility Model

[0006] Aiming at the problems raised in the above background technique, the purpose of the utility model is to provide a continuous distillation device.

[0007] To achieve the above technical purpose, the technical scheme adopted by the utility model is as follows:

[0008] A continuous distillation device includes a falling film evaporator. The output end of the falling film evaporator is connected to a falling film separation tank. The output end of the falling film separation tank is connected to a distillation column. The output end of the distillation column is connected to a condenser. The output end of the condenser is connected to a pre-fraction receiving tank. The distillation column is also connected to a withdrawal pump. The output end of the withdrawal pump is connected to a withdrawal condenser. The output end of the withdrawal condenser is connected to a product receiving tank. The falling film separation tank is also connected to a post-fraction receiving tank.

[0009] Further limitation: A flow meter and a feed regulating valve are connected to the input end of the falling film evaporator. Such a structural design controls the feed rate of the material and realizes uniform feeding.

[0010] Further limitation: The falling film evaporator is connected with a steam regulating valve for the falling film evaporator and a thermometer at the outlet of the falling film evaporator. Such a structural design can control the amount of steam, so that all the product and the pre-fraction reach the boiling point and vaporize.

[0011] Further limitation: A liquid-phase passing regulating valve and a liquid level gauge for the falling film separation tank are further provided between the falling film separation tank and the post-fraction receiving tank. Such a structural design can control the liquid level of the falling film separation tank.

[0012] Further limitation: The rectifying column is connected with a reboiler, a steam regulating valve and a steam flow meter. Such a structural design realizes stable control of the steam.

[0013] Further limitation: The condenser is connected with a reflux regulating valve and a reflux flow meter. Such a structural design can control the reflux amount.

[0014] Further limitation: The condenser is further connected with a pre-fraction extraction regulating valve and a pre-fraction extraction flow meter. Such a structural design can control the extraction amount.

[0015] Further limitation: An extraction regulating valve and a bottom liquid level gauge are further provided between the extraction pump and the extraction condenser. Such a structural design can control the product extraction amount.

[0016] The beneficial effects of the present utility model are as follows: The present utility model can carry out rectification according to the boiling points of different materials, reduce the storage time of the materials at high temperature, reduce the polymerization and decomposition of the products at high temperature, thereby improving the product yield, reducing the generation amount of hazardous waste, reducing the unit consumption of the products, reducing the safety risk and stabilizing the product content. Description of the Drawings

[0017] The present utility model can be further illustrated by the non-limiting embodiments given in the drawings;

[0018] Figure 1 It is a structural schematic diagram of a continuous rectification device according to an embodiment of the present utility model;

[0019] The main element symbols are explained as follows:

[0020] Flowmeter 1, feed regulating valve 2, falling film evaporator 3, falling film evaporator steam regulating valve 4, thermometer at the outlet of the falling film evaporator 5, falling film separation tank 6, regulating valve 7, liquid level gauge of the falling film separation tank 8, steam flowmeter 10, steam regulating valve 11, reboiler 12, distillation column 13, reflux flowmeter 14, reflux regulating valve 15, pre-fraction product flowmeter 16, pre-fraction product regulating valve 17, condenser 18, bottom liquid level gauge 19, product extraction regulating valve 20, product extraction pump 21, product extraction condenser 22, product receiving tank 23, pre-fraction receiving tank 24, post-fraction receiving tank 25. Detailed implementation mode

[0021] In order to enable those skilled in the art to better understand the present utility model, the technical solution of the present utility model will be further described below in conjunction with the drawings and embodiments.

[0022] As Figure 1 shown, in a continuous distillation device of the present utility model, the output end of the falling film evaporator 3 is connected to a falling film separation tank 6, the output end of the falling film separation tank 6 is connected to a distillation column 13, the output end of the distillation column 13 is connected to a condenser 18, the output end of the condenser 18 is connected to a pre-fraction receiving tank 24, the distillation column 13 is also connected to a product extraction pump 21, the output end of the product extraction pump 21 is connected to a product extraction condenser 22, the output end of the product extraction condenser 22 is connected to a product receiving tank 23, and the falling film separation tank 6 is also connected to a post-fraction receiving tank 25.

[0023] Preferably, the input end of the falling film evaporator 3 is connected to a flowmeter 1 and a feed regulating valve 2. Such a structural design controls the feed rate of the material and realizes uniform feeding. In fact, other structural shapes of the feed control of the falling film evaporator 3 can also be considered according to specific situations.

[0024] Preferably, the falling film evaporator 3 is connected to a falling film evaporator steam regulating valve 4 and a thermometer at the outlet of the falling film evaporator 5. Such a structural design can control the size of the steam and enable all products and pre-fractions to reach the boiling point and vaporize. In fact, other steam control structural shapes of the falling film evaporator 3 can also be considered according to specific situations.

[0025] Preferably, a liquid phase passing through a regulating valve 7 and a liquid level gauge 8 of the falling film separation tank are also provided between the falling film separation tank 6 and the post-fraction receiving tank 25. Such a structural design can control the liquid level of the falling film separation tank 6. In fact, other liquid level control structural shapes of the falling film separation tank 6 can also be considered according to specific situations.

[0026] Preferably, the distillation column 13 is connected to a reboiler 12, a steam regulating valve 11 and a steam flowmeter 10. Such a structural design realizes the stable control of steam. In fact, other structural shapes for stably controlling steam of the distillation column 13 can also be considered according to specific situations.

[0027] Preferably, the condenser 18 is connected with a reflux regulating valve 15 and a reflux flowmeter 14. Such a structural design can control the reflux amount. In fact, other reflux control structural shapes of the condenser 18 can also be considered according to specific situations.

[0028] Preferably, the condenser 18 is also connected with a fore-fraction extraction regulating valve 17 and a fore-fraction extraction flowmeter 16. Such a structural design can control the extraction amount. In fact, other extraction control structural shapes of the condenser 18 can also be considered according to specific situations.

[0029] Preferably, a product extraction regulating valve 20 and a column bottom level gauge 19 are also provided between the extraction pump 21 and the extraction condenser 22. Such a structural design can control the product extraction amount. In fact, other extraction control structural shapes of the extraction condenser 22 can also be considered according to specific situations.

[0030] In this embodiment, the falling film evaporator steam regulating valve 4 of the falling film evaporator 3 is opened, the feed pump is started, and the feed amount of the material is controlled by interlocking the flowmeter 1 through the feed regulating valve 2 to achieve uniform feeding. The falling film evaporator steam regulating valve 4 is controlled according to the temperature of the thermometer 5 at the outlet of the falling film evaporator, so that all the products and fore-fractions reach the boiling point and vaporize. After passing through the falling film separation tank 6, the material is subjected to gas-liquid separation. The products and fore-fractions in the gas phase enter the rectifying column 13 for rectification. The liquid phase is interlocked through the regulating valve 7 and the falling film separation tank level gauge 8 to control the level of the falling film separation tank 6. The after-fractions are extracted to the after-fraction receiving tank 25 to control the content of the products in the after-fractions to be lower than a certain value, so that the products are vaporized as much as possible. The gas-phase material entering the rectifying column 13 is interlocked to control the amount of steam through the reboiler 12, the steam regulating valve 11 and the steam flowmeter 10 to achieve stable control of the steam. The evaporated fore-fractions enter the condenser 18 for cooling. The condensed liquid is interlocked to control the reflux amount through the reflux regulating valve 15 and the reflux flowmeter 14, and the extraction amount is interlocked to control through the fore-fraction extraction regulating valve 17 and the fore-fraction extraction flowmeter 16. The fore-fractions are received in the fore-fraction receiving tank 24, so as to achieve a stable reflux ratio, and make the rectified products reach the qualified content. The products of the rectifying column 13 are pumped into the extraction condenser 22 by the extraction pump 21 and enter the product receiving tank 23 after cooling. The product extraction regulating valve 20 and the column bottom level gauge 19 are interlocked to control the product extraction amount.

[0031] The above embodiments only exemplarily illustrate the principles and effects of the present invention, rather than limiting the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A continuous distillation device, characterized in that: The invention comprises a falling film evaporator (3), wherein the output end of the falling film evaporator (3) is connected to a falling film separation tank (6), the output end of the falling film separation tank (6) is connected to a distillation tower (13), the output end of the distillation tower (13) is connected to a condenser (18), the output end of the condenser (18) is connected to a front fraction receiving tank (24), the distillation tower (13) is also connected to a production pump (21), the output end of the production pump (21) is connected to a production condenser (22), the output end of the production condenser (22) is connected to a product receiving tank (23), and the falling film separation tank (6) is also connected to a rear fraction receiving tank (25).

2. A continuous distillation device according to claim 1, characterized in that: The input end of the falling film evaporator (3) is connected to a flow meter (1) and a feed regulating valve (2).

3. A continuous distillation device according to claim 2, characterized in that: The falling film evaporator (3) is connected to a falling film evaporator steam regulating valve (4) and a falling film evaporator outlet thermometer (5).

4. A continuous distillation device according to claim 3, characterized in that: A liquid phase passage regulating valve (7) and a falling film separation tank liquid level meter (8) are also provided between the falling film separation tank (6) and the post-fraction receiving tank (25).

5. A continuous distillation device according to claim 4, characterized in that: The distillation tower (13) is connected to a reboiler (12), a steam regulating valve (11) and a steam flow meter (10).

6. A continuous distillation device according to claim 5, characterized in that: The condenser (18) is connected to a reflux regulating valve (15) and a reflux flow meter (14).

7. A continuous distillation device according to claim 6, characterized in that: The condenser (18) is also connected to a fore fraction extraction regulating valve (17) and a fore fraction extraction flowmeter (16).

8. A continuous distillation device according to claim 7, characterized in that: An extraction regulating valve (20) and a bottom liquid level gauge (19) are also provided between the extraction pump (21) and the extraction condenser (22).

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