A production system for changing intermittent rectification to continuous rectification

Abstract

The utility model discloses an intermittent rectification production system of continuous rectification, including feed inlet part, rectifying kettle, discharge part and condensing part, be provided with the predetermined volume in rectifying kettle, feed inlet part is connected with rectifying kettle, and condensing part is connected with the steam export end of rectifying kettle, and the discharge part is connected with the steam export end of rectifying kettle and the bottom discharge end of rectifying kettle respectively, and this scheme can realize the switching between intermittent rectification and continuous rectification operation fast, can satisfy the large -batch continuous production also can satisfy the intermittent production of small -batch, many kinds of products, and it is a kind of fast, efficient, low -cost rectification system.

Description

Technical Field

[0001] This utility model relates to the field of chemical production technology, and in particular to a production system for converting intermittent distillation into continuous distillation. Background Technology

[0002] Distillation is a common material separation and purification method used in chemical production. It utilizes the difference in relative volatility of liquid mixtures; during the gas-liquid two-phase mass and heat transfer process, substances with higher relative volatility continuously accumulate at the top of the column, while substances with lower relative volatility continuously accumulate at the bottom, thus achieving separation of the mixture. Common distillation operations are divided into batch distillation and continuous distillation. In batch distillation, the material is injected all at once, yielding the fore-distillate, transition fraction, and product at the top, and the heavy component at the bottom. Because the operation is batch-based, production efficiency is low and labor intensity is high; this method is suitable for small-batch, multi-variety product purification and is relatively flexible. In contrast, continuous distillation involves a continuous input of raw materials and continuous extraction of the corresponding products at the top and bottom of the column. The operation is continuous, therefore, efficiency is high, overall cost is low, and it is suitable for large-scale production.

[0003] How to use a single system to quickly switch between small-batch, multi-variety intermittent production operations and continuous flow production operations, thereby improving efficiency and reducing production and equipment investment costs, has always been a difficult problem for the industry. Utility Model Content

[0004] The purpose of this invention is to provide a production system for converting batch distillation to continuous distillation, addressing the aforementioned shortcomings and solving the problem that existing technologies cannot enable rapid switching between batch distillation and continuous distillation through appropriate devices.

[0005] This utility model is achieved through the following solution:

[0006] A production system for converting intermittent distillation to continuous distillation includes a feed section, a distillation vessel, a discharge section, and a condensation section; the distillation vessel has a predetermined volume; the feed section is connected to the distillation vessel, the condensation section is connected to the steam outlet of the distillation vessel, and the discharge section is connected to both the steam outlet of the distillation vessel and the bottom discharge end of the distillation vessel.

[0007] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, the feed section includes a storage section, a feed pump, and a first flow meter; the feed pump is connected to the storage section and the distillation vessel through pipelines, and the first flow meter is installed on the pipeline connecting the feed pump and the distillation vessel.

[0008] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, the distillation vessel includes a vessel body, a distillation column, and a reflux pipeline. The distillation column is located at the top of the vessel body and is connected to the condenser section through the reflux pipeline.

[0009] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, the condensation section includes a first condensation component, a first gas-liquid separator, and a second condensation component; the first condensation component and the first gas-liquid separator are disposed on the reflux pipeline, the first gas-liquid separator is disposed at the bottom of the first condensation component, and a branch pipeline is also connected to the first gas-liquid separator; the second condensation component is disposed on the branch pipeline; and a first collection pipe is also disposed on the reflux pipeline.

[0010] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, the end of the branch pipeline is further provided with a second collection pipe, a second gas-liquid separator, and a waste gas discharge pipe; the second condensation assembly is provided on the branch pipeline, before the second gas-liquid separator, and the second collection pipe and the waste gas discharge pipe are respectively connected to the liquid outlet and gas outlet of the second gas-liquid separator.

[0011] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, the discharge section includes a discharge pump, a discharge pipe, and a collection tank; the discharge pump is connected to the liquid storage port of the vessel body through a pipeline, and the collection tank is connected to the discharge pump through the discharge pipe.

[0012] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, a second flow meter is installed on the reflux pipeline, a third flow meter is installed on the first extraction pipe, a fourth flow meter is installed on the second extraction pipe, and a fifth flow meter is installed on the discharge pipe.

[0013] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, a manifold is provided at the end of the first and second extraction pipes, and a first cooler is provided on the manifold.

[0014] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, a second cooler is provided on the discharge pipe.

[0015] Based on the structure of the above-mentioned production system for converting intermittent distillation to continuous distillation, a heat source system is provided in the vessel body, which is a steam system, a heat transfer oil system, or an electric heating system.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of this utility model are:

[0017] 1. The distillation vessel in this scheme is equipped with a predetermined volume, which can be used as a container for batch distillation of liquids, enabling the entire system to achieve both batch and continuous distillation. When continuous distillation is required, the material enters from the feed section, is heated in the distillation vessel, and is condensed through the condenser at the steam outlet to achieve liquefaction and reflux of the material, and is then discharged through the discharge section. When batch distillation is required, the material is fed into the distillation vessel in batches from the feed section, the feed section and discharge section are closed, the distillation vessel is then heated, and the material is condensed through the condenser at the steam outlet to achieve liquefaction and reflux of the material, and finally discharged through the discharge section.

[0018] 2. This solution can quickly switch between batch and continuous distillation operations, meeting both large-scale continuous production and small-batch, multi-variety batch production needs. It is a fast, efficient, and low-cost distillation system. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0020] Figure Descriptions: 1. Feed section; 2. Distillation vessel; 3. Discharge section; 4. Condensation section; 11. Storage section; 12. Feed pump; 13. First flow meter; 14. Second flow meter; 15. Third flow meter; 16. Fourth flow meter; 17. Fifth flow meter; 21. Vessel body; 22. Distillation column; 23. Reflux line; 31. Discharge pump; 32. Discharge pipe; 33. Collection tank; 34. Second cooler; 41. First condensation assembly; 42. First gas-liquid separator; 43. Second condensation assembly; 44. Diversion line; 45. First outlet pipe; 46. Manifold; 47. First cooler; 441. Second outlet pipe; 442. Second gas-liquid separator; 443. Waste gas discharge pipe. Detailed Implementation

[0021] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0022] Any feature disclosed in this specification (including any appended claims and abstract) may be replaced by other equivalent or similar features, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0023] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature.

[0025] Example 1

[0026] like Figure 1 As shown, this utility model provides a technical solution:

[0027] A production system for converting intermittent distillation to continuous distillation includes, but is not limited to, a feed section 1, a distillation vessel 2, a discharge section 3, and a condenser 4; the distillation vessel 2 has a predetermined volume; the feed section 1 is connected to the distillation vessel 2, the condenser 4 is connected to the steam outlet end of the distillation vessel 2, and the discharge section 3 is connected to both the steam outlet end of the distillation vessel 2 and the bottom discharge end of the distillation vessel 2.

[0028] Based on the above structure, this scheme has a predetermined volume in the distillation vessel 2, which can be used as a container for batch distillation of liquids, so that the entire system can realize both batch distillation and continuous distillation. When continuous distillation is required, the material enters from the feed section 1, and after the distillation vessel 2 is heated, it is condensed through the condenser section 4 of the steam outlet to realize the liquefaction and reflux of the material, and is discharged through the discharge section 3. When batch distillation is required, the material is fed into the distillation vessel 2 in batches from the feed section 1, the feed section and the discharge section 3 are closed, and then the distillation vessel 2 is heated and condensed through the condenser section 4 of the steam outlet to realize the liquefaction and reflux of the material, and is finally discharged through the discharge section 3.

[0029] As an example, the feeding section may include a storage section 11, a feed pump 12 and a first flow meter 13; the feed pump 12 is connected to the storage section 11 and the distillation vessel 2 through pipelines respectively, and the first flow meter 13 is installed on the pipeline connecting the feed pump 12 and the distillation vessel 2;

[0030] Based on the above structure, the feed pump 12 is used to provide power for conveying materials, and the first flow meter 13 is used to detect the total amount of material entering the entire system, so as to facilitate the dynamic control of input and output quantities for subsequent continuous distillation operations.

[0031] As an example, the distillation vessel 2 may include a vessel body 21, a distillation column 22 and a reflux line 23. The distillation column 22 is located at the top of the vessel body 21 and is connected to the condenser 4 through the reflux line 23.

[0032] Based on the above structure, the distillation vessel 2 has a certain volume to hold the material. After the distillation vessel 2 is heated, its vapor flows upward through the distillation column 22 and is finally condensed and refluxed through the condenser 4, and finally flows back into the distillation vessel 2.

[0033] As an example, the condenser 4 may include a first condenser assembly 41, a first gas-liquid separator 42, and a second condenser assembly 43; the first condenser assembly 41 and the first gas-liquid separator 42 are disposed on the return pipe 23, the first gas-liquid separator 42 is disposed at the bottom of the first condenser assembly 41, and a diversion pipe 44 is also connected to the first gas-liquid separator 42; the second condenser assembly 43 is disposed on the diversion pipe 44; and a first extraction pipe 45 is also disposed on the return pipe 23.

[0034] Based on the above structure, the heated flue gas flows through the distillation column 22 to the first condenser assembly 41, where it is continuously condensed into a liquid state. Part of the liquid medium flows through the reflux pipe 23 back to the distillation column 22 and finally to the vessel body 21; another part of the liquid medium flows out of the system through the first outlet pipe 45; while the flue gas condensed by the first condenser assembly 41 flows through the diversion pipe 44 to the second condenser assembly 43, where it is condensed and discharged.

[0035] As an example, the end of the diversion pipeline 44 is also provided with a second extraction pipe 441, a second gas-liquid separator 442 and a waste gas discharge pipe 443; the second condensation assembly 43 is provided on the diversion pipeline, before the second gas-liquid separator 442, and the second extraction pipe 441 and the waste gas discharge pipe 443 are respectively connected to the liquid outlet and the gas outlet of the second gas-liquid separator 442.

[0036] Based on the above structure, the light component flue gas is condensed again by the second condensation component 43, so that the entire material is condensed more completely, and gas-liquid separation is performed by the second gas-liquid separator 442. Unwanted waste gas is discharged from the waste gas discharge pipe, and the condensed light component is discharged from the second extraction pipe 441.

[0037] As an example, the discharge section 3 may include a discharge pump 31, a discharge pipe 32, and a collection tank 33; the discharge pump 31 is connected to the liquid storage port of the vessel body 21 through a pipe, and the collection tank 33 is connected to the discharge pump 31 through the discharge pipe 32.

[0038] Based on the above structure, the discharge pump 31 provides power for the entire material conveying process, collects the liquid medium through the collection tank 33, and uses the discharge pipe 32 to transport the liquid medium.

[0039] As an example, a second flow meter 14 is installed on the return pipe 23, a third flow meter 15 is installed on the first extraction pipe 45, a fourth flow meter 16 is installed on the second extraction pipe 441, and a fifth flow meter 17 is installed on the discharge pipe 32.

[0040] Based on the above structure, the flow rate of the liquid medium returning to the vessel body 21 is measured by the second flow meter 14, the flow rate of the liquid medium discharged from the first outlet pipe 45 is measured by the third flow meter 15, the flow rate of the liquid medium discharged from the second outlet pipe 441 is measured by the fourth flow meter 16, and the flow rate of the liquid medium discharged from the outlet pipe 32 is measured by the fifth flow meter 17. This provides data support for subsequent continuous distillation operations, i.e., the measured value of the first flow meter 13 = the measured value of the second flow meter 14 + the measured value of the third flow meter 15 + the measured value of the fourth flow meter 16 + the measured value of the fifth flow meter 17.

[0041] As an example, a manifold 46 is provided at the end of the first extraction pipe 45 and the second extraction pipe 441, and a first cooler 47 is provided on the manifold 46.

[0042] Based on the above structure, the condensed liquid medium discharged from the first extraction pipe 45 and the second extraction pipe 441 can be cooled again by the first cooler 47, thereby reducing product vaporization loss.

[0043] As an example, a second cooler 34 may be provided on the discharge pipe 32.

[0044] Based on the above structure, the liquid medium in the discharge pipe 32 is cooled again by the second cooler 34 in order to reduce product vaporization loss.

[0045] As an example, the heat exchange area of ​​the first condenser is set according to predetermined calculations to ensure that the evaporated material gas condenses at the dew point, thereby causing the liquid returning to the tower to be at the bubble point, thus saving energy.

[0046] As an example, a heat source system is installed in the vessel body 21, which can be a steam system, a thermal oil system, or an electric heating system. This solution can select different heat sources according to the actual site conditions.

[0047] Example 2

[0048] This solution provides a novel production apparatus capable of both intermittent and continuous distillation, perfectly solving the aforementioned problems and integrating the advantages of both.

[0049] Continuous distillation process: First, the material is pressurized by the feed pump 12 and metered by the first flow meter 13, then continuously enters the distillation kettle 2. After the liquid level in the distillation kettle 2 reaches the control level, steam is turned on to heat it to boiling and vaporize it. The vapor phase enters the first condenser assembly 41 at the top of the column through the distillation column 22. Circulating water is introduced into the tube side of the first condenser assembly 41. The material vapor in the shell side is cooled and liquefied, and then undergoes total reflux. After a period of total reflux, the fluid at the top of the column is divided into two paths: one path is metered by the second flow meter 14 and continues to reflux, and the other path is metered by the third flow meter 15 and then collected. The gas that is not condensed by the first condenser assembly 41 is separated by the gas-liquid separator and enters the second condenser assembly 43 for condensation. Then, it is metered by the fourth flow meter 16 and the light component is collected. At the same time, the heavy component in the bottom of the column is pumped into the cooler by the heavy component discharge pump 31 for cooling, and then metered by the fifth flow meter 17 and discharged. In this way, the entire process realizes continuous feeding and continuous discharge from the top and bottom of the column.

[0050] Batch distillation process flow: The system is equipped with a distillation vessel 2 of a certain volume, which serves as a container for the batch distillation liquid. Feed is introduced into the distillation vessel 2 in batches via feed pump 12. Then, feed pump 12 is shut off, and the bottom discharge pump 31 is shut off simultaneously. Steam heating of the distillation vessel 2 is initiated to induce boiling and vaporization. Temperature and pressure within the column are controlled to facilitate mass and heat transfer between the gas and liquid phases within the distillation column 22. The gas phase passes through the distillation column 22 and enters the overhead condenser. Circulating water flows through the tube side of the overhead condenser. The material vapor in the shell side liquefies upon cooling and undergoes total reflux. After a period of total reflux, the fluid at the top of the column splits into two paths: one path is metered by a second flow meter 14 and continues to reflux, while the other path is metered by a third flow meter 15 and collected. The gas that is not condensed by the first-stage condenser is separated by a gas-liquid separator and enters the second condenser assembly 43 for condensation. Finally, it is metered by a fifth flow meter 17 and collected as a light component. Through control, the fore-distillate, transition fraction, and product are obtained at the top of the column, while the heavy component is obtained at the bottom, thus achieving batch distillation.

[0051] This system can achieve batch distillation and can also be quickly converted to a continuous distillation system through special control methods. Specifically, the system is equipped with a distillation vessel 2 of a certain volume, which serves as a container for batch distillation of liquids. Feed pump 12 feeds the liquid into the distillation vessel 2 in batches. Then, feed pump 12 is shut off, and the bottom discharge pump 31 is shut off simultaneously. Steam is turned on to heat the distillation vessel 2, controlling the temperature and pressure within the column. This allows for mass and heat transfer between the gas and liquid phases within the distillation column 22. At the top of the column, the fore-distillate, transition fraction, and product are obtained, while the bottom of the column yields the heavier components, thus achieving batch distillation. Alternatively, by turning on feed pump 12 and discharge pump 31, and maintaining a balance between feed and discharge through DCS control, the system can be converted from batch distillation to continuous distillation.

[0052] The system is equipped with a feed pump 12. After the material is pressurized, it is measured by a flow meter and then continuously enters the distillation kettle 2, thus realizing continuous feeding.

[0053] This system is equipped with a bottom discharge pump 31. After being metered by a flow meter, the heavy components in the bottom of the tower are continuously discharged.

[0054] The distillation column 22 of this system is equipped with a first condenser assembly 41 and a second condenser assembly 43 at the top. The heat exchange area of ​​the first condenser assembly 41 is strictly calculated to ensure that the evaporated material gas condenses at the dew point, thereby making the liquid flowing back into the column at the bubble point, saving energy. The uncondensed material gas is separated by a gas-liquid separator, and the gas phase enters the second condenser assembly 43 for the removal of light components. The light components are metered by a flow meter and then collected. The product at the top of the column is metered by a flow meter and then cooled by a dedicated cooler at the bottom before being collected.

[0055] The flow rate display of this system satisfies the following condition: the measured value of the first flow meter 13 = the measured value of the second flow meter 14 + the measured value of the third flow meter 15 + the measured value of the fourth flow meter 16 + the measured value of the fifth flow meter 17, thereby ensuring continuous feeding and discharging of materials throughout the system and achieving balanced production.

[0056] This system can be equipped with a DCS control system to control parameters such as temperature, pressure, flow rate, and liquid level.

[0057] This system is equipped with a product cooler to further cool the extracted product and reduce product vaporization loss;

[0058] The heat source used in this system is diverse, including steam, thermal oil, or electric heating.

[0059] This system can quickly switch between batch and continuous distillation operations, meeting the needs of both large-scale continuous production and small-batch, multi-variety batch production. It is a fast, efficient, and low-cost distillation system.

[0060] 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 and improvements 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 production system for converting batch distillation to continuous distillation, characterized in that: It includes a feed section (1), a distillation vessel (2), a discharge section (3), and a condenser section (4); the distillation vessel (2) has a predetermined volume; the feed section (1) is connected to the distillation vessel (2), the condenser section (4) is connected to the steam outlet end of the distillation vessel (2), and the discharge section (3) is connected to the steam outlet end of the distillation vessel (2) and the bottom discharge end of the distillation vessel (2).

2. The production system for converting batch distillation to continuous distillation as described in claim 1, characterized in that: The feeding section includes a storage section (11), a feed pump (12) and a first flow meter (13); the feed pump (12) is connected to the storage section (11) and the distillation vessel (2) through pipelines respectively, and the first flow meter (13) is installed on the pipeline connecting the feed pump (12) and the distillation vessel (2).

3. The production system for converting batch distillation to continuous distillation as described in claim 2, characterized in that: The distillation vessel (2) includes a vessel body (21), a distillation column (22) and a reflux line (23). The distillation column (22) is located at the top of the vessel body (21) and is connected to the condenser (4) through the reflux line (23).

4. The production system for converting batch distillation to continuous distillation as described in claim 3, characterized in that: The condensation section (4) includes a first condensation assembly (41), a first gas-liquid separator (42), and a second condensation assembly (43); the first condensation assembly (41) and the first gas-liquid separator (42) are disposed on the return pipeline (23), the first gas-liquid separator (42) is disposed at the bottom of the first condensation assembly (41), and a diversion pipeline (44) is also connected to the first gas-liquid separator (42); the second condensation assembly (43) is disposed on the diversion pipeline (44); and a first extraction pipe (45) is also disposed on the return pipeline (23).

5. The production system for converting batch distillation to continuous distillation as described in claim 4, characterized in that: The end of the diversion pipeline (44) is also provided with a second extraction pipe (441), a second gas-liquid separator (442) and a waste gas discharge pipe (443); the second condensation assembly (43) is provided on the diversion pipeline, before the second gas-liquid separator (442), the second extraction pipe (441) and the waste gas discharge pipe (443) are respectively connected to the liquid outlet and the gas outlet of the second gas-liquid separator (442).

6. The production system for converting batch distillation to continuous distillation as described in claim 5, characterized in that: The discharge section (3) includes a discharge pump (31), a discharge pipe (32) and a collection tank (33); the discharge pump (31) is connected to the liquid storage port of the vessel body (21) through a pipeline, and the collection tank (33) is connected to the discharge pump (31) through the discharge pipe (32).

7. The production system for converting batch distillation to continuous distillation as described in claim 6, characterized in that: A second flow meter (14) is installed on the return pipe (23), a third flow meter (15) is installed on the first extraction pipe (45), a fourth flow meter (16) is installed on the second extraction pipe (441), and a fifth flow meter (17) is installed on the discharge pipe (32).

8. The production system for converting batch distillation to continuous distillation as described in claim 7, characterized in that: The first extraction pipe (45) and the second extraction pipe (441) are provided with a manifold (46) at their ends, and a first cooler (47) is provided on the manifold (46).

9. The production system for converting batch distillation to continuous distillation as described in claim 8, characterized in that: A second cooler (34) is provided on the discharge pipe (32).

10. The production system for converting batch distillation to continuous distillation as described in claim 9, characterized in that: The vessel body (21) is equipped with a heat source system, which is a steam system, a heat transfer oil system, or an electric heating system.

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