A butanol recovery system

Abstract

The utility model discloses a butanol recovery system, including alcohol tower unit, butanol tower unit, butanol purification tower unit, methanol tower unit, butanol tower unit includes butanol tower and butanol chromatograph, after raw material enters the alcohol tower of alcohol tower unit, alcohol tower cooling divides into two ways, one way backflow to alcohol tower, another way with methanol tower unit's methanol tower intercommunication, the still pot of methanol tower divides into two ways after cooling through methanol tower still pot cooler, one way with butanol feed tank intercommunication, another way is connected to the collection jar through the valve pipeline, alcohol tower, butanol tower unit's butanol tower all with butanol chromatograph intercommunication, the still pot liquid of butanol tower with butanol purification tower unit's butanol purification tower intercommunication. The utility model discloses can improve the recovery rate of butanol, and the setting of valve can intermittently discharge the light component accumulated in the system, and butanol feed tank is cooled through the cooler and is layered through butanol chromatograph, makes butanol tower obtain 99% n-butanol aqueous solution, makes and through this system n-butanol recovery rate improves to above 80%.

Description

Technical Field

[0001] This utility model relates to the field of chemical system technology, specifically to a butanol recovery system. Background Technology

[0002] 1,4-Butanediol (BDO) is an important organic and fine chemical raw material widely used in pharmaceuticals, chemicals, textiles, papermaking, automobiles, and daily chemical products. BDO can be used to produce tetrahydrofuran (THF), polybutylene terephthalate (PBT), gamma-butyrolactone (GBL), polyurethane resins (PU Resin), coatings, plasticizers, and as a solvent and brightener in the electroplating industry. The byproduct, n-Butanol, is an important tetracarbon alcohol with wide applications in chemicals, energy, and pharmaceuticals, acting as a solvent, plasticizer, and fuel additive. The acetylacetonate-aldehyde BDO process produces an aqueous butanol solution as a byproduct, typically containing 1–10 wt% butanol. The acetylacetonate-aldehyde process generally incorporates a purification and recovery system. Butanol aqueous solution mainly contains n-butanol, water, small amounts of n-propanol, methanol, and heavy components. Methanol and n-propanol are miscible with water, while both n-propanol and n-butanol form azeotropes with water, making direct separation by distillation impossible. The azeotropic temperature of n-propanol-water is 87.7℃, and that of n-butanol-water is 94.2℃. n-Butanol and water are partially miscible below 125℃, and upon settling, they separate into oil and water phases. However, the density difference between the oil and water phases is small, resulting in poor oil-water chromatography separation. Due to the azeotropic nature of multiple alcohols with water in butanol aqueous solution, the butanol recovery systems designed by some BDO (butanol-acetylene-based) plants are not operating ideally. Not only are qualified butanol products unavailable and but butanol yields are low, but butanol levels in wastewater exceed standards, leading to significant wastewater treatment pressure and severely hindering normal production. As BDO plants grow to 200,000 to 300,000 tons per year, the recovery of byproduct butanol is becoming increasingly economically valuable and is receiving more and more attention. Utility Model Content

[0003] This utility model addresses at least one of the aforementioned technical problems in the prior art by disclosing a butanol recovery system. The system comprises an alcohol tower unit, a butanol tower unit, a butanol purification tower unit, a methanol tower unit, and valves that work in concert to increase the n-butanol recovery rate to over 80%, with a n-butanol content ≥99.6 wt% and a water content ≤0.08 wt%, meeting national standards. Furthermore, the system boasts high recovery efficiency, significantly improving work efficiency.

[0004] This utility model is achieved through the following technical solution:

[0005] This invention first provides a butanol recovery system, including an alcohol tower unit, a butanol tower unit, a butanol purification tower unit, and a methanol tower unit. The butanol tower unit includes a butanol tower and a butanol chromatograph. After the raw material enters the alcohol tower of the alcohol tower unit, the alcohol tower is connected to the alcohol tower top condenser and then splits into two paths: one path is refluxed back to the alcohol tower, and the other path is connected to the methanol tower of the methanol tower unit. The bottom of the methanol tower is cooled by the methanol tower bottom cooler and then splits into two paths: one path is connected to the butanol feed tank, and the other path is connected to the collection tank via a valve pipeline. The butanol tower of the alcohol tower and the butanol tower unit are both connected to the butanol chromatograph. The bottom liquid of the butanol tower is connected to the butanol purification tower of the butanol purification tower unit for further purification of n-butanol product.

[0006] As a further option, the top of the alcohol column is connected in sequence to the alcohol column top condenser and the alcohol column reflux tank, and then splits into two paths: one path is connected to the methanol column, and the other path is refluxed back to the alcohol column; the middle side of alcohol column 11 is connected to the butanol column top condenser; and the lower end is connected to the alcohol column bottom cooler.

[0007] As a further option, the alcohol tower tray is a DVST double-layer gas-liquid co-flow tray.

[0008] As a further embodiment, the butanol column unit also includes a butanol column top condenser. The top of the butanol column flows back to the butanol column after passing through the butanol column top condenser, butanol feed tank, butanol cooler, and butanol chromatograph in sequence. The butanol chromatograph is also connected to the alcohol column.

[0009] As a further option, the volume of the butanol chromatography apparatus shall be no less than 25 m³. 3 .

[0010] As a further option, a butanol column reboiler is connected in parallel to the butanol column, and a steam input pipe is installed on one side of the butanol column reboiler.

[0011] As a further embodiment, the butanol purification tower unit also includes a butanol purification tower top condenser. The top of the butanol purification tower is connected to the butanol purification tower via the butanol purification tower top condenser and the butanol purification tower top reflux tank to form a reflux pipeline. The butanol purification tower top reflux tank is also equipped with a light component discharge pipeline. The middle side of the butanol purification tower is connected to the butanol product cooler for collecting the butanol product, and the bottom of the butanol purification tower is connected to the butanol purification tower bottom cooler for discharging the heavy components.

[0012] As a further option, the butanol purification tower is also connected in parallel with a butanol purification tower reboiler, which is also used to introduce steam.

[0013] As a further option, the reboiler at the bottom of the butanol purification tower is also connected to the steam condensate decomposition zone via the condensate tank of the reboiler at the bottom of the butanol purification tower.

[0014] As a further option, the top of the methanol tower is connected to the methanol tower via a methanol tower top condenser and a methanol tower top reflux tank to form a reflux pipeline. The methanol tower top reflux tank is also equipped with a light component discharge pipeline. The bottom of the methanol tower bottom is cooled by a methanol tower bottom cooler and then split into two paths. One path is connected to the butanol feed tank, and the other path is connected to the collection tank via a valve pipeline.

[0015] As a further option, the valve is a mechanical valve.

[0016] As a further option, the methanol tower is also connected in parallel with a methanol tower reboiler, which is also used to introduce steam.

[0017] As a further option, the methanol tower reboiler is also connected to the steam condensate decomposition zone via the methanol tower reboiler condensate tank.

[0018] The features and beneficial effects of this utility model are as follows:

[0019] (1) The alcohol tower unit, butanol tower unit, butanol purification tower unit, methanol tower unit and valves set in this utility model cooperate with each other. The methanol tower unit can further improve the recovery rate of butanol. The valve can intermittently discharge the light components accumulated in the system. The butanol feed tank is cooled by the cooler and separated by the butanol chromatograph, so that the bottom of the butanol tower is given a 99% n-butanol aqueous solution. This makes the recovery rate of n-butanol through this system higher than 80%, the n-butanol content ≥99.6wt%, and the water content ≤0.08wt%, which meets the national standard requirements.

[0020] (2) The system of this utility model has a wide range of applications, and the applicable concentration range of the raw materials is greater than or equal to 1.3wt%, making it more versatile.

[0021] (3) The butanol tower, butanol purification tower and methanol tower of this utility model are all connected in parallel with a reboiler, which is beneficial to increase the distillation rate inside the tower bottom and improve the working efficiency of the whole system. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model, 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 some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a flowchart of the butanol recovery system described in an embodiment of the present invention.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1-Alcohol tower unit; 11-Alcohol tower; 12-Alcohol tower overhead condenser; 13-Alcohol tower reflux tank; 14-Alcohol tower reboiler; 2-Butanol tower unit; 21-Butanol tower; 22-Butanol cooler; 23-Butanol chromatography unit; 24-Butanol tower reboiler; 25-Butanol tower overhead condenser; 26-Butanol feed tank; 3-Butanol purification tower unit; 31-Butanol purification tower; 32-Butanol purification tower overhead reflux tank; 33-Butanol product cooler Equipment; 34-Butanol purification tower reboiler; 35-Butanol purification tower reboiler condensate tank; 36-Butanol purification tower reboiler cooler; 37-Butanol purification tower overhead condenser; 4-Methanol tower unit; 41-Methanol tower; 42-Methanol tower overhead reflux tank; 43-Methanol tower reboiler; 44-Methanol tower reboiler condensate tank; 45-Methanol tower reboiler cooler; 46-Methanol tower overhead condenser; 5-Valve; 6-Collection tank. Detailed Implementation

[0026] To facilitate understanding of this utility model, a more comprehensive description of this utility model will be provided below, along with embodiments of this utility model, but this does not limit the scope of this utility model.

[0027] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. 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 indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] This invention addresses the problems of low butanol recovery efficiency, low product qualification rate, and substandard wastewater generated during the recovery process in existing technologies. It provides a butanol recovery system that utilizes four interconnected tower units and valves to achieve multiple purification and distillation processes. This results in a recovered product with a butanol content ≥99.6 wt% and a water content ≤0.08 wt%, meeting national standards. The wastewater meets the COD <1500 standard for compliant discharge. The valves intermittently discharge light components from the system, preventing their accumulation. The alcohol tower unit also provides steam for energy. The butanol tower, butanol purification tower, and methanol tower are all connected in parallel to a reboiler, which also supplies steam, significantly increasing the distillation rate within the towers and thus improving the overall system recovery rate.

[0030] A butanol recovery system, such as Figure 1 As shown, the system includes an alcohol tower unit 1, a butanol tower unit 2, a butanol purification tower unit 3, and a methanol tower unit 4. After the raw material enters the alcohol tower 11 of the alcohol tower unit 1, the top of the alcohol tower 11 is divided into two streams after passing through the alcohol tower top condenser 12. One stream flows back to the alcohol tower 11, and the other stream is connected to the methanol tower 41 of the methanol tower unit 4. The bottom of the methanol tower 41 is cooled by the methanol tower bottom cooler 45 and then divided into two streams. One stream is connected to the butanol feed tank 26, and the other stream is connected to the collection tank 6 via a valve 5. The valve 5 is used to control the intermittent discharge of light components of the system. The butanol tower 21 of the alcohol tower unit 11 and the butanol tower 21 of the butanol tower unit 2 are both connected to the butanol chromatography unit 23. The bottom liquid of the butanol tower 21 is connected to the butanol purification tower 31 of the butanol purification tower unit 3 for further purification of the n-butanol product.

[0031] The methanol tower 41 significantly improved the recovery rate of n-butanol.

[0032] The alcohol tower unit 1 includes an alcohol tower 11, an alcohol tower bottom cooler 14, an alcohol tower top condenser 12, and an alcohol tower reflux tank 13. The top of the alcohol tower 11 is connected to the alcohol tower top condenser 12 and the alcohol tower reflux tank 13 in sequence, and then splits into two paths. One path is connected to the methanol tower 41, and the other path is returned to the alcohol tower 11. The middle side of the alcohol tower 11 is connected to the butanol tower top condenser 25, and the lower end is connected to the alcohol tower bottom cooler 14.

[0033] In some embodiments, the butanol column top condenser 25 is used to cool the materials collected from the alcohol column 11 and the butanol column 21.

[0034] In some embodiments, in order to improve the compliance rate of wastewater discharge, the trays of alcohol tower 11 are DVST double-layer gas-liquid co-flow trays.

[0035] The butanol column unit 2 includes a butanol column 21, a butanol feed tank 26, a butanol cooler 22, a butanol chromatography column 23, a butanol column reboiler 24, and a butanol column top condenser 25. The top of the butanol column 21 flows back to the butanol column 21 after passing through the butanol column top condenser 25, the butanol feed tank 26, the butanol cooler 22, and the butanol chromatography column 23 in sequence. The butanol chromatography column 23 is also connected to the alcohol column 11. The bottom of the butanol column 21 is also connected to the butanol purification column 31.

[0036] In some embodiments, the butanol column 21 is also connected in parallel with a butanol column reboiler 24, which is used to accelerate the distillation rate in the butanol column 21. A steam input pipe is also installed on one side of the butanol column reboiler 24.

[0037] In some embodiments, the volume of the butanol chromatography unit 23 is not less than 25 m³. 3 This allows the material to remain in the butanol chromatography unit 23 for a longer period of time, which is conducive to chromatography.

[0038] The butanol purification tower unit includes a butanol purification tower 31, a butanol purification tower top condenser 37, a butanol purification tower top reflux tank 32, a butanol product cooler 33, a butanol purification tower bottom reboiler 34, a butanol purification tower bottom reboiler condensate tank 35, and a butanol purification tower bottom cooler 36. The top of the butanol purification tower 31 is connected to the butanol purification tower 31 via the butanol purification tower top condenser 37 and the butanol purification tower top reflux tank 32 to form a reflux pipeline. The butanol purification tower top reflux tank 32 is also equipped with a light component discharge pipeline. The middle side of the butanol purification tower 31 is connected to the butanol product cooler 33 for collecting butanol product, and the bottom of the butanol purification tower 31 is connected to the butanol purification tower bottom cooler 36 for discharging heavy components.

[0039] In some embodiments, a butanol purification column 31 is further connected in parallel with a butanol purification column reboiler 34, which is used to introduce steam. The butanol purification column reboiler 34 is used to increase the distillation rate inside the butanol purification column 31, and the steam is used to provide heat.

[0040] In some embodiments, the butanol purification tower reboiler 34 is also connected to the steam condensate decontamination zone via the butanol purification tower reboiler condensate tank 35.

[0041] The methanol tower unit includes a methanol tower 41, a methanol tower top condenser 46, a methanol tower top reflux tank 42, a methanol tower bottom reboiler 43, a methanol tower bottom reboiler condensate tank 44, and a methanol tower bottom cooler 45. The top of the methanol tower 41 is connected to the methanol tower 41 via the methanol tower top condenser 46 and the methanol tower top reflux tank 42 to form a reflux pipeline. The methanol tower top reflux tank 42 is also equipped with a light component discharge pipeline. The bottom of the methanol tower 41 is cooled by the methanol tower bottom cooler 45 and then split into two paths. One path is connected to the butanol feed tank 26, and the other path is connected to the collection tank 6 via valve 5. Therefore, the light components in the system can be intermittently discharged by controlling the opening and closing of valve 5 to avoid component accumulation.

[0042] In some embodiments, a methanol tower reboiler 43 is connected in parallel to the methanol tower 41. The methanol tower reboiler 43 is also used to introduce steam. The methanol tower reboiler 43 is used to increase the distillation rate inside the methanol tower 41, and the steam is used to provide heat.

[0043] In some embodiments, the methanol tower reboiler 43 is also connected to the vapor condensate de-bound zone via the methanol tower reboiler condensate tank 44.

[0044] The condenser and reboiler in this solution are both commonly used in the chemical industry and can achieve the above functions.

[0045] The working principle of the butanol recovery system is as follows:

[0046] The by-product butanol aqueous solution collected from the top of the atmospheric distillation column is fed into the alcohol column 11 for rectification. The top of the alcohol column 11 is condensed by the alcohol column top condenser 12 to remove light components such as methanol, tetrahydrofuran, and n-propanol, and these light components are fed into the methanol column 41. At the same time, the condensed mixture containing a large amount of water and n-butanol is refluxed back to the alcohol column 11. Steam is also introduced into the alcohol column 11 to provide heat. After the alcohol column 11 obtains qualified wastewater, most of the water is removed by the alcohol column bottom cooler 14. The gas phase collected from the middle side of the alcohol column 11 is fed into the butanol column top condenser 25 for condensation. After extracting the high-concentration n-butanol aqueous solution, it is sent to the butanol feed tank 26.

[0047] The n-butanol aqueous solution containing light components collected from the top of methanol tower 11 enters methanol tower 41. The methanol tower is added to further remove light components from the top of the tower, and to recover the n-butanol aqueous solution from the bottom of the tower. This process removes light components from the n-butanol aqueous solution and recovers the n-butanol aqueous solution, thereby improving the n-butanol recovery rate. After condensation to remove light components from the top of methanol tower 41, the n-butanol aqueous solution recovered from the bottom of the tower is cooled and then divided into two streams and sent to butanol feed tank 26 and collection tank 6. Sending the solution to collection tank 6 is to reduce the accumulation of light components in the system. The accumulated light components in the system are discharged intermittently by controlling the opening and closing of valve 5, which effectively reduces the accumulation of light components in the system. (Valve 5 is a commonly used industrial mechanical valve. Methanol tower 41 has a thermometer to monitor the temperature of the top and bottom of the methanol tower. When the operator sees that the temperature gauges at the top and bottom of the methanol tower have reached the set value, which needs to be determined according to the actual situation, valve 5 is manually opened, allowing a portion of the liquid to enter the combustion collection tank 6. When the values ​​displayed by both thermometers are greater than the set value, the operator manually closes valve 5, thereby achieving the purpose of intermittently discharging the accumulated light components in methanol tower 41.)

[0048] The vapor phase collected from the side of methanol tower 11 is condensed in the top condenser of the methanol tower and mixed with the bottom liquid of methanol tower 41 before being sent to butanol feed tank 26. It is then cooled by butanol cooler 22 and sent to butanol chromatography tank 23 for stratification. The lower aqueous phase is sent to the lower part of methanol tower 11 for further water removal; the upper oil phase is sent to butanol tower 21 for further purification of n-butanol. The water collected from the top of butanol tower 21 and the n-butanol azeotrope are condensed in the top condenser 25 of the butanol tower and sent to the butanol feed tank. 26. After being cooled by butanol cooler 22, the product is separated by butanol chromatography 23. The bottom of butanol column 21 yields a 99% n-butanol aqueous solution. The bottom liquid of butanol column 21 is sent to butanol purification column 31 for distillation to further purify the n-butanol product to meet national standards. The light component is collected from the top of butanol purification column 31 to prevent its accumulation in the process. The heavy component is collected from the bottom of butanol purification column 31. The n-butanol product is collected from the side of butanol purification column 31.

[0049] Example 1

[0050] The raw material contains 0.10 wt% methanol, 1.3 wt% n-butanol, 98.56 wt% water, 0.01 wt% BDO, 0.01 wt% GBL, 0.01 wt% THF, and 0.01 wt% propanol. The flow rate of the raw material into alcohol tower 11 is 20 m³ / s. 3 At a temperature of 80℃ and a pressure of 120 kPag, the butanol recovery system yielded a butanol content of 99.7 wt%, a water content of 0.08 wt%, and a wastewater COD of 1400.

[0051] Example 2

[0052] The raw material contains 0.05 wt% methanol, 2.0 wt% n-butanol, 97.91 wt% water, 0.01 wt% BDO, 0.01 wt% GBL, 0.01 wt% THF, and 0.01 wt% propanol. The flow rate of the raw material into alcohol tower 11 is 20 m³ / s. 3 At a temperature of 70℃ and a pressure of 120 kPag, the butanol recovery system yielded a butanol content of 99.8 wt%, a water content of 0.06 wt%, and a wastewater COD of 1300.

[0053] Example 3

[0054] The raw material contains 0.05 wt% methanol, 60 wt% n-butanol, 39.91 wt% water, 0.01 wt% BDO, 0.01 wt% GBL, 0.01 wt% THF, and 0.01 wt% propanol. The flow rate of the raw material into alcohol tower 11 is 20 m³ / s. 3 At a temperature of 70℃ and a pressure of 120 kPag, the butanol recovery system yields a butanol content of 99.9 wt%, a water content of 0.03 wt%, and a wastewater COD of 1200.

[0055] Table 1 summarizes Examples 1 to 3.

[0056] Table 1

[0057]

[0058] As shown in Table 1 above, this system can adapt to situations where the concentration of n-butanol in the raw material is very low. The concentration of n-butanol in the raw material should be greater than or equal to 1.3 wt%, and the higher the concentration, the better the purification effect. Through this system, the n-butanol content is ≥99.6 (wt%), the water content is ≤0.08 (wt%), which meets the national standard requirements; the n-butanol recovery rate is increased to over 80%, and the wastewater indicators require COD <1500, and the wastewater can meet the discharge standards.

[0059] In summary, this application utilizes an additional methanol column to further remove light components from the top of the methanol column, improving the recovery rate of n-butanol. The n-butanol aqueous solution recovered from the methanol column bottom is cooled and split into two streams, one sent to the butanol feed tank and the other to the collection tank. The collection tank is used to reduce the accumulation of light components in the system, allowing for intermittent discharge of accumulated light components. The butanol feed tank is cooled by a cooler and then separated by a butanol chromatography unit, resulting in a 99% n-butanol aqueous solution at the butanol column bottom. This method has a wide applicability, suitable for concentrations greater than or equal to 1.3 wt%.

[0060] It should be noted that 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 butanol recovery system, characterized in that: It includes an alcohol tower unit, a butanol tower unit, a butanol purification tower unit, and a methanol tower unit. The butanol tower unit includes a butanol tower and a butanol chromatograph. After the feed enters the alcohol tower of the alcohol tower unit, the alcohol tower is connected to the alcohol tower top condenser and then splits into two streams. One stream is refluxed back to the alcohol tower, and the other stream is connected to the methanol tower of the methanol tower unit. The bottom of the methanol tower is cooled by the methanol tower bottom cooler and then splits into two streams. One stream is connected to the butanol feed tank, and the other stream is connected to the collection tank via valves and pipelines. The butanol towers of the alcohol tower and butanol tower units are both connected to the butanol chromatograph. The butanol tower is connected to the butanol purification tower of the butanol purification tower unit for further purification of n-butanol product.

2. The butanol recovery system according to claim 1, characterized in that: The top of the alcohol column is connected in sequence to the alcohol column top condenser and the alcohol column reflux tank, and then splits into two paths: one path is connected to the methanol column, and the other path is refluxed back to the alcohol column; the middle side of the alcohol column is connected to the butanol column top condenser; and the lower end is connected to the alcohol column bottom cooler.

3. The butanol recovery system according to claim 1, characterized in that: The alcohol tower uses a DVST double-layer gas-liquid co-flow tray.

4. The butanol recovery system according to claim 1, characterized in that: The butanol column unit also includes a butanol column top condenser. The top of the butanol column flows back to the butanol column after passing through the butanol column top condenser, butanol feed tank, butanol cooler, and butanol chromatography in sequence. The butanol chromatography is also connected to the alcohol column.

5. The butanol recovery system according to claim 1, characterized in that: The volume of the butanol chromatography apparatus shall not be less than 25m³. 3 .

6. The butanol recovery system according to claim 4, characterized in that: The butanol column is also connected in parallel with a butanol column reboiler, and a steam input pipe is installed on one side of the butanol column reboiler.

7. The butanol recovery system according to claim 1, characterized in that: The butanol purification tower unit also includes a butanol purification tower top condenser. The top of the butanol purification tower passes through the butanol purification tower top condenser and the butanol purification tower top reflux tank in sequence, and then connects to the butanol purification tower to form a reflux pipeline. The butanol purification tower top reflux tank is also equipped with a light component discharge pipeline. The middle side of the butanol purification tower is connected to the butanol product cooler for collecting the butanol product, and the bottom of the butanol purification tower is connected to the butanol purification tower bottom cooler for discharging the heavy components.

8. The butanol recovery system according to claim 7, characterized in that: The butanol purification tower is also connected in parallel with a butanol purification tower bottom reboiler, which is also used to introduce steam.

9. A butanol recovery system according to claim 8, characterized in that: The butanol purification tower reboiler is also connected to the steam condensate decomposition area via the butanol purification tower reboiler condensate tank.

10. A butanol recovery system according to claim 1, characterized in that: The top of the methanol tower passes through the methanol tower top condenser and the methanol tower top reflux tank in sequence, and then connects to the methanol tower to form a reflux pipeline. The methanol tower top reflux tank is also equipped with a light component discharge pipeline. The bottom of the methanol tower bottom is cooled by the methanol tower bottom cooler in sequence and then splits into two paths. One path is connected to the butanol feed tank, and the other path is connected to the collection tank through a valve pipeline.

11. A butanol recovery system according to claim 1, characterized in that: The valve is a mechanical valve.

12. The butanol recovery system according to claim 10, characterized in that: The methanol tower is also connected in parallel with a methanol tower reboiler, which is also used to introduce steam.

13. A butanol recovery system according to claim 12, characterized in that: The methanol tower reboiler is also connected to the steam condensate decomposition zone via the methanol tower reboiler condensate tank.

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