Ethanol recovery device

Abstract

The utility model relates to the technical field of chemical process and engineering, in particular to an ethanol recovery device, which is characterized in that a first conveying pipeline is communicated with the middle of a rectifying tower and is used for conveying acidic hydrous ethanol steam, and an output pipeline is connected with the top of the rectifying tower and is used for outputting ethanol steam; a second conveying pipeline is arranged at the top in the rectifying tower in the horizontal direction and is communicated with a main conveying pipe arranged outside the rectifying tower; the collecting tank is arranged at the bottom of the rectifying tower, communicated with the bottom of the rectifying tower and used for collecting a mixed solution of sodium chloride, ethanol and water; the reboiler is arranged outside the collecting tank, the reboiler is provided with an inlet and an outlet, the inlet and the outlet of the reboiler are respectively communicated with the collecting tank through pipelines, and the reboiler is used for revaporizing ethanol and water in the fed mixed solution of sodium chloride, ethanol and water. The ethanol recovery device solves the problems that the existing ethanol recovery device needs a plurality of devices to recover absolute ethanol step by step, and the recovery efficiency is low.

Description

Technical Field

[0001] The utility model relates to the technical field of chemical process and engineering, in particular to an ethanol recovery device. Background Art

[0002] Glufosinate is a mixture of L-glufosinate and D-glufosinate racemates, and is a highly effective, low-toxic, broad-spectrum contact-type organophosphorus herbicide, with increasing usage year by year and huge market potential. Therefore, the preparation of intermediates (i.e., (S)-4-chloro-2-aminobutyrate and (S)-4-chloro-2-aminobutyric acid) for the synthesis of L-glufosinate has attracted widespread attention.

[0003] When preparing the intermediate of L-phosphinothion, the reaction raw materials or reaction conditions used may change, which may lead to the generation of acidic aqueous ethanol vapor as a side reaction product. A large amount of acidic aqueous ethanol vapor will not only corrode the equipment, affecting the life and performance of the equipment, but also directly discharge the acidic aqueous ethanol vapor, causing environmental pollution and harming human health. Therefore, a treatment device is required to treat the generated acidic aqueous ethanol vapor.

[0004] When the acidic aqueous ethanol vapor is processed, the acidic aqueous ethanol vapor produced by the L-phosphinothion intermediate is sent to the condenser through a delivery pipeline for condensation, and then the acidic aqueous ethanol vapor becomes an acidic aqueous ethanol solution, and then the acidic aqueous ethanol solution is sent to the alkaline solution reactor through a pipeline for acid-base neutralization reaction, and the neutralized ethanol solution is sent to the distillation tower for distillation to separate the volatile components in the solution, and the distillate after distillation is sent to the rectification tower to separate the two components with relatively small volatility in the solution, and the separated liquid ethanol is condensed and collected. Although the ethanol recovery device can recover the ethanol in the acidic aqueous ethanol vapor and avoid the harm to the environment caused by the direct discharge of the acidic aqueous ethanol vapor, when the ethanol recovery device processes the acidic aqueous ethanol vapor, multiple devices are required to be carried out in multiple steps, which has high energy consumption and low processing efficiency. Utility Model Content

[0005] The purpose of the utility model is to overcome the above-mentioned problems existing in the prior art and to provide an ethanol recovery device, which solves the problem of low recovery efficiency caused by the prior ethanol recovery device requiring multiple devices to recover anhydrous ethanol in steps, and can continuously process acidic aqueous ethanol vapor and recover ethanol with high processing efficiency.

[0006] The utility model provides an ethanol recovery device, including an ethanol recovery device, comprising:

[0007] A distillation tower, wherein the middle part is connected with a first delivery pipeline, the first delivery pipeline is used to deliver acidic aqueous ethanol vapor, the top of the tower is connected with an output pipeline, the output pipeline is used to deliver ethanol vapor, a second delivery pipeline is horizontally arranged at the top of the distillation tower, the second delivery pipeline is connected with a delivery main pipe arranged outside the distillation tower, and the delivery main pipe is used to deliver sodium ethanol ethanol solution;

[0008] A collecting tank is arranged at the bottom of the distillation tower and is connected to the bottom of the distillation tower, and is used to collect a mixed solution of sodium chloride, ethanol and water;

[0009] The reboiler is arranged outside the collecting tank, and has an inlet and an outlet. The inlet and the outlet of the reboiler are respectively connected to the collecting tank through pipelines. The reboiler is used to re-vaporize the ethanol and water in the fed mixed solution of sodium chloride, ethanol and water.

[0010] Preferably, the second delivery pipeline is provided with a plurality of spray heads for spraying the sodium ethoxide ethanol solution.

[0011] Preferably, the liquid outlet direction of the plurality of spray heads is vertically downward.

[0012] Preferably, a condenser is connected to the output pipeline.

[0013] Preferably, a lift pump is provided on the pipeline connected to the reboiler inlet, a third delivery pipeline is connected to the pipeline connected to the reboiler outlet, the third delivery pipeline is communicated with the delivery main pipe, and the third delivery pipeline is used to deliver sodium ethanol ethanol solution.

[0014] Preferably, the pipeline connected to the reboiler outlet is also connected to a mixer.

[0015] Preferably, a pH meter is provided in the collection tank, a controller is provided on the collection tank, and the pH meter is electrically connected to the controller.

[0016] Preferably, a conductivity detector is provided in the collection tank, the conductivity detector is electrically connected to the controller, and an external discharge pipeline is provided on the collection tank.

[0017] Preferably, all of the pipelines are corrosion-resistant metal pipes.

[0018] Preferably, all of the pipelines are provided with valves.

[0019] Compared with the prior art, the beneficial effects of the utility model are:

[0020] The utility model provides a reaction device for an ethanol recovery device, which solves the problem that the existing ethanol recovery device needs multiple devices to recover anhydrous ethanol in steps, thus resulting in low recovery efficiency.

[0021] The utility model can overcome the problem that multiple devices are required for the recovery of anhydrous ethanol and the efficiency is low by using one device. The utility model does not need liquid sampling, but directly delivers the acidic aqueous ethanol vapor into the distillation tower through the first delivery pipeline, and then makes the acidic aqueous ethanol vapor delivered into the distillation tower contact with the sodium ethanol ethanol solution delivered into the distillation tower through the second delivery pipeline in reverse, so that the acid gas in the acidic aqueous ethanol vapor can be neutralized. At this time, part of the ethanol solution and the sodium chloride salt and the aqueous solution fall into the collection tank, while the ethanol vapor is discharged from the output pipeline, so that the ethanol recovery is realized. In this process, the acidic aqueous ethanol vapor does not need to be condensed and then neutralized, nor does it need to be distilled and rectified after neutralization, but can be solved by one-step distillation, thereby improving the recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of an ethanol recovery device of the utility model.

[0023] Description of reference numerals:

[0024] 1. Distillation tower, 2. First delivery pipeline, 3. Spray head, 4. Second delivery pipeline, 5. Collection tank, 6. First liquid infusion pipe, 7. Lifting pump, 8. Second liquid infusion pipe, 9. Reboiler, 10. Third liquid infusion pipe, 11. Mixer, 12. Third delivery pipeline, 13. Output pipeline, 14. Condenser. DETAILED DESCRIPTION

[0025] The following is combined with Figure 1 , the specific implementation of the utility model is described in detail, but it should be understood that the protection scope of the utility model is not limited by the specific implementation. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0026] The inventors have found that the ethanol recovery device currently used to recover acidic hydrous ethanol vapor is composed of multiple devices connected together. When recovering ethanol in the acidic hydrous ethanol vapor, the acidic hydrous ethanol vapor needs to be first sent to a condenser for condensation to obtain an acidic ethanol solution, and the acidic ethanol solution is then sent to an alkaline reactor for neutralization. The neutralized solution needs to be sent to a distillation tower for distillation, and the distilled solution needs to be sent to a distillation tower for distillation again. The liquid obtained by distillation needs to be condensed in a condenser to obtain an ethanol solution. The acidic hydrous ethanol vapor needs to be processed step by step by multiple devices, and the processing energy consumption is high and the efficiency is low.

[0027] In order to solve the problems existing in the above-mentioned prior art, the utility model provides an ethanol recovery device.

[0028] Refer to the attached Figure 1As shown, in the embodiment, an ethanol recovery device includes a first delivery pipeline 2 connected to the middle of a distillation tower 1, the first delivery pipeline 2 is used to transport acidic aqueous ethanol vapor, an output pipeline 13 is connected to the top of the tower, the output pipeline 13 is used to output ethanol vapor, a second delivery pipeline 4 is provided at the top of the distillation tower 1 in a horizontal direction, the second delivery pipeline 4 is connected to a delivery main pipe provided outside the distillation tower 1, and the delivery main pipe is used to transport sodium ethanol ethanol solution; a collecting tank 5 is provided at the bottom of the distillation tower 1 and is connected to the bottom of the distillation tower 1, and is used to collect a mixed solution of sodium chloride, ethanol and water; a reboiler 9 is provided outside the collecting tank 5, the reboiler 9 has an inlet and an outlet, the inlet and outlet of the reboiler 9 are respectively connected to the collecting tank 5 through pipelines, and the reboiler 9 is used to vaporize the ethanol and water in the fed mixed solution of sodium chloride, ethanol and water again.

[0029] When in use, it is necessary to feed the acidic aqueous ethanol vapor into the distillation tower 1 through the first delivery pipeline 2, start the reboiler 9 connected to the collecting tank 5, and then continuously feed the sodium ethoxide ethanol solution into the second delivery pipeline 4 located at the top of the distillation tower 1 through the delivery main pipe. At this time, the sodium ethoxide ethanol solution falls longitudinally from the top of the distillation tower 1 and contacts the acidic aqueous ethanol vapor fed into the distillation tower 1 through the first delivery pipeline 2 in the distillation tower 1 in reverse direction. At this time, the sodium ethoxide ethanol solution absorbs the acidic aqueous vapor in the acidic aqueous ethanol vapor, so that the acidic aqueous ethanol vapor is liquefied and Acid-base neutralization reaction occurs with sodium ethoxide to generate a mixed solution of sodium chloride, ethanol and water vapor, which is collected together in a collecting tank 5. Since the distillation tower 1 requires continuous gas, the low-boiling-point ethanol in the collecting tank 5 is vaporized and ascended by the reboiler 9, and the ethanol is output together with the ethanol in the acidic aqueous ethanol vapor through the output pipeline 13. The device eliminates the need for one-time condensation of the acidic aqueous ethanol vapor, and the neutralization and distillation react synchronously, without wasting neutralization heat, and can continuously process the acidic aqueous ethanol vapor and recover the ethanol vapor, thereby improving the reaction efficiency and reducing the energy consumption.

[0030] Specifically, a plurality of spray heads 3 are provided on the second conveying pipeline 4, and the liquid outlet direction of the plurality of spray heads 3 is vertically downward. The purpose of providing the plurality of spray heads 3 here is to increase the contact surface between the sodium ethoxide ethanol solution and the acidic aqueous ethanol vapor, so as to facilitate the rapid liquefaction of the acidic aqueous ethanol.

[0031] Specifically, the liquid outlet direction of the plurality of spray heads 3 is vertically downward, in order to increase the contact surface between the sprayed sodium ethoxide ethanol solution and the rising gas in the distillation tower.

[0032] Specifically, multiple layers of tower plates are arranged in the horizontal direction in the distillation tower 1. No multiple fillers are filled between two adjacent tower plates in the middle of the distillation tower 1, while multiple fillers are filled between other two adjacent tower plates. The purpose is to increase the contact time between the acidic aqueous ethanol vapor and the sodium ethanol ethanol solution to facilitate liquefaction as soon as possible.

[0033] Specifically, the output pipeline 13 is connected with a condenser 14 to collect the ethanol gas sent out from the output pipeline 13 and liquefy it into liquid.

[0034] Specifically, the collecting tank 5 is connected with a first infusion pipe 6, the infusion pipe 6 is connected with a lifting pump 7, the lifting pump 7 is connected with a second infusion pipe 8, the inlet of the reboiler 9 is connected with the second infusion pipe 8, the outlet of the reboiler 9 is connected with the collecting tank 5 through a third infusion pipe 10, the third infusion pipe 10 is connected with a third delivery line 12, the third delivery line 12 is connected with the delivery main pipe, and the third delivery line 12 is used to deliver sodium ethoxide ethanol solution, which is used to neutralize the excess acidic aqueous ethanol solution in the collecting tank 5.

[0035] Specifically, the pipeline connected to the outlet of the reboiler 9 is also connected to a mixer 11, the purpose of which is to mix the acidic aqueous ethanol solution and the sodium ethoxide ethanol solution in advance so that they can react fully.

[0036] Specifically, a pH meter is provided in the collection tank 5 , and a controller is provided on the collection tank 5 , and the pH meter is electrically connected to the controller.

[0037] Specifically, a conductivity detector is provided in the collecting tank 5 , and an external discharge pipeline is provided on the collecting tank 5 for discharging the liquid in the collecting tank 5 .

[0038] Specifically, the ethanol output pipeline 13 is connected to a condenser 14 for quickly condensing and collecting the discharged ethanol vapor.

[0039] Specifically, all pipelines are corrosion-resistant metal pipes, which can be stainless steel pipes or pipelines with the inner pipes coated with corrosion-resistant coatings.

[0040] Specifically, all pipelines are equipped with valves so that the pipelines can be connected at any time.

[0041] Working principle:

[0042] After being vaporized by the front-stage reactor, the acidic aqueous ethanol vapor is directly connected to the first delivery pipeline 2 and is delivered to the distillation tower 1 through the first delivery pipeline 2. At this time, the valve on the delivery main pipeline is opened, and the delivery main pipeline delivers the sodium ethanol ethanol solution to the second delivery pipeline 4, and multiple sodium ethanol ethanol solutions are sprayed out from multiple spray heads 3. The sprayed sodium ethanol ethanol solution and the acidic aqueous ethanol vapor are reversely contacted in the distillation tower 1 and are quickly neutralized. The acidic aqueous ethanol vapor and the sodium ethanol ethanol solution are exchanged in gas and liquid in the distillation tower 1, the water content in the acidic aqueous ethanol vapor decreases, and the ethanol-water azeotrope rises, and is condensed and captured by the top condenser 14 of the distillation tower 1. A small amount of unneutralized ethanol water falls into the collecting tank 5 connected to the bottom of the distillation tower 1, and the unneutralized acidic aqueous ethanol solution reacts again with the small amount of sodium ethanol ethanol solution added, and vaporizes again after the reaction. Here, the bottom of the tower needs to control the collecting tank online at a neutral state through a pH meter to control the amount of the small amount of sodium ethanol ethanol solution added, so as to facilitate the collection tank 5 to discharge neutral salt water.

[0043] When the ethanol recovery device provided by the utility model is used, it is not necessary to condense the acidic aqueous ethanol vapor into liquid in the condenser, but the acidic aqueous ethanol vapor is directly sent into the distillation tower 1, and the acidic aqueous ethanol vapor is reversely contacted with the sodium ethanol ethanol solution sprayed from the top of the tower in the distillation tower 1 to perform gas-liquid exchange, so that the sodium ethanol ethanol solution absorbs the acidic aqueous ethanol vapor in the acidic aqueous ethanol vapor, so that the acidic aqueous ethanol vapor is liquefied, and then an acid-base neutralization reaction occurs with the falling sodium ethanol ethanol solution in the distillation tower, thereby generating a mixed solution of sodium chloride, ethanol and water, and a small amount of ethanol vapor is also liquefied in this process and falls into the collection tank together, while the low-boiling point ethanol vapor in the acidic aqueous ethanol vapor continues to rise and is output through the output pipeline 13, and the mixed solution of sodium chloride, ethanol and water falling into the collection tank 5 is re-gasified under the heating of the reboiler 9, which not only provides gas-liquid conditions for distillation, but also can re-gasify and collect ethanol. The equipment eliminates the need for one-time condensation of acidic aqueous ethanol vapor, and the neutralization and distillation react simultaneously, without wasting neutralization heat. It can continuously process acidic aqueous ethanol vapor and recover ethanol, thereby improving reaction efficiency and reducing energy consumption.

[0044] In the utility model, when the ratio of the sprayed sodium ethoxide ethanol solution and the acidic aqueous ethanol vapor fed into the distillation tower 1 is not enough for the acidic water vapor to be completely neutralized in the distillation tower, that is, a small amount of acidic water vapor does not react with the sodium ethoxide ethanol, the acidic water vapor will also be liquefied in the distillation tower, and then fall into the collecting tank and be collected. When the pH value in the collecting tank increases, the vaporized acidic gas will enter the distillation tower again, so it is necessary to observe the pH change in the collecting tank through the pH meter in the collecting tank, and add the sodium ethoxide ethanol solution in time to neutralize the excess acidic solution in the collecting tank to avoid affecting the normal progress of the distillation reaction.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An ethanol recovery device, characterized in that: include: A distillation tower (1) is connected to a first delivery pipeline (2) in the middle, the first delivery pipeline (2) is used to deliver acidic aqueous ethanol vapor, the top of the tower is connected to an output pipeline (13), the output pipeline (13) is used to deliver ethanol vapor, a second delivery pipeline (4) is horizontally arranged at the top of the distillation tower (1), the second delivery pipeline (4) is connected to a delivery main pipe arranged outside the distillation tower (1), and the delivery main pipe is used to deliver sodium ethanol ethanol solution; A collecting tank (5), which is disposed at the bottom of the distillation tower (1) and is connected to the bottom of the distillation tower (1), and is used to collect a mixed solution of sodium chloride, ethanol and water; A reboiler (9) is arranged outside the collecting tank (5), and the reboiler (9) has an inlet and an outlet. The inlet and the outlet of the reboiler (9) are respectively connected to the collecting tank (5) through pipelines. The reboiler (9) is used to re-vaporize the ethanol and water in the fed mixed solution of sodium chloride, ethanol and water.

2. An ethanol recovery device according to claim 1, characterized in that: The second delivery pipeline (4) is provided with a plurality of spray heads (3) for spraying the sodium ethoxide ethanol solution.

3. An ethanol recovery device according to claim 2, characterized in that: The liquid outlet directions of the plurality of spray heads (3) are vertically downward.

4. An ethanol recovery device according to claim 1, characterized in that: The output pipeline (13) is connected to a condenser (14).

5. An ethanol recovery device according to claim 1, characterized in that: A lift pump (7) is provided on the pipeline connected to the inlet of the reboiler (9), and a third delivery pipeline (12) is connected to the pipeline connected to the outlet of the reboiler (9). The third delivery pipeline (12) is communicated with the delivery main pipe, and the third delivery pipeline (12) is used to deliver the sodium ethanol ethanol solution.

6. An ethanol recovery device according to claim 4, characterized in that: The pipeline connected to the outlet of the reboiler (9) is also connected to a mixer (11).

7. An ethanol recovery device according to claim 1, characterized in that: A pH meter is provided in the collection tank (5), a controller is provided on the collection tank (5), and the pH meter is electrically connected to the controller.

8. An ethanol recovery device according to claim 7, characterized in that: The collection tank (5) is provided with a conductivity detector, the conductivity detector is electrically connected to the controller, and the collection tank (5) is provided with an external discharge pipeline.

9. An ethanol recovery device according to claim 1, characterized in that: All the pipelines mentioned are corrosion-resistant metal pipes.

10. An ethanol recovery device according to claim 1, characterized in that: All said pipelines are provided with valves.

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