Device for preparing furfuryl alcohol through furfural hydrogenation

Abstract

The utility model discloses a device for preparing furfuryl alcohol through furfural hydrogenation, which relates to the technical field of furfuryl alcohol production and comprises a reaction kettle and a discharge port, a drainage tube is arranged at the top of the reaction kettle, the other end of the drainage tube is connected with a collecting tank, a buffer tank is arranged on the outer side of the collecting tank, and the collecting tank is connected with the buffer tank through a connecting tube. A circulating air pipe is arranged at the top of the buffer tank, a system circulating pump is arranged on the outer side of the circulating air pipe, one end, penetrating through the system circulating pump, of the circulating air pipe is located in the discharging port, and a one-way valve is further arranged on the circulating air pipe. According to the device for preparing furfuryl alcohol through furfural hydrogenation, after the pressure in the reaction kettle reaches a certain value, the system circulating pump is started, hydrogen in the collecting tank collected through the connecting pipe in the buffer tank is pumped out through the circulating gas pipe and then fed into the reaction kettle for internal circulation, and hydrogen needed in hydrogenation reaction is recycled in the device, so that the production cost is reduced, and the production efficiency is improved. Therefore, the hydrogenation reaction is stably operated, and resources are saved.

Description

Technical Field

[0001] The utility model relates to the technical field of furfuryl alcohol production, in particular to a furfural hydrogenation device for producing furfuryl alcohol. Background Art

[0002] Furfural is an aldehyde compound, generally produced by acid hydrolysis of lignocellulose in plant substances, and is widely used in the pharmaceutical, agricultural and other chemical industries. It is mainly used to produce epoxy resins, plasticizers, and some drugs and spices.

[0003] Furfuryl alcohol is the product after hydrogenation of furfural. The existing Chinese patent with the authorization announcement number CN206553432U discloses an energy-saving production device for hydrogenating furfural to furfuryl alcohol. By setting multiple gas paths and water paths, and through the connected controller, multiple pressure gauges and control valves, and equipped with a filter, the adjustment can be more flexible, the circulating gas can be filtered cleanly, and the service life of the hydrogen compressor can be effectively extended.

[0004] Furfural reacts with hydrogen to produce furfuryl alcohol. This process requires a catalyst to promote the reaction. Hydrogenation reactions usually use metal catalysts. Hydrogen is flammable, so operations must be carried out in a closed and safe environment to avoid leakage. However, due to incomplete reaction conditions, when the reaction between furfural and hydrogen fails to proceed completely, it is easy to cause some hydrogen to be unconsumed, and the unconsumed hydrogen will be discharged into the storage tank, resulting in waste of resources. Summary of the Utility Model

[0005] In view of the problem in the above existing device that when the reaction between furfural and hydrogen fails to proceed completely due to incomplete reaction conditions, it is easy to cause some hydrogen to be unconsumed, and the unconsumed hydrogen will be discharged into the storage tank, resulting in waste of resources and increased production costs, the present utility model is proposed.

[0006] Therefore, the purpose of the present utility model is to provide a furfural hydrogenation device for producing furfuryl alcohol, and its purpose is to: draw out the hydrogen in the collection tank collected through the connecting pipe in the buffer tank through the circulating gas pipe and send it into the reaction kettle for internal circulation, reduce the waste of hydrogen, and save resources.

[0007] To solve the above technical problems, the present utility model provides the following technical solution: a furfural hydrogenation device for producing furfuryl alcohol, which includes a reaction kettle and a discharging port. The discharging port is located at the bottom of the reaction kettle. A drainage pipe is provided at the top of the reaction kettle, and the other end of the drainage pipe is connected to a collection tank. A buffer tank is provided outside the collection tank, and the collection tank and the buffer tank are connected by a connecting pipe;

[0008] A circulating gas pipe is provided at the top of the buffer tank, and a system circulating pump is provided outside the circulating gas pipe. One end of the circulating gas pipe passing through the system circulating pump is located in the discharging port;

[0009] A one-way valve is also provided on the circulating gas pipe.

[0010] As a preferred embodiment of the furfural hydrogenation to furfuryl alcohol device of the present utility model, wherein: a back pressure valve is also provided on the drainage pipe, a condenser is installed at one end of the drainage pipe close to the collection tank, and one end of the drainage pipe passing through the condenser is connected to the collection tank.

[0011] As a preferred embodiment of the furfural hydrogenation to furfuryl alcohol device of the present utility model, wherein: one end of the circulating gas pipe close to the discharge port is connected to a gas supply pipe, the circulating gas pipe is connected to a hydrogen gas joint through the gas supply pipe, and a one-way valve and a control valve are also provided at one end of the gas supply pipe connected to the circulating gas pipe.

[0012] As a preferred embodiment of the furfural hydrogenation to furfuryl alcohol device of the present utility model, wherein: one end of the reaction kettle close to the discharge port is connected to a liquid supply pipe, the discharge port is connected to a solution storage tank through the liquid supply pipe, and a one-way valve and a constant pressure and constant flow valve are also provided on the liquid supply pipe.

[0013] As a preferred embodiment of the furfural hydrogenation to furfuryl alcohol device of the present utility model, wherein: a flange cover is installed at one end of the reaction kettle away from the discharge port, a thermocouple and a pressure gauge are provided on the top of the flange cover, and one end of the pressure gauge is located in the reaction kettle.

[0014] As a preferred embodiment of the furfural hydrogenation to furfuryl alcohol device of the present utility model, wherein: an oil circulation chamber is provided outside the reaction kettle, a heating jacket is provided between the oil circulation chamber and the reaction kettle, a fuel supply pipe is provided inside the oil circulation chamber, the oil circulation chamber is connected to a main oil tank through the fuel supply pipe, and a control valve is also provided on the fuel supply pipe.

[0015] As a preferred embodiment of the furfural hydrogenation to furfuryl alcohol device of the present utility model, wherein: a circulating oil pipe is also provided in the oil circulation chamber, a oil pump is provided at one end of the circulating oil pipe passing through the oil circulation chamber, and one end of the circulating oil pipe passing through the oil pump is also located in the oil circulation chamber.

[0016] Advantages of the present utility model:

[0017] 1. After the pressure in the reaction kettle reaches a certain value, the system circulation pump is started, and the hydrogen gas in the collection tank collected through the connecting pipe in the buffer tank is pumped out through the circulating gas pipe and sent into the reaction kettle for internal circulation, so that the hydrogen gas required in the hydrogenation reaction is recycled in the device, making the hydrogenation combination reaction run stably and saving resources.

[0018] 2. The one-way valves on the circulating gas pipe connected through the buffer tank, the one-way valve on the gas supply pipe connected to the hydrogen joint, and the one-way valve on the liquid supply pipe connected to the solution storage tank simultaneously achieve the connection of the gas path and the water path, and can ensure that the gas and water will not flow back.

[0019] 3. Different catalysts can be added to the reaction kettle and combined with different solutions in the solution storage tank to produce corresponding products under different reaction conditions. It is not only used for the hydrogenation of furfural to furfuryl alcohol, but also can produce tetrahydrofurfuryl alcohol, methylfuran, methyltetrahydrofuran, etc. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts. Among them:

[0021] Figure 1 It is a schematic diagram of the overall structure of the furfural hydrogenation to furfuryl alcohol device of the present invention.

[0022] Figure 2 It is a schematic diagram of the relevant structures of the reaction kettle and the buffer tank of the furfural hydrogenation to furfuryl alcohol device of the present invention.

[0023] Figure 3 It is a schematic diagram of the relevant structures of the reaction kettle, the hydrogen storage tank and the solution storage tank of the furfural hydrogenation to furfuryl alcohol device of the present invention.

[0024] Figure 4 It is for the furfural hydrogenation to furfuryl alcohol device of the present invention Figure 2 The enlarged schematic diagram of part A.

[0025] Figure 5 It is a schematic sectional view of the relevant structures of the reaction kettle and the oil circulation tank of the furfural hydrogenation to furfuryl alcohol device of the present invention.

[0026] Description of the Reference Numerals:

[0027] 1. Reaction kettle; 2. Discharge port; 3. Drainage pipe; 4. Collection tank; 5. Buffer tank; 6. Connecting pipe; 7. Circulating gas pipe; 8. System circulation pump; 9. One-way valve; 10. Back pressure valve; 11. Condenser; 12. Gas supply pipe; 13. Hydrogen joint; 14. Constant pressure and constant flow valve; 15. Control valve; 16. Liquid supply pipe; 17. Solution storage tank; 18. Flange cover; 19. Thermocouple; 20. Pressure gauge; 21. Oil circulation tank; 22. Heating jacket; 23. Oil supply pipe; 24. Main oil tank; 25. Circulating oil pipe; 26. Oil pump. Detailed Embodiments

[0028] To make the above objects, features, and advantages of the present utility model more apparent and understandable, the following provides a detailed description of the specific embodiments of the present utility model in conjunction with the accompanying drawings of the specification. Embodiment

[0029] Referring to Figures 1-5 , which is the first embodiment of the present utility model, a furfural hydrogenation to furfuryl alcohol device is provided. This furfural hydrogenation to furfuryl alcohol device includes a reaction kettle 1 and a discharge port 2. The discharge port 2 is located at the bottom of the reaction kettle 1. A drainage pipe 3 is provided at the top of the reaction kettle 1. The other end of the drainage pipe 3 is connected to a collection tank 4. A buffer tank 5 is provided outside the collection tank 4. The collection tank 4 and the buffer tank 5 are connected by a connecting pipe 6. A circulating gas pipe 7 is provided at the top of the buffer tank 5. A system circulating pump 8 is provided outside the circulating gas pipe 7. One end of the circulating gas pipe 7 passing through the system circulating pump 8 is located in the discharge port 2. A check valve 9 is also provided on the circulating gas pipe 7. Various catalysts for promoting the hydrogenation reaction can be added to the reaction kettle 1. The discharge port 2 can discharge the waste products after the reaction. The drainage pipe 3 can send the furfuryl alcohol and part of the unreacted hydrogen generated in the reaction kettle 1 into the collection tank 4. The collection tank 4 can discharge the hydrogen into the buffer tank 5 through the connecting pipe 6. The system circulating pump 8 can provide power for the circulating gas pipe 7, draw out the hydrogen in the buffer tank 5 and send it into the discharge port 2. The check valve 9 can ensure that the direction of hydrogen transportation in the circulating gas pipe 7 is always from the buffer tank 5 to the discharge port 2, so as to send the unconsumed hydrogen into the discharge port 2 for reuse, avoid hydrogen waste, and reduce production costs.

[0030] A back pressure valve 10 is also provided on the drainage pipe 3. A condenser 11 is installed at one end of the drainage pipe 3 close to the collection tank 4. One end of the drainage pipe 3 passing through the condenser 11 is connected to the collection tank 4. The back pressure valve 10 can prevent the products transported in the drainage pipe 3 from flowing back into the reaction kettle 1. The condenser 11 can condense the hydrogenation reaction products, so as to facilitate the separation and collection of hydrogen and furfuryl alcohol products.

[0031] One end of the circulating gas pipe 7 close to the discharge port 2 is connected to a gas supply pipe 12. The circulating gas pipe 7 is connected to a hydrogen connector 13 through the gas supply pipe 12. A check valve 9 and a control valve 15 are also provided at the end of the gas supply pipe 12 connected to the circulating gas pipe 7. The gas supply pipe 12 can send the hydrogen connected to the hydrogen connector 13 into the reaction kettle 1 connected to the circulating gas pipe 7. The pressure stabilizing and constant flow valve 14 on the gas supply pipe 12 can ensure the stable transportation of hydrogen. The control valve 15 on the gas supply pipe 12 can control the on-off of the gas supply pipe 12. The check valve 9 on the gas supply pipe 12 can ensure that the direction of the gas transported by the gas supply pipe 12 is always from the hydrogen connector 13 to the circulating gas pipe 7.

[0032] One end of the reactor 1 close to the discharge port 2 is connected with a liquid supply pipe 16. The discharge port 2 is connected with a solution storage tank 17 through the liquid supply pipe 16. A one-way valve 9 and a constant pressure and constant flow valve 14 are also arranged on the liquid supply pipe 16. The liquid supply pipe 16 can send furfural in the solution storage tank 17 into the discharge port 2. The constant pressure and constant flow valve 14 on the liquid supply pipe 16 can ensure the stable transportation of the solution. The one-way valve 9 on the liquid supply pipe 16 can ensure that the direction of the solution transported by the gas supply pipe 12 is always from the solution storage tank 17 to the discharge port 2, thus avoiding the backflow of the solution.

[0033] A flange cover 18 is installed at one end of the reactor 1 far from the discharge port 2. A thermocouple 19 and a pressure gauge 20 are arranged at the top of the flange cover 18. One end of the pressure gauge 20 is located in the reactor 1. The thermocouple 19 can create suitable temperature conditions for the reaction in the discharge port 2, generally between 100 - 200 °C. The pressure gauge 20 can facilitate the observation of the pressure change in the discharge port 2, so as to more intuitively observe the reaction state.

[0034] An oil circulation chamber 21 is arranged outside the reactor 1. A heating jacket 22 is arranged between the oil circulation chamber 21 and the reactor 1. An oil supply pipe 23 is arranged inside the oil circulation chamber 21. The oil circulation chamber 21 is connected with a main oil chamber 24 through the oil supply pipe 23. A control valve 15 is also arranged on the oil supply pipe 23. The oil circulation chamber 21 completely wraps the reactor 1. The heating jacket 22 can make the heat distribution in the discharge port 2 uniform. The oil supply pipe 23 can send the heat-conducting oil in the main oil chamber 24 into the oil circulation chamber 21.

[0035] A circulation oil pipe 25 is also arranged in the oil circulation chamber 21. One end of the circulation oil pipe 25 passing through the oil circulation chamber 21 is provided with an oil pump 26. One end of the circulation oil pipe 25 passing through the oil pump 26 is also located in the oil circulation chamber 21. The circulation oil pipe 25 can pump out the heat-conducting oil in the oil circulation chamber 21 through the oil pump 26 and then re-send it into the oil circulation chamber 21, so that the heat-conducting oil in the oil circulation chamber 21 is in a flowing state, ensuring the heating effect on the reaction in the reactor 1.

[0036] Before the experiment runs, it is necessary to turn on the oil pump 26 so that the heat-conducting oil transported by the main oil tank 24 through the oil supply pipe 23 undergoes external circulation in the oil circulation tank 21 outside the reaction kettle 1. Turn on the heating jacket 22 connected to the thermocouple 19 to preheat the device. After the preheating is completed, turn on the pressure-stabilizing and constant-flow valve 14 on the liquid supply pipe 16, and inject the furfural solution in the solution storage tank 17 into the reaction kettle 1 equipped with a specific catalyst. After the liquid flows out from the drainage pipe 3, start to open the control valve 15 on the gas supply pipe 12. After adjusting the flowmeter, start to introduce hydrogen connected to the hydrogen connector 13. Adjust the back pressure valve 10 on the drainage pipe 3, and observe the change in the value of the pressure gauge 20. When the pressure in the reaction kettle 1 reaches a certain value, close the control valve 15 on the gas supply pipe 12, turn on the system circulation pump 8, and draw out the hydrogen in the collection tank 4 collected through the connecting pipe 6 in the buffer tank 5 through the circulation gas pipe 7 and send it into the reaction kettle 1 for internal circulation, so that the hydrogen required in the hydrogenation reaction is recycled in the device, making the hydrogenation combination reaction run stably, saving resources, and during this process, turn on the condenser 11 to condense the hydrogenation combination reaction products, and send the reaction products and unconsumed hydrogen into the collection tank 4. At the same time, the check valves 9 on the circulation gas pipe 7 connected to the buffer tank 5, the check valves 9 on the gas supply pipe 12 connected to the hydrogen connector 13, and the check valves 9 on the liquid supply pipe 16 connected to the solution storage tank 17 are used to simultaneously realize the connection of the gas path and the water path, and it can ensure that the gas and water will not flow back. When the hydrogen in the reaction kettle 1 in the closed environment is lower than a certain value, hydrogen needs to be supplemented. At this time, it is necessary to open the control valve 15 on the gas supply pipe 12 to supplement the gas. The entire experiment is not limited to the hydrogenation of furfural to furfuryl alcohol. Different catalysts can be added to the reaction kettle 1 and combined with different solutions in the solution storage tank 17 to produce corresponding products under different reaction conditions, which can be used not only for the hydrogenation of furfural to furfuryl alcohol, but also for the production of tetrahydrofurfuryl alcohol, methylfuran, methyltetrahydrofuran, etc.

[0037] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered within the scope of the claims of the present invention.

Claims

1. A furfural hydrogenation to furfuryl alcohol device, comprising a reaction kettle (1) and a discharging port (2), the discharging port (2) being located at the bottom of the reaction kettle (1), characterized in that: A drain pipe (3) is provided at the top of the reactor (1), and the other end of the drain pipe (3) is connected to a collection tank (4). A buffer tank (5) is provided outside the collection tank (4), and the collection tank (4) and the buffer tank (5) are connected by a connecting pipe (6). A circulating gas pipe (7) is provided at the top of the buffer tank (5). A system circulating pump (8) is provided outside the circulating gas pipe (7), and one end of the circulating gas pipe (7) passing through the system circulating pump (8) is located in the discharge port (2). A check valve (9) is also provided on the circulating gas pipe (7).

2. The furfural hydrogenation to furfuryl alcohol device according to claim 1, characterized in that: A back pressure valve (10) is also provided on the drain pipe (3). A condenser (11) is installed at one end of the drain pipe (3) close to the collection tank (4), and one end of the drain pipe (3) passing through the condenser (11) is connected to the collection tank (4).

3. The furfural hydrogenation to furfuryl alcohol device according to claim 1, characterized in that: One end of the circulating gas pipe (7) close to the discharge port (2) is connected to a gas supply pipe (12). The circulating gas pipe (7) is connected to a hydrogen joint (13) through the gas supply pipe (12). A check valve (9) and a control valve (15) are also provided at the end where the gas supply pipe (12) is connected to the circulating gas pipe (7).

4. A furfural hydrogenation to furfuryl alcohol device according to claim 3, characterized in that: One end of the reactor (1) close to the discharge port (2) is connected to a liquid supply pipe (16). The discharge port (2) is connected to a solution storage tank (17) through the liquid supply pipe (16). A check valve (9) and a constant pressure and constant flow valve (14) are also provided on the liquid supply pipe (16).

5. The furfural hydrogenation to furfuryl alcohol device according to claim 1, characterized in that: A flange cover (18) is installed at one end of the reactor (1) away from the discharge port (2). A thermocouple (19) and a pressure gauge (20) are provided at the top of the flange cover (18), and one end of the pressure gauge (20) is located in the reactor (1).

6. The furfural hydrogenation to furfuryl alcohol device according to claim 5, characterized in that: An oil circulation chamber (21) is provided outside the reactor (1). A heating jacket (22) is provided between the oil circulation chamber (21) and the reactor (1). An oil supply pipe (23) is provided inside the oil circulation chamber (21). The oil circulation chamber (21) is connected to a main oil tank (24) through the oil supply pipe (23). A control valve (15) is also provided on the oil supply pipe (23).

7. The furfural hydrogenation to furfuryl alcohol device according to claim 6, characterized in that: A circulating oil pipe (25) is also provided in the oil circulation chamber (21). One end of the circulating oil pipe (25) passing through the oil circulation chamber (21) is provided with an oil pump (26), and one end of the circulating oil pipe (25) passing through the oil pump (26) is also located in the oil circulation chamber (21).

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