Continuous kettle and fixed bed reactor coupled crude tetrahydrofuran preparation device

Abstract

The utility model discloses a continuous kettle and fixed bed reactor coupled crude tetrahydrofuran preparation device which comprises a support, the upper surface of the support is fixedly connected with two sections of first conveying pipes, the two sections of first conveying pipes are distributed front and back, a feeding pump is fixedly connected between the two sections of first conveying pipes, and the two sections of first conveying pipes are connected with a fixed bed reactor. A fixed bed reactor body is fixedly connected to the end, away from the feeding pump, of the first material conveying pipe in the front, a second material conveying pipe is fixedly connected to the upper surface of the fixed bed reactor body, and a heating continuous kettle body is fixedly connected to the end, away from the fixed bed reactor body, of the second material conveying pipe; the upper surface of the heating continuous kettle body is fixedly connected with a motor, the output end of the motor is fixedly connected with a stirrer, ungasified raw materials and fresh raw materials are mixed through the arrangement of a one-way valve, a filter, a third conveying pipe and a circulating pump, the freshness degree of the 1, 4-butanediol raw materials is guaranteed, preparation quality is improved, meanwhile, preparation can be continuously carried out, and the production efficiency is improved. The working efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of crude tetrahydrofuran preparation, in particular to a crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor. Background Art

[0002] Tetrahydrofuran is an important organic chemical raw material. Due to its high polarity, low boiling point and low toxicity, the existing tetrahydrofuran production equipment uses a two-stage reaction to achieve the production of tetrahydrofuran under mild catalyst and process conditions without generating by-products. In addition, by controlling the temperature at the top of the distillation tower, it is ensured that the obtained tetrahydrofuran product contains only water. The product separation process is also equivalent to a two-stage process. The use of a solid catalyst simplifies the separation process of the product and the raw material, and the product has high purity. However, the existing preparation device is always heated to gasification in the reactor. As the reaction continues, the 1,4-butanediol at the bottom of the reactor is too long and not fresh enough.

[0003] After searching, it was found that the technical solution provided by the patent with application number CN202011132403.3 also has the above-mentioned problems. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art, and provides a crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, wherein a one-way valve, a filter, a third feed pipe, and a circulation pump are provided to mix ungasified raw materials with fresh raw materials, thereby ensuring the freshness of the 1,4-butanediol raw materials, improving the preparation quality, and making the preparation sustainable, thereby improving the work efficiency.

[0005] To achieve the above-mentioned purpose, the utility model also provides a crude tetrahydrofuran preparation device having a continuous kettle coupled with a fixed bed reactor, comprising: a bracket, a first feed pipe is fixedly connected to the upper surface of the bracket, the first feed pipe is in two sections and distributed front and back, a feed pump is fixedly connected between the two sections of the first feed pipe, one end of the first feed pipe in front away from the feed pump is fixedly connected to a fixed bed reactor body, a second feed pipe is fixedly connected to the upper surface of the fixed bed reactor body, one end of the second feed pipe away from the fixed bed reactor body is fixedly connected to a heating continuous kettle body, a motor is fixedly connected to the upper surface of the heating continuous kettle body, and an agitator is fixedly connected to the output end of the motor;

[0006] An air delivery pipe is fixedly connected to the upper surface of the heating continuous kettle body. The air delivery pipe has three sections and is distributed up and down. A condenser is fixedly connected between the upper two sections of the air delivery pipe, and a condensate tank is fixedly connected between the lower two sections of the air delivery pipe. The end of the air delivery pipe away from the condensate tank is fixedly connected to a crude tetrahydrofuran discharge pump. A third delivery pipe is fixedly connected to the lower surface of the heating continuous kettle body. The third delivery pipe has two sections and is distributed left and right. A circulation pump is fixedly connected between the two third delivery pipes, and a one-way valve is fixedly connected to the end of the left third delivery pipe away from the circulation pump. By arranging the one-way valve, the filter, the third delivery pipe, and the circulation pump, the ungasified raw materials are mixed with the fresh raw materials to ensure the freshness of the 1,4-butanediol raw material, improve the preparation quality, and make the preparation sustainable, thereby improving work efficiency.

[0007] According to the crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, a feeding port is provided at one end of the rear first feed pipe away from the feed pump, and the lower surface of the fixed bed reactor body is fixedly connected to the bracket.

[0008] According to the crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, the outer surface of the stirrer is rotatably connected to the heating continuous kettle body, and the lower surface of the heating continuous kettle body is fixedly connected to the bracket.

[0009] According to the crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, the number of the filters is four and they are distributed on the left and right, the inner surface of the third filter on the left is fixedly connected to the second feed pipe, and multi-stage filtration improves the preparation quality.

[0010] According to the crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, the lower surface of the condenser is fixedly connected to the bracket, and the interior of the condensate tank is connected to the condenser.

[0011] According to the crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, the output end of the crude tetrahydrofuran discharge pump is provided with a discharge port, and the lower surface of the crude tetrahydrofuran discharge pump is fixedly connected to a bracket.

[0012] According to the crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, the inner surface of the filter on the right side is fixedly connected to the third feed pipe, and the upper surface of the filter on the right side is fixedly connected to the heated continuous kettle body.

[0013] According to the crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, the outer surface of the one-way valve is fixedly connected to the first feed pipe, and the feed pump, the heating continuous kettle body, the motor, the condenser, the crude tetrahydrofuran discharge pump, and the circulation pump are all electrically connected to an external power supply.

[0014] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments;

[0016] Figure 1 This is an overall structural diagram of a crude tetrahydrofuran preparation device of the utility model, which is a continuous kettle coupled with a fixed bed reactor;

[0017] Figure 2 for Figure 1 A magnified view of the structure at center A;

[0018] Figure 3 It is a partial structural schematic diagram of a crude tetrahydrofuran preparation device of the utility model, which is a continuous kettle coupled with a fixed bed reactor;

[0019] Figure 4 The utility model is a schematic diagram of the use of a crude tetrahydrofuran preparation device in which a continuous kettle and a fixed bed reactor are coupled.

[0020] Legend:

[0021] 1. Bracket; 2. Feeding port; 3. Filter; 4. Feed pump; 5. First feed pipe; 6. One-way valve; 7. Fixed bed reactor body; 8. Heating continuous kettle body; 9. Motor; 10. Agitator; 11. Gas pipe; 12. Condenser; 13. Condensate tank; 14. Crude tetrahydrofuran discharge pump; 15. Discharge port; 16. Second feed pipe; 17. Third feed pipe; 18. Circulation pump. DETAILED DESCRIPTION

[0022] This section will describe in detail the specific embodiments of the utility model. The preferred embodiments of the utility model are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the utility model, but it cannot be understood as a limitation on the protection scope of the utility model.

[0023] Reference Figure 1-4The present invention provides a crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, which comprises: a bracket 1, a first feed pipe 5 is fixedly connected to the upper surface of the bracket 1, the first feed pipe 5 is divided into two sections and distributed front and back, a feed pump 4 is fixedly connected between the two sections of the first feed pipe 5, a feed port 2 is arranged at one end of the rear first feed pipe 5 away from the feed pump 4, a fixed bed reactor body 7 is fixedly connected to one end of the front first feed pipe 5 away from the feed pump 4, the lower surface of the fixed bed reactor body 7 is fixedly connected to the bracket 1, and the fixed bed A second feed pipe 16 is fixedly connected to the upper surface of the reactor body 7. There are four filters 3 distributed on the left and right. The inner surface of the third filter 3 on the left is fixedly connected to the second feed pipe 16. The end of the second feed pipe 16 away from the fixed bed reactor body 7 is fixedly connected to the heating continuous kettle body 8. The lower surface of the heating continuous kettle body 8 is fixedly connected to the bracket 1. The upper surface of the heating continuous kettle body 8 is fixedly connected to the motor 9. The output end of the motor 9 is fixedly connected to the stirrer 10. The outer surface of the stirrer 10 is rotatably connected to the heating continuous kettle body 8.

[0024] The upper surface of the heating continuous kettle body 8 is fixedly connected with a gas pipe 11, the number of the gas pipe 11 is three sections and is distributed up and down, a condenser 12 is fixedly connected between the upper two sections of the gas pipe 11, the lower surface of the condenser 12 is fixedly connected to the bracket 1, and a condensate tank 13 is fixedly connected between the lower two sections of the gas pipe 11, the interior of the condensate tank 13 is connected to the condenser 12, and the end of the gas pipe 11 away from the condensate tank 13 is fixedly connected to a crude tetrahydrofuran discharge pump 14, and the output end of the crude tetrahydrofuran discharge pump 14 is provided with a discharge port 15, and the lower surface of the crude tetrahydrofuran discharge pump 14 is fixedly connected to the bracket 1, and the heating continuous kettle body 8 is fixedly connected to a third feed pipe 17 on the lower surface, the inner surface of the right filter 3 is fixedly connected to the third feed pipe 17, the upper surface of the right filter 3 is fixedly connected to the heating continuous kettle body 8, there are two third feed pipes 17 and they are distributed on the left and right, a circulation pump 18 is fixedly connected between the two third feed pipes 17, and a one-way valve 6 is fixedly connected to the end of the left third feed pipe 17 away from the circulation pump 18, the outer surface of the one-way valve 6 is fixedly connected to the first feed pipe 5, the feed pump 4, the heating continuous kettle body 8, the motor 9, the condenser 12, the crude tetrahydrofuran discharge pump 14, and the circulation pump 18 are all electrically connected to an external power supply.

[0025] Working principle: fresh 1,4-butanediol filtered by filter 3 is mixed with hot kettle liquid in heating continuous kettle body 8 through feed pump 4 and then enters fixed bed reactor body 7 through another filter 3 below. Under the action of catalyst in fixed bed reactor body 7, 1,4-butanediol is intramolecularly dehydrated and cyclized to produce tetrahydrofuran and water, and a reaction liquid containing tetrahydrofuran, water and 1,4-butanediol is obtained, and enters heating continuous kettle body 8 for heating. After heating, most of water and tetrahydrofuran in the reaction liquid are rapidly vaporized and enter condenser 12. After condensation by condenser 12, crude tetrahydrofuran is obtained, which enters condensate tank 13 and is discharged through crude tetrahydrofuran discharge pump 14. Unvaporized 1,4-butanediol, water and tetrahydrofuran form kettle liquid of continuous kettle. A large amount of kettle liquid is then mixed with fresh 1,4-butanediol through circulation pump 18, and a small amount of kettle liquid is discharged through kettle liquid discharge pump at the other end.

[0026] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A crude tetrahydrofuran preparation device coupled with a continuous kettle and a fixed bed reactor, characterized in that: include: A bracket (1), wherein a first feed pipe (5) is fixedly connected to the upper surface of the bracket (1), the first feed pipe (5) is in two sections and distributed front and back, a feed pump (4) is fixedly connected between the two sections of the first feed pipe (5), the front end of the first feed pipe (5) away from the feed pump (4) is fixedly connected to a fixed bed reactor body (7), the upper surface of the fixed bed reactor body (7) is fixedly connected to a second feed pipe (16), the end of the second feed pipe (16) away from the fixed bed reactor body (7) is fixedly connected to a heating continuous kettle body (8), the upper surface of the heating continuous kettle body (8) is fixedly connected to a motor (9), and the output end of the motor (9) is fixedly connected to a stirrer (10); The upper surface of the heating continuous kettle body (8) is fixedly connected with a gas delivery pipe (11), the number of the gas delivery pipe (11) is three and they are distributed up and down, a condenser (12) is fixedly connected between the upper two sections of the gas delivery pipe (11), a condensate tank (13) is fixedly connected between the lower two sections of the gas delivery pipe (11), the end of the gas delivery pipe (11) away from the condensate tank (13) is fixedly connected with a crude tetrahydrofuran discharge pump (14), the lower surface of the heating continuous kettle body (8) is fixedly connected with a third material delivery pipe (17), the number of the third material delivery pipe (17) is two and they are distributed left and right, a circulation pump (18) is fixedly connected between the two third material delivery pipes (17), and the end of the left third material delivery pipe (17) away from the circulation pump (18) is fixedly connected with a one-way valve (6).

2. The crude tetrahydrofuran preparation device of a continuous kettle coupled with a fixed bed reactor according to claim 1, characterized in that: A feeding port (2) is provided at one end of the first feed pipe (5) at the rear, away from the feed pump (4), and the lower surface of the fixed bed reactor body (7) is fixedly connected to the bracket (1).

3. The crude tetrahydrofuran preparation device of a continuous kettle coupled with a fixed bed reactor according to claim 1, characterized in that: The outer surface of the stirrer (10) is rotatably connected to the heating continuous kettle body (8), and the lower surface of the heating continuous kettle body (8) is fixedly connected to the bracket (1).

4. The crude tetrahydrofuran preparation device of a continuous kettle coupled with a fixed bed reactor according to claim 1, characterized in that: There are four filters (3) distributed on the left and right sides, and the inner surface of the third filter (3) on the left side is fixedly connected to the second material delivery pipe (16).

5. The crude tetrahydrofuran preparation device of a continuous kettle coupled with a fixed bed reactor according to claim 1, characterized in that: The lower surface of the condenser (12) is fixedly connected to the bracket (1), and the interior of the condensate tank (13) is connected to the condenser (12).

6. The crude tetrahydrofuran preparation device of a continuous kettle coupled with a fixed bed reactor according to claim 1, characterized in that: The output end of the crude tetrahydrofuran discharge pump (14) is provided with a discharge port (15), and the lower surface of the crude tetrahydrofuran discharge pump (14) is fixedly connected to the bracket (1).

7. The crude tetrahydrofuran preparation device of a continuous kettle coupled with a fixed bed reactor according to claim 4, characterized in that: The inner surface of the filter (3) on the right side is fixedly connected to the third material delivery pipe (17), and the upper surface of the filter (3) on the right side is fixedly connected to the heating continuous kettle body (8).

8. The crude tetrahydrofuran preparation device of a continuous kettle coupled with a fixed bed reactor according to claim 1, characterized in that: The outer surface of the one-way valve (6) is fixedly connected to the first feed pipe (5), and the feed pump (4), the heating continuous kettle body (8), the motor (9), the condenser (12), the crude tetrahydrofuran discharge pump (14), and the circulation pump (18) are all electrically connected to an external power supply.

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