Evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid

Abstract

The utility model discloses an evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid, which comprises an evaporation tank, and the top of the evaporation tank is fixedly connected with a cover plate through bolts. According to the utility model, the first heating jacket is started to heat a solvent in the evaporation tank, the motor rotates to drive the stirring rod to rotate so as to stir the solvent in the evaporation tank, and an operator starts the air pump to convey gas in the evaporation tank into external equipment, so that the air pressure in the evaporation tank is reduced; meanwhile, an operator can start a conveying pump to convey the solvent in the evaporation tank into a spiral pipe, and start a second heating jacket to convey the heated solvent into the evaporation tank again, so that the solvent in the evaporation tank is effectively heated, and the evaporation efficiency of the solvent in the evaporation tank is improved. Therefore, the evaporation efficiency of the solvent in the evaporation tank is improved, and the device has the advantage of high evaporation efficiency.

Description

Technical Field

[0001] This utility model relates to the field of evaporation technology, specifically to an evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid. Background Technology

[0002] The synthesis of 2-acrylamido-2-methylpropanesulfonic acid can be divided into one-step and two-step methods. The one-step method involves reacting acrylonitrile, isobutylene, and fuming sulfuric acid together at an appropriate temperature, followed by separation of the product 2-acrylamido-2-methylpropanesulfonic acid. The two-step method involves first sulfonating isobutylene with fuming sulfuric acid or SO3 at low temperature in the presence of a reaction solvent to obtain a sulfonated intermediate, which is then reacted with acrylonitrile in the presence of sulfuric acid, followed by separation of the product 2-acrylamido-2-methylpropanesulfonic acid. Both methods require an excess of acrylonitrile as a solvent. In the synthesis of 2-acrylamido-2-methylpropanesulfonic acid, selecting a suitable evaporator is crucial for the quality and recovery rate of acrylonitrile.

[0003] Currently, domestic distillation is carried out using a 10m³ jacketed vessel. This method typically involves transferring 5t of material into the jacketed vessel at once, heating it through the jacket, and distilling it under vacuum. The drawbacks of this method are the long residence time of the material, generally around 10 hours, the inability to control the polymerization of acrylonitrile, and the low evaporation rate, approximately 0.5t per hour under the same recovery process. Therefore, it is necessary to design and modify the evaporator used for the production of 2-acrylamido-2-methylpropanesulfonic acid to effectively prevent the low evaporation efficiency. Utility Model Content

[0004] To address the problems mentioned in the background art, the purpose of this utility model is to provide an evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid, which has the advantage of high evaporation efficiency. This solves the problem that currently, domestic distillation is carried out using a jacketed 10m³ kettle. This method typically involves transferring 5t of material into the jacketed kettle at once, heating it through the jacket, and distilling it under vacuum. The drawbacks of this method are that the material residence time is long, generally around 10 hours, the polymerization of acrylonitrile cannot be controlled, and the evaporation rate is small, approximately 0.5t per hour under the same recovery process.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid, comprising an evaporating tank, a cover plate fixedly connected to the top of the evaporating tank by bolts, a stirring rod rotatably connected inside the cover plate, the stirring rod being in contact with the evaporating tank, a first motor fixedly connected to the top of the cover plate, the output end of the first motor being fixedly connected to the stirring rod, a feed pipe connected to the top of the cover plate, a sealing cap fixedly connected to the top of the feed pipe by bolts, an air pump connected to the top of the cover plate, a first heating jacket fixedly connected to the surface of the evaporating tank, a delivery pump connected to the bottom of the evaporating tank, a heating tube fixedly connected to the surface of the evaporating tank by a bracket, a second heating jacket fixedly connected to the surface of the heating tube, a spiral tube fixedly connected inside the heating tube, a pipe connecting the outlet of the delivery pump to the inlet of the spiral tube, a circulation inlet pipe connected to the surface of the evaporating tank, and a pipe connecting the outlet of the spiral tube to the circulation inlet pipe.

[0006] As a preferred embodiment of this invention, a scraper frame is fixedly connected to the surface of the stirring rod. The scraper frame is in contact with the inner wall of the evaporator. There are several scraper frames, which are evenly distributed in a ring on the surface of the stirring rod.

[0007] As a preferred embodiment of this invention, the surface of the stirring rod is fixedly connected with conveying blades, and the number of conveying blades is several.

[0008] In a preferred embodiment of this invention, a movable column is fixedly connected to the surface of the first heating jacket, a support column is slidably connected to the surface of the movable column, a screw is threaded into the inside of the support column, a number of through openings are provided on the surface of the movable column, the screw is inserted into the through opening, and the surface of the screw is coated with anti-rust paint.

[0009] As a preferred embodiment of this invention, the surface of the evaporator is fixedly connected with several lifting lugs, which are evenly distributed in a ring on the surface of the evaporator.

[0010] As a preferred embodiment of this invention, both the surface of the first heating jacket and the second heating jacket are fixedly connected with an insulation layer.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0012] 1. This utility model employs a first heating jacket to heat the solvent in the evaporator. The rotation of the motor drives the stirring rod to rotate, thereby stirring the solvent in the evaporator. The operator starts the air pump to transport the gas in the evaporator to external equipment, thereby reducing the gas pressure in the evaporator and improving the evaporation efficiency of the solvent. Simultaneously, the operator can start the transfer pump to transport the solvent in the evaporator to the spiral tube. The operator then starts the second heating jacket, and the heated solvent is transferred back to the evaporator, effectively heating the solvent in the evaporator and further improving the evaporation efficiency. This device has the advantage of high evaporation efficiency.

[0013] 2. This utility model, through the setting of the scraper frame, the rotation of the stirring rod drives the scraper frame to rotate, thereby scraping off the material accumulated on the inner wall of the evaporator, and at the same time, it can stir the material in the evaporator, thereby improving the evaporation efficiency of the material in the evaporator. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this utility model;

[0015] Figure 2 This is a front sectional view of the evaporator and heating tube structure of this utility model;

[0016] Figure 3 This utility model Figure 1 Enlarged schematic diagram of the structure at point A in the middle;

[0017] Figure 4 This utility model Figure 1 Enlarged schematic diagram of the structure at point B.

[0018] In the diagram: 1. Evaporator; 2. Cover plate; 3. Stirring rod; 4. Motor; 5. Feed pipe; 6. Sealing cover; 7. Air pump; 8. First heating jacket; 9. Conveying pump; 10. Heating tube; 11. Second heating jacket; 12. Spiral tube; 13. Circulation inlet pipe; 14. Scraper frame; 15. Conveying blades; 16. Movable column; 17. Support column; 18. Through port; 19. Screw; 20. Lifting lug. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] like Figures 1 to 4As shown, an evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid includes an evaporator tank 1. A cover plate 2 is bolted to the top of the evaporator tank 1. A stirring rod 3 is rotatably connected inside the cover plate 2 and fits against the evaporator tank 1. A first motor 4 is fixedly connected to the top of the cover plate 2, and the output end of the first motor 4 is fixedly connected to the stirring rod 3. A feed pipe 5 is connected to the top of the cover plate 2, and a sealing cover 6 is bolted to the top of the feed pipe 5. An air pump 7 is connected to the top of the cover plate 2. A first heating jacket 8 is fixedly connected to the surface of the evaporator tank 1. A delivery pump 9 is connected to the bottom of the evaporator tank 1. A heating tube 10 is fixedly connected to the surface of the evaporator tank 1 via a bracket. A second heating jacket 11 is fixedly connected to the surface of the heating tube 10. A spiral tube 12 is fixedly connected inside the heating tube 10. The outlet of the delivery pump 9 and the inlet of the spiral tube 12 are connected via a pipe. A circulation inlet pipe 13 is connected to the surface of the evaporator tank 1, and the outlet of the spiral tube 12 is connected to the circulation inlet pipe 13 via a pipe.

[0021] refer to Figure 2 A scraper frame 14 is fixedly connected to the surface of the stirring rod 3. The scraper frame 14 is in contact with the inner wall of the evaporator 1. There are several scraper frames 14, which are evenly distributed in a ring on the surface of the stirring rod 3.

[0022] As a technical optimization of this utility model, by setting up the scraper frame 14, the rotating stirring rod 3 drives the scraper frame 14 to rotate, thereby scraping off the material accumulated on the inner wall of the evaporator 1, and at the same time stirring the material in the evaporator 1, thereby improving the evaporation efficiency of the material in the evaporator 1.

[0023] refer to Figure 2 The surface of the stirring rod 3 is fixedly connected with conveying blades 15, and the number of conveying blades 15 is several.

[0024] As a technical optimization of this utility model, by setting the conveying blade 15, the stirring rod 3 rotates and drives the conveying blade 15 to rotate, thereby turning over the material in the evaporator 1, thereby improving the evaporation efficiency of the material in the evaporator 1.

[0025] refer to Figure 1 and Figure 4 The surface of the first heating jacket 8 is fixedly connected to a movable column 16, and the surface of the movable column 16 is slidably connected to a support column 17. The internal thread of the support column 17 is connected to a screw 19. The surface of the movable column 16 has several through holes 18. The screw 19 is inserted into the through holes 18, and the surface of the screw 19 is coated with anti-rust paint.

[0026] As a technical optimization of this utility model, by setting up the movable column 16, the support column 17, the through port 18 and the screw 19, the operator can move the movable column 16 up and down, thereby driving the first heating jacket 8 and the evaporator 1 to move up or down. When the movable column 16 moves to a suitable height, the operator tightens the screw 19 so that the screw 19 is inserted into the through port 18, thereby locking the height of the movable column 16.

[0027] refer to Figures 1 to 3 The surface of the evaporator 1 is fixedly connected with a number of lifting lugs 20, which are evenly distributed in a ring on the surface of the evaporator 1.

[0028] As a technical optimization of this utility model, the lifting lug 20 makes it easier for the operator to lift the device and transport it.

[0029] refer to Figure 1 and Figure 2 Both the surface of the first heating jacket 8 and the second heating jacket 11 are fixedly connected with an insulation layer.

[0030] As a technical optimization of this utility model, by setting up an insulation layer (not shown), the insulation layer can reduce the heat loss of the first heating jacket 8 and the second heating jacket 11, thereby achieving the effect of energy saving.

[0031] The working principle and usage process of this utility model are as follows: In use, the operator adds the solvent into the evaporator 1 through the feed pipe 5, then installs the sealing cover 6, and then starts the first heating jacket 8 to heat the solvent in the evaporator 1. The motor 4 rotates, driving the stirring rod 3 to rotate, thereby stirring the solvent in the evaporator 1. The operator starts the air pump 7 to transport the gas in the evaporator 1 to the external equipment, thereby reducing the gas pressure in the evaporator 1 and improving the evaporation efficiency of the solvent in the evaporator 1. At the same time, the operator can start the transfer pump 9 to transport the solvent in the evaporator 1 to the spiral tube 12. The operator starts the second heating jacket 11 to heat the heating medium in the heating tube 10. The heating medium heats the solvent in the spiral tube 12. The heated solvent is then transported back into the evaporator 1 to effectively heat the solvent in the evaporator 1, thereby improving the evaporation efficiency of the solvent in the evaporator 1.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid, comprising an evaporator (1), characterized in that: The top of the evaporator (1) is fixedly connected to a cover plate (2) by bolts. A stirring rod (3) is rotatably connected inside the cover plate (2). The stirring rod (3) is in contact with the evaporator (1). A first motor (4) is fixedly connected to the top of the cover plate (2). The output end of the first motor (4) is fixedly connected to the stirring rod (3). A feed pipe (5) is connected to the top of the cover plate (2). A sealing cover (6) is fixedly connected to the top of the feed pipe (5) by bolts. An air pump (7) is connected to the top of the cover plate (2). A first... A heating jacket (8) is provided. A delivery pump (9) is connected to the bottom of the evaporator (1). A heating tube (10) is fixedly connected to the surface of the evaporator (1) by a bracket. A second heating jacket (11) is fixedly connected to the surface of the heating tube (10). A spiral tube (12) is fixedly connected inside the heating tube (10). The outlet of the delivery pump (9) and the inlet of the spiral tube (12) are connected by a pipe. A circulation inlet pipe (13) is connected to the surface of the evaporator (1). The outlet of the spiral tube (12) and the circulation inlet pipe (13) are connected by a pipe.

2. The evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The surface of the stirring rod (3) is fixedly connected to a scraper frame (14), the scraper frame (14) is in contact with the inner wall of the evaporator (1), and there are several scraper frames (14), which are evenly distributed in a ring on the surface of the stirring rod (3).

3. The evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The surface of the stirring rod (3) is fixedly connected with conveying blades (15), and the number of conveying blades (15) is several.

4. An evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The surface of the first heating jacket (8) is fixedly connected to a movable column (16), and the surface of the movable column (16) is slidably connected to a support column (17). The internal thread of the support column (17) is connected to a screw (19). The surface of the movable column (16) is provided with a through-hole (18), and there are several through-holes (18). The screw (19) is inserted into the through-hole (18), and the surface of the screw (19) is sprayed with anti-rust paint.

5. An evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The surface of the evaporator (1) is fixedly connected with a lifting lug (20), and there are several lifting lugs (20), which are evenly distributed in a ring on the surface of the evaporator (1).

6. An evaporator for producing 2-acrylamido-2-methylpropanesulfonic acid according to claim 1, characterized in that: The surfaces of the first heating jacket (8) and the second heating jacket (11) are both fixedly connected with a heat insulation layer.

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