A two-column separation column for methyl methacrylate production

Abstract

This utility model relates to the field of methyl methacrylate preparation apparatus, specifically to a dual-tower separation tower for methyl methacrylate preparation, comprising a support frame, with a first tower and a second tower respectively mounted on a pair of supports. Both the first and second towers are equipped with electrically heated rings. A conveying pipe is provided between the first and second towers. Pressure control mechanisms are provided at the rear of both the first and second towers. A stirring mechanism is installed at the bottom of the first tower, with a motor driving an anchor-type stirring rod to rotate, ensuring uniform mixing of the raw materials, avoiding localized aggregation, improving raw material utilization and product quality. This solves the problem of uneven mixing and incomplete reaction caused by the lack of stirring in traditional towers. With the help of temperature and pressure monitors and a vacuum machine and compressor in the pressure control mechanism, the temperature and pressure of the two towers are precisely controlled according to reaction requirements.

Description

Technical Field

[0001] This utility model relates to the field of methyl methacrylate preparation apparatus, and more particularly to a dual-tower separation tower for methyl methacrylate preparation. Background Technology

[0002] In chemical production, methyl methacrylate is an important raw material and monomer for manufacturing products such as plexiglass, coatings, and adhesives. The separation steps during its preparation greatly affect the product quality and purity, and are crucial for subsequent processing and applications.

[0003] Traditional methyl methacrylate (MMA) preparation separation towers are mostly single-tower structures, which have significant drawbacks. Firstly, they lack stirring devices, resulting in uneven mixing of raw materials after entering the tower, incomplete reaction, local aggregation of different components, inconsistent reaction rates, low raw material utilization, and impacted product purity. For example, low-boiling-point impurities are easily trapped in the unevenly mixed raw materials, making separation difficult during distillation. Secondly, temperature and pressure control is inadequate. Without advanced temperature and pressure monitoring devices and pressure control mechanisms, it is difficult to precisely regulate the temperature and pressure within the tower to meet the reaction and separation requirements. During distillation, excessively high temperatures cause MMA decomposition and reduced yield, while excessively low temperatures prevent the complete evaporation of low-boiling-point impurities. Improper pressure control can obstruct material transport or even cause backflow, interfering with the continuity and stability of production. Thirdly, separation efficiency is low. Single-tower separation capacity is limited, making multi-stage, fine separation difficult. Separation of components with different boiling points is poor, resulting in a high level of product impurities, requiring multiple purification processes, which unnecessarily increases costs and time. Utility Model Content

[0004] The purpose of this invention is to provide a dual-tower separation tower for the preparation of methyl methacrylate, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a dual-tower separation tower for the preparation of methyl methacrylate, comprising a support frame, a first tower and a second tower respectively mounted on a pair of the support frames, both the first tower and the second tower being equipped with an electric heating ring, a conveying pipe being provided between the first tower and the second tower, a one-way valve being provided on the side of the conveying pipe near the first tower, a pressure control mechanism being provided at the rear of both the first tower and the second tower, a stirring mechanism being provided at the bottom of the first tower, and a demisting packing being provided in the upper part of the second tower.

[0006] As a preferred embodiment of the present invention, the first tower is provided with a feed inlet on one side and a distillation separation pipe is provided at the top of the first tower.

[0007] In a preferred embodiment of this invention, the stirring mechanism includes a motor, the output end of which is connected to a rotating cylinder that extends into the first tower. The other end of the rotating cylinder is connected to an anchor-type stirring rod. A sealing ring is provided between the rotating cylinder and the first tower. The motor is located inside a support platform, which is located at the bottom of the first tower.

[0008] As a preferred embodiment of this invention, the lower part of the second tower is provided with distillation packing, the bottom of the second tower is connected to a waste liquid pipe, and the top of the second tower is connected to a discharge pipe.

[0009] As a preferred embodiment of this invention, one end of the conveying pipe is connected to the bottom of the first tower, and the other end of the conveying pipe is connected to the middle of the bottom of the second tower. A pressure indicator is provided in the middle of the conveying pipe.

[0010] In a preferred embodiment of this invention, the pressure control mechanism includes a vacuum machine and a compressor. The vacuum machine has an input pipe at its input end, which extends into the first and second towers respectively and is equipped with a filter screen. The compressor has an output pipe at its output end, which extends into the first and second towers respectively and is equipped with a filter screen. The compressor's input end is connected to a gas delivery pipe. Temperature and pressure monitors are provided at the front of the first and second towers.

[0011] Compared with the prior art, the above-mentioned technical solution of this utility model has the following beneficial technical effects:

[0012] A stirring mechanism is installed at the bottom of the first tower. The motor drives the anchor stirring rod to rotate, so that the raw materials are mixed evenly, avoiding local aggregation, improving the utilization rate of raw materials and product quality, and solving the problems of uneven mixing and insufficient reaction caused by the lack of stirring in traditional towers.

[0013] By utilizing temperature and pressure monitors and the vacuum pump and compressor in the pressure control mechanism, the temperature and pressure of the two towers are precisely controlled according to the reaction requirements. This prevents separation from being affected by abnormal temperatures, ensures smooth material transport, overcomes the problem of inaccurate temperature and pressure control in traditional towers, and guarantees continuous and stable production.

[0014] Employing a dual-tower design, the first tower performs preliminary distillation, while the second tower further refines the distillation process, utilizing both distillation packing and demister packing. This efficiently separates components with different boiling points, removes evaporated gas droplets, improves separation efficiency, reduces impurities, lowers costs and cycle time, and solves the problems of weak separation capacity and incomplete gas handling inherent in traditional single-tower systems.

[0015] A one-way valve is installed in the conveying pipe to prevent backflow, and a pressure indicator monitors the pressure in real time. This ensures stable unidirectional material flow, solving the problems of easy backflow and inability to monitor pressure in traditional tower conveying systems, and guaranteeing safe and stable conveying. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall design of this utility model;

[0017] Figure 2 This is a front view of the entire utility model;

[0018] Figure 3This is a rear view of the entire utility model;

[0019] Figure 4 This is a half-sectional view of the first tower of this utility model;

[0020] Figure 5 This is a half-sectional view of the second tower of this utility model.

[0021] Reference numerals: 1. Support frame; 2. First tower; 3. Second tower; 4. Electric heating ring; 5. Conveying pipe; 6. Pressure control mechanism; 201. Feed inlet; 202. Distillation separation pipe; 204. Motor; 205. Rotary drum; 206. Anchor stirring rod; 207. Sealing ring; 208. Support platform; 301. Distillation packing; 302. Demisting packing; 303. Waste liquid pipe; 304. Discharge pipe; 501. Check valve; 502. Pressure indicator; 601. Vacuum machine; 602. Compressor; 603. Input pipe; 604. Filter screen; 605. Output pipe; 7. Temperature and pressure monitor. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of this utility model. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of this utility model.

[0023] This utility model provides a technical solution: a dual-tower separation tower for the preparation of methyl methacrylate, such as... Figure 1 As shown, it includes a support 1, a first tower 2 and a second tower 3 respectively on a pair of supports 1, an electric heating ring 4 is provided in both the first tower 2 and the second tower 3, a conveying pipe 5 is provided between the first tower 2 and the second tower 3, a one-way valve 501 is provided on the side of the conveying pipe 5 near the first tower 2, a pressure control mechanism 6 is provided at the rear of both the first tower 2 and the second tower 3, a stirring mechanism is provided at the bottom of the first tower 2, and a demisting packing 302 is provided in the upper part of the second tower 3.

[0024] like Figure 2 As shown, a feed inlet 201 is provided on one side of the first tower 2, and a distillation separation pipe 202 is provided on the top of the first tower 2.

[0025] like Figure 4 , Figure 5 As shown, the stirring mechanism includes a motor 204, the output end of which is connected to a rotating cylinder 205, which extends into the first tower 2, and the other end of the rotating cylinder 205 is connected to an anchor stirring rod 206. A sealing ring 207 is provided between the rotating cylinder 205 and the first tower 2. The motor 204 is located inside a support platform 208, which is located at the bottom of the first tower 2.

[0026] like Figure 2 , Figure 3 , Figure 5 As shown, the second tower 3 is equipped with distillation packing 301 at the bottom, and the bottom of the second tower 3 is connected to a waste liquid pipe 303. The waste liquid pipe 303 is equipped with a valve that can control the on / off state, and the top of the second tower 3 is connected to a discharge pipe 304.

[0027] like Figure 1 , Figure 2 As shown, one end of the conveying pipe 5 is connected to the bottom of the first tower 2, and the other end of the conveying pipe 5 is connected to the middle of the bottom of the second tower 3. A pressure indicator 502 is provided in the middle of the conveying pipe 5.

[0028] like Figure 1 , Figure 3 As shown, the pressure control mechanism 6 includes a vacuum machine 601 and a compressor 602. The input end of the vacuum machine 601 is provided with an input pipe 603, which extends into the interior of the first tower 2 and the second tower 3 respectively, and is provided with a filter screen 604. The output end of the compressor 602 is provided with an output pipe 605, which extends into the interior of the first tower 2 and the second tower 3 respectively, and is provided with a filter screen 604. The input end of the compressor 602 is connected to a gas supply pipe 606, and the other end of the gas supply pipe 606 is connected to an external inert gas source. Temperature and pressure monitors 7 are provided at the front of the first tower 2 and the second tower 3.

[0029] In practice, the raw materials for preparing methyl methacrylate are prepared and connected to an external input pipe through the feed inlet 201 on one side of the first column 2. Multiple raw materials are then added into the column. After the raw materials are added, the input process is immediately stopped, and the external input pipe is sealed to prevent external impurities from entering the column and interfering with subsequent reaction processes.

[0030] The motor 204 at the bottom of the first tower 2 is turned on, driving the anchor-type stirring rod 206 to stir the raw materials, ensuring uniform mixing. Then, the electric heating ring 4 is turned on to heat and evaporate the raw materials. The temperature inside the first tower 2 is generally controlled at approximately 80-90℃, which is below the boiling point of methyl methacrylate, allowing low-boiling-point impurities to evaporate preferentially. Temperature and pressure changes are closely monitored using the temperature and pressure monitor 7 on one side of the first tower 2. If the pressure is insufficient (ideally maintained at 0.15-0.2 MPa) or too high, the pressure is adjusted using the pressure control mechanism 6. The top distillation separation pipe 202 is connected to an external primary gas separation treatment device. After evaporation, the separated gas is initially separated and discharged through the distillation separation pipe 202 at the top of the first tower 2 for further processing. During this process, the pressure in the first tower 2 will change.

[0031] After the pressure stabilizes, the initial separation is complete. To ensure the material after initial separation flows smoothly through the conveying pipe 5 to the second tower 3, external inert gas is introduced into the first tower 2 via the compressor 602 and the gas supply pipe 606, raising the pressure in the first tower 2 to 0.25-0.3 MPa. The pressure in the second tower 3 is maintained at 0.05-0.1 MPa by the vacuum pump 601. This creates a pressure difference of 0.15-0.2 MPa across the conveying pipe 5, propelling the material flow. A one-way valve 501 prevents backflow, and a pressure indicator 502 on the conveying pipe 5 ensures stable material delivery.

[0032] After the material enters the second column 3, the electric heating ring 4 of the second column 3 is activated for further distillation. At this time, the temperature inside the second column 3 is raised to approximately 100-110℃, higher than the temperature of the first column, to evaporate the methyl methacrylate product. The material achieves finer separation at the distillation packing 301 at the bottom of the second column 3. During heating, the evaporated gas moves upwards towards the top of the column. The gas at the top of the column passes through the demister packing 302 in the upper part of the second column 3 to remove floating droplets. The temperature and pressure monitor 7 is monitored, and the pressure in the second column 3 is adjusted via the pressure control mechanism 6. High-boiling-point impurities flow to the bottom of the column, and the valve of the waste liquid pipe 303 is opened, allowing the impurities to be discharged from the bottom waste liquid pipe 303. The finished methyl methacrylate product is output from the top discharge pipe 304 and collected by a condenser.

[0033] It should be understood that the above-described specific embodiments of this utility model are merely illustrative or explanatory of the principles of this utility model and do not constitute a limitation thereof. Therefore, any modifications, equivalent substitutions, improvements, etc., made without departing from the spirit and scope of this utility model should be included within the protection scope of this utility model. Furthermore, the appended claims are intended to cover all variations and modifications falling within the scope and boundaries of the appended claims, or equivalent forms of such scope and boundaries.

Claims

1. A two-column separation column for the production of methyl methacrylate, characterized by: Includes a support (1), on which a first tower (2) and a second tower (3) are respectively provided. Both the first tower (2) and the second tower (3) are provided with electric heating rings (4). A conveying pipe (5) is provided between the first tower (2) and the second tower (3). A one-way valve (501) is provided on the side of the conveying pipe (5) near the first tower (2). A pressure control mechanism (6) is provided at the rear of both the first tower (2) and the second tower (3). A stirring mechanism is provided at the bottom of the first tower (2). A demisting packing (302) is provided in the upper part of the second tower (3).

2. A methyl methacrylate production two-column separation tower according to claim 1, characterized in that: The first tower (2) has a feed inlet (201) on one side and a distillation separation tube (202) on the top of the first tower (2).

3. A methyl methacrylate production two-column separation tower according to claim 2, characterized in that: The stirring mechanism includes a motor (204), the output end of which is connected to a rotating cylinder (205), the rotating cylinder (205) extending into the first tower (2), the other end of which is connected to an anchor stirring rod (206), a sealing ring (207) between the rotating cylinder (205) and the first tower (2), the motor (204) being located inside a support platform (208), and the support platform (208) being located at the bottom of the first tower (2).

4. A methyl methacrylate production two-column separation tower according to claim 3, characterized in that: The second tower (3) is equipped with distillation packing (301) at the bottom, the bottom of the second tower (3) is connected to a waste liquid pipe (303), and the top of the second tower (3) is connected to a discharge pipe (304).

5. A methyl methacrylate production two-column separation tower according to claim 4, characterized in that: One end of the conveying pipe (5) is connected to the bottom of the first tower (2), and the other end of the conveying pipe (5) is connected to the middle of the bottom of the second tower (3). A pressure indicator (502) is provided in the middle of the conveying pipe (5).

6. A methyl methacrylate production two-column separation tower according to claim 5, characterized in that: The pressure control mechanism (6) includes a vacuum machine (601) and a compressor (602). The vacuum machine (601) has an input pipe (603) at its input end. The input pipe (603) extends into the first tower (2) and the second tower (3) respectively and is equipped with a filter screen (604). The compressor (602) has an output pipe (605) at its output end. The output pipe (605) extends into the first tower (2) and the second tower (3) respectively and is equipped with a filter screen (604). The compressor (602) has a gas delivery pipe (606) connected to its input end. Temperature and pressure monitors (7) are provided at the front of the first tower (2) and the second tower (3).

Images