Rectification device for acrylic acid production

Abstract

The utility model discloses a rectification device for acrylic acid production, which comprises a rectification tank, the upper end of the rectification tank is provided with a distillation tank, the upper end of the distillation tank is provided with a tank cover, the tank cover is provided with a cleaning assembly, the cleaning assembly comprises a servo motor, the lower end of the servo motor is connected to the upper end of the tank cover through a screw, and the lower end of the servo motor is connected to the lower end of the tank cover through a screw. A rotating shaft is installed at the lower end of the servo motor, a connecting block is fixedly installed on the outer side of the rotating shaft, a lower layer cleaning plate and an upper layer cleaning plate are arranged at one end of the connecting block, and through the upper layer cleaning plate and the lower layer cleaning plate, impurities and sediments deposited on the surface of the tower plate due to liquid vapor contact can be effectively removed; along with continuous contact of steam and liquid in the distillation process, solid impurities, pollutants or condensates are prevented from being accumulated on the surface of the tower plate, it is ensured that the distillation tower continuously and efficiently conducts gas-liquid contact and distribution, and the separation effect is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of acrylic acid distillation devices, in particular to a distillation device for acrylic acid production. Background Art

[0002] In the production of acrylic acid, the distillation unit is one of the important separation and purification equipment. The distillation technology is mainly used for the separation and purification of raw materials, reaction intermediates and final products in the production process of acrylic acid to ensure the quality and production efficiency of the product. Acrylic acid is usually produced by the oxidation reaction of propylene. The main reaction pathway is through the catalytic oxidation of propylene in air or oxygen to generate acrolein, and then further oxidized to generate acrylic acid. The products generated in this reaction process usually contain acrylic acid and its by-products, so they need to be separated and purified by distillation.

[0003] However, in actual use, the raw liquid (usually containing acrylic acid and its by-products) is introduced into the bottom of the distillation tower. Common raw materials include mixtures containing acrylic acid, acrolein, water, etc. The raw liquid is heated to boiling through a heating system, usually a boiler or a heat exchanger, to generate steam. By controlling the heating temperature, different components are evaporated in the order of increasing boiling points. The heated steam enters the distillation tower and contacts with the lower liquid through tower plates or fillers. Light components such as acrylic acid evaporate upward, while heavy components such as acrolein or water are retained in the tower. Since the tower plates are used to separate acrylic acid for a long time, some sediments or by-products may accumulate after the tower plates have been running for a long time. These sediments may come from impurities in the raw materials, accumulated water, catalyst residues, etc. Utility Model Content

[0004] The purpose of the utility model is to provide a rectification device for acrylic acid production to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a distillation device for acrylic acid production, comprising a distillation tank, a distillation tank is arranged at the upper end of the distillation tank, a tank cover is arranged at the upper end of the distillation tank, a cleaning assembly is arranged on the tank cover, the cleaning assembly comprises a servo motor, the lower end of the servo motor is connected to the upper end of the tank cover by screws, a rotating shaft is installed at the lower end of the servo motor, a connecting block is fixedly installed on the outer side of the rotating shaft, and a lower cleaning plate and an upper cleaning plate are arranged at one end of the connecting block.

[0006] As a further preferred embodiment of the present technical solution, the lower end of the lower cleaning plate contacts the upper end of the tower plate, and the upper end of the upper cleaning plate contacts the lower end of the tower plate.

[0007] As a further preferred embodiment of the present technical solution, a fixing plate is provided at one end of the lower cleaning plate and the upper cleaning plate, a latch bolt is provided inside the fixing plate, and the latch bolt is connected to the inside of the lower cleaning plate and the upper cleaning plate by rotation.

[0008] As a further preferred embodiment of the present technical solution, one end of a mounting bracket is arranged on the outer side of the tower plate, and a bottom plate is arranged on the lower end of the mounting bracket.

[0009] As a further preferred embodiment of the present technical solution, the mounting bracket is connected to the inside of the guide rail groove by sliding, and the guide rail groove is opened on the inner wall of the distillation tank.

[0010] As a further preferred embodiment of the present technical solution, a support frame is installed at the lower end of the distillation tank, a discharge pipe is provided at the lower end of the distillation tank, and a feed port is installed at the upper end of the distillation tank.

[0011] The utility model provides a rectification device for acrylic acid production, which has the following beneficial effects:

[0012] (1) The utility model can effectively remove impurities and sediments deposited on the surface of the tower plate due to the contact between liquid and vapor through the upper cleaning plate and the lower cleaning plate. With the continuous contact between vapor and liquid during the distillation process, the accumulation of some solid impurities, pollutants or condensates on the surface of the tower plate is avoided, thereby ensuring that the distillation tower continues to efficiently carry out gas-liquid contact and distribution, thereby improving the separation effect.

[0013] (2) The utility model uses guide grooves and mounting brackets to enable the tower plates to maintain a stable working state during the distillation process, so that the tower plates can be freely moved or fixed in the vertical direction or other required directions within the distillation tower, making it easy for operators to disassemble and install them. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the structure of the distillation tank of the utility model;

[0016] Figure 3 This is a schematic diagram of the guide rail groove structure of the utility model;

[0017] Figure 4 This is a schematic diagram of the tower plate and mounting bracket structure of the utility model;

[0018] Figure 5 This is a schematic diagram of the disassembly structure of the cleaning component of the utility model;

[0019] Figure 6 This is a schematic diagram of the structure of the lower cleaning plate and the upper cleaning plate of the utility model;

[0020] In the figure: 100, distillation tank; 101, support frame; 102, discharge pipe; 103, feed port; 200, distillation tank; 201, tank cover; 202, guide rail groove; 203, mounting bracket; 204, tower plate; 205, bottom plate; 300, cleaning assembly; 301, servo motor; 302, rotating shaft; 303, lower cleaning plate; 305, upper cleaning plate; 306, connecting block; 307, latch bolt; 308, fixing plate. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0022] The utility model provides a technical solution: Figure 1-Figure 2 , Figure 4-Figure 6 As shown, in this embodiment, a distillation device for acrylic acid production includes a distillation tank 100, a distillation tank 200 is arranged at the upper end of the distillation tank 100, a tank cover 201 is arranged at the upper end of the distillation tank 200, and a cleaning assembly 300 is arranged on the tank cover 201. The cleaning assembly 300 includes a servo motor 301, and the lower end of the servo motor 301 is connected to the upper end of the tank cover 201 by screws. A rotating shaft 302 is installed at the lower end of the servo motor 301, and a connecting block 306 is fixedly installed on the outer side of the rotating shaft 302. One end of the connecting block 306 is provided with a lower cleaning plate 303 and an upper cleaning plate 305, and the lower end of the lower cleaning plate 303 The upper end of the upper cleaning plate 305 contacts the lower end of the tower plate 204. First, the heated vapor of acrylic acid enters the distillation tower and contacts the lower liquid through the tower plate 204 or the filler. Light components such as acrylic acid evaporate upward, while heavy components such as acrolein or water are left in the tower. When the distillation tower stops working, the servo motor 301 drives the rotating shaft 302 to rotate, and the rotating shaft 302 transmits the rotating power to the connecting block 306. The connecting block 306 drives the lower cleaning plate 303 to contact the upper end of the tower plate 204, while the upper cleaning plate 305 contacts the lower end of the tower plate 204. The rotation of the rotating shaft 302 causes the cleaning plate to scrape and clean the tower plate 204. Under the scraping of the upper and lower cleaning plates 303, the sediments and impurities on the surface of the tower plate 204 are cleaned off, so as to keep the tower plate 204 clean and have high separation efficiency.

[0023] The upper cleaning plate 305 and the lower cleaning plate 303 can effectively remove impurities and sediments deposited on the surface of the tower plate 204 due to the contact between liquid and vapor. With the continuous contact between steam and liquid during the distillation process, the accumulation of some solid impurities, pollutants or condensates on the surface of the tower plate 204 can be avoided, ensuring that the distillation tower continues to efficiently carry out gas-liquid contact and distribution, thereby improving the separation effect.

[0024] like Figure 6 As shown, a fixing plate 308 is provided at one end of the lower cleaning plate 303 and the upper cleaning plate 305, and a latch bolt 307 is provided inside the fixing plate 308. The latch bolt 307 is connected to the inside of the lower cleaning plate 303 and the upper cleaning plate 305 by rotation. The lower cleaning plate 303 and the upper cleaning plate 305 are connected and fixed by the fixing plate 308 and the latch bolt 307, and are easy to disassemble.

[0025] like Figure 3-Figure 5 As shown, one end of a mounting bracket 203 is disposed on the outer side of the tower plate 204, and a bottom plate 205 is disposed at the lower end of the mounting bracket 203. The mounting bracket 203 is connected to the inside of the guide rail groove 202 by sliding. The guide rail groove 202 is opened on the inner wall of the distillation tank 200. In actual use, first, a guide rail groove 202 is opened on the inner wall of the distillation tank 200 to provide a sliding path for the mounting bracket 203, and the mounting bracket 203 is slid inside the guide rail groove 202 to connect with the tower plate 204 to ensure that the tower plate 204 can be stably hung on the bracket. The lower end of the mounting bracket 203 is connected to the bottom plate 205. The bottom plate 205 supports the tower plate 204 so that it can move or be fixed freely in the vertical direction or other required directions in the distillation tower.

[0026] Through the guide groove 202 and the mounting bracket 203, the tower plate 204 can maintain a stable working state during the distillation process, so that the tower plate 204 can be freely moved or fixed in the vertical direction or other required directions in the distillation tower, which is convenient for operators to disassemble and install.

[0027] like Figure 1 As shown, a support frame 101 is installed at the lower end of the distillation tank 100, a discharge pipe 102 is provided at the lower end of the distillation tank 100, and a feed port 103 is installed at the upper end of the distillation tank 100, which is responsible for transporting the liquid mixture to be distilled to the distillation tower. The bottom of the distillation tank 100 usually heats the acrylic acid liquid mixture to evaporate the light components into steam. By controlling the heating intensity, the light components can be evaporated and sublimated. The discharge pipe 102 is provided at the lower end of the distillation tank 100, and is used to discharge the heavier components or substrates separated during the distillation process. These substrates are usually collected at the bottom of the distillation tower and removed through the discharge pipe 102.

[0028] The utility model provides a distillation device for acrylic acid production, and the specific working principle is as follows: a feed inlet 103 is installed at the upper end of a distillation tank 100, and is responsible for conveying a liquid mixture to be distilled into a distillation tower. The bottom of the distillation tank 100 usually heats the acrylic acid liquid mixture to evaporate the light components therein into steam. By controlling the heating intensity, the evaporation and sublimation of the light components can be achieved. A discharge pipe 102 is arranged at the lower end of the distillation tank 100, and is used to discharge heavier components or substrates separated during the distillation process. These bottoms are usually collected at the bottom of the distillation tower and removed through the discharge pipe 102. The heated vapor of acrylic acid enters the distillation tower and contacts the lower liquid through the tower plate 204 or the filler. Light components such as acrylic acid evaporate upward, while heavy components such as acrolein or water are left in the tower. When the distillation tower stops working, the rotating shaft 302 is driven to rotate by driving the servo motor 301, and the rotating shaft 302 is further driven to transmit the rotating power to the connecting block 306. The connecting block 306 drives the lower cleaning plate 303 to contact the upper end of the tower plate 204, and the upper cleaning plate 305 contacts the lower end of the tower plate 204. The rotation of the rotating shaft 302 causes the cleaning plate to scrape and clean the tower plate 204. Under the scraping of the upper and lower cleaning plates 303, the sediments and impurities on the surface of the tower plate 204 are cleaned off, so as to keep the tower plate 204 clean and have high separation efficiency.

[0029] 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. A distillation device for acrylic acid production, comprising a distillation tank (100), characterized in that: A distillation tank (200) is arranged at the upper end of the rectification tank (100), a tank cover (201) is arranged at the upper end of the distillation tank (200), a cleaning assembly (300) is arranged on the tank cover (201), and the cleaning assembly (300) comprises a servo motor (301), the lower end of the servo motor (301) is connected to the upper end of the tank cover (201) by screws, a rotating shaft (302) is installed at the lower end of the servo motor (301), a connecting block (306) is fixedly installed on the outer side of the rotating shaft (302), and a lower cleaning plate (303) and an upper cleaning plate (305) are arranged at one end of the connecting block (306).

2. The distillation device for acrylic acid production according to claim 1, characterized in that: The lower end of the lower cleaning plate (303) contacts the upper end of the tower plate (204), and the upper end of the upper cleaning plate (305) contacts the lower end of the tower plate (204).

3. A rectification device for acrylic acid production according to claim 2, characterized in that: A fixing plate (308) is provided at one end of the lower cleaning plate (303) and the upper cleaning plate (305), and a latch bolt (307) is provided inside the fixing plate (308). The latch bolt (307) is connected to the inside of the lower cleaning plate (303) and the upper cleaning plate (305) by rotation.

4. The distillation device for acrylic acid production according to claim 2, characterized in that: One end of a mounting bracket (203) is disposed on the outer side of the tower plate (204), and a bottom plate (205) is disposed at the lower end of the mounting bracket (203).

5. A rectification device for acrylic acid production according to claim 4, characterized in that: The mounting bracket (203) is connected to the inside of the guide rail groove (202) by sliding, and the guide rail groove (202) is opened on the inner wall of the distillation tank (200).

6. The distillation device for acrylic acid production according to claim 1, characterized in that: A support frame (101) is installed at the lower end of the distillation tank (100), a discharge pipe (102) is provided at the lower end of the distillation tank (100), and a feed port (103) is installed at the upper end of the distillation tank (100).

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