Absorption tower for hydroxyethyl methylacrylate production

Abstract

The utility model discloses an absorption tower for hydroxyethyl methylacrylate production, which comprises an absorption tower, the outer end of the absorption tower is fixedly connected with a bracket, a gas inlet pipe is arranged on one side of the absorption tower in a penetrating manner, a liquid discharge pipe I is arranged at the bottom of the absorption tower in a penetrating manner, and a filter box is arranged at the lower end of the liquid discharge pipe I in a penetrating manner; mounting plates are fixedly connected to the two ends of the inner side of the filter box, a first filter plate and a second filter plate are correspondingly mounted in the mounting plates, and the filter box is mounted below the liquid discharge pipe of the tower body, so that reacted liquid can be quickly filtered, and impurities in the liquid are prevented from influencing subsequent production and processing; meanwhile, the two groups of filter plates in the filter box are disassembled and assembled by adopting springs and positioning assemblies, so that workers can conveniently take out the filter plates to clean and replace the filter plates after the filter plates are used for a period of time, and the tidying and filtering effects are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydroxyethyl methacrylate production technical field, especially in hydroxyethyl methacrylate production is used absorption tower. BACKGROUND

[0002] Hydroxyethyl methacrylate is prepared by adding iron thiocyanate, tetramethylammonium chloride and a little amount of hydroquinone into methacrylic acid, stirring and heating to 90 DEG C, and then introducing ethylene oxide gas under nitrogen protection for about 2 hours. The reaction product is cooled to 60 DEG C, and then distilled under reduced pressure after adding a little amount of hydroquinone. The fraction collected at 86-89 DEG C (0.67 kPa) is the finished product, and the yield is more than 80%.

[0003] During the production of hydroxyethyl methacrylate, an absorption tower is needed.

[0003] HEMA may partially polymerize in the absorption tower due to temperature fluctuation or residual initiator (such as peroxide), generating polyhydroxyethyl methacrylate (PHEMA) colloidal particles. Therefore, a filter assembly is needed. However, if no filter is used, the downstream catalyst may be poisoned (such as the degradation product of the polymerization inhibitor MEHQ adsorbed on the surface of the catalyst), and the purity of the product may decrease (PHEMA mixed into the finished product may reduce the content of HEMA monomer from 99.5% to below 98%, affecting the efficiency of the subsequent polymerization reaction). However, the existing filter structure is usually welded or bolted in the tower, and disassembly requires shutdown and emptying of the tower body, which has high maintenance cost. After searching, it is found that the technical solution provided in the utility model with the application number "202220652392.X Absorption tower for hydroxyethyl methacrylate production" also has the problem that the filter screen cannot be disassembled. In addition, the existing absorption tower sprays the mixed solution using a spray head, and then sprays and reacts with ethylene oxide gas. However, since the spray head is fixed, the mixed solution sprayed by the spray head cannot be fully contacted with the gas, which further leads to insufficient reaction. UTILITY MODEL CONTENTS

[0004] The utility model aims at providing an absorption tower for hydroxyethyl methacrylate production, which solves the problems of the existing absorption tower that the internal filter structure cannot be disassembled and the mixed solution sprayed by the spray head cannot be fully contacted with the gas.

[0005] To achieve the above-mentioned purpose, an absorption tower for hydroxyethyl methacrylate production is provided, which comprises an absorption tower, a support fixedly connected to the outer end of the absorption tower, an air inlet pipe penetrating through one side of the absorption tower, a liquid discharge pipe one penetrating through the bottom of the absorption tower, a filter box penetrating through the lower end of the liquid discharge pipe one, mounting plates fixedly connected to the inner sides of the filter box, and filter plates one and two correspondingly installed in the mounting plates.

[0006] The inner side of the filter box is provided with a sliding groove at both ends, a sliding rod is fixedly connected in the sliding groove, a sliding block is slidably connected to the sliding rod, a positioning block is fixedly connected to one end of the sliding block, and positioning grooves are formed in the mounting plate, the first filter plate and the second filter plate.

[0007] According to the absorption tower for producing hydroxyethyl methacrylate, a spring is sleeved on the sliding rod, one end of the spring is fixedly connected in the sliding groove, and the other end is fixedly connected to the sliding block.

[0008] According to the absorption tower for producing hydroxyethyl methacrylate, a liquid discharge pipe two is arranged at one end of the outer side of the filter box, and a water pump one is arranged in the middle of the liquid discharge pipe two.

[0009] According to the absorption tower for producing hydroxyethyl methacrylate, a gas outlet pipe is arranged at the top of the absorption tower, and an electromagnetic valve is arranged in the liquid discharge pipe one and the gas outlet pipe.

[0010] According to the absorption tower for producing hydroxyethyl methacrylate, a liquid storage tank is arranged on one side of the absorption tower, and a liquid inlet pipe is arranged through the upper portion of the liquid storage tank.

[0011] According to the absorption tower for producing hydroxyethyl methacrylate, a water pump two is arranged in the middle of the liquid inlet pipe, a fixing frame is fixedly connected to the upper end of the inner side of the absorption tower, a spraying disc is rotatably connected in the fixing frame, the other end of the water pump two is rotatably connected in the spraying disc, and a plurality of spraying heads are arranged through the lower portion of the spraying disc.

[0012] According to the absorption tower for producing hydroxyethyl methacrylate, a worm gear is fixedly connected to the outer end of the spraying disc, and a worm is rotatably connected to the upper end of the fixing frame.

[0013] According to the absorption tower for producing hydroxyethyl methacrylate, a motor is fixedly connected to the fixing frame, the output end of the motor is fixedly connected to the worm, and the worm and the worm gear are meshed with each other.

[0014] The above-mentioned scheme has the following beneficial effects:

[0015] 1. The filter box installed below the liquid discharge pipe of the tower body can quickly filter the liquid after reaction, prevent impurities in the liquid from affecting subsequent production and processing, and the two groups of filter plates in the filter box are disassembled by the spring and the positioning assembly, which is convenient for workers to take out and clean and replace after a period of use, and improves the filtering effect of the whole.

[0016] 2、The patent can ensure that the mixed solution is sprayed more uniformly by setting the rotatable spraying assembly, and the mixed liquid can react more fully with the ethylene oxide gas.

[0017] The additional aspects and advantages of the present application will be given in part in the following description, and will become apparent from the following description, or will be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present application will be further described below in conjunction with the drawings and embodiments.

[0019] Figure 1 It is a front view of the absorption tower for producing hydroxyethyl methacrylate of the present application;

[0020] Figure 2 It is a spraying assembly schematic view of the absorption tower for producing hydroxyethyl methacrylate of the present application;

[0021] Figure 3 It is a filter box internal schematic view of the absorption tower for producing hydroxyethyl methacrylate of the present application;

[0022] Figure 4 It is a structure schematic view of the present application Figure 3 A.

[0023] LEGEND:

[0024] 1, absorption tower; 2, air inlet pipe; 3, support; 4, liquid discharge pipe one; 5, filter box; 6, liquid discharge pipe two; 7, water pump one; 8, liquid storage tank; 9, water pump two; 10, liquid inlet pipe; 11, gas outlet pipe; 12, spraying disc; 13, worm gear; 14, fixing frame; 15, spraying head; 16, filter plate one; 17, filter plate two; 18, positioning groove; 19, mounting plate; 20, positioning block; 21, sliding block; 22, spring; 23, sliding rod; 24, sliding groove; 25, worm; 26, motor; 27, electromagnetic valve. DETAILED DESCRIPTION

[0025] This part will describe the specific embodiments of the present application in detail, and the preferred embodiments of the present application are shown in the drawings, and the drawings are used to supplement the description of the text part, so that people can intuitively and visually understand each technical feature and the overall technical scheme of the present application, but it cannot be understood as a limitation on the protection scope of the present application.

[0026] REFERENCE Figures 1-4The utility model discloses an embodiment hydroxyethyl methacrylate production is with absorption tower, including absorption tower 1, the outer end fixed connection of absorption tower 1 has support 3, can be stabilized to the device through support 3 and support, the side of absorption tower 1 is penetrated and is provided with inlet pipe 2, can be with ethylene oxide gas into the inside of absorption tower 1 through inlet pipe 2, the bottom of absorption tower 1 is penetrated and is provided with liquid discharge pipe one 4, the lower end of liquid discharge pipe one 4 is penetrated and is provided with filter box 5, the inboard both ends of filter box 5 are fixedly connected with mounting plate 19, the inside corresponding installation of mounting plate 19 has filter plate one 16 and filter plate two 17, can be after the liquid of reaction into filter box 5 through liquid discharge pipe one 4, can filter the impurity in liquid through the filter plate one 16 and filter plate two 17 in the inside, avoid influencing subsequent processing operation;

[0027] The inboard both ends of filter box 5 are provided with sliding slot 24, sliding slot 24 is fixedly connected with sliding rod 23 in the inside, sliding rod 23 is slidably connected with sliding block 21, one end of sliding block 21 is fixedly connected with positioning block 20, mounting plate 19, filter plate one 16 and filter plate two 17 are all provided with positioning groove 18, positioning block 20 corresponds with positioning groove 18, spring 22 is sleeved on sliding rod 23, one end of spring 22 is fixedly connected in the inside of sliding slot 24, and the other end is fixedly connected on sliding block 21, when needing to disassemble and clean filter plate one 16 and filter plate two 17, pull sliding block 21 upwards, under the action of spring 22, sliding block 21 can drive positioning block 20 to move upwards, positioning block 20 is separated from the inside of positioning groove 18 at this time, and the filter plate one 16 and filter plate two 17 can be taken out and replaced by directly pulling out to the outside by staff, improve the filtering effect of whole, secondly, the outside of filter box 5 is provided with box door, can complete replacement work;

[0028] The outside one end of filter box 5 is penetrated and is provided with liquid discharge pipe two 6, and water pump one 7 is arranged in the middle of liquid discharge pipe two 6, and gas outlet pipe 11 is penetrated and is arranged at the top of absorption tower 1, and electromagnetic valve 27 is installed in the inside of liquid discharge pipe one 4 and gas outlet pipe 11, and the side of absorption tower 1 is provided with liquid storage tank 8, and liquid inlet pipe 10 is penetrated and is arranged at the top of liquid storage tank 8, and liquid storage tank 8 can store reaction liquid, and the opening and closing of gas outlet pipe 11 and liquid discharge pipe one 4 can be controlled through electromagnetic valve 27;

[0029] The middle part of the liquid inlet pipe 10 is provided with a water pump two 9, the inner side upper end of the absorption tower 1 is fixedly connected with a fixed frame 14, the inside of the fixed frame 14 is rotatably connected with a spraying disc 12, and the other end of the water pump two 9 is rotatably connected in the inside of the spraying disc 12, a plurality of spraying heads 15 are arranged in the lower part of the spraying disc 12, the outer end of the spraying disc 12 is fixedly connected with a worm wheel 13, the upper end of the fixed frame 14 is rotatably connected with a worm 25, the fixed frame 14 is fixedly connected with a motor 26, the output end of the motor 26 is fixedly connected with the worm 25, and the worm 25 and the worm wheel 13 are meshed with each other, the water pump two 9 is started to make the reaction liquid sprayed downward through the liquid inlet pipe 10 and the spraying head 15, and the ethylene oxide also enters the absorption tower 1 under the action of the gas inlet pipe 2, at this time, the motor 26 is started to drive the worm 25 to rotate, and under the meshing action, the worm wheel 13 can be driven to rotate, so that the spraying disc 12 rotates, the reaction liquid is sprayed more uniformly, the reaction of the reaction liquid and the ethylene oxide gas is more sufficient, in order to ensure the stable operation of the internal components, the worm 25 and the worm wheel 13 are preferably made of 316L stainless steel or duplex stainless steel (such as 2205), which is resistant to organic acid and wet corrosion, the surface is plated with hard chromium (thickness ≥ 50 μm) to enhance wear resistance, prevent corrosion and reduce friction, at the same time, the motor 26 is selected from IP66 / IP67 explosion-proof motor (such as ATEX certified), the shell is made of stainless steel 316L, the shaft end is provided with mechanical seal + double lip seal to prevent HEMA vapor from entering, and a porous reaction plate is arranged at the inner side upper end of the absorption tower 1, the porous reaction plate is arranged above the spraying assembly, so that the ethylene oxide and the reaction liquid react and absorb on the porous reaction plate, and then the reacted liquid drops on the lower part of the tower body through the porous reaction plate.

[0030] Working principle: in use, first, the methacrylic acid is made into a reaction liquid by a hydroxyl ester reactor under the action of a catalyst, and then the reaction liquid is sprayed downward through the liquid inlet pipe 10 and the spraying head 15, and the ethylene oxide also enters the absorption tower 1 under the action of the gas inlet pipe 2, at this time, the motor 26 is started to drive the worm 25 to rotate, and under the meshing action, the worm wheel 13 can be driven to rotate, so that the spraying disc 12 rotates, the reaction liquid is sprayed more uniformly, the reaction of the reaction liquid and the ethylene oxide gas is more sufficient;

[0031] Then the reacted liquid will drop downward and gradually gather at the bottom of the absorption tower 1, the electromagnetic valve 27 is opened to make the liquid enter the inside of the filter box 5, the impurities in the liquid can be filtered through the filter plate one 16 and the filter plate two 17 in the filter box 5, finally, the water pump one 7 is started to make the filtered liquid discharged outward through the liquid outlet pipe two 6, and the gas in the inside can be discharged outward through the gas outlet pipe 11, and a series of work is completed.

[0032] The utility model embodiment makes the detailed explanation in combination with the drawing, but the utility model is not limited to the above -mentioned embodiment, still can make various changes in the knowledge range that the person skilled in the art has possesses without departing from the utility model's tenet under the precondition that the knowledge range that the person skilled in the art has possesses.

Claims

1. An absorption column for hydroxyethyl methacrylate production, comprising an absorption column (1), characterized in that, The outer end of the absorption tower (1) is fixedly connected with a support (3), one side of the absorption tower (1) is provided with a gas inlet pipe (2), the bottom of the absorption tower (1) is provided with a liquid outlet pipe (4), the lower end of the liquid outlet pipe (4) is provided with a filter box (5), the inner side of the filter box (5) is fixedly connected with a mounting plate (19), the inside of the mounting plate (19) is correspondingly provided with a filter plate (16) and a filter plate (17). The inner side of the filter box (5) is provided with a sliding groove (24), the sliding groove (24) is fixedly connected with a sliding rod (23), the sliding rod (23) is slidably connected with a sliding block (21), one end of the sliding block (21) is fixedly connected with a positioning block (20), the mounting plate (19), the filter plate (16) and the filter plate (17) are all provided with a positioning groove (18), and the positioning block (20) corresponds to the positioning groove (18).

2. The absorption tower for producing hydroxyethyl methacrylate according to claim 1, characterized in that, The sliding rod (23) is provided with a spring (22), one end of the spring (22) is fixedly connected in the sliding groove (24), and the other end is fixedly connected on the sliding block (21).

3. The absorption tower for producing hydroxyethyl methacrylate according to claim 1, characterized in that, One end of the filter box (5) is provided with a liquid outlet pipe (6), and the middle of the liquid outlet pipe (6) is provided with a water pump (7).

4. The absorption tower for producing hydroxyethyl methacrylate according to claim 1, characterized in that, The top of the absorption tower (1) is provided with a gas outlet pipe (11), and the inside of the liquid outlet pipe (4) and the gas outlet pipe (11) is provided with an electromagnetic valve (27).

5. The absorption tower for producing hydroxyethyl methacrylate according to claim 1, characterized in that, One side of the absorption tower (1) is provided with a liquid storage tank (8), and the upper part of the liquid storage tank (8) is provided with a liquid inlet pipe (10).

6. The absorption column for producing hydroxyethyl methacrylate according to claim 5, characterized by The middle of the liquid inlet pipe (10) is provided with a water pump (9), the inner side of the absorption tower (1) is fixedly connected with a fixed frame (14), the inside of the fixed frame (14) is rotatably connected with a spraying disc (12), and the other end of the water pump (9) is rotatably connected in the inside of the spraying disc (12), and the lower part of the spraying disc (12) is provided with a plurality of spraying heads (15).

7. The absorption column for producing hydroxyethyl methacrylate according to claim 6, characterized by The outer end of the spraying disc (12) is fixedly connected with a worm wheel (13), and one end of the upper part of the fixed frame (14) is rotatably connected with a worm (25).

8. The absorption column for producing hydroxyethyl methacrylate according to claim 7, characterized by The fixed frame (14) is fixedly connected with a motor (26), the output end of the motor (26) is fixedly connected with the worm (25), and the worm (25) and the worm wheel (13) are meshed with each other.

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