An apparatus for preparing an aqueous formaldehyde solution

Abstract

The application discloses a method for preparing a formaldehyde aqueous solution and relates to the technical field of formaldehyde preparation. The method comprises a reaction tower, the upper surface of the reaction tower is provided with an airflow box which is communicated with the reaction tower and is provided with an input end, an axle rod is rotatably arranged in the airflow box, a plurality of uniformly distributed fan blades are arranged on the side surface of the axle rod, a mounting plate is arranged on the side surface of the reaction tower, a disc is rotatably arranged on the side surface of the mounting plate, a transmission assembly is arranged between the airflow box and the disc, methanol mixed gas enters the airflow box, the axle rod is driven to rotate by the fan blades, then the disc is driven to rotate by the transmission assembly, the polishing plate is driven to move left and right by the two connecting rods, silver sulfide powder on the surface of silver particles is polished off, the powder is prevented from adhering to the surface of the silver particles and affecting the catalytic speed, and in the process that the sealing plate moves, the polishing plate is driven to move out of the area directly above the placement disc by the assembly, and the polishing plate is prevented from hindering the contact between the mixed gas and the silver particle catalyst.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of preparing formaldehyde, in particular to a device for preparing formaldehyde aqueous solution. BACKGROUND

[0002] Formaldehyde is colorless aqueous solution or gas, has pungent smell, can be mixed with water, ethanol, acetone and other organic solvents in any proportion. Liquid is easy to turbidity when stored for a long time in cold, and forms trioxymethylene precipitate at low temperature. When evaporated, a part of formaldehyde escapes, but most of them become trioxymethylene. The product is a strong reducing agent, and the reducing property is stronger in trace alkaline;

[0003] The preparation process of formaldehyde is that the methanol is conveyed into the methanol vaporizer by the methanol pump for vaporization, and air is sent into the methanol vaporizer by the fan for mixing. After mixing, the volume of the mixed gas is 4-8% of the volume of the air. After mixing, the mixed gas is conveyed into the preheater, the preheating temperature is 170 DEG C, and after being fully preheated, the mixed gas is conveyed into the reactor. The temperature in the reactor is 220 DEG C, the catalyst is silver catalyst, the reaction time is 6-9 min, and the formaldehyde gas from the reactor is preheated by the raw material of the methanol vaporizer, and the temperature is reduced by 110-130 DEG C. The formaldehyde gas is conveyed into the absorption tower, and is exchanged with the process water flowing in the opposite direction, and is diluted. When the concentration reaches 40-60%, the formaldehyde solution is extracted from the bottom of the absorption tower, 10% is circulated back to the absorption tower as the absorption liquid, and the other part is conveyed to the formaldehyde storage tank as the product by the formaldehyde pump.

[0004] The silver catalyst is silver particles, and the mixed gas of methanol and air contains sulfur dioxide. Since the silver particles are easy to react with sulfur dioxide to generate black silver sulfide powder, the powder is attached to the surface of the silver particles, thereby reducing the contact area of the silver particles and the air. After a long time, the excessive silver sulfide powder will affect the catalytic speed of the silver particles, thereby reducing the speed of converting methanol into formaldehyde, prolonging the production time, and reducing the production efficiency. Therefore, the person skilled in the art proposes a device for preparing formaldehyde aqueous solution. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application provides a device for preparing formaldehyde aqueous solution, which solves the problems in the above background.

[0006] In order to achieve the above object, the present application is realized by the following technical scheme: a device for preparing formaldehyde aqueous solution, comprising a reaction tower, a gas flow box is installed on the upper surface of the reaction tower and communicates with the reaction tower, a shaft rod is rotatably installed in the gas flow box, a plurality of fan blades are uniformly distributed on the side surface of the shaft rod, an installation plate is installed on the side surface of the reaction tower, a disc is rotatably installed on the side surface of the installation plate, a transmission assembly is arranged between the gas flow box and the disc, a first connecting rod is rotatably installed on the side edge of the disc, a second connecting rod extending into the reaction tower is rotatably installed on the other end of the first connecting rod, a first horizontal plate is installed on the end of the second connecting rod, a placing disc is arranged near the lower end in the reaction tower, two slide rods are correspondingly installed on the inner wall of the reaction tower above the placing disc, a slide seat is slidably installed on each slide rod, an installation block is installed on the side surface of each slide seat, a circular hole is formed in the side surface of each installation block, a movable rod is slidably arranged in each circular hole, a limiting plate is commonly installed at the lower end of the four movable rods, a first spring is arranged on the surface of each movable rod before the installation block and the limiting plate, and a limiting plate is installed at the upper end of each movable rod.

[0007] As a further technical scheme of the present application, a first horizontal plate is commonly installed on the upper surfaces of the two slide seats, a second horizontal plate is installed on one side of the first horizontal plate, a pulley is installed on the side surface of the second horizontal plate, a horizontal rod extending to the outside of the reaction tower is installed on the other side surface of the second horizontal plate on one side of the pulley, a cavity is formed in the horizontal rod, a metal block is slidably installed in the cavity, a steel wire rope is installed on the side surface of the metal block, and the other end of the steel wire rope extends to the outside of the horizontal rod, passes around the pulley, and is fixedly connected with the limiting plate.

[0008] As a further technical scheme of the present application, a sealing plate is installed in the reaction tower above the two slide rods, a magnet adapted to the metal block is embedded in the lower surface of the sealing plate, one side of the sealing plate extends to the outside of the reaction tower and is installed with a side plate, and two rectangular blocks are correspondingly installed on one side of the sealing plate on the front and rear surfaces of the reaction tower.

[0009] As a further technical scheme of the present application, one of the rectangular blocks in each group is installed with a motor on the side surface, a screw rod having the other end rotatably connected with the other rectangular block is installed on the drive end of each motor and penetrates the rectangular block, a threaded seat is arranged on each screw rod, and a fixed plate fixedly connected with the side plate is installed on the side surface of each threaded seat.

[0010] The lower plate is provided below the reaction tower, the extension rods are fixedly connected with the placing disc and are arranged on the upper surface corners of the lower plate, the second springs are sleeved between the extension rods and the reaction tower, and the vibration motor is arranged on the upper surface of the reaction tower and above the lower plate.

[0011] The first mounting seat is arranged on the upper surface of the reaction tower and one side of the airflow box, the transmission rod is arranged on one end of the shaft rod and extends to the outside of the airflow box and penetrates through the first mounting seat, the first bevel gear is arranged on the end of the transmission rod, the second mounting seat is arranged on the side of the mounting plate and corresponds to the side of the reaction tower, the round rod is rotatably arranged on the second mounting seat, and the second bevel gear is arranged on one end of the round rod and meshes with the first bevel gear.

[0012] The second synchronous wheel is arranged on the side of the mounting plate and one side of the disc, the first synchronous wheel is rotatably arranged on the side of the mounting plate and one side of the second synchronous wheel, the fourth bevel gear is arranged on the side of the first synchronous wheel, the synchronous belt is arranged on the first synchronous wheel and the second synchronous wheel, the third bevel gear is arranged on the other end of the round rod and meshes with the fourth bevel gear, the air outlet pipe is arranged on the front surface of the reaction tower and below the fixing plate, the valve is arranged on the air outlet pipe, the through holes are arranged on the two sides of the placing disc, the multi-way pipes are arranged on the through holes, the dust suction pump is arranged on one end of the multi-way pipe and extends to the outside, the grinding paper is arranged on the lower surface of the limiting plate and the inner bottom surface of the placing disc, and the filter screen is arranged on the through hole.

[0013] Specifically, the following steps are included:

[0014] S1, the silver catalyst is placed in the placing disc, when the mixed gas of methanol and air enters the airflow box through the input end of the airflow box, the airflow drives the shaft rod to rotate through the fan blades, the rotating shaft rod drives the transmission rod to rotate, then the rotating transmission rod drives the round rod to rotate through the first bevel gear and the second bevel gear, the rotating round rod drives the first synchronous wheel to rotate through the third bevel gear and the fourth bevel gear, the rotating first synchronous wheel drives the second synchronous wheel to rotate through the synchronous belt, and the rotating second synchronous wheel drives the disc to rotate.

[0015] S2, the mixed gas entering the air flow box passes through the air flow box output end into the reaction tower, and is above the sealing plate, and the rotating disc drives the second connecting rod to move left and right through the first connecting rod, the moving second connecting rod drives the first horizontal plate to move left and right through the electromagnet, the moving first horizontal plate drives the limiting plate to move left and right through the sliding seat, and then the left and right moving limiting plate drives the silver particles laid on the placing disc to roll left and right, and because the lower surface of the limiting plate and the inner bottom surface of the placing disc are provided with polishing paper, the silver particles are polished by the upper and lower polishing paper during rolling, and the silver sulfide powder on the surface of the silver particles is polished, and then the dust collection pump removes the silver sulfide powder polished from the placing disc through the multi-way pipe and the through hole;

[0016] S3, when the methanol mixed gas capacity in the upper cavity of the reaction tower reaches the accommodation threshold, stop feeding the mixed gas to the air flow box, stop energizing the electromagnet, release the connection between the electromagnet and the first horizontal plate, and the two motors drive the two screws to rotate, the rotating screw drives the threaded seat to move, and then drives the sealing plate to move, the moving sealing plate drives the magnet to move, when the moving magnet moves to the upper side of the metal block, the moving magnet continues to drive the metal block to move in the cavity due to magnetic force, the moving metal block pulls up the limiting plate through the steel wire rope, the rising limiting plate compresses the four first springs, until the metal block moves to the other end of the cavity, at this time the limiting plate moves to the outside of the placing disc, and the magnet drives the cross bar to move through the metal block, the moving cross bar drives the two sliding seats to move, and the moving sliding seat drives the limiting plate to move out of the upper side of the placing disc;

[0017] S4, when the sealing plate moves out of the reaction tower, the methanol mixed gas above it descends, and then the vibration motor operates to drive the placing disc to vibrate up and down through the extension rod and the second spring, so that the silver particles in the placing disc vibrate slightly, so that the surface of the silver particles can be in contact with the air, when the methanol and air mixed gas contacts the silver particle catalyst, the methanol and air mixed gas reacts to generate formaldehyde gas under the action of the catalyst, after a period of time, open the valve to discharge the generated formaldehyde gas from the gas outlet pipe;

[0018] S5, then the two motors drive the screws to reverse, the sealing plate moves reversely through the magnet, the metal block reversely moves due to the reverse movement of the sealing plate, and the limiting plate is limited by the edge of the placing disc, and then the sealing plate drives the cross bar to move reversely through the magnet and the metal block, the reversely moving cross bar drives the limiting plate to move reversely, when there is no edge limiting of the placing disc, all the first springs rebound to drive the limiting plate to restore to the original position into the placing disc, until the sealing plate restores to the original position, at this time the limiting plate restores to the original position, and the electromagnet contacts the first horizontal plate, so that the above operation can be repeated for the next reaction.

[0019] Advantages

[0020] The present application provides a device for preparing aqueous formaldehyde solution. Compared with the prior art, the following beneficial effects are achieved:

[0021] 1. A device for preparing aqueous formaldehyde solution, by entering the gas flow box through the methanol mixed gas, rotating the shaft through the fan blade, then rotating the disc through the transmission assembly, and moving the polishing plate left and right through the two connecting rods, the left and right moving polishing plate drives the silver particles on the placement plate to roll left and right, and the polishing paper on the polishing plate and the polishing paper on the placement plate are used to polish the surface of the rolling silver particles, and the silver sulfide powder on the surface of the silver particles is polished off, achieving the purpose of cleaning the silver sulfide on the surface of the silver particle catalyst, and the silver sulfide powder on the surface of the silver particle catalyst can be polished and removed before each reaction, avoiding the attachment of these powders on the surface of the silver particles affecting the catalytic speed, so that the reaction tower produces formaldehyde at the fastest speed all the time, and in the process of moving the sealing plate, the polishing plate can be moved up and then moved to the right to move out of the area directly above the placement plate through the assembly, and then the mixed gas can contact the silver catalyst when it descends, avoiding the polishing plate hindering the contact of the mixed gas with the silver particle catalyst, and when the position of the sealing plate is restored, the position of the polishing plate can also be restored, without affecting the subsequent operation. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of a device for preparing aqueous formaldehyde solution.

[0023] Figure 2 It is a side view of a device for preparing aqueous formaldehyde solution.

[0024] Figure 3 It is a schematic diagram of the internal structure of a device for preparing aqueous formaldehyde solution.

[0025] Figure 4 It is a schematic diagram of the polishing assembly structure of a device for preparing aqueous formaldehyde solution.

[0026] Figure 5 It is a schematic diagram of the air flow box structure of a device for preparing aqueous formaldehyde solution.

[0027] Figure 6 It is a schematic diagram of the sealing plate assembly structure of a device for preparing aqueous formaldehyde solution.

[0028] Figure 7 It is a sectional view of a device for preparing aqueous formaldehyde solution.

[0029] Figure 8 It is a sectional view of a device for preparing aqueous formaldehyde solution with the sealing plate open.

[0030] Figure 9 It is Figure 2 A portion of the enlarged view of the middle A.

[0031] Fig. 1, reaction tower; 2, air flow box; 3, shaft; 4, fan blade; 5, mounting plate; 6, disc; 7, first connecting rod; 8, second connecting rod; 9, placing disc; 10, slide rod; 11, slide base; 12, mounting block; 13, movable rod; 14, first spring; 15, limiting plate; 16, polishing plate; 17, through hole; 18, multi-way pipe; 19, dust suction pump; 20, sealing plate; 21, magnet; 22, electromagnet; 23, first cross plate; 24, second cross plate; 25, pulley; 26, cross rod; 27, cavity; 28, metal block; 29, steel wire rope; 30, side plate; 31, rectangular block; 32, motor; 33, screw rod; 34, threaded seat; 35, fixed plate; 36, lower plate; 37, extension rod; 38, second spring; 39, vibration motor; 40, first mounting seat; 41, transmission rod; 42, first bevel gear; 43, second mounting seat; 44, round rod; 45, second bevel gear; 46, third bevel gear; 47, first synchronous wheel; 48, second synchronous wheel; 49, synchronous belt; 50, fourth bevel gear; 51, air outlet pipe; 52, valve. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without creative work are within the protection scope of the present application.

[0033] Please refer to Figures 1-9The application provides a device for preparing a formaldehyde aqueous solution, which comprises a reaction tower 1, an airflow box 2 installed on the upper surface of the reaction tower 1 and communicated with the reaction tower 1, a shaft rod 3 rotatably installed in the airflow box 2, a plurality of fan blades 4 uniformly distributed on the side surface of the shaft rod 3, a mounting plate 5 installed on the side surface of the reaction tower 1, a disc 6 rotatably installed on the side surface of the mounting plate 5, a transmission assembly arranged between the airflow box 2 and the disc 6, a first connecting rod 7 rotatably installed on the side edge of the disc 6, a second connecting rod 8 rotatably installed at the other end of the first connecting rod 7 and extending into the reaction tower 1, a first cross plate 23 installed at the end of the second connecting rod 8, a placing disc 9 arranged near the lower end of the reaction tower 1, two slide rods 10 correspondingly installed on the inner wall of the reaction tower 1 and above the placing disc 9, a sliding seat 11 slidably installed on each slide rod 10, a mounting block 12 installed on the side surface of each sliding seat 11, a circular hole formed in the side surface of each mounting block 12, a movable rod 13 slidably arranged in each circular hole, a limiting plate 16 jointly installed at the lower ends of the four movable rods 13, a first spring 14 arranged on the surface of each movable rod 13 and before the mounting block 12 and the limiting plate 16, a limiting plate 15 installed at the upper end of each movable rod 13, a first mounting seat 40 installed on the upper surface of the reaction tower 1 and on one side of the airflow box 2, a transmission rod 41 installed at one end of the shaft rod 3 and extending out of the airflow box 2 and penetrating through the first mounting seat 40, a first bevel gear 42 installed at the end of the transmission rod 41, two second mounting seats 43 correspondingly installed on the side surface of the reaction tower 1 and on one side of the mounting plate 5, a round rod 44 rotatably installed on the two second mounting seats 43, a second bevel gear 45 installed at one end of the round rod 44 and meshing with the first bevel gear 42, a second synchronous wheel 48 installed on the side surface of the mounting plate 5 and on one side of the disc 6, a first synchronous wheel 47 rotatably installed on the side surface of the mounting plate 5 and on one side of the second synchronous wheel 48, a fourth bevel gear 50 installed on the side surface of the first synchronous wheel 47, a synchronous belt 49 jointly arranged on the first synchronous wheel 47 and the second synchronous wheel 48, a third bevel gear 46 installed at the other end of the round rod 44 and meshing with the fourth bevel gear 50, and in use, when the mixed gas of methanol and air enters the airflow box 2 through the input end of the airflow box 2, the airflow drives the shaft rod 3 to rotate through the fan blades 4, the rotating shaft rod 3 drives the transmission rod 41 to rotate, then the first bevel gear 42 and the second bevel gear 45 drive the round rod 44 to rotate, the rotating round rod 44 drives the first synchronous wheel 47 to rotate through the third bevel gear 46 and the fourth bevel gear 50, the rotating first synchronous wheel 47 drives the second synchronous wheel 48 to rotate through the synchronous belt 49, the rotating second synchronous wheel 48 drives the disc 6 to rotate, the mixed gas in the airflow box 2 enters the reaction tower 1 through the output end of the airflow box 2 and above the sealing plate 20, meanwhile, the rotating disc 6 drives the second connecting rod 8 to move left and right through the first connecting rod 7, the moving second connecting rod 8 drives the first cross plate 23 to move left and right through the electromagnet 22,The first horizontal plate 23 is driven by the sliding seat 11 to move the limiting plate 16.

[0034] Please refer to Figures 3-4 , Figures 6-8 , the upper surface of the two sliding seats 11 is provided with the first horizontal plate 23, the upper surface of the two sliding seats 11 is provided with the second horizontal plate 24 on one side of the first horizontal plate 23, the side surface of the second horizontal plate 24 is provided with the pulley 25, the other side surface of the second horizontal plate 24 is provided with the cross bar 26 extending to the outside of the reaction tower 1 on one side of the pulley 25, the cross bar 26 is provided with the cavity 27, the metal block 28 is slidably installed in the cavity 27, the side surface of the metal block 28 is provided with the steel wire rope 29, the other end of the steel wire rope 29 extends to the outside of the cross bar 26, passes through the pulley 25 and is fixedly connected with the limiting plate 16, the inside of the reaction tower 1 is provided with the sealing plate 20 above the two sliding rods 10, the lower surface of the sealing plate 20 is embedded with the magnet 21 matched with the metal block 28, one side of the sealing plate 20 extends to the outside of the reaction tower 1 and is provided with the side plate 30, the front and back surfaces of the reaction tower 1 are both provided with two rectangular blocks 31 on one side of the sealing plate 20, the side surface of one rectangular block 31 in each group is provided with the motor 32, the driving end of each motor 32 penetrates through the rectangular block 31 and is provided with the screw rod 33 having the other end rotationally connected with the other rectangular block 31, each screw rod 33 is provided with the threaded seat 34, the side surface of each threaded seat 34 is provided with the fixed plate 35 fixedly connected with the side plate 30, in use, the two motors 32 drive the two screw rods 33 to rotate, the rotating screw rod 33 drives the threaded seat 34 to move, thereby driving the sealing plate 20 to move, the moving sealing plate 20 drives the magnet 21 to move, when the moving magnet 21 moves above the metal block 28, the moving magnet 21 continues to drive the metal block 28 to move in the cavity 27 due to the magnetic force, the moving metal block 28 pulls the limiting plate 16 to rise through the steel wire rope 29, the rising limiting plate 16 compresses the four first springs 14, until the metal block 28 moves to the other end of the cavity 27, at this time, the limiting plate 16 moves to the outside of the placing disc 9, at the same time, the magnet 21 drives the cross bar 26 to move through the metal block 28, the moving cross bar 26 drives the two sliding seats 11 to move, the moving sliding seat 11 drives the limiting plate 16 to move out of above the placing disc 9.

[0035] Please refer to Figures 7-8 , the lower plate 36 is arranged below the reaction tower 1, the upper surface of the lower plate 36 is provided with the extension rod 37 extending to the inside of the reaction tower 1 and fixedly connected with the placing disc 9, each extension rod 37 is sleeved with the second spring 38 between the reaction tower 1 and the lower plate 36, the upper surface of the reaction tower 1 is provided with the vibration motor 39 above the lower plate 36, in use, the vibration motor 39 drives the placing disc 9 to vibrate up and down with small amplitude through the extension rod 37 and the second spring 38, thereby making the silver particles in the placing disc 9 vibrate with small amplitude.

[0036] Please refer to Figures 1-2 The front surface of the reaction tower 1 is provided with an air outlet pipe 51 below the fixed plate 35, the air outlet pipe 51 is provided with a valve 52, a group of through holes 17 are formed on both sides of the placement disc 9, a plurality of multi-way pipes 18 are installed at the ports of each group of through holes 17, one end of each multi-way pipe 18 extends to the outside of the 1 and is provided with a dust suction pump 19, the lower surface of the limiting plate 16 and the inner bottom surface of the placement disc 9 are provided with grinding paper, and a filter screen is arranged at the port of each through hole 17. In use, open the valve 52 and discharge the generated formaldehyde gas from the air outlet pipe 51.

[0037] Specifically includes the following steps:

[0038] S1, the silver catalyst is placed in the placement disc 9, when the mixed gas of methanol and air enters the airflow box 2 through the input end of the airflow box 2, the airflow drives the shaft 3 to rotate through the fan blade 4, the rotating shaft 3 drives the transmission rod 41 to rotate, then the first bevel gear 42 and the second bevel gear 45 drive the round rod 44 to rotate, the rotating round rod 44 drives the first synchronous wheel 47 to rotate through the third bevel gear 46 and the fourth bevel gear 50, the rotating first synchronous wheel 47 drives the second synchronous wheel 48 to rotate through the synchronous belt 49, and the rotating second synchronous wheel 48 drives the disc 6 to rotate;

[0039] S2, the mixed gas entering the airflow box 2 enters the reaction tower 1 through the output end of the airflow box 2 and is above the sealing plate 20, at the same time, the rotating disc 6 drives the second connecting rod 8 to move left and right through the first connecting rod 7, the moving second connecting rod 8 drives the first horizontal plate 23 to move left and right through the electromagnet 22, the moving first horizontal plate 23 drives the limiting plate 16 to move left and right through the sliding seat 11, and then the limiting plate 16 moving left and right drives the silver particles laid on the placement disc 9 to roll left and right, and because the lower surface of the limiting plate 16 and the inner bottom surface of the placement disc 9 are provided with grinding paper, the silver particles are ground by the upper and lower grinding papers during the rolling process of each silver particle, the silver sulfide powder on the surface of the silver particles is ground off, and then the running dust suction pump 19 sucks away the silver sulfide powder ground off from the silver particles in the placement disc 9 through the multi-way pipe 18 and the through hole 17;

[0040] S3, when the methanol mixed gas volume in the upper cavity of the reaction tower 1 reaches the accommodation threshold, stop delivering the mixed gas to the gas flow box 2, stop energizing the electromagnet 22, release the connection between the electromagnet 22 and the first horizontal plate 23, the two motors 32 drive the two screw rods 33 to rotate, the rotating screw rods 33 drive the threaded seats 34 to move, and then drive the sealing plate 20 to move, the moving sealing plate 20 drives the magnet 21 to move, when the moving magnet 21 moves to the upper side of the metal block 28, the moving magnet 21 continues to drive the metal block 28 to move in the cavity 27 due to the magnetic force, the moving metal block 28 pulls the limiting plate 16 up through the steel wire rope 29, the rising limiting plate 16 compresses the four first springs 14, until the metal block 28 moves to the other end of the cavity 27, at this time the limiting plate 16 moves to the outside of the placement disc 9, and at the same time the magnet 21 drives the cross rod 26 to move through the metal block 28, the moving cross rod 26 drives the two sliding seats 11 to move, and the moving sliding seat 11 drives the limiting plate 16 to move out of the upper side of the placement disc 9;

[0041] S4, when the sealing plate 20 moves out of the reaction tower 1, the methanol mixed gas above it descends, then the vibration motor 39 operates to vibrate the placement disc 9 up and down with a small amplitude through the extension rod 37 and the second spring 38, and then the silver particles in the placement disc 9 are vibrated with a small amplitude, so that the surface of the silver particles can be fully contacted with the air, when the methanol mixed gas contacts the silver particle catalyst, the methanol reacts to generate formaldehyde gas under the action of the catalyst, after a period of time, open the valve 52, and the generated formaldehyde gas is discharged from the gas outlet pipe 51;

[0042] S5, then the two motors 32 drive the screw rods 33 to reverse, the sealing plate 20 moves reversely through the above operation, the reversely moving sealing plate 20 drives the metal block 28 to move reversely through the magnet 21, because the placement disc 9 limits the lower surface of the limiting plate 16 to be on the edge of the placement disc 9, then the sealing plate 20 drives the cross rod 26 to move reversely through the magnet 21 and the metal block 28, the reversely moving cross rod 26 drives the limiting plate 16 to move reversely, when there is no placement disc 9 edge limiting, all the first springs 14 rebound to drive the limiting plate 16 to restore to the original position in the placement disc 9, until the sealing plate 20 restores to the original position, at this time the limiting plate 16 restores to the original position, and the electromagnet 22 contacts the first horizontal plate 23, so that the above operation can be repeated for the next reaction.

Claims

1. An apparatus for preparing an aqueous formaldehyde solution comprising a reaction column (1), characterized in that, The upper surface of the reaction tower (1) is provided with an airflow box (2) communicated with the reaction tower (1), the shaft rod (3) is rotatably arranged in the airflow box (2), a plurality of fan blades (4) are uniformly arranged on the side surface of the shaft rod (3), the mounting plate (5) is arranged on the side surface of the reaction tower (1), the disc (6) is rotatably arranged on the side surface of the mounting plate (5), the transmission assembly is arranged between the airflow box (2) and the disc (6), the first connecting rod (7) is rotatably arranged on the side edge of the disc (6), the second connecting rod (8) is rotatably arranged on the other end of the first connecting rod (7) and extends into the reaction tower (1), the first cross plate (23) is arranged on the end of the second connecting rod (8), the placing disc (9) is arranged in the reaction tower (1) and close to the lower end, the two slide rods (10) are arranged on the inner wall of the reaction tower (1) and above the placing disc (9), the slide seat (11) is slidably arranged on each slide rod (10), the mounting block (12) is arranged on the side surface of each slide seat (11), the circular hole is formed in the side surface of each mounting block (12), the movable rod (13) is slidably arranged in each circular hole, the second limiting plate (16) is arranged on the lower ends of the four movable rods (13), the first spring (14) is arranged on the surface of each movable rod (13) and before the mounting block (12) and the second limiting plate (16), the first limiting plate (15) is arranged on the upper end of each movable rod (13), the grinding paper is arranged on the lower surface of the second limiting plate (16) and the inner bottom surface of the placing disc (9), the methanol mixed gas enters the airflow box, the shaft rod is driven to rotate by the fan blades, then the disc is driven to rotate by the transmission assembly, the second limiting plate (16) is driven to move left and right by the two connecting rods, the second limiting plate (16) moving left and right drives the silver particles on the placing disc to roll left and right, the grinding paper on the second limiting plate (16) and the grinding paper on the placing disc are used to grind the surface of the rolling silver particles, the silver sulfide powder on the surface of the silver particles is ground off, the purpose of cleaning the silver sulfide on the surface of the silver particle catalyst is achieved, the silver sulfide powder on the surface of the silver particle catalyst is ground off before each reaction, the powder is prevented from adhering to the surface of the silver particles and affecting the catalytic speed, and the reaction tower is kept in the fastest state for producing formaldehyde.

2. A device for preparing an aqueous formaldehyde solution according to claim 1, characterized in that The upper surfaces of the two sliding seats (11) are provided with a first horizontal plate (23) together, and the upper surfaces of the two sliding seats (11) are provided with a second horizontal plate (24) on one side of the first horizontal plate (23), the side surface of the second horizontal plate (24) is provided with a pulley (25), the other side surface of the second horizontal plate (24) is provided with a horizontal rod (26) extending to the outside of the reaction tower (1) on one side of the pulley (25), the horizontal rod (26) is provided with a cavity (27) therein, a metal block (28) is slidably arranged in the cavity (27), the side surface of the metal block (28) is provided with a steel wire rope (29), and the other end of the steel wire rope (29) extends to the outside of the horizontal rod (26) and is fixedly connected with the second limiting plate (16) by passing through the pulley (25).

3. A device for preparing an aqueous formaldehyde solution according to claim 2, characterized in that The inside of the reaction tower (1) is provided with a sealing plate (20) above the two sliding rods (10), the lower surface of the sealing plate (20) is embedded with a magnet (21) matched with the metal block (28), one side of the sealing plate (20) extends to the outside of the reaction tower (1) and is provided with a side plate (30), and the front and rear surfaces of the reaction tower (1) are both provided with two rectangular blocks (31) on one side of the sealing plate (20).

4. A device for preparing an aqueous formaldehyde solution according to claim 3, characterized in that The side surface of one of the rectangular blocks (31) in each group is provided with a motor (32), the driving end of each motor (32) penetrates the rectangular block (31) and is provided with a screw rod (33) having the other end rotatably connected with the other rectangular block (31), a threaded seat (34) is arranged on each screw rod (33), and the side surface of each threaded seat (34) is provided with a fixed plate (35) fixedly connected with the side plate (30).

5. A device for producing an aqueous formaldehyde solution according to claim 4, characterized in that The reaction tower (1) is provided below with a lower plate (36), the upper surface of the lower plate (36) is provided at the corners with extension rods (37) extending into the reaction tower (1) and fixedly connected with the placing disc (9), a second spring (38) is sleeved on each extension rod (37) between the reaction tower (1) and the lower plate (36), and the upper surface of the reaction tower (1) is provided above the lower plate (36) with a vibration motor (39).

6. A device for preparing an aqueous formaldehyde solution according to claim 5, characterized in that The upper surface of the reaction tower (1) is provided on one side of the airflow box (2) with a first mounting seat (40), one end of the shaft rod (3) is provided with a transmission rod (41) extending to the outside of the airflow box (2) and penetrating the first mounting seat (40), the end of the transmission rod (41) is provided with a first bevel gear (42), the side surface of the reaction tower (1) is provided on one side of the mounting plate (5) with two second mounting seats (43), a circular rod (44) is rotatably arranged on the two second mounting seats (43), and one end of the circular rod (44) is provided with a second bevel gear (45) engaged with the first bevel gear (42).

7. A device for preparing an aqueous formaldehyde solution according to claim 6, characterized in that The side of the mounting plate (5) is provided with a second synchronous wheel (48) penetrating through the mounting plate (5) and connected with the mounting plate (5), the side of the mounting plate (5) is rotatably provided with a first synchronous wheel (47) on the side of the second synchronous wheel (48), the side of the first synchronous wheel (47) is provided with a fourth bevel gear (50), the first synchronous wheel (47) and the second synchronous wheel (48) are provided with a synchronous belt (49) in common, the other end of the round rod (44) is provided with a third bevel gear (46) engaged with the fourth bevel gear (50), the front surface of the reaction tower (1) is provided with an air outlet pipe (51) below the fixing plate (35), the air outlet pipe (51) is provided with a valve (52), the both sides of the placing disc (9) are provided with a group of through holes (17), each group of the through holes (17) is provided with a multi-way pipe (18) in common at the port, one end of each multi-way pipe (18) extends to the outside of the reaction tower (1) and is provided with a dust suction pump (19), and each through hole (17) is provided with a filter screen at the port.

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