Air inducing device for treating isooctyl chloroformate tail gas

Abstract

The utility model relates to an air inducing device for isooctyl chloroformate tail gas treatment, which comprises a tail gas discharge header pipe, two groups of pre-treatment mechanisms, a middle pipe, two groups of air inducing mechanisms and a tail gas conveying header pipe, two first branch pipes are connected in parallel to the tail end of the tail gas discharge header pipe, two second branch pipes are connected in parallel to the head end of the middle pipe, and two third branch pipes are connected in parallel to the tail end of the middle pipe. The front treatment mechanism comprises an absorption tank, the absorption tank is divided into a first absorption chamber and a second absorption chamber through a partition plate, the two first branch pipes are in one-to-one correspondence with the two first absorption chambers, and the tail ends of the first branch pipes extend into the lower portions of the corresponding first absorption chambers; the first absorption chambers are communicated with the second absorption chambers in the same group through inverted U-shaped pipes, the two second branch pipes are in one-to-one correspondence with the two second absorption chambers, and the head ends of the second branch pipes extend into the upper parts of the corresponding second absorption chambers. According to the utility model, the damage to the induced draft fan can be reduced by pre-treating the tail gas, and the whole device is more flexible and convenient to use.

Description

TECHNICAL FIELD

[0001] The utility model belongs to tail gas treatment technical field, concretely relates to a kind of air induction device for isooctyl chloroformate tail gas treatment. BACKGROUND

[0002] Chloroformate compounds mainly include methyl chloroformate, ethyl chloroformate, propyl chloroformate, isopropyl chloroformate, n-butyl chloroformate and isooctyl chloroformate, etc. Among them, isooctyl chloroformate, also known as chloroformic acid-2-ethylhexyl ester or 2-ethylhexyl chloroformate, is an important organic compound, widely used in pharmaceutical, chemical and other fields.

[0003] At present, isooctyl chloroformate is mainly synthesized by esterification reaction of phosgene and isooctanol in a reaction kettle or an esterification tower, and the tail gas containing by-product hydrogen chloride and excess phosgene generated in the reaction needs to be led away for centralized treatment. However, in actual treatment, the tail gas is usually directly extracted from the reaction system by a vacuum pump or an air induction fan and then transported to the subsequent treatment system, which causes serious corrosion of the air induction equipment by the tail gas and seriously affects the service life of the air induction equipment, and thus needs to be improved. UTILITY MODEL CONTENT

[0004] Therefore, the utility model aims to provide an air induction device for isooctyl chloroformate tail gas treatment, which can reduce the damage to the air induction fan through pre-treatment of the tail gas and is more flexible and convenient to use as a whole, so as to solve the above problems.

[0005] In order to realize the above-mentioned purpose, the utility model adopts the technical scheme of a kind of air induction device for isooctyl chloroformate tail gas treatment, including tail gas discharge main pipe, two groups of front processing mechanism, intermediate pipe, two groups of air induction mechanism and tail gas conveying main pipe, and the tail end of the tail gas discharge main pipe is connected with two first branch pipes in parallel, the first end of the intermediate pipe is connected with two second branch pipes in parallel, the tail end is connected with two third branch pipes in parallel, the first end of the tail gas conveying main pipe is connected with two fourth branch pipes in parallel, control valve is equipped on the first branch pipe, second branch pipe, third branch pipe and fourth branch pipe, and the front processing mechanism includes absorption tank, the absorption tank is divided into first absorption chamber and second absorption chamber by the partition plate being vertically fixed in its inside, first absorption liquid is contained in the first absorption chamber, second absorption liquid is contained in the second absorption chamber, the upper portion of one side of the first absorption chamber and the second absorption chamber is connected with the liquid inlet pipe with liquid inlet valve, the bottom is connected with the liquid outlet pipe with liquid outlet valve, two first branch pipes and the first absorption chamber of two groups of front processing mechanism are one-to-one corresponding, and the tail end of first branch pipe extends into the lower portion of corresponding first absorption chamber, first absorption chamber is communicated with the second absorption chamber of same group by inverted U-shaped pipe, and one end of inverted U-shaped pipe is located in the upper portion of first absorption chamber, the other end is located in the lower portion of second absorption chamber, two second branch pipes and the second absorption chamber of two groups of front processing mechanism are one-to-one corresponding, and the first end of second branch pipe extends into the upper portion of corresponding second absorption chamber, the tail end of two third branch pipes is connected with air inlet hose, and the first end of two fourth branch pipes is connected with air outlet hose, the air induction mechanism includes support base, air induction machine is detachably arranged on the support base, two air inlet hoses and the air inlet of the air induction machine of two groups of air induction mechanism are one-to-one corresponding and are connected by air inlet quick connector, two air outlet hoses and the air outlet of the air induction machine of two groups of air induction mechanism are one-to-one corresponding and are connected by air outlet quick connector.

[0006] Preferably, the top center of the support base is provided with a positioning blind groove, and a hydraulic cylinder is embedded on one side of the bottom, a threaded hole is formed in the support base on one side of the positioning blind groove, and a threaded blind hole is formed in the support base on the other side, the threaded hole and the threaded blind hole correspond to each other and are communicated with the positioning blind groove, the piston rod of the hydraulic cylinder is fixedly connected with a vertical plate, a motor is fixedly arranged on the upper portion of the vertical plate, the output shaft of the motor faces the support base and is coaxially fixedly connected with a screw rod, the screw rod corresponds to the threaded hole, the air induction machine is fixedly arranged on a mounting plate, the mounting plate abuts on the top of the support base and a positioning plate is fixedly arranged on the bottom thereof, the positioning plate is inserted into the positioning blind groove and a limiting threaded hole is formed through the position corresponding to the threaded hole, and the screw rod can be screwed into the threaded hole, the limiting threaded hole and the threaded blind hole.

[0007] Preferably, the positioning plate is matched with the positioning blind groove.

[0008] Preferably, the screw rod is matched with the threaded hole, the limiting threaded hole and the threaded blind hole.

[0009] Preferably, the support base is made of foamed aluminum.

[0010] The beneficial effects of the utility model are: during the air induction operation, the first end of the tail gas discharge main pipe is connected with the tail gas discharge port of the isooctyl chloroformate synthesis reaction device, the tail end of the tail gas conveying main pipe is connected with the gas inlet of the post-treatment system of the tail gas, one set of the pre-treatment mechanism is used as a backup, and one set of the air induction mechanism is used as a backup; the control valves on the first branch pipe and the second branch pipe corresponding to one set of the pre-treatment mechanism are opened, the control valves on the first branch pipe and the second branch pipe corresponding to the other set of the pre-treatment mechanism are closed, the control valves on the third branch pipe and the fourth branch pipe corresponding to one set of the air induction mechanism are opened, and the control valves on the third branch pipe and the fourth branch pipe corresponding to the other set of the air induction mechanism are closed, so that the working state of one set of the pre-treatment mechanism being used as a backup and one set of the air induction mechanism being used as a backup is formed. Then, under the pumping of the air induction fan, the tail gas can enter the lower part of the first absorption chamber of the corresponding absorption tank through the tail gas discharge main pipe and the unblocked first branch pipe and flow from bottom to top, so that the first absorption liquid can be used to effectively absorb and remove the phosgene component in the tail gas. Then, the tail gas can enter the lower part of the second absorption chamber through the inverted U-shaped pipe and flow from bottom to top again. Thus, the second absorption liquid can be used to effectively absorb and remove the hydrogen chloride component in the tail gas. Then, the tail gas can be conveyed to the tail gas conveying main pipe through the unblocked second branch pipe, the intermediate pipe, the third branch pipe, the air induction fan and the fourth branch pipe, and finally conveyed to the post-treatment system by the tail gas conveying main pipe. In this way, the harmful components in the tail gas can be effectively absorbed and removed before the tail gas enters the air induction fan, the corrosion and damage of the tail gas to the air induction fan can be greatly reduced, and the service life of the air induction fan can be ensured. In addition, when the first absorption liquid and the second absorption liquid are saturated, the corresponding absorption liquid can be discharged and supplemented through the liquid inlet pipe and the liquid outlet pipe on the corresponding absorption chamber, and when the absorption liquid is replaced, the control valves on the first branch pipe and the second branch pipe corresponding to the pre-treatment mechanism can be closed to stop the operation of the pre-treatment mechanism, and the control valves on the first branch pipe and the second branch pipe corresponding to the other pre-treatment mechanism can be opened to make the other pre-treatment mechanism operate. When the air induction fan needs to be replaced due to failure, the control valves on the third branch pipe and the fourth branch pipe corresponding to the current air induction fan can be closed to stop the operation of the air induction mechanism, and the control valves on the third branch pipe and the fourth branch pipe corresponding to the other air induction mechanism can be opened to make the other air induction mechanism operate. After the failed air induction fan stops working, the connection between the air inlet and the air outlet of the air induction fan and the corresponding air inlet hose and air outlet hose can be quickly disconnected through the corresponding air inlet quick connector and air outlet quick connector, and the air induction fan can be disassembled and replaced through the detachable connection between the air induction fan and the support base. In this way, the use of the device as a whole is more flexible and convenient, and the device is more practical. BRIEF DESCRIPTION OF DRAWINGS

[0011] Fig. 1is the main view structural schematic diagram of the utility model;

[0012] Fig. 2 is the main view structural schematic diagram of the utility model absorption tank;

[0013] Fig. 3 is the main view structural schematic diagram of the utility model support base;

[0014] Fig. 4 is the main view structural schematic diagram of the utility model installation plate;

[0015] Fig. 5 is the main view structural schematic diagram of the utility model installation plate and support base connection.

[0016] In the drawing, 1 is tail gas discharge main pipe, 2 is front treatment mechanism, 3 is intermediate pipe, 4 is induced draft mechanism, 5 is tail gas conveying main pipe, 6 is first branch pipe, 7 is second branch pipe, 8 is third branch pipe, 9 is fourth branch pipe, 10 is control valve, 11 is absorption tank, 12 is partition, 13 is first absorption chamber, 14 is second absorption chamber, 15 is first absorption liquid, 16 is second absorption liquid, 17 is liquid inlet valve, 18 is liquid inlet pipe, 19 is liquid outlet valve, 20 is liquid outlet pipe, 21 is inverted U-shaped pipe, 22 is air inlet hose, 23 is exhaust hose, 24 is support base, 25 is induced draft fan, 26 is air inlet quick connector, 27 is exhaust quick connector, 28 is positioning blind groove, 29 is hydraulic cylinder, 30 is threaded through hole, 31 is threaded blind hole, 32 is vertical plate, 33 is motor, 34 is screw rod, 35 is installation plate, 36 is positioning plate, 37 is limit threaded hole. DETAILED DESCRIPTION

[0017] The utility model will be described further in detail in combination with the drawings and specific embodiment:

[0018] As Figs. 1 to 5The device is shown, a chloroformic acid isopropyl ester tail gas treatment with air induction device, including tail gas discharge main pipe 1, two groups of front processing mechanism 2, intermediate pipe 3, two groups of air induction mechanism 4 and tail gas conveying main pipe 5.Tail gas discharge main pipe 1's tail end is parallelly connected with two first branch pipes 6, the first end of intermediate pipe 3 is parallelly connected with two second branch pipes 7, the tail end is parallelly connected with two third branch pipes 8, the first end of tail gas conveying main pipe 5 is parallelly connected with two fourth branch pipes 9, and control valve 10 is arranged on the first branch pipe 6, the second branch pipe 7, the third branch pipe 8 and the fourth branch pipe 9.The front processing mechanism 2 includes absorption tank 11, absorption tank 11 is divided into first absorption chamber 13 and second absorption chamber 14 by the vertical fixedly arranged partition 12 in its inside, first absorption chamber 13 is filled with first absorption liquid 15, second absorption chamber 14 is filled with second absorption liquid 16, and the upper part of one side of first absorption chamber 13 and second absorption chamber 14 is communicated with liquid inlet pipe 18 with liquid inlet valve 17, and the bottom is communicated with liquid outlet pipe 20 with liquid outlet valve 19.Two first branch pipes 6 and two groups of front processing mechanism 2's first absorption chamber 13 one by one correspond and the tail end of first branch pipe 6 extends into the lower part of corresponding first absorption chamber 13, and first absorption chamber 13 is communicated with the second absorption chamber 14 of the same group by the inverted U-shaped pipe 21, and one end of inverted U-shaped pipe 21 is located in the upper part of first absorption chamber 13, and the other end is located in the lower part of second absorption chamber 14.Two second branch pipes 7 and two groups of front processing mechanism 2's second absorption chamber 14 one by one correspond and the first end of second branch pipe 7 extends into the upper part of corresponding second absorption chamber 14.The tail end of two third branch pipes 8 is communicated with air inlet hose 22, and the first end of two fourth branch pipes 9 is communicated with air outlet hose 23, and air induction mechanism 4 includes support base 24, and air induction fan 25 is detachably arranged on support base 24, two air inlet hoses 22 and two groups of air induction mechanism 4's air induction fan 25's air inlet one by one correspond and are connected by air inlet quick connector 26, and two air outlet hoses 23 and two groups of air induction mechanism 4's air induction fan 25's air outlet one by one correspond and are connected by air outlet quick connector 27;

[0019] When the air induction works, the first end of the tail gas discharge main pipe 1 is connected with the tail gas discharge port of the isooctyl chloroformate synthesis reaction device, the tail end of the tail gas conveying main pipe 5 is connected with the gas inlet of the tail gas post-treatment system, one set of the pre-treatment mechanisms 2 is in standby, one set of the air induction mechanisms 4 is in standby as well, and the switching is controlled by the control valves 10 on the corresponding branch pipes. When the air induction works, the control valves 10 on the first branch pipe 6 and the second branch pipe 7 corresponding to one set of the pre-treatment mechanisms 2 are opened, the control valves 10 on the first branch pipe 6 and the second branch pipe 7 corresponding to the other set of the pre-treatment mechanisms 2 are closed, the control valves 10 on the third branch pipe 8 and the fourth branch pipe 9 corresponding to one set of the air induction mechanisms 4 are opened, and the control valves 10 on the third branch pipe 8 and the fourth branch pipe 9 corresponding to the other set of the air induction mechanisms 4 are closed, so as to form the working state of one set in standby. Then, under the pumping of the air induction fan 25, the tail gas can first enter the lower part of the first absorption chamber 13 of the corresponding absorption tank 11 through the tail gas discharge main pipe 1 and the unblocked first branch pipe 6, and flow from bottom to top, so that the phosgene component in the tail gas can be effectively absorbed and removed by the first absorption liquid 15. Then, the tail gas can enter the lower part of the second absorption chamber 14 through the inverted U-shaped pipe 21, and flow from bottom to top again. Thus, the hydrogen chloride component in the tail gas can be effectively absorbed and removed by the second absorption liquid 16. After that, the tail gas can be conveyed to the tail gas conveying main pipe 5 through the unblocked second branch pipe 7, the intermediate pipe 3, the third branch pipe 8, the air induction fan 25 and the fourth branch pipe 9, and finally conveyed to the post-treatment system by the tail gas conveying main pipe 5. In this way, the harmful components in the tail gas can be effectively absorbed and removed step by step before the tail gas enters the air induction fan 25, which can greatly reduce the corrosion and damage of the tail gas to the air induction fan 25, so as to better ensure the service life of the air induction fan 25. In addition, when the first absorption liquid 15 and the second absorption liquid 16 are saturated, the corresponding absorption liquids can be discharged and supplemented through the liquid inlet pipe 18 and the liquid outlet pipe 20 on the corresponding absorption chamber, and when the absorption liquid is replaced, the control valves 10 on the first branch pipe 6 and the second branch pipe 7 corresponding to the pre-treatment mechanism 2 can be closed to stop the operation of the pre-treatment mechanism 2, and the control valves 10 on the first branch pipe 6 and the second branch pipe 7 corresponding to the other pre-treatment mechanism 2 can be opened to make the other pre-treatment mechanism 2 work. When the air induction fan 25 needs to be replaced due to failure, the control valves 10 on the third branch pipe 8 and the fourth branch pipe 9 corresponding to the current air induction fan 25 can be closed to stop the operation of the air induction mechanism 4, and the control valves 10 on the third branch pipe 8 and the fourth branch pipe 9 corresponding to the other air induction mechanism 4 can be opened to make the other air induction mechanism 4 work. After the failed air induction fan 25 stops working, the connection between the air inlet and the air outlet of the air induction fan 25 and the corresponding air inlet hose 22 and air outlet hose 23 can be quickly disconnected through the corresponding air inlet quick connector 26 and air outlet quick connector 27, and the air induction fan 25 can be disassembled and replaced through the detachable connection between the air induction fan 25 and the supporting base 24. In this way, the device as a whole can be used more flexibly and conveniently, and be more practical.The first absorption liquid 15 can adopt conventional organic solvents capable of dissolving phosgene, such as aromatic hydrocarbons, benzene, carbon tetrachloride, chloroform, acetic acid, etc. The second absorption liquid 16 can adopt water or alkaline solution, etc. capable of dissolving or neutralizing hydrogen chloride, so as to cooperate with absorption to remove phosgene and hydrogen chloride in the tail gas. The gas inlet quick connector 26 and the gas outlet quick connector 27 can be adopted by using existing technologies, which are generally composed of a male head and a female head. The male head or the female head can be pre-installed on the gas inlet and outlet of the induced draft fan 25, and the corresponding female head or male head is pre-installed on the corresponding gas inlet or outlet hose, so as to be used in cooperation.

[0020] In the embodiment, the top center of the support base 24 is provided with a positioning blind groove 28, and one side of the bottom of the support base 24 is embedded with a hydraulic cylinder 29. A threaded through hole 30 is formed in the support base 24 on one side of the positioning blind groove 28, and a threaded blind hole 31 is formed in the support base 24 on the other side. The threaded through hole 30 and the threaded blind hole 31 correspond to each other and are in communication with the positioning blind groove 28. The piston rod of the hydraulic cylinder 29 is fixedly connected with a vertical plate 32, the upper part of the vertical plate 32 is fixedly provided with a motor 33, the output shaft of the motor 33 is coaxially fixedly connected with a screw rod 34 toward the support base 24, and the screw rod 34 corresponds to the threaded through hole 30. The induced draft fan 25 is fixedly provided on a mounting plate 35, the mounting plate 35 abuts against the top of the support base 24 and is fixedly provided with a positioning plate 36 at the bottom, the positioning plate 36 is inserted into the positioning blind groove 28 and a limiting threaded hole 37 is formed through the position corresponding to the threaded through hole 30, and the screw rod 34 can be screwed into the threaded through hole 30, the limiting threaded hole 37 and the threaded blind hole 31;

[0021] When the induced draft fan 25 is replaced, the system can be switched to another induced draft fan 25 for air induction work, and the induced draft fan 25 to be replaced is stopped. Then, the air inlet and outlet of the induced draft fan 25 are disconnected from the corresponding air inlet hose 22 and air outlet hose 23 through the air inlet quick connector 26 and the air outlet quick connector 27. Then, the hydraulic cylinder 29 and the motor 33 are operated, the extension of the piston rod of the hydraulic cylinder 29 can drive the vertical plate 32, the motor 33 and the screw rod 34 as a whole to move away from the support base 24, and the motor 33 can drive the screw rod 34 to reverse, and the screw rod 34 is rotated out of the threaded blind hole 31, the limiting threaded hole 37 and the threaded through hole 30 in sequence, so that the screw locking of the positioning plate 36 is released, and the positioning plate 36 is pulled out, and the original induced draft fan 25 is disassembled. Then, a new induced draft fan 25 is taken, the mounting plate 35 thereon is abutted to the support base 24, the positioning plate 36 thereon is aligned and inserted into the positioning blind groove 28, and the hydraulic cylinder 29 and the motor 33 are operated, so that the piston rod of the hydraulic cylinder 29 is retracted and the motor 33 drives the screw rod 34 to rotate forward, and the screw rod 34 is rotated into the threaded through hole 30, the limiting threaded hole 37 and the threaded blind hole 31, so that the positioning plate 36 is screw-locked, and the new induced draft fan 25 is fixed and installed, and the installation is stable and does not affect the subsequent use. Finally, the air inlet and outlet of the induced draft fan 25 are connected to the corresponding air inlet hose 22 and air outlet hose 23 through the air inlet quick connector 26 and the air outlet quick connector 27, and the subsequent switching is waited for. In this way, the induced draft fan 25 can be conveniently disassembled and replaced, the use of the device as a whole is more flexible and convenient, and the device is more practical.

[0022] In the embodiment, the positioning plate 36 is matched with the positioning blind groove 28, so that the positioning plate 36 is smoothly inserted into position.

[0023] In the embodiment, the screw rod 34 is matched with the threaded through hole 30, the limiting threaded hole 37 and the threaded blind hole 31, so that the screw rod 34 is smoothly rotated into position, and the screw locking of the positioning plate 36 is realized.

[0024] In the embodiment, the support base 24 is made of foamed aluminum, which is a material in the prior art and has the characteristics of high damping, shock absorption and energy absorption. The support base 24 made of foamed aluminum can provide good buffering and damping effect when the induced draft fan 25 works, which can reduce the adverse effects of the vibration generated by the induced draft fan 25 on the surrounding environment and improve the stability of the induced draft fan 25 when it works, and the device is more practical.

[0025] The above only describes the preferred embodiments of the present application, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A draft inducing device for off-gas treatment of isooctyl chloroformate, characterized by The exhaust emission main pipe is provided with two first branch pipes in parallel at the tail end, the first end of the intermediate pipe is provided with two second branch pipes in parallel, the tail end of the intermediate pipe is provided with two third branch pipes in parallel, and the first end of the exhaust conveying main pipe is provided with two fourth branch pipes in parallel.

2. The induced draft device for isooctyl chloroformate off-gas treatment according to claim 1, characterized by The support base is provided with a positioning blind groove in the top center, and a hydraulic cylinder is embedded in one side of the bottom.

3. The induced draft device for isooctyl chloroformate off-gas treatment according to claim 2, characterized by The positioning plate is matched with the positioning blind groove.

4. The induced draft device for isooctyl chloroformate off-gas treatment according to claim 2, characterized by The screw rod is matched with the threaded hole, the limiting threaded hole and the threaded blind hole.

5. The induced draft device for isooctyl chloroformate off-gas treatment according to claim 1 or 2, characterized by, The support base is made of foamed aluminum.

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