Reaction rectifying still for preparing cyclohexanol from cyclohexene through indirect hydration method

Abstract

The reaction rectifying still comprises a base, a back plate is arranged in the middle of the rear side of the top face of the base, an upper still body, a plurality of middle still bodies and a lower still body are arranged on the front side of the back plate, one side of the upper portion of the upper still body is communicated with a liquid inlet pipe, and the top end of the upper still body is communicated with an exhaust pipe. One side of the lower part of the lower kettle body is communicated with an air inlet pipe, the bottom end of the lower kettle body is communicated with a liquid discharge pipe, motors are arranged on the left outer side and the right outer side of the lower part of the upper kettle body and the left outer side and the right outer side of the middle kettle body, and output shafts of the motors are fixedly connected with limiting rods in the radial direction; an inverted-T-shaped slot is formed in the upper part of the mounting seat, a power-off holding type electromagnet is arranged in the lower part of the mounting seat, an inverted-T-shaped insertion block is inserted into the slot, a side plate is arranged at the top of the insertion block, and a plurality of filling barrels are arranged on one side, close to the upper kettle body, of the side plate. The whole packing barrel can be quickly replaced through a sectional structure, and the packing barrel is more convenient and practical.

Description

Technical Field

[0001] The utility model belongs to the technical field of distillation, and specifically relates to a reaction distillation kettle for preparing cyclohexanol from cyclohexene by an indirect hydration method. Background Art

[0002] At present, the production methods of cyclohexanol mainly include cyclohexane oxidation, phenol hydrogenation and cyclohexene hydration. Among them, cyclohexene hydration has obvious advantages in terms of system safety and product selectivity, and also has the advantages of low raw material cost, saving hydrogen source, and high carbon atom utilization rate. Cyclohexene hydration is divided into direct hydration and indirect hydration. Indirect hydration is to first react cyclohexene with methanol to generate cyclohexyl methyl ether, and then cyclohexyl methyl ether and water are hydrated to generate cyclohexanol. After the reaction is completed, the product is discharged and then separated from oil and water, distilled, and other processes can be used to obtain cyclohexanol. In the distillation processing of cyclohexanol, a packed distillation tower or distillation kettle is usually used, but its packing structure is mostly directly fixed inside the equipment. After long-term use, it is difficult to disassemble, maintain and replace the packing structure. It is often necessary to fully disassemble the equipment to remove it, which is time-consuming and laborious. It is difficult to ensure that the packing structure is sufficiently stable after taking it out and then reinstalling it, making the overall equipment not convenient and practical, which is not conducive to subsequent distillation operations and needs to be improved. Utility Model Content

[0003] In view of this, the purpose of the utility model is to provide a reaction distillation kettle for preparing cyclohexanol from cyclohexene by indirect hydration method, which can quickly replace the entire packing cylinder through a segmented structure to solve the above problems.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the utility model is: a reaction distillation kettle for preparing cyclohexanol from cyclohexene by indirect hydration method, comprising a base, a back plate is vertically fixedly arranged in the middle of the rear side of the top surface of the base, an upper kettle body, a plurality of middle kettle bodies and a lower kettle body are fixedly arranged on the front side of the back plate from top to bottom in sequence, gaps are left between the upper kettle body and the adjacent middle kettle body, between two adjacent middle kettle bodies, and between the lower kettle body and the adjacent middle kettle body, the bottom of the upper kettle body, the top and bottom of the middle kettle body and the top of the lower kettle body are all open, one side of the upper part of the upper kettle body is connected with a liquid inlet pipe, the top end is connected with an exhaust pipe, one side of the lower part of the lower kettle body is connected with an air inlet pipe, and the bottom end is connected with a liquid discharge pipe, motors are fixedly arranged on the left and right outer sides of the lower part of the upper kettle body and the left and right outer sides of the middle kettle body, the output shaft of the motor is radially fixedly connected to a limiting rod, guide rails are horizontally fixedly arranged on the left and right sides of the top surface of the base along the left and right directions, and an electric slider is slidably arranged on the guide rails, A mounting seat is fixed on the top of the electric slider, an inverted T-shaped slot is provided on the upper part of the mounting seat, and a power-off holding type electromagnet is built in the lower part, an inverted T-shaped plug is plugged into the slot, the plug is magnetic and is magnetically connected to the power-off holding type electromagnet, a side plate is vertically fixed on the top of the plug, a plurality of stuffing cylinders distributed at intervals up and down are fixed on the side of the side plate close to the upper kettle body, the top and bottom parts of the stuffing cylinder are both open and support grid plates are fixed in the top and bottom parts, the stuffing cylinder between the two support grid plates is filled with stuffing, the left and right outer sides of the upper part of the stuffing cylinder are fixedly connected to the limited seat, the upper part of the limited seat is provided with a limited slot, the bottom of the limited slot is arc-shaped and connected to the front side of the limited seat, the stuffing cylinder corresponds to the gap one by one and can be inserted into the corresponding gap, at this time, the top and bottom parts of the stuffing cylinder are abutted against the corresponding bottom of the upper kettle body, the top and bottom parts of the middle kettle body, and the top of the lower kettle body, and the limit rod can be rotated from front to back into the limit slot on the same side.

[0005] Preferably, the liquid inlet pipe, the exhaust pipe, the air intake pipe and the liquid discharge pipe are all provided with control valves.

[0006] Preferably, one end of the liquid inlet pipe extending into the upper kettle body is fixedly connected to a liquid distributor arranged downward.

[0007] Preferably, one end of the air inlet pipe extending into the lower kettle body is fixedly connected to a gas distributor arranged upward.

[0008] Preferably, sealing gaskets are fixedly arranged on the bottom of the upper kettle body, the top and bottom of the middle kettle body, and the top of the lower kettle body.

[0009] Preferably, the plug block is adapted to the slot.

[0010] Preferably, the groove bottom of the limiting groove is adapted to the rotation track of the corresponding limiting rod.

[0011] The beneficial effect of the utility model is that in the initial state, the electric sliders are all at the end of the guide rail away from the back plate, and the limit rod is facing upward. During the distillation process, first run one group of electric sliders to move the packing tube along the corresponding guide rail toward the direction of the back plate until the packing tube is plugged into the corresponding gap. Then, run the motor to drive the limit rod to rotate forward 180 degrees, so that the limit rod can be rotated into the corresponding limit groove. In this way, through the mutual cooperation of the plug-in and magnetic connection between the electric slider, the plug-in block and the mounting seat, the plug-in between the packing tube and the gap, and the plug-in between the limit rod and the corresponding limit groove, a more stable and reliable fixed installation of the packing tube can be achieved without affecting the subsequent distillation operation. Next, the cyclohexanol feed liquid to be distilled is input through the liquid inlet pipe, so that the feed liquid flows from top to bottom, and steam is input through the air inlet pipe, so that the steam flows from bottom to top, so that the gas and liquid phases are relatively countercurrently passed through each layer of the packing tube, and the gas and liquid phases are closely contacted at the packing in the packing tube for mass transfer, thereby realizing the distillation treatment of the cyclohexanol, and the treated gas phase is discharged through the exhaust pipe, and the treated liquid phase is discharged through the liquid discharge pipe;

[0012] After using for a period of time, when the packing needs to be replaced, the motor can be operated in the shutdown state to drive the limit rod to rotate 180 degrees in the opposite direction, so that the limit rod is facing upward again, and the clamping limit of the packing tube can be released. Then, the corresponding electric slider is operated to move toward the side away from the back plate, and the used packing tube can be withdrawn from the corresponding gap and removed from the distillation kettle. Then, another set of electric sliders can be operated, and another set of packing tubes can be installed in place according to the above steps, and the distillation operation can be continued. At the same time, the power-off holding type electromagnet corresponding to the used packing tube can be connected to make it demagnetized by power-on, and the magnetic connection of the corresponding plug block can be released. Then the plug block can be moved out in the front and back direction, and the packing tube group can be removed from the mounting seat, and then another set of new packing tubes can be taken, and the plug block on it can be plugged into the mounting seat, and then the circuit of the power-off holding type electromagnet can be disconnected to restore the magnetic attraction of the power-off holding type electromagnet, and the plug block can be fixed by magnetic attraction, so that the new packing tube can be fixed and wait for subsequent switching and use. In this way, the overall convenient disassembly and assembly of a single group of packing cylinders and the quick switching of two groups of packing cylinders can be realized without disassembling the entire distillation kettle, which is more conducive to the distillation operation and makes the overall use of the equipment more flexible, convenient and practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a main structural schematic diagram of the utility model;

[0014] Figure 2 It is a schematic diagram of the main structure of the upper kettle body, the middle kettle body and the lower kettle body of the utility model;

[0015] Figure 3It is a left-side structural schematic diagram of the upper kettle body, the middle kettle body and the lower kettle body of the utility model;

[0016] Figure 4 This is a schematic diagram of the main structure of the mounting seat of the utility model;

[0017] Figure 5 This is a schematic diagram of the main structure of the side plate and the upper filling tube of the utility model;

[0018] Figure 6 It is a right side structural schematic diagram of the packing cylinder of the utility model;

[0019] Figure 7 It is a right side structural schematic diagram of the utility model when the filling cylinder is connected to the middle kettle body.

[0020] Numbers in the figure: 1 is a base, 2 is a back plate, 3 is an upper kettle body, 4 is a middle kettle body, 5 is a lower kettle body, 6 is a liquid inlet pipe, 7 is an exhaust pipe, 8 is an air inlet pipe, 9 is a liquid discharge pipe, 10 is a motor, 11 is a limit rod, 12 is a guide rail, 13 is an electric slider, 14 is a mounting seat, 15 is a slot, 16 is a power-off holding type electromagnet, 17 is an insert, 18 is a side plate, 19 is a stuffing tube, 20 is a supporting grid plate, 21 is a stuffing, 22 is a limit seat, 23 is a limit groove, 24 is a control valve, 25 is a liquid distributor, 26 is a gas distributor, and 27 is a sealing gasket. DETAILED DESCRIPTION

[0021] The utility model is further described in detail below with reference to the accompanying drawings and specific implementation methods:

[0022] like Figures 1 to 7As shown, a reaction distillation kettle for preparing cyclohexanol from cyclohexene by indirect hydration method comprises a base 1, a back plate 2 is vertically fixed in the middle of the rear side of the top surface of the base 1, an upper kettle body 3, a plurality of middle kettle bodies 4 and a lower kettle body 5 are fixed in sequence from top to bottom on the front side of the back plate 2, gaps are left between the upper kettle body 3 and the adjacent middle kettle body 4, between two adjacent middle kettle bodies 4, and between the lower kettle body 5 and the adjacent middle kettle body 4, and the bottom of the upper kettle body 3, the top and bottom of the middle kettle body 4 and the top of the lower kettle body 5 are all open. One side of the upper part of the upper kettle body 3 is connected to a liquid inlet pipe 6, and the top end is connected to an exhaust pipe 7, and one side of the lower part of the lower kettle body 5 is connected to an air inlet pipe 8, and the bottom end is connected to a liquid discharge pipe 9. A motor 10 is fixed on the left and right outer sides of the lower part of the upper kettle body 3 and the left and right outer sides of the middle kettle body 4, and the output shaft of the motor 10 is radially fixedly connected to a limit rod 11. On both sides of the top surface of the base 1, guide rails 12 are fixed horizontally in the left and right directions, and an electric slider 13 is slidably provided on the guide rails 12. A mounting seat 14 is fixed on the top of the electric slider 13. An inverted T-shaped slot 15 is provided on the upper part of the mounting seat 14, and a power-off holding type electromagnet 16 is built in the lower part. An inverted T-shaped plug 17 is plugged into the slot 15. The plug 17 is magnetic and is magnetically connected to the power-off holding type electromagnet 16. A side plate 18 is fixed vertically on the top of the plug 17, and a plurality of filler cylinders 19 are fixed on the side of the side plate 18 close to the upper kettle body 3 and are distributed at intervals up and down. The top and bottom of the stuffing tube 19 are open and support grid plates 20 are fixed inside the top and bottom. The stuffing tube 19 between the two support grid plates 20 is filled with stuffing 21. The left and right outer sides of the upper part of the stuffing tube 19 are fixedly connected to the limit seat 22. The upper part of the limit seat 22 is provided with a limit groove 23. The bottom of the limit groove 23 is arc-shaped and connected to the front side of the limit seat 22. The stuffing tube 19 corresponds to the gap one by one and can be inserted into the corresponding gap. At this time, the top and bottom of the stuffing tube 19 abut against the corresponding bottom of the upper kettle body 3, the top and bottom of the middle kettle body 4, and the top of the lower kettle body 5. The limit rod 11 can be rotated from front to back into the limit groove 23 on the same side;

[0023] In the initial state, the electric sliders 13 are all at the end of the guide rail 12 away from the back plate 2, and the limit rod 11 is facing upward. During the distillation process, first run one group of electric sliders 13 to move the filling tube 19 along the corresponding guide rail 12 toward the direction of the back plate 2 until the filling tube 19 is plugged into the corresponding gap. Then, run the motor 10 to drive the limit rod 11 to rotate forward 180 degrees, so that the limit rod 11 can be rotated into the corresponding limit groove 23. In this way, through the mutual cooperation of the plug-in and magnetic connection between the electric slider 13, the plug-in block 17 and the mounting seat 14, the plug-in between the filling tube 19 and the gap, and the plug-in between the limit rod 11 and the corresponding limit groove 23, a more stable and reliable fixed installation of the filling tube 19 can be achieved without affecting the subsequent distillation operation. Next, the cyclohexanol feed liquid to be distilled is input through the liquid inlet pipe 6 so that the feed liquid flows from top to bottom, and steam is input through the air inlet pipe 8 so that the steam flows from bottom to top, so that the gas-liquid two-phases are relatively countercurrently passed through each layer of the packing tube 19, and the gas-liquid two-phases are closely contacted at the packing in the packing tube 19 for mass transfer, thereby realizing the distillation treatment of the cyclohexanol, and the treated gas phase is discharged through the exhaust pipe 7, and the treated liquid phase is discharged through the liquid discharge pipe 9;

[0024] After using for a period of time, when the packing needs to be replaced, the motor 10 can be operated in the shutdown state to drive the limit rod 11 to rotate 180 degrees in the opposite direction, so that the limit rod 11 is facing upward again, and the clamping limit of the packing tube 19 can be released. Then, the corresponding electric slider 13 is operated to move toward the side away from the back plate 2, and the used packing tube 19 can be withdrawn from the corresponding gap and removed from the distillation kettle. Then, another set of electric sliders 13 can be operated, and another set of packing tubes 19 can be installed in place according to the above steps, and the distillation operation can be continued. At the same time, the power-off holding type electromagnet 16 corresponding to the used packing tube 19 can be connected to make it demagnetized by power-on, and the magnetic connection to the corresponding plug block 17 can be released, and then the plug block 17 can be moved out in the front-to-back direction, so that the group of packing tubes 19 can be removed from the mounting seat 14, and then another group of new packing tubes 19 can be taken, and the plug block 17 on it is first plugged into the mounting seat 14, and then the circuit of the power-off holding type electromagnet 16 is disconnected, so that the power-off holding type electromagnet 16 can restore the magnetic attraction, and the plug block 17 can be fixed by magnetic attraction, and the new packing tube 19 can be fixed, and it can be waited for subsequent switching and use. In this way, the overall convenient disassembly and assembly of a single group of packing tubes 19 and the quick switching of two groups of packing tubes 19 can be realized, without disassembling the entire distillation kettle, which is more conducive to the distillation operation, making the overall use of the equipment more flexible, convenient and practical. The motor 10 can use an existing conventional stepping motor with a brake function to cooperate with the rotation of the corresponding angle and the position locking after the rotation into place. The power-off holding type electromagnet 16 is an existing technology, which is suitable for environments where long-term suction is required. Compared with ordinary electromagnets that generate magnetism when powered on and demagnetize when powered off, it is just the opposite. It has the characteristics of demagnetization when powered on and magnetism when powered off, which can reduce the use of electricity and is more practical. The plug block can be made of conventional magnetic metal materials such as iron.

[0025] In this embodiment, control valves 24 are provided on the liquid inlet pipe 6, the exhaust pipe 7, the air inlet pipe 8 and the liquid discharge pipe 9 to control the on-off of the corresponding pipelines.

[0026] In this embodiment, one end of the liquid inlet pipe 6 extending into the upper kettle body 3 is fixedly connected to a downwardly disposed liquid distributor 25 for distributing the liquid. The liquid distributor 25 can be made of existing technology.

[0027] In this embodiment, one end of the air inlet pipe 8 extending into the lower kettle body 5 is fixedly connected to an upwardly disposed gas distributor 26 for distributing steam. The liquid distributor 25 can be made of existing technology.

[0028] In this embodiment, sealing gaskets 27 are fixedly provided on the bottom of the upper kettle body 3, the top and bottom of the middle kettle body 4, and the top of the lower kettle body 5 to ensure the sealing of the connection so that the distillation operation can proceed smoothly.

[0029] In this embodiment, the plug-in block 17 is matched with the slot 15 to ensure that the plug-in block 17 is smoothly plugged into place.

[0030] In this embodiment, the groove bottom of the limiting groove 23 is matched with the rotation track of the corresponding limiting rod 11 to ensure that the limiting rod 11 is smoothly rotated and inserted into place.

[0031] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A reactive distillation kettle for preparing cyclohexanol from cyclohexene by indirect hydration method, comprising a base, characterized in that: A back plate is vertically fixed to the middle part of the rear side of the top surface of the base, and an upper kettle body, a plurality of middle kettle bodies and a lower kettle body are fixed on the front side of the back plate in sequence from top to bottom, and gaps are left between the upper kettle body and the adjacent middle kettle body, between two adjacent middle kettle bodies, and between the lower kettle body and the adjacent middle kettle body. The bottom of the upper kettle body, the top and bottom of the middle kettle body and the top of the lower kettle body are all open, and one side of the upper part of the upper kettle body is connected to a liquid inlet pipe, and the top end is connected to an exhaust pipe, and one side of the lower part of the lower kettle body is connected to an air inlet pipe, and the bottom end is connected to a liquid discharge pipe. Motors are fixed on the left and right outer sides of the lower part of the upper kettle body and the left and right outer sides of the middle kettle body, and the output shaft of the motor is radially fixedly connected to a limiting rod. Guide rails are horizontally fixedly provided on the left and right sides of the top surface of the base along the left and right directions, and an electric slider is slidably provided on the guide rails. A mounting seat is fixed on the top of the electric slider, and the upper part of the mounting seat An inverted T-shaped slot is provided, and a power-off holding electromagnet is built in the lower part, an inverted T-shaped plug-in block is plugged into the slot, the plug-in block is magnetic and is magnetically connected to the power-off holding electromagnet, a side plate is vertically fixed to the top of the plug-in block, and a plurality of stuffing tubes distributed at intervals up and down are fixed on the side of the side plate close to the upper kettle body, the top and bottom parts of the stuffing tube are open and support grid plates are fixed in the top and bottom parts, and the stuffing tube between the two support grid plates is filled with stuffing, and the left and right outer sides of the upper part of the stuffing tube are fixedly connected to the limited seat, and the upper part of the limited seat is provided with a limited slot, the bottom of the limited slot is arc-shaped and connected to the front side of the limited seat, the stuffing tube corresponds to the gap one by one and can be inserted into the corresponding gap, at this time, the top and bottom parts of the stuffing tube abut against the corresponding bottom part of the upper kettle body, the top and bottom parts of the middle kettle body, and the top of the lower kettle body, and the limit rod can be rotated from front to back into the limit slot on the same side.

2. The reactive distillation kettle for preparing cyclohexanol from cyclohexene by indirect hydration method according to claim 1, characterized in that: The liquid inlet pipe, the exhaust pipe, the air inlet pipe and the liquid discharge pipe are all provided with control valves.

3. The reactive distillation kettle for preparing cyclohexanol from cyclohexene by indirect hydration method according to claim 1, characterized in that: One end of the liquid inlet pipe extending into the upper kettle body is fixedly connected with a liquid distributor arranged downward.

4. The reactive distillation reactor for preparing cyclohexanol from cyclohexene by indirect hydration method according to claim 1, characterized in that: One end of the air inlet pipe extending into the lower kettle body is fixedly connected with a gas distributor arranged upward.

5. The reactive distillation reactor for preparing cyclohexanol from cyclohexene by indirect hydration method according to claim 1, characterized in that: Sealing pads are fixedly arranged on the bottom of the upper kettle body, the top and bottom of the middle kettle body, and the top of the lower kettle body.

6. The reactive distillation reactor for preparing cyclohexanol from cyclohexene by indirect hydration method according to claim 1, characterized in that: The inserting block is matched with the slot.

7. The reactive distillation reactor for preparing cyclohexanol from cyclohexene by indirect hydration method according to claim 1, characterized in that: The groove bottom of the limiting groove is adapted to the rotation track of the corresponding limiting rod.

Images