Energy-saving distillation column for pharmaceutical intermediates

Abstract

This invention relates to an energy-saving distillation column for pharmaceutical intermediates. The energy-saving distillation column includes a heating tank, a receiving tank, and a storage tank. An electric heating ring is installed on the lower part of the outer wall of the heating tank. A storage tower is installed inside the heating tank, with a rotating shaft at its center and N distributing impellers mounted on the shaft. A steam-driven impeller is installed at the top of the rotating shaft, and multiple steam nozzles are installed at the bottom of the receiving tank. A coil mounting ring is provided at the bottom of the storage tank, and at least one set of metal coils is provided in the coil mounting ring. One end of the metal coil is connected to the storage tank, and the other end of the metal coil is connected to a mixed liquid output connector on the side wall of the coil mounting ring. A liquid injection pipe is screwed to the side wall of the heating tank, and the mixed liquid output connector and the liquid injection pipe are connected through a delivery pipe. Beneficial effects: The steam kinetic energy is used to rotate the distributing impellers, spraying the mixed liquid in the storage tower onto the inner wall of the heating tank. The steam thermal energy is used to preheat the mixed liquid, increasing the evaporation rate of the mixed liquid in the heating tank.

Description

Technical Field

[0001] This invention relates to the field of distillation columns, and more particularly to an energy-saving distillation column for pharmaceutical intermediates. Background Technology

[0002] A distillation column is a separation device that uses the principle that different liquids have different boiling points under different temperature conditions to separate liquids and thus achieve purification.

[0003] Existing distillation columns heat the mixture directly from the outside or bottom of the column, causing the low-boiling-point liquid components in the mixture to vaporize into steam and rise for separation. Moreover, the mixtures are packed together, resulting in slow and uneven heating, which leads to poor vaporization of the low-boiling-point liquid components. The vaporized steam requires a large amount of refrigerant to condense back into liquid, resulting in high refrigerant demand and high refrigerant production costs. Summary of the Invention

[0004] The purpose of this invention is to overcome the above-mentioned problems in the prior art and provide an energy-saving distillation tower for pharmaceutical intermediates.

[0005] To achieve the above-mentioned technical objectives and effects, the present invention is implemented through the following technical solution:

[0006] An energy-saving distillation column for pharmaceutical intermediates includes, from bottom to top, a heating tank for heating a mixture, a receiving tank for collecting condensate, and a storage tank for containing the room-temperature mixture. An electric heating ring for heating the mixture in the heating tank is installed on the lower part of the outer wall of the heating tank. A tower-shaped storage tank is installed inside the heating tank, with a rotating shaft at its center. N distribution impellers are installed on the rotating shaft to spray the mixture from the storage tank onto the inner wall of the heating tank. The top of the rotating shaft extends upwards into the receiving tank, and a vapor-driven device is installed at the top of the rotating shaft. The impeller is driven, and the bottom of the receiving tank is equipped with multiple steam nozzles arranged in a circular array. The nozzles of the steam nozzles are inclined upwards towards the steam-driven impeller. The bottom of the storage tank is provided with a downward-extending coil mounting ring. At least one set of spiral metal coils is provided in the coil mounting ring. One end of the metal coil is connected to the storage tank, and the other end is connected to the mixed liquid output connector on the side wall of the coil mounting ring. The side wall of the heating tank is screwed with an injection pipe for injecting mixed liquid into the storage tank. The mixed liquid output connector and the injection pipe are connected through a delivery pipe.

[0007] Among them, the liquid storage tower includes an annular support ring, N annular liquid storage trays, and M long bolts. The support ring is provided with M screw holes arranged in an annular array. The bottom end of each liquid storage tray has M support rods arranged in an annular array. One end of each support rod far from the liquid storage tray is fixedly connected with a support pipe. The support pipe is perpendicular to the support rod. The support pipes around the support ring and the N liquid storage trays are stacked in sequence from bottom to top. The tail of the long bolt sequentially passes through the coaxial support pipes from top to bottom and is screwed with the screw hole; the outer diameters of the N liquid storage trays gradually decrease from bottom to top; the outlet of the liquid injection pipe extends above the liquid storage tray at the top of the liquid storage tower.

[0008] Among them, a spill prevention ring protruding upward is provided in the middle of the liquid storage tray, and an overflow ring extending upward is provided on the outer periphery of the liquid storage tray. The top end of the overflow ring on the same liquid storage tray is lower than the top end of the spill prevention ring.

[0009] Among them, a first bearing mounting seat is installed at the bottom end of the liquid storage tray at the bottom of the liquid storage tower. A first oil-free bearing is installed in the first bearing mounting seat. The bottom of the rotating shaft is installed in the first oil-free bearing; a waste discharge pipe is provided in the middle of the bottom of the heating barrel. The top end of the waste discharge pipe abuts against the bottom end of the first bearing mounting seat. A plurality of liquid discharge holes are provided on the waste discharge pipe located inside the heating barrel.

[0010] Among them, the liquid distribution impeller includes an annular impeller mounting disc. A plurality of liquid distribution blades arranged in an annular array are fixedly connected to the outside of the impeller mounting disc. A liquid taking part for extending into the liquid storage tray is provided at the bottom of the liquid distribution blade. A plurality of mutually parallel flow guiding grooves are provided on the front surface of the liquid distribution blade. The flow guiding groove is in the shape of "丿". The inlet end of the flow guiding groove is located at the liquid taking part, and the outlet end of the flow guiding groove is located on the centrifugal side of the liquid distribution blade; a fan-shaped reinforcing rib plate is provided between the top of the impeller mounting disc and the liquid distribution blade.

[0011] Among them, a coil pipe support frame in the shape of "*" is installed in the mounting ring, and the metal coil pipe is installed on the coil pipe support frame.

[0012] Among them, a condensate drain pipe is provided on one side of the bottom of the liquid receiving barrel.

[0013] Among them, a high-temperature resistant sealing ring is sandwiched between the top end of the heating barrel and the bottom end of the liquid receiving barrel.

[0014] Among them, a heat preservation cover for reducing heat dissipation in the heating barrel is installed outside the heating barrel, and the electric heating ring is covered in the heat preservation cover.

[0015] Among them, a flow valve for adjusting the flow rate of the mixed liquid in the infusion pipe is installed on the infusion pipe.

[0016] The beneficial effects of this invention are: 1. The electric heating ring heats the mixture in the heating tank, causing the low-boiling-point liquid in the mixture to vaporize into steam and rise to the upper part of the heating tank. The steam is sprayed from the steam nozzle onto the steam-driven impeller, driving the steam-driven impeller to rotate. Through the rotating shaft, the liquid distribution impeller rotates, spraying the mixture in the storage pan onto the inner wall of the heating tank, forming a thin film of the mixture on the inner wall of the heating tank, increasing the heating speed of the mixture and improving the uniformity of the heating; 2. The steam sprayed from the steam nozzle rises into the coil mounting ring, and the room-temperature mixture in the storage tank flows into the metal coil. The steam and the mixture exchange heat through the metal coil, causing the steam to cool down and condense into liquid, falling into the receiving tank, thus preheating the room-temperature mixture and increasing the temperature of the mixture when it enters the heating tank. Attached Figure Description

[0017] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0018] Figure 1 This is a schematic diagram of the energy-saving distillation tower in this invention;

[0019] Figure 2 This is a partial cross-sectional structural diagram of the heating barrel, electric heating ring, heat insulation cover, and high-temperature resistant sealing ring in the assembled state of the present invention;

[0020] Figure 3 This is a first-view structural schematic diagram of the liquid storage tower and rotating shaft assembly in this invention;

[0021] Figure 4 This is a second-view structural schematic diagram of the liquid storage tower and rotating shaft assembly in this invention;

[0022] Figure 5 This is a schematic diagram of the liquid storage tower in this invention;

[0023] Figure 6 This is a schematic diagram of the liquid storage tray in this invention;

[0024] Figure 7 This is a schematic diagram of the liquid distribution impeller in this invention;

[0025] Figure 8 This is a schematic diagram of the assembly of the liquid storage tank, coil support frame and metal coil in this invention;

[0026] Figure 9 This is a schematic diagram of the assembly of the liquid receiving tank, rotating shaft, and steam-driven impeller in this invention;

[0027] Figure 10This is a schematic diagram of the assembly of the liquid receiving tank and the rotating shaft in this invention;

[0028] Explanation of the numbers in the diagram: Heating tank 1, Support leg 101, Overflow pipe 102, Waste drain pipe 103, Drain hole 104, Receiving tank 2, Bearing mounting ring 201, Second oilless bearing 202, Condensate drain pipe 203, Safety valve 204, Storage tank 3, Coil mounting ring 301, Mixed liquid output connector 302, Storage tower 4, Support ring 401, Storage pan 402, Long bolt 403, Support rod 404, Support pipe 405, Anti-overflow ring 406, Overflow ring 407, Rotating shaft 5, First Bearing mounting base 501, first oilless bearing 502, high-temperature resistant sealing ring 503, liquid distribution impeller 6, impeller mounting plate 601, liquid distribution blade 602, liquid intake part 603, guide groove 604, reinforcing rib 605, steam driven impeller 7, guide shroud 701, steam nozzle 8, coil support frame 9, metal coil 10, liquid injection pipe 11, liquid delivery pipe 12, flow valve 1201, electric heating ring 13, heat preservation cover 14, high-temperature resistant sealing ring 15, barrel cover 16, liquid filling pipe interface 1601. Detailed Implementation

[0029] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0030] like Figures 1 to 10 As shown, an energy-saving distillation column for pharmaceutical intermediates includes, from bottom to top, a heating tank 1 for heating the mixture, a receiving tank 2 for collecting condensate, and a storage tank 3 for containing the mixture at room temperature.

[0031] A tower-shaped liquid storage tower 4 is installed in the heating tank 1. Specifically, the liquid storage tower 4 includes an enlarged circular annular support ring 401, five circular annular liquid storage trays 402, and six long bolts 403. The support ring 401 has six screw holes arranged in a circular array. At the bottom of each liquid storage tray 402, there are six support rods 404 arranged in a circular array. A support tube 405 is fixed to the end of each support rod 404 away from the liquid storage tray 402. The support tube 405 is perpendicular to the support rod 404. The support tubes 405 around the support ring 401 and the five liquid storage trays 402 are stacked sequentially from bottom to top. The tail of the long bolt 403 passes through the coaxial support tube 405 sequentially from top to bottom and is screwed into the screw hole.

[0032] The outer diameter of the five liquid storage trays 402 decreases progressively from bottom to top. An upward-protruding anti-overflow ring 406 is provided in the middle of the liquid storage tray 402, and an upward-extending overflow ring 407 is provided around the outer periphery of the liquid storage tray 402. The top of the overflow ring 407 on the same liquid storage tray 402 is lower than the top of the anti-overflow ring 406, so that excess mixed liquid on the liquid storage tray 402 overflows from the overflow ring 407 and falls into the liquid storage tray 402 below or into the heating tank.

[0033] A rotating shaft 5 is installed at the center of the liquid storage tower 4. Specifically, a first bearing mounting seat 501 is installed at the bottom end of the liquid storage tray located at the bottom of the liquid storage tower 4. A first oil-free bearing 502 is installed in the first bearing mounting seat 501, and the bottom of the rotating shaft 5 is installed in the first oil-free bearing 502.

[0034] Five liquid distribution impellers 6 for spraying the mixed liquid in the liquid storage tower 4 onto the inner wall of the heating barrel 1 are installed on the rotating shaft 5. Specifically, the liquid distribution impeller 6 includes an annular impeller mounting disc 601. A plurality of liquid distribution blades 602 arranged in an annular array are fixedly connected to the outer side of the impeller mounting disc 601. A liquid taking part 603 for extending into the liquid storage tray 402 is provided at the bottom of the liquid distribution blade 602. A plurality of mutually parallel diversion channels 604 are provided on the front surface of the liquid distribution blade 602. The diversion channels 604 are in the shape of "丿". The inlet end of the diversion channel 604 is located at the liquid taking part 603, and the outlet end of the diversion channel 604 is located on the centrifugal side of the liquid distribution blade 602. When the liquid distribution impeller 6 rotates, the liquid taking part 603 shovels up the mixed liquid in the liquid storage tray 402, and the mixed liquid moves centrifugally along the diversion channels 604 and is sprayed onto the inner wall of the heating barrel 1.

[0035] A fan-shaped reinforcing rib plate 605 is provided between the top of the impeller mounting disc 601 and the liquid distribution blade 602 to improve the overall strength of the liquid distribution impeller 6.

[0036] The top of the rotating shaft 5 extends upward into the liquid receiving barrel 2. A bearing mounting ring 201 protruding upward is provided in the middle of the liquid receiving barrel 2. A high-temperature resistant sealing ring 503 sandwiched between the rotating shaft 5 and the bearing mounting ring 201 is sleeved on the rotating shaft 5. A second oil-free bearing 202 is installed at the top end of the bearing mounting ring 201. A steam-driven impeller 7 is installed at the top of the rotating shaft 5. A plurality of steam nozzles 8 arranged in an annular array are installed at the bottom of the liquid receiving barrel 2. The spraying ports of the steam nozzles 8 are inclined upward from bottom to top towards the steam-driven impeller 7 to drive the steam-driven impeller 7 to rotate by the kinetic energy of the steam.

[0037] An umbrella-shaped diversion cover 701 is fixedly connected to the top end of the steam-driven impeller 7. The diversion cover 701 prevents the condensate from directly falling onto the rotating shaft 5 and flowing down along the rotating shaft 5.

[0038] A coil mounting ring 301 extending downward is provided at the bottom of the liquid storage barrel 3. A coil support frame 9 in the shape of "*" is installed in the mounting ring. At least one set of spiral metal coils 10 is provided in the coil mounting ring 301. The metal coils 10 are installed on the coil support frame 9; one end of the metal coils 10 is communicated with the liquid storage barrel 3, and the other end of the metal coils 10 is communicated with a mixed liquid output joint 302 on the side wall of the coil mounting ring 301. A liquid injection pipe 11 for injecting the mixed liquid into the liquid storage tray 402 is screwed on the side wall of the heating barrel 1. The mixed liquid output joint 302 and the liquid injection pipe 11 are communicated through a liquid delivery pipe 12.

[0039] The outlet of the injection pipe 11 extends directly above the storage pan 402 located at the top of the storage tower 4, so that the mixture in the injection pipe 11 is transported to the storage pan 402 located at the top of the storage tower 4, and then the mixture overflows from top to bottom to the bottom of the heating tank.

[0040] The bottom of the heating tank 1 is equipped with 6 support legs 101 arranged in a circular array to support the heating tank 1.

[0041] An electric heating ring 13 for heating the mixture in the heating tank 1 is installed on the lower part of the outer wall of the heating tank 1. The electric heating ring is composed of a spiral electric heating tube.

[0042] The heating barrel 1 is equipped with an insulation cover 14 to reduce heat loss in the heating barrel 1, and the electric heating ring 13 is covered in the insulation cover 14.

[0043] The bottom of the heating tank 1 is also provided with an overflow pipe 102. The top of the overflow pipe 102 is lower than the top of the liquid storage pan 402 located at the bottom of the liquid storage tower 4, and the top of the overflow pipe 102 is higher than the bottom of the liquid storage pan 402 located at the bottom of the liquid storage tower 4.

[0044] A waste discharge pipe 103 is provided at the bottom center of the heating tank 1. The top end of the waste discharge pipe 103 abuts against the bottom end of the first bearing mounting seat 501. Multiple drain holes 104 are provided on the waste discharge pipe 103 located inside the heating tank 1.

[0045] A high-temperature resistant sealing ring 15 is sandwiched between the top of the heating tank 1 and the bottom of the liquid receiving tank 2, which serves to seal the heating tank 1 and the liquid receiving tank 2.

[0046] A condensate drain pipe 203 is provided on one side of the bottom of the liquid receiving tank 2, and the condensate in the liquid receiving tank 2 is discharged through the condensate drain pipe 203.

[0047] A safety valve 204 is installed on one side of the liquid receiving tank 2 to prevent safety accidents caused by excessive air pressure in the liquid receiving tank.

[0048] The top of the storage tank 3 is equipped with a tank cover 16, and the center of the tank cover 16 is provided with a liquid filling pipe interface 1601, which facilitates connection with the storage of ambient temperature mixed liquid or upstream mixed liquid production equipment through a pipeline.

[0049] A flow valve 1201 is installed on the infusion tube 12 to adjust the flow rate of the mixed liquid in the infusion tube 12, so as to facilitate the adjustment of the flow rate of the mixed liquid injected into the heating tank by the infusion tube 12 according to the evaporation status in the heating tank.

[0050] The bottom of the receiving tank 2 is connected to the top of the heating tank 1 and the top of the insulation cover 14 by bolts. The top of the receiving tank 2 is connected to the bottom of the coil mounting ring 301 by bolts and nuts that engage. The tank cover is directly screwed to the top of the storage tank.

[0051] The electric heating ring heats the mixture in the heating tank, causing the low-boiling-point liquid in the mixture to vaporize into steam and rise to the top of the heating tank. The steam is injected from the steam nozzle onto the steam-driven impeller, which drives the impeller to rotate. Through the rotating shaft, the liquid distribution impeller rotates, spraying the mixture in the storage pan onto the inner wall of the heating tank. This forms a thin film of the mixture on the inner wall of the heating tank, increasing the heating speed and uniformity of the mixture.

[0052] The steam ejected from the steam nozzle rises into the coil mounting ring, and the room temperature mixture in the storage tank flows into the metal coil. The steam and the mixture exchange heat through the metal coil, causing the steam to cool down and condense into liquid, which falls into the receiving tank. This preheats the room temperature mixture and increases its temperature when it enters the heating tank.

[0053] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. An energy-saving distillation column for pharmaceutical intermediates, characterized in that: The energy-saving distillation column includes, from bottom to top, a heating barrel for heating the mixed liquid, a liquid receiving barrel for collecting the condensate, and a liquid storage barrel for containing the normal-temperature mixed liquid. A heating ring is installed at the lower part of the outer side wall of the heating barrel to heat the mixed liquid in the heating barrel. A tower-shaped liquid storage tower is installed in the heating barrel. A rotating shaft is installed at the center of the liquid storage tower, and N liquid distribution impellers for spraying the mixed liquid in the liquid storage tower onto the inner wall of the heating barrel are installed on the rotating shaft. The top of the rotating shaft extends upward into the liquid receiving barrel from bottom to top, and a steam-driven impeller is installed at the top of the rotating shaft. A plurality of steam nozzles arranged in an annular array are installed at the bottom of the liquid receiving barrel, and the spraying ports of the steam nozzles are inclined upward toward the steam-driven impeller. A coil installation ring extending downward is provided at the bottom of the liquid storage barrel, and at least one set of spiral metal coils is provided in the coil installation ring. One end of the metal coil is communicated with the liquid storage barrel, and the other end of the metal coil is communicated with a mixed liquid output joint on the side wall of the coil installation ring. A liquid injection pipe for injecting the mixed liquid into the liquid storage tray is screwed on the side wall of the heating barrel, and the mixed liquid output joint and the liquid injection pipe are communicated through an infusion pipe. The liquid distribution impeller includes an annular impeller installation disc. A plurality of liquid distribution blades arranged in an annular array are fixedly connected to the outside of the impeller installation disc. A liquid taking part for extending into the liquid storage tray is provided at the bottom of the liquid distribution blade. A plurality of parallel diversion channels are provided on the front surface of the liquid distribution blade. The diversion channels are in the shape of "丿", the inlet end of the diversion channel is located at the liquid taking part, and the outlet end of the diversion channel is located on the centrifugal side of the liquid distribution blade. A fan-shaped reinforcing rib plate is provided between the top of the impeller installation disc and the liquid distribution blade.

2. The energy-saving distillation column according to claim 1, characterized in that: The liquid storage tower includes an annular support ring, N annular liquid storage trays, and M long bolts. M screw holes arranged in an annular array are provided on the support ring. Each liquid storage tray has M support rods arranged in an annular array at the bottom end. A support pipe is fixedly connected to one end of each support rod away from the liquid storage tray. The support pipe and the support rod are perpendicular to each other. The support pipes around the support ring and the N liquid storage trays are stacked from bottom to top in sequence. The tail of the long bolt passes through the coaxial support pipes from top to bottom and is screwed with the screw hole. The outer diameters of the N liquid storage trays gradually decrease from bottom to top. The outlet of the liquid injection pipe extends above the liquid storage tray at the top of the liquid storage tower.

3. The energy-saving distillation column according to claim 2, characterized in that: An anti-overflow ring protruding upward is provided in the middle of the liquid storage tray. An overflow ring extending upward is provided on the outer periphery of the liquid storage tray. The top end of the overflow ring on the same liquid storage tray is lower than the top end of the anti-overflow ring.

4. The energy-saving distillation column according to claim 2, characterized in that: A first bearing installation seat is installed at the bottom end of the liquid storage tray at the bottom of the liquid storage tower. A first oil-free bearing is installed in the first bearing installation seat. The bottom of the rotating shaft is installed in the first oil-free bearing. A waste discharge pipe is provided in the middle of the bottom of the heating barrel. The top end of the waste discharge pipe abuts against the bottom end of the first bearing installation seat. A plurality of liquid discharge holes are provided on the waste discharge pipe inside the heating barrel.

5. The energy-saving distillation column according to claim 1, characterized in that: The mounting ring is equipped with " A coil support frame in the shape of an "I" is used, on which the metal coil is mounted.

6. The energy-saving distillation column according to claim 1, characterized in that: A condensate drain pipe is provided on one side of the bottom of the liquid receiving barrel.

7. The energy-saving distillation column according to claim 1, characterized in that: A high-temperature resistant sealing ring is sandwiched between the top of the heating tank and the bottom of the liquid receiving tank.

8. The energy-saving distillation column according to claim 1, characterized in that: The heating barrel is equipped with an insulation cover to reduce heat loss from the heating barrel, and the electric heating ring is covered in the insulation cover.

9. The energy-saving distillation column according to claim 1, characterized in that: The infusion tube is equipped with a flow valve for adjusting the flow rate of the mixed liquid in the infusion tube.

Images