A kind of spare vacuum desolventizing equipment for chemical intermediate system

Abstract

The invention relates to the technical field of chemical equipment, and specifically discloses a chemical intermediate system standby decompression desolventizing equipment, including an evaporation unit and a solvent liquefaction recovery unit, wherein the evaporation unit includes a closed outer shell, a concentric ring heating container is rotatably arranged on the upper end of the inner cavity of the closed outer shell, the concentric ring heating container includes a plurality of concentrically arranged evaporation ring plates, one end of the plurality of evaporation ring plates is commonly connected to a circular end plate, the other ends of the plurality of evaporation ring plates are all provided with annular baffles extending inwardly, an end cover rotatably connected to the outer circular surface of the evaporation ring plate is fixed inside the closed outer shell, the end cover is connected to the solvent liquefaction recovery unit through a pipeline, and the other end of the solvent liquefaction recovery unit is connected to a negative pressure generator through a pipeline; the invention adopts a concentric ring heating container composed of a plurality of evaporation ring plates concentrically connected to heat a raw material solution, which greatly improves the efficient and sufficient removal of the solvent in the chemical intermediate solution, and effectively meets the demand for rapid desolventizing of the chemical intermediate solution.

Description

Technical Field

[0001] The invention relates to the technical field of chemical equipment, and in particular discloses a chemical intermediate system standby decompression and desolventizing equipment. Background Art

[0002] In the chemical production process, some chemical intermediates need to be extracted and purified with solvents, and after extraction, they need to be evaporated and desolvated to obtain products with higher purity. Traditional desolvation equipment is completed by using a series of supporting facilities such as evaporator + stirring + decompression. The specific process is to add the raw material liquid into the evaporator, start the vacuum pump to pump the inside of the kettle to negative pressure, and then heat it with the high-temperature medium in the jacket on the surface of the kettle. During the heating process, the raw material solution is stirred to evaporate the solvent, and the evaporated concentrated liquid is discharged from the lower end of the kettle.

[0003] For example, the utility model patent with application number 202222581309.7 discloses a desolventizing kettle for chemical production, including a kettle body, a stirring mechanism and a heating jacket. The stirring mechanism consists of a stirring motor, a stirring vertical shaft and a stirring blade. A cooling chamber is fixed on the top of the kettle body, and the stirring motor is fixed above the cooling chamber. A bearing seat for supporting the output shaft of the stirring motor is provided in the center of the cooling chamber. The end of the output shaft of the stirring motor passes through the bearing seat and the sealing filler at the center of the top surface of the kettle body and enters the kettle body. An insulation layer is fixed on the inner side of the top surface of the kettle body corresponding to the position of the cooling chamber. An annular horizontal distribution cavity is provided in the upper part of the kettle body. A feed pipeline connected to the outside of the kettle body is provided on the top surface of the annular horizontal distribution cavity. Multiple groups of centrally symmetrical distribution nozzles are evenly provided on the lower surface of the annular horizontal distribution cavity. The axis of each group of distribution nozzles intersects with the upper part of the inner wall of the kettle body. The patent discloses using a distribution nozzle to spray the material onto the side wall of the kettle body, and heating the material by the high-temperature medium inside the heating jacket to heat it up and evaporate it. However, the desolventizing efficiency of this type of evaporation desolventizing kettle is not high. This is because the raw material solution can only contact with one layer of the inner wall of the kettle body at most to achieve heat exchange, which leads to a slow heating speed of the raw material solution. For a large amount of chemical intermediate raw material solution that needs to be desolventized, its desolventizing efficiency is seriously restricted. In addition, if the evaporated solvent is liquefied using a conventional condenser, either the size of the condenser can be increased to increase the heat exchange time between the solvent vapor and the cryogenic medium, or the flow rate of the cryogenic medium can be increased to ensure that the solvent vapor is fully liquefied. Therefore, in view of the above-mentioned shortcomings of the existing desolventizing kettles for chemical production, the present application proposes a newly designed chemical intermediate system standby decompression desolventizing equipment to achieve efficient desolventizing of chemical intermediates and rapid liquefaction and recovery of solvent vapor. Summary of the invention

[0004] The present invention aims to provide a vacuum desolventizing device for preparing chemical intermediates, so as to achieve efficient desolventizing of chemical intermediates and sufficient and rapid liquefaction and recovery of solvent vapor.

[0005] The present invention is achieved through the following technical solutions:

[0006] A vacuum desolventizing device for chemical intermediate production, comprising an evaporation unit and a solvent liquefaction recovery unit, wherein the evaporation unit comprises a sealed outer shell, wherein a concentric ring heating container is rotatably arranged on the upper end of the inner cavity of the sealed outer shell, wherein the concentric ring heating container comprises a plurality of concentrically arranged evaporation ring plates, wherein one end of the plurality of evaporation ring plates is commonly connected to a circular end plate, and the other ends of the plurality of evaporation ring plates are all provided with an annular baffle extending inwardly, and an end cover rotatably connected to the outer circumferential surface of the outermost evaporation ring plate is fixed inside the sealed outer shell near one side of the annular baffle, wherein the end cover is connected to the solvent liquefaction recovery unit through a pipeline, and the other end of the solvent liquefaction recovery unit is connected to a negative pressure generator through a pipeline;

[0007] A heating plate is arranged above the outer circular surface of each of the evaporation ring plates, and a fixing frame is commonly connected to one end of the plurality of heating plates close to the annular baffle, and the plurality of heating plates are fixed relative to the closed outer shell through the fixing frame, and a strip opening arranged along the axial direction is opened on each of the evaporation ring plates, and the strip openings on the plurality of evaporation ring plates are arranged at equal angle intervals in the circumferential direction along the rotation direction, and a liquid spray pipe extending out of the closed outer shell and fixedly arranged is arranged in the innermost evaporation ring plate, a row of nozzles is arranged at the lower end of the liquid spray pipe, and the outer end of the liquid spray pipe is connected to a raw material conveying unit.

[0008] The chemical intermediate system spare vacuum desolventing equipment disclosed in the present invention adopts an evaporation unit with a brand-new structural design to evaporate and desolventize the raw material solution. During the specific operation, the concentric ring heating container rotates at a certain speed inside the closed outer shell, so that each evaporation ring plate in the concentric ring heating container can have a certain period of heat exchange with the heating plate during the process of rotating through the upper end, so that the surface of the evaporation ring plate after passing the heating plate can quickly heat up to the set temperature.

[0009] At the same time, the raw material solution is sprayed downward evenly through the nozzle on the spray pipe and contacts the innermost evaporation ring plate, so that the heat on the surface of the evaporation ring plate is fully absorbed by the raw material solution, and the sprayed raw material solution is gathered in the arc evaporation groove formed at the lower end of the innermost evaporation ring plate. In the subsequent rotation process of the evaporation ring plate, the raw material solution in the arc evaporation groove is constantly in contact with the high-temperature area of ​​the rotating evaporation ring plate to further heat it, so that part of the solvent with a low boiling point is evaporated and discharged.

[0010] When the strip opening on the innermost evaporation ring plate rotates to the bottom, the raw material solution in the arc evaporation groove will fall into the outer evaporation ring plate through the strip opening, and then gather in the arc evaporation groove formed at the lower end of the outer evaporation ring plate, and continuously contact with the high-temperature area of ​​the evaporation ring plate rotating from the evaporation ring plate of this layer during the rotation of the concentric ring heating container to heat up, and then evaporate and discharge a part of the solvent with a low boiling point. The raw material solution is heat-exchanged with the multiple layers of evaporation ring plates from the inside to the outside in turn to achieve solvent evaporation and removal until it is discharged from the strip opening on the outermost evaporation ring plate. Therefore, the entire concentric ring heating container can fully remove the solvent in a part of the raw material solution every time it rotates one circle, effectively improving its evaporation and desolventizing efficiency, and realizing the segmented and continuous automatic desolventizing treatment of the raw material solution.

[0011] As a further configuration of the above scheme, the upper end of the closed outer shell is cylindrical, the lower end is cuboid, the concentric ring heating container is concentrically arranged with the cylindrical section at the upper end of the closed outer shell, and the lower end of the closed outer shell is connected to a concentrated liquid discharge pipe. The above is the shape design of the closed outer shell, so that it is more compatible with the rotational movement of the concentric ring heating container, and the concentrated raw material liquid after desolventization can be discharged and collected from the bottom.

[0012] As a further configuration of the above scheme, a hollow shaft is coaxially connected to the circular end plate, the hollow shaft is rotatably connected to a sealed bearing on the side of the closed outer shell, and a driving assembly is connected to the outer end of the hollow shaft. The above design of the hollow shaft can ensure that the concentric ring heating container rotates stably inside the closed outer shell.

[0013] As a further configuration of the above scheme, the liquid spray pipe is arranged along the hollow shaft and extends out of the closed outer shell, and a sealed bearing is arranged between the liquid spray pipe and the hollow shaft. The design of the sealed bearing allows the liquid spray pipe to extend out along the hollow shaft in a sealed manner, and the liquid spray pipe can be centrally arranged in the innermost evaporation ring plate while ensuring internal airtightness.

[0014] As a further configuration of the above scheme, a plurality of the evaporation ring plates are arranged concentrically and at equal intervals, the cross-sectional shape of the heating plate is fan-shaped and is arranged between two adjacent evaporation ring plates, and the heating surface of the heating plate is arranged close to the outer circumferential surface of the corresponding evaporation ring plate. The shape design of the above heating plate can transfer the generated heat to the evaporation ring plate as much as possible, and ensure that each evaporation ring plate has a certain heat exchange time with the heating plate, and ensure that the evaporation ring plate has sufficient heat before heat exchange with the raw material liquid.

[0015] As a further configuration of the above scheme, each of the heating plates is provided downstream along the rotation direction with an infrared temperature sensor disposed toward the outer circumferential surface of the corresponding evaporation ring plate. The temperature of each layer of the evaporation ring plate after heating is detected online by the infrared temperature sensor, and then the power of the corresponding heating plate is adjusted in real time according to the detected temperature, so that the evaporation ring plate after passing through the heating plate can have appropriate heat to rotate to the bottom to heat the raw material solution.

[0016] As a further configuration of the above scheme, the raw material conveying unit includes an infusion pump, and the infusion pump is connected to an infusion tube connected to the outer end of the spray tube.

[0017] As a further configuration of the above scheme, the solvent liquefaction recovery unit includes a condenser liquefier, and an air inlet pipe and an air outlet pipe are respectively arranged on both sides of the upper end of the condenser liquefier, the air inlet pipe is connected to the air extraction pipe on the end cover through a pipeline, and the air outlet pipe is connected to the negative pressure generator through a pipeline.

[0018] As a further configuration of the above scheme, the condenser liquefier includes a cylindrical shell, both ends of the cylindrical shell are connected with inlet and outlet heads, a tube sheet is arranged at the connection between the cylindrical shell and the inlet and outlet heads, a guide spiral blade is arranged between the two tube sheets, a condenser pipe penetrating the guide spiral blade is arranged between the two tube sheets, and both ends of the condenser pipe are respectively connected with the inlet and outlet heads on both sides, and the air inlet pipe and the air outlet pipe are respectively connected with the spiral channels at both ends of the guide spiral blade.

[0019] As a further configuration of the above scheme, the lower end of the cylindrical shell is connected to a collecting groove arranged along the axial direction, and the lower end of the collecting groove is connected to a drain pipe with a control valve.

[0020] The present invention also uses the above-mentioned structural design of the solvent liquefaction recovery unit, so that under the operation of the negative pressure generator, the inside of the evaporation unit is pumped to a negative pressure state to reduce the solvent evaporation temperature, and the solvent vapor can be pumped into the condenser liquefier. The solvent vapor entering the condenser liquefier can flow along the internal spiral channel. The design of the spiral channel can increase the flow path of the solvent vapor under the same size, increase the heat exchange time with the low-temperature medium, and ensure that the solvent vapor can be fully liquefied. Finally, the liquefied solvent will flow and gather in the collection groove, and then be uniformly discharged and recovered from the drain pipe.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The spare reduced-pressure desolventizing equipment for chemical intermediate system disclosed in the present invention abandons the traditional stirring and heating method of the kettle body, and utilizes a concentric ring heating container composed of a plurality of evaporation ring plates connected concentrically to heat the raw material solution, and sprays the raw material solution downward from the innermost evaporation ring plate, so that it first exchanges heat with the innermost evaporation ring plate to achieve temperature increase, and then completes a circle of heat exchange with the innermost evaporation ring plate before falling into the outer evaporation ring plate to complete a circle of heat exchange, and repeats this process until the raw material liquid completes heat exchange with all layers of evaporation ring plates, so that the internal solvent can be fully evaporated and removed, and at the same time, since the multiple layers of ring plates can be heated and heated by the corresponding heating plates at the same time, and the raw material solution can be continuously removed in sections, the efficient and sufficient removal of the solvent in the chemical intermediate solution is greatly improved; the structural design of the entire evaporation unit is ingenious, which effectively solves the problem of low desolventizing efficiency caused by low heat exchange efficiency between the existing evaporation desolventizing kettle and the solution, and effectively meets the demand for rapid desolventizing of the chemical intermediate solution.

[0023] The present invention also improves the structural design of the solvent liquefaction recovery unit. The design of the guide spiral blade can transform the straight channel inside the condenser liquefier into a spiral channel, thereby increasing the internal flow path of the solvent vapor and improving the heat exchange time with the low-temperature medium, so that the solvent vapor can be fully liquefied and recovered inside the condenser of the same size, and has a better condensation and liquefaction effect on the solvent vapor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the three-dimensional structure from a first angle of the present invention;

[0026] Figure 2 It is a schematic diagram of the three-dimensional structure from a second angle of the present invention;

[0027] Figure 3 It is a schematic diagram of the three-dimensional structure inside the evaporation unit of the present invention;

[0028] Figure 4 It is a schematic diagram of the three-dimensional explosion structure of the concentric ring heating container in the present invention;

[0029] Figure 5 It is a schematic diagram of a partial cross-section three-dimensional structure of a concentric ring heating container in the present invention;

[0030] Figure 6It is a schematic diagram of the planar structure when the concentric ring heating container in the present invention heats and evaporates the solution;

[0031] Figure 7 It is a schematic diagram of the internal three-dimensional structure of the condenser-liquefier in the present invention;

[0032] Figure 8 It is a schematic diagram of the three-dimensional structure of the tube plate, the guide spiral blade and the condenser tube in the present invention;

[0033] Fig. 9 For the present invention Figure 6 Schematic diagram of the enlarged structure at point A in the middle.

[0034] Wherein: 1-evaporation unit, 101-sealed outer shell, 102-driving assembly, 103-heating plate, 104-fixing frame, 105-concentrate discharge pipe;

[0035] 2-solvent liquefaction recovery unit, 201-condenser liquefier, 202-inlet pipe, 203-outlet pipe, 204-cylindrical shell, 205-inlet and outlet heads, 206-tube sheet, 207-guide spiral blades, 208-condenser pipe, 209-collecting groove, 210-drain pipe;

[0036] 3-raw material conveying unit, 301-infusion pump, 302-infusion tube, 303-injection tube, 304-spray head;

[0037] 4- Negative pressure generator;

[0038] 5- connecting pipe;

[0039] 6-concentric ring heating container, 601-evaporation ring plate, 602-circular end plate, 603-annular baffle, 604-hollow shaft, 605-end cover, 606-exhaust pipe, 607-strip port;

[0040] 7-air extraction pipe;

[0041] 8-Infrared temperature sensor. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0043] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. Figures 1 to 9 , and describes the application in detail with reference to embodiments.

[0044] Example 1

[0045] Example 1 discloses a chemical intermediate system standby decompression desolventizing equipment, see attached Figure 1 and attached Figure 2 The main body of the device includes an evaporation unit 1, a solvent liquefaction recovery unit 2, a raw material delivery unit 3 and a negative pressure generator 4. The raw material delivery unit 3 delivers the raw material solution into the evaporation unit 1 for evaporation and desolvation. A connecting pipe 5 is provided between the solvent liquefaction recovery unit 2 and the evaporation unit 1. The evaporated solvent vapor is sucked into the interior through the connecting pipe 5 and liquefied and recovered. Finally, the negative pressure generator 4 is connected to the other end of the solvent liquefaction recovery unit 2 to provide a negative pressure environment during the decompression and desolvation process.

[0046] Reference Figures 2 to 6 The evaporation unit 1 includes a sealed outer shell 101, the upper end of which is cylindrical and the lower end is rectangular. A concentric ring heating container 6 is rotatably mounted inside the sealed outer shell 101 and is concentric with the cylindrical section at the upper end of the sealed outer shell 101. A concentrated liquid discharge pipe 105 is arranged at the lower end of the sealed outer shell 101.

[0047] The concentric ring heating container 6 includes a plurality of evaporation ring plates 601 arranged concentrically and at equal intervals, and the evaporation ring plates 601 in the present figure are arranged in four. A circular end plate 602 is commonly connected to one end of the four evaporation ring plates 601, and an annular baffle 603 extending inward is arranged at the other end of the four evaporation ring plates 601, so that the lower end of each evaporation ring plate 601 forms an arc evaporation groove for containing the raw material solution. A hollow shaft 604 is concentrically connected to the circular end plate 602, and the hollow shaft 604 is rotatably connected to the sealed bearing on the end face of the closed outer shell 101, and then a driving assembly 102 is connected to the outer end of the hollow shaft 604 extending out of the closed outer shell 101. The driving assembly 102 can adopt a transmission mode of motor + belt or motor + gear, so that the entire concentric ring heating container 6 can be driven to rotate at a set speed inside the closed outer shell 101 under the input of motor power. At the same time, an end cover 605 fixed relative to the closed outer shell 101 is provided at the other end of the four evaporation ring plates 601, and the end cover 605 is sealed and rotatably connected to the outer cylindrical surface of the outermost evaporation ring plate 601. Finally, an exhaust pipe 606 extending out of the closed outer shell 101 is connected to the end cover 605.

[0048] Each evaporation ring plate 601 is provided with a strip-shaped opening 607 arranged along the axial direction (see the attached Fig. 9), and the strip openings 607 on the multiple evaporation ring plates 601 are arranged at equal angles in the circumferential direction along the direction of rotation. Taking the concentric arrangement of four layers of evaporation ring plates 601 as an example, the strip openings 607 on two adjacent evaporation ring plates 601 form an angle of 90° in the circumferential direction. A heating plate 103 is fixedly arranged above the outer circumferential surface of each evaporation ring plate 601. In the specific arrangement, the cross-sectional shape of the heating plate 103 is fan-shaped, which is arranged between two adjacent evaporation ring plates 601, and its heating surface is arranged close to the outer circumferential surface of the corresponding evaporation ring plate 601, so that the heat generated by the heating plate 103 can be transferred to the evaporation ring plate 601 as much as possible. A fixing frame 104 is commonly connected to one end of the multiple heating plates 103 close to the annular baffle 603, and the end of the fixing frame 104 is sealed and extended out of the end cover 605 and the closed outer shell 101. In order to prevent the heat generated by the heating plate 103 from being transferred to the outside of the closed outer shell 101 through the fixing frame 104, the fixing frame 104 is preferably made of ceramic material. In addition, an infrared temperature sensor 8 is provided downstream of each heating plate 103 along the rotation direction and is arranged toward the outer surface of the corresponding evaporation ring plate 601. The temperature of each evaporation ring plate 601 after heating is detected online through the infrared temperature sensor 8. When it is found that the temperature of the evaporation ring plate 601 after heating is too low, the power of the corresponding heating plate 103 can be actively increased through the control system; conversely, when it is found that the temperature of the evaporation ring plate 601 after heating is too high and may cause damage to the raw material components, the power of the corresponding heating plate 103 can be actively reduced.

[0049] The raw material delivery unit 3 includes an infusion pump 301 disposed on one side of the sealed outer shell 101, and an infusion pipe 302 is connected to the infusion pump 301, and then a liquid spraying pipe 303 is connected to the end of the liquid spraying pipe 302 along a hollow shaft 604 and extending into the center of the innermost evaporation ring plate 601, and the hollow shaft 604 and the liquid spraying pipe 303 are also connected by a sealed bearing to ensure the airtightness of the entire sealed outer shell 101. Then, a row of nozzles 304 are arranged at the lower end of the liquid spraying pipe 303 located in the evaporation ring plate 601, and the chemical raw material liquid can be sprayed to the lower end of the innermost evaporation ring plate 601 through the nozzles 304.

[0050] Reference Figure 1 and attached Figure 2The solvent liquefaction recovery unit 2 includes a condenser liquefier 201, and the two ends of the condenser liquefier 201 are respectively provided with a cooling medium inlet and outlet, and then an air inlet pipe 202 is provided on one side of the upper end of the condenser liquefier 201, and the two ends of the connecting pipe 5 are respectively connected to the air inlet pipe 202 and the air extraction pipe 606. An air outlet pipe 203 is provided on the other side of the upper end of the condenser liquefier 201, and then an air extraction pipe 7 is connected between the air outlet pipe 203 and the negative pressure generator 4. Specifically, the negative pressure generator 4 can be an air extraction pump or a vacuum pump. The evaporation unit 1 and the solvent liquefaction recovery unit 2 can be continuously evacuated by the negative pressure generator 4, so that a negative pressure state is formed inside the two.

[0051] When the vacuum desolventizing equipment disclosed in this embodiment 1 is used for evaporation and desolventizing of a chemical intermediate raw material solution, the negative pressure generator 4 is first started to evacuate the inside of the evaporation unit 1 and the solvent liquefaction recovery unit 2 to a negative pressure state, and then the circuit of the heating plate 103 is connected to make the heating plate 103 generate heat. During the rotation of the concentric ring heating container 6, the heat generated by the heating plate 103 is evenly absorbed by the corresponding evaporation ring plate 601.

[0052] Then, the infusion pump 301 is started to deliver a certain amount of chemical intermediate raw material solution to the spray pipe 303 each time, and then sprayed to the lower end of the inner surface of the innermost evaporation ring plate 601 through the nozzle 304, so that the sprayed chemical intermediate raw material solution is located in the arc evaporation groove formed by the innermost evaporation ring plate 601, and during the continued rotation of the concentric ring heating container 6, this part of the solution continuously contacts with the new high-temperature area of ​​the innermost evaporation ring plate 601 to achieve rapid heating and evaporation, and the evaporated solvent vapor enters the condenser liquefier 201 under negative pressure suction to achieve liquefaction recovery.

[0053] When the strip opening 607 on the innermost evaporation ring plate 601 rotates to the bottom, the solution in the arc-shaped evaporation groove falls into the outer evaporation ring plate 601 through the strip opening 607. At the same time, when the strip opening 607 rotates upward from the bottom to a certain angle, it has a certain height difference with the bottom of the evaporation ring plate 601, and then a certain amount of chemical intermediate raw material solution is sprayed into the innermost evaporation ring plate 601 through the nozzle 304 again to repeat the above steps to achieve heating and evaporation of the next batch of raw material solutions. In addition, during the spraying of the next batch of raw material solutions, it is necessary to ensure that the spraying speed is not too fast to prevent the raw material solution that has not yet fully exchanged heat with the innermost evaporation ring plate 601 from quickly rising to the height of the strip opening 607 at this time and directly flowing down from it.

[0054] The solution falling into the outer evaporation ring plate 601 will continue to absorb the heat on the evaporation ring plate 601 of this layer to continue to heat up and evaporate, and the evaporation ring plate 601 in the continuous rotation process can be continuously heated again by the corresponding heating plate 103 above. Finally, when the strip opening 607 on the evaporation ring plate 601 of this layer rotates to the lowest end, the solution is discharged to the outer evaporation ring plate 601 to repeat the above process, so that the solution enters each layer of the evaporation ring plate 601 in turn during the reduced pressure evaporation and desolvation process, and absorbs the heat on its surface to evaporate and remove the solvent, until the concentrated aqueous solution after complete desolvation is discharged from the strip opening 607 on the outermost evaporation ring plate 601 into the inner cavity at the lower end of the closed outer shell 101.

[0055] Example 2

[0056] Example 2 discloses a chemical intermediate system standby vacuum desolventizing equipment which is further optimized and improved based on the technical solution in Example 1, and mainly improves the design of the solvent liquefaction recovery unit 2.

[0057] The similarities between Example 2 and Example 1 are not described again. Figure 7 and attached Figure 8 The solvent liquefaction recovery unit 2 in this embodiment 2 includes a condenser liquefier 201, and the two ends of the condenser liquefier 201 are respectively provided with a cooling medium inlet and outlet, and then an air inlet pipe 202 is provided on one side of the upper end of the condenser liquefier 201, and the two ends of the connecting pipe 5 are respectively connected to the air inlet pipe 202 and the air extraction pipe 606.

[0058] The condenser liquefier 201 includes a horizontally arranged cylindrical shell 204, with inlet and outlet headers 205 connected to both ends of the cylindrical shell 204, and the inlet and outlet of the cooling medium are respectively arranged on the inlet and outlet headers 205 on both sides. A tube sheet 206 is sealed at each opening where the cylindrical shell 204 is connected to the inlet and outlet headers 205, and then a guide spiral blade 207 is arranged between the two tube sheets 206. At the same time, a plurality of condensing tubes 208 penetrating the guide spiral blades 207 are arranged between the two tube sheets 206, and the two ends of the condensing tubes 208 are respectively connected to the inlet and outlet headers 205 on both sides.

[0059] The air inlet pipe 202 and the air outlet pipe 203 are connected to the two sides of the upper end of the cylindrical shell 204, and are respectively connected to the spiral channels at the two ends of the guide spiral blade 207. The lower end of the cylindrical shell 204 is connected to a collection groove 209 arranged along the axial direction, and then the lower end of the collection groove 209 is connected to a discharge pipe 210 with a control valve.

[0060] In this embodiment 2, the structural design of the condenser liquefier 201 can form a spiral channel inside the cylindrical shell 204, thereby extending the path of the solvent vapor flowing inside the cylindrical shell 204 and increasing the heat exchange time between the solvent vapor and the cooling medium. At the same time, since the guide spiral blade 207 is connected to the condenser tube 208, the guide spiral blade 207 can also be used as a heat exchange fin to perform heat exchange on the solvent vapor, which greatly improves the condensation effect of the solvent vapor, so that the solvent vapor can be fully liquefied and recovered after passing through the spiral channel.

[0061] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A vacuum desolventizing device for use in a chemical intermediate system, comprising an evaporation unit (1) and a solvent liquefaction recovery unit (2), characterized in that: The evaporation unit (1) comprises a sealed outer shell (101), a concentric ring heating container (6) being rotatably arranged at the upper end of the inner cavity of the sealed outer shell (101), the concentric ring heating container (6) comprising a plurality of concentrically arranged evaporation ring plates (601), one end of the plurality of evaporation ring plates (601) being commonly connected to a circular end plate (602), the other ends of the plurality of evaporation ring plates (601) all having an annular baffle (603) extending inwardly, an end cover (605) rotatably connected to the outer circumferential surface of the outermost evaporation ring plate (601) being fixed inside the sealed outer shell (101) on a side close to the annular baffle (603), the end cover (605) being connected to the solvent liquefaction recovery unit (2) via a pipeline, and the other end of the solvent liquefaction recovery unit (2) being connected to the negative pressure generator (4) via a pipeline; A heating plate (103) is arranged above the outer circumferential surface of each evaporation ring plate (601), and one end of the plurality of heating plates (103) close to the annular baffle (603) is commonly connected to a fixing frame (104), and the plurality of heating plates (103) are fixedly arranged relative to the sealed outer shell (101) via the fixing frame (104), and each of the evaporation ring plates (601) is provided with a strip opening (607) arranged along the axial direction, and the strip openings (607) on the plurality of evaporation ring plates (601) are arranged at equal angular intervals in the circumferential direction along the rotation direction, and a liquid spray pipe (303) extending out of the sealed outer shell (101) and fixedly arranged is arranged in the innermost evaporation ring plate (601), a row of nozzles (304) is arranged at the lower end of the liquid spray pipe (303), and the outer end of the liquid spray pipe (303) is connected to a raw material conveying unit (3).

2. The vacuum desolventizing equipment for chemical intermediate system according to claim 1, characterized in that: The upper end of the sealed outer shell (101) is cylindrical, and the lower end is rectangular; the concentric ring heating container (6) is arranged concentrically with the cylindrical section at the upper end of the sealed outer shell (101); and the lower end of the sealed outer shell (101) is connected to a concentrated liquid discharge pipe (105).

3. The vacuum desolventizing equipment for chemical intermediate system according to claim 2 is characterized in that: A hollow shaft (604) is coaxially connected to the circular end plate (602), the hollow shaft (604) is rotatably connected to a sealed bearing on the side of the sealed outer shell (101), and the outer end of the hollow shaft (604) is connected to a drive assembly (102).

4. The vacuum desolventizing equipment for chemical intermediate production according to claim 3, characterized in that: The liquid spraying pipe (303) is arranged along the hollow shaft (604) and extends out of the sealed outer shell (101), and a sealed bearing is arranged between the liquid spraying pipe (303) and the hollow shaft (604).

5. The vacuum desolventizing equipment for chemical intermediate system according to claim 1, characterized in that: The plurality of evaporation ring plates (601) are arranged concentrically and at equal intervals; the cross-sectional shape of the heating plate (103) is fan-shaped and is arranged between two adjacent evaporation ring plates (601); and the heating surface of the heating plate (103) is arranged close to the outer circumferential surface of the corresponding evaporation ring plate (601).

6. The vacuum desolventizing equipment for chemical intermediate production according to claim 1, characterized in that: Each of the heating plates (103) is provided with an infrared temperature sensor (8) disposed downstream along the rotation direction and facing the outer circumferential surface of the corresponding evaporation ring plate (601).

7. The vacuum desolventizing equipment for chemical intermediate production according to claim 1, characterized in that: The material conveying unit (3) comprises an infusion pump (301), and the infusion pump (301) is connected to an infusion tube (302) connected to the outer end of a liquid spraying tube (303).

8. The vacuum desolventizing equipment for chemical intermediate production according to claim 1, characterized in that: The solvent liquefaction recovery unit (2) comprises a condenser liquefier (201), an air inlet pipe (202) and an air outlet pipe (203) are respectively arranged on both sides of the upper end of the condenser liquefier (201), the air inlet pipe (202) is connected to an air extraction pipe (606) on an end cover (605) via a pipeline, and the air outlet pipe (203) is connected to a negative pressure generator (4) via a pipeline.

9. The vacuum desolventizing equipment for chemical intermediate production according to claim 8, characterized in that: The condenser liquefier (201) comprises a cylindrical shell (204), both ends of the cylindrical shell (204) are connected to inlet and outlet heads (205), a tube sheet (206) is provided at the connection between the cylindrical shell (204) and the inlet and outlet heads (205), a guide spiral blade (207) is provided between the two tube sheets (206), a condenser tube (208) penetrating the guide spiral blade (207) is provided between the two tube sheets (206), and both ends of the condenser tube (208) are respectively connected to the inlet and outlet heads (205) on both sides, and the air inlet pipe (202) and the air outlet pipe (203) are respectively connected to the spiral channels at both ends of the guide spiral blade (207).

10. The vacuum desolventizing equipment for chemical intermediate production according to claim 9, characterized in that: The lower end of the cylindrical shell (204) is connected to a collecting groove (209) arranged along the axial direction, and the lower end of the collecting groove (209) is connected to a liquid discharge pipe (210) with a control valve.

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