A liquid separation kettle for producing diethyl malonate

Abstract

A liquid separator for diethyl malonate production relates to the technical field of liquid separators, comprising a support base, two vertically fixed support plates are horizontally arranged side by side on the top of the support base, a liquid separator body with an opening on the top is vertically arranged between the two support plates, the liquid separator body is rotatably connected to the two support plates, a sealing component for controlling the opening and closing of the open end of the liquid separator body is arranged inside the liquid separator body, a liquid separator component is arranged at the position where the solution is layered inside the liquid separator body, and a solid-liquid separation mechanism that can be connected to the open end of the liquid separator body is arranged above the liquid separator body. The present invention solves the problems of the complicated post-processing procedures of the reaction solution of the existing solid-liquid separation device and liquid separator for diethyl malonate production; the problem that the machine needs to be shut down for cleaning the filter plate, which affects the solid-liquid separation speed; the problem that the cleaning process of solid matter on the surface of the filter plate is cumbersome; and the problem that the solution discharge speed after static separation is slow and the discharge process is complicated.

Description

Technical Field

[0001] The invention relates to the technical field of liquid separation kettles, in particular to a liquid separation kettle for producing diethyl malonate. Background Art

[0002] Diethyl malonate is an important fine chemical raw material. Since the methylene hydrogen in its molecule can be easily replaced by various groups, it can generate a variety of important derivatives and is widely used in various chemical production fields, including food, medicine, pesticides, industrial dyes, liquid crystal materials and other industries. In recent years, with the further development and application of downstream products of diethyl malonate at home and abroad, the demand for diethyl malonate has increased sharply, and the domestic demand for diethyl malonate is relatively large.

[0003] The preparation process of diethyl malonate is as follows: ethyl chloroacetate, magnetic silica gel immobilized cobalt metal complex acetate, ammonia water, and ethanol are added to a stainless steel autoclave, and the mixture is uniformly mixed; the air in the autoclave is replaced by carbon monoxide, and then carbon monoxide is charged and maintained at a certain pressure; the reaction solution is heated and stirred for reaction to obtain a reaction solution, wherein the reaction solution is a solid-liquid mixed system; the reaction solution after cooling is first passed through a solid-liquid separation device to separate the solid from the solution; and then the incompatible liquid in the solution is statically separated through a liquid separation device; the solution obtained after separation is rectified to obtain the product diethyl malonate; therefore, a solid-liquid separation device and a liquid separation device are required in the preparation process of diethyl malonate.

[0004] The existing solid-liquid separation device and liquid separation device for diethyl malonate production gradually exposed their shortcomings during use, mainly in the following aspects:

[0005] First, the post-processing process of the reaction solution is complicated. Specifically, the solid-liquid separation device and the liquid separator are two different devices. In the process of treating the reaction solution, the solid and the solution in the reaction solution are first separated by the solid-liquid separation device, and then the separated solution is collected and transferred to the liquid separator for static separation. Therefore, the post-processing process of the reaction solution is complicated.

[0006] Second, the filter plate is easily clogged, and the machine needs to be shut down for cleaning, which affects the speed of solid-liquid separation. Specifically, during the solid-liquid separation of the reaction solution, the separated solid matter accumulates on the surface of the filter plate. As the solid matter on the surface of the filter plate continues to increase, the liquid passage of the filter plate is gradually clogged, which leads to a slow solid-liquid separation speed. When cleaning the filter plate, the device needs to be shut down and the filter plate needs to be removed from the device for cleaning, thus affecting the speed of solid-liquid separation.

[0007] Third, the cleaning process of solid matter on the surface of the filter plate is cumbersome. Specifically, after the solid-liquid separation of the reaction solution is completed or when the filter plate is blocked, the solid matter on the surface of the filter plate needs to be cleaned. When cleaning the filter plate, the staff needs to use a cleaning brush to clean the solid matter adhered to the surface of the filter plate. After the filter plate is cleaned, the cleaned solid matter is collected. Therefore, the cleaning process of solid matter on the surface of the filter plate is cumbersome.

[0008] Fourth, the discharge speed of the solution after static separation is slow, and the discharge process is complicated. Specifically, when discharging the solution after static separation, the lower solution is first discharged through the discharge port. In order to prevent the upper solution from mixing with the lower solution again during the discharge process, the discharge speed of the solution is controlled to be slow. When the lower solution is discharged near the stratification position, in order to ensure the purity of the solution, a collection container is needed to collect the solution near the stratification position, and then the upper solution is discharged. After the discharge is completed, the collected solution is added to the liquid separation device again for separation to avoid waste.

[0009] In summary, the prior art obviously has inconveniences and defects in practical use, so it is necessary to improve it. Summary of the invention

[0010] In view of the defects in the prior art, the technical problem to be solved by the present invention is to provide a liquid separator for the production of diethyl malonate, which has both solid-liquid separation and liquid separation functions. After the solid-liquid separation of the reaction solution is completed, it can be directly statically separated, which simplifies the post-treatment process of the reaction solution.

[0011] The liquid separator can also automatically clean and collect the solid matter accumulated on the surface of the filter plate without stopping the solid-liquid separation of the reaction solution, so that the surface of the filter plate always maintains less solid matter, ensuring the solid-liquid separation speed of the reaction solution;

[0012] After the solid-liquid separation of the reaction solution is completed, the liquid separator can also automatically clean and collect all solid substances generated during the solid-liquid separation process, simplifying the cleaning process of the solid substances;

[0013] The liquid separation kettle can also simplify the discharge process of the solution after static separation, speed up the discharge speed of the solution after static separation, and no mixing will occur during the solution discharge process.

[0014] To solve the above problems, the present invention provides the following technical solutions:

[0015] A liquid separation kettle for producing diethyl malonate, comprising a supporting base, wherein two vertically fixed support plates are horizontally arranged in parallel on the top of the supporting base, a liquid separation kettle body with an opening on the top is vertically arranged between the two support plates, the liquid separation kettle body is rotatably connected to the two support plates, a closing component for controlling the opening and closing of the open end of the liquid separation kettle body is arranged inside the liquid separation kettle body, a liquid separation component is arranged at a position where the solution is layered inside the liquid separation kettle body, a solid-liquid separation mechanism that can be connected to the open end of the liquid separation kettle body is arranged above the liquid separation kettle body, a constant pressure valve and a drain valve that are connected to the inner cavity of the liquid separation component are fixedly arranged on the outer wall of the liquid separation kettle body at positions above and below the liquid separation component, the constant pressure valve and the drain valve are evenly distributed along the circumferential direction, a rotary drive motor is fixedly arranged at the end of one of the support plates, and the output end of the rotary drive motor passes through the support plate and is fixedly connected to the liquid separation kettle body;

[0016] The liquid separation assembly includes two fixed rings coaxially arranged with the liquid separation kettle body, the outer wall of the fixed ring is fixedly connected with the inner wall of the liquid separation kettle body, the top and bottom of the fixed ring are both inclined structures, and the inclined ends facing each other of the two fixed rings are paved with sealing pads.

[0017] The inner part of the liquid separation kettle body is coaxially provided with a fixedly arranged fixed tube at a position between the two fixed rings, the outer wall of the fixed tube is sleeved with two vertically arranged lifting tubes, the lifting tube is vertically sliding and sealingly connected to the fixed tube, the two opposite ports of the lifting tubes extend to the outside of the fixed tube in opposite directions, and are coaxially fixed with a conical plate, the inner wall of the fixed tube is uniformly distributed with two vertically fixedly arranged two-way telescopic cylinders along the circumferential direction, the two telescopic ends of the two-way telescopic cylinders are fixedly connected to the two conical plates through a push rod, the outer wall of the fixed tube is fixedly provided with two horizontally penetrating support tubes, one of the ports of the support tubes penetrates the liquid separation kettle body and is fixedly connected to the liquid separation kettle body, and the outer wall of the lifting tube is provided with two avoidance grooves matching the support tubes;

[0018] The sealing component includes a fixed circular plate which is coaxial with the liquid separation kettle body and fixedly connected to the inner wall thereof, a plurality of leakage grooves are uniformly distributed along the circumferential direction on the top of the fixed circular plate, and the leakage grooves are fan-shaped structures, a lifting rod which is coaxially connected to the fixed circular plate and slidingly connected thereto is coaxially penetrated on the top of the fixed circular plate, a driven circular plate is coaxially fixedly connected to the top of the lifting rod, and a plurality of fixedly arranged fan-shaped sealing plates are uniformly distributed along the circumferential direction on the bottom of the driven circular plate.

[0019] As an optimized solution, the solid-liquid separation mechanism includes a vertically arranged outer separation cylinder, both ends of the outer separation cylinder are opened, a transition cylinder with an open top is coaxially arranged above the outer separation cylinder, the top of the outer separation cylinder extends upward through the transition cylinder to the inside and is fixedly connected thereto, an inner separation cylinder with openings at both ends is coaxially fixedly connected to the upper inner wall of the outer separation cylinder, the top of the inner separation cylinder extends upward to the outside of the outer separation cylinder, a filter plate is coaxially fixedly connected to the inner wall of the inner separation cylinder, and the top surface of the filter plate is flush with the top surface of the outer separation cylinder.

[0020] The outer wall of the inner separation cylinder is located outside the outer separation cylinder and is evenly distributed along the circumferential direction with a plurality of waste discharge grooves that penetrate therethrough. The waste discharge groove penetrates the inner separation cylinder downwardly, and a lifting arc plate that slides vertically in the waste discharge groove to control its opening and closing is provided. The inner wall and outer wall of the lifting arc plate are in frictional contact with the filter plate and the outer separation cylinder respectively, and a rotating shaft that is rotatably arranged is coaxially provided on the top of the filter plate, and a plurality of inner cleaning plates that are in frictional contact with the filter plate are evenly distributed on the outer wall of the rotating shaft along the circumferential direction. The top surface of the outer separation cylinder is an inclined structure, and a conical sleeve is fixedly mounted on the outer wall of the outer separation cylinder at a position below the transition cylinder, and the top of the conical sleeve is fixedly connected to the bottom of the transition cylinder, and a plurality of liquid drainage grooves are evenly distributed along the circumferential direction at a position where the outer wall of the outer separation cylinder is located inside the conical sleeve, and a plurality of filter holes are penetrated at a position where the bottom of the transition cylinder is located inside the conical sleeve and at the top of the filter plate.

[0021] Two fixed brackets are vertically fixed to the top of the support plate, wherein a rotating plate rotatably connected to the two fixed brackets is provided between the two fixed brackets on the top of one of the support plates, the outer separation cylinder is fixedly connected to the rotating plate via a connecting plate, and a rotating bracket rotatably connected to the two fixed brackets is provided between the two fixed brackets on the top of the other support plate, the upper outer wall of the inner separation cylinder is sleeved with a one-way rotating tube rotatably connected to the inner separation cylinder, the upper port of the one-way rotating tube extends upward to the outside of the inner separation cylinder, one end of the rotating bracket is fixedly connected to a sealing circular plate for controlling the opening and closing of the upper port of the one-way rotating tube, and a liquid inlet valve is fixedly provided on the top of the sealing circular plate.

[0022] As an optimized solution, a rectangular groove is provided on the top of the rotating plate and is penetrated from left to right. A rotating plate is provided in the rectangular groove. The opposite side walls of the rotating plate are rotatably connected to the opposite inner walls of the rectangular groove. One end of the rotating plate extends out of the rectangular groove and is fixedly connected to a collecting cylinder with openings at both ends. The lower end of the collecting cylinder is hinged with a closed circular plate for controlling its opening and closing.

[0023] The outer wall of the one-way rotating tube is evenly distributed with two fixed connecting brackets along the circumferential direction, one end of the connecting bracket extends downward into the transition tube and is fixedly connected with an outer cleaning plate in friction contact with the inner bottom of the transition tube, and the opposite side walls of the outer cleaning plate are in friction contact with the transition tube and the outer separation tube respectively, and the rotating shaft is connected to the one-way rotating tube through a one-way transmission assembly.

[0024] As an optimized solution, the one-way transmission assembly includes a transition circular plate rotatably mounted on the outer wall of a rotating shaft, a ratchet is coaxially fixed to the top of the rotating shaft, two pawls that cooperate with the ratchet are rotatably provided on the top of the transition circular plate, two tension springs are provided above the transition circular plate, both ends of the tension springs are correspondingly connected to the pawls and the transition circular plate through positioning rods, and the transition circular plate is connected to the one-way rotating tube through two transmission plates.

[0025] As an optimized solution, a support tube with an open top is coaxially fixed to the bottom of the fixed circular plate, a built-in telescopic cylinder is fixedly provided on the inner bottom of the support tube, and the telescopic end of the built-in telescopic cylinder is fixedly connected to the lifting rod.

[0026] As an optimized solution, the bottom of the filter plate is coaxially fixed with an upper limit cylinder with sealing ends, and a built-in motor is arranged in the upper limit cylinder. The bottom of the rotating shaft passes through the filter plate, and the output end of the built-in motor passes through the upper limit cylinder and is fixedly connected to the rotating shaft.

[0027] As an optimized solution, the bottom of the upper limit cylinder is coaxially fixed with a lower limit cylinder with sealing arrangements at both ends, the bottom of the lower limit cylinder is coaxially penetrated by a driving rod with a sliding arrangement, the bottom of the driving rod is fixed with a driving plate, and several of the lifting arc plates are fixedly connected to the driving plate through a transition plate, an electric-controlled telescopic cylinder is fixedly provided on the inner top of the lower limit cylinder, and the telescopic end of the electric-controlled telescopic cylinder is fixedly connected to the driving rod.

[0028] As an optimized solution, the ends of the two fixed brackets located on the top of different support plates are fixed with rotation control motors, and the output ends of the two rotation control motors pass through the two fixed brackets respectively and are fixedly connected to the rotating brackets and the rotating plates accordingly.

[0029] As an optimized solution, a rotation control motor is fixedly provided at the end of the rotating plate, and the output end of the rotation control motor passes through the rotating plate and is fixedly connected to the rotating plate.

[0030] As an optimized solution, an upper fixing plate is vertically fixed to the outer wall of the collecting cylinder, and a limiting bolt threadedly connected to the end of the upper fixing plate is penetrated through the end of the upper fixing plate. A lower fixing plate is vertically fixed to the side wall of the closed circular plate, and a threaded hole matching the limiting bolt is penetrated through the end of the lower fixing plate.

[0031] Compared with the prior art, the present invention has the following beneficial effects:

[0032] 1. When the reaction solution is subjected to solid-liquid separation, one of the rotary control motors drives the rotary plate to rotate until the lower port of the outer separation cylinder abuts against the upper port of the liquid separation kettle body, and the outer separation cylinder is connected to the liquid separation kettle body, and the other rotary control motor drives the rotary bracket to rotate until the bottom of the sealing circular plate abuts against the top of the one-way rotating tube, and then the upper port of the one-way rotating tube is closed, and a certain amount of reaction solution is discharged into the inner separation cylinder through the liquid inlet valve. The reaction solution can be separated into solid and liquid when passing through the filter plate, and the solid matter is trapped on the top of the filter plate. The solution enters the reactor body through the filter hole. After the reaction solution completes the solid-liquid separation, it can be directly placed in the liquid separation kettle body for static separation. The equipment has both solid-liquid separation and liquid separation functions. After the reaction solution completes the solid-liquid separation, it can be directly placed in the liquid separation kettle body for static separation, which simplifies the post-processing process of the reaction solution;

[0033] 2. In the process of solid-liquid separation of the reaction solution, when a certain amount of solid matter accumulates on the top of the filter plate, the electric control telescopic cylinder drives the driving rod and the driving plate to move downward. With the cooperation of the transition plate, the lifting arc plate slides downward until the top surface of the lifting arc plate is flush with the top surface of the filter plate. The built-in motor drives the rotating shaft and the inner cleaning plate to rotate forward. At this time, the ratchet does not transmit the pawl, and the rotating inner cleaning plate cleans the solid matter accumulated on the surface of the filter plate. The cleaned solid matter enters the transition cylinder through the waste discharge groove. In the process of cleaning the filter plate, part of the solution passes through the filter plate and then passes through the outer separation cylinder to enter the liquid separation kettle body. The remaining reaction solution enters the transition cylinder through the waste discharge groove, and after being filtered by the transition cylinder, it passes through the conical sleeve, the liquid discharge groove and the outer separation cylinder in turn to enter the liquid separation kettle body, realizing the function of automatically cleaning and collecting the solid matter accumulated on the surface of the filter plate without stopping the solid-liquid separation of the reaction solution, so that the surface of the filter plate always keeps less solid matter, ensuring the solid-liquid separation speed of the reaction solution;

[0034] 3. After the quantitative reaction solution completes the solid-liquid separation, the built-in telescopic cylinder drives the lifting rod, the driven circular plate and several fan-shaped sealing plates to move downward until the fan-shaped sealing plate closes the leakage groove. One of the rotary control motors drives the rotary bracket to rotate until the bottom of the sealing circular plate is separated from the one-way rotating tube. The rotary control motor drives the rotating plate and the collecting cylinder to rotate until the upper port of the collecting cylinder is against the opening end of the transition cylinder. Another rotary control motor drives the rotating plate to rotate until the opening end of the transition cylinder is downward, and the solid matter accumulated on the filter plate surface and the transition cylinder falls into the collecting cylinder. The built-in motor drives the rotating shaft and the inner cleaning plate to rotate in the opposite direction. At this time, the ratchet drives the pawl to drive the transition circle. The plate, the transmission plate and the one-way rotating tube rotate, thereby driving the connecting bracket and the outer cleaning plate to rotate, and the inner cleaning plate and the outer cleaning plate respectively clean the solid matter adhered to the surface of the filter plate and the transition tube, and the cleaned solid matter enters the collecting tube for collection. After the cleaning is completed, the staff puts the collecting container under the collecting tube, and rotates the limit bolt to separate it from the lower fixed plate, and rotates the closed circular plate downward, so that the lower port of the collecting tube is opened, and the solid matter in the collecting tube falls into the collecting container for unified collection, realizing the function of automatically cleaning and collecting all solid matter generated in the solid-liquid separation process after the solid-liquid separation of the reaction solution is completed, simplifying the cleaning process of the solid matter;

[0035] 4. After the solution in the liquid separation kettle body is statically separated, the position of the solution layer is located between the two fixed rings. The two-way telescopic cylinder drives the two conical plates to move relative to each other until the two conical plates are against the sealing gasket. At this time, the upper solution and the lower solution in the liquid separation kettle body are completely separated. The rotary drive motor drives the liquid separation kettle body to rotate to a horizontal state, opens the constant pressure valve and the drain valve, and the upper solution and the lower solution are discharged to the outside through different drain valves for collection at the same time. After the solution is discharged, the constant pressure valve and the drain valve are closed, and the rotary drive motor drives the liquid separation kettle body to rotate to a vertical state. The two-way telescopic cylinder drives the two conical plates to move toward each other, and the solution between the two fixed rings is completely separated. The liquid enters the bottom of the liquid separation kettle body, and this part of the solution can be statically separated together with the solution that completes the solid-liquid separation later. Repeating the above operation can continuously perform solid-liquid separation and static separation on the solution. By adopting the method of sealing the solution at the stratification position and completely separating the upper solution from the lower solution at the same time, not only can the separated solution be quickly discharged to the outside of the liquid separation kettle body through different drain valves at the same time, the discharge speed of the solution after static separation is accelerated, and there will be no mixing during the solution discharge process. At the same time, the operations of collecting, transferring and re-adding the solution at the stratification position can be omitted, simplifying the discharge process of the solution after static separation. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the description of the prior art. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0037] Figure 1 It is a structural schematic diagram of the present invention;

[0038] Figure 2 It is a schematic diagram of the structure inside the liquid separation kettle body of the present invention;

[0039] Figure 3 It is a structural schematic diagram of the liquid separation component of the present invention;

[0040] Figure 4 It is a schematic diagram of the structure inside the transition cylinder and the outer separation cylinder of the present invention;

[0041] Figure 5 It is a schematic diagram of the structure inside the inner separation cylinder of the present invention;

[0042] Figure 6 It is a structural schematic diagram of the top of the filter plate of the present invention;

[0043] Figure 7 It is a structural schematic diagram of a one-way transmission assembly of the present invention;

[0044] Figure 8 It is a schematic diagram of the structure inside the support tube of the present invention;

[0045] Fig. 9 This is a schematic diagram of the structure when the lower port of the collecting tube of the present invention is opened;

[0046] Fig.10 It is a schematic diagram of the structure of the liquid separation kettle body of the present invention when discharging the solution outward.

[0047] In the figure: 1-support base; 2-support plate; 3-liquid separation kettle body; 4-rotation control motor; 5-rotation bracket; 6-solid-liquid separation mechanism; 7-liquid inlet valve; 8-sealing circular plate; 9-rectangular groove; 10-rotation plate; 11-collection cylinder; 12-sealed circular plate; 13-rotation control motor; 14-rotation plate; 15-connecting plate; 16-fixed bracket; 17-rotation drive motor; 18-sealing pad; 19-liquid separation component; 20-fixed ring; 21-constant pressure valve; 22-sealing component; 23-sector-shaped sealing plate; 24-driven circular plate; 25-leakage groove; 26-fixed circular plate; 27-drain valve; 28-lifting rod; 29-avoidance groove; 30-support pipe; 31-two-way telescopic cylinder; 32-fixed pipe; 33-lifting pipe; 34-thrust rod; 35- Conical plate; 36-built-in telescopic cylinder; 37-support cylinder; 38-external separation cylinder; 39-conical sleeve; 40-transition cylinder; 41-one-way rotating tube; 42-inner separation cylinder; 43-waste discharge trough; 44-lifting arc plate; 45-liquid discharge trough; 46-transition plate; 47-drive plate; 48-external cleaning plate; 49-filter plate; 50-connecting bracket; 51-inner cleaning plate; 52-rotating shaft; 53-one-way transmission assembly; 54-built-in motor; 55-upper limit cylinder; 56-electrically controlled telescopic cylinder; 57-lower limit cylinder; 58-drive rod; 59-filter hole; 60-transmission plate; 61-transition circular plate; 62-ratchet; 63-ratchet; 64-tension spring; 65-positioning rod; 66-threaded hole; 67-lower fixing plate; 68-limiting bolt; 69-upper fixing plate. DETAILED DESCRIPTION

[0048] The following embodiments of the technical solution of the present invention are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and are therefore only used as examples, and cannot be used to limit the protection scope of the present invention.

[0049] like Figures 1 to 10 As shown, a liquid separation kettle for producing diethyl malonate comprises a supporting base 1, two vertically fixed support plates 2 are horizontally arranged in parallel on the top of the supporting base 1, a liquid separation kettle body 3 with an opening on the top is vertically arranged between the two support plates 2, the liquid separation kettle body 3 is rotatably connected to the two support plates 2, a closing component 22 for controlling the opening and closing of the opening end of the liquid separation kettle body 3 is arranged inside the liquid separation kettle body 3, a liquid separation component 19 is arranged inside the liquid separation kettle body 3 at a position where the solution is layered, a solid-liquid separation mechanism 6 which can be connected to the opening end of the liquid separation kettle body 3 is arranged above the liquid separation kettle body 3, a constant pressure valve 21 and a drain valve 27 which are connected to the inner cavity of the liquid separation kettle body 3 are fixedly arranged at positions above and below the liquid separation component 19, and the constant pressure valve 21 and the drain valve 27 are evenly distributed along the circumferential direction;

[0050] The liquid separation component 19 includes two fixed rings 20 coaxially arranged with the liquid separation kettle body 3. The outer wall of the fixed ring 20 is fixedly connected to the inner wall of the liquid separation kettle body 3. The top and bottom of the fixed ring 20 are both inclined structures. The inclined ends of the two fixed rings 20 facing each other are both provided with sealing pads 18.

[0051] A fixed tube 32 is coaxially arranged at a position between the two fixing rings 20 inside the liquid separation kettle body 3, and the outer wall of the fixed tube 32 is sleeved with two vertically arranged lifting tubes 33, and the lifting tube 33 is vertically slidingly sealed and connected to the fixed tube 32, and the opposite ends of the two lifting tubes 33 extend to the outside of the fixed tube 32 in opposite directions, and are coaxially fixed with a conical plate 35, and the inner wall of the fixed tube 32 is uniformly distributed with two vertically fixed two-way telescopic cylinders 31 along the circumferential direction, and the two telescopic ends of the two-way telescopic cylinders 31 are fixedly connected to the two conical plates 35 through a push rod 34, and the outer wall of the fixed tube 32 is fixed with two horizontally penetrating support tubes 30, one of the ports of the support tube 30 penetrates the liquid separation kettle body 3 and is fixedly connected to the liquid separation kettle body 3, and the outer wall of the lifting tube 33 is provided with two avoidance grooves 29 matching the support tube 30;

[0052] The sealing assembly 22 includes a fixed circular plate 26 which is coaxial with the liquid separation kettle body 3 and fixedly connected to the inner wall thereof, a plurality of liquid leakage grooves 25 are uniformly distributed along the circumferential direction on the top of the fixed circular plate 26, and the liquid leakage grooves 25 are fan-shaped structures, a lifting rod 28 is coaxially penetrated through the top of the fixed circular plate 26 and is slidably connected thereto, a driven circular plate 24 is coaxially fixedly connected to the top of the lifting rod 28, and a plurality of fan-shaped sealing plates 23 are uniformly distributed along the circumferential direction on the bottom of the driven circular plate 24;

[0053] When the solid-liquid separation mechanism 6 is connected to the open end of the liquid separation kettle body 3, a quantitative reaction solution is added to the solid-liquid separation mechanism 6. When the reaction solution passes through the solid-liquid separation mechanism 6, the solid matter is separated from the solution. The solution after solid-liquid separation enters the liquid separation kettle body 3 for static separation. The device has both solid-liquid separation function and liquid separation function. After the reaction solution completes solid-liquid separation, it can be directly statically separated, which simplifies the post-processing process of the reaction solution.

[0054] During the static separation process of the solution in the liquid separation kettle body 3, the solid-liquid separation mechanism 6 is separated from the open end of the liquid separation kettle body 3, and the lifting rod 28 slides downward until the fan-shaped closing plate 23 closes the leakage groove 25. At this time, the open end of the liquid separation kettle body 3 is closed. After the solution in the liquid separation kettle body 3 completes the static separation, the position of the solution stratification is located between the two fixing rings 20, and the two-way telescopic cylinder 31 drives the two conical plates 35 to move relative to each other until the two conical plates 35 are both against the sealing gasket 18. At this time, the upper solution and the lower solution in the liquid separation kettle body 3 are completely separated, and the liquid separation kettle body 3 is rotated to a horizontal state, and the constant pressure valve 21 and the drain valve 27 are opened. The upper solution and the lower solution are simultaneously discharged to the outside through different drain valves 27 for collection. The constant pressure valve 21 can maintain a constant pressure environment inside the liquid separation kettle body 3, thereby ensuring that the speed of solution discharge is not affected by the gas inside the liquid separation kettle body 3. After the solution is discharged, the constant pressure valve 21 and the drain valve 27 are closed, and the liquid separation kettle body 3 is rotated to a vertical state. The two-way telescopic cylinder 31 drives the two conical plates 35 to move toward each other, and the solution between the two fixing rings 20 enters the bottom of the liquid separation kettle body 3. This part of the solution can be statically separated together with the solution that completes the solid-liquid separation later. Repeating the above operation can continuously perform solid-liquid separation and static separation on the solution. By adopting a method of sealing the solution at the stratification position and completely separating the upper solution from the lower solution at the same time, not only can the separated solution be quickly discharged to the outside of the liquid separation kettle body 3 through different drain valves 27 at the same time, the discharge speed of the solution after static separation is accelerated, and there will be no mixing during the solution discharge process. At the same time, the operation of collecting, transferring and re-adding the solution at the stratification position can be omitted, simplifying the discharge process of the solution after static separation.

[0055] The conical structures at the top and bottom of the fixing ring 20 and the conical plate 35 can effectively prevent the solution from accumulating during the static separation and movement process.

[0056] The solid-liquid separation mechanism 6 includes a vertically arranged outer separation cylinder 38, both ends of which are opened, a transition cylinder 40 with an open top is coaxially arranged above the outer separation cylinder 38, the top of the outer separation cylinder 38 extends upward through the transition cylinder 40 to the inside and is fixedly connected thereto, an inner separation cylinder 42 with openings at both ends is coaxially fixedly connected to the upper inner wall of the outer separation cylinder 38, the top of the inner separation cylinder 42 extends upward to the outside of the outer separation cylinder 38, a filter plate 49 is coaxially fixedly connected to the inner wall of the inner separation cylinder 42, and the top surface of the filter plate 49 is flush with the top surface of the outer separation cylinder 38.

[0057] The outer wall of the inner separation cylinder 42 is located outside the outer separation cylinder 38 and is uniformly distributed along the circumferential direction with a plurality of waste discharge grooves 43 that penetrate the inner separation cylinder 42 downward. A lifting arc plate 44 that controls its opening and closing is vertically slidable in the waste discharge groove 43. The inner wall and outer wall of the lifting arc plate 44 are in friction contact with the filter plate 49 and the outer separation cylinder 38 respectively. A rotating shaft 52 that is rotatably arranged is coaxially provided on the top of the filter plate 49. The outer wall of the rotating shaft 52 is uniformly distributed along the circumferential direction with a plurality of friction contacts with the filter plate 49. The inner cleaning plate 51 of the outer separation cylinder 38 is in a slanted structure. The outer wall of the outer separation cylinder 38 is located below the transition cylinder 40 and is fixedly sleeved with a conical sleeve 39. The top of the conical sleeve 39 is fixedly connected to the bottom of the transition cylinder 40. The outer wall of the outer separation cylinder 38 is located inside the conical sleeve 39 and is uniformly distributed along the circumferential direction with a plurality of drainage grooves 45 penetrating therethrough. The bottom of the transition cylinder 40 is located inside the conical sleeve 39 and the top of the filter plate 49 are both penetrated with a plurality of filter holes 59.

[0058] Two fixed brackets 16 are vertically fixed to the top of the support plate 2, a rotating plate 14 rotatably connected to the two fixed brackets 16 is provided between the two fixed brackets 16 on the top of one of the support plates 2, the outer separation cylinder 38 is fixedly connected to the rotating plate 14 through a connecting plate 15, and a rotating bracket 5 rotatably connected to the two fixed brackets 16 is provided between the two fixed brackets 16 on the top of the other support plate 2, the upper outer wall of the inner separation cylinder 42 is sleeved with a one-way rotating tube 41 rotatably connected thereto, the upper port of the one-way rotating tube 41 extends upward to the outside of the inner separation cylinder 42, one end of the rotating bracket 5 is fixedly connected to a sealing circular plate 8 for controlling the opening and closing of the upper port of the one-way rotating tube 41, and a liquid inlet valve 7 is fixedly provided through the top of the sealing circular plate 8;

[0059] When the reaction solution is subjected to solid-liquid separation, the rotating plate 14 rotates until the bottom of the outer separation cylinder 38 abuts against the top of the liquid separation kettle body 3, and then the outer separation cylinder 38 is connected with the liquid separation kettle body 3, and the rotating bracket 5 rotates until the bottom of the sealing circular plate 8 abuts against the top of the one-way rotating tube 41, and then the upper port of the one-way rotating tube 41 is closed, and a certain amount of reaction solution is discharged into the inner separation cylinder 42 through the liquid inlet valve 7. When the reaction solution passes through the filter plate 49, solid-liquid separation can be performed, and the solid matter is trapped on the top of the filter plate 49, and the solution enters the liquid separation kettle body 3 through the filter hole 59;

[0060] When a certain amount of solid matter accumulates on the surface of the filter plate 49, the lifting arc plate 44 slides downward until its top surface is flush with the top surface of the filter plate 49, and the rotating shaft 52 drives the internal cleaning plate 51 to rotate, thereby cleaning the solid matter accumulated on the surface of the filter plate 49, and the cleaned solid matter enters the transition tube 40 through the waste discharge groove 43. In the process of cleaning the filter plate 49, part of the solution passes through the filter plate 49 and then passes through the external separation tube 38 to enter the liquid separation kettle body 3, and the remaining reaction solution enters the transition tube 40 through the waste discharge groove 43, and after being filtered by the transition tube 40, it passes through the conical sleeve 39, the liquid discharge groove 45 and the external separation tube 38 in turn to enter the liquid separation kettle body 3, thereby realizing the function of automatically cleaning and collecting the solid matter accumulated on the surface of the filter plate 49 without stopping the solid-liquid separation of the reaction solution, so that the surface of the filter plate 49 always maintains less solid matter, thereby ensuring the solid-liquid separation speed of the reaction solution.

[0061] A rectangular groove 9 is provided on the top of the rotating plate 14 and is penetrated from left to right. A rotating plate 10 is provided in the rectangular groove 9. The opposite side walls of the rotating plate 10 are rotatably connected to the opposite inner walls of the rectangular groove 9. One end of the rotating plate 10 extends out of the rectangular groove 9 and is fixedly connected to a collecting cylinder 11 with openings at both ends. A closed circular plate 12 for controlling the opening and closing of the collecting cylinder 11 is hingedly connected to the lower end of the collecting cylinder 11.

[0062] The outer wall of the one-way rotating tube 41 is evenly distributed with two fixed connection brackets 50 along the circumferential direction. One end of the connection bracket 50 extends downward into the transition tube 40 and is fixedly connected with an outer cleaning plate 48 in frictional contact with the inner bottom of the transition tube 40. The opposite side walls of the outer cleaning plate 48 are in frictional contact with the transition tube 40 and the outer separation tube 38. The rotating shaft 52 is connected to the one-way rotating tube 41 through a one-way transmission assembly 53.

[0063] After the solid-liquid separation of the reaction solution is completed, the rotating bracket 5 rotates until the sealing circular plate 8 is separated from the one-way rotating tube 41, and the rotating plate 10 rotates until the upper port of the collecting tube 11 abuts against the open end of the transition tube 40. Then, the rotating plate 14 rotates until the open end of the transition tube 40 is downward, and the solid matter accumulated on the surface of the filter plate 49 and in the transition tube 40 falls into the collecting tube 11. The rotating shaft 52 rotates in the opposite direction. Under the drive of the one-way transmission component 53, the one-way rotating tube 41 rotates, thereby driving the connecting bracket 50 and the outer cleaning plate 48 to rotate, and the inner cleaning plate 51 and the outer cleaning plate 48 rotate. The cleaning plate 48 cleans the solid matter adhered to the surface of the filter plate 49 and the transition tube 40 respectively. The cleaned solid matter enters the collecting tube 11 for collection. After the cleaning is completed, the staff puts the collecting container under the collecting tube 11 and rotates the closed circular plate 12 to open the lower port of the collecting tube 11. The solid matter in the collecting tube 11 falls into the collecting container for unified collection, thereby realizing the function of automatically cleaning and collecting all solid matter generated in the solid-liquid separation process after the solid-liquid separation of the reaction solution is completed, thereby simplifying the cleaning process of the solid matter.

[0064] The one-way transmission assembly 53 includes a transition circular plate 61 rotatably mounted on the outer wall of the rotating shaft 52, a ratchet 62 is coaxially fixed to the top of the rotating shaft 52, two ratchet pawls 63 cooperating with the ratchet 62 are rotatably arranged on the top of the transition circular plate 61, two tension springs 64 are arranged above the transition circular plate 61, both ends of the tension spring 64 are connected to the ratchet pawls 63 and the transition circular plate 61 through positioning rods 65, and the transition circular plate 61 is connected to the one-way rotating tube 41 through two transmission plates 60;

[0065] When the rotating shaft 52 rotates forward, the ratchet 62 does not transmit the transmission to the pawl 63, and thus the rotating shaft 52 can only drive the inner cleaning plate 51 to rotate. When the rotating shaft 52 rotates reversely, the ratchet 62 transmits the transmission to the pawl 63, and thus drives the transition circular plate 61, the transmission plate 60 and the one-way rotating tube 41 to rotate, thereby driving the connecting bracket 50 and the outer cleaning plate 48 to rotate.

[0066] A support tube 37 with an open top is coaxially fixed to the bottom of the fixed circular plate 26 . A built-in telescopic cylinder 36 is fixed to the inner bottom of the support tube 37 . The telescopic end of the built-in telescopic cylinder 36 is fixedly connected to the lifting rod 28 .

[0067] An upper limit cylinder 55 with sealed ends is coaxially fixed to the bottom of the filter plate 49 , and a built-in motor 54 is arranged in the upper limit cylinder 55 . The bottom of the rotating shaft 52 passes through the filter plate 49 , and the output end of the built-in motor 54 passes through the upper limit cylinder 55 and is fixedly connected to the rotating shaft 52 .

[0068] The bottom of the upper limit cylinder 55 is coaxially fixed with a lower limit cylinder 57 with sealing ends, the bottom of the lower limit cylinder 57 is coaxially penetrated by a driving rod 58 that is slidably arranged, the bottom of the driving rod 58 is fixedly connected with a driving plate 47, and a plurality of lifting arc plates 44 are fixedly connected to the driving plate 47 through a transition plate 46. An electric-controlled telescopic cylinder 56 is fixedly provided on the inner top of the lower limit cylinder 57, and the telescopic end of the electric-controlled telescopic cylinder 56 is fixedly connected to the driving rod 58.

[0069] The ends of the two fixed brackets 16 located on the top of different support plates 2 are fixed with rotation control motors 4. The output ends of the two rotation control motors 4 pass through the two fixed brackets 16 respectively and are fixedly connected to the rotating bracket 5 and the rotating plate 14 accordingly.

[0070] A rotation control motor 13 is fixedly provided at the end of the rotating plate 14 , and an output end of the rotation control motor 13 passes through the rotating plate 14 and is fixedly connected to the rotating plate 10 .

[0071] A rotary drive motor 17 is fixedly provided at the end of one of the support plates 2 , and an output end of the rotary drive motor 17 passes through the support plate 2 and is fixedly connected to the liquid separation kettle body 3 .

[0072] An upper fixing plate 69 is vertically fixed to the outer wall of the collecting tube 11, and a limiting bolt 68 threadedly connected to the upper fixing plate 69 is penetrated at the end thereof; a lower fixing plate 67 is vertically fixed to the side wall of the closed circular plate 12, and a threaded hole 66 matching the limiting bolt 68 is penetrated at the end thereof;

[0073] When the lower port of the collecting cylinder 11 is closed by the closing circular plate 12, the closing circular plate 12 is rotated until its top abuts against the lower port of the collecting cylinder 11, and the limiting bolt 68 is screwed into the threaded hole 66 of the lower fixing plate 67. At this time, the lower port of the collecting cylinder 11 is closed by the closing circular plate 12.

[0074] The working principle of this device is:

[0075] When the reaction solution is subjected to solid-liquid separation, one of the rotary control motors 4 drives the rotary plate 14 to rotate until the lower port of the outer separation cylinder 38 abuts against the upper port of the liquid separation kettle body 3, and the outer separation cylinder 38 is connected to the liquid separation kettle body 3, and the other rotary control motor 4 drives the rotary bracket 5 to rotate until the bottom of the sealing circular plate 8 abuts against the top of the one-way rotating tube 41, thereby sealing the upper port of the one-way rotating tube 41, and discharging a certain amount of reaction solution into the inner separation cylinder 42 through the liquid inlet valve 7. The reaction solution can be subjected to solid-liquid separation when passing through the filter plate 49, and the solid matter is trapped on the top of the filter plate 49. The solution enters the liquid separation kettle body 3 through the filter hole 59. After the reaction solution completes the solid-liquid separation, it can be directly subjected to static separation in the liquid separation kettle body 3. The device has both solid-liquid separation and liquid separation functions. After the reaction solution completes the solid-liquid separation, it can be directly subjected to static separation, thereby simplifying the post-processing process of the reaction solution.

[0076] During the solid-liquid separation process of the reaction solution, when a certain amount of solid matter accumulates on the top of the filter plate 49, the electrically controlled telescopic cylinder 56 drives the driving rod 58 and the driving plate 47 to move downward. With the cooperation of the transition plate 46, the lifting arc plate 44 slides downward until the top surface of the lifting arc plate 44 is flush with the top surface of the filter plate 49. The built-in motor 54 drives the rotating shaft 52 and the inner cleaning plate 51 to rotate forward. At this time, the ratchet 62 does not drive the pawl 63, and the rotating inner cleaning plate 51 cleans the solid matter accumulated on the surface of the filter plate 49. The cleaned solid matter enters the transition cylinder 40 through the waste discharge trough 43. During the cleaning process of the filter plate 49, part of the solution passes through the filter plate 49 and then enters the liquid separation kettle body 3 through the external separation cylinder 38, and the remaining reaction solution enters the transition cylinder 40 through the waste discharge tank 43, and then passes through the tapered sleeve 39, the liquid discharge tank 45 and the external separation cylinder 38 in sequence after being filtered by the transition cylinder 40 to enter the liquid separation kettle body 3, realizing the function of automatically cleaning and collecting the solid matter accumulated on the surface of the filter plate 49 without stopping the solid-liquid separation of the reaction solution, so that the surface of the filter plate 49 always maintains less solid matter, ensuring the solid-liquid separation speed of the reaction solution;

[0077] After the quantitative reaction solution completes the solid-liquid separation, the built-in telescopic cylinder 36 drives the lifting rod 28, the driven circular plate 24 and the plurality of fan-shaped sealing plates 23 to move downward until the fan-shaped sealing plate 23 closes the leakage groove 25. One of the rotation control motors 4 drives the rotating bracket 5 to rotate until the bottom of the sealing circular plate 8 is separated from the one-way rotating tube 41. The rotation control motor 13 drives the rotating plate 10 and the collecting tube 11 to rotate until the upper port of the collecting tube 11 abuts against the open end of the transition tube 40. Another rotation control motor 4 drives the rotating plate 14 to rotate until the open end of the transition tube 40 is downward, and the solid matter accumulated on the surface of the filter plate 49 and in the transition tube 40 falls into the collecting tube 11. The built-in motor 54 drives the rotating shaft 52 and the inner cleaning plate 51 to rotate in the opposite direction. At this time, the ratchet 62 drives the pawl 63. Then, the transition circular plate 61, the transmission plate 60 and the one-way rotating tube 41 are driven to rotate, thereby driving the connecting bracket 50 and the outer cleaning plate 48 to rotate, and the inner cleaning plate 51 and the outer cleaning plate 48 respectively clean the solid matter adhered to the surface of the filter plate 49 and the inside of the transition tube 40, and the cleaned solid matter enters the collecting tube 11 for collection. After the cleaning is completed, the staff puts the collecting container under the collecting tube 11, and rotates the limit bolt 68 to separate it from the lower fixing plate 67, and rotates the closed circular plate 12 downward, so that the lower port of the collecting tube 11 is opened, and the solid matter in the collecting tube 11 falls into the collecting container for unified collection, realizing the function of automatically cleaning and collecting all the solid matter generated in the solid-liquid separation process after the solid-liquid separation of the reaction solution is completed, thereby simplifying the cleaning process of the solid matter;

[0078] After the solution in the liquid separation kettle body 3 completes static separation, the position of the solution stratification is located between the two fixed rings 20, and the two-way telescopic cylinder 31 drives the two conical plates 35 to move relative to each other until the two conical plates 35 are against the sealing gasket 18. At this time, the upper solution and the lower solution in the liquid separation kettle body 3 are completely separated, and the rotary drive motor 17 drives the liquid separation kettle body 3 to rotate to a horizontal state, and the constant pressure valve 21 and the drain valve 27 are opened. The upper solution and the lower solution are discharged to the outside through different drain valves 27 at the same time for collection. After the solution is discharged, the constant pressure valve 21 and the drain valve 27 are closed, and the rotary drive motor 17 drives the liquid separation kettle body 3 to rotate to a vertical state, and the two-way telescopic cylinder 31 drives the two conical plates 35 to move relative to each other. Move, the solution between the two fixed rings 20 enters the bottom of the separator body 3, and this part of the solution can be statically separated together with the solution that completes solid-liquid separation later. Repeating the above operation can continuously perform solid-liquid separation and static separation on the solution. By adopting the method of sealing the solution at the stratification position and completely separating the upper solution from the lower solution at the same time, not only can the separated solution be quickly discharged to the outside of the separator body 3 through different drain valves 27 at the same time, the discharge speed of the solution after static separation is accelerated, and there will be no mixing during the solution discharge process. At the same time, the operations of collecting, transferring and re-adding the solution at the stratification position can be omitted, simplifying the discharge process of the solution after static separation.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. These modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be included in the scope of the claims and specification of the present invention.

Claims

1. A liquid separator for producing diethyl malonate, characterized in that: The invention comprises a support base (1), wherein two support plates (2) are arranged horizontally and vertically fixedly on the top of the support base (1), a liquid separation kettle body (3) with an opening on the top is arranged vertically between the two support plates (2), the liquid separation kettle body (3) is rotatably connected to the two support plates (2), a sealing component (22) for controlling the opening and closing of the open end of the liquid separation kettle body (3) is arranged inside the liquid separation kettle body (3), a liquid separation component (19) is arranged inside the liquid separation kettle body (3) at a position where the solution is layered, and the liquid separation kettle body (3) is provided with a sealing component (22) for controlling the opening and closing of the open end of the liquid separation kettle body (3). A solid-liquid separation mechanism (6) is provided above the liquid separation kettle body (3) and is connected to the open end thereof; a constant pressure valve (21) and a drain valve (27) are fixedly provided at positions above and below the liquid separation assembly (19) on the outer wall of the liquid separation kettle body (3) and are connected to the inner cavity thereof; the constant pressure valve (21) and the drain valve (27) are evenly arranged along the circumferential direction; a rotary drive motor (17) is fixedly provided at the end of one of the support plates (2); an output end of the rotary drive motor (17) passes through the support plate (2) and is fixedly connected to the liquid separation kettle body (3); The liquid separation component (19) comprises two fixing rings (20) coaxially arranged with the liquid separation kettle body (3); the outer wall of the fixing ring (20) is fixedly connected to the inner wall of the liquid separation kettle body (3); the top and bottom of the fixing ring (20) are both inclined structures; the facing inclined ends of the two fixing rings (20) are both provided with sealing pads (18); A fixed tube (32) is coaxially arranged in a position between the two fixing rings (20) inside the liquid separation kettle body (3), and the outer wall of the fixed tube (32) is sleeved with two vertically arranged lifting tubes (33). The lifting tubes (33) are vertically slidably sealed and connected to the fixed tube (32). The opposite ends of the two lifting tubes (33) extend to the outside of the fixed tube (32) in opposite directions and are coaxially fixed with a conical plate (35). The inner wall of the fixed tube (32) is uniformly distributed along the circumference. a vertically fixed bidirectional telescopic cylinder (31), the two telescopic ends of the bidirectional telescopic cylinder (31) being fixedly connected to the two conical plates (35) via a push rod (34), the outer wall of the fixed tube (32) being fixedly provided with two horizontally penetrating support tubes (30), one of the ports of the support tube (30) penetrating the liquid separation kettle body (3) and being fixedly connected to the liquid separation kettle body (3), and the outer wall of the lifting tube (33) being provided with two avoidance grooves (29) matching the support tubes (30); The sealing component (22) comprises a fixed circular plate (26) coaxial with the liquid separation kettle body (3) and fixedly connected to the inner wall thereof, a plurality of liquid leakage grooves (25) are uniformly distributed along the circumferential direction on the top of the fixed circular plate (26), the liquid leakage grooves (25) are of a fan-shaped structure, a lifting rod (28) is coaxially penetrated through the top of the fixed circular plate (26) and is slidably connected thereto, a driven circular plate (24) is coaxially fixedly connected to the top of the lifting rod (28), and a plurality of fan-shaped sealing plates (23) are uniformly distributed along the circumferential direction on the bottom of the driven circular plate (24); The solid-liquid separation mechanism (6) comprises an outer separation cylinder (38) arranged vertically, both ends of the outer separation cylinder (38) are opened, a transition cylinder (40) with an open top is coaxially arranged above the outer separation cylinder (38), the top of the outer separation cylinder (38) extends upward through the transition cylinder (40) to the inside and is fixedly connected thereto, an inner separation cylinder (42) with open ends is coaxially fixedly connected to the upper inner wall of the outer separation cylinder (38), the top of the inner separation cylinder (42) extends upward to the outside of the outer separation cylinder (38), a filter plate (49) is coaxially fixedly connected to the inner wall of the inner separation cylinder (42), and the top surface of the filter plate (49) is flush with the top surface of the outer separation cylinder (38). The outer wall of the inner separation cylinder (42) is located outside the outer separation cylinder (38) and is evenly distributed along the circumferential direction with a plurality of waste discharge grooves (43) extending through the inner separation cylinder (42) downwardly. A lifting arc plate (44) is vertically slidably provided in the waste discharge groove (43) for controlling its opening and closing. The inner wall and outer wall of the lifting arc plate (44) are in frictional contact with the filter plate (49) and the outer separation cylinder (38) respectively. A rotating shaft (52) is coaxially provided on the top of the filter plate (49) for rotation. The outer wall of the rotating shaft (52) is evenly distributed along the circumferential direction with a plurality of screws that are connected to the filter plate (49). The outer cleaning plate (51) is in frictional contact with the outer separation cylinder (38), the top surface of the outer separation cylinder (38) is an inclined structure, the outer wall of the outer separation cylinder (38) is fixedly sleeved with a conical sleeve (39) at a position below the transition cylinder (40), the top of the conical sleeve (39) is fixedly connected to the bottom of the transition cylinder (40), the outer wall of the outer separation cylinder (38) is located inside the conical sleeve (39) and is uniformly distributed along the circumferential direction with a plurality of drainage grooves (45) extending therethrough, the bottom of the transition cylinder (40) is located inside the conical sleeve (39) and the top of the filter plate (49) are both provided with a plurality of filter holes (59), Two fixed brackets (16) are vertically fixedly connected to the top of each support plate (2), wherein a rotating plate (14) rotatably connected to the two fixed brackets (16) is provided between the two fixed brackets (16) on the top of one of the support plates (2), and the outer separation cylinder (38) is fixedly connected to the rotating plate (14) via a connecting plate (15), and a rotating bracket (5) rotatably connected to the two fixed brackets (16) is provided between the two fixed brackets (16) on the top of the other support plate (2), and the upper outer wall of the inner separation cylinder (42) is sleeved with a one-way rotating tube (41) rotatably connected thereto, and the upper port of the one-way rotating tube (41) extends upward to the outside of the inner separation cylinder (42), and one end of the rotating bracket (5) is fixedly connected to a sealing circular plate (8) for controlling the opening and closing of the upper port of the one-way rotating tube (41), and a liquid inlet valve (7) is fixedly provided on the top of the sealing circular plate (8); A rectangular groove (9) is provided on the top of the rotating plate (14) and is penetrated from left to right. A rotating plate (10) is provided in the rectangular groove (9). The opposite side walls of the rotating plate (10) are rotatably connected to the opposite inner walls of the rectangular groove (9). One end of the rotating plate (10) extends outside the rectangular groove (9) and is fixedly connected to a collecting cylinder (11) with openings at both ends. A closed circular plate (12) for controlling the opening and closing of the collecting cylinder (11) is hingedly connected to the lower end of the collecting cylinder (11). The outer wall of the one-way rotating tube (41) is evenly distributed with two fixed connection brackets (50) along the circumferential direction, one end of the connection bracket (50) extends downward into the transition tube (40) and is fixedly connected with an outer cleaning plate (48) in frictional contact with the inner bottom of the transition tube (40), and the opposite side walls of the outer cleaning plate (48) are in frictional contact with the transition tube (40) and the outer separation tube (38), and the rotating shaft (52) is connected to the one-way rotating tube (41) via a one-way transmission assembly (53); The one-way transmission assembly (53) comprises a transition circular plate (61) rotatably mounted on the outer wall of the rotating shaft (52); a ratchet wheel (62) is coaxially fixedly connected to the top of the rotating shaft (52); two ratchet pawls (63) cooperating with the ratchet wheels (62) are rotatably arranged on the top of the transition circular plate (61); two tension springs (64) are arranged above the transition circular plate (61); both ends of the tension springs (64) are connected to the ratchet pawls (63) and the transition circular plate (61) via positioning rods (65); and the transition circular plate (61) is connected to the one-way rotating tube (41) via two transmission plates (60); A rotation control motor (13) is fixedly provided at the end of the rotating plate (14); the output end of the rotation control motor (13) passes through the rotating plate (14) and is fixedly connected to the rotating plate (10); An upper fixing plate (69) is vertically fixed to the outer wall of the collecting cylinder (11), and a limiting bolt (68) threadedly connected to the upper fixing plate (69) is penetrated at the end of the upper fixing plate (69). A lower fixing plate (67) is vertically fixed to the side wall of the closed circular plate (12), and a threaded hole (66) matching the limiting bolt (68) is penetrated at the end of the lower fixing plate (67).

2. A liquid separator for producing diethyl malonate according to claim 1, characterized in that: A support tube (37) with an opening at the top is coaxially fixedly connected to the bottom of the fixed circular plate (26), a built-in telescopic cylinder (36) is fixedly provided at the inner bottom of the support tube (37), and a telescopic end of the built-in telescopic cylinder (36) is fixedly connected to the lifting rod (28).

3. A liquid separator for producing diethyl malonate according to claim 1, characterized in that: An upper limit cylinder (55) having sealing ends is coaxially fixedly connected to the bottom of the filter plate (49), a built-in motor (54) is arranged in the upper limit cylinder (55), the bottom of the rotating shaft (52) passes through the filter plate (49), and the output end of the built-in motor (54) passes through the upper limit cylinder (55) and is fixedly connected to the rotating shaft (52).

4. A liquid separation kettle for producing diethyl malonate according to claim 3, characterized in that: The bottom of the upper limit cylinder (55) is coaxially fixedly connected with a lower limit cylinder (57) with sealing ends. The bottom of the lower limit cylinder (57) is coaxially penetrated by a slidable driving rod (58). The bottom of the driving rod (58) is fixedly connected with a driving plate (47). The plurality of lifting arc plates (44) are fixedly connected to the driving plate (47) via a transition plate (46). An electric-controlled telescopic cylinder (56) is fixedly provided on the inner top of the lower limit cylinder (57). The telescopic end of the electric-controlled telescopic cylinder (56) is fixedly connected to the driving rod (58).

5. A liquid separator for producing diethyl malonate according to claim 1, characterized in that: The ends of the two fixed brackets (16) located at the top of different support plates (2) are both fixedly provided with a rotation control motor (4), and the output ends of the two rotation control motors (4) respectively pass through the two fixed brackets (16) and are fixedly connected to the rotation bracket (5) and the rotation plate (14) respectively.

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