Evaporator for producing high-purity low-glycerol molecular distilled monoglyceride

Abstract

The present invention discloses an evaporator for producing high-purity low-glycerol molecular distilled monoglyceride, which relates to the technical field of monoglyceride processing. It includes a reaction kettle, a kettle cover arranged at the top of the reaction kettle, a stirring shaft rotatably arranged in the reaction kettle, and a sliding sleeve slidably arranged on the surface of the stirring shaft up and down. A plurality of paddle blades are evenly arranged on the surface of the sliding sleeve from top to bottom. A motor for driving the stirring shaft is arranged at the top of the kettle cover. An air supply mechanism is arranged at the bottom end of the sliding sleeve. A gas supply component matched with the air supply mechanism is arranged on the inner wall of the kettle cover. An arc-shaped feeding hopper is arranged below the air supply mechanism. In the invention, nitrogen gas in the upper layer is introduced into the lower part of the reaction kettle through the gas supply component and the air supply mechanism, and at the same time, the arc-shaped feeding hopper is driven to move up and down synchronously, so that the reactants in the lower part of the reaction kettle contact and react with the reactants in the upper part. At the same time, the paddle blades are driven to swing, so that the paddle blades rotate circumferentially and swing at the same time, thereby improving the reaction efficiency of the reactants.

Description

Technical Field

[0001] The present invention relates to the technical field of monoglyceride processing, and particularly to an evaporator for producing high-purity low-glycerol molecular distillation monoglyceride. Background Art

[0002] Monoglyceride, glycerol monostearate and distearate, with a molecular weight of 358.56 and a molecular formula of C21H42O4; it is a white or light yellow waxy solid, odorless, tasteless, soluble in hot organic solvents such as ethanol, benzene, acetone, mineral oil, and fatty oil, insoluble in water, but can be dispersed in hot water to form an emulsion under strong stirring.

[0003] Most of the existing monoglycerides are directly obtained by esterifying stearic acid with glycerol, then adding phosphoric acid for neutralization, stirring and cooling, and after standing, the system is stratified. The upper layer is the crude monoglyceride layer, and the lower layer is the incompletely reacted materials and impurities generated during the reaction process. After discharging the lower layer as slag, the remaining liquid is the crude monoglyceride; further, it is purified by an evaporator and a molecular distiller. In actual use, it is found that during the esterification, most of the reactions are directly stirred and mixed circumferentially by a stirring paddle, resulting in a low esterification reaction efficiency. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the prior art and propose an evaporator for producing high-purity low-glycerol molecular distillation monoglyceride.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An evaporator for producing high-purity low-glycerol molecular distillation monoglyceride, including a reaction kettle, a kettle cover arranged at the top of the reaction kettle, a stirring shaft rotatably arranged in the reaction kettle, and a sliding sleeve slidably arranged on the surface of the stirring shaft. A plurality of paddle blades are evenly arranged on the surface of the sliding sleeve from top to bottom. A motor for driving the stirring shaft is arranged at the top of the kettle cover. An air supply mechanism is arranged at the bottom end of the sliding sleeve. A gas supply component cooperating with the air supply mechanism is arranged on the inner wall of the kettle cover. An arc-shaped material pushing hopper is arranged below the air supply mechanism;

[0007] The air supply mechanism includes an air plate installed at the bottom end of the sliding sleeve. The opening of the arc-shaped material pushing hopper faces upward. A connecting column is arranged in the middle of the arc-shaped material pushing hopper. The top end of the connecting column extends out of the top end of the arc-shaped material pushing hopper and is connected to the bottom end of the air plate. A plurality of material passing ports are arranged on the surface of the arc-shaped material pushing hopper;

[0008] The plurality of material passing ports are a first material port group and a second material port group. The second material port group is arranged staggered with the first material port group. Among them, a first conical opening is arranged at the bottom end of the first material port group, and the larger-diameter end of the first conical opening faces downward. A second conical opening is arranged at the top end of the second material port group, and the larger-diameter end of the second conical opening faces upward.

[0009] As a further description of the above technical solution:

[0010] A gas cavity is provided in the middle of the gas plate. A plurality of air holes are provided at the upper right end and the lower left end of the gas plate. Air outlet one-way valves are embedded in the air holes. The middle of the gas plate is communicated with a guide pipe. The top of the guide pipe penetrates through the bottom end of the sliding sleeve and is connected to the lower part of the stirring shaft. The middle of the stirring shaft is a cavity, and the cavity is communicated with the guide pipe. A first piston rod is slidably connected up and down in the lower part of the cavity. The bottom end of the first piston rod penetrates through the bottom end of the stirring shaft and is connected to the inner wall of the bottom end of the sliding sleeve. A return spring is arranged between the bottom end of the stirring shaft and the inner wall of the sliding sleeve.

[0011] As a further description of the above technical solution:

[0012] The air supply assembly includes a cam arranged on the upper part of the stirring shaft and a second piston rod located on the right side of the cam. The second piston rod is slidably arranged left and right in the air storage tank. The air storage tank is fixedly connected to the inner wall of the kettle cover through a first mounting plate. An air inlet is provided at the lower right end of the air storage tank, and an air inlet one-way valve is embedded in the air inlet. An air outlet is provided at the upper right end of the air storage tank. An air outlet pipe communicated with the air outlet is arranged at the upper right end of the air storage tank. The air outlet pipe is communicated with the inside of the air passing cover. The air passing cover is rotatably connected to the upper surface of the stirring shaft through a sealed bearing. An air passing port communicated with the inner wall of the air passing cover is provided on the upper part of the stirring shaft. The surface of the air passing cover is fixedly connected to the inner wall of the kettle cover through a second mounting plate.

[0013] As a further description of the above technical solution:

[0014] One end of the second piston rod away from the air storage tank is fixedly connected with a sliding ball. An annular sliding groove for the sliding ball to slide is provided on the circumferential surface of the cam. A limiting ring for preventing the sliding ball from sliding out of the annular sliding groove is detachably installed on the surface of the cam.

[0015] As a further description of the above technical solution:

[0016] A strip-shaped guide block is arranged on the surface of the stirring shaft. A guide groove slidably matched with the strip-shaped guide block is provided on the inner wall of the sliding sleeve. The top end of the guide groove is a through groove.

[0017] As a further description of the above technical solution:

[0018] An upper support plate is installed on the upper surface of the stirring shaft. The upper support plate is located below the cam. Side scraping plates are installed at both the left and right ends of the upper support plate. The two side scraping plates are in contact with the inner wall of the reaction kettle, and the side scraping plates are arranged parallel to the stirring shaft. The bottom ends of the two side scraping plates are installed with the top end of a connecting plate. A through hole for the sliding sleeve to slide up and down is provided in the middle of the connecting plate. An arc-shaped scraping plate in contact with the inner wall of the bottom of the reaction kettle is arranged at the bottom end of the connecting plate.

[0019] As a further description of the above technical solution:

[0020] The paddle includes a mounting seat arranged on the surface of the stirring shaft and two hinge sleeves rotatably mounted at the left and right ends of the mounting seat. A main paddle is slidably arranged left and right at one end of the two hinge sleeves facing away from each other. A plurality of extension plates are installed at the upper and lower ends of the main paddle. A sub-paddle is arranged at one end of each of the plurality of extension plates away from the main paddle. A gap is left between adjacent sub-paddles. The plurality of sub-paddles are arranged parallel to the main paddle. The middle of the main paddle is rotatably connected to the side support plate through a rotating rod. The tops of the two side support plates are connected to the upper support plate, and the bottoms are connected to the top of the connecting plate.

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

[0022] In the present invention, nitrogen gas in the upper layer is introduced into the lower part of the reaction kettle through the air supply assembly and the ventilation mechanism, and the arc-shaped feeding hopper is synchronously driven to move up and down, so that the reactants in the lower part of the reaction kettle contact and react with the reactants in the upper part. At the same time, the paddle is driven to swing, so that the paddle rotates circumferentially and swings at the same time, thereby improving the reaction efficiency of the reactants. Description of the drawings

[0023] Figure 1 It is a schematic diagram of the overall structure of the evaporator for producing high-purity low-glycerol molecular distillation monoglyceride proposed by the present invention;

[0024] Figure 2 For Figure 1 The motion state diagram of;

[0025] Figure 3 It is a schematic diagram of the structure of the ventilation mechanism in the evaporator for producing high-purity low-glycerol molecular distillation monoglyceride proposed by the present invention;

[0026] Figure 4 For Figure 3 The motion state diagram of;

[0027] Figure 5 It is a schematic diagram of the structure of the arc-shaped feeding hopper in the evaporator for producing high-purity low-glycerol molecular distillation monoglyceride proposed by the present invention;

[0028] Figure 6 It is a schematic diagram of the structure of the air supply assembly in the evaporator for producing high-purity low-glycerol molecular distillation monoglyceride proposed by the present invention;

[0029] Figure 7 It is a schematic diagram of the structure of the cam and the second piston rod in the evaporator for producing high-purity low-glycerol molecular distillation monoglyceride proposed by the present invention;

[0030] Figure 8Schematic structural diagram of the paddle in the evaporator for producing high-purity low-glycerol molecular distilled monoglyceride proposed by the present invention;

[0031] Figure 9 For Figure 8 motion state diagram.

[0032] In the figure: 1, reaction kettle; 2, kettle cover; 3, stirring shaft; 4, sliding sleeve; 5, paddle; 51, mounting seat; 52, hinge sleeve; 53, main paddle; 54, extension plate; 55, auxiliary paddle; 6, upper support plate; 7, side scraper; 8, connecting plate; 9, arc-shaped scraper; 10, side support plate; 11, ventilation mechanism; 111, air plate; 112, exhaust port; 113, air guide pipe; 114, first piston rod; 12, air supply assembly; 121, cam; 1211, limit ring; 122, second piston rod; 1221, sliding ball; 123, air storage tank; 124, first mounting plate; 125, air passing hood; 126, second mounting plate; 13, arc-shaped feeding hopper; 131, connecting column; 132, first material port group; 133, second material port group. Embodiment

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0034] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0035] Refer to Figures 1-5 , an evaporator for producing high-purity low-glycerol molecular distilled monoglyceride, including a reaction kettle 1, a kettle cover 2 provided at the top end of the reaction kettle 1, a stirring shaft 3 rotatably provided in the reaction kettle 1, and a sliding sleeve 4 slidably provided on the surface of the stirring shaft 3. A plurality of paddles 5 are uniformly provided on the surface of the sliding sleeve 4 from top to bottom. A motor for driving the stirring shaft 3 is provided at the top end of the kettle cover 2. A ventilation mechanism 11 is provided at the bottom end of the sliding sleeve 4. An air supply assembly 12 cooperating with the ventilation mechanism 11 is provided on the inner wall of the kettle cover 2. An arc-shaped feeding hopper 13 is provided below the ventilation mechanism 11;

[0036] Refer to Figures 3-5, the ventilation mechanism 11 includes an air plate 111 installed at the bottom end of the sliding sleeve 4. The opening of the arc-shaped feeding hopper 13 faces upward. A connecting column 131 is arranged in the middle of the arc-shaped feeding hopper 13. The top end of the connecting column 131 extends out of the top end of the arc-shaped feeding hopper 13 and is connected to the bottom end of the air plate 111. A plurality of material passing ports are formed on the surface of the arc-shaped feeding hopper 13;

[0037] Refer to Figure 5 , the plurality of material passing ports are a first material port group 132 and a second material port group 133. The second material port group 133 is arranged staggeredly with the first material port group 132. Among them, a first conical port is formed at the bottom end of the first material port group 132, and the end with a larger aperture of the first conical port faces downward. A second conical port is formed at the top end of the second material port group 133, and the end with a larger aperture of the second conical port faces upward.

[0038] Refer to Figures 3-4 , an air cavity is formed in the middle of the air plate 111. A plurality of air holes are formed at the upper right end and the lower left end of the air plate 111. An air outlet one-way valve is embedded in each air hole. The middle of the air plate 111 is communicated with a guide air pipe 113. The top end of the guide air pipe 113 penetrates through the bottom end of the sliding sleeve 4 and is connected to the lower part of the stirring shaft 3. The middle part of the stirring shaft 3 is a cavity, and the cavity is communicated with the guide air pipe 113. A first piston rod 114 is slidably connected up and down in the lower part of the cavity. The bottom end of the first piston rod 114 penetrates through the bottom end of the stirring shaft 3 and is connected to the inner wall of the bottom end of the sliding sleeve 4. A return spring is arranged between the bottom end of the stirring shaft 3 and the inner wall of the sliding sleeve 4;

[0039] Refer to Figure 6 , the air supply assembly 12 includes a cam 121 arranged on the upper part of the stirring shaft 3 and a second piston rod 122 located on the right side of the cam 121. The second piston rod 122 is slidably arranged left and right in the air storage tank 123. The air storage tank 123 is fixedly connected to the inner wall of the kettle cover 2 through a first mounting plate 124. An air inlet is formed at the lower right end of the air storage tank 123, and an air inlet one-way valve is embedded in the air inlet. An air outlet is formed at the upper right end of the air storage tank 123. An air outlet pipe communicated with the air outlet is arranged at the upper right end of the air storage tank 123. The air outlet pipe is internally communicated with the inside of the air passing cover 125. The air passing cover 125 is rotatably connected to the surface of the upper part of the stirring shaft 3 through a sealing bearing. An air passing port communicated with the inner wall of the air passing cover 125 is formed in the upper part of the stirring shaft 3. The surface of the air passing cover 125 is fixedly connected to the inner wall of the kettle cover 2 through a second mounting plate 126;

[0040] Refer to Figure 7 , one end of the second piston rod 122 away from the air storage tank 123 is fixedly connected with a sliding ball 1221. An annular sliding groove for the sliding ball 1221 to slide is formed on the circumferential surface of the cam 121. A limiting ring 1211 for preventing the sliding ball 1221 from sliding out of the annular sliding groove is detachably installed on the surface of the cam 121;

[0041] Refer to Figure 1, a strip-shaped guide block is provided on the surface of the stirring shaft 3, a guide groove slidably matched with the strip-shaped guide block is opened on the inner wall of the sliding sleeve 4, and the top end of the guide groove is a through groove.

[0042] Refer to Figures 1-2 , an upper support plate 6 is installed on the upper surface of the stirring shaft 3. The upper support plate 6 is located below the cam 121. Side scraping plates 7 are installed at both the left and right ends of the upper support plate 6. The two side scraping plates 7 are in contact with the inner wall of the reaction kettle 1, and the side scraping plates 7 are arranged parallel to the stirring shaft 3. The bottom ends of the two side scraping plates 7 are installed with the top end of the connecting plate 8. A through hole for the up-and-down sliding of the sliding sleeve 4 is opened in the middle of the connecting plate 8. An arc-shaped scraping plate 9 in contact with the bottom inner wall of the reaction kettle 1 is arranged at the bottom end of the connecting plate 8.

[0043] Refer to Figures 8-9 , the paddle 5 includes a mounting seat 51 arranged on the surface of the stirring shaft 3 and two hinge sleeves 52 rotatably mounted at both the left and right ends of the mounting seat 51. The main paddle 53 is slidably arranged left and right at one end of the two hinge sleeves 52 facing away from each other. A plurality of extension plates 54 are installed at both the upper and lower ends of the main paddle 53. A secondary paddle 55 is arranged at one end of each of the plurality of extension plates 54 away from the main paddle 53. A gap is left between adjacent secondary paddles 55. The plurality of secondary paddles 55 are arranged parallel to the main paddle 53. The middle of the main paddle 53 is rotationally connected to the side support plate 10 through a rotating rod. The top ends of the two side support plates 10 are connected to the upper support plate 6, and the bottom ends are connected to the top end of the connecting plate 8.

[0044] Working principle: When in use, stearic acid and glycerol are placed in the reaction kettle 1 together according to a molar ratio of 1:8, a catalyst is added for transesterification reaction, and nitrogen is filled as a protective gas. During the reaction process, the motor is started, which drives the stirring shaft 3 to rotate, and then drives the paddle 5 to rotate circumferentially to mix the reactants in the reaction kettle 1; among them, the stirring shaft 3 drives the two side scraping plates 7 to scrape the inner wall of the reaction kettle 1 through the upper support plate 6, and then drives the connecting plate 8 to rotate, so that the arc-shaped scraping plate 9 at the bottom end of the connecting plate 8 scrapes the inner wall of the bottom end of the reaction kettle 1, avoiding adhesion on the inner wall of the reaction kettle 1 and accelerating the transesterification reaction of the reactants in the reaction kettle 1; among them, the stirring shaft 3 drives the sliding sleeve 4 to rotate, and then drives the arc-shaped feeding hopper 13 to rotate circumferentially to mix the reactants in the reaction kettle 1;

[0045] Among them, during the rotation of the stirring shaft 3, the cam 121 will be driven to rotate. When the convex part of the cam 121 moves away from the air storage tank 123, the second piston rod 122 will be driven to move leftward in the air storage tank 123, and then nitrogen will be drawn into the air storage tank 123 through the air inlet. When the convex part of the cam 121 approaches the air storage tank 123, the second piston rod 122 will be driven to move rightward in the air storage tank 123, and then the nitrogen in the air storage tank 123 will be compressed, and then the nitrogen will be introduced into the air passing hood 125 through the air outlet pipe. Then, the nitrogen in the air passing hood 125 will enter the cavity of the stirring shaft 3 through the air passing port. Then, the nitrogen in the cavity will push the first piston rod 114 downward, and then the sliding sleeve 4 will move downward, stretching the return spring. As the first piston rod 114 continues to move downward, when the top end of the first piston rod 114 is located below the air guide pipe 113, the nitrogen in the cavity will enter the air plate 111 and then be discharged from the multiple exhaust ports 112 to contact the reactants at the lower part of the reaction kettle 1. After the nitrogen in the cavity is discharged, the return spring will drive the sliding sleeve 4 to move upward, so that the top end of the first piston rod 114 crosses the top end of the air guide pipe 113, facilitating the cavity to store gas again;

[0046] Among them, during the downward movement of the sliding sleeve 4, the arc-shaped feeding hopper 13 will be driven to move downward, and the reactants at the lower part of the reaction kettle 1 will be compressed, so that the reactants move upward to contact and react with the reactants at the upper part. And a part of the reactants at the lower part of the reaction kettle 1 will pass through the multiple material passing ports and be located above the arc-shaped feeding hopper 13, so that the reactants at the lower part of the reaction kettle 1 contact and react with the reactants at the upper part. And when the reactants pass through the smaller material passing ports, the material passing ports will compress the reactants, so that the reactants are in pressure contact with each other, accelerating the reaction;

[0047] During the upward movement of the sliding sleeve 4, the reactants above the arc-shaped feeding hopper 13 will fall to move downward to contact and react with the reactants at the lower part of the reaction kettle 1. And a part of the reactants above the arc-shaped feeding hopper 13 will pass through the multiple material passing ports and fall to the lower part of the arc-shaped feeding hopper 13, so that the reactants at the upper part of the reaction kettle 1 contact and react with the reactants at the lower part. Similarly, when the reactants pass through the smaller material passing ports, the material passing ports will compress the reactants, so that the reactants are in pressure contact with each other, accelerating the reaction;

[0048] Since the multiple material passing ports are divided into an interlaced first material port group 132 and a second material port group 133, a first conical port is opened at the bottom end of the first material port group 132, and the larger-diameter end of the first conical port faces downward. A second conical port is opened at the top end of the second material port group 133, and the larger-diameter end of the second conical port faces upward. Therefore, during the downward movement of the arc-shaped feeding hopper 13, it is convenient for the reactants at the lower part of the reaction kettle 1 to quickly contact the reactants at the upper part through the first material port group 132; during the downward movement of the arc-shaped feeding hopper 13, it is convenient for the reactants at the upper part of the reaction kettle 1 to quickly contact the reactants at the lower part through the second material port group 133, further improving the reaction of the reactants, thereby improving the reaction efficiency;

[0049] Among them, during the downward movement of the sliding sleeve 4, the mounting seat 51 will be driven to move downward, and then the main paddle 53 will be driven to rotate around the rotating rod. Moreover, the end of the main paddle 53 slides out of the hinge sleeve 52, causing the main paddle 53 and multiple extension plates 54 and auxiliary paddles 55 on the surface of the main paddle 53 to swing. As a result, while the paddle blade 5 axially mixes the reactants, it drives the reactants to be turbulently mixed, further improving the reaction efficiency of the reactants.

[0050] After a period of time, when the transesterification reaction is completed, phosphoric acid is added for neutralization, and the pH is adjusted to 6.5 - 7.5. After stirring and cooling, the system is allowed to stand and layer. The upper layer is the crude monoglyceride layer, and the lower layer is the incompletely reacted materials and impurities generated during the reaction process. After discharging the lower layer as slag, the remaining liquid is the crude monoglyceride. Further, a short-path molecular distillation device is used to purify the crude monoglyceride. The operating temperatures of the thin-film evaporator and the molecular distiller of the short-path molecular distillation device are both controlled at 160°C - 210°C, the vacuum degree of the thin-film evaporator and the molecular distiller is controlled at 1000 - 6000 Pa, and the flow rate of the crude monoglyceride is controlled at 1.5 - 2.5 ml / min. Finally, high-purity monoglyceride is obtained.

[0051] As mentioned above, the above is only the preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.

Claims

1. An evaporator for producing high-purity low-glycerol molecular distilled monoglyceride, characterized in that, It includes a reaction kettle (1), a kettle cover (2) arranged at the top of the reaction kettle (1), a stirring shaft (3) rotatably arranged in the reaction kettle (1), and a sliding sleeve (4) slidably arranged up and down on the surface of the stirring shaft (3). A plurality of paddle blades (5) are evenly arranged on the surface of the sliding sleeve (4) from top to bottom. A motor for driving the stirring shaft (3) is arranged at the top end of the kettle cover (2). An air supply mechanism (11) is arranged at the bottom end of the sliding sleeve (4). A gas supply component (12) cooperating with the air supply mechanism (11) is arranged on the inner wall of the kettle cover (2). An arc-shaped material pushing hopper (13) is arranged below the air supply mechanism (11). The air supply mechanism (11) includes an air plate (111) installed at the bottom end of the sliding sleeve (4). The opening of the arc-shaped material pushing hopper (13) faces upward. A connecting column (131) is arranged in the middle of the arc-shaped material pushing hopper (13). The top end of the connecting column (131) extends out of the top end of the arc-shaped material pushing hopper (13) and is connected to the bottom end of the air plate (111). A plurality of material passing openings are arranged on the surface of the arc-shaped material pushing hopper (13). The plurality of material passing openings are a first material port group (132) and a second material port group (133). The second material port group (133) is arranged staggered with the first material port group (132). Among them, a first conical opening is arranged at the bottom end of the first material port group (132), and the larger-diameter end of the first conical opening faces downward. A second conical opening is arranged at the top end of the second material port group (133), and the larger-diameter end of the second conical opening faces upward. An air cavity is arranged in the middle of the air plate (111). A plurality of air holes are arranged at the upper right end and the lower left end of the air plate (111). An air outlet one-way valve is embedded in each air hole. The middle of the air plate (111) is communicated with a guide pipe (113). The top end of the guide pipe (113) penetrates through the bottom end of the sliding sleeve (4) and is connected to the lower part of the stirring shaft (3). The middle part of the stirring shaft (3) is a cavity, and the cavity is communicated with the guide pipe (113). A first piston rod (114) is slidably connected up and down in the lower part of the cavity. The bottom end of the first piston rod (114) penetrates through the bottom end of the stirring shaft (3) and is connected to the inner wall of the bottom end of the sliding sleeve (4). A return spring is arranged between the bottom end of the stirring shaft (3) and the inner wall of the sliding sleeve (4).

2. The evaporator for producing high-purity low-glycerol molecular distilled monoglyceride according to claim 1, characterized in that The air supply assembly (12) comprises a cam (121) disposed on the upper part of the stirring shaft (3) and a second piston rod (122) located on the right side of the cam (121); the second piston rod (122) is slidably disposed in an air storage box (123); the air storage box (123) is fixedly connected to the inner wall of the kettle cover (2) via a first mounting plate (124); an air inlet is provided at the lower right end of the air storage box (123); an air inlet check valve is embedded in the air inlet; the air storage box (123) The upper right end of the gas storage box (123) is provided with an air outlet, the upper right end of the gas storage box (123) is provided with an air outlet pipe connected to the air outlet, the air outlet pipe is connected to the inside of the air hood (125), the air hood (125) is rotatably connected to the upper surface of the stirring shaft (3) through a sealing bearing, the upper part of the stirring shaft (3) is provided with an air outlet connected to the inner wall of the air hood (125), and the surface of the air hood (125) is fixedly connected to the inner wall of the kettle cover (2) through a second mounting plate (126).

3. The evaporator for producing high-purity low-glycerol molecular distilled monoglyceride according to claim 2, characterized in that The end of the second piston rod (122) away from the air storage box (123) is fixedly connected to a sliding ball (1221), and the circumferential surface of the cam (121) is provided with an annular sliding groove for the sliding ball (1221) to slide, and the surface of the cam (121) is detachably installed with a limiting ring (1211) to prevent the sliding ball (1221) from sliding out of the annular sliding groove.

4. The evaporator for producing high-purity low-glycerol molecular distilled monoglyceride according to claim 3, characterized in that The surface of the stirring shaft (3) is provided with a strip guide block, and the inner wall of the sliding sleeve (4) is provided with a guide groove that slidably cooperates with the strip guide block, and the top of the guide groove is a through groove.

5. The evaporator for producing high-purity low-glycerol molecular distilled monoglyceride according to claim 4, characterized in that An upper support plate (6) is installed on the upper surface of the stirring shaft (3), and the upper support plate (6) is located below the cam (121). Side scrapers (7) are installed on both left and right ends of the upper support plate (6). The two side scrapers (7) are in contact with the inner wall of the reactor (1), and the side scrapers (7) are arranged parallel to the stirring shaft (3). The bottom ends of the two side scrapers (7) are installed on the top of the connecting plate (8). A through hole for the sliding sleeve (4) to slide up and down is opened in the middle of the connecting plate (8), and an arc-shaped scraper (9) in contact with the inner wall of the bottom of the reactor (1) is arranged at the bottom end of the connecting plate (8).

6. The evaporator for producing high-purity low-glycerol molecular distilled monoglyceride according to claim 5, characterized in that The blade (5) comprises a mounting seat (51) arranged on the surface of the stirring shaft (3) and two hinged sleeves (52) rotatably mounted on the left and right ends of the mounting seat (51); a main paddle (53) is slidably mounted on the ends of the two hinged sleeves (52) that are away from each other, and a plurality of extension plates (54) are mounted on the upper and lower ends of the main paddle (53); a plurality of extension plates (54) are mounted on the ends away from the main paddle (53) and a secondary paddle (55) is disposed; a gap is left between two adjacent secondary paddles (55); the plurality of secondary paddles (55) are arranged parallel to the main paddle (53), and the middle part of the main paddle (53) is rotatably connected to the side support plate (10) via a rotating rod; the top ends of the two side support plates (10) are connected to the upper support plate (6), and the bottom ends are connected to the top end of the connecting plate (8).

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