Molecular distillation equipment for separating high-boiling-point mixture

Abstract

The utility model discloses molecular distillation equipment for separating a high-boiling-point mixture, which relates to the technical field of molecular distillation and comprises a primary evaporation system and a secondary evaporation system, the primary evaporation system comprises a primary molecular distiller, a primary light component collecting tank, a primary heavy component collecting tank and a primary vacuum device, and the secondary evaporation system comprises a secondary molecular distiller, a secondary light component collecting tank and a secondary vacuum device. The second-stage evaporation system comprises a second-stage molecular distiller, a second-stage light component collecting tank, a second-stage heavy component collecting tank and a second-stage vacuum device, a low-boiling-point mixture in the to-be-separated material is removed through the first-stage molecular distiller, and a vacuum state is formed in the first-stage molecular distiller through the first-stage vacuum device; the vacuum state is formed in the second-stage molecular distiller through the first-stage vacuum device, and the second-stage molecular distiller can obtain a stable high-vacuum-degree environment under the combined action of the first-stage vacuum device and the second-stage vacuum device, so that the evaporation temperature of materials is greatly reduced, and high-boiling-point mixtures are efficiently separated at lower temperature.

Description

Technical Field

[0001] The utility model relates to the technical field of molecular distillation, in particular to a molecular distillation device for separating high-boiling-point mixtures. Background Art

[0002] Chemical production processes often generate high-boiling-point mixture wastewater that needs to be separated and recovered. Due to the high boiling point and complex composition of these wastewaters, chemical reactions such as polymerization or decomposition often occur at high temperatures, causing material deterioration and, in turn, preventing the effective recovery of some valuable chemicals in these wastewaters.

[0003] For example, in the production of ethylene glycol, the heavy alcohol in the glycol tower still contains ethylene glycol, diethylene glycol, triethylene glycol, and tetraethylene glycol. Conventional distillation methods not only have low separation efficiency but also result in large quantities of high-value alcohol being disposed of as hazardous waste. Another example is that in the production of diffusion pump oil, to improve product quality, the base oil needs to be separated and purified to increase the content of trimethylpentaphenyltrisiloxane in the product. However, the conventional distillation process operates at temperatures as high as 350°C, resulting in unstable product quality and low yield. Another example is that in the production of polyurethane, the raw material liquid contains high-boiling-point impurities such as 4,4'-diaminodiphenylmethane. The high temperature of the conventional distillation tower still can cause adverse consequences such as coking of the raw material. All of the above examples have the problem of the high distillation temperature of the high-boiling-point mixture causing the separated material to deteriorate easily.

[0004] It can be seen that how to separate and recover high-boiling point mixtures with high efficiency and low energy consumption, thereby improving the stability of the target product, is a problem that needs to be solved urgently. Utility Model Content

[0005] The purpose of the utility model is to provide a molecular distillation device for separating high-boiling-point mixtures to solve the problems existing in the above-mentioned related technologies. It can efficiently separate high-boiling-point mixtures at lower temperatures, thereby improving the recovery rate and stability of the target product.

[0006] To achieve the above purpose, the present invention provides the following solutions:

[0007] The utility model provides a molecular distillation device for separating a high-boiling-point mixture, comprising a primary evaporation system and a secondary evaporation system, wherein the primary evaporation system comprises a primary molecular distiller, a primary light component collecting tank, a primary heavy component collecting tank, and a primary vacuum device, wherein the feed port of the primary molecular distiller is used for introducing a material to be separated, the light component discharge port of the primary molecular distiller is communicated with the feed port of the primary light component collecting tank, the heavy component discharge port of the primary molecular distiller is communicated with the feed port of the primary heavy component collecting tank, and the vacuum port of the primary molecular distiller is connected to the primary vacuum device, and the primary vacuum device is capable of forming a vacuum state in the primary molecular distiller;

[0008] The secondary evaporation system includes a secondary molecular distiller, a secondary light component collection tank, a secondary heavy component collection tank and a secondary vacuum device. The feed port of the secondary molecular distiller is communicated with the discharge port of the primary heavy component collection tank, the light component discharge port of the secondary molecular distiller is communicated with the feed port of the secondary light component collection tank, the heavy component discharge port of the secondary molecular distiller is communicated with the feed port of the secondary heavy component collection tank, and the vacuum port of the secondary molecular distiller is connected to the secondary vacuum device. The secondary vacuum device can form a vacuum state in the secondary molecular distiller.

[0009] Preferably, the first-level molecular distiller comprises a first-level distiller shell, a first-level heater, a first-level separation disc assembly and a first-level condenser, wherein a first-level feed port is provided on the upper portion of the first-level distiller shell, and the first-level feed port is used to introduce the material to be separated; the first-level heater is provided on the first-level distiller shell, and the first-level heater can heat the first-level distiller shell so that the inner wall thereof forms a first-level heating surface, and the first-level separation disc assembly is provided in the first-level distiller shell, and the first-level separation disc assembly can disperse the material to be separated in the first-level distiller shell onto the first-level heating surface; the first-level condenser is provided in the first-level distiller shell, and the outer wall of the first-level condenser can form a first-level condensing surface;

[0010] A first-level light component collection tray and a first-level heavy component collection tray are provided at the bottom of the first-level distiller shell. The first-level light component collection tray can collect the light component material condensed on the first-level condensing surface, and the discharge port of the first-level light component collection tray is connected to the feed port of the first-level light component collection tank; the first-level heavy component collection tray can collect the heavy component material in the first-level distiller shell, and the discharge port of the first-level heavy component collection tray is connected to the feed port of the first-level heavy component collection tank; a first-level vacuum port is provided at the lower part of the first-level distiller shell, and the first-level vacuum port is connected to the first-level vacuum device.

[0011] Preferably, the first-level separation disc assembly includes a first-level separation disc body, a first-level scraper and a first-level motor. The first-level separation disc body is arranged in the first-level distiller shell at a position close to the first-level feed port, and the first-level scraper is arranged on the first-level separation disc body. The output end of the first-level motor is connected to the first-level separation disc body. The first-level motor can drive the first-level separation disc body to rotate, so as to drive the first-level scraper to rotate along the first-level heating surface, thereby forming a liquid film on the first-level heating surface.

[0012] Preferably, the primary vacuum device comprises a primary cold trap and a primary vacuum pump which are connected in sequence, the air inlet of the primary cold trap is connected to the vacuum port of the primary molecular distiller; and the primary vacuum pump is a water ring vacuum pump.

[0013] Preferably, the secondary molecular distiller comprises a secondary distiller shell, a secondary heater, a secondary separation disc assembly and a secondary condenser, the upper portion of the secondary distiller shell is provided with a secondary feed port, the secondary feed port is communicated with the discharge port of the primary heavy component collection tank; the secondary heater is provided on the secondary distiller shell, the secondary heater can heat the secondary distiller shell so that the inner wall thereof forms a secondary heating surface, and the secondary separation disc assembly is provided in the secondary distiller shell, the secondary separation disc assembly can disperse the material to be separated in the secondary distiller shell onto the secondary heating surface; the secondary condenser is provided in the secondary distiller shell, and the outer wall of the secondary condenser can form a secondary condensing surface;

[0014] A secondary light component collection tray and a secondary heavy component collection tray are provided at the bottom of the secondary distiller shell. The secondary light component collection tray can collect the light component material condensed on the secondary condensing surface, and the discharge port of the secondary light component collection tray is connected to the feed port of the secondary light component collection tank; the secondary heavy component collection tray can collect the heavy component material in the secondary distiller shell, and the discharge port of the secondary heavy component collection tray is connected to the feed port of the secondary heavy component collection tank; a secondary vacuum port is provided at the lower part of the secondary distiller shell, and the secondary vacuum port is connected to the secondary vacuum device.

[0015] Preferably, the secondary separation disc assembly includes a secondary separation disc body, a secondary scraper and a secondary motor. The secondary separation disc body is arranged in the secondary distiller shell at a position close to the secondary feed inlet, and the secondary scraper is arranged on the secondary separation disc body. The output end of the secondary motor is connected to the secondary separation disc body. The secondary motor can drive the secondary separation disc body to rotate, so as to drive the secondary scraper to rotate along the secondary heating surface, thereby forming a liquid film on the secondary heating surface.

[0016] Preferably, the secondary scraper includes a support rod and a scraper, the support rod is vertically fixed on the secondary separation disc body, one side of the scraper is provided with scraping teeth, and the other side is fixedly connected to the support rod, and there are multiple scrapers, all of which are evenly distributed on the support rod along the axial direction.

[0017] Preferably, the secondary vacuum device includes a secondary cold trap and a secondary vacuum pump connected in sequence, the air inlet of the secondary cold trap is connected to the vacuum port of the secondary molecular distiller; and the secondary vacuum pump is a Roots vacuum pump.

[0018] Preferably, the first-stage heater and the second-stage heater are both thermal oil heating jackets.

[0019] Preferably, the primary condenser and the secondary condenser are both coil condensers.

[0020] Compared with the related art, the utility model has achieved the following technical effects:

[0021] The molecular distillation equipment for separating high-boiling-point mixtures provided by the utility model comprises a primary evaporation system and a secondary evaporation system, wherein the primary evaporation system comprises a primary molecular distiller, a primary light component collecting tank, a primary heavy component collecting tank and a primary vacuum device, and the secondary evaporation system comprises a secondary molecular distiller, a secondary light component collecting tank, a secondary heavy component collecting tank and a secondary vacuum device. During operation, the low-boiling-point mixture in the material to be separated is removed by the primary molecular distiller, and a vacuum state is formed in the primary molecular distiller by the primary vacuum device, and a vacuum state is formed in the secondary molecular distiller by the secondary vacuum device. Under the joint action of the primary vacuum device and the secondary vacuum device, it is ensured that the secondary molecular distiller can obtain a stable high-vacuum environment, thereby significantly reducing the evaporation temperature of the material, effectively preventing the high-boiling-point mixture from reacting, polymerizing, decomposing or deteriorating, achieving efficient separation of the high-boiling-point mixture at a lower temperature, and improving the recovery rate and stability of the target product. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 A schematic diagram of a molecular distillation device for separating high-boiling-point mixtures provided in an embodiment of the present invention;

[0024] Figure 2 A schematic diagram of a scraper provided in an embodiment of the present utility model.

[0025] In the figure: 1-first-level molecular still, the feed port of 101-first-level molecular still, the vacuum port of 102-first-level molecular still, 103-first-level heater, 104-first-level separation disk assembly, 105-first-level condenser, 2-first-level light component collection tank, 3-first-level heavy component collection tank, 4-first-level cold trap, 5-first-level vacuum pump, 6-secondary molecular still, the feed port of 601-secondary molecular still, the vacuum port of 602-secondary molecular still, 603-secondary heater, 604-secondary separation disk assembly, 605-secondary condenser, 606-scraper, 7-secondary light component collection tank, 8-secondary heavy component collection tank, 9-secondary cold trap, 10-secondary vacuum pump. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0027] The purpose of the utility model is to provide a molecular distillation device for separating high-boiling-point mixtures to solve the problems existing in the related art. It can efficiently separate high-boiling-point mixtures at a lower temperature, thereby improving the recovery rate and stability of the target product.

[0028] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific implementation methods.

[0029] like Figure 1 As shown, the present embodiment provides a molecular distillation device for separating a high boiling point mixture, comprising a primary evaporation system and a secondary evaporation system, the primary evaporation system comprising a primary molecular distiller 1, a primary light component collection tank 2, a primary heavy component collection tank 3 and a primary vacuum device, the feed port 101 of the primary molecular distiller is used to pass the material to be separated, the light component discharge port of the primary molecular distiller 1 is communicated with the feed port of the primary light component collection tank 2, the heavy component discharge port of the primary molecular distiller 1 is communicated with the feed port of the primary heavy component collection tank 3, and the vacuum port 102 of the primary molecular distiller is connected to the primary vacuum device, and the primary vacuum device can form a vacuum state in the primary molecular distiller 1; specifically, the primary vacuum device in this embodiment comprises a primary cold trap 4 and a primary vacuum pump 5 connected in sequence, the air inlet of the primary cold trap 4 is communicated with the vacuum port 102 of the primary molecular distiller, and the primary vacuum pump 5 is preferably a water ring vacuum pump.

[0030] In the present embodiment, the secondary evaporation system includes a secondary molecular distiller 6, a secondary light component collecting tank 7, a secondary heavy component collecting tank 8 and a secondary vacuum device, the feed port 601 of the secondary molecular distiller is communicated with the discharge port of the primary heavy component collecting tank 3, the light component discharge port of the secondary molecular distiller 6 is communicated with the feed port of the secondary light component collecting tank 7, the heavy component discharge port of the secondary molecular distiller 6 is communicated with the feed port of the secondary heavy component collecting tank 8, and the vacuum port 602 of the secondary molecular distiller is connected to the secondary vacuum device, and the secondary vacuum device can form a vacuum state in the secondary molecular distiller 6; specifically, the secondary vacuum device in the present embodiment includes a secondary cold trap 9 and a secondary vacuum pump 10 that are communicated in sequence, the air inlet of the secondary cold trap 9 is communicated with the vacuum port 602 of the secondary molecular distiller, and the secondary vacuum pump 10 is preferably a Roots vacuum pump.

[0031] In this embodiment, the first-stage molecular distiller 1 includes a first-stage distiller shell, a first-stage heater 103, a first-stage separation disc assembly 104 and a first-stage condenser 105. The upper part of the first-stage distiller shell is provided with a first-stage feed port, which is used to pass the material to be separated; the first-stage heater 103 is provided on the first-stage distiller shell, and the first-stage heater 103 can heat the first-stage distiller shell so that its inner wall forms a first-stage heating surface, and the first-stage separation disc assembly 104 is provided in the first-stage distiller shell, and the first-stage separation disc assembly 104 can disperse the material to be separated in the first-stage distiller shell onto the first-stage heating surface; the first-stage condenser 105 is provided in the first-stage distiller shell, and the outer wall of the first-stage condenser 105 can form a first-stage condensing surface; specifically, The first-level distiller shell in this embodiment is a barrel-shaped structure, and the first-level heater 103 is preferably a thermal oil heating jacket, which is mounted on the first-level distiller shell, and heating is achieved by circulating thermal oil in the first-level heater 103; the first-level condenser 105 in this embodiment is preferably a coil condenser, which is arranged in the middle of the first-level distiller shell, and condensation is achieved by circulating condensed water in the first-level condenser 105, and, in this embodiment, the distance between the first-level condensation surface formed on the side of the first-level condenser 105 and the corresponding inner wall of the first-level distiller shell (i.e., the first-level heating surface) is preferably 10cm-20cm, and the distance between the first-level condensation surface and the first-level heating surface is shortened to reduce the evaporation temperature of the material.

[0032] In this embodiment, a first-level light component collection tray and a first-level heavy component collection tray are provided at the bottom of the first-level distiller shell. The first-level light component collection tray can collect the light component material condensed on the first-level condensation surface, and the discharge port of the first-level light component collection tray is connected to the feed port of the first-level light component collection tank 2; the first-level heavy component collection tray can collect the heavy component material in the first-level distiller shell, and the discharge port of the first-level heavy component collection tray is connected to the feed port of the first-level heavy component collection tank 3; the lower part of the first-level distiller shell is provided with a first-level vacuum port, and the first-level vacuum port is connected to the air inlet of the first-level cold trap 4.

[0033] In this embodiment, the first-stage separation disc assembly 104 includes a first-stage separation disc body, a first-stage scraper and a first-stage motor. The first-stage separation disc body is arranged in the first-stage distiller shell near the first-stage feed inlet. Specifically, the first-stage separation disc body in this embodiment is a solid disc structure, and the first-stage feed inlet extends along the tangential direction of the first-stage separation disc body; the first-stage scraper is arranged on the first-stage separation disc body, and the output end of the first-stage motor is connected to the first-stage separation disc body. The first-stage motor can drive the first-stage separation disc body to rotate, so as to drive the first-stage scraper to rotate along the first-stage heating surface, thereby forming a liquid film on the first-stage heating surface; the effect of the liquid film It should be noted that after being heated by the first-level heating surface, the light and heavy molecules in the material will escape from the liquid film surface and enter the gas phase. Since the free paths of light and heavy molecules are different, the molecules of different substances move different distances after escaping from the liquid film surface. Since the distance between the first-level condensation surface and the first-level heating surface is less than the average free path of the light component molecules and greater than the average free path of the heavy component molecules, the light component molecules escaping from the liquid film surface can reach the first-level condensation surface and be continuously condensed, while the heavy component molecules cannot reach the first-level condensation surface, so they return to the liquid film to form a residual liquid, thereby realizing the separation of light and heavy components of the liquid mixture.

[0034] In this embodiment, the secondary molecular distiller 6 includes a secondary distiller shell, a secondary heater 603, a secondary separation disc assembly 604 and a secondary condenser 605. The upper part of the secondary distiller shell is provided with a secondary feed port, and the secondary feed port is connected to the discharge port of the primary heavy component collection tank 3; the secondary heater 603 is provided on the secondary distiller shell, and the secondary heater 603 can heat the secondary distiller shell so that the inner wall thereof forms a secondary heating surface, and the secondary separation disc assembly 604 is provided in the secondary distiller shell, and the secondary separation disc assembly 604 can disperse the material to be separated in the secondary distiller shell onto the secondary heating surface; the secondary condenser 605 is provided in the secondary distiller shell, and the outer wall of the secondary condenser 605 can form a secondary condensing surface ; Specifically, the secondary distiller shell in this embodiment is a barrel-shaped structure, the secondary heater 603 is preferably a heat transfer oil heating jacket, the secondary heater 603 is mounted on the secondary distiller shell, and heating is achieved by circulating heat transfer oil in the secondary heater 603; the secondary condenser 605 in this embodiment is preferably a coil condenser, the secondary condenser 605 is arranged in the middle of the secondary distiller shell, and condensation is achieved by circulating condensed water in the secondary condenser 605, and, in this embodiment, the distance between the secondary condensation surface formed on the side of the secondary condenser 605 and the corresponding inner wall of the secondary distiller shell (i.e., the secondary heating surface) is preferably 5cm-9cm, and the distance between the secondary condensation surface and the secondary heating surface is shortened to reduce the evaporation temperature of the material.

[0035] In this embodiment, a secondary light component collection tray and a secondary heavy component collection tray are provided at the bottom of the secondary distiller shell. The secondary light component collection tray can collect the light component material condensed on the secondary condensation surface, and the discharge port of the secondary light component collection tray is connected to the feed port of the secondary light component collection tank 7; the secondary heavy component collection tray can collect the heavy component material in the secondary distiller shell, and the discharge port of the secondary heavy component collection tray is connected to the feed port of the secondary heavy component collection tank 8; the lower part of the secondary distiller shell is provided with a secondary vacuum port, and the secondary vacuum port is connected to the air inlet of the secondary cold trap 9.

[0036] In this embodiment, the secondary separation disc assembly 604 includes a secondary separation disc body, a secondary scraper and a secondary motor. The secondary separation disc body is arranged in the secondary distiller shell near the secondary feed inlet. Specifically, the secondary separation disc body in this embodiment is a solid disc structure, and the secondary feed inlet extends along the tangential direction of the secondary separation disc body; the secondary scraper is arranged on the secondary separation disc body, and the output end of the secondary motor is connected to the secondary separation disc body. The secondary motor can drive the secondary separation disc body to rotate, so as to drive the secondary scraper to rotate along the secondary heating surface, thereby forming a liquid film on the secondary heating surface; the effect of the liquid film It should be noted that after being heated by the secondary heating surface, the light and heavy molecules in the material will escape from the liquid film surface and enter the gas phase. Since the free paths of light and heavy molecules are different, the molecules of different substances move different distances after escaping from the liquid film surface. Since the distance between the secondary condensation surface and the secondary heating surface is less than the average free path of the light component molecules and greater than the average free path of the heavy component molecules, the light component molecules escaping from the liquid film surface can reach the secondary condensation surface and be continuously condensed, while the heavy component molecules cannot reach the secondary condensation surface, so they return to the liquid film to form a residual liquid, thereby realizing the separation of light and heavy components of the liquid mixture.

[0037] In this embodiment, the secondary scraper includes a support rod and a scraper 606. The support rod is vertically fixed to the secondary separation disc body. One side of the scraper 606 is provided with scraping teeth, and the other side is fixedly connected to the support rod. There are multiple scrapers 606, and all scrapers 606 are evenly distributed on the support rod along the axial direction. The design of the built-in scraper strengthens the stirring of the material on the secondary heating surface and avoids scaling. In addition, the design of the split scraper also avoids deformation, jamming and other failures of the scraper 606. Specifically, Figure 2 As shown, the size of a single scraper 606 in this embodiment is 13cm×3cm×3cm, and there are 6 grooves with a size of 1cm×3cm×1cm evenly distributed on one side along its length to form scraping teeth; in this embodiment, the material of the scraper 606 is preferably polytetrafluoroethylene. In addition, the material of the first-level evaporator shell, the second-level evaporator shell, the first-level separation disc body, the second-level separation disc body, the first-level condenser 105, the second-level condenser 605, the first-level light component collection tank 2, the second-level light component collection tank 7, the first-level heavy component collection tank 3 and the second-level heavy component collection tank 8 are all made of stainless steel.

[0038] The working process of the molecular distillation equipment for separating high boiling point mixtures provided in this embodiment is as follows:

[0039] The high boiling point mixture (the normal pressure boiling point range of the compound is 100°C-500°C) enters the first-level molecular distiller 1 through the feed port 101 of the first-level molecular distiller, and is dispersed to the first-level heating surface under the action of the first-level separation disk assembly 104. Under the action of the first-level vacuum pump 5 (i.e., a water ring vacuum pump), the internal absolute pressure of the first-level molecular distiller 1 is 2000Pa-5000Pa. Part of the low boiling point compound in the high boiling point mixture is evaporated into a gaseous state by the first-level heater 103, and is condensed into the first-level light component collection tank 2 after encountering the first-level condenser 105. The remaining heavy components enter the first-level heavy component collection tank 3. The material in the first-level heavy component collection tank 3 enters the second-level molecular distiller 6 through the feed port 601 of the second-level molecular distiller. Under the action of the second-level separation disk assembly 604, the material is dispersed to the second-level heating surface. Under the action of the second-level vacuum pump 10 (i.e., a Roots vacuum pump), the internal absolute pressure of the second-level molecular distiller 6 is 5Pa-500. Pa, the light components that need to be recovered (or removed) in the high-boiling-point mixture are heated into a gaseous state through the secondary heater 603 (the built-in scraper 606 strengthens the stirring of the material on the secondary heating surface to avoid scaling). The volatilized light components encounter the secondary condenser 605 and are condensed into the secondary light component collection tank 7, and the remaining heavy components enter the secondary heavy component collection tank 8, thereby realizing efficient separation of the high-boiling-point mixture.

[0040] The present invention uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A molecular distillation device for separating high boiling point mixtures, characterized in that: It comprises a primary evaporation system and a secondary evaporation system, wherein the primary evaporation system comprises a primary molecular distiller, a primary light component collecting tank, a primary heavy component collecting tank and a primary vacuum device, wherein the feed port of the primary molecular distiller is used to introduce the material to be separated, the light component discharge port of the primary molecular distiller is communicated with the feed port of the primary light component collecting tank, the heavy component discharge port of the primary molecular distiller is communicated with the feed port of the primary heavy component collecting tank, and the vacuum port of the primary molecular distiller is connected to the primary vacuum device, and the primary vacuum device can form a vacuum state in the primary molecular distiller; The secondary evaporation system includes a secondary molecular distiller, a secondary light component collection tank, a secondary heavy component collection tank and a secondary vacuum device. The feed port of the secondary molecular distiller is communicated with the discharge port of the primary heavy component collection tank, the light component discharge port of the secondary molecular distiller is communicated with the feed port of the secondary light component collection tank, the heavy component discharge port of the secondary molecular distiller is communicated with the feed port of the secondary heavy component collection tank, and the vacuum port of the secondary molecular distiller is connected to the secondary vacuum device. The secondary vacuum device can form a vacuum state in the secondary molecular distiller.

2. The molecular distillation device for separating high boiling point mixtures according to claim 1, characterized in that: The first-level molecular distiller comprises a first-level distiller shell, a first-level heater, a first-level separation disc assembly and a first-level condenser. The upper portion of the first-level distiller shell is provided with a first-level feed port, and the first-level feed port is used to introduce the material to be separated; the first-level heater is provided on the first-level distiller shell, and the first-level heater can heat the first-level distiller shell so that the inner wall thereof forms a first-level heating surface, and the first-level separation disc assembly is provided in the first-level distiller shell, and the first-level separation disc assembly can disperse the material to be separated in the first-level distiller shell onto the first-level heating surface; the first-level condenser is provided in the first-level distiller shell, and the outer wall of the first-level condenser can form a first-level condensing surface; A first-level light component collection tray and a first-level heavy component collection tray are provided at the bottom of the first-level distiller shell. The first-level light component collection tray can collect the light component material condensed on the first-level condensing surface, and the discharge port of the first-level light component collection tray is connected to the feed port of the first-level light component collection tank; the first-level heavy component collection tray can collect the heavy component material in the first-level distiller shell, and the discharge port of the first-level heavy component collection tray is connected to the feed port of the first-level heavy component collection tank; a first-level vacuum port is provided at the lower part of the first-level distiller shell, and the first-level vacuum port is connected to the first-level vacuum device.

3. The molecular distillation device for separating high boiling point mixtures according to claim 2, characterized in that: The first-level separation disc assembly includes a first-level separation disc body, a first-level scraper and a first-level motor. The first-level separation disc body is arranged in the first-level distiller shell at a position close to the first-level feed port. The first-level scraper is arranged on the first-level separation disc body. The output end of the first-level motor is connected to the first-level separation disc body. The first-level motor can drive the first-level separation disc body to rotate, so as to drive the first-level scraper to rotate along the first-level heating surface, thereby forming a liquid film on the first-level heating surface.

4. The molecular distillation equipment for separating high boiling point mixtures according to claim 1, characterized in that: The primary vacuum device comprises a primary cold trap and a primary vacuum pump which are connected in sequence, wherein the air inlet of the primary cold trap is connected to the vacuum port of the primary molecular distiller; and the primary vacuum pump is a water ring vacuum pump.

5. The molecular distillation device for separating high boiling point mixtures according to claim 2, characterized in that: The secondary molecular distiller comprises a secondary distiller shell, a secondary heater, a secondary separation disc assembly and a secondary condenser. A secondary feed port is provided on the upper portion of the secondary distiller shell, and the secondary feed port is communicated with the discharge port of the primary heavy component collection tank; the secondary heater is provided on the secondary distiller shell, and the secondary heater can heat the secondary distiller shell so that the inner wall thereof forms a secondary heating surface, and the secondary separation disc assembly is provided in the secondary distiller shell, and the secondary separation disc assembly can disperse the material to be separated in the secondary distiller shell onto the secondary heating surface; the secondary condenser is provided in the secondary distiller shell, and the outer wall of the secondary condenser can form a secondary condensing surface; A secondary light component collection tray and a secondary heavy component collection tray are provided at the bottom of the secondary distiller shell. The secondary light component collection tray can collect the light component material condensed on the secondary condensing surface, and the discharge port of the secondary light component collection tray is connected to the feed port of the secondary light component collection tank; the secondary heavy component collection tray can collect the heavy component material in the secondary distiller shell, and the discharge port of the secondary heavy component collection tray is connected to the feed port of the secondary heavy component collection tank; a secondary vacuum port is provided at the lower part of the secondary distiller shell, and the secondary vacuum port is connected to the secondary vacuum device.

6. The molecular distillation device for separating high boiling point mixtures according to claim 5, characterized in that: The secondary separation disc assembly includes a secondary separation disc body, a secondary scraper and a secondary motor. The secondary separation disc body is arranged in the secondary distiller shell at a position close to the secondary feed port. The secondary scraper is arranged on the secondary separation disc body. The output end of the secondary motor is connected to the secondary separation disc body. The secondary motor can drive the secondary separation disc body to rotate, so as to drive the secondary scraper to rotate along the secondary heating surface, thereby forming a liquid film on the secondary heating surface.

7. The molecular distillation equipment for separating high boiling point mixtures according to claim 6, characterized in that: The secondary scraper includes a support rod and a scraper. The support rod is vertically fixed on the secondary separation disc body. One side of the scraper is provided with scraping teeth, and the other side is fixedly connected to the support rod. There are multiple scrapers, and all of the scrapers are evenly distributed on the support rod along the axial direction.

8. The molecular distillation equipment for separating high boiling point mixtures according to claim 1, characterized in that: The secondary vacuum device comprises a secondary cold trap and a secondary vacuum pump which are connected in sequence. The air inlet of the secondary cold trap is connected to the vacuum port of the secondary molecular distiller. The secondary vacuum pump is a Roots vacuum pump.

9. The molecular distillation equipment for separating high boiling point mixtures according to claim 5, characterized in that: The first-stage heater and the second-stage heater are both thermal oil heating jackets.

10. The molecular distillation equipment for separating high boiling point mixtures according to claim 5, characterized in that: The primary condenser and the secondary condenser are both coil condensers.

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