A rotary evaporator capable of accurately quantifying a concentrate and / or a fraction

Abstract

The present application relates to the technical field of chemical experiment equipment, in particular to a rotary evaporator, and more particularly to a rotary evaporator capable of accurately measuring the amount of concentrated liquid and / or distillate. The rotary evaporator capable of accurately measuring the amount of concentrated liquid and / or distillate improves the spherical collecting bottle into a metering tube with upper and lower valves and scale lines, or connects a metering tube with upper and lower valves and scale lines at the opening of the bottom of the spherical collecting bottle; a spherical bulge capable of accurate measurement is arranged between the lower part of the metering tube and the two valves to meet the need of expansion; the opening of the bottom of the working position of the spherical distillation bottle is connected with a quantitative tube with upper and lower valves and scale lines, and a spherical bulge capable of accurate measurement is arranged between the lower part of the quantitative tube and the two valves to meet the need of expansion; the distillation bottle and / or the collecting bottle can be not disassembled, and accurate measurement, quantitative control and one-time liquid discharge of the amount of concentrated liquid and / or distillate are realized. The improved rotary evaporator is simple in structure, convenient to process, high in reliability and low in cost.

Description

[0001] This application claims priority to U.S. Patent Application (Patent Application No. U.S 17508076) filed on October 22, 2021 with the United States Patent and Trademark Office, the contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the technical field of chemical experiment equipment, in particular, relates to a rotary evaporator, and more particularly to a rotary evaporator capable of accurately quantifying concentrated liquid and / or distillate. BACKGROUND

[0003] The rotary evaporator is an extraction experiment equipment for reducing pressure distillation and concentration of materials, and is widely used in experiments such as scale concentration, drying, extraction recovery, etc., especially for rapid distillation of a large amount of solvent. The existing rotary evaporator is usually composed of a vacuum pumping device, a heating device, a condensing device, a rotating device, etc. The principle of the rotary evaporator is mainly to control by electronic equipment, so that the flask rotates at the most suitable speed, the solution forms a thin film, the evaporation area is increased, and the evaporation flask is in a negative pressure state through the vacuum pump. The evaporation flask is heated in a water bath or oil bath at a constant temperature while rotating, and the heating temperature can approach the boiling point of the solvent, so that the solution in the bottle is heated and diffused under negative pressure to evaporate, realizing rapid evaporation of the solvent.

[0004] The existing commonly used rotary evaporator cannot accurately measure and quantitatively control the amount of distillate in the collection bottle or the amount of concentrated liquid in the distillation flask. Patents (201810061892.4) and (201810061916.6) disclose a rotary evaporator capable of accurately realizing distillate quantification and a rotary evaporator capable of accurately realizing concentrated liquid quantification. In which: (1) The structure design scheme of the quantitative expansion vessel and the metering expansion vessel makes it difficult to quantitatively mark the scale line during processing, which makes the processing of the quantitative assembly very time-consuming. For quantitative assemblies with high accuracy requirements (such as requiring to be accurate to 0.01 mL), even processing is not possible, thereby increasing the cost; (2) The electric heating belt is used to heat each time, and the heating belt and glass fiber belt need to be wrapped around the distillation flask, which is time-consuming and low in efficiency. The above shortcomings affect the popularization and application of the technology, and there is an urgent need for a quantitative method and technology that can be quickly processed, has a simple structure, and is efficient in use. SUMMARY

[0005] The present application provides a rotary evaporator capable of accurately quantifying concentrated liquid, a rotary evaporator capable of accurately quantifying distillate, and a rotary evaporator capable of accurately quantifying distillate and concentrated liquid. (1) The problems of difficult processing of distillate quantitative assembly and concentrated liquid quantitative assembly are solved; (2) The structure of the rotary evaporator is simplified; (3) A heating assembly with high efficiency is also provided.

[0006] To achieve the above object, the application provides a rotary evaporator capable of accurately quantifying concentrated liquid, comprising a support, a detachable distillation flask and a condenser fixed on the support, and a motor, wherein the distillation flask is heated by a heating assembly, the bottom of the condenser is connected with a collection bottle, and the top of the condenser is connected with a vacuum pumping device; the motor drives the distillation flask to rotate.

[0007] A distillation flask liquid outlet is formed at the bottom of the working position of the distillation flask, and the distillation flask liquid outlet is connected with a concentrated liquid quantifying assembly.

[0008] Inspired by the structure of the airlock cabin of a spacecraft, the concentrated liquid quantifying assembly comprises a quantifying tube with quantifying scale, a first liquid outlet valve and a second liquid outlet valve, and the second liquid outlet valve arranged at the bottom of the quantifying tube is used to control the quantitative discharge and sealing of the concentrated liquid. The first liquid outlet valve is arranged at the distillation flask liquid outlet to control the quantitative discharge of the concentrated liquid and seal the distillation flask.

[0009] The function of the concentrated liquid quantifying assembly is inspired by the function of the airlock cabin: under different pressure environments (near vacuum) inside and outside the system (atmospheric pressure), the material can be transported from the inside to the outside without causing great influence on the system (inside), that is, the amount of the concentrated liquid can be quantitatively controlled and the discharged concentrated liquid is quantified.

[0010] The quantifying tube is in a thin tube structure, and the capacity of the quantifying tube is a certain value of 1-20 mL.

[0011] The distillation flask liquid outlet is formed at the lowest liquid surface of the working position of the distillation flask.

[0012] The concentrated liquid quantifying assembly and the distillation flask liquid outlet are integrally formed or are connected in a glass ground sealing manner and fixed by a clamp.

[0013] A quantifying capacity increasing container is further arranged on the second liquid outlet valve at the lower part of the quantifying tube, which is used for increasing the capacity in a measurable manner, so as to realize one-time liquid discharge of the concentrated liquid.

[0014] Preferably, the quantifying capacity increasing container is a spherical bulging structure at the lower part of the quantifying tube.

[0015] The quantifying capacity increasing container comprises multiple containers with different capacities (such as 1 mL, 2 mL, 3 mL, 5 mL, 10 mL and 20 mL, but not limited thereto), and the appropriate one is selected according to the capacity requirement of the concentrated liquid.

[0016] The heating assembly is an electric heating sleeve arranged at the outer wall of the distillation flask, which can be an electric heating belt or an electric heating furnace, and preferably is a movable electric heating furnace.

[0017] The shape of the movable electric heating furnace is adapted to the distillation flask.

[0018] Further, preferably, the electric heating furnace is composed of two movable parts (electric heating furnace one and electric heating furnace two) or three parts, and the heating of the distillation flask is realized by the cooperation of the parts.

[0019] Further, preferably, the electric heating furnace is composed of two movable parts (electric heating furnace one and electric heating furnace two) or three parts, and the heating of the distillation flask is realized by the cooperation of the parts.

[0020] The electric heating furnace and the distillation flask are further provided with a temperature controller sensor probe.

[0021] To achieve the above-mentioned purpose, the present application provides a rotary evaporator capable of accurately quantifying the distillate, comprising a support, a detachable distillation flask and a condenser fixed on the support, and a motor, the distillation flask is heated by a heating assembly, the bottom of the condenser is connected with a distillate quantifying assembly, and the top is connected with a vacuum pumping device; the motor drives the distillation flask to rotate.

[0022] Inspired by the structure of the airlock cabin of a spacecraft, the distillate quantifying assembly has two settings.

[0023] The first distillate quantifying assembly comprises a metering tube with metering scale, a first liquid discharge valve and a second liquid discharge valve, and the discharge and sealing of the distillate are controlled by the second liquid discharge valve arranged at the bottom of the metering tube.

[0024] The first liquid discharge valve is arranged at the opening of the bottom of the condenser to control the discharge of the distillate and sealing.

[0025] The second distillate quantifying assembly comprises a collection bottle, a metering tube with metering scale, a first liquid discharge valve and a second liquid discharge valve, and the discharge and sealing of the distillate are controlled by the second liquid discharge valve arranged at the bottom of the metering tube.

[0026] A liquid discharge port is formed at the lowest liquid surface of the bottom of the collection bottle, and the first liquid discharge valve is arranged at the liquid discharge port to control the discharge of the distillate and sealing.

[0027] The function of the distillate quantifying assembly is inspired by the function of the airlock cabin: under different pressure environments (near vacuum) inside and outside the system (atmospheric pressure), the material can be transported from the inside to the outside without causing great influence on the system, that is, the amount of the distillate can be quantitatively controlled and the distillate can be discharged quantitatively.

[0028] The metering tube is in the form of a thin tube, and the capacity of the metering tube is a certain value of 1-20 mL.

[0029] The metering tube and the opening of the bottom of the condenser or the liquid discharge port are integrally formed or are connected in a glass ground sealing manner and are fixed by a clamp.

[0030] The lower part of the metering tube is further provided with a metering expansion vessel above the second liquid discharge valve for metering expansion, so as to realize one-time liquid discharge of the distillate.

[0031] Preferably, the metering expansion vessel is a spherical bulging structure of the lower part of the metering tube.

[0032] The metering expansion vessel includes multiple vessels with different capacities (such as 10 mL, 20 mL, 30 mL, 50 mL, 100 mL and 200 mL, but not limited thereto), and a suitable metering tube is selected according to the capacity requirement of the distillate.

[0033] To achieve the above-mentioned purposes, the application provides a rotary evaporator capable of accurately metering concentrated liquid and distillate, comprising a support, a detachable distillation flask and a condenser fixed on the support, and a motor, the distillation flask is heated by a heating assembly, the bottom of the condenser is connected with a distillate metering assembly, and the top of the condenser is connected with a vacuum pumping device; the motor drives the distillation flask to rotate;

[0034] A distillation flask liquid discharge port is formed at the bottom of the working position of the distillation flask, the distillation flask liquid discharge port is connected with the concentrated liquid metering assembly, and the amount of the concentrated liquid is accurately measured, quantitatively controlled and discharged;

[0035] The bottom opening of the condenser is connected with the glass ball grinding port of the distillate metering assembly, so as to store the distillate, accurately measure and control the amount of the distillate, and discharge the distillate.

[0036] Inspired by the structure and function of the airlock cabin, the concentrated liquid metering assembly includes a metering tube with metering scale lines, a first liquid discharge valve and a second liquid discharge valve, and the second liquid discharge valve arranged at the bottom of the metering tube is used to control the discharge and sealing of the concentrated liquid;

[0037] The metering tube is a thin tube structure, and the capacity of the metering tube is a certain value in 1-20 mL.

[0038] Inspired by the structure and function of the airlock cabin, the first distillate metering assembly includes a metering tube with metering scale lines, a first liquid discharge valve and a second liquid discharge valve, and the second liquid discharge valve arranged at the bottom of the metering tube is used to control the discharge and sealing of the distillate;

[0039] The first liquid discharge valve is arranged at the bottom opening of the condenser.

[0040] The second distillate metering assembly includes a collection bottle, a metering tube with metering scale lines, a first liquid discharge valve and a second liquid discharge valve, and the second liquid discharge valve arranged at the bottom of the metering tube is used to control the discharge and sealing of the distillate.

[0041] A liquid discharge port is formed at the lowest liquid surface of the bottom of the collection bottle, and the first liquid discharge valve is arranged at the liquid discharge port.

[0042] The metering tube is a thin tube structure, and the capacity of the metering tube is a value in 1-20 mL.

[0043] The distillation flask is provided with a first liquid discharge valve at the liquid discharge port of the distillation flask for discharge control of the concentrated liquid and sealing of the distillation flask; and the liquid discharge port of the distillation flask is formed at the lowest liquid level of the working position of the distillation flask.

[0044] The concentrated liquid metering assembly and the liquid discharge port of the distillation flask are integrally formed or are connected in a glass ground opening and are fixed by a clamp.

[0045] The metering tube and the bottom opening of the condenser or the liquid discharge port of the collection bottle are integrally formed or are connected in a glass ground opening and are fixed by a clamp.

[0046] The lower part of the metering tube is further provided with a metering capacity increaser above the second liquid discharge valve, which is used for metering capacity increase, so as to realize one-time liquid discharge of the concentrated liquid.

[0047] The lower part of the metering tube is further provided with a metering capacity increaser above the second liquid discharge valve, which is used for metering capacity increase, so as to realize one-time liquid discharge of the concentrated liquid.

[0048] The metering capacity increaser includes a plurality of different capacities, and a suitable metering tube is selected according to the capacity of the concentrated liquid.

[0049] Preferably, the metering capacity increaser is a spherical bulging structure at the lower part of the metering tube.

[0050] The metering capacity increaser includes a plurality of different capacities, and a suitable metering tube is selected according to the capacity of the concentrated liquid.

[0051] Preferably, the metering capacity increaser is a spherical bulging structure at the lower part of the metering tube.

[0052] The capacity of the metering capacity increaser includes 10 mL, 20 mL, 30 mL, 50 mL, 100 mL and 200 mL, but is not limited thereto.

[0053] The capacity of the metering capacity increaser includes 1 mL, 2 mL, 3 mL, 5 mL, 10 mL and 20 mL, but is not limited thereto.

[0054] The heating assembly is an electric heating sleeve arranged at the outer wall of the distillation flask, which can be an electric heating belt or an electric heating furnace, preferably a movable electric heating furnace.

[0055] The shape of the movable electric heating furnace is adapted to the distillation flask.

[0056] Further, the electric heating furnace is preferably composed of two or three movable parts, and heating of the distillation flask is realized by cooperation of the parts.

[0057] Further, the movable electric heating furnace is preferably divided into two parts, namely an electric heating furnace I in the shape of a ring with holes and an electric heating furnace II in the shape of a spherical cap.

[0058] A temperature control instrument sensor probe is further arranged between the electric heating furnace and the distillation flask.

[0059] The rotary evaporator capable of accurately quantifying concentrated liquid has the ball-shaped bulging structure of the quantifying and expanding container arranged at the lower part of the quantifying tube and above the second liquid discharging valve, so that the machining of the quantifying assembly can be smoothly and quickly performed, thereby greatly saving the cost and facilitating the popularization and application of the technology.

[0060] The rotary evaporator capable of accurately quantifying concentrated liquid has the ball-shaped bulging structure of the quantifying and expanding container arranged at the lower part of the quantifying tube and above the second liquid discharging valve, so that the machining of the quantifying assembly can be smoothly and quickly performed, thereby greatly saving the cost and facilitating the popularization and application of the technology.

[0061] In addition, the application proposes that the quantifying tube is directly connected with the lower opening of the condenser, so that the collecting bottle is omitted, the structure of the rotary evaporator is simplified, the space is saved, the cost is further saved, and the reliability is increased.

[0062] The movable electric heating furnace provided by the application also improves the work efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0063] Figure 1 is a structural schematic view of the rotary evaporator of the embodiment 1 of the application;

[0064] Figure 2 is a structural schematic view of the rotary evaporator of the embodiment 2 of the application;

[0065] Figure 3 is a structural schematic view of the rotary evaporator of the embodiment 3 of the application;

[0066] Figure 4 is a structural schematic view of the rotary evaporator of the embodiment 4 of the application;

[0067] Figure 5 is a structural schematic view of the rotary evaporator of the embodiment 5 of the application;

[0068] Figure 6 is a structural schematic view of the rotary evaporator of the embodiment 6 of the application;

[0069] Figure 7 is a structural schematic view of the rotary evaporator of the embodiment 7 of the application;

[0070] The figure is marked: 1-stand, 2-distillation flask, 3-condenser, 4-collection bottle, 5-collection bottle liquid outlet, 6-the first liquid valve, 7-measuring tube, 8-measuring scale, 9-the second liquid valve, 10-motor, 11-distillation flask liquid outlet, 12-the first liquid valve, 13-measuring tube, 14-measuring scale, 15-the second liquid valve, 16-electric heating belt, 21-measuring expansion vessel, 22-measuring expansion vessel, 23-clip, 24-electric heating furnace, 25-electric heating furnace. DETAILED DESCRIPTION

[0071] In order to make the above-mentioned purpose, features and advantages of the present application more obvious and easy to understand, the present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0072] Example 1

[0073] Referring to Figure 1 The structure shown in the embodiment described can accurately measure the rotary evaporator of the fraction, comprising: a stand 1, the stand 1 is fixed with a detachable distillation flask 2 and a condenser 3, the distillation flask 2 is filled with a liquid to be distilled and heated by a heating assembly; the bottom of the condenser 3 is connected with a fraction quantitative assembly; the stand 1 is also provided with a motor 10 for controlling the rotation of the distillation flask 2 (the rotary evaporator of the present application can also be provided with a control panel for controlling the rotation speed and heating temperature, not shown in the figure), a lifting assembly for controlling the lifting of the distillation flask 2 and a control assembly for controlling the heating temperature, etc.

[0074] The heating assembly is a water (or oil) bath pot (or an electric heating belt wrapped around the distillation flask, or a movable electric heating furnace) arranged at the lower part of the distillation flask 2.

[0075] The condenser 3 is integrally formed with the fraction quantitative assembly, or the bottom opening of the condenser 3 is connected with the fraction quantitative assembly through a glass ball grinding opening and is fixed with a clip 23 (see Figure 2 ) for sealing connection;

[0076] The fraction quantitative assembly includes a measuring tube 7 with a measuring scale 8, a first liquid valve 6 and a second liquid valve 9, which are used to receive fractions, accurately measure and control the amount of fractions and discharge fractions;

[0077] The second liquid valve 9 is arranged at the bottom of the measuring tube 7, which is used to control the liquid discharge and sealing of the fraction;

[0078] The first liquid valve 6 is arranged at the bottom opening of the condenser, which is used to control and seal the discharge of the fraction.

[0079] As Figure 1The rotary evaporator shown in this embodiment has a measuring scale 8 on the outer wall of the measuring tube 7 for accurate measurement of the distillate. As an optional structure, the measuring tube 7 in this embodiment is a thin measuring tube with a measuring capacity of 2 mL, and its measuring scale is accurate to 0.02 mL. The second discharge valve 9 is made of polytetrafluoroethylene (PTFE).

[0080] As a transformable structure, such as Figure 1 As shown, a metering expansion container 22 is provided above the second discharge valve 9 at the lower part of the metering tube 7. This expansion container is used to increase the measurable capacity of the distillate when the capacity of the metering tube 7 is insufficient to meet the distillate volume requirement. This allows for a one-time discharge of the required amount of distillate, reducing errors caused by multiple readings due to multiple discharges and improving the accuracy of distillate measurement. The metering expansion container 22 works precisely with the metering tube 7 to expand its capacity. In this embodiment, the capacity of the metering expansion container 22 is set to 200.0 mL. Preferably, the metering expansion container 22 is a spherical bulge structure located above the second discharge valve at the lower part of the metering tube.

[0081] In the rotary evaporator described in this embodiment, at the start of distillation, the second discharge valve 9 is closed and the first discharge valve 6 is opened, so that the metering tube 7 still maintains a negative pressure state inside the distillation system. During the distillation process, when the fraction reaches the designed accurate amount, the first discharge valve 6 is immediately closed to stop distillation (adjust the rotation speed to 0 and turn off the heating switch), and the second discharge valve 9 is opened. At this time, the accurately measured fraction is released.

[0082] Example 2

[0083] See Figure 2 The structure shown in this embodiment differs from that in Embodiment 1 in that: a first drain valve 6 is provided at the lower opening of the condenser 3, and the first drain valve 6 is connected to the metering tube 7 through a glass ball joint and fixed with a clamp 23. The rest is the same as in Embodiment 1.

[0084] Example 3

[0085] See Figure 3 The structure shown in this embodiment differs from Embodiment 1 in that: the fraction metering component includes not only a metering tube 7 with metering graduations 8, a first discharge valve 6, and a second discharge valve 9, but also a collection bottle 4; a collection bottle discharge port 5 is formed at the bottom of the collection bottle 4, preferably formed at the lowest liquid level position of the collection bottle 4; a first discharge valve 6 is provided at the collection bottle discharge port 5; the metering tube 7 and the collection bottle discharge port 5 can be integrally formed or sealed together by a glass ground joint and fixed with a steel clip with screws to maintain the system's seal. See Embodiment 1 for the rest.

[0086] Example 4

[0087] Referring to Figure 4 As shown in the embodiment, the rotary evaporator for accurate quantitative concentration liquid comprises a support 1, a detachable distillation flask 2 and a condenser 3 fixed on the support 1, the distillation flask 2 containing a liquid to be distilled and heated by a heating assembly, the bottom of the condenser 3 being connected with a collection flask 4 for collecting distillate, and a motor 10 for controlling the rotation of the distillation flask 2 being arranged on the support (the rotary evaporator of the present application can also be provided with a control panel for controlling the parameters of the motor such as rotating speed and heating temperature, a control assembly for controlling the rotating speed and heating temperature, a vacuum pumping assembly, etc., which are not shown in the figure).

[0088] As shown in the rotary evaporator, Figure 4 the bottom of the distillation flask 2 (in the position of the working state of the distillation flask 2) is formed with a distillation flask liquid discharge port 11, which is preferably formed at the lowest liquid level position of the distillation flask 2, and a first liquid discharge valve 12 is arranged at the distillation flask liquid discharge port 11 for controlling the discharge of the concentrated liquid and sealing the distillation flask. The first liquid discharge valve 12 can be made of glass or polytetrafluoroethylene.

[0089] The rotary evaporator of the present embodiment further comprises a concentrated liquid quantitative assembly connected with the distillation flask liquid discharge port 11, which can realize accurate quantitative control of the concentrated liquid. The concentrated liquid quantitative assembly and the distillation flask liquid discharge port 11 can be integrally formed or connected by a glass ground joint, and a steel clamp with a screw is used for fixation to maintain the sealing of the system.

[0090] The concentrated liquid quantitative assembly of the present embodiment comprises a quantitative tube 13, a first liquid discharge valve 12 and a second liquid discharge valve 15, the outer wall of the quantitative tube 13 is provided with quantitative scale lines 14 for reading the value of the concentrated liquid, and the bottom of the quantitative tube 13 is provided with the second liquid discharge valve 15 for controlling the discharge and sealing of the concentrated liquid. As an alternative structure, the quantitative tube 13 is a measurable thin tube, and its measurable capacity is preferably 2 mL, and its measurement scale can be accurate to 0.02 mL. The second liquid discharge valve 15 can be made of glass or polytetrafluoroethylene.

[0091] As an alternative structure, as shown in the figure, Figure 4 a quantitative capacity increasing container 21 is arranged above the second liquid discharge valve 15 at the lower part of the quantitative tube 13, which is used for increasing the measurable capacity of the concentrated liquid, and thus realizing one-time discharge of the required amount of concentrated liquid and reducing the error caused by multiple readings due to multiple discharges. The quantitative capacity increasing container 21 and the quantitative tube 13 are matched by accurate measurement to realize the expansion of the quantitative tube 13. The capacity of the quantitative capacity increasing container 21 is 10 mL. The quantitative capacity increasing container 21 is preferably a spherical bulging structure above the second liquid discharge valve at the lower part of the quantitative tube.

[0092] like Figure 4 The rotary evaporator shown has an electric heating element 16 wrapped around the outer wall of the distillation flask 2. A fiberglass strip is also provided around the electric heating element 16 for heat insulation and to secure it. A temperature controller sensor probe is also installed between the electric heating element 16 and the outer wall of the distillation flask 2 to detect the heating temperature.

[0093] In this embodiment of the rotary evaporator, at the start of distillation, the second drain valve 15 is closed and the first drain valve 12 is opened, so that the distillation flask 2 still maintains a negative pressure state inside the distillation system. During distillation, the amount of concentrate is observed. When the amount of concentrate is close to the designed accurate amount, the rotation speed is slowed down to 0. When the amount of concentrate reaches the designed accurate amount, the first drain valve 12 is immediately closed to stop distillation (the heating switch is turned off), and the second drain valve 15 is opened. At this time, the accurately measured amount of concentrate is released.

[0094] Example 5

[0095] As a transformable structure, such as Figure 5 As shown, the rotary evaporator described in this embodiment, which can accurately quantify the concentrate and fraction, includes: a support 1, on which a detachable distillation flask 2 and a condenser 3 are fixed. The distillation flask 2 contains the liquid to be distilled and is heated by a heating component. A fraction quantification component is connected to the bottom of the condenser 3 for collecting the fraction. The support is also equipped with a motor 10 for controlling the rotation of the distillation flask 2 (the rotary evaporator of this invention also includes a control panel for controlling the rotation speed and heating temperature, as well as a control component for controlling the heating temperature, etc., which are not shown in the figure).

[0096] like Figure 5 As shown, the fraction dispensing assembly in this embodiment includes a metering tube 7 with a metering scale 8, a first discharge valve 6, and a second discharge valve 9. The second discharge valve 9 is located at the bottom of the metering tube 7 to control the discharge and sealing of the fraction. Alternatively, the metering tube 7 in this embodiment can be a thin, metering tube with a metering capacity of 1 mL and a metering scale accurate to 0.01 mL. The second discharge valve 9 can be made of polytetrafluoroethylene (PTFE).

[0097] As a transformable structure, such as Figure 5The rotary evaporator shown, the upper edge of the second liquid discharge valve 9 in the lower part of the metering tube 7 can be provided with a metering expansion vessel 22, when the capacity of the metering tube 7 cannot meet the need of the capacity of the fraction, increase the meterable capacity of the fraction, and achieve the required amount of fraction of one-time discharge, reduce the error due to multiple discharge needs multiple reading. The metering expansion vessel 22 and the metering tube 7 are connected through accurate metering, which realizes the expansion of the metering tube 7. The metering expansion vessel 22 of the present application includes a plurality of different capacities, and the capacity of the embodiment is 50ml, which realizes the one-time discharge of the fraction. The metering expansion vessel 22 can be the bulging structure of the lower part of the metering tube 7.

[0098] As shown in the figure, Figure 5 The bottom of the distillation flask 2 (in the position of the working state of the distillation flask 2) is formed with a distillation flask liquid discharge port 11, and is preferably formed at the lowest liquid level position of the distillation flask 2. The rotary evaporator of the present embodiment also includes a concentrated liquid quantitative assembly connected with the distillation flask liquid discharge port 11, for realizing the quantitative control of the concentrated liquid.

[0099] The concentrated liquid quantitative assembly includes a first liquid discharge valve 12 arranged at the distillation flask liquid discharge port 11, a quantitative tube 13 in airtight connection with the distillation flask liquid discharge port 11, and a second liquid discharge valve 15 arranged at the bottom of the quantitative tube 13. The first liquid discharge valve 12 is used for the discharge control of the concentrated liquid and the sealing of the distillation flask, and the material thereof is selected from glass or polytetrafluoroethylene; the quantitative scale line 14 provided on the outer wall of the quantitative tube 13 is used for the accurate quantitative of the concentrated liquid; and the second liquid discharge valve 15 is used for controlling the discharge and sealing of the concentrated liquid. The distillation flask liquid discharge port 11 and the quantitative tube 13 are in airtight connection through glass grinding, and are fixed by a clamp to maintain the sealing of the system. As an alternative structure, the quantitative tube 13 of the present embodiment can be a quantifiable thin tube, and the quantifiable capacity thereof is selected to be 1ml, and the metering scale thereof can be accurate to 0.01ml. The material of the second liquid discharge valve 15 is polytetrafluoroethylene or glass.

[0100] As an alternative structure, as shown in the figure, Figure 5 A quantitative expansion vessel 21 is arranged at the upper edge of the second liquid discharge valve 15 in the lower part of the quantitative tube 13, for increasing the quantifiable capacity of the concentrated liquid when the capacity of the quantitative tube 13 cannot meet the need of the capacity of the concentrated liquid, and thereby realizing the one-time discharge of the required amount of concentrated liquid, reducing the error due to multiple discharge needs multiple reading. The quantitative expansion vessel 21 and the quantitative tube 13 are connected through accurate metering, which realizes the expansion of the quantitative tube 13. The quantitative expansion vessel 21 of the present embodiment is selected to have a capacity of 10.0ml. The quantitative expansion vessel 21 is preferably a spherical bulging structure in the lower part of the quantitative tube 13.

[0101] As shown in the figure, Figure 5The rotating evaporator shown, the heating assembly is used for heating and evaporating the liquid to be distilled in the distillation flask 2, in this embodiment, the heating assembly is a movable electric heating furnace (a support is arranged under the furnace, the support is movable, and the distance between the electric heating furnace and the distillation flask 2 is adjusted), which is shaped to be matched with the distillation flask 2 and is divided into two parts, i.e., an electric heating furnace one 24 in the form of a ring sleeve with a hole and an electric heating furnace two 25 in the form of a spherical cap.

[0102] The movable electric heating furnace and the outer wall of the distillation flask 2 are further provided with a temperature control instrument sensor probe for detecting the heating temperature.

[0103] In the rotating evaporator, the second liquid discharge valve 9 and the second liquid discharge valve 15 are closed, the first liquid discharge valve 6 and the first liquid discharge valve 12 are opened at the beginning of distillation, so that the metering tube 7 and the metering tube 13 still maintain the negative pressure state inside the distillation system, the slight changes of the amount of distillate and the amount of concentrated liquid are observed during the distillation process, the rotating speed is slowed down to 0 when the amount of distillate and / or concentrated liquid approaches the designed accurate amount, the first liquid discharge valve 6 and / or the first liquid discharge valve 12 are closed immediately when the amount of distillate and / or concentrated liquid reaches the designed accurate amount, the distillation is stopped, and the second liquid discharge valve 9 and / or the second liquid discharge valve 15 are opened, at this time, the accurately quantified distillate and / or concentrated liquid is discharged.

[0104] Embodiment 6

[0105] Referring to Figure 6 The structure shown, the difference between this embodiment and embodiment 5 is that the heating assembly is an electric heating belt 16, and the rest is seen in embodiment 5.

[0106] Embodiment 7

[0107] Referring to Figure 7 The structure shown, the difference between this embodiment and embodiment 4 is that the heating assembly is a movable electric heating furnace, including an electric heating furnace one 24 and an electric heating furnace two 25, and the rest is seen in embodiment 4.

[0108] The above embodiments of the present application are described in detail, and the principles and implementation modes of the present application are described by applying specific examples; the above embodiment descriptions are only used to help understand the method of the present application and its core idea; meanwhile, for those skilled in the art, according to the idea of the present application, the specific implementation modes and application ranges will be changed, and the above description should not be understood as a limitation of the present application.

Claims

1. A rotary evaporator capable of accurately quantifying a concentrated solution, characterized by, Including support (1), the support (1) is fixed with detachable retort (2) and condenser (3), the retort (2) is heated by heating assembly, the bottom of the condenser (3) is connected with collection bottle (4); The bottom of the working position of the retort (2) is formed with a retort liquid outlet (11), which is connected with a concentrated liquid quantitative assembly, which can realize the transfer of substances from inside to outside under different pressure environments inside and outside the system without affecting the system, and can quantitatively control the amount of concentrated liquid and discharge the quantitative concentrated liquid. The concentrated liquid quantitative assembly includes a quantitative tube (13) with a quantitative scale line (14), a first liquid discharge valve (12) and a second liquid discharge valve (15), the second liquid discharge valve (15) is arranged at the bottom of the quantitative tube (13), for controlling the discharge and sealing of the concentrated liquid. The first liquid discharge valve (12) is arranged at the retort liquid outlet (11) to control the discharge of the concentrated liquid and seal the retort. The lower part of the quantitative tube (13) is further provided with a quantitative expansion vessel (21) on the second liquid discharge valve (15), for quantitative expansion, so as to realize one-time quantitative discharge of the concentrated liquid. The quantitative expansion vessel (21) is a spherical bulging structure on the quantitative tube (13). The heating assembly is an electric heating sleeve arranged on the outer wall of the retort (2), and a temperature controller sensor probe is further arranged between the electric heating sleeve and the retort (2). The electric heating sleeve is an electric heating furnace. The electric heating furnace is movable and matched with the retort (2). The electric heating furnace is divided into two or three movable parts, and the heating of the retort (2) is realized by cooperation of the parts. The electric heating furnace is provided with a support below, which is movable.

2. A rotary evaporator capable of accurate quantification of a concentrate and a fraction, characterized in that, Including support (1), the support (1) is fixed with detachable retort (2) and condenser (3), the retort (2) is heated by heating assembly, the bottom of the condenser (3) is connected with fraction quantitative assembly; The bottom of the working position of the retort (2) is formed with a retort liquid outlet (11), which is connected with a concentrated liquid quantitative assembly, which realizes accurate quantitative control of the concentrated liquid. The fraction quantitative assembly can realize the transfer of substances from inside to outside under different pressure environments inside and outside the system without affecting the system. The fraction quantitative assembly can accommodate fractions, accurately measure and control the amount of fractions and discharge fractions. The concentrated liquid quantitative assembly includes a quantitative tube (13) with a quantitative scale line (14), a first liquid discharge valve (12) and a second liquid discharge valve (15); the second liquid discharge valve (15) is arranged at the bottom of the quantitative tube (13), for controlling the discharge and sealing of the concentrated liquid. The first liquid discharge valve (12) is arranged at the retort liquid outlet (11) to control the discharge of the concentrated liquid and seal the retort. The heating assembly is an electric heating sleeve arranged on the outer wall of the retort (2); The electric heating sleeve and the retort (2) are further provided with a temperature controller sensor probe therebetween. The fraction quantitative assembly comprises a metering tube (7) with metering scale (8), a first liquid discharge valve (6) and a second liquid discharge valve (9); the second liquid discharge valve (9) is arranged at the bottom of the metering tube (7) and is used for controlling the discharge and sealing of the fraction; The bottom of the condenser (3) is provided with a first liquid discharge valve (6) for controlling the discharge of the fraction and sealing; The electric heating jacket is an electric heating furnace; The electric heating furnace is movable and is matched with the distillation flask (2); The electric heating furnace is divided into two or three movable parts and is used for heating the distillation flask (2) through cooperation of the parts; The electric heating furnace is provided with a support which is movable.

3. The rotary evaporator capable of accurately quantifying concentrated liquid and fraction according to claim 2, characterized in that: The lower part of the quantitative tube (13) is further provided with a quantitative expansion container (21) above the second liquid discharge valve (15) and is used for realizing one-time quantitative expansion and discharge of the concentrated liquid; The quantitative expansion container (21) is a spherical bulging structure on the quantitative tube (13); The lower part of the metering tube (7) is further provided with a metering expansion container (22) above the second liquid discharge valve (9) and is used for quantitative expansion, thereby realizing one-time quantitative discharge of the fraction; The metering expansion container (22) is a spherical bulging structure on the metering tube (7).

4. The rotary evaporator capable of accurately quantifying a concentrate and a fraction according to claim 2, wherein The fraction quantitative assembly comprises a collection bottle (4), a metering tube (7) with metering scale (8), a first liquid discharge valve (6) and a second liquid discharge valve (9); the second liquid discharge valve (9) is arranged at the bottom of the metering tube (7) and is used for controlling the discharge and sealing of the fraction; The bottom of the collection bottle (4) is provided with a collection bottle discharge port (5), and the collection bottle discharge port (5) is provided with a first liquid discharge valve (6) for controlling the discharge of the fraction and sealing.

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