CN113750558A - Operation method of two-stage short-path molecular distillation device - Google Patents

Abstract

An inner tank is arranged in a shell, the shell and the inner tank form a shell, a heating mechanism is arranged between the shell and the inner tank, a vacuumizing tube is arranged on one side of the top end of the shell, a feeding tube is arranged on the other side of the top end of the shell, a motor is arranged in the middle of the top end of the shell, a heavy phase outlet is arranged on one side of the lower end of the shell, a light phase outlet is arranged at the bottom of the shell, a material distribution mechanism is arranged at the upper end in a condenser shell vertically arranged in the middle of the inner bottom surface of the shell, a scraping plate mechanism is arranged below the material distribution mechanism, a transmission shaft is arranged between the motor and the scraping plate mechanism, and the motor drives the scraping plate mechanism to rotate through the transmission shaft; the first scraper and the second scraper are integrated into one set of equipment, so that the secondary distillation time is shortened, the requirement on high vacuum can be easily realized, the product quality is improved, and the investment cost and the distillation cost of enterprises are greatly reduced.

Description

Operation method of two-stage short-path molecular distillation device

Technical Field

The invention relates to the field of refined lactic acid production equipment, in particular to an operation method of a two-stage short-path molecular distillation device.

Background

The lactic acid is a fine chemical product of food chemical industry, and the preparation process comprises the steps of taking corn or potato starch and calcium carbonate as main raw materials, adding microbial strains, fermenting and filtering the mixture to obtain calcium lactate liquid, carrying out concentration, acidolysis and other processes, filtering out calcium sulfate, separating to obtain industrial-grade crude lactic acid, and finally refining and purifying the industrial-grade crude lactic acid by a physical or chemical method to obtain the finished product lactic acid. In the prior art, there are many refining methods for industrial grade crude lactic acid, such as calcium lactate crystallization, esterification, extraction, ion exchange activated carbon decolorization, distillation, etc., wherein the crystallization method has complicated steps; the esterification method and the extraction method introduce organic solvents, and are not suitable for producing food-grade and pharmaceutical-grade lactic acid; the ion exchange activated carbon decolorization method has problems in the preparation and regeneration of separating agents; the distillation method is a physical purification method, especially short-path distillation and molecular distillation are novel distillation technologies appearing in recent years, at present, the treatment capacity of the existing short-path molecular distillation in the market is small, multiple sets of short-path molecular distillation equipment are needed for twice purification of lactic acid to meet the product requirement, the investment cost of enterprises is greatly improved, and the energy consumption of the equipment is high.

In view of the above, a method of operating a two-stage short path molecular distillation apparatus has been developed.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provide an operation method of a two-stage short-path molecular distillation device, wherein a first scraper and a second scraper are integrated into a set of equipment, so that the time of secondary distillation is shortened, the requirement on high vacuum can be easily met, the product quality is improved, and the investment cost and the distillation cost of enterprises are greatly reduced.

In order to achieve the purpose, the invention adopts the following technical scheme: a method of operating a two-stage short-path molecular distillation apparatus, said two-stage short-path molecular distillation apparatus comprising: the device comprises a shell, an inner tank, a heating mechanism, a vacuum tube, a motor, a feeding pipe, a distributing pipe, a liquid separating disc, a transmission shaft, a light phase outlet, a rotary disc, a support plate, a first scraper plate, a second scraper plate, a screw, a spring, a condenser and a heavy phase outlet; an inner tank is arranged in the shell, the shell and the inner tank form a shell, a heating mechanism is arranged between the shell and the inner tank, one side of the top end of the shell is provided with a vacuum-pumping tube, the other side of the top end of the shell is provided with a feeding tube, the middle part of the top end of the shell is provided with a motor, one side of the lower end of the shell is provided with a heavy phase outlet, the bottom of the shell is provided with a light phase outlet, the middle part of the inner bottom surface of the shell is vertically provided with a material distribution mechanism at the upper end in the condenser shell, a scraping plate mechanism is arranged below the material distribution mechanism, a transmission shaft is arranged between the motor and the scraping plate mechanism, and the motor drives the scraping plate mechanism to rotate through the transmission shaft;

the scraper mechanism is structurally characterized in that: at least two vertical extension boards of carousel lower surface evenly distributed, the extension board outside sets gradually first scraper blade, second scraper blade from top to bottom, sets up the connecting plate between first scraper blade and the extension board, sets up the screw rod between second scraper blade and the extension board, and the front end of screw rod is fixed to be set up on the second scraper blade, and the rear end of screw rod sets up limit nut after passing the preformed hole on the extension board, overlaps on the screw rod between second scraper blade and the extension board and establishes the spring, first scraper blade and second scraper blade be arc.

The structure of the material distribution mechanism is as follows: the upper end in the shell is provided with a circular distributing pipe which is communicated with the feeding pipe, the distributing pipe is evenly provided with discharge ports, a conical liquid separating disc is arranged below the distributing pipe, the lower end of the transmission shaft penetrates through the liquid separating disc, and the transmission shaft drives the liquid separating disc to rotate.

The distance between the first scraper and the inner tank is 0.4-1mm, the distance between the second scraper 14 and the inner tank 2 is 0.1-0.4mm, and splash shields are arranged on one sides of the first scraper and the second scraper.

The bottom surface in the shell is an inclined surface, and the lower end of the bottom surface extends to the heavy phase outlet.

Firstly, connecting the device with other devices to form a complete device, debugging, starting to use, starting a heating mechanism to heat the device, raising the temperature to a proper temperature, then sending the raw materials into a material distribution pipe through a feeding pipe to start distribution, uniformly distributing the raw materials on a liquid distribution disc by a circular ring-shaped material distribution pipe, simultaneously starting a motor, driving the liquid distribution disc and a scraping plate mechanism to rotate by the motor through a transmission shaft, uniformly throwing the materials on the liquid distribution disc onto the inner wall of an inner tank under the action of centrifugal force and flowing downwards along the inner wall of the inner tank, uniformly distributing the raw materials on the wall surface of the inner tank into a liquid film with a certain thickness by a first scraping plate, separating light and heavy components of the raw materials on the inner tank by the heating mechanism, then condensing the light components into liquid by a condenser, downwards flowing along the condenser and discharging from a light phase outlet, and downwards flowing along the inner wall of the inner tank, the second scraper blade becomes very thin liquid film with the homogeneous distribution of heavy ends to better volatilize the volatile material in the heavy ends, in order to reach better separation effect, realize the secondary distillation, light ends after the secondary distillation flows down along the condenser after the condenser condensation becomes liquid and discharges from the export of light phase, and the heavy ends flows down along the inner wall of inner tank, is discharged by the export of heavy phase.

The invention has the beneficial effects that: the first scraper and the second scraper are integrated into one set of equipment, so that the secondary distillation time is shortened, the requirement on high vacuum can be easily realized, the product quality is improved, and the investment cost and the distillation cost of enterprises are greatly reduced; the invention is described in detail in the prior art.

Drawings

The invention will be further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of the assembly structure;

in the figure: the device comprises a shell 1, an inner tank 2, a heating mechanism 3, a vacuumizing pipe 4, a motor 5, a feeding pipe 6, a distributing pipe 7, a liquid separating disc 8, a transmission shaft 9, a light phase outlet 10, a rotary disc 11, a support plate 12, a first scraper 13, a second scraper 14, a screw 15, a spring 16, a condenser 17 and a heavy phase outlet 18.

Detailed Description

The present invention will be described in further detail with reference to the following examples and embodiments:

example 1

An inner tank 2 is arranged in a shell 1, the shell 1 and the inner tank 2 form a shell, a heating mechanism 3 is arranged between the shell 1 and the inner tank 2, a vacuumizing tube 4 is arranged on one side of the top end of the shell, a feeding tube 6 is arranged on the other side of the top end of the shell, a motor 5 is arranged in the middle of the top end of the shell, a heavy phase outlet 18 is arranged on one side of the lower end of the shell, a light phase outlet 10 is arranged at the bottom of the shell, a condenser 17 is vertically arranged in the middle of the inner bottom surface of the shell, a distributing mechanism is arranged at the upper end in the shell, a scraping plate mechanism is arranged below the distributing mechanism, a transmission shaft 9 is arranged between the motor 5 and the scraping plate mechanism, and the motor 5 drives the scraping plate mechanism to rotate through the transmission shaft 9;

the scraper mechanism is structurally characterized in that: at least two vertical extension boards 12 are evenly distributed on the lower surface of the turntable 11, a first scraper 13 and a second scraper 14 are sequentially arranged on the outer side of the extension board 12 from top to bottom, a connecting plate is arranged between the first scraper 13 and the extension board 12, a screw rod 15 is arranged between the second scraper 14 and the extension board 12, the front end of the screw rod 15 is fixedly arranged on the second scraper, a limit nut is arranged after the rear end of the screw rod 15 penetrates through a reserved hole in the extension board 12, a spring 16 is sleeved on the screw rod 15 between the second scraper 14 and the extension board 12, and the first scraper 13 and the second scraper 14 are both arc-shaped.

Example 2

The structure of the material distribution mechanism is as follows: the upper end in the casing sets up annular distributing pipe 7, and distributing pipe 7 communicates with each other with inlet pipe 6, evenly distributed discharge gate on the distributing pipe 7, and the below of distributing pipe 7 sets up conical liquid separation dish 8, and the lower extreme of transmission shaft 9 passes liquid separation dish 8, and transmission shaft 9 drives liquid separation dish 8 and rotates.

Example 3

The distance between the first scraper 13 and the inner tank 2 is 0.4-1mm, the distance between the second scraper 14 and the inner tank 2 is 0.1-0.2mm, and splash-proof plates are arranged on one sides of the first scraper 13 and the second scraper 14.

Example 4

The bottom surface in the housing is an inclined surface, and the lower end of the bottom surface extends to the heavy phase outlet 18.

Example 5

Firstly, the device is connected with other devices to form a complete device, then debugging is carried out, the device is used, a heating mechanism is started to heat the device, the temperature is raised to a proper temperature, then raw materials are sent into a distributing pipe 7 through a feeding pipe 6 to start distribution, the raw materials are uniformly distributed on a liquid distribution disc 8 by the circular distributing pipe 7, a motor 5 is started at the same time, the motor 5 drives the liquid distribution disc 8 and a scraping plate mechanism to rotate through a transmission shaft 9, materials on the liquid distribution disc 8 are uniformly thrown onto the inner wall of an inner tank 2 under the action of centrifugal force when the liquid distribution disc 8 rotates and flow downwards along the inner wall of the inner tank 2, a first scraping plate 13 uniformly distributes the raw materials on the wall surface of the inner tank 2 into a liquid film with a certain thickness, the heating mechanism 3 enables the raw materials on the inner tank 2 to realize light and heavy component separation, then the light components are condensed and condensed into liquid by a condenser 17 and then flow downwards along the condenser 17 to be discharged from a light phase outlet 9, heavy component flows down along the inner wall of inner tank 2, and second scraper 14 becomes very thin liquid film with the even distribution of heavy component to better volatilize the volatile material in the heavy component, in order to reach better separation effect, realize the secondary distillation, light component after the secondary distillation flows down along condenser 17 after condenser 17 condensation becomes liquid and discharges from light phase export 9, and the heavy component flows down along the inner wall of inner tank 2, is discharged by heavy phase export 18.

Claims (5)

1. A method of operating a two-stage short-path molecular distillation apparatus, said two-stage short-path molecular distillation apparatus comprising: the device comprises a shell (1), an inner tank (2), a heating mechanism (3), a vacuumizing pipe (4), a motor (5), a feeding pipe (6), a distributing pipe (7), a liquid separating disc (8), a transmission shaft (9), a light phase outlet (10), a rotary disc (11), a support plate (12), a first scraper (13), a second scraper (14), a screw (15), a spring (16), a condenser (17) and a heavy phase outlet (18); the method is characterized in that: an inner tank (2) is arranged in a shell (1), the shell (1) and the inner tank (2) form a shell, a heating mechanism (3) is arranged between the shell (1) and the inner tank (2), a vacuumizing pipe (4) is arranged on one side of the top end of the shell, a feeding pipe (6) is arranged on the other side of the top end of the shell, a motor (5) is arranged in the middle of the top end of the shell, a heavy phase outlet (18) is arranged on one side of the lower end of the shell, a light phase outlet (10) is arranged at the bottom of the shell, a condenser (17) is vertically arranged in the middle of the bottom surface of the shell, a material distribution mechanism is arranged at the upper end in the shell, a scraping plate mechanism is arranged below the material distribution mechanism, a transmission shaft (9) is arranged between the motor (5) and the scraping plate mechanism, and the motor (5) drives the scraping plate mechanism to rotate through the transmission shaft (9);

the scraper mechanism is structurally characterized in that: carousel (11) lower surface evenly distributed two piece at least vertical extension board (12), the extension board (12) outside sets gradually first scraper blade (13), second scraper blade (14) from top to bottom, set up the connecting plate between first scraper blade (13) and the extension board (12), set up screw rod (15) between second scraper blade (14) and the extension board (12), the front end of screw rod (15) is fixed to be set up on the second scraper blade, set up limit nut after the rear end of screw rod (15) passes the preformed hole on extension board (12), screw rod (15) between second scraper blade (14) and extension board (12) are gone up the cover and are established spring (16), first scraper blade (13) and second scraper blade (14) be arc.

2. A method of operating a two-stage short path molecular distillation apparatus according to claim 1, wherein: the structure of the material distribution mechanism is as follows: the upper end in the casing sets up annular distributing pipe (7), and distributing pipe (7) communicate with each other with inlet pipe (6), evenly distributed discharge gate on distributing pipe (7), and the below of distributing pipe (7) sets up conical liquid distribution dish (8), and liquid distribution dish (8) are passed to the lower extreme of transmission shaft (9), and transmission shaft (9) drive liquid distribution dish (8) rotate.

3. A method of operating a two-stage short path molecular distillation apparatus according to claim 1, wherein: the distance between the first scraper (13) and the inner tank (2) is 0.4-1mm, the distance between the second scraper (14) and the inner tank (2) is 0.1-0.2mm, and splash-proof plates are arranged on one sides of the first scraper (13) and the second scraper (14).

4. A method of operating a two-stage short path molecular distillation apparatus according to claim 1, wherein: the bottom surface in the shell is an inclined surface, and the lower end of the bottom surface extends to a heavy phase outlet (18).

5. A method of operating a two-stage short path molecular distillation apparatus according to claim 1, wherein: firstly, the device is connected with other devices to form a complete device, then debugging is carried out, the device is used, a heating mechanism is started to heat the device, the temperature is raised to a proper temperature, then raw materials are sent into a distribution pipe (7) through a feeding pipe (6) to be sprayed, the raw materials are uniformly distributed on a liquid distribution disc (8) by a circular distribution pipe (7), a motor (5) is started at the same time, the motor (5) drives the liquid distribution disc (8) and a scraping plate mechanism to rotate through a transmission shaft (9), the materials on the liquid distribution disc (8) are uniformly thrown onto the inner wall of an inner tank (2) due to the effect of centrifugal force when the liquid distribution disc (8) rotates and flow downwards along the inner wall of the inner tank (2), a first scraping plate (13) uniformly distributes the raw materials on the wall surface of the inner tank (2) into a liquid film with a certain thickness, and the heating mechanism (3) enables the raw materials on the inner tank (2) to realize light-heavy component separation, then the light component is condensed into liquid by the condenser (17) and then flows downwards along the condenser (17) to be discharged from the light phase outlet 9, the heavy component flows downwards along the inner wall of the inner tank (2), the second scraper blade (14) uniformly distributes the heavy component into a thin liquid film, so that volatile substances in the heavy component are volatilized better to achieve a better separation effect and realize secondary distillation, the light component after the secondary distillation flows downwards along the condenser (17) to be discharged from the light phase outlet 9 after being condensed into liquid by the condenser (17), and the heavy component flows downwards along the inner wall of the inner tank (2) to be discharged by the heavy phase outlet (18).

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