CN216497556U - Rectification system - Google Patents

Abstract

The utility model relates to the technical field of rectification, and discloses a rectification system which comprises a rectification kettle, a tower column, a cooler, a collection tank and a fraction tank, wherein a heater and a feed opening are arranged on the rectification kettle, the heater is in heat conduction with the rectification kettle, the bottom end of the tower column is communicated with the top end of the rectification kettle, the top end of the tower column is communicated with the cooler, a collection pipeline is connected between the cooler and the collection tank, a collection valve is arranged on the collection pipeline, a reflux pipeline is connected between the bottom end of the collection tank and the tower column, a reflux valve is arranged on the reflux pipeline, a collection pipeline is connected between the fraction tank and the collection tank, and a discharge valve is arranged on the collection pipeline. Through be in the bottom of holding vessel with set up the return line between the column, impurity in the holding vessel can both be followed return line and returned the column, and fraction in the holding vessel becomes the full reflux mode from partial reflux for the fraction obtains fully purifying.

Description

Rectification system

Technical Field

The utility model relates to the technical field of rectification, in particular to a rectification system.

Background

The rectifying tower is a tower-type vapor-liquid contact device for rectifying, steam enters from the bottom of the tower, a vapor phase evaporated from the steam is in countercurrent contact with descending liquid, in the two-phase contact, volatile components (with low boiling points) in the descending liquid are continuously transferred to the vapor phase, and nonvolatile components (with high boiling points) in the vapor phase are continuously transferred to the descending liquid, the more the vapor phase is close to the top of the tower, the higher the concentration of the volatile components is, and the more the descending liquid is close to the bottom of the tower, the more the nonvolatile components are enriched, so that the purpose of separating the components is achieved; on the other hand, when collected fractions are refluxed, the fractions in the collection tank need to be refluxed into the rectifying tower by virtue of a delivery pump, and due to insufficient reflux, the impurity content in the product is high, and the purity of the product is unstable; or the product can be qualified only by secondary rectification and purification, so that the production efficiency is reduced.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: the existing rectifying tower has insufficient reflux and unstable purity.

In order to solve the technical problem, the utility model provides a rectification system which comprises a rectification kettle, a tower column, a cooler, a collecting tank and a fraction tank, wherein the rectification kettle is provided with a heater and a feed port, the heater is in heat conduction with the rectification kettle, the bottom end of the tower column is communicated with the top end of the rectification kettle, the top end of the tower column is communicated with the cooler, a collecting pipeline is connected between the cooler and the collecting tank, the collecting pipeline is provided with a collecting valve, a backflow pipeline is connected between the bottom end of the collecting tank and the tower column, the backflow pipeline is provided with a backflow valve, a discharge pipeline is connected between the fraction tank and the collecting tank, and the discharge pipeline is provided with a discharge valve.

Further, the return conduit is lower than the collection conduit.

Further, the height difference between the high-level section of the backflow pipeline and the collecting pipeline is 14-18 cm.

Furthermore, a temperature measuring port is arranged on the rectifying still.

Furthermore, a filler wire mesh is arranged in the tower column and is 55-65 meshes.

Further, the cooler comprises a containing tank and a liquid cooling circulating pipe, the containing tank is communicated with the tower column and the collecting pipeline respectively, and the liquid cooling circulating pipe penetrates through the containing tank.

Further, the height of the tower column is 3-5 m, and the inner diameter of the tower column is 12-14 cm.

Further, the heater comprises a shell and a heating rod, the shell is sleeved outside the rectifying kettle, heat conduction oil is filled in the shell, and the heating rod is located in the shell.

Compared with the prior art, the rectification system provided by the embodiment of the utility model has the beneficial effects that: through the bottom of the collection tank with set up the backflow pipeline between the column, impurity in the collection tank can both return to the column from the backflow pipeline, and fraction in the collection tank becomes the full reflux mode from partial reflux for the fraction obtains fully purifying.

Drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

In the figure, 1, a rectifying still; 11. a heater; 12. a feeding port; 13. a temperature measuring port; 2. a tower column; 3. a cooler; 31. a holding tank; 32. a liquid cooling circulation pipe; 4. a collection tank; 41. a collection pipe; 42. a collection valve; 43. a return line; 44. a reflux valve; 45. a discharge valve; 46. a discharge pipe; 5. and a fraction tank.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the present invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc., used herein to indicate the orientation or positional relationship, are based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention.

As shown in fig. 1, a rectification system according to a preferred embodiment of the present invention is used for purifying propofol, and comprises a rectifying still 1, a column 2, a cooler 3, a collection tank 4 and a fraction tank 5.

The distillation kettle 1 is provided with a heater 11 and a feed port 12, the feed port 12 is used for adding materials to be reacted, the heater 11 is in heat conduction with the distillation kettle 1, when the materials in the distillation kettle 1 react, the heater 11 can heat the materials in the distillation kettle 1, the bottom end of the tower column 2 is communicated with the top end of the distillation kettle 1, the top end of the tower column 2 is communicated with the cooler 3, a filler wire mesh is arranged in the tower column 2, and the filler wire mesh is 55-65 meshes. Gas generated by the material in the rectifying still 1 passes through the tower column 2 and then reaches the cooler 3, and is cooled by the cooler 3 and then becomes liquid. A collecting pipe 41 is connected between the cooler 3 and the collecting tank 4, and the liquid cooled by the cooler 3 flows to the collecting tank 4 through the collecting pipe. The collecting pipe 41 is provided with a collecting valve 42, and the collecting valve 42 can control the opening and closing of the collecting pipe 41 and the flow rate. The bottom of collection tank 4 with be connected with backflow pipeline 43 between the column 2, be located in the collection tank 4 in the heavier liquid in bottom can flow back to the column 2 through backflow pipeline 43, be equipped with return valve 44 on the backflow pipeline 43, the switching and the size of flow of backflow pipeline 43 can be controlled to return valve 44. A discharge pipeline 46 is connected between the fraction tank 5 and the collecting tank 4, when the purity of the propofol collected by the collecting tank 4 meets the requirement, the purified propofol can be conveyed to the fraction tank 5 through the discharge pipeline 46, a discharge valve 45 is arranged on the discharge pipeline 46, and the discharge valve 45 can control the opening and closing of the discharge pipeline 46.

The reflux pipeline 43 is lower than the collecting pipeline 41, and since the liquid at the top in the collecting tank 4 is relatively pure in the process of purifying propofol, the liquid component at the bottom in the collecting tank 4 is not very pure and has a density higher than that of the liquid at the top of the collecting tank 4, after the liquid propofol flows into the collecting tank 4 from the collecting pipeline 41, the heavy component in the liquid propofol will fall to the reflux pipeline 43, and then flows back to the column 2 through the reflux pipeline 43.

The height difference between the high-level section of the return pipeline 43 and the collecting pipeline 41 is 14-18 cm, preferably, the height difference between the high-level section of the return pipeline 43 and the collecting pipeline 41 is 16cm, the height difference between the high-level section of the return pipeline 43 and the collecting pipeline 41 is limited within the range, the height difference between the high-level section of the return pipeline 43 and the collecting pipeline 41 can be increased, the gravity action of fractions is increased, the fraction collecting and returning speed is increased, the returning efficiency of materials in unit time is increased, the purity of the fractions is improved, impurities in the fractions are greatly reduced, the range ensures that the liquid at the top of the collecting tank 4 has enough gravity to press the liquid at the bottom back to the return pipeline 43, and the phenomenon that the liquid pressure in the return pipeline 43 is too large due to too large height difference is avoided.

Be equipped with temperature measurement mouth 13 on rectifying still 1, temperature measurement mouth 13 is used for detecting rectifying still 1's reaction temperature, makes things convenient for the staff to monitor rectifying still 1's reaction temperature, temperature measurement mouth 13 can be temperature sensor. The heater 11 comprises a shell and a heating rod, the shell is sleeved outside the rectifying kettle 1, heat conducting oil is filled in the shell, the heating rod is located in the shell, the heating rod heats the heat conducting oil, and the heat conducting oil uniformly transfers heat to the rectifying kettle 1.

The cooler 3 comprises a containing tank 31 and a liquid cooling circulation pipe 32, the containing tank 31 is respectively communicated with the tower column 2 and the collecting pipeline 41, and the liquid cooling circulation pipe 32 penetrates through the containing tank 31. After passing through the column 2, the gas generated in the rectifying still 1 contacts the liquid-cooled circulation pipe 32 in the storage tank 31, and is cooled by the liquid-cooled circulation pipe 32 to become liquid, and the liquid flows into the collection pipe 41 again. Wherein, liquid cooling circulating pipe 32 can external water pump and radiator to form a liquid cooling system, only need to let in the coolant liquid in liquid cooling circulating pipe 32, can utilize the liquid cooling system to cool down the gas in the holding tank 31.

The height of the tower column 2 is 3-5 meters, the inner diameter of the tower column 2 is 12-14 cm, preferably, the height of the tower column 2 is 4 meters, the inner diameter of the tower column 2 is 13cm, and the tower column 2 is designed in the size, so that gas generated by the rectifying still 1 can be fully contacted with the packing in the tower column 2, and the gas cannot be liquefied and fall back to the rectifying still 1 due to the fact that the tower column 2 is too high.

The working process of the utility model is as follows: putting the material into the rectifying still 1 from the feeding port 12, vacuumizing the space in the rectifying still 1, heating the rectifying still 1 by the heater 11, boiling the material in the rectifying still 1 when the material reaches a certain temperature under negative pressure, lifting the gas generated by the material to the cooler 3 through the tower column 2, cooling the gas by the cooler 3, converting the gas into liquid, flowing to the collecting tank 4 through the collecting pipeline 41, opening the reflux valve 44 when the liquid in the collecting tank 4 reaches a certain height, making the liquid in the collecting tank 4 flush with the high-level section of the reflux pipeline 43, wherein the impure liquid falls due to gravity and flows back to the tower column 2 from the reflux pipeline 43 at the bottom end of the collecting tank 4, the impure liquid contacts and exchanges with the gas in the tower column 2, the heavy component falls into the rectifying still 1, the light component rises to the cooler 3 again, flows to the collecting tank 4 after being cooled by the cooler 3, the high-purity fraction is obtained by the circulation.

To sum up, the embodiment of the present invention provides a rectification system, wherein a reflux pipeline 43 is disposed between the bottom end of the collection tank 4 and the column 2, impurities in the collection tank 4 can all return to the column 2 from the reflux pipeline 43, and the fraction in the collection tank 4 is changed from partial reflux to full reflux, so that the fraction is sufficiently purified; when the fraction collected by the collection tank 4 reaches a certain height, the fraction in the collection tank 4 is subjected to total reflux at the bottom end of the collection tank 4 due to gravity and is continuously subjected to circulating exchange with gas in the column 2, so that the vapor-liquid phase exchange speed of the fraction in unit time is increased, the purity of the fraction is increased, and compared with the conventional propofol purification technology, the purity of the fraction is increased from 90% to 99%, and the impurity is mainly controlled to be reduced from 0.5% to 0.2%.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims (8)

1. A rectification system, comprising: rectifying still, column, cooler, collecting vessel and fraction jar, be equipped with heater and dog-house on the rectifying still, the heater with rectifying still heat-conduction, the bottom of column with rectifying still's top is linked together, the top of column with the cooler is linked together, the cooler with be connected with the collecting tube between the collecting vessel, be equipped with the collection valve on the collecting tube, the bottom of collecting vessel with be connected with the backflow pipeline between the column, be equipped with the reflux valve on the backflow pipeline, the fraction jar with be connected with the baiting pipeline between the collecting vessel, be equipped with the baiting valve on the baiting pipeline.

2. The rectification system of claim 1, wherein: the return conduit is lower than the collection conduit.

3. The rectification system of claim 2, wherein: the height difference between the high-level section of the backflow pipeline and the collecting pipeline is 14-18 cm.

4. The rectification system of claim 1, wherein: and a temperature measuring port is arranged on the rectifying kettle.

5. The rectification system of claim 1, wherein: and a filler wire mesh is arranged in the tower column and is 55-65 meshes.

6. The rectification system of claim 1, wherein: the cooler comprises a containing tank and a liquid cooling circulating pipe, the containing tank is communicated with the tower column and the collecting pipeline respectively, and the liquid cooling circulating pipe penetrates through the containing tank.

7. The rectification system of claim 1, wherein: the height of the tower column is 3-5 m, and the inner diameter of the tower column is 12-14 cm.

8. The rectification system of claim 1, wherein: the heater comprises a shell and a heating rod, the shell is sleeved outside the rectifying kettle, heat conduction oil is filled in the shell, and the heating rod is located in the shell.

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