Fractionation device for extracting normal hexane and isohexane from crude hexane

Abstract

The utility model relates to the technical field of fractionation devices, and discloses a fractionation device for extracting n-hexane and isohexane from crude hexane, which comprises a support, the inner side of the support is fixedly connected with a heating storage bin, according to the fractionation device for extracting n-hexane and isohexane from crude hexane, the n-hexane is heated to a boiling point and vaporized in a secondary heating bin, and the n-hexane is separated from the heating storage bin. Then normal hexane is discharged through a discharge pipe, residual liquid in the last group of cooling bins passes through a filter block and is discharged through a waste discharge pipe, but when the residual liquid passes through a connecting hopper, the liquid flows down in a vortex shape due to the hopper-shaped connecting hopper and a flow guide plate and then impacts the surface of a transmission plate; a transmission plate is impacted by the liquid to drive a rotating block to rotate, and the rotating block drives a rotating rod to rotate together, so that the rotating rod drives a wiping ring and a brush rod to rotate, a filtering block is cleaned, some impurities are prevented from remaining on the inner wall of the cooling bin, and the filtering effect of the filtering block on the liquid can also be ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fractionation devices, in particular to a fractionation device for extracting normal hexane and isohexane from crude hexane. Background Art

[0002] A fractionation device for extracting normal hexane and isohexane from crude hexane belongs to the field of chemical production technology. The device comprises a normal pressure drying tower, a normal pressure fractionation tower, a reduced pressure drying tower, a reduced pressure fractionation tower and a storage tank connected in sequence, wherein a first heat exchanger is arranged between the normal pressure drying tower and the normal pressure fractionation tower, and a second heat exchanger is arranged between the normal pressure fractionation tower and the reduced pressure drying tower, and the first heat exchanger and the second heat exchanger are both used to recover the heat of the gas at the top of the tower to preheat the materials entering the normal pressure drying tower and the reduced pressure drying tower respectively. The mass fraction of hexane in the normal hexane product extracted by the device of the utility model can reach more than 98.9%, the mass fraction of normal hexane can reach more than 96%, and the mass fraction of isohexane is less than or equal to 4.0%; the total mass fraction of isohexane products can reach more than 90%, the mass fraction of normal hexane is less than or equal to 10%, and the mass fraction of isohexane can reach more than 80%.

[0003] However, when separating crude hexane, due to the different boiling points of n-hexane and isohexane, crude hexane needs to be fractionated forward and backward, and finally the vaporized waste liquid will be discharged through a cooling device. However, some impurities will remain in the waste liquid, which may cause it to adhere to the inner wall of the cooling bin and affect the final discharge of isohexane. Summary of the invention

[0004] The utility model aims to provide a fractionation device for extracting normal hexane and isohexane from crude hexane, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a fractionation device for extracting normal hexane and isohexane from crude hexane, comprising a bracket, a heating storage bin is fixedly connected to the inner side of the bracket, a liquid inlet pipe is passed through and fixedly connected to the top surface of the heating storage bin, and a liquid guide pipe is passed through and fixedly connected to the bottom of the heating storage bin. When the crude hexane is fractionated, the liquid inlet pipe is opened to allow the crude hexane to enter the heating storage bin through the liquid inlet pipe for heating, but the heat is only heated to the boiling point of the light group, and the heated crude hexane will enter the interior of the fractionation tower through the liquid guide pipe. A fractionation part is arranged on the inner side of the bracket, and the fractionation part comprises:

[0006] A fractionation tower, the fractionation tower passes through the bracket and is fixedly connected, a first connecting pipe is fixedly connected to the top surface of the fractionation tower, a cooling bin is fixedly connected to the inner side of the bracket, a discharge pipe is fixedly connected to the top surface of the cooling bin, a reflux pipe is passed through and fixedly connected to the bottom end of the cooling bin, and an end of the reflux pipe away from the cooling bin passes through the fractionation tower and is fixedly connected;

[0007] The filter block is fixedly connected to the inner wall of the cooling bin, and a connecting bucket is passed through and fixedly connected to the bottom of the cooling bin. When the remaining liquid passes through the connecting bucket, the liquid will flow down in a vortex shape due to the bucket-shaped connecting bucket and the guide plate. A waste pipe is passed through and fixedly connected to the bottom of the connecting bucket.

[0008] Preferably, there are three groups of distillation towers, and the three groups of distillation towers are respectively fixedly connected to the inner side of the bracket, and the bottoms of every two groups of distillation towers are penetrated and fixedly connected with a second connecting pipe, and a secondary heating chamber is provided in the middle section of the second connecting pipe.

[0009] Preferably, a guide plate is fixedly connected to the inner side of the connecting bucket, and the number of the guide plates is three groups. The light group reaching the boiling point will enter the cooling bin through the first connecting pipe at the top of the rightmost distillation tower, and the light group reaching the boiling point will be discharged through the discharge pipe, and the three groups of guide plates are respectively arranged in a circular array with the center line of the connecting bucket as the axis. After cooling in the cooling bin, a part of the crude hexane and the crude hexane in the second group of distillation towers will enter the third group of distillation towers again through the second connecting pipe.

[0010] Preferably, the guide plate is fixedly connected to a fixed column at one end away from the inner side of the connecting bucket, and the remaining liquid in the last group of cooling bins will pass through the filter block and be discharged through the waste pipe. However, when the remaining liquid passes through the connecting bucket, the bucket-shaped connecting bucket and the guide plate will cause the liquid to flow down in a vortex shape. A rotating rod is penetrated and rotatably connected to the surface of the fixed column.

[0011] Preferably, a wiping ring is fixedly connected to the top end of the rotating rod, and a brush rod is fixedly connected to the inner side of the wiping ring.

[0012] Preferably, one end of the rotating rod below the fixed column passes through and is fixedly connected to a rotating block, and the surface of the rotating block is fixedly connected to a transmission plate. Due to the bucket-shaped connecting bucket and the guide plate, the liquid flows down in a vortex shape and then impacts the surface of the transmission plate. The transmission plate is impacted by the liquid and drives the rotating block to rotate, and the rotating block drives the rotating rod to rotate together.

[0013] Preferably, the number of the distillation sections is three, and only the bottom of the cooling bin in the leftmost distillation section is provided with a waste discharge pipe.

[0014] Compared with the prior art, the utility model provides a fractionation device for extracting normal hexane and isohexane from crude hexane, which has the following beneficial effects:

[0015] 1. The fractionation device for extracting normal hexane and isohexane from crude hexane heats normal hexane to boiling point and vaporizes it in a secondary heating chamber, and then discharges the normal hexane through a discharge pipe, and the remaining liquid in the last group of cooling chambers passes through a filter block and is discharged through a waste pipe. However, when the remaining liquid passes through a connecting bucket, the bucket-shaped connecting bucket and a guide plate cause the liquid to flow down in a vortex shape, and then impact the surface of a transmission plate, and the transmission plate is impacted by the liquid and drives the rotating block to rotate, and the rotating block drives the rotating rod to rotate together, causing the rotating rod to drive the wiping ring and the brush rod to rotate, thereby cleaning the filter block to prevent some impurities from remaining on the inner wall of the cooling chamber, and also ensuring the filtering effect of the filter block on the liquid.

[0016] 2. In the fractionation device for extracting normal hexane and isohexane from crude hexane, the light group reaching the boiling point will be discharged through the discharge pipe, and the crude hexane discharged from the light group will enter the interior of the second group distillation tower through the second connecting pipe and the secondary heating chamber, and the secondary heating chamber will heat the isohexane in the crude hexane to the boiling point and vaporize it, and finally discharge it through the discharge pipe in the second group to separate the isohexane. Subsequently, after cooling in the cooling chamber, a part of the crude hexane and the crude hexane in the second group distillation tower will enter the third group distillation tower through the second connecting pipe again, and the normal hexane will be heated to the boiling point and vaporized in the secondary heating chamber, and then the normal hexane will be discharged through the discharge pipe. The modular distillation tower can realize the fractionation of normal hexane and isohexane of the crude hexane at one time, which is convenient and efficient. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the front view structure of the utility model;

[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the cooling bin of the utility model;

[0019] Figure 3 This is a schematic diagram of the internal structure of the connecting bucket of the utility model;

[0020] Figure 4 It is a schematic diagram of the cross-sectional structure of the connecting bucket of the utility model.

[0021] In the figure: 1. bracket; 2. fractionation section; 21. fractionation tower; 22. first connecting pipe; 23. cooling bin; 24. discharge pipe; 25. reflux pipe; 26. second connecting pipe; 27. secondary heating bin; 28. filter block; 29. ​​connecting bucket; 210. waste pipe; 211. fixed column; 212. guide plate; 213. rotating rod; 214. wiping ring; 215. brush rod; 216. rotating block; 217. transmission plate; 3. heating storage bin; 4. liquid inlet pipe; 5. liquid guide pipe. DETAILED DESCRIPTION

[0022] like Figure 1-Figure 4As shown, the utility model provides a technical solution: a fractionation device for extracting normal hexane and isohexane from crude hexane, comprising a bracket 1, a heating storage bin 3 is fixedly connected to the inner side of the bracket 1, a liquid inlet pipe 4 is passed through and fixedly connected to the top surface of the heating storage bin 3, and a liquid guide pipe 5 is passed through and fixedly connected to the bottom of the heating storage bin 3. When the crude hexane is fractionated, the liquid inlet pipe 4 is opened to allow the crude hexane to enter the heating storage bin 3 through the liquid inlet pipe 4 for heating, but the heat is only heated to the boiling point of the light group. The heated crude hexane will enter the interior of the distillation tower 21 through the liquid guide tube 5. A distillation part 2 is set on the inner side of the bracket 1, and the distillation part 2 includes: a distillation tower 21, a first connecting pipe 22, a cooling bin 23, a discharge pipe 24, a reflux pipe 25, a second connecting pipe 26, a secondary heating bin 27, a filter block 28, a connecting bucket 29, a waste pipe 210, a fixed column 211, a guide plate 212, a rotating rod 213, a wiping ring 214, a brush rod 215, a rotating block 216, and a transmission plate 217.

[0023] The distillation tower 21 passes through the support 1 and is fixedly connected. The top surface of the distillation tower 21 is fixedly connected with a first connecting pipe 22. A cooling bin 23 is fixedly connected to the inner side of the support 1. A discharge pipe 24 is fixedly connected to the top surface of the cooling bin 23. A reflux pipe 25 passes through and is fixedly connected to the bottom end of the cooling bin 23. The end of the reflux pipe 25 away from the cooling bin 23 passes through the distillation tower 21 and is fixedly connected. The filter block 28 is fixedly connected to the inner wall of the cooling bin 23. A connecting bucket 29 is passed through and is fixedly connected to the bottom of the cooling bin 23. The n-hexane is heated to a boiling point and vaporized in the secondary heating bin 27, and then discharged through the discharge pipe 24. The remaining liquid in the last group of cooling bins 23 will pass through the filter block 28 and be discharged through the waste pipe 210. However, when the remaining liquid passes through the connecting bucket 29, the liquid will flow down in a vortex shape due to the bucket-shaped connecting bucket 29 and the guide plate 212. The bottom of the connecting bucket 29 passes through and is fixedly connected with the waste pipe 210. There are three groups of distillation towers 21 , and the three groups of distillation towers 21 are fixedly connected to the inner side of the bracket 1 , and the bottoms of every two groups of distillation towers 21 are penetrated and fixedly connected with a second connecting pipe 26 , and a secondary heating chamber 27 is provided in the middle section of the second connecting pipe 26 . A guide plate 212 is fixedly connected to the inner side of the connecting bucket 29, and the number of the guide plates 212 is three groups. The light group reaching the boiling point will enter the cooling bin 23 through the first connecting pipe 22 at the top of the rightmost distillation tower 21, and the light group reaching the boiling point will be discharged through the discharge pipe 24, and the crude hexane discharged from the light group will enter the interior of the second distillation tower 21 through the second connecting pipe 26 and the secondary heating bin 27, and the three groups of guide plates 212 are respectively arranged in a circular array with the center line of the connecting bucket 29 as the axis. The crude hexane discharged from the light group will enter the interior of the second distillation tower 21 through the second connecting pipe 26 and the secondary heating bin 27, and this time the secondary heating bin 27 will heat the isohexane in the crude hexane to the boiling point and vaporize it, and finally discharge it through the discharge pipe 24 in the second group to separate the isohexane, and then after cooling in the cooling bin 23, a part of the crude hexane and the crude hexane in the second distillation tower 21 will enter the third distillation tower 21 again through the second connecting pipe 26. The guide plate 212 is fixedly connected to a fixed column 211 at one end away from the inner side of the connecting bucket 29, and the remaining liquid in the last group of cooling bins 23 will pass through the filter block 28 and be discharged through the waste pipe 210. However, when the remaining liquid passes through the connecting bucket 29, the bucket-shaped connecting bucket 29 and the guide plate 212 will cause the liquid to flow down in a vortex shape. The surface of the fixed column 211 is penetrated and rotatably connected to a rotating rod 213. The top of the rotating rod 213 is fixedly connected to a wiping ring 214, and the inner side of the wiping ring 214 is fixedly connected to a brush rod 215.One end of the rotating rod 213 located below the fixed column 211 penetrates and is fixedly connected to a rotating block 216, and a transmission plate 217 is fixedly connected to the surface of the rotating block 216. Due to the bucket-shaped connecting bucket 29 and the guide plate 212, the liquid flows down in a vortex shape, and then impacts the surface of the transmission plate 217. The transmission plate 217 is impacted by the liquid and drives the rotating block 216 to rotate, and the rotating block 216 drives the rotating rod 213 to rotate together, causing the rotating rod 213 to drive the wiping ring 214 and the brush rod 215 to rotate, thereby cleaning the filter block 28 to prevent some impurities from remaining on the inner wall of the cooling bin 23. There are three groups of fractionation sections 2, and only the bottom of the cooling bin 23 in the leftmost fractionation section 2 is provided with a waste pipe 210.

[0024] Based on the above embodiment, when the crude hexane is fractionated, the liquid inlet pipe 4 is opened to allow the crude hexane to enter the heating storage bin 3 through the liquid inlet pipe 4 for heating, but the heat is only heated to the boiling point of the light group, and the heated crude hexane will enter the interior of the distillation tower 21 through the liquid guide pipe 5, and the light group that has reached the boiling point will enter the cooling bin 23 through the first connecting pipe 22 at the top of the rightmost distillation tower 21, and the light group that has reached the boiling point will be discharged through the discharge pipe 24, and the crude hexane discharged from the light group will enter the interior of the second group distillation tower 21 through the second connecting pipe 26 and the secondary heating bin 27, and this time the secondary heating bin 27 will heat the isohexane in the crude hexane to the boiling point and vaporize it, and finally discharge it through the discharge pipe 24 in the second group to separate the isohexane, and then after cooling in the cooling bin 23, a part of the crude hexane and the crude hexane in the second group distillation tower 21 are separated. It will enter the third group distillation tower 21 again through the second connecting pipe 26, and the n-hexane will be heated to the boiling point and vaporized in the secondary heating chamber 27, and then the n-hexane will be discharged through the discharge pipe 24, and the remaining liquid in the last group of cooling chambers 23 will pass through the filter block 28 and be discharged through the waste pipe 210. However, when the remaining liquid passes through the connecting bucket 29, the bucket-shaped connecting bucket 29 and the guide plate 212 will cause the liquid to flow down in a vortex shape, and then impact the surface of the transmission plate 217, and the transmission plate 217 will drive the rotating block 216 to rotate when impacted by the liquid, and the rotating block 216 will drive the rotating rod 213 to rotate together, causing the rotating rod 213 to drive the wiping ring 214 and the brush rod 215 to rotate, thereby cleaning the filter block 28 to prevent some impurities from remaining on the inner wall of the cooling chamber 23, and also to ensure the filtering effect of the filter block 28 on the liquid.

[0025] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A fractionation device for extracting normal hexane and isohexane from crude hexane, comprising a support (1), the inner side of the support (1) being fixedly connected to a heating storage bin (3), the top surface of the heating storage bin (3) being penetrated by and fixedly connected to a liquid inlet pipe (4), and the bottom of the heating storage bin (3) being penetrated by and fixedly connected to a liquid guide pipe (5), characterized in that: A fractionation section (2) is provided on the inner side of the support (1), and the fractionation section (2) comprises: A fractionating tower (21), the fractionating tower (21) passing through the support (1) and being fixedly connected, a first connecting pipe (22) being fixedly connected to the top surface of the fractionating tower (21), a cooling bin (23) being fixedly connected to the inner side of the support (1), a discharge pipe (24) being fixedly connected to the top surface of the cooling bin (23), a reflux pipe (25) passing through and being fixedly connected to the bottom end of the cooling bin (23), and an end of the reflux pipe (25) away from the cooling bin (23) passing through the fractionating tower (21) and being fixedly connected; A filter block (28), the filter block (28) being fixedly connected to the inner wall of the cooling bin (23), a connecting bucket (29) penetrating through and fixedly connected to the bottom of the cooling bin (23), and a waste discharge pipe (210) penetrating through and fixedly connected to the bottom of the connecting bucket (29).

2. A fractionation device for extracting normal hexane and isohexane from crude hexane according to claim 1, characterized in that: The number of the distillation towers (21) is three, and the three groups of distillation towers (21) are respectively fixedly connected to the inner side of the support (1), and the bottoms of every two groups of distillation towers (21) are penetrated and fixedly connected with a second connecting pipe (26), and a secondary heating chamber (27) is provided in the middle section of the second connecting pipe (26).

3. A fractionation device for extracting normal hexane and isohexane from crude hexane according to claim 1, characterized in that: A guide plate (212) is fixedly connected to the inner side of the connecting bucket (29), the guide plates (212) being provided in three groups, and the three groups of guide plates (212) are arranged in a circular array with the center line of the connecting bucket (29) as the axis.

4. A fractionation device for extracting normal hexane and isohexane from crude hexane according to claim 3, characterized in that: One end of the guide plate (212) away from the inner side of the connection bucket (29) is fixedly connected to a fixing column (211), and a rotating rod (213) penetrates and is rotatably connected to the surface of the fixing column (211).

5. A fractionation device for extracting normal hexane and isohexane from crude hexane according to claim 4, characterized in that: A wiping ring (214) is fixedly connected to the top end of the rotating rod (213), and a brush rod (215) is fixedly connected to the inner side of the wiping ring (214).

6. A fractionation device for extracting normal hexane and isohexane from crude hexane according to claim 4, characterized in that: One end of the rotating rod (213) located below the fixed column (211) passes through and is fixedly connected to a rotating block (216), and a transmission plate (217) is fixedly connected to the surface of the rotating block (216).

7. A fractionation device for extracting normal hexane and isohexane from crude hexane according to claim 1, characterized in that: The number of the fractionation sections (2) is three, and only the bottom of the cooling bin (23) in the leftmost fractionation section (2) is provided with a waste discharge pipe (210).

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