Fractionation device for producing n-hexane

Abstract

The utility model relates to a fractionating device for producing n-hexane, which comprises an n-hexane removal tower, a reflux unit, a feeding pipeline and an n-hexane discharge pipeline, a plurality of tower plates are arranged in the n-hexane removal tower, and the technical key points are that: overflow plates are arranged above one side of each tower plate, the overflow plates of two vertically adjacent tower plates are oppositely arranged in the n-hexane removal tower, and the reflux unit is arranged on the reflux unit; the tower plate is provided with a baffle plate below the same side of the overflow plate, a vertical blanking channel is formed below a space surrounded by the overflow plate and the inner wall of the normal hexane removal tower, a horizontal material passing channel is formed between the lower end of the baffle plate and the upper surface of the tower plate below the baffle plate, a plurality of vent holes are formed in the middle of the tower plate, and a turntable covering the vent holes is arranged above the tower plate; a driving motor is fixed at the center of the top of the normal hexane removal tower, the output end of the driving motor is connected with a vertical shaft, and the vertical shaft is fixedly connected with the center of each turntable. The device can adjust the ventilation flow according to production requirements, and is flexible to use and high in applicability.

Description

Technical Field

[0001] The utility model relates to normal hexane production equipment, in particular to a fractionation device for producing normal hexane. Background Art

[0002] N-hexane is mainly used as a solvent for the polymerization of olefins such as propylene, an extractant for edible vegetable oils, a solvent for rubber and coatings, and a diluent for pigments. In general, industrial grade n-hexane products with a purity of 60%-80% (wt) are obtained by distillation and separation from platinum reforming raffinate oil.

[0003] CN 214105866 U discloses a fractionation device for producing normal hexane and isohexane, which comprises a light component removal tower and a normal hexane removal tower. The feed port of the light component removal tower is connected to the oil outlet of the oil outlet pipeline, the top of the light component removal tower is connected to the petroleum ether I outlet pipeline, the side line extraction outlet of the light component removal tower is connected to the feed port of the normal hexane removal tower, and the bottom oil outlet of the light component removal tower is connected to the petroleum ether III outlet pipeline; the top of the normal hexane removal tower is connected to the isohexane outlet pipeline, and the bottom of the normal hexane removal tower is connected to the normal hexane outlet pipeline; the light component removal tower is a baffle tower, and the normal hexane removal tower is a plate tower. The fractionation device introduces a baffle tower, which can integrate the internal energy of a multi-tower system, and a single tower realizes the functions of two towers, thereby improving thermodynamic efficiency, saving a distillation tower and ancillary equipment, and reducing equipment investment and floor space. However, there are the following problems during use: the ventilation apertures of each plate in the plate tower are generally fixed, and the ventilation flow rate cannot be adjusted. Utility Model Content

[0004] The utility model aims to provide a fractionation device for producing normal hexane with reasonable structure and reliable use to solve the above problems, which can adjust the ventilation flow rate according to production needs, is flexible to use and has strong applicability.

[0005] The technical solution of the utility model is:

[0006] A fractionation device for producing normal hexane comprises a normal hexane removal tower, a reflux unit connected to the top of the normal hexane removal tower, a feed pipeline connected to the middle of the normal hexane removal tower, and a normal hexane discharge pipeline connected to the bottom of the normal hexane removal tower, wherein a plurality of tower plates are arranged from top to bottom at intervals in the normal hexane removal tower, and the technical key points are as follows: an overflow plate is arranged above one side of the tower plate, the overflow plates of two vertically adjacent tower plates are arranged oppositely in the normal hexane removal tower, a baffle plate is arranged below the same side of the tower plate on the overflow plate, and the overflow plate is connected to the normal hexane removal tower. A vertical material discharge channel is formed below the space surrounded by the inner wall of the de-n-hexane tower, a horizontal material transfer channel is formed between the lower end of the baffle plate and the upper surface of the tower plate below it, a plurality of air holes are provided in the middle of the tower plate, and a turntable covering the air holes is provided above the tower plate, the turntable is provided with through holes corresponding to the air holes one by one, a driving motor is fixed at the center of the top of the de-n-hexane tower, the output end of the driving motor is connected to a vertical shaft, the vertical shaft is connected and fixed to the center of each turntable, and avoidance holes corresponding to the vertical shafts are provided on the tower plate.

[0007] The above-mentioned fractionation device for producing normal hexane, the reflux unit includes a cooler connected to the top of the normal hexane removal tower, a reflux tank connected to the outlet of the cooler, and a reflux pump connected to the outlet of the reflux tank, the end of the outlet pipeline of the reflux pump is connected to the reflux port of the normal hexane removal tower, and the outlet pipeline is provided with an isohexane removal branch.

[0008] In the above-mentioned fractionation device for producing normal hexane, the normal hexane removal tower is provided with a reflux liquid separator connected to the reflux port at a position above the uppermost tower plate, and the reflux liquid separator is a semicircular cavity with diversion holes evenly arranged on the lower surface.

[0009] In the above-mentioned distillation device for producing normal hexane, an upper baffle and a lower baffle are provided on the inner side of the top of the de-normal hexane tower, and the upper baffle and the lower baffle form an S-shaped gas channel in the top of the tower. The lower surfaces of the upper baffle and the lower baffle are provided with a plurality of vertical baffles that are conducive to gas condensation.

[0010] The beneficial effects of the utility model are:

[0011] 1. Since there are several ventilation holes in the middle of the tower plate, and a turntable covering the ventilation holes is provided above the turntable, and through holes corresponding to the ventilation holes are provided on the turntable, when the ventilation flow needs to be adjusted, the driving motor is used to drive the turntable to rotate the set angle so that the through holes and the ventilation holes completely overlap or the turntable surface covers part of the ventilation holes, so as to achieve the purpose of adjusting the ventilation flow according to production needs. It is flexible to use and has strong applicability.

[0012] 2. The setting of upper and lower baffles and vertical baffles is beneficial to improving the distillation of n-hexane and improving the distillation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1It is a structural schematic diagram of the utility model;

[0014] Figure 2 yes Figure 1 Enlarged view of part A in the middle.

[0015] In the figure: 1. drive motor, 2. upper baffle, 3. lower baffle, 4. cooler, 5. reflux tank, 6. reflux pump, 7. isohexane removal branch, 8. n-hexane removal tower, 9. overflow plate, 10. baffle plate, 11. vertical downward material channel, 12. vertical shaft, 13. n-hexane discharge pipeline, 14. horizontal material channel, 15. feed pipeline, 16. tower plate, 17. vertical baffle, 18. reflux liquid distributor, 19. diversion hole, 20. reflux port, 21. turntable, 22. vent. DETAILED DESCRIPTION

[0016] The utility model is described in detail according to the accompanying drawings of the specification.

[0017] like Figure 1 , Figure 2 As shown, the fractionation device for producing normal hexane comprises a normal hexane removal tower 8, a reflux unit connected to the top of the normal hexane removal tower 8, a feed pipeline 15 connected to the middle of the normal hexane removal tower 8, and a normal hexane discharge pipeline 13 connected to the bottom of the normal hexane removal tower 8. The normal hexane removal tower 8 is provided with a plurality of trays 16 spaced from top to bottom to form a serpentine liquid channel in the tower.

[0018] Wherein: an overflow plate 9 is arranged above one side of the tower plate 16, and the overflow plates 9 of two vertically adjacent tower plates 16 are arranged relatively in the de-hexane tower 8, and a baffle plate 10 is arranged below the same side of the tower plate 16, and a vertical feeding channel 11 is formed below the space surrounded by the overflow plate 9 and the inner wall of the de-hexane tower 8, and a horizontal feeding channel 14 is formed between the lower end of the baffle plate 10 and the upper surface of the tower plate 16 below it. A plurality of vents 22 are arranged in the middle of the tower plate 16, and a turntable 21 covering the vents 22 is arranged above it, and the turntable 21 is provided with through holes corresponding to the vents 22 one by one. A driving motor 1 is fixed at the center of the top of the de-hexane tower 8, and a vertical shaft 12 is connected to the output end of the driving motor 1, and the vertical shaft 12 is connected and fixed to the center of each turntable 21, and a avoidance hole corresponding to the vertical shaft 12 is arranged on the tower plate 16.

[0019] In this embodiment, the reflux unit includes a cooler 4 connected to the top of the de-n-hexane tower 8, a reflux tank 5 connected to the outlet of the cooler 4, and a reflux pump 6 connected to the outlet of the reflux tank 5. The end of the outlet pipeline of the reflux pump 6 is connected to the reflux port 20 of the de-n-hexane tower 8, and an isohexane removal branch 7 is provided on the outlet pipeline.

[0020] The de-n-hexane tower 8 is provided with a reflux liquid separator 18 connected to the reflux port 20 at a position above the uppermost tower plate 16. The reflux liquid separator 18 is a semicircular cavity with diversion holes 19 evenly arranged on the lower surface. An upper baffle plate 2 and a lower baffle plate 3 are arranged on the inner side of the tower top of the de-n-hexane tower 8. The upper baffle plate 2 and the lower baffle plate 3 form an S-shaped gas channel in the tower top. The lower surfaces of the upper baffle plate 2 and the lower baffle plate 3 are provided with a plurality of vertical baffle plates 17 that are conducive to gas condensation.

[0021] Working principle:

[0022] The de-n-hexane tower 8 is preheated to a set temperature, and the raw material enters the de-n-hexane tower 8 through the feed pipeline 15, falls to the bottom of the tower through the serpentine liquid channel formed in the tower, and the de-n-hexane gas rises through the vent holes 22 on the tower plate 16, and then enters the reflux unit through the upper and lower baffles, and finally the isohexane component is removed through the isohexane removal branch 7, and the n-hexane product is discharged from the n-hexane discharge pipeline 13.

[0023] The above is a detailed description of the embodiments of the utility model, but the above contents are only preferred embodiments of the utility model and cannot be considered to limit the scope of implementation of the utility model. All equivalent changes and improvements made within the scope of the invention of the utility model should still fall within the scope of this patent.

Claims

1. A fractionation device for producing normal hexane, comprising a normal hexane removal tower, a reflux unit connected to the top of the normal hexane removal tower, a feed pipeline connected to the middle of the normal hexane removal tower, and a normal hexane discharge pipeline connected to the bottom of the normal hexane removal tower, wherein a plurality of trays are arranged in the normal hexane removal tower from top to bottom. Features: An overflow plate is provided above one side of the tower plate, and the overflow plates of two vertically adjacent tower plates are arranged relatively to each other in the de-n-hexane tower. A material baffle plate is provided below the tower plate on the same side of the overflow plate, and a vertical material discharge channel is formed below the space surrounded by the overflow plate and the inner wall of the de-n-hexane tower, and a horizontal material transfer channel is formed between the lower end of the material baffle plate and the upper surface of the tower plate below it. A plurality of air holes are provided in the middle of the tower plate, and a turntable covering the air holes is provided above the tower plate, and through holes corresponding to the air holes are provided on the turntable. A driving motor is fixed at the center of the top of the de-n-hexane tower, and a vertical shaft is connected to the output end of the driving motor. The vertical shaft is connected and fixed to the center of each turntable, and avoidance holes corresponding to the vertical shaft are provided on the tower plate.

2. The fractionation device for producing normal hexane according to claim 1, Features: The reflux unit comprises a cooler connected to the top of the normal-hexane removal tower, a reflux tank connected to the outlet of the cooler, and a reflux pump connected to the outlet of the reflux tank. The end of the outlet pipeline of the reflux pump is connected to the reflux port of the normal-hexane removal tower, and an isohexane removal branch is arranged on the outlet pipeline.

3. The fractionation device for producing normal hexane according to claim 1, Features: The de-n-hexane tower is provided with a reflux liquid separator communicated with the reflux port at a position above the uppermost tower plate. The reflux liquid separator is a semicircular cavity with diversion holes evenly arranged on the lower surface.

4. The fractionation device for producing normal hexane according to claim 1, Features: An upper baffle and a lower baffle are provided on the inner side of the tower top of the de-n-hexane tower, and the upper baffle and the lower baffle form an S-shaped gas channel in the tower top. The lower surfaces of the upper baffle and the lower baffle are provided with a plurality of vertical baffles that are conducive to gas condensation.

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