Fractionation device for extracting n-hexane from industrial hexane
By setting up a bypass pipeline and heater in the fractionation device for extracting n-hexane from industrial hexane, the production shutdown problem in the event of a failure of the deisohexane oil tower is solved, the continuous fractionation of raw materials and the efficiency of efficiency are improved, and the production efficiency is significantly improved.
Patent Information
- Application Number
- CN202420297243.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-19
- Publication Date
- 2024-12-17
- Estimated Expiration
- 2034-02-19
AI Technical Summary
The existing fractionation device for extracting n-hexane from industrial hexanes needs to be stopped when the deisohexane oil column fails, and the fractionation operation cannot be continued, resulting in low production efficiency.
A fractionation device for extracting n-hexane from industrial hexane is designed, including a delight component column, a deisohexane oil column and a denaturated hexane oil column in series, by providing a first bypass pipeline and a second bypass pipeline, It is also equipped with a heater and cooler to realize bypass and refraction of raw materials, avoiding waiting for troubleshooting.
When the deisohexane oil column fails, fractionation can be continued through bypass pipelines and heating adjustment, which improves production efficiency and ensures fractionation efficiency through heating and insulation.
Smart Images
Figure CN222173132U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of petrochemical separation, in particular to a fractionation device for extracting normal hexane from industrial hexane, which is used for reprocessing industrial crude 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 202237321 U discloses a fractionation device for extracting normal hexane and isohexane from crude hexane, which includes a light component removal tower, a deisohexane oil tower and a deisohexane oil tower, wherein the bottom liquid outlets of the light component removal tower, the deisohexane oil tower and the deisohexane oil tower are all connected with a circulating pump through a pipeline, and the tops of the light component removal tower, the deisohexane oil tower and the deisohexane oil tower are respectively connected to a cooler and a reflux tank through a pipeline, the cooler is connected to the reflux tank through a pipeline, the reflux tank is connected to a reflux pump through a pipeline, and the reflux pump outlet is connected to two pipelines, one of which is connected to the tower top outlet, and the other is a product outlet pipe. The fractionation device is easy to operate, has low energy consumption, and has stable and reliable product quality. However, there are the following problems during use: when the deisohexane oil tower fails, it is necessary to stop production, and the raw materials that have entered the light component removal tower can no longer continue the fractionation operation, and the deisohexane oil tower needs to be maintained before it can be continued. Utility Model Content
[0004] The utility model aims to provide a fractionation device for extracting normal hexane from industrial hexane, which has a reasonable structural configuration and is safe and reliable in use, so as to solve the above-mentioned problem, avoid the raw materials that have entered the light component removal tower from being unable to continue the fractionation operation when a failure occurs in the isohexane removal tower, and improve the production efficiency.
[0005] The technical solution of the utility model is:
[0006] A fractionation device for extracting normal hexane from industrial hexane comprises a light component removal tower, a deisohexane oil tower and a deisohexane oil tower connected in series, wherein a first lifting pump, a second lifting pump and a third lifting pump are respectively arranged on the bottom discharge pipelines of the light component removal tower, the deisohexane oil tower and the deisohexane oil tower, and the tops of the light component removal tower, the deisohexane oil tower and the deisohexane oil tower are respectively connected to a first cooling reflux unit, a second cooling reflux unit and a third cooling reflux unit, and the technical key points are as follows: a first bypass pipeline is arranged between the outlet pipeline of the first lifting pump and the outlet pipeline of the second lifting pump, a first heater is arranged on the first bypass pipeline, a second bypass pipeline is arranged between the outlet pipeline of the third lifting pump and the feed pipeline of the light component removal tower, a second heater is arranged on the second bypass pipeline, a control valve is arranged at the inlet and outlet of the first bypass pipeline, a control valve is arranged at the inlet and outlet of the second bypass pipeline, a control valve is arranged at the inlet pipeline of the light component removal tower, the deisohexane oil tower and the outlet pipeline of the second lifting pump, and a control valve is arranged at the end of the outlet pipeline of the third lifting pump.
[0007] The above-mentioned distillation device for extracting normal hexane from industrial hexane, the first cooling reflux unit includes a first cooler connected to the top of the light component removal tower, and a first reflux pipeline connected to the outlet of the first cooler, the other end of the first reflux pipeline is connected to the upper part of the light component removal tower, and a light component product output branch and a first normal hexane product output branch are provided on the first reflux pipeline, and control valves are respectively provided on the light component product output branch and the first normal hexane product output branch.
[0008] The above-mentioned fractionation device for extracting normal hexane from industrial hexane, the second cooling reflux unit includes a second cooler connected to the top of the de-isohexane oil tower, a second reflux pipeline connected to the outlet of the second cooler, the other end of the second reflux pipeline is connected to the upper part of the de-isohexane oil tower, and a first isohexane product output branch is provided on the second reflux pipeline.
[0009] The above-mentioned fractionation device for extracting normal hexane from industrial hexane, the third cooling reflux unit includes a third cooler connected to the top of the normal hexane removal oil tower, and a third reflux pipeline connected to the outlet of the third cooler, the other end of the third reflux pipeline is connected to the upper part of the normal hexane removal oil tower, and the third reflux pipeline is provided with a second normal hexane product output branch and a second isohexane product output branch, and the second normal hexane product output branch and the second isohexane product output branch are respectively provided with control valves.
[0010] The beneficial effects of the utility model are:
[0011] 1. When a failure occurs in the de-isohexane oil tower, the raw materials that have entered the de-light component tower are fractionated for the first time by the first cooling reflux unit, and then enter the de-normal hexane oil tower through the first bypass pipeline. The heating temperature of the de-normal hexane oil tower is adjusted to meet the requirement of fractionating and removing the isohexane product, and then enter the de-light component tower through the second bypass pipeline. The heating temperature of the de-light component tower is adjusted to meet the requirement of fractionating and removing the normal hexane product, so that the raw materials that have entered the de-light component tower do not need to wait for the failure of the de-isohexane oil tower to be eliminated, thereby significantly improving the production efficiency.
[0012] 2. Since the distance between the light component removal tower and the normal-hexane oil removal tower is relatively far, and the span of the first bypass pipeline is relatively large, a first heater is provided to heat and keep the material in the first bypass pipeline to ensure the distillation demand and the distillation efficiency. Similarly, a second heater is provided to heat and keep the material in the second bypass pipeline to ensure the distillation demand and the distillation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 It is a structural schematic diagram of the utility model.
[0014] In the figure: 1. inlet pipeline, 2. light component removal tower, 3. first cooler, 4. isohexane removal tower, 5. second cooler, 6. normal hexane removal tower, 7. third cooler, 8. third reflux pipeline, 9. second normal hexane product output branch, 10. second isohexane product output branch, 11. third booster pump, 12. second bypass pipeline, 13. second reflux pipeline, 14. first isohexane product output branch, 15. second booster pump, 16. first bypass pipeline, 17. first heater, 18. first reflux pipeline, 19. light component product output branch, 20. first normal hexane product output branch, 21. first booster pump, 22. second heater. DETAILED DESCRIPTION
[0015] The utility model is described in detail according to the accompanying drawings of the specification.
[0016] like Figure 1 As shown, the fractionation device for extracting normal hexane from industrial hexane comprises a light component removal tower 2, a deisohexane oil tower 4 and a deisohexane oil tower 6 connected in series. A first lift pump 21, a second lift pump 15 and a third lift pump 11 are respectively provided on the bottom discharge pipelines of the light component removal tower 2, the deisohexane oil tower 4 and the deisohexane oil tower 6. The tops of the light component removal tower 2, the deisohexane oil tower 4 and the deisohexane oil tower 6 are respectively connected to a first cooling reflux unit, a second cooling reflux unit and a third cooling reflux unit.
[0017] Among them, a first bypass pipe 16 is provided between the outlet pipe of the first lift pump 21 and the outlet pipe of the second lift pump 15, and a first heater 17 is provided on the first bypass pipe 16. A second bypass pipe 12 is provided between the outlet pipe of the third lift pump 11 and the feed pipe of the light component removal tower 2, and a second heater 22 is provided on the second bypass pipe 12. The inlet and outlet of the first bypass pipe 16 are both provided with control valves, and the inlet and outlet of the second bypass pipe 12 are both provided with control valves. The inlet pipes of the light component removal tower 2 and the deisohexane oil tower 4 and the outlet pipe of the second lift pump 15 are both provided with control valves, and a control valve is provided at the end of the outlet pipe of the third lift pump 11.
[0018] In this embodiment, the first cooling reflux unit includes a first cooler 3 connected to the top of the light component removal tower 2, a first reflux pipeline 18 connected to the outlet of the first cooler 3, the other end of the first reflux pipeline 18 is connected to the upper part of the light component removal tower 2, a light component product output branch 19 and a first normal hexane product output branch 20 are provided on the first reflux pipeline 18, and control valves are provided on the light component product output branch 19 and the first normal hexane product output branch 20. The second cooling reflux unit includes a second cooler 5 connected to the top of the deisohexane oil tower 4, a second reflux pipeline 13 connected to the outlet of the second cooler 5, the other end of the second reflux pipeline 13 is connected to the upper part of the deisohexane oil tower 4, and a first isohexane product output branch 14 is provided on the second reflux pipeline 13. The third cooling reflux unit comprises a third cooler 7 connected to the top of the de-n-hexane oil tower 6, and a third reflux pipeline 8 connected to the outlet of the third cooler 7. The other end of the third reflux pipeline 8 is connected to the upper part of the de-n-hexane oil tower 6. The third reflux pipeline 8 is provided with a second n-hexane product output branch 9 and a second isohexane product output branch 10. The second n-hexane product output branch 9 and the second isohexane product output branch 10 are respectively provided with control valves.
[0019] Working principle:
[0020] The industrial crude hexane pretreated by the hydrodearomatization reaction enters the light component removal tower 2 through the inlet pipe 1 and is heated and fractionated. The light components of the fraction are removed from the top of the tower. According to the reflux ratio, a part of the light components are condensed and stored in the first cooler 3 and then refluxed into the light component removal tower 2, and the other part of the light components are discharged through the light component product output branch 19; the remaining fraction discharged from the bottom discharge port of the light component removal tower 2 is sent to the deisohexane oil tower 4 through the first lift pump 21, and the isohexane is condensed and stored in the second cooler 5 at the top of the tower. , part of the isohexane refluxes into the de-isohexane oil tower 4, and the other part of the isohexane is discharged through the first isohexane product output branch 14; the fraction discharged from the bottom discharge port of the de-isohexane oil tower 4 is sent to the de-normal hexane oil tower 6 through the second lift pump 15, and the top of the tower is condensed and stored with normal hexane through the third cooler 7, part of the normal hexane refluxes into the de-normal hexane oil tower 6, and the other part is discharged through the second normal hexane product output branch 9; the bottom discharge of the de-normal hexane oil tower 6 is discharged through the outlet pipe of the third lift pump 11.
[0021] When the isohexane removal tower 4 fails, the raw materials that have entered the light component removal tower 2 are fractionated for the first time through the first cooling reflux unit to remove the light components, and all the raw materials are sent to the first bypass pipeline 16 through the first lift pump 21, and then sent to the normal-hexane removal tower 6 through the first bypass pipeline 16. The demand for fractionating and removing the isohexane product is achieved by adjusting the heating temperature, and the isohexane product is exported through the second isohexane product output branch 10; the material discharged from the bottom of the normal-hexane removal tower 6 enters the light component removal tower 2 through the second bypass pipeline 12, and the demand for fractionating and removing the normal-hexane product is achieved by adjusting the heating temperature, and the normal-hexane product is exported through the first normal-hexane product output branch 20, and the heavy components are directly discharged through the bottom discharge of the light component removal tower 2.
[0022] 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 extracting normal hexane from industrial hexane, comprising a light component removal tower, a deisohexane oil tower and a deisohexane oil tower connected in series, wherein the bottom discharge pipelines of the light component removal tower, the deisohexane oil tower and the deisohexane oil tower are respectively provided with a first lifting pump, a second lifting pump and a third lifting pump, and the tops of the light component removal tower, the deisohexane oil tower and the deisohexane oil tower are respectively connected to a first cooling reflux unit, a second cooling reflux unit and a third cooling reflux unit, Features: A first bypass pipe is provided between the outlet pipe of the first lift pump and the outlet pipe of the second lift pump, a first heater is provided on the first bypass pipe, a second bypass pipe is provided between the outlet pipe of the third lift pump and the feed pipe of the light component removal tower, a second heater is provided on the second bypass pipe, control valves are provided at the inlet and outlet of the first bypass pipe, control valves are provided at the inlet and outlet of the second bypass pipe, control valves are provided on the inlet pipes of the light component removal tower and the de-isohexane oil tower and the outlet pipe of the second lift pump, and a control valve is provided at the end of the outlet pipe of the third lift pump.
2. The fractionation device for extracting normal hexane from industrial hexane according to claim 1, Features: The first cooling reflux unit includes a first cooler connected to the top of the light component removal tower, and a first reflux pipeline connected to the outlet of the first cooler. The other end of the first reflux pipeline is connected to the upper part of the light component removal tower. A light component product output branch and a first n-hexane product output branch are provided on the first reflux pipeline. Control valves are respectively provided on the light component product output branch and the first n-hexane product output branch.
3. The fractionation device for extracting normal hexane from industrial hexane according to claim 1, Features: The second cooling reflux unit includes a second cooler connected to the top of the de-isohexane oil tower, a second reflux pipeline connected to the outlet of the second cooler, the other end of the second reflux pipeline is connected to the upper part of the de-isohexane oil tower, and a first isohexane product output branch is provided on the second reflux pipeline.
4. The fractionation device for extracting normal hexane from industrial hexane according to claim 1, Features: The third cooling reflux unit includes a third cooler connected to the top of the de-n-hexane oil tower, and a third reflux pipeline connected to the outlet of the third cooler. The other end of the third reflux pipeline is connected to the upper part of the de-n-hexane oil tower. A second n-hexane product output branch and a second isohexane product output branch are provided on the third reflux pipeline. Control valves are respectively provided on the second n-hexane product output branch and the second isohexane product output branch.