CN220572683U - Hexamethylenediamine refining system capable of improving operation period - Google Patents
Hexamethylenediamine refining system capable of improving operation period Download PDFInfo
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- CN220572683U CN220572683U CN202321731577.0U CN202321731577U CN220572683U CN 220572683 U CN220572683 U CN 220572683U CN 202321731577 U CN202321731577 U CN 202321731577U CN 220572683 U CN220572683 U CN 220572683U
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- sodium hydroxide
- hexamethylenediamine
- storage tank
- rectifying tower
- intermediate storage
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- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000007670 refining Methods 0.000 title claims abstract description 16
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims abstract description 150
- 238000012432 intermediate storage Methods 0.000 claims abstract description 38
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 238000000746 purification Methods 0.000 claims description 3
- 238000005406 washing Methods 0.000 abstract description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 238000000034 method Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 238000004821 distillation Methods 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000006978 adaptation Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
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- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
Abstract
The utility model provides a hexamethylenediamine refining system for improving the operation period, which comprises the following components: a first rectifying column for distilling the crude hexamethylenediamine to obtain a gas phase free of sodium hydroxide and a heavy fraction in which sodium hydroxide is present; the feed inlet of the first intermediate storage tank is connected with the heavy component phase outlet of the first rectifying tower; the feeding port of the centrifugal machine is connected with the discharging port of the first intermediate storage tank and is used for separating sodium hydroxide and hexamethylenediamine in the heavy component phase so as to obtain a heavy phase containing a large amount of sodium hydroxide and a light phase containing a small amount of sodium hydroxide; the feed inlet of the second intermediate storage tank is connected with the light phase outlet of the centrifugal machine; and the feed inlet of the second rectifying tower is connected with the discharge outlet of the second intermediate storage tank and is used for rectifying the light phase so that sodium hydroxide is remained in the second rectifying tower. The utility model can meet the buffer time required by short-time stopping and washing of the rectifying tower, and does not influence the integral operation of the rectifying system.
Description
Technical Field
The utility model relates to the technical field of hexamethylenediamine refining, in particular to a hexamethylenediamine refining system capable of improving the operation period.
Background
The crude hexamethylenediamine contains sodium hydroxide, the existence of the sodium hydroxide has great influence on the purification and separation stability of the crude hexamethylenediamine in a refining system, and when the sodium hydroxide content in the hexamethylenediamine is increased, equipment and pipelines in the subsequent working procedure are easily blocked by scaling, so that the system is unstable in operation.
In the existing hexamethylenediamine refining system, the rectifying tower is directly adopted to carry out rectifying treatment on crude hexamethylenediamine, sodium hydroxide is scaled in the rectifying tower, the rectifying tower is required to be periodically stopped and washed with water, and the integral operation period of the rectifying system is directly influenced.
Disclosure of Invention
In view of the above, the utility model provides a hexamethylenediamine refining system capable of improving the operation period, which can meet the buffer time required by short-time stopping and water washing of a rectifying tower and does not influence the integral operation of the rectifying system.
In order to achieve the above purpose, the utility model provides a hexamethylenediamine refining system for improving the operation period, which adopts the following technical scheme:
a hexamethylenediamine refining system for increasing the run length, comprising:
a first rectifying column for distilling the crude hexamethylenediamine to obtain a gas phase free of sodium hydroxide and a heavy fraction in which sodium hydroxide is present;
the feed inlet of the first intermediate storage tank is connected with the heavy component phase outlet of the first rectifying tower;
the feeding port of the centrifugal machine is connected with the discharging port of the first intermediate storage tank and is used for separating sodium hydroxide and hexamethylenediamine in the heavy component phase so as to obtain a heavy phase containing a large amount of sodium hydroxide and a light phase containing a small amount of sodium hydroxide;
the feed inlet of the second intermediate storage tank is connected with the light phase outlet of the centrifugal machine;
and the feed inlet of the second rectifying tower is connected with the discharge outlet of the second intermediate storage tank and is used for rectifying the light phase so that sodium hydroxide is remained in the second rectifying tower.
Further, the concentration of sodium hydroxide in the heavy fraction is 1.5wt% to 6wt%.
Further, the temperature at which the heavy fraction enters the centrifuge is 80 ℃ to 115 ℃ so that sodium hydroxide exists in the heavy fraction in the form of crystallites.
Further, the discharge port of the first intermediate storage tank is connected with the feed port of the centrifugal machine through a pipeline, and a first pump is arranged on the pipeline.
Further, the discharge port of the second intermediate storage tank is connected with the feed port of the second rectifying tower through a pipeline, and a second pump is arranged on the pipeline.
Further, the gas phase enters a subsequent rectification system for rectification to produce the refined hexamethylenediamine.
Further, the heavy phase is directly discharged out of the centrifuge through a heavy phase outlet on the centrifuge.
The technical scheme of the utility model at least comprises the following beneficial effects:
1. the utility model has simple structure and convenient use, the first rectifying tower, the first intermediate storage tank, the centrifugal machine, the second intermediate storage tank and the second rectifying tower are sequentially arranged, the first rectifying tower is used for gasifying part of crude hexamethylenediamine, the heavy component phase where sodium hydroxide is positioned enters the centrifugal machine for separation after passing through the first intermediate storage tank, after being separated by the centrifugal machine, the light phase containing a small amount of sodium hydroxide enters the second rectifying tower for recycling the rest hexamethylenediamine after passing through the second intermediate storage tank, the second rectifying tower is used for rectifying the light phase separated by the centrifugal machine for a long time, sodium hydroxide scaling is generated, the second rectifying tower is required to be subjected to stopping water washing at regular intervals, and as the first rectifying tower is used for carrying out distillation separation on the crude hexamethylenediamine, the first intermediate storage tank and the second intermediate storage tank can meet the buffer time required by stopping water washing of the second rectifying tower for a short time, and the whole operation of a rectifying system is not influenced by stopping water washing of the second rectifying tower for a short time;
2. the temperature of the heavy component entering a centrifugal machine is controlled to be 80-115 ℃, the concentration of sodium hydroxide is 1.5-6wt%, so that sodium hydroxide exists in a solution in a microcrystalline form, and the sodium hydroxide and hexamethylenediamine are separated by the centrifugal machine by utilizing the specific gravity difference, so that the separation effect is good;
3. the investment of the system changes the process of directly entering the second rectifying tower from the heavy component separated from the bottom of the first rectifying tower into the process of separating by a centrifuge and then sending the light phase containing less sodium hydroxide into the second rectifying tower, reduces the content of sodium hydroxide in the feed of the second rectifying tower, ensures that the whole rectifying system needs to be stopped for washing every 30-60 days (the performance of the tower is reduced due to the scaling of thick high-boiling matters mainly containing sodium hydroxide in the tower internals), and successfully prolongs the continuous operation time of the whole rectifying system by about 15-30 days after the process of entering the centrifuge is improved.
Drawings
FIG. 1 is a schematic diagram of a hexamethylenediamine refining system with improved run length according to an embodiment of the present utility model;
FIG. 2 is a schematic diagram of the flow of material in a hexamethylenediamine refining system having an improved run length according to an embodiment of the present utility model.
In the figure:
1. a first rectifying column; 2. a reboiler; 3. a first intermediate storage tank; 4. a first pump; 5. a centrifuge; 6. a second intermediate storage tank; 7. a second pump; 8. a second rectifying column; 9. and a condenser.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to fig. 1-2 of the embodiments of the present utility model. It will be apparent that the described embodiments are some, but not all, embodiments of the utility model. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the utility model, fall within the scope of protection of the utility model.
As shown in figures 1 and 2, the hexamethylenediamine refining system capable of improving the operation period comprises a first rectifying tower 1, wherein the first rectifying tower 1 is used for distilling crude hexamethylenediamine entering the first rectifying tower, the top temperature is 120-145 ℃, and the pressure is controlled at 10-25kpa absolute pressure so as to obtain a gas phase without sodium hydroxide and a heavy component phase where the sodium hydroxide is located. The gas phase enters a subsequent rectifying system to carry out rectification to produce the hexamethylene diamine. The first rectifying tower 1 is connected with a reboiler 2 and a condenser 9, which are the prior art and are not further described here.
The device also comprises a first intermediate storage tank 3, wherein the feed inlet of the first intermediate storage tank 3 is connected with the heavy component outlet of the first rectifying tower 1 through a pipeline. The heavy fraction flows from the first rectifying column 1 into the first intermediate storage tank 3 through a pipe.
The centrifugal machine is characterized by further comprising a centrifugal machine 5, wherein a feeding port of the centrifugal machine 5 is connected with a discharging port of the first intermediate storage tank 3 through a pipeline. The pipeline is provided with a first pump 4, and the first pump 4 is started, so that the heavy component in the first intermediate storage tank 3 can be pumped into the centrifugal machine 5 through the pipeline. The concentration of sodium hydroxide in the heavy component phase is 1.5-6wt%, the temperature of the heavy component phase entering the centrifuge 5 is 80-115 ℃, so that sodium hydroxide exists in the heavy component phase in a microcrystalline form, and the heavy phase containing a large amount of sodium hydroxide and the light phase containing a small amount of sodium hydroxide are obtained by separating sodium hydroxide and hexamethylenediamine by the centrifuge 5 by utilizing the specific gravity difference. The heavy phase is discharged directly from the centrifuge 5 through a heavy phase outlet on the centrifuge 5.
The centrifugal separator further comprises a second intermediate storage tank 6, and a feed inlet of the second intermediate storage tank 6 is connected with a light phase outlet of the centrifugal separator 5 through a pipeline. The light phase passes from the centrifuge 5 into a second intermediate storage tank 6.
The device further comprises a second rectifying tower 8, wherein a feed inlet of the second rectifying tower 8 is connected with a discharge outlet of the second intermediate storage tank 6 through a pipeline, a second pump 7 is arranged on the pipeline, the second pump 7 is started, and the light phase in the second intermediate storage tank 6 can be pumped into the second rectifying tower 8 through the pipeline. The second rectifying tower 8 is used for rectifying the light phase, the tower top temperature is 70-110 ℃, and the absolute pressure is 1-15kpa, so that sodium hydroxide is left in the second rectifying tower 8, and the purpose of recovering the residual hexamethylenediamine is achieved.
The second rectifying tower 8 is used for rectifying the light phase separated by the centrifugal machine 5 for a long time, then sodium hydroxide is used for scaling, and the second rectifying tower 8 is required to be stopped for washing by water at regular intervals. Because the first rectifying tower 1 carries out distillation separation on crude hexamethylenediamine, the materials required to be treated by the centrifugal machine 5 and the second rectifying tower 8 are small, the first intermediate storage tank 3 and the second intermediate storage tank 6 can meet the buffer time required by short-time stopping and water washing of the second rectifying tower 8, and the integral operation of the rectifying system is not influenced.
The working principle of the utility model is as follows:
the dehydrated crude hexamethylenediamine enters a first rectifying tower 1 for distillation. The first rectifying tower 1 is used for partially gasifying crude hexamethylenediamine, a gas phase without sodium hydroxide enters a subsequent rectifying system to carry out rectification to produce refined hexamethylenediamine, and a heavy component phase where the sodium hydroxide is located enters a centrifuge 5 to be separated after passing through the first intermediate storage tank 3. In the process, the temperature of the heavy component entering the centrifuge 5 is controlled to be 80-115 ℃, the concentration of sodium hydroxide is 1.5-6wt%, so that sodium hydroxide exists in a solution in a microcrystalline form, and the sodium hydroxide and hexamethylenediamine are separated by the centrifuge 5 by utilizing the specific gravity difference. After being separated by a centrifugal machine 5, the heavy phase containing a large amount of sodium hydroxide is directly discharged, and the light phase containing a small amount of sodium hydroxide enters a second rectifying tower 8 after passing through a second intermediate storage tank 6 to recycle the residual hexamethylenediamine. The second rectifying tower 8 has sodium hydroxide scale deposit after rectifying the light phase separated by the centrifugal machine 5 for a long time, and the second rectifying tower 8 is required to be stopped and washed periodically, because the first rectifying tower 1 distills and separates crude hexamethylenediamine, the materials required to be processed by the centrifugal machine 5 and the second rectifying tower 8 are small, the first intermediate storage tank 3 and the second intermediate storage tank 6 can meet the buffer time required by the short-time stopping and washing of the second rectifying tower 8, and the integral operation of a rectifying system cannot be influenced because the short-time stopping and washing of the second rectifying tower.
In the present utility model, unless explicitly specified and defined otherwise, for example, it may be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intermediaries, or in communication with each other or in interaction with each other, unless explicitly defined otherwise, the meaning of the terms described above in this application will be understood by those of ordinary skill in the art in view of the specific circumstances.
The foregoing is a preferred embodiment of the present utility model and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present utility model and are intended to be comprehended within the scope of the present utility model.
Claims (5)
1. A hexamethylenediamine refining system having an increased run length, comprising:
a first rectifying column (1) for distilling the crude hexamethylenediamine to obtain a gas phase free of sodium hydroxide and a heavy fraction phase in which sodium hydroxide is present;
the feed inlet of the first intermediate storage tank (3) is connected with the heavy component outlet of the first rectifying tower (1);
the feeding port of the centrifugal machine (5) is connected with the discharging port of the first intermediate storage tank (3) and is used for separating sodium hydroxide and hexamethylenediamine in the heavy component phase so as to obtain a heavy phase containing a large amount of sodium hydroxide and a light phase containing a small amount of sodium hydroxide;
the feeding port of the second intermediate storage tank (6) is connected with the light phase outlet of the centrifugal machine (5);
and the feed inlet of the second rectifying tower (8) is connected with the discharge outlet of the second intermediate storage tank (6) and is used for rectifying the light phase so that sodium hydroxide is remained in the second rectifying tower (8).
2. The hexamethylenediamine refining system with improved operation cycle according to claim 1, characterized in that the outlet of the first intermediate tank (3) is connected to the inlet of the centrifuge (5) by a pipe, on which a first pump (4) is arranged.
3. The hexamethylenediamine refining system with improved operation cycle according to claim 1, characterized in that the outlet of the second intermediate tank (6) is connected to the inlet of the second rectifying tower (8) by a pipe, on which a second pump (7) is arranged.
4. The hexamethylenediamine purification system having an improved run length according to claim 1,
and (3) enabling the gas phase to enter a subsequent rectification system for rectification to produce refined hexamethylenediamine.
5. The hexamethylenediamine purification system having an improved run length according to claim 1,
the heavy phase is directly discharged out of the centrifuge (5) through a heavy phase outlet on the centrifuge (5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321731577.0U CN220572683U (en) | 2023-07-03 | 2023-07-03 | Hexamethylenediamine refining system capable of improving operation period |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321731577.0U CN220572683U (en) | 2023-07-03 | 2023-07-03 | Hexamethylenediamine refining system capable of improving operation period |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220572683U true CN220572683U (en) | 2024-03-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321731577.0U Active CN220572683U (en) | 2023-07-03 | 2023-07-03 | Hexamethylenediamine refining system capable of improving operation period |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220572683U (en) |
-
2023
- 2023-07-03 CN CN202321731577.0U patent/CN220572683U/en active Active
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