CN114653087A - Partition wall tower - Google Patents
Partition wall tower Download PDFInfo
- Publication number
- CN114653087A CN114653087A CN202210290662.1A CN202210290662A CN114653087A CN 114653087 A CN114653087 A CN 114653087A CN 202210290662 A CN202210290662 A CN 202210290662A CN 114653087 A CN114653087 A CN 114653087A
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- column
- dividing wall
- line
- wall column
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/141—Fractional distillation or use of a fractionation or rectification column where at least one distillation column contains at least one dividing wall
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/14—Fractional distillation or use of a fractionation or rectification column
- B01D3/32—Other features of fractionating columns ; Constructional details of fractionating columns not provided for in groups B01D3/16 - B01D3/30
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D3/00—Distillation or related exchange processes in which liquids are contacted with gaseous media, e.g. stripping
- B01D3/42—Regulation; Control
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treatment Of Liquids With Adsorbents In General (AREA)
Abstract
The invention relates to a dividing wall column (100) having a vertical partition arranged therein, which forms a prefractionation section (1) and a main column section (3) on both sides, wherein the dividing wall column (100) has a first feed line (S1) connected to the prefractionation section (1) and a first side extraction line (S3) connected to the main column section (3), characterized in that the dividing wall column (100) has a first switching device (V3) which can switch the first side extraction line (S3) on or off.
Description
Technical Field
The present invention relates to a dividing wall tower.
Background
The Dividing Wall Column (DWC) rectification technology is characterized in that a vertical partition plate is arranged in a common rectification Column, and the partition plate is arranged, so that the function of two columns can be realized by a single Column, the back mixing of intermediate components in the flow of the two columns is avoided, the mixing effect near a feeding section is reduced, the thermodynamic efficiency is improved, and the energy consumption can be greatly reduced. Meanwhile, a rectifying tower and accessory equipment including a condenser, a reboiler, a reflux tank, a reflux pump and the like can be saved by adopting a dividing wall tower technology, so that the equipment investment and the occupied area are reduced. Therefore, the dividing wall tower is a process strengthening technology which can simultaneously realize double saving of energy saving, consumption reduction and equipment investment reduction.
Chinese utility model patent CN207047164U discloses a following light component piece-rate system of reformate C5, wherein shows typical next door tower structure, vertical division board that sets up in the next door tower divides into four regions with next door tower inside, one side region that the division board is located next door tower material entry is the main tower section for prefractionation section, one side region that the division board is located next door tower lateral wall discharge gate, division board top region is top of the tower rectification section, division board bottom region is bottom of the tower stripping section.
The Chinese patent application CN111686469A discloses a middle steam compression two-section dividing tower, wherein the dividing tower comprises a pre-separation section, a side line extraction section and a public stripping section, the top of a partition plate of the dividing tower is sealed, the steam of the pre-separation section and the steam of the side line extraction section flow out and are converged together to enter a compressor, and the steam is pressurized and heated by the compressor to be used as a heat source of a tower kettle of the dividing tower and then enters the public rectifying section dividing tower.
The Chinese invention patent CN 106699566B discloses a method for co-producing ethyl acetate and n-butyl acetate by a reactive distillation bulkhead tower, wherein the method adopts the reactive distillation bulkhead tower, raw material ethanol is fed from the bottom of a reaction section, raw material n-butyl alcohol and acetic acid are fed from the middle of the reaction section, and binary azeotrope of n-butyl acetate and water is taken out as a side product.
The dividing wall tower has high design requirements, the design is not appropriate or the feeding composition changes are deviated from the design basis too much, the actual operation effect index is possibly poor, and the energy consumption is greatly increased. When the product slate needs to be adjusted, for example, in the case of no side draw, the operation of the dividing wall column is not as simple as the operation of a conventional rectification column, or even may not be as energy-efficient as a conventional rectification column.
Disclosure of Invention
In view of the above technical problems, an object of the present invention is to provide a dividing wall column having a vertical partition disposed therein, a pre-fractionation section and a main column section being formed at both sides of the vertical partition, the dividing wall column having a first feed line connected to the pre-fractionation section and a first side extraction line connected to the main column section, the dividing wall column having a first switching device capable of switching on or off the first side extraction line.
According to the dividing wall tower, the corresponding side production pipeline can be switched on or off through the switch device according to the process requirements, so that the dividing wall tower can select a proper state combination from a plurality of state combinations to flexibly adapt to the switching requirements among different processes. For example, when the first switching device is turned on, the dividing wall tower of the present invention has the first supply line and the first side extraction line, and becomes a typical dividing wall tower. When the first switching device is opened, the dividing wall column of the invention becomes a conventional rectification column with a first feed line and stripping and/or rectification lines. This avoids the repeated construction and can be flexibly switched according to the seasons, the supply and demand relations, etc.
According to a preferred embodiment of the dividing wall column provided by the invention, the dividing wall column further has a second feed line connected to the main column section and a second switching device capable of switching the second feed line on or off. The switching on and off of the second switching device and the first switching device can be selected in combination, thereby providing more flexibility to the dividing wall tower of the present invention. When the first switch device and the second switch device are both switched on, the dividing wall tower becomes a common rectifying tower which respectively supplies materials from the pre-fractionating section and the main tower section through the first feeding pipeline and the second feeding pipeline and carries out side-mining from the first side-mining pipeline. When the first switching device is turned off and the second switching device is turned on, the dividing wall column of the present invention becomes a general rectifying column which supplies the materials from the pre-fractionation section and the main column section through the first supply line and the second supply line. When the first switching device is on and the second switching device is off, the divided wall column of the present invention becomes a typical divided wall column having the first feed line of the prefractionation section and the first side take line of the main column section. When the first switch device and the second switch device are both switched off, the partition wall tower becomes a common rectifying tower.
Alternatively, according to a preferred embodiment of the divided wall column provided by the present invention, the divided wall column further has a second side production line connected to the pre-fractionation section and a third switching device capable of switching on or off the second side production line.
Alternatively, the divided wall column may have both a second feed line connected to the main column section and a second switching device capable of switching the second feed line on or off, and a second side take line connected to the prefractionating section and a third switching device capable of switching the second side take line on or off.
Obviously, as described above, further combinations of the next-wall tower states can be achieved by switching the first switching device, the second switching device and, if necessary, the third switching device on and off.
The entry points of the first feed line and the second feed line into the dividing wall column may be of the same height or of different heights. The second feed line can optionally receive material in parallel with the first feed line upstream of the line of the second switching device, in particular if the first feed line and the second feed line have the same height in the inlet position into the dividing wall column.
The outlet positions of the first side production pipeline and the second side production pipeline which are connected into the bulkhead tower can have the same height or different heights. The second side production line can optionally be tapped off in parallel with the first feed line downstream of the line common to the first and third switching devices, in particular if the first and second side production lines have the same height at the outlet points into the dividing wall column.
Preferably, the first, second and third switching devices may be valves, switches or blind plates capable of switching between on and off states.
In the divided wall column, in addition to the prefractionation section and the main column section formed on both sides of the vertical partition, a rectification section having a rectification line for drawing out a rectification component is preferably formed above the region of the vertical partition, and a stripping section having a stripping line for drawing out a stripping component is preferably formed below the region of the vertical partition. The rectifying section and stripping section are not required in each divided wall column, although it should be ensured that at least one of the rectifying section and stripping section should be present in each divided wall column to achieve withdrawal of material without side cut, but only with feed.
The partition wall tower according to the invention can be a packed tower, or a plate tower, or a composite tower consisting of the packed tower and the plate tower.
Drawings
FIGS. 1A and 2A schematically illustrate an embodiment of a dividing wall column according to the present invention when a first switching device switches a first sidedraw line on or off, respectively;
FIGS. 1B and 2B schematically show a dividing wall column of the present invention when the first side draw line is switched on or off, respectively, equivalent to a dividing wall column or a rectification column of the prior art;
FIGS. 3A, 4A and 5A schematically illustrate another embodiment of a dividing wall column according to the present invention when the first and second switching devices are selectively turned on or off;
FIGS. 3B, 3C, 4B and 5B schematically show a dividing wall column of the present invention, respectively, equivalent to a dividing wall column or a rectifying column of the prior art when the first feed line and the first side extraction line are each switched on or off, wherein FIG. 3C shows the case where the same material is supplied in parallel to the pre-fractionation section and the main column section through two feed lines;
FIGS. 6A, 7A and 8A schematically illustrate yet another embodiment of a dividing wall column according to the invention when the first, second and third switching devices are selectively switched on or off;
fig. 6B, 6C, 7B and 8B schematically show the dividing wall column of the present invention equivalent to a dividing wall column or a rectifying column of the prior art when the first feed line, the first side production line and the second side production line are respectively connected or disconnected, wherein fig. 6C simultaneously shows the case where the same material is supplied in parallel to the pre-fractionation section and the main column section through the two feed lines and the case where the same material is collected in parallel from the pre-fractionation section and the main column section through the two side production lines.
Detailed Description
The invention is described in detail below with reference to the attached drawing figures, which are only for explaining the invention and are not to be construed as limiting the invention.
FIG. 1A schematically shows a first embodiment of a divided wall column according to the invention, in which, as shown in FIG. 1A, a vertical partition is arranged inside a divided wall column 100 of the invention, which vertical partition forms, on both sides, a pre-fractionation section 1 and a main column section 3, respectively, the divided wall column 100 having a first feed line S1 communicating with the pre-fractionation section 1 and a first side production line S3 communicating with the main column section 3, the divided wall column 100 having a first switching device V3 capable of switching on and off the first side production line S3. Fig. 2A schematically shows the state of the first embodiment of the dividing wall tower according to the invention when the first switching device V3 is open.
When the first switchgear V3 is switched on, as shown in fig. 1A, the first embodiment of the dividing wall column 100 according to the invention is equivalent to a dividing wall column of the prior art, as shown in fig. 1B, which in addition to the top and bottom offtakes also takes from the side offtake. When no side draw is required, the first switchgear V3 is disconnected, as shown in fig. 2A, and the first embodiment of the dividing wall column 100 according to the invention is equivalent to a conventional rectification column of the prior art, as shown in fig. 2B, in which the mode of operation is simpler than for a dividing wall column. Therefore, the dividing wall column of the present invention can be flexibly switched between the two functional states of the dividing wall column and the ordinary rectification column by turning on and off the first switching device V3.
Fig. 3A, 4A and 5A each schematically show a second embodiment of a dividing wall column according to the invention, in which a second feed line S5 connected to the main column section 3 and a second switching device V5 capable of switching the second feed line S5 on and off are added in comparison to the first embodiment of the dividing wall column 100 according to the invention.
When both the first and second switching devices are on, as shown in fig. 3A, the second embodiment of the dividing wall column 100 according to the present invention is equivalent to a conventional rectification column having two feed lines and one side take line, as shown in fig. 3B.
Fig. 3C further illustrates the case where two feed lines are connected in parallel, which is equivalent to a conventional rectification column having one feed line and one side take line. The second feed line S5 and the first feed line S1 may have the same height.
When the first switching device V3 is off and the second switching device V5 is on, as shown in fig. 4A, the second embodiment of the dividing wall column 100 according to the present invention is equivalent to a conventional rectification column with two feed lines, without side cut, as shown in fig. 4B.
If the second feed line S5 and the first feed line S1 are connected in parallel (not shown), this is equivalent to a conventional rectification column with one feed line, without side cut, as shown in fig. 2B.
When the first switching device V3 is on and the second switching device V5 is off, as shown in fig. 5A, the second embodiment of the dividing wall column 100 according to the present invention is equivalent to a dividing wall column having one feed line and one side production line, as shown in fig. 5B.
Fig. 6A, 7A and 8A each schematically show a third embodiment of a dividing wall column according to the invention, in which a second side product line S6, which is connected to the prefractionation section 1, and a third switching device V6, which can switch on or off the second side product line S6, are added in comparison to the second embodiment of the dividing wall column 100 according to the invention.
When the first, second, and third switching devices are all turned on, as shown in fig. 6A, the third embodiment of the dividing wall column 100 according to the present invention is equivalent to a general rectifying column having two feed lines and two side take lines, as shown in fig. 6B.
Fig. 6C further illustrates the case where both feed lines and side pick lines are connected in parallel. Equivalent to a conventional rectification column with one feed line and one side draw line as shown in fig. 5B. The second feed line S5 and the first feed line S1 may have the same height, and the second sidedraw line S6 and the first sidedraw line S3 may have the same height.
When the first switching device V3 is turned on, the second switching device V5 is turned off, and the third switching device V6 is turned on, as shown in fig. 7A, the third embodiment of the dividing wall column 100 according to the present invention is equivalent to a general rectifying column having one feed line and two side take lines, as shown in fig. 7B. When the first switching device V3 is on, the second switching device V5 is off and the third switching device V6 is off, as shown in fig. 8A, the third embodiment of the dividing wall column 100 according to the invention is equivalent to a dividing wall column with one feed line and one side take line, as shown in fig. 8B.
In the drawings corresponding to the above embodiments, the rectifying section 2 and the stripping section 4 are drawn, the rectifying section 2 has a rectifying line S2 for leading out a rectifying component above the region of the vertical partition, and the stripping section 4 has a stripping line S4 for leading out a stripping component below the region of the vertical partition. However, it is clearly understood that the simultaneous presence of the rectifying section and the stripping section in these embodiments is not always necessary. The invention is directed to a flexible connection of the supply line or the side draw line by switching on or off the switching device, which can be adapted in a modified manner to any embodiment with or without a rectification section or stripping section.
The foregoing describes preferred embodiments of the present invention, but the spirit and scope of the present invention is not limited to the specific disclosure herein. Those skilled in the art can freely combine and expand the above-described embodiments in accordance with the teachings of the present invention to make further embodiments and applications within the spirit and scope of the present invention. The spirit and scope of the present invention are not to be limited by the specific embodiments but by the appended claims.
List of reference numerals
100 dividing wall tower
1 prefractionation section
2 rectifying section
3 main tower section
4 stripping section
S1 first supply line
S2 rectification line
S3 first side production line
S4 stripping line
S5 second supply line
S6 second side production line
V3 first switch device
V5 second switch device
V6 third switching device
Claims (11)
1. A divided wall column (100) having a vertical partition arranged inside it, which forms on both sides a pre-fractionation section (1) and a main column section (3), respectively, the divided wall column (100) having a first feed line (S1) connected to the pre-fractionation section (1) and a first side sampling line (S3) connected to the main column section (3), characterized in that the divided wall column (100) has a first switching device (V3) which can switch the first side sampling line (S3) on or off.
2. The dividing wall column (100) according to claim 1, wherein the dividing wall column (100) further has a second feed line (S5) connected to the main column section (3) and a second switching device (V5) capable of switching the second feed line (S5) on or off.
3. The dividing wall column (100) according to claim 2, wherein the dividing wall column (100) further has a second side production line (S6) connected to the pre-fractionation section (1) and a third switching device (V6) capable of switching the second side production line (S6) on or off.
4. The dividing wall column (100) of claim 2, wherein the second feed line (S5) receives material in parallel with the first feed line (S1) upstream of the line of the second switchgear (V5).
5. The dividing wall column (100) of claim 2, wherein the first feed line (S1) and the second feed line (S5) have the same height at the entry location into the dividing wall column (100).
6. The dividing wall column (100) according to claim 3, wherein the second sidedraw line (S6) joins material in parallel with the first feed line (S1) downstream of the line common to the first switching device (V3) and the third switching device (V6).
7. The dividing wall tower (100) of claim 3, wherein the first sidedraw line (S3) and the second sidedraw line (S6) have the same height at the exit location into the dividing wall tower (100).
8. The dividing wall column (100) of any of claims 1 to 7, wherein the switching device is a valve, a switch or a blind plate that can be switched between on and off states.
9. The divided wall column (100) according to any of claims 1 to 7, wherein a stripping section (4) having a stripping line (S4) for withdrawing stripped components is formed within the divided wall column (100) below the region of the vertical partition.
10. The dividing wall column (100) according to any of claims 1 to 7, wherein a rectification section (2) is formed within the dividing wall column above the region of the vertical partition, the rectification section having a rectification line (S2) for leading out a rectification component.
11. The dividing wall column (100) according to any of claims 1 to 7, wherein the dividing wall column is a packed column, a tray column or a composite column of a packed column and a tray column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210290662.1A CN114653087A (en) | 2022-03-23 | 2022-03-23 | Partition wall tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210290662.1A CN114653087A (en) | 2022-03-23 | 2022-03-23 | Partition wall tower |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114653087A true CN114653087A (en) | 2022-06-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210290662.1A Pending CN114653087A (en) | 2022-03-23 | 2022-03-23 | Partition wall tower |
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| Country | Link |
|---|---|
| CN (1) | CN114653087A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070083065A1 (en) * | 2004-01-08 | 2007-04-12 | Basf Aktiengesellschaft | Method for the distillative recovery of toluylenediamine |
| CN205796590U (en) * | 2016-03-17 | 2016-12-14 | 南京科技职业学院 | A kind of lateral line discharging extracting rectifying and solvent recovery unit |
| CN110960881A (en) * | 2018-09-28 | 2020-04-07 | 中国石油化工股份有限公司 | Control structure and control method of Kaibel bulkhead rectifying tower |
| CN214436602U (en) * | 2020-12-26 | 2021-10-22 | 河南金丹乳酸科技股份有限公司 | Novel rectifying tower is used in lactate preparation |
-
2022
- 2022-03-23 CN CN202210290662.1A patent/CN114653087A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070083065A1 (en) * | 2004-01-08 | 2007-04-12 | Basf Aktiengesellschaft | Method for the distillative recovery of toluylenediamine |
| CN205796590U (en) * | 2016-03-17 | 2016-12-14 | 南京科技职业学院 | A kind of lateral line discharging extracting rectifying and solvent recovery unit |
| CN110960881A (en) * | 2018-09-28 | 2020-04-07 | 中国石油化工股份有限公司 | Control structure and control method of Kaibel bulkhead rectifying tower |
| CN214436602U (en) * | 2020-12-26 | 2021-10-22 | 河南金丹乳酸科技股份有限公司 | Novel rectifying tower is used in lactate preparation |
Non-Patent Citations (1)
| Title |
|---|
| 梁红梅等: "房屋建筑安装工程常用图例符号速查速用手册", 华中科技大学出版社, pages: 25 - 27 * |
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