CN220860691U - Negative pressure rectification processing system - Google Patents
Negative pressure rectification processing system Download PDFInfo
- Publication number
- CN220860691U CN220860691U CN202322570358.5U CN202322570358U CN220860691U CN 220860691 U CN220860691 U CN 220860691U CN 202322570358 U CN202322570358 U CN 202322570358U CN 220860691 U CN220860691 U CN 220860691U
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- Prior art keywords
- cooler
- vacuum pump
- reflux tank
- balance pipe
- rectification
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- 238000010992 reflux Methods 0.000 claims abstract description 44
- 239000007788 liquid Substances 0.000 claims abstract description 24
- 238000000926 separation method Methods 0.000 claims description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 3
- 239000010959 steel Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 14
- 238000000034 method Methods 0.000 abstract description 6
- VVQNEPGJFQJSBK-UHFFFAOYSA-N Methyl methacrylate Chemical compound COC(=O)C(C)=C VVQNEPGJFQJSBK-UHFFFAOYSA-N 0.000 description 7
- 238000009835 boiling Methods 0.000 description 5
- 238000005260 corrosion Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000007792 addition Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 125000002843 carboxylic acid group Chemical group 0.000 description 1
- 238000006555 catalytic reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000026030 halogenation Effects 0.000 description 1
- 238000005658 halogenation reaction Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 238000010534 nucleophilic substitution reaction Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 238000005809 transesterification reaction Methods 0.000 description 1
Landscapes
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The utility model provides a negative pressure rectifying treatment system, wherein a rectifying tower is connected with a front cooler, the front cooler is connected with a cooler, the cooler is connected with a rear cooler, and a gas outlet on a lower seal head of the rear cooler is connected with a vacuum pump; the liquid outlet of the front cooler lower end socket, the liquid outlet of the cooler lower end socket and the liquid outlet of the rear cooler lower end socket are all connected with a reflux tank; and a balance pipe is arranged on the reflux tank, one end of the balance pipe is connected with the reflux tank, and the other end of the balance pipe is connected with a connecting pipeline between the aftercooler and the vacuum pump. The setting has solved the unstable problem of rectifying column vacuum that vacuum pump material caused, has also avoided the frequent start of vacuum pump to stop simultaneously. The rectification treatment system has the advantages of reasonable design, strong practicability and low cost; by using the rectification treatment system, the pressure in the rectification tower can be more stable, and the smooth proceeding of the rectification process is facilitated.
Description
Technical Field
The utility model relates to the technical field of negative pressure towers of refinement industry, in particular to a negative pressure rectification treatment system.
Background
Methyl Methacrylate (MMA) has a boiling point of 100.6 ℃ at normal temperature and pressure, is easy to polymerize under the actions of light, heat and catalysis, can be copolymerized with other monomers, and is easy to carry out addition, halogenation and nucleophilic substitution nuclear transesterification due to double bonds and carboxylic acid groups.
Because the methyl methacrylate has relatively active chemical properties and is easy to polymerize when the temperature is high, the methyl methacrylate with higher purity is obtained in the rectification section, and the crude methyl methacrylate is heated to raise the temperature, so that high-low boiling substances in the crude methyl methacrylate can be separated, and the methyl methacrylate with higher purity is obtained; in order to reduce the influence of temperature on the polymerization condition of methyl methacrylate, a rectifying tower is adopted for negative pressure operation, and the boiling point of each component is reduced under the negative pressure condition, so that the temperature required for purification is reduced.
The rectifying tower comprises a tower body, a reboiler, a front cooler, a rear cooler, a reflux tank and the like, and the vacuum of the rectifying tower is maintained by a vacuum pump; the material is cooled by the tower top through the front cooler, the cooler and the rear cooler after being heated, the condensate returns to the reflux tank, and the non-condensable gas is connected to a pipeline of the vacuum pump through a lower end socket of the rear cooler and then enters the vacuum pump to be discharged and emptied.
Because the reflux tank is a sealed tank, the pressure in the cooler is smaller than the pressure in the reflux tank along with the increase of materials, so that the materials are accumulated at the lower end socket of the cooler, and after a certain amount of materials are reached, condensate liquid can be sucked into the vacuum pump, thereby leading to unstable vacuum of the rectifying tower or leading to failure and shutdown of the vacuum pump. In order to solve the problem, a mode of controlling the on-off of the vacuum pump is generally adopted to raise the pressure in the cooler, however, the mode causes frequent on-off of the vacuum pump, which is unfavorable for the stable pressure in the rectifying tower, and thus, is unfavorable for the smooth proceeding of the rectifying process.
Disclosure of Invention
In view of the above, the utility model provides a negative pressure rectification treatment system, in particular to a negative pressure rectification treatment system which is provided with a balance pipe to ensure that the pressure of a reflux tank is smaller than the pressure of a front cooler lower end socket, a cooler lower end socket and a rear cooler lower end socket, so that materials can flow into the reflux tank in time. By using the rectification treatment system, the pressure in the rectification tower can be more stable, and the smooth proceeding of the rectification process is facilitated.
On the basis of the prior art, the utility model provides a negative pressure rectification treatment system which comprises a rectification tower, a front cooler, a rear cooler and a reflux tank;
The top of the rectifying tower is connected with an inlet of a front cooler, a gas outlet on a lower end enclosure of the front cooler is connected with an inlet of a cooler, a gas outlet on a lower end enclosure of the cooler is connected with an inlet of a rear cooler, and a gas outlet on a lower end enclosure of the rear cooler is connected with a vacuum pump;
The liquid outlet of the front cooler lower end socket, the liquid outlet of the cooler lower end socket and the liquid outlet of the rear cooler lower end socket are all connected with a reflux tank;
A balance pipe is arranged on the reflux tank, one end of the balance pipe is connected with the reflux tank, and the other end of the balance pipe is connected with a connecting pipeline between the aftercooler and the vacuum pump;
this setting makes the vacuum pump can be to the pressure control in the reflux drum, makes the pressure in the reflux drum be less than the pressure of preceding cooler low head, cooler low head and aftercooler low head to can make the condensate get into in the reflux drum smoothly, and then maintain rectifying column internal pressure stable, guarantee that the rectification process goes on smoothly.
Materials in the reflux tank are heated by a reboiler, materials with low boiling point are condensed by a front cooler, a cooler and a rear cooler through the tower top after heat exchange of a rectifying tower, condensate flows back into the reflux tank, and non-condensable gas is discharged to an emptying system along with a vacuum pump for treatment; the arrangement of the balance pipe ensures that the pressure in the reflux tank is equivalent to the inlet pressure of the vacuum pump, namely, the pressure in the reflux tank is ensured to be smaller than the pressure of the top cooler, so that materials can flow back in time without gathering at the lower end socket of the cooler, and the stability of the vacuum degree is ensured.
Preferably, the bottom of the reflux tank is connected with a reboiler, the outlet of the reboiler is divided into two paths, and one path is connected with the middle upper part of the rectifying tower and used for rectifying the condensate in the recovery tank again; one path is connected with a reflux tank.
Preferably, a gas-liquid separation tank is arranged on a connecting pipeline between the aftercooler and the vacuum pump, and the gas-liquid separation tank is positioned between the balance pipe and the vacuum pump; the gas-liquid separation tank separates the gas and liquid discharged from the aftercooler, and reduces the moisture in the discharged gas.
Preferably, the balance pipe is DN25 white steel pipe, and has the advantages of corrosion resistance and pressure resistance.
Compared with the prior art, the utility model has the beneficial effects that the pressure of the reflux tank is smaller than the pressure of the lower end socket of the front cooler, the lower end socket of the cooler and the lower end socket of the rear cooler by arranging the balance pipe, so that materials can flow into the reflux pipe in time; the setting has solved the unstable problem of rectifying column vacuum that vacuum pump material caused, has also avoided the frequent start of vacuum pump to stop simultaneously. The rectification treatment system has the advantages of reasonable design, strong practicability and low cost; by using the rectification treatment system, the pressure in the rectification tower can be more stable, and the smooth proceeding of the rectification process is facilitated.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are required to be used in the description of the embodiments or the prior art will be briefly described below, and it will be obvious to those skilled in the art that other drawings can be obtained from these drawings without inventive effort.
FIG. 1 is a schematic diagram of the structure of the present utility model.
In the figure, a 1-rectifying tower, a 2-pre-cooler, a 3-cooler, a 4-post-cooler, a 5-reflux tank, a 6-vacuum pump, a 7-reboiler, an 8-balance pipe and a 9-gas-liquid separation tank.
Detailed Description
In order to make the technical solution of the present utility model better understood by those skilled in the art, the technical solution of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, shall fall within the scope of the present utility model.
As shown in fig. 1, a negative pressure rectification treatment system comprises a rectification tower, a front cooler, a rear cooler and a reflux tank;
The top of the rectifying tower is connected with an inlet of a front cooler, a gas outlet on a lower end enclosure of the front cooler is connected with an inlet of a cooler, a gas outlet on a lower end enclosure of the cooler is connected with an inlet of a rear cooler, and a gas outlet on a lower end enclosure of the rear cooler is connected with a vacuum pump;
The liquid outlet of the front cooler lower end socket, the liquid outlet of the cooler lower end socket and the liquid outlet of the rear cooler lower end socket are all connected with a reflux tank;
The bottom of the reflux tank is connected with a reboiler, the outlet of the reboiler is divided into two paths, and one path is connected with the middle upper part of the rectifying tower and used for rectifying the condensate in the recovery tank again; one path is connected with a reflux tank;
A balance pipe is arranged on the reflux tank, one end of the balance pipe is connected with the reflux tank, and the other end of the balance pipe is connected with a connecting pipeline between the aftercooler and the vacuum pump;
the balance pipe is DN25 white steel pipe, which has the advantages of corrosion resistance and pressure resistance;
A gas-liquid separation tank is arranged on a connecting pipeline between the aftercooler and the vacuum pump, and the gas-liquid separation tank is positioned between the balance pipe and the vacuum pump; the gas-liquid separation tank separates the gas and liquid discharged from the aftercooler, so as to reduce the moisture in the discharged gas;
this setting makes the vacuum pump can be to the pressure control in the reflux drum, makes the pressure in the reflux drum be less than the pressure of preceding cooler low head, cooler low head and aftercooler low head to can make the condensate get into in the reflux drum smoothly, and then maintain rectifying column internal pressure stable, guarantee that the rectification process goes on smoothly.
Materials in the reflux tank are heated by a reboiler, materials with low boiling point are condensed by a front cooler, a cooler and a rear cooler through the tower top after heat exchange of a rectifying tower, condensate flows back into the reflux tank, and non-condensable gas is discharged to an emptying system along with a vacuum pump for treatment; the arrangement of the balance pipe ensures that the pressure in the reflux tank is equivalent to the inlet pressure of the vacuum pump, namely, the pressure in the reflux tank is ensured to be smaller than the pressure of the top cooler, so that materials can flow back in time without gathering at the lower end socket of the cooler, and the stability of the vacuum degree is ensured.
The present utility model has been described in detail above. The "upper", "lower", "left" and "right" in this embodiment are described with respect to the positions in the drawings of the specification. Although the present utility model has been described in detail by way of preferred embodiments with reference to the accompanying drawings, the present utility model is not limited thereto. Various equivalent modifications and substitutions may be made in the embodiments of the present utility model by those skilled in the art without departing from the spirit and scope of the present utility model, and it is intended that all such modifications and substitutions be within the scope of the present utility model/be within the scope of the present utility model as defined by the appended claims. Therefore, the protection scope of the present utility model shall be subject to the protection scope of the claims.
Claims (4)
1. The negative pressure rectification treatment system is characterized by comprising a rectification tower, a front cooler, a rear cooler and a reflux tank;
The top of the rectifying tower is connected with an inlet of a front cooler, a gas outlet on a lower end enclosure of the front cooler is connected with an inlet of a cooler, a gas outlet on a lower end enclosure of the cooler is connected with an inlet of a rear cooler, and a gas outlet on a lower end enclosure of the rear cooler is connected with a vacuum pump;
The liquid outlet of the front cooler lower end socket, the liquid outlet of the cooler lower end socket and the liquid outlet of the rear cooler lower end socket are all connected with a reflux tank;
And a balance pipe is arranged on the reflux tank, one end of the balance pipe is connected with the reflux tank, and the other end of the balance pipe is connected with a connecting pipeline between the aftercooler and the vacuum pump.
2. The negative pressure rectification processing system as claimed in claim 1, wherein a reboiler is connected to the bottom of the reflux tank, and the outlet of the reboiler is divided into two paths, one path being connected to the middle upper part of the rectification column; one path is connected with a reflux tank.
3. The negative pressure rectification processing system of claim 1, wherein a gas-liquid separation tank is installed on a connection line between the aftercooler and the vacuum pump, the gas-liquid separation tank being located between the balance pipe and the vacuum pump.
4. The negative pressure rectification processing system of claim 1, wherein said balance tube is a DN25 white steel tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322570358.5U CN220860691U (en) | 2023-09-21 | 2023-09-21 | Negative pressure rectification processing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322570358.5U CN220860691U (en) | 2023-09-21 | 2023-09-21 | Negative pressure rectification processing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220860691U true CN220860691U (en) | 2024-04-30 |
Family
ID=90816775
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322570358.5U Active CN220860691U (en) | 2023-09-21 | 2023-09-21 | Negative pressure rectification processing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220860691U (en) |
-
2023
- 2023-09-21 CN CN202322570358.5U patent/CN220860691U/en active Active
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