CN212680560U - Noncondensable gas solvent absorption washing device of maleic anhydride device refining system - Google Patents
Noncondensable gas solvent absorption washing device of maleic anhydride device refining system Download PDFInfo
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- CN212680560U CN212680560U CN202021465021.8U CN202021465021U CN212680560U CN 212680560 U CN212680560 U CN 212680560U CN 202021465021 U CN202021465021 U CN 202021465021U CN 212680560 U CN212680560 U CN 212680560U
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Abstract
The utility model belongs to the technical field of maleic anhydride is retrieved, concretely relates to maleic anhydride device refining system noncondensable gas solvent absorbs washing device, including light component tower and finished product tower, light component tower bottom be connected with finished product tower middle part feed inlet, finished product tower top is connected with the product condenser, the product condenser bottom is connected with the product return tank, product return tank top and absorption washing device sub-unit connection, absorption washing device upper portion and dry solvent pipe connection, absorption washing device top and evacuation headtotail, absorption washing device bottom and analytic headtotail. The utility model discloses can make noncondensable gas advance evacuation system's pipeline no longer block up, prevent effectively that the finished product tower vacuum is undulant, be favorable to finished product tower steady operation, product quality has had the assurance, can effectively retrieve the maleic anhydride that noncondensable gas carried, prevents to cause the product loss, and sewage pH, COD that evacuation system produced no longer exceed standard, follow-up sewage treatment plant running cost reduces.
Description
Technical Field
The utility model belongs to the technical field of the maleic anhydride is retrieved, concretely relates to maleic anhydride device refining system noncondensable gas solvent absorbs washing unit.
Background
In order to meet the increasing market demand of maleic anhydride as a basic organic raw material and the processing and production thereof, the production capacity of the maleic anhydride in the world is rapidly increased, and the apparent consumption of the maleic anhydride in China is continuously increased according to domestic market analysis. In recent years, the worldwide maleic anhydride industry is shifting from benzene to n-butane synthesis.
At present, the production capacity of the n-butane method accounts for 80 percent of the total production capacity of the maleic anhydride. A maleic anhydride refining system in a maleic anhydride device by a normal butane method removes impurities in crude anhydride to obtain refined anhydride with higher purity, adopts the principle of reduced pressure distillation, utilizes the difference of boiling points (volatility) of light components, maleic anhydride, heavy components and other components in a crude anhydride mixture, heats a liquid mixture, vaporizes the light components, guides the vaporized light components out for condensation, and separates the light components from the heavy components. Since the boiling point of each fraction in the mixture is lowered by lowering the pressure, the higher boiling fraction is vaporized at a lower temperature, lowering the operating temperature of the distillation column. Therefore, a vacuum pumping system is arranged to continuously pump out the non-condensable gas and light components in the tower, thereby forming vacuum in the tower and enabling the refining of the crude anhydride to be operated under reduced pressure.
Although the crude maleic anhydride from the bottom of the light component tower is subjected to primary separation of light components, maleic anhydride and heavy components through the light component tower, the crude maleic anhydride entering the finished product tower needs further rectification separation to obtain high-quality maleic anhydride. Because the noncondensable gas at the top of the finished product tower still carries a small amount of maleic anhydride, the maleic anhydride is inevitably brought into a vacuumizing device and an auxiliary pipeline along with the operation of the device, and the part of the maleic anhydride is continuously condensed and deposited into the pipeline to block the pipeline to influence the vacuumizing effect, so that the vacuum degree fluctuation of the finished product tower is caused, and the product quality is unqualified; maleic anhydride brought to the vacuum-pumping system can be dissolved in sewage of the vacuum-pumping system to cause that the pH and COD of the sewage of the device exceed the standards, thereby bringing difficulty to subsequent sewage treatment and increasing the sewage treatment cost; meanwhile, the part of maleic anhydride enters a vacuum-pumping system to be dissolved and carried into sewage, which is also a product loss.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model is: the defects of the prior art are overcome, the noncondensable gas solvent absorption washing device of the maleic anhydride device refining system is provided, and the problem that a small amount of maleic anhydride is carried in noncondensable gas at the top of a finished product tower of the maleic anhydride device refining system is solved.
The utility model discloses an adopt following technical scheme to realize:
the noncondensable gas solvent absorption washing device of the maleic anhydride device refining system comprises a light component tower and a finished product tower, wherein the bottom of the light component tower is connected with a feed inlet in the middle of the finished product tower, the top of the finished product tower is connected with a product condenser, the bottom of the product condenser is connected with a product reflux tank, the top of the product reflux tank is connected with the lower part of the absorption washing device, the upper part of the absorption washing device is connected with a dry solvent pipeline, the top of the absorption washing device is connected with a vacuumizing system, and the bottom of the absorption washing device is connected with an analyzing system.
Preferably, the absorption washing device is a corrugated packed tower.
Preferably, the finished product tower is connected with a maleic anhydride intermediate tank through a maleic anhydride cooler.
Preferably, the bottom of the finished product tower is connected with the resolution tower, the bottom of the finished product tower is also connected with a reboiler, and an outlet of the reboiler is connected with the finished product tower.
Preferably, the bottom of the product reflux tank is connected with a finished product tower.
The working principle and the process are as follows:
crude maleic anhydride from the bottom of a light component tower of a refining system is conveyed to a finished product tower through a finished product tower feeding pump, enters the finished product tower from the middle filler section of the finished product tower, gas at the top of the finished product tower is condensed and cooled to 60 ℃ in a product condenser and then automatically flows to a product reflux tank, gas from the product reflux tank enters the lower part of an absorption washing device from the top of the tank under the action of vacuum, fully contacts with a dry solvent from a dry solvent pipeline through a corrugated filler, is fully absorbed by the dry solvent, recovers the maleic anhydride therein, a rich solvent absorbing the maleic anhydride is conveyed to an analytic system through a centrifugal pump for recycling, and noncondensable gas is discharged from the top of the absorption washing device and conveyed to a vacuum pumping system through a pipeline. And heating a part of heavy components containing maleic anhydride at the bottom of the finished product tower by a reboiler, returning the heated part to the bottom of the finished product tower, and conveying the part to the desorption tower by a finished product tower kettle liquid pump. High-quality maleic anhydride product is taken out from the side line below the top filling section in the finished product tower, and is cooled to 60 ℃ from 130 ℃ in a maleic anhydride cooler and then is pumped to a maleic anhydride intermediate tank for temporary storage.
Compared with the prior art, the beneficial effects of the utility model are as follows:
1. the utility model discloses can make noncondensable gas advance evacuation system's pipeline no longer block up, prevent effectively that the finished product tower vacuum is undulant, be favorable to the steady operation of finished product tower, product quality has had the assurance.
2. The utility model discloses can effectively retrieve the maleic anhydride that noncondensable gas carried, prevent to cause the product loss.
3. The utility model discloses sewage pH, COD that vacuum pumping system produced no longer exceed standard, and follow-up sewage treatment plant running cost reduces.
Drawings
Fig. 1 is a schematic structural view of the present invention;
in the figure: 1. a light component column; 2. a finished product tower; 3. a product condenser; 4. a product reflux tank; 5. a dry solvent line; 6. an absorption washing device; 7. a vacuum pumping system; 8. an analytic system; 9. a resolution tower; 10. a reboiler; 11. a maleic anhydride intermediate tank; 12. a maleic anhydride cooler.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
As shown in fig. 1, the noncondensable gas solvent absorption washing device of the maleic anhydride device refining system comprises a light component tower 1 and a finished product tower 2, wherein the bottom of the light component tower 1 is connected with a feed inlet in the middle of the finished product tower 2, the top of the finished product tower 2 is connected with a product condenser 3, the bottom of the product condenser 3 is connected with a product reflux tank 4, the top of the product reflux tank 4 is connected with the lower part of an absorption washing device 6, the upper part of the absorption washing device 6 is connected with a dry solvent pipeline 5, the top of the absorption washing device 6 is connected with a vacuum pumping system 7, and the bottom of the absorption washing device 6 is connected with an analysis system 8.
The absorption washing device 6 is a corrugated packing tower.
The finished product tower 2 is connected with a maleic anhydride intermediate tank 11 through a maleic anhydride cooler 12.
The bottom of the finished product tower 2 is connected with a desorption tower 9, the bottom of the finished product tower 2 is also connected with a reboiler 10, and the outlet of the reboiler 10 is connected with the finished product tower 2.
The bottom of the product reflux tank 4 is connected with the finished product tower 2.
When the device works, crude maleic anhydride from the bottom of a light component tower 1 of a refining system is conveyed to a finished product tower 2 through a feed pump, enters the finished product tower 2 from a position between filling sections in the middle of the finished product tower 2, gas at the top of the finished product tower 2 is condensed and cooled to 60 ℃ in a product condenser 3, then automatically flows to a product reflux tank 4, gas discharged from the product reflux tank 4 enters the lower part of an absorption washing device 6 from the top of the tank under the action of vacuum, is fully contacted with a dry solvent from a dry solvent pipeline 5 through a corrugated filler, is fully absorbed by the dry solvent, and recovers maleic anhydride therein, a rich solvent after absorbing the maleic anhydride is conveyed to an analysis system 8 through a centrifugal pump for recycling, and non-condensable gas is discharged from the top of the absorption washing device 6 and conveyed to a vacuum pumping system 7 through a pipeline. And a part of heavy components containing maleic anhydride at the bottom of the finished product tower 2 is heated by a reboiler 10 and then returns to the bottom of the finished product tower 2, and a part of heavy components is conveyed to an analytical tower 9 through a kettle liquid pump of the finished product tower 2. High quality maleic anhydride product is withdrawn from the bottom side of the top packing section in the finishing column 2 and cooled from 130 deg.c to 60 deg.c in a maleic anhydride cooler 12 and pumped to a maleic anhydride intermediate tank 11 for temporary storage.
Of course, the above description is only a preferred embodiment of the present invention, and should not be taken as limiting the scope of the embodiments of the present invention. The present invention is not limited to the above examples, and the technical field of the present invention is equivalent to the changes and improvements made in the actual range of the present invention, which should be attributed to the patent coverage of the present invention.
Claims (5)
1. The utility model provides a maleic anhydride device refining system noncondensable gas solvent absorbs washing unit, includes light component tower (1) and finished product tower (2), its characterized in that: the tower bottom of light component tower (1) be connected with finished product tower (2) middle part feed inlet, finished product tower (2) top is connected with product condenser (3), product condenser (3) bottom is connected with product backward flow jar (4), product backward flow jar (4) top and absorption washing device (6) sub-unit connection, absorption washing device (6) upper portion is connected with dry solvent pipeline (5), absorption washing device (6) top is connected with evacuation system (7), absorption washing device (6) bottom is connected with analytic system (8).
2. The non-condensable gas solvent absorption washing device of the maleic anhydride unit refining system according to claim 1, wherein: the absorption washing device (6) is a corrugated packing tower.
3. The non-condensable gas solvent absorption washing device of the maleic anhydride unit refining system according to claim 1, wherein: the finished product tower (2) is connected with a maleic anhydride intermediate tank (11) through a maleic anhydride cooler (12).
4. The non-condensable gas solvent absorption washing device of the maleic anhydride unit refining system according to claim 1, wherein: the bottom of the finished product tower (2) is connected with the desorption tower (9), the bottom of the finished product tower (2) is also connected with a reboiler (10), and the outlet of the reboiler (10) is connected with the finished product tower (2).
5. The non-condensable gas solvent absorption washing device of the maleic anhydride unit refining system according to claim 1, wherein: the bottom of the product reflux tank (4) is connected with the finished product tower (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021465021.8U CN212680560U (en) | 2020-07-22 | 2020-07-22 | Noncondensable gas solvent absorption washing device of maleic anhydride device refining system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021465021.8U CN212680560U (en) | 2020-07-22 | 2020-07-22 | Noncondensable gas solvent absorption washing device of maleic anhydride device refining system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212680560U true CN212680560U (en) | 2021-03-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021465021.8U Active CN212680560U (en) | 2020-07-22 | 2020-07-22 | Noncondensable gas solvent absorption washing device of maleic anhydride device refining system |
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| Country | Link |
|---|---|
| CN (1) | CN212680560U (en) |
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2020
- 2020-07-22 CN CN202021465021.8U patent/CN212680560U/en active Active
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