CN219376107U - Rectification system for preparing durene from carbon dioxide - Google Patents
Rectification system for preparing durene from carbon dioxide Download PDFInfo
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- CN219376107U CN219376107U CN202320240849.0U CN202320240849U CN219376107U CN 219376107 U CN219376107 U CN 219376107U CN 202320240849 U CN202320240849 U CN 202320240849U CN 219376107 U CN219376107 U CN 219376107U
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Abstract
The utility model particularly discloses a rectification system for preparing durene from carbon dioxide, which comprises a rectification tower, a primary cooler, a secondary cooler, a reflux tank, a primary sampler, a primary moisture meter, a secondary sampler, a secondary moisture meter, a tertiary sampler and a tertiary moisture meter. The advantages are that: according to the utility model, the three-level sampler and the three-level moisture meter are communicated with the top extraction pipe of the rectifying tower, so that the real-time monitoring of the moisture content of the product produced from the top of the tower is realized; meanwhile, when the detection result of the three-level moisture meter is abnormal, the leakage position can be judged and determined by checking the first-level moisture meter and the second-level moisture meter, then the leakage position can be found and processed in time when the leakage amount is small, the reduction of mass product quality is reduced, the stability of production operation is improved, the monitoring of the product quality of the rectifying tower is realized, and the investment is reduced.
Description
Technical Field
The utility model relates to the technical field of chemical leak detection, in particular to a rectification system for preparing durene from carbon dioxide.
Background
The new material production technology for preparing durene from carbon dioxide is that waste gas carbon dioxide and synthetic gas in methanol synthesis production are used as raw materials, and mixed aromatic hydrocarbon is produced through a synthesis reaction. In the mixed aromatic hydrocarbon component, various aromatic hydrocarbon substances such as toluene, tetramethylbenzene and hexamethylbenzene are produced with the increase of carbon atoms. Therefore, in the production of durene by carbon dioxide, a rectifying tower is selected to separate mixed aromatic hydrocarbon at corresponding temperature according to different volatilities of all components so as to obtain the required durene and other components.
In order to separate mixed aromatic hydrocarbon conveniently, the operation of the rectification tower for preparing durene from carbon dioxide adopts negative pressure rectification, and the pressure in the rectification tower is far lower than the pressure of cooling water medium in each cooler at the top of the tower. When the cooler at the top of the rectifying tower leaks inwards, cooling water with higher pressure leaks to one side of aromatic hydrocarbon and then enters the reflux tank, so that the water content in the product is increased, and the product quality is affected. For the rectifying tower with more than one cooler at the top of the tower, after the water content in the reflux tank is increased, the situation that the water is leaked in the cooler cannot be judged, so that difficulty is brought to leakage detection and leakage blocking.
Disclosure of Invention
The utility model aims to provide a rectification system for preparing durene from carbon dioxide, which can judge and process accurately in time so as to ensure the quality of products.
The utility model discloses a rectification system for preparing durene by carbon dioxide, which comprises a rectification tower, a primary cooler, a secondary cooler, a reflux tank, a primary sampler, a primary moisture meter, a secondary sampler, a secondary moisture meter, a tertiary sampler and a tertiary moisture meter; the side wall of the rectifying tower is communicated with a feeding pipe, a top gas outlet of the rectifying tower is communicated with a gas inlet of the primary cooler through a pipeline, a gas outlet of the primary cooler is communicated with a gas inlet of the secondary cooler through a pipeline, and a gas outlet of the secondary cooler is communicated with a gas inlet of the vacuum ejector; the liquid outlet of the primary cooler and the liquid outlet of the secondary cooler are communicated with the liquid inlet of the reflux tank through pipelines, the liquid outlet of the reflux tank is communicated with the liquid inlet of the rectifying tower through a liquid return pipeline, a reflux pump is arranged on the liquid return pipeline, and a tower top extraction pipe is communicated with the liquid return pipeline at the outlet of the reflux pump; the primary sampler is communicated with a pipeline which is communicated with the primary cooler and the reflux tank, and the primary moisture meter is communicated with the primary sampler; the pipeline which is communicated with the secondary cooler and the reflux tank is communicated with the secondary sampler, and the secondary water meter is communicated with the secondary sampler; the tower top extraction pipeline is communicated with the three-stage sampler, and the three-stage sampler is communicated with the three-stage moisture meter.
Further, the device also comprises a reboiler, wherein a liquid inlet and a liquid outlet of the reboiler are communicated with the bottom of the rectifying tower through pipelines.
Further, a bottom extraction pipe is communicated with the bottom of the rectifying tower.
The utility model has the advantages that:
according to the utility model, the three-level sampler and the three-level moisture meter are communicated with the top extraction pipe of the rectifying tower, so that the real-time monitoring of the moisture content of the product produced from the top of the tower is realized; when the result detected by the three-level moisture meter is abnormal, the leakage position can be judged and determined by checking the first-level moisture meter and the second-level moisture meter, and then the leakage position can be found and processed in time when the leakage amount is smaller, so that the reduction of mass product quality is reduced, the stability of production operation is improved, the monitoring of the product quality of the rectifying tower is realized, and the investment is reduced.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow diagram of the system of the present utility model.
Rectifying column 1, primary cooler 2, primary sampler 201, primary moisture meter 202, secondary cooler 3, secondary sampler 301, secondary moisture meter 302, vacuum ejector 4, reboiler 5, reflux tank 6, reflux pump 7, overhead extraction pipe 8, tertiary sampler 801, tertiary moisture meter 802, bottom extraction pipe 9, feed pipe 10, cooling water feed pipe 11, cooling water return pipe 12, and return liquid pipe 13.
Detailed Description
As shown in fig. 1, a rectification system for producing durene from carbon dioxide comprises a rectification tower 1, a primary cooler 2, a secondary cooler 3, a reflux tank 6, a primary sampler 201, a primary moisture meter 202, a secondary sampler 301, a secondary moisture meter 302, a tertiary sampler 801 and a tertiary moisture meter 802; the first-stage sampler 201, the second-stage sampler 301 and the third-stage sampler 801 in this embodiment are all on-line samplers of the model BQML-B1 manufactured by the Boritt technology Co., ltd. The first-stage moisture meter 202, the second-stage moisture meter 302 and the third-stage moisture meter 802 in this embodiment are all on-line microwave moisture meters manufactured by the Morse technology Co., ltd. Germany. The side wall of the rectifying tower 1 is communicated with a feed pipe 10, and the bottom of the rectifying tower 1 is communicated with a bottom extraction pipe 9. The gas outlet of the rectifying tower 1 is communicated with the gas inlet of the primary cooler 2 through a pipeline, the gas outlet of the primary cooler 2 is communicated with the gas inlet of the secondary cooler 3 through a pipeline, the gas outlet of the secondary cooler 3 is communicated with the gas inlet of the vacuum ejector 4, and gas generated in the rectifying process is discharged out of the rectifying tower 1 through the vacuum ejector 4.
The primary cooler 2 and the secondary cooler 3 are respectively provided with a cooling water inlet pipe 11 and a cooling water return pipe 12; the liquid outlet of the primary cooler 2 and the liquid outlet of the secondary cooler 3 are communicated with the liquid inlet of the reflux groove 6 through pipelines, and the light aromatic hydrocarbon condensate flows into the reflux groove 6 under the action of gravity after the gas discharged from the rectifying tower 1 is cooled by circulating cooling water; the liquid outlet of the reflux tank 6 is communicated with the liquid inlet of the rectifying tower 1 through a reflux pipeline 13, and the overhead extraction pipe 8 is communicated with the reflux pipeline 13 through a reflux pump 7; a primary sampler 201 and a primary moisture meter 202 are arranged on a pipeline which is communicated with the primary cooler 2 and the reflux tank 6 and are used for sampling and analyzing the water content of the product cooled by the primary cooler 2; a secondary sampler 301 and a secondary moisture meter 302 are arranged on a pipeline which is communicated with the secondary cooler 3 and the reflux tank 6 and are used for sampling and analyzing the water content of the product cooled by the secondary cooler 3; a three-stage sampler 801 and a three-stage moisture meter 802 are arranged on the tower top extraction pipe 8 and are used for sampling and analyzing the water content of the product after rectification and cooling.
The liquid inlet and the liquid outlet of the reboiler 5 are communicated with the rectifying tower 1 through pipelines. The shell side of the reboiler 5 is heated by steam, and is used as a bottom heat source of the rectifying tower 1, and the steam is cooled and then becomes condensate to be discharged; and the tube side of the reboiler 5 is the heavy aromatic component at the bottom of the tower, and the heat of the steam is transferred into the rectifying tower 1 through heat exchange of the reboiler 5. Reboiler 5 vaporizes the liquid in rectifying column 1 again and enters the cycle.
Working principle:
the mixed aromatic hydrocarbon enters the rectifying tower 1 through a feed inlet, and under the negative pressure rectifying operation, the light aromatic hydrocarbon in the mixed aromatic hydrocarbon is discharged from the top of the tower in a gas phase form and sequentially enters the primary cooler 2 and the secondary cooler 3. After cooling by the circulating cooling water, the light aromatic condensate flows into the reflux tank 6 under the action of gravity, and after being pressurized by the reflux pump 7, one part of the condensate is returned to the rectifying tower 1 to be used as reflux to adjust the temperature of the top of the tower, and the other part of the condensate is taken as the top of the tower to be taken out and sent to a product tank area for storage.
The gas which is discharged from the top of the tower and is not condensed after passing through the primary cooler 2 and the secondary cooler 3 is pumped and discharged through the vacuum ejector 4, so that the rectifying tower 1 is kept in a negative pressure state. The tower top product quality was periodically sampled and analyzed by a three-stage sampler 801 and a three-stage moisture meter 802, and the product water content standard used in this example was 0.5% ± 0.4%. When the analysis result shows that the water content is increased, the water content of the product is sampled and analyzed through the secondary sampler 301, the secondary moisture meter 302, the tertiary sampler 801 and the tertiary moisture meter 802 respectively. After comparing analysis results, when the water content of the product detected by one of the moisture meters is more than 1%, the cooler at the position is leaked, and plugging treatment is needed.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (3)
1. A rectification system for preparing durene from carbon dioxide is characterized by comprising a rectification tower, a primary cooler, a secondary cooler, a reflux tank, a primary sampler, a primary moisture meter, a secondary sampler, a secondary moisture meter, a tertiary sampler and a tertiary moisture meter;
the side wall of the rectifying tower is communicated with a feeding pipe, a top gas outlet of the rectifying tower is communicated with a gas inlet of the primary cooler through a pipeline, a gas outlet of the primary cooler is communicated with a gas inlet of the secondary cooler through a pipeline, and a gas outlet of the secondary cooler is communicated with a gas inlet of the vacuum ejector;
the liquid outlet of the primary cooler and the liquid outlet of the secondary cooler are communicated with the liquid inlet of the reflux tank through pipelines, the liquid outlet of the reflux tank is communicated with the liquid inlet of the rectifying tower through a liquid return pipeline, a reflux pump is arranged on the liquid return pipeline, and a tower top extraction pipe is communicated with the liquid return pipeline at the outlet of the reflux pump;
the primary sampler is communicated with a pipeline which is communicated with the primary cooler and the reflux tank, and the primary moisture meter is communicated with the primary sampler; the pipeline which is communicated with the secondary cooler and the reflux tank is communicated with the secondary sampler, and the secondary water meter is communicated with the secondary sampler; the tower top extraction pipeline is communicated with the three-stage sampler, and the three-stage sampler is communicated with the three-stage moisture meter.
2. The rectification system for producing durene from carbon dioxide according to claim 1, further comprising a reboiler, wherein a liquid inlet and a liquid outlet of the reboiler are communicated with the bottom of the rectification column through a pipeline.
3. The rectification system for producing durene from carbon dioxide as set forth in claim 1, wherein a bottom withdrawal pipe is connected to the bottom of said rectification column.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320240849.0U CN219376107U (en) | 2023-02-10 | 2023-02-10 | Rectification system for preparing durene from carbon dioxide |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320240849.0U CN219376107U (en) | 2023-02-10 | 2023-02-10 | Rectification system for preparing durene from carbon dioxide |
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| Publication Number | Publication Date |
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| CN219376107U true CN219376107U (en) | 2023-07-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202320240849.0U Active CN219376107U (en) | 2023-02-10 | 2023-02-10 | Rectification system for preparing durene from carbon dioxide |
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| Country | Link |
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| CN (1) | CN219376107U (en) |
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2023
- 2023-02-10 CN CN202320240849.0U patent/CN219376107U/en active Active
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