CN215609428U - Device for purifying propane and propylene - Google Patents
Device for purifying propane and propylene Download PDFInfo
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- CN215609428U CN215609428U CN202122034016.2U CN202122034016U CN215609428U CN 215609428 U CN215609428 U CN 215609428U CN 202122034016 U CN202122034016 U CN 202122034016U CN 215609428 U CN215609428 U CN 215609428U
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Abstract
The utility model belongs to the technical field of rectification and purification, and particularly relates to a device for purifying propane and propylene. The device comprises: the first rectifying tower, the second rectifying tower and the second rectifying tower kettle heater; the liquefied gas is firstly rectified in a first rectifying tower, high-purity propylene is obtained by collecting at the top of the tower, mixed liquid of propane and heavy components is obtained at the bottom of the tower, the mixed liquid continuously enters a second rectifying tower for rectification, propane is heated and gasified to be separated from the heavy components in a heater at the bottom of the second rectifying tower, and high-purity propane is extracted at the top of the second rectifying tower. This device adopts two tower rectification separation modes, not only can absorb the propane purification in the analytic method output liquefied gas with the aldehyde, can also effectively separate out propylene simultaneously, realizes carrying out the resourceization collection utilization to the material in the heavy component, and device simple structure, need not to introduce a large amount of adsorbents, and the running cost is low, more is fit for the industrialization application.
Description
Technical Field
The utility model belongs to the technical field of rectification and purification, and particularly relates to a device for purifying propane and propylene.
Background
The information in this background section is only for enhancement of understanding of the general background of the utility model and is not necessarily to be construed as an admission or any form of suggestion that this information forms the prior art that is already known to a person of ordinary skill in the art.
At present, a small amount of heavy components are carried in propane produced by an aldehyde absorption and desorption method, and the heavy components and the propane are layered in the using process, so that the using effect is influenced, and a large peculiar smell exists in the using process, so that the environment is influenced. Common methods for separating propane from liquefied gas mainly include chemical absorption and condensation adsorption:
chemical absorption-adsorption method: the basic idea of the process is to remove propylene impurities with high content and similar physical properties to propane by a chemical absorption method, remove residual hydrocarbon impurities such as propylene and the like by an adsorption method, and remove low boiling point impurities such as nitrogen, oxygen, methane, hydrogen and the like by a condensation method to prepare pure propane. Adsorptive separation is achieved by the adsorption of different components of a mixture onto the same solid substance (adsorbent).
Adsorption-condensation method: the principle is to extract propane from liquefied gas by adsorption-condensation separation technology. The components of the mixture are separated from each other by the ability of the surface energy of the adsorbent to selectively adsorb certain components from the fluid. The adsorbent of a certain type is selected as a purifying agent. It has the ability to preferentially adsorb polar molecules and unsaturated hydrocarbon molecules. The hydrocarbon impurities such as propylene, isobutane and the like in the raw materials are removed by adsorption, and the low-boiling-point impurities such as nitrogen, oxygen and the like are separated and removed by a condensation method, so that high-purity propane can be obtained.
The two methods can only obtain single propane, can not collect and utilize substances in the heavy components, and have the defects of large investment and high operation cost in the purification process.
SUMMERY OF THE UTILITY MODEL
The utility model provides a device for purifying propane and propylene, which adopts a double-tower rectification separation mode, not only can purify and purify propane in liquefied gas produced by an aldehyde absorption and desorption method, but also can effectively separate propylene, realizes resource collection and utilization of substances in heavy components, has simple structure, does not need to introduce a large amount of adsorbents, has low operation cost, and is more suitable for industrial application.
To achieve the object, the present invention provides an apparatus for purifying propane and propylene, comprising: the first rectifying tower, the second rectifying tower and the second rectifying tower kettle heater;
the liquefied gas is firstly rectified in a first rectifying tower, high-purity propylene is obtained by collecting at the top of the tower, mixed liquid of propane and heavy components is obtained at the bottom of the tower, the mixed liquid continuously enters a second rectifying tower for rectification, propane is heated and gasified to be separated from the heavy components in a heater at the bottom of the second rectifying tower, and high-purity propane is extracted at the top of the second rectifying tower.
One or more embodiments of the present invention have the following advantageous effects:
1) the device provided by the utility model not only can purify and purify propane in the liquefied gas produced by the aldehyde absorption and desorption method, but also can effectively separate propylene, thereby realizing resource collection and utilization of substances in the heavy component.
2) The device provided by the utility model has the advantages of simple structure, no need of introducing a large amount of adsorbents, low operation cost and suitability for industrial application.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the utility model, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the utility model and together with the description serve to explain the utility model and not to limit the utility model.
FIG. 1 is a schematic diagram showing the structure of an apparatus for purifying propane and propylene as proposed in example 1;
the system comprises a preheater 1, a first rectifying tower 2, a second rectifying tower 3, a second rectifying tower kettle heater 4, a reboiler 5, a first condenser 6, a propylene reflux tank 7, a propylene reflux pump 8, a propylene storage tank 9, a second condenser 10, a propane reflux tank 11, a propane reflux pump 12, a raffinate storage tank 13, a propane storage tank 14, a hot water storage tank 15 and a torch 16.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The present invention provides an apparatus for purifying propane and propylene, comprising: the first rectifying tower, the second rectifying tower and the second rectifying tower kettle heater;
the liquefied gas is firstly rectified in a first rectifying tower, high-purity propylene is obtained by collecting at the top of the tower, mixed liquid of propane and heavy components is obtained at the bottom of the tower, the mixed liquid continuously enters a second rectifying tower for rectification, propane is heated and gasified to be separated from the heavy components in a heater at the bottom of the second rectifying tower, and high-purity propane is extracted at the top of the second rectifying tower.
Wherein the liquefied gas is gas generated in the process of preparing propane by an aldehyde absorption and desorption method.
Furthermore, a preheater is arranged in front of a feed inlet of the first rectifying tower, and liquefied gas is heated by the preheater and then enters the first rectifying tower for rectification.
Further, a reboiler is arranged at the tower bottom of the first rectifying tower, and energy required by gasification of liquefied gas is provided.
In order to purify propylene obtained from the top of the first rectifying tower, the top of the first rectifying tower is also connected with a propylene reflux tank, a liquid-phase discharge port of the propylene reflux tank is connected with the first rectifying tower and a propylene storage tank, a gas phase extracted from the top of the first rectifying tower enters the propylene reflux tank to reflux, one part of reflux liquid serving as reflux liquid of the first rectifying tower refluxes to the top of the tower, and the other part of reflux liquid serving as a propylene product is collected in the propylene storage tank.
In order to purify propane obtained from the top of the second rectifying tower, the top of the second rectifying tower is connected with a propane reflux tank, a liquid-phase discharge port of the propane reflux tank is connected with the second rectifying tower and a propane storage tank, a gas phase extracted from the top of the second rectifying tower enters the propane reflux tank to reflux, one part of reflux liquid serving as reflux liquid of the second rectifying tower refluxes to the top of the tower, and the other part of reflux liquid serving as a propane product is collected in the propane storage tank.
And gas phase outlets of the propylene reflux tank and the propane reflux tank are connected with a torch, and the gas phase is discharged to the torch.
Further, a first condenser is arranged between the first rectifying tower and the propylene reflux tank, a second condenser is arranged between the second rectifying tower and the propane reflux tank, the condenser adopts circulating water to provide cold energy,
furthermore, reflux pumps are arranged at liquid phase discharge ports of the propylene reflux tank and the propane reflux tank;
in order to fully utilize the heat in the propane, a feeding preheater is arranged between the propane reflux tank and the propane storage tank, and after the liquefied gas raw material is heated by using the waste heat carried by the propane, the propane product is collected in the propane storage tank, so that the energy is saved.
Further, the preheater is a U-shaped plate heat exchanger, the shell side and the tube side of the preheater are both made of stainless steel, and the raw material flow passes through the tube side to exchange heat with the product propane to recover energy.
Further, a kettle heater of the second rectifying tower is a kettle heater, a partition plate is arranged in the kettle heater, heavy components and propane are separated in a layering mode, the heavy components are directly discharged and recovered as residual liquid, and propane overflows through the partition plate and is gasified through heating.
Example 1
As shown in fig. 1, the present invention provides an apparatus for purifying propane and propylene, comprising: the device comprises a preheater 1, a first rectifying tower 2 and a second rectifying tower 3; the preheater 1 is arranged at the feed inlet of the first rectifying tower 2, and the liquefied gas is heated by the preheater 1 and then enters the first rectifying tower 2 for rectification. And a reboiler 5 is arranged at the tower bottom of the first rectifying tower 2 and is used for providing energy required by gasification of liquefied gas. When the liquefied gas is rectified in the first rectifying tower 2, a high-purity propylene gas phase is collected at the top of the tower, a mixed liquid of propane and heavy components is obtained at the bottom of the tower, and the mixed liquid continuously enters the second rectifying tower 3 for rectification. The top of the first rectifying tower 2 is connected with a propylene reflux tank 7 through a first condenser 6, the gas phase extracted from the top of the first rectifying tower 2 enters the propylene reflux tank 7 to reflux, a discharge hole of the liquid phase of the propylene reflux tank 7 is connected with the first rectifying tower 2 and a propylene storage tank 9 through a propylene reflux pump 8, one part of reflux liquid refluxes to the top of the tower as the reflux liquid of the first rectifying tower 2, the other part of reflux liquid is collected in the propylene storage tank 9 as a propylene product, the gas phase outlet of the propylene reflux tank 7 is connected with a torch 16, and the gas phase is discharged to the torch 16.
In the second rectifying tower 3, a tower kettle is provided with a second rectifying tower kettle heater 4 (heated by hot water in a hot water storage tank 15), propane is heated and gasified and separated from heavy components, a high-purity propane gas phase is obtained at the top of the second rectifying tower, the top of the second rectifying tower 3 is connected with a propane reflux tank 11 through a second condenser 10, the gas phase extracted at the top of the second rectifying tower enters the propane reflux tank 11 for reflux, the gas phase outlet of the propane reflux tank is connected with a torch 16, the gas phase is emptied to the torch 16, the liquid phase outlet of the propane reflux tank 11 is connected with the second rectifying tower 3 and a preheater 1 through a propane reflux pump 12, one part of reflux liquid serving as reflux liquid of the second rectifying tower 3 reflows to the top of the tower, the other part enters the preheater 1 for heat exchange with initial liquefied gas, the liquefied gas is heated, the preheater 1 is connected with a propane storage tank 14, the reflux liquid after heat exchange is collected in a propane storage tank 14 as a propane product; the second rectifying tower kettle heater 4 is connected with a raffinate storage tank 13, and heavy components are directly taken as raffinate to be recovered in the raffinate storage tank 13.
The working process is as follows:
the liquefied gas is heated by a preheater 1, and firstly enters a first rectifying tower 2, under the action of a tower kettle reboiler 5 of the first rectifying tower 2, the propylene and propane in the liquefied gas are rectified and separated, the propylene with the purity of more than 99% is obtained by condensation at the top of the first rectifying tower, after the propylene flows back through a propylene reflux tank 7, the gas phase is discharged to a torch, the liquid phase partially enters the first rectifying tower 2, and the liquid phase partially serves as a propylene product and is collected to a propylene storage tank 9. The material at the bottom of first rectifying column 2 tower gets into second rectifying column 3, in second rectifying column cauldron heater 4, propane is heated gasification and is separated with the heavy ends, obtain the propane that purity is greater than 99% at the condensation of second rectifying column top, after propane reflux tank 11 refluxes, gaseous phase is emptied to the torch, liquid phase part gets into second rectifying column 3, the part is as getting into in preheater 1 and carrying out the heat transfer with the liquefied gas, propane storage tank 14 is collected to the reflux after the heat transfer, the heavy ends discharges to raffinate storage tank 13 bottom second rectifying column cauldron heater.
The above disclosure is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, therefore, the present invention is not limited by the appended claims.
Claims (10)
1. An apparatus for purifying propane and propylene, characterized by: the method comprises the following steps: the first rectifying tower, the second rectifying tower and the second rectifying tower kettle heater;
the liquefied gas is firstly rectified in a first rectifying tower, high-purity propylene is obtained by collecting at the top of the tower, mixed liquid of propane and heavy components is obtained at the bottom of the tower, the mixed liquid continuously enters a second rectifying tower for rectification, propane is heated and gasified to be separated from the heavy components in a heater at the bottom of the second rectifying tower, and high-purity propane is extracted at the top of the second rectifying tower.
2. The apparatus of claim 1, wherein: a preheater is arranged in front of a feed inlet of the first rectifying tower, and liquefied gas is heated by the preheater and then enters the first rectifying tower for rectification.
3. The apparatus of claim 1, wherein: the first rectifying tower kettle is provided with a reboiler.
4. The apparatus of claim 1, wherein: the top of the first rectifying tower is connected with a propylene reflux tank, a liquid-phase discharge port of the propylene reflux tank is connected with the first rectifying tower and a propylene storage tank, a gas phase extracted from the top of the first rectifying tower enters the propylene reflux tank to reflux, one part of reflux liquid serving as reflux liquid of the first rectifying tower refluxes to the top of the tower, and the other part of reflux liquid serving as a propylene product is collected in the propylene storage tank.
5. The apparatus of claim 4, wherein: the top of the second rectifying tower is connected with a propane reflux tank, a liquid-phase discharge port of the propane reflux tank is connected with the second rectifying tower and a propane storage tank, a gas phase extracted from the top of the second rectifying tower enters the propane reflux tank to reflux, one part of reflux liquid serving as reflux liquid of the second rectifying tower refluxes to the top of the tower, and the other part of reflux liquid serving as a propane product is collected in the propane storage tank.
6. The apparatus of claim 5, wherein: and gas phase outlets of the propylene reflux tank and the propane reflux tank are connected with a torch, and the gas phase is discharged to the torch.
7. The apparatus of claim 6, wherein: a first condenser is arranged between the first rectifying tower and the propylene reflux tank, and a second condenser is arranged between the second rectifying tower and the propane reflux tank.
8. The apparatus of claim 7, wherein: and reflux pumps are arranged at the liquid phase discharge outlets of the propylene reflux tank and the propane reflux tank.
9. The apparatus of claim 8, wherein: a feeding preheater is arranged between the propane reflux tank and the propane storage tank, and after the liquefied gas raw material is heated by using waste heat carried by propane, the propane product is collected in the propane storage tank.
10. The apparatus of claim 1, wherein: and the tower bottom heater of the second rectifying tower is a kettle heater, heavy components and propane are separated in layers in the tower bottom heater, and the heavy components are discharged from the bottom of the kettle heater.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122034016.2U CN215609428U (en) | 2021-08-26 | 2021-08-26 | Device for purifying propane and propylene |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122034016.2U CN215609428U (en) | 2021-08-26 | 2021-08-26 | Device for purifying propane and propylene |
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| CN215609428U true CN215609428U (en) | 2022-01-25 |
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| CN202122034016.2U Active CN215609428U (en) | 2021-08-26 | 2021-08-26 | Device for purifying propane and propylene |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114712883A (en) * | 2022-04-21 | 2022-07-08 | 大庆亿鑫化工股份有限公司 | Equipment and process for producing high-purity propane by using liquefied petroleum gas |
| CN115814445A (en) * | 2022-12-05 | 2023-03-21 | 江苏嘉宏新材料有限公司 | Device and method for purifying reflux tank of rectifying tower |
-
2021
- 2021-08-26 CN CN202122034016.2U patent/CN215609428U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114712883A (en) * | 2022-04-21 | 2022-07-08 | 大庆亿鑫化工股份有限公司 | Equipment and process for producing high-purity propane by using liquefied petroleum gas |
| CN115814445A (en) * | 2022-12-05 | 2023-03-21 | 江苏嘉宏新材料有限公司 | Device and method for purifying reflux tank of rectifying tower |
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