Rectification assembly for a rectification column

Abstract

The utility model belongs to alkylated oil desulfurization technical field especially relates to a rectifying assembly for rectifying column, including rectifying column, support, the support is installed in the outer surface of rectifying column, the rectifying column outside is provided with tower top backflow mechanism, the feed inlet of rectifying column is linked together with the bottom of de -n butane column, is used for receiving the fractionating oil of de -n butane column bottom. The rectifying assembly for rectifying column, by setting rectifying column body, tower top backflow structure, can be in the top of rectifying column and distill the low sulfur content product alkylated oil of more than 95% of de -n butane column bottom fraction, only need to handle the distillate of 5% or so rectifying column tower bottom, greatly reduced the processing capacity, is favorable to the smooth operation of alkylated device, and the influence of other index to alkylated oil is little, simultaneously, when the sulfur content of fractionating oil is low, can stop rectifying column operation, realized energy -conserving.

Description

Technical Field

[0001] This utility model relates to the field of alkylate desulfurization technology, specifically a distillation component for a distillation column. Background Technology

[0002] In alkylation units, the product separation section, as a core component, plays a crucial role in ensuring the quality of the final product. With the continuous upgrading of national requirements for energy conservation, emission reduction, and environmental protection, the quality standards for finished gasoline are becoming increasingly stringent, and low sulfur content has become one of the mandatory indicators. Alkylated oil, due to its irreplaceable role in optimizing gasoline structure, increasing the production of high-octane gasoline, and improving gasoline yield, has become an indispensable component in gasoline blending. Therefore, precise control of its sulfur content directly affects whether the finished gasoline meets the standards and holds a pivotal position in the entire production process.

[0003] In existing technology, the alkylated oil output from the bottom of the n-butane removal tower is directly sent to the product storage tank after cooling. This method has significant drawbacks. When the unit produces high-sulfur products, a separate storage tank is required to store the substandard oil. This substandard oil must undergo secondary refining before it can enter the qualified product storage tank. This not only leads to a significant increase in throughput and increases the unit's load rate, but also prolongs the process adjustment cycle, seriously affecting the stable operation of the unit. In addition, high-sulfur products have a strong corrosive effect on equipment, pipelines, and valves, significantly shortening their service life and increasing equipment maintenance costs, thus imposing an unnecessary economic burden on production. Utility Model Content

[0004] The purpose of this invention is to provide a distillation component for a distillation column to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a distillation assembly for a distillation column, comprising a distillation column and a support, wherein the support is installed on the outer surface of the distillation column, a top reflux mechanism is provided on the outer side of the distillation column, and the feed inlet of the distillation column is connected to the bottom of a n-butane removal column for receiving the distillate oil from the bottom of the n-butane removal column;

[0006] The top reflux structure includes a top reflux tank and a water cooler. A connecting pipe is provided at the top outlet of the distillation column, and the other end of the connecting pipe is connected to the water cooler. The top reflux tank is connected below the outlet of the water cooler. A reflux pump is provided on the side of the top reflux tank. The top reflux tank has two outlets. A reflux pipe is connected to the side of the top reflux tank. The top reflux tank is connected to the reflux port of the distillation column through the reflux pump. The other outlet of the top reflux tank is used to connect to an alkylate oil storage tank.

[0007] Preferably, the interior of the distillation column is provided with several ramps, which are spaced apart along the height of the distillation column.

[0008] Preferably, a level gauge is installed on the top reflux tank of the tower.

[0009] Preferably, a flow control valve is installed on the reflux pipe between the reflux pump and the reflux port of the distillation column.

[0010] Preferably, the bottom of the distillation column can be connected to an adsorption tank.

[0011] Preferably, the adsorption tank is filled with a desulfurization adsorbent.

[0012] Preferably, the desulfurization adsorbent is activated carbon or molecular sieve.

[0013] Preferably, the bottom of the distillation column is provided with a transport pipe, the other end of which is connected to a bottom reboiler, and the side of the bottom reboiler is connected to an inlet pipe.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This distillation column uses a distillation assembly. By setting up the column body and a top reflux structure, it can distill off alkylation oil, a low-sulfur product that accounts for more than 95% of the bottom fraction of the n-butane removal column, from the top of the column. Only about 5% of the high-sulfur product from the bottom fraction needs to be processed, which greatly reduces the throughput and is conducive to the stable operation of the alkylation unit. It also has little impact on other indicators of the alkylation oil. At the same time, the distillation column can be shut down when the sulfur content of the distillate is low, thus achieving energy saving. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall device of this utility model;

[0017] Figure 2 This is a process flow diagram of the present invention.

[0018] In the diagram: 1. Distillation column; 2. Support; 3. Connecting pipe; 4. Water cooler; 5. Top reflux tank; 6. Reflux tank; 7. Transport pipe; 8. Bottom reboiler. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] Please see Figures 1-2 This utility model provides a technical solution: a distillation assembly for a distillation column, including a distillation column 1 and a support 2. The support 2 is installed on the outer surface of the distillation column 1. A top reflux mechanism is provided on the outside of the distillation column 1. The feed inlet of the distillation column 1 is connected to the bottom of the n-butane removal column for receiving the distillate oil from the bottom of the n-butane removal column.

[0021] The top reflux structure includes a top reflux tank 5 and a water cooler 4. A connecting pipe 3 is provided at the top outlet of the distillation column 1, and the other end of the connecting pipe 3 is connected to the water cooler 4. The top reflux tank 5 is connected to the outlet of the water cooler 4. A reflux pump is provided on the side of the top reflux tank 5. The top reflux tank 5 has two outlets. A reflux pipe 6 is connected to the side of the top reflux tank 5. The top reflux tank 5 is connected to the reflux port of the distillation column 1 through the reflux pump. The other outlet of the top reflux tank 5 is used to connect to the alkylation oil storage tank.

[0022] The interior of the distillation column 1 is equipped with several ramps, which are distributed at intervals along the height of the distillation column 1, thereby further improving the distillation and separation effect of the device.

[0023] A level gauge is installed on the top reflux tank 5 to monitor the liquid level in the tank, so that operators can easily understand the material status inside the tank.

[0024] A flow control valve is installed on the reflux pipe 6 between the reflux pump and the reflux port of distillation column 1. The flow rate of the material refluxed into distillation column 1 can be controlled by setting the control valve to ensure the stability of the distillation process.

[0025] The bottom of distillation column 1 can be connected to an adsorption tank, so that after desulfurization in the adsorption tank, the product is cooled and transported to the storage tank.

[0026] The adsorption tank is filled with desulfurization adsorbent, which is used to desulfurize high-sulfur products.

[0027] The desulfurization adsorbent is activated carbon or molecular sieve, which has a good desulfurization effect.

[0028] The bottom of the distillation column 1 is provided with a transport pipe 7, and the other end of the transport pipe 7 is connected to the bottom reboiler 8. The side of the bottom reboiler 8 is connected to an inlet pipe 9. The bottom reboiler 8 can provide the heat required for distillation and promote the separation of distillate oil.

[0029] Working principle: The distillate oil from the bottom of the n-butane removal column enters distillation column 1, where it undergoes rectification and separation. The low-sulfur product flows out from the top outlet of distillation column 1, is cooled by water cooler 4, and then enters the top reflux tank 5. Part of the material in the top reflux tank 5 is returned to distillation column 1 by a reflux pump to ensure stable operation within distillation column 1; the other part enters the alkylation oil storage tank through the outlet of the top reflux tank 5.

[0030] The high-sulfur product flows out from the bottom outlet of distillation column 1 and enters the adsorption tank. After being adsorbed and desulfurized by the desulfurization adsorbent in the adsorption tank, it enters the cooler for cooling and finally enters the alkylated oil storage tank.

[0031] When the sulfur content of the bottom distillate oil of the alkylation de-butane tower is at a low level, the operation of distillation tower 1 can be stopped to achieve energy saving.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A distillation assembly for a distillation column, comprising a distillation column (1) and a support (2), characterized in that: The support (2) is installed on the outer surface of the distillation column (1). The distillation column (1) is provided with a top reflux structure on the outside. The feed inlet of the distillation column (1) is connected to the bottom of the n-butane removal column to receive the distillate oil from the bottom of the n-butane removal column. The top reflux structure includes a top reflux tank (5) and a water cooler (4). A connecting pipe (3) is provided at the top outlet of the distillation column (1). The other end of the connecting pipe (3) is connected to the water cooler (4). The top reflux tank (5) is connected to the outlet of the water cooler (4). A reflux pump is provided on the side of the top reflux tank (5). The top reflux tank (5) has two outlets. A reflux pipe (6) is connected to the side of the top reflux tank (5). The top reflux tank (5) is connected to the reflux port of the distillation column (1) through the reflux pump. The other outlet of the top reflux tank (5) is used to connect to the alkylation oil storage tank.

2. The distillation assembly for a distillation column according to claim 1, characterized in that: The interior of the distillation column (1) is provided with several mounting plates, which are distributed at intervals along the height direction of the distillation column (1).

3. A distillation assembly for a distillation column according to claim 1, characterized in that: A level gauge is installed on the top reflux tank (5).

4. A distillation assembly for a distillation column according to claim 1, characterized in that: A flow control valve is installed on the reflux pipe (6) between the reflux pump and the reflux port of the distillation column (1).

5. A distillation assembly for a distillation column according to claim 1, characterized in that: The bottom of the distillation column (1) can be connected to an adsorption tank.

6. A distillation assembly for a distillation column according to claim 5, characterized in that: The adsorption tank is filled with desulfurization adsorbent.

7. A distillation assembly for a distillation column according to claim 6, characterized in that: The desulfurization adsorbent is activated carbon or molecular sieve.

8. A distillation assembly for a distillation column according to claim 1, characterized in that: The bottom of the distillation column (1) is provided with a transport pipe (7), and the other end of the transport pipe (7) is connected to a bottom reboiler (8). The side of the bottom reboiler (8) is connected to an inlet pipe (9).

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