Small distillation column including cooling part

Abstract

The present invention provides a distillation column that comprises a plurality of distillation layers, each of which includes: an inlet port which is disposed on one side and through which oil vapor flows in; a first discharge port which is disposed on the other side and through which the oil vapor flows into a distillation layer disposed at the upper end of the distillation column in the height direction; a cooling unit which is disposed on the flow path of the oil vapor flowing in through the inlet port and discharged through the first discharge port, and reduces the temperature of the oil vapor; and a second discharge port which is disposed on the flow path of the oil vapor flowing between the cooling unit and the first discharge port, and through which a portion of the oil vapor lowered in temperature by the cooling unit is discharged to the outside.

Description

Small distillation column including cooling section

[0001] The present invention provides a distillation column structure that can be miniaturized by including a cooling unit capable of lowering the temperature of vapor circulating inside the distillation column.

[0002] A distillation column is a device that uses the principle of fractional distillation to separate a mixed liquid mixture based on the difference in boiling points. For example, the boiling point of water is 100℃, and that of ethanol is 78.1℃, a difference of more than 20℃. When the two liquids are mixed and heated, ethanol boils and vaporizes around 78.1℃, but water hardly vaporizes. At this time, because ethanol is vaporizing, the temperature of the entire solution does not rise significantly. Then, once all the ethanol has vaporized, the temperature begins to rise again, and when it reaches 100℃, water boils. In other words, collecting the gas coming out around 78.1℃ can yield ethanol, and collecting the gas coming out around 100℃ can yield water.

[0003] Distillation columns utilize the aforementioned principles and are used to separate crude oil. Crude oil contains a mixture of liquids with varying boiling points, including petroleum gas, gasoline, naphtha, kerosene, diesel, heavy oil, and lubricants. When these crude oils are placed at the bottom of a distillation column and heated, they can be separated based on differences in boiling points.

[0004] For example, if crude oil is heated to 500℃, the vaporized crude oil will rise to the top of the distillation column, and as it rises, its temperature will gradually decrease. For example, if the temperature drops below 380℃ at a height of 1 meter inside the distillation column, the lubricating oil will liquefy again and fall, so the lubricating oil in its gaseous state cannot exist above 1 meter.

[0005] By the same principle, if a temperature of 350℃ is formed at a height of 2m in a distillation tower, a temperature of 250℃ is formed at a height of 3m, a temperature of 180℃ is formed at a height of 4m, a temperature of 140℃ is formed at a height of 5m, and a temperature of 30℃ is formed below a height of 6m, then only petroleum gas can exist above 6m in the distillation tower, and only gasoline gas can exist between 5m and 6m.

[0006] The same goes for naphtha, kerosene, diesel, and heavy oil, and the locations where gases can exist are determined, and since the temperature is different at each layer of the distillation tower, liquids that vaporize at high temperatures can only be obtained at low locations in the distillation tower, and liquids that vaporize at low temperatures can be obtained at high locations in the distillation tower.

[0007] The conventional method of fractional distillation of crude oil involves extracting vaporized crude oil by cooling it in a natural state, so there was a problem in that it took a long time for the vaporized crude oil to cool, and the size of the distillation tower had to be very large to ensure sufficient cooling.

[0008] Therefore, the present invention aims to reduce the time consumed in the fractional distillation of crude oil and the size of the distillation tower by configuring a cooling unit capable of artificially cooling crude oil vaporized inside the distillation tower.

[0009] The present invention provides a distillation column comprising a plurality of distillation layers, each distillation layer comprising an inlet disposed on one side into which vapor is introduced, a first discharge portion disposed on the other side and which introduces vapor into the distillation layer disposed at the top in the height direction of the distillation column, a cooling portion disposed on a path of vapor introduced into the inlet portion and discharged through the first discharge portion to lower the temperature of the vapor, and a second discharge portion disposed on a path of vapor moving between the cooling portion and the first discharge portion to discharge a portion of the vapor, the temperature of which is lowered through the cooling portion, to the outside.

[0010] According to one embodiment, the cooling unit may include cooling fins that come into contact with the vapor and a refrigerant circulation unit that is disposed on one side of the cooling fins and circulates a refrigerant substance to one side of the cooling fins.

[0011] According to one embodiment, the distillation column has four distillation layers arranged in the height direction of the distillation column, and the vapor of a first predetermined temperature band is introduced into the first distillation layer, which is arranged at the lowest level in the height direction of the distillation column, through the inlet of the first distillation layer, and the vapor of a second predetermined temperature band, which is a temperature band lower than the first temperature band, can be discharged to the outside through the second discharge of the first distillation layer.

[0012] In one embodiment, the first temperature zone is 370°C to 400°C, the second temperature zone is 270°C to 370°C, and the vapor in the second temperature zone can be converted into diesel.

[0013] According to one embodiment, a second distillation layer is arranged on top of the first distillation layer in the height direction of the distillation column, and the vapor of the second temperature zone discharged through the second discharge portion of the first distillation layer is introduced into the second distillation layer through the inlet portion of the second distillation layer, and the vapor of a preset third temperature zone, which is a temperature zone lower than the second temperature zone, can be discharged to the outside through the second discharge portion of the second distillation layer.

[0014] In one embodiment, the third temperature zone is 120°C to 250°C, and the vapor in the third temperature zone can be converted into kerosene.

[0015] According to one embodiment, a third distillation layer is arranged on top of the second distillation layer in the height direction of the distillation column, and the vapor of the third temperature zone discharged through the second discharge portion of the second distillation layer is introduced into the third distillation layer through the inlet portion of the third distillation layer, and the vapor of a preset fourth temperature zone, which is a temperature zone lower than the third temperature zone, can be discharged to the outside through the second discharge portion of the third distillation layer.

[0016] In one embodiment, the fourth temperature zone is 70°C to 120°C, and the vapor in the fourth temperature zone can be converted into naphtha.

[0017] According to one embodiment, a fourth distillation layer is arranged on top of the third distillation layer in the height direction of the distillation column, and oil in the fourth temperature zone discharged through the second discharge port of the third distillation layer is introduced into the fourth distillation layer through the inlet port of the fourth distillation layer, and oil vapor in a preset fifth temperature zone, which is a temperature zone lower than the fourth temperature zone, can be discharged to the outside through the second discharge port of the fourth distillation layer.

[0018] In one embodiment, the fifth temperature zone is 20°C to 70°C, and the vapor in the fifth temperature zone can be converted into gasoline.

[0019] According to one embodiment, a base layer is arranged at the bottom of the first distillation layer in the height direction of the distillation column, and the base layer may include an inlet portion through which vapor is injected from the outside, an injection portion for injecting the vapor injected through the inlet portion into the inlet portion of the first distillation layer, and an outlet portion through which a fluid including impurities contained in the vapor injected from the outside is discharged to the outside of the distillation column.

[0020] According to one embodiment disclosed in the present invention, the vapor can be quickly cooled through the cooling fins, so that the time required for fractional distillation of the vapor can be reduced, and by minimizing the time required for fractional distillation, the size of the distillation column can be reduced, thereby minimizing the space required for installing the distillation column.

[0021] FIG. 1 is a drawing for explaining a distillation layer structure for fractional distillation according to one embodiment disclosed in the present invention.

[0022] FIG. 2 is a drawing for explaining a cooling unit structure according to one embodiment disclosed in the present invention.

[0023] FIG. 3 is a drawing for explaining a distillation column structure according to one embodiment disclosed in the present invention.

[0024] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. Throughout the description of each drawing, similar reference numerals have been used to designate similar components.

[0025] Terms such as first, second, A, and B may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another. For example, without departing from the scope of the present invention, a first component may be referred to as a second component, and similarly, a second component may also be referred to as a first component. The term "and / or" includes a combination of multiple related items described herein or any of multiple related items described herein.

[0026] When a component is referred to as being "connected" or "connected" to another component, it should be understood that it may be directly connected or connected to that other component, but that there may be other components intervening. Conversely, when a component is referred to as being "directly connected" or "connected" to another component, it should be understood that there are no other components intervening.

[0027] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0028] Unless otherwise defined, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Terms defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology, and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0029]

[0030] FIG. 1 is a drawing for explaining a distillation layer structure for fractional distillation according to one embodiment disclosed in the present invention.

[0031] According to one embodiment, the distillation column may be composed of a plurality of distillation layers, and each distillation layer (100) may include an inlet (110) disposed on one side to introduce vapor, a first discharge portion (120) disposed on the other side to introduce vapor into a distillation layer disposed at the top in the height direction of the distillation column (100), a cooling portion (130) disposed on a path of vapor introduced into the inlet portion (110) and discharged through the first discharge portion (120) to lower the temperature of the vapor, and a second discharge portion (140) disposed on a path of vapor moving between the cooling portion (130) and the first discharge portion (120) to discharge a portion of the vapor, the temperature of which has been lowered through the cooling portion (130), to the outside.

[0032] According to one embodiment, high-temperature vapor may be introduced through the inlet (110), and a portion of the vapor introduced through the inlet (110) may come into contact with the cooling portion (130) to lower its temperature. According to various embodiments, a portion of the vapor with a lowered temperature may be discharged through the second discharge portion (140) and captured in a tank located outside the distillation column to be converted into petroleum through a refining process.

[0033] According to one embodiment, the vapor discharged through the first discharge unit (120) may be introduced into the inlet of the distillation layer stacked on the upper side of the distillation layer (100) if the distillation layer is stacked on the upper side, and may be discharged to the outside of the distillation tower if the distillation layer is not stacked on the upper side of the distillation layer (100). According to various embodiments, cooling fins may be arranged in the cooling unit (130), and the temperature of the vapor introduced through the inlet (100) may be lowered using a water cooling method.

[0034] The specific structure of the cooling unit (130) will be described later with reference to FIG. 2. Meanwhile, FIG. 1 illustrates a case where the inlet unit (110), the first discharge unit (120), and the second discharge unit (140) are arranged on different surfaces in the distillation layer, but the scope of the present invention is not limited to the distillation layer structure illustrated in FIG. 1, and the inlet unit (110), the first discharge unit (120), and the second discharge unit (140) may be arranged in various spaces as needed.

[0035]

[0036] FIG. 2 is a drawing for explaining a cooling unit structure according to one embodiment disclosed in the present invention.

[0037] According to one embodiment, the cooling unit (200) may include a cooling fin (210) that comes into contact with the vapor and a refrigerant circulation unit (220) that is arranged on one side of the cooling fin (210) and circulates a refrigerant substance to one side of the cooling fin (210). According to various embodiments, the refrigerant circulation unit (200) may include a refrigerant inlet unit (230) through which refrigerant is introduced and a refrigerant discharge unit (240) through which refrigerant is discharged to the outside.

[0038] In one embodiment, cooling fins (210) may be positioned along a path through which vapor flows to lower the temperature of the vapor. In various embodiments, the number of cooling fins (210) or the temperature of the refrigerant circulating through the refrigerant circulation unit (220) may be changed depending on the temperature range to be cooled through the cooling unit (200).

[0039] That is, according to the present invention, the temperature of the vapor passing through the cooling fins (210) can be lowered as much as desired by the user by controlling the number or structure of the distillation fins (210) constituting the cooling unit (200) and the temperature of the refrigerant circulating through the refrigerant circulation unit (220), thereby extracting vapor in a desired temperature range from each distillation layer to obtain petroleum (e.g., kerosene) in a desired form.

[0040]

[0041] FIG. 3 is a drawing illustrating a distillation column structure according to one embodiment disclosed in the present invention. Meanwhile, FIG. 3 illustrates a case where the distillation column is configured with four distillation layers, but the scope of the present invention is not limited to the structure illustrated in FIG. 3, and the distillation layers may be changed as needed.

[0042] According to one embodiment, the distillation column (300) may include a plurality of distillation layers (320, 330, 340, 350). According to various embodiments, each of the distillation layers (320, 330, 340, 350) may be stacked in the height direction of the distillation column (300), and the base layer (310) may be arranged at the bottom of the layer stacked at the lowest level in the height direction of the distillation column.

[0043] According to one embodiment, the base layer (310) may include an inlet portion (311) through which vapor is introduced from the outside, an injection portion (315) for injecting the vapor introduced through the inlet portion (311) into the inlet portion of the first distillation layer (320), and an outlet portion (313) through which a fluid including impurities included in the vapor introduced from the outside is discharged to the outside of the distillation column (300). According to various embodiments, the vapor introduced through the inlet portion (311) may have a high temperature of 400° C. or higher.

[0044] According to one embodiment, the first distillation layer (320) disposed on the upper side of the base layer (310) may include an inlet of the first distillation layer disposed on one side into which vapor is introduced, a first discharge portion (325) of the first distillation layer disposed on the other side into which vapor is introduced into a second distillation layer (330) stacked on the upper side of the first distillation layer (320), a cooling portion disposed on a path of movement of vapor introduced into the inlet portion of the first distillation layer and discharged through the first discharge portion (325) of the first distillation layer to lower the temperature of the vapor, and a second discharge portion (326) of the first distillation layer disposed on a path of movement of vapor moving between the cooling portion and the first discharge portion (325) of the first distillation layer to discharge a portion of the vapor, the temperature of which is lowered through the cooling portion, to the outside. According to various embodiments, the inlet may be connected to the discharge portion (313) of the base layer so that the vapor discharged through the discharge portion (313) of the base layer may be directly introduced into the first distillation layer (320) without being discharged to the outside.

[0045] According to one embodiment, a bubble cap may be formed at the inlet of the first distillation layer, and the vapor may be broken into small bubbles through the bubble cap to increase the contact area between gas and liquid within the distillation column and prevent backflow. According to various embodiments, the cooling unit of the first distillation layer may include cooling fins (321), a refrigerant circulation unit (322), a refrigerant inlet unit (323), and a refrigerant discharge unit (324). The specific structure and operation of the cooling unit will be described with reference to FIG. 2.

[0046] According to one embodiment, the vapor introduced through the inlet of the first distillation layer has a temperature drop as it passes through the cooling fins (321), and a portion of the vapor with a lowered temperature is discharged to the outside of the distillation column through the second discharge portion (326) of the first distillation layer. According to various embodiments, the temperature range of the vapor discharged through the second discharge portion (326) of the first distillation layer may be 270°C to 370°C. Meanwhile, the vapor discharged through the second discharge portion (326) of the first distillation layer may be extracted as diesel fuel through a refining process.

[0047] According to one embodiment, a portion of the vapor passing through the cooling fins (321) of the first distillation layer may move to the second distillation layer (330) through the first discharge port (325) of the first distillation layer. According to various embodiments, the first discharge port (325) of the first distillation layer may be connected to the inlet port of the second distillation layer so that the vapor discharged through the first discharge port (325) of the first distillation layer may be directly introduced into the second distillation layer (330) without being discharged to the outside.

[0048] According to one embodiment, the second distillation layer (330) may include an inlet of the second distillation layer disposed on one side into which vapor is introduced, a first discharge portion (335) of the second distillation layer disposed on the other side into which vapor is introduced into a third distillation layer (340) stacked on top of the second distillation layer (330), a cooling portion disposed on a path of vapor that is introduced into the inlet portion of the second distillation layer and discharged through the first discharge portion (335) of the second distillation layer to lower the temperature of the vapor, and a second discharge portion (336) of the second distillation layer disposed on a path of vapor that moves between the cooling portion and the first discharge portion (335) of the second distillation layer to discharge a portion of the vapor, the temperature of which is lowered through the cooling portion, to the outside. According to various embodiments, a bubble cap may be formed on the inlet portion of the second distillation layer. Meanwhile, a specific description of the bubble cap and the cooling portion provided in the second distillation layer replaces the description of the bubble cap and the cooling portion provided in the first distillation layer.

[0049] According to one embodiment, the vapor introduced through the inlet of the second distillation layer has a temperature drop as it passes through the cooling fins (331), and a portion of the vapor with a lowered temperature is discharged to the outside of the distillation column through the second discharge port (336) of the second distillation layer. According to various embodiments, the temperature range of the vapor discharged through the second discharge port (336) of the second distillation layer may be 120°C to 250°C. Meanwhile, the vapor discharged through the second discharge port (336) of the second distillation layer may be extracted as kerosene through a purification process.

[0050] According to one embodiment, some of the vapor passing through the cooling fins (331) of the second distillation layer may move to the third distillation layer (340) through the first discharge port (335) of the second distillation layer. According to various embodiments, the first discharge port (335) of the second distillation layer may be connected to the inlet port of the third distillation layer so that the vapor discharged through the first discharge port (335) of the second distillation layer may be directly introduced into the third distillation layer (340) without being discharged to the outside.

[0051] According to one embodiment, the third distillation layer (340) may include an inlet of the third distillation layer disposed on one side into which vapor is introduced, a first discharge portion (345) of the third distillation layer disposed on the other side into which vapor is introduced into a fourth distillation layer (350) stacked on top of the third distillation layer (340), a cooling portion disposed on a path of vapor introduced into the inlet portion of the third distillation layer and discharged through the first discharge portion (345) of the third distillation layer to lower the temperature of the vapor, and a second discharge portion (346) of the third distillation layer disposed on a path of vapor moving between the cooling portion and the first discharge portion (345) of the third distillation layer to discharge a portion of the vapor, the temperature of which is lowered through the cooling portion, to the outside. According to various embodiments, a bubble cap may be formed on the inlet portion of the third distillation layer. Meanwhile, a specific description of the bubble cap and the cooling portion provided in the third distillation layer replaces the description of the bubble cap and the cooling portion provided in the first distillation layer.

[0052] According to one embodiment, the vapor introduced through the inlet of the third distillation layer has a temperature drop as it passes through the cooling fins (341), and a portion of the vapor with a lowered temperature is discharged to the outside of the distillation column through the second discharge port (346) of the third distillation layer. According to various embodiments, the temperature range of the vapor discharged through the second discharge port (346) of the third distillation layer may be 70°C to 120°C. Meanwhile, the vapor discharged through the second discharge port (346) of the third distillation layer may be extracted as naphtha through a purification process.

[0053] According to one embodiment, some of the vapor passing through the cooling fins (341) of the third distillation layer may move to the fourth distillation layer (350) through the first discharge port (345) of the third distillation layer. According to various embodiments, the first discharge port (345) of the third distillation layer may be connected to the inlet port of the fourth distillation layer so that the vapor discharged through the first discharge port (345) of the third distillation layer may be directly introduced into the fourth distillation layer (350) without being discharged to the outside.

[0054] According to one embodiment, the fourth distillation layer (350) may include an inlet of the fourth distillation layer disposed on one side into which vapor is introduced, a first discharge portion (355) of the fourth distillation layer disposed on the other side to discharge vapor to the outside of the distillation column (300), a cooling portion disposed on a path of vapor that is introduced into the inlet portion of the fourth distillation layer and discharged through the first discharge portion (355) of the fourth distillation layer to lower the temperature of the vapor, and a second discharge portion (356) of the fourth distillation layer disposed on a path of vapor that moves between the cooling portion and the first discharge portion (355) of the fourth distillation layer to discharge a portion of the vapor, the temperature of which is lowered through the cooling portion, to the outside. Meanwhile, a specific description of the cooling portion provided in the fourth distillation layer replaces the description of the bubble cap and cooling portion provided in the first distillation layer.

[0055] According to one embodiment, the vapor introduced through the inlet of the fourth distillation layer has a temperature drop as it passes through the cooling fins (351), and a portion of the vapor with a lowered temperature is discharged to the outside of the distillation column through the second discharge port (356) of the fourth distillation layer. According to various embodiments, the temperature range of the vapor discharged through the second discharge port (356) of the fourth distillation layer may be 20°C to 70°C. Meanwhile, the vapor discharged through the second discharge port (346) of the third distillation layer may be extracted as gasoline through a refining process.

[0056] According to one embodiment, by arranging a cooling unit capable of cooling vapor in each distillation layer constituting the distillation column, the space required to cool the vapor can be drastically reduced. Even when considering the space occupied by the cooling unit in the distillation layer, the size of the distillation column can be reduced by arranging the cooling unit.

[0057]

[0058] The above description is merely an illustrative illustration of the technical idea of ​​the present invention, and those skilled in the art will appreciate that various modifications and variations can be made without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate, rather than limit, the technical idea of ​​the present invention, and the scope of the technical idea of ​​the present invention is not limited by these embodiments. The scope of protection of the present invention should be interpreted by the following claims, and all technical ideas within a scope equivalent thereto should be interpreted as being included in the scope of the rights of the present invention.

Claims

1. In a distillation tower including multiple distillation layers, Each distillation layer. An inlet located on one side through which steam flows in; A first discharge unit that is arranged on the other side and introduces vapor into a distillation layer arranged at the top in the height direction of the distillation tower; A cooling unit positioned on the path of movement of the vapor introduced into the inlet and discharged through the first discharge unit to lower the temperature of the vapor; and It is characterized by including a second discharge unit disposed on the path of movement of the steam moving between the cooling unit and the first discharge unit, and through which a portion of the steam, the temperature of which has been lowered through the cooling unit, is discharged to the outside. Distillation tower.

2. In paragraph 1, The above cooling unit, Cooling fins in contact with the above vapor; and It is characterized by including a refrigerant circulation unit disposed on one side of the cooling fin and circulating refrigerant material to one side of the cooling fin. Distillation tower.

3. In paragraph 1, The above distillation tower has four distillation layers arranged in the height direction of the distillation tower, The first distillation layer, which is arranged at the lowest level in the height direction of the distillation tower, is characterized in that vapor of a first temperature band is introduced through an inlet of the first distillation layer, and vapor of a second temperature band, which is a temperature band lower than the first temperature band, is discharged to the outside through a second discharge of the first distillation layer. Distillation tower.

4. In paragraph 3, The first temperature band is 370°C to 400°C, the second temperature band is 270°C to 370°C, and the vapor of the second temperature band is characterized in that it is converted into diesel. Distillation tower.

5. In paragraph 3, A second distillation layer is arranged on top of the first distillation layer in the height direction of the distillation tower, In the second distillation layer, the vapor of the second temperature band discharged through the second discharge portion of the first distillation layer is introduced through the inlet portion of the second distillation layer, and the vapor of a preset third temperature band, which is a temperature band lower than the second temperature band, is discharged to the outside through the second discharge portion of the second distillation layer. Distillation tower.

6. In paragraph 5, The third temperature band is 120°C to 250°C, and the vapor in the third temperature band is characterized in that it is converted into kerosene. Distillation tower.

7. In paragraph 5, A third distillation layer is arranged on top of the second distillation layer in the height direction of the distillation tower, In the third distillation layer, the vapor of the third temperature band discharged through the second discharge portion of the second distillation layer is introduced through the inlet portion of the third distillation layer, and the vapor of the preset fourth temperature band, which is a temperature band lower than the third temperature band, is discharged to the outside through the second discharge portion of the third distillation layer. Distillation tower.

8. In paragraph 7, The fourth temperature band is 70°C to 120°C, and the vapor in the fourth temperature band is characterized in that it is converted into naphtha. Distillation tower.

9. In paragraph 7, A fourth distillation layer is arranged on top of the third distillation layer in the height direction of the distillation tower, In the fourth distillation layer, oil of the fourth temperature band discharged through the second discharge portion of the third distillation layer is introduced through the inlet portion of the fourth distillation layer, and oil vapor of a preset fifth temperature band, which is a temperature band lower than the fourth temperature band, is discharged to the outside through the second discharge portion of the fourth distillation layer. Distillation tower.

10. In paragraph 9, The fifth temperature band is 20°C to 70°C, and the vapor in the fifth temperature band is characterized in that it is converted into gasoline. Distillation tower.

11. In paragraph 3, A base layer is arranged at the bottom of the first distillation layer in the height direction of the distillation tower, The above base layer is, An entrance section where vapor enters from the outside; An injection unit that injects the vapor introduced through the above-mentioned entrance unit into the inlet of the first distillation layer; and A distillation column characterized in that it includes a discharge port through which a fluid containing impurities contained in the vapor sprayed from the outside is discharged to the outside of the distillation column. Distillation tower.

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