Rectifying tower capable of achieving segmented feeding

Abstract

The utility model relates to the technical field of rectifying towers, in particular to a rectifying tower capable of feeding in sections, which is characterized in that different feed ports and discharge ports are additionally arranged at different positions of the rectifying tower, so that a temperature range suitable for separation can be quickly found when different raw materials are separated, the material separation efficiency is improved, and the product yield is improved. Meanwhile, different distillation ranges can be selected according to different raw material properties, so that the energy consumption is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of distillation towers, in particular to a distillation tower capable of feeding in sections. Background Art

[0002] In many industrial fields such as chemical, petroleum, and pharmaceuticals, distillation towers play a vital role in separating mixtures by utilizing the different distillation points of substances in the mixture.

[0003] The main components of a distillation tower include a tower body, tower plates or fillers, a top condenser, a bottom reboiler, etc. The interior is filled with tower plates or fillers for increasing the gas-liquid contact area. The mixture is heated at the bottom of the tower, the light components vaporize and rise, and the heavy components remain in the liquid phase and fall. The rising gas phase undergoes multiple partial condensations and partial vaporizations in the tower, so that the light components are gradually enriched at the top of the tower, and the heavy components are enriched at the bottom of the tower, and are extracted as products from the bottom and top of the tower respectively.

[0004] For different raw materials, the initial quality of the raw materials is different, and the separation process required in the distillation tower is also different. For example, for raw materials with more complex ingredients in the product, multi-stage differentiation is required in the distillation tower to achieve the purpose of obtaining the product. For raw materials with a higher content of light components, it is not necessary to achieve the effect of gas-liquid separation at a higher temperature. Therefore, for different products, the density and separation distillation range of the products are different. If the same distillation process is carried out in the distillation tower, it will not only consume more energy, but also reduce the output efficiency of the product.

[0005] Patent CN 220125533 U discloses a segmented distillation tower, which includes a distillation tower body, a support frame, a lifting device and a fixing device. The lifting device controls the depth of a monitoring rod with a temperature detection device inserted into the distillation tower body, so that the temperature of each segment can be accurately obtained by using the temperature detection device at the bottom of the monitoring rod. Although such a setting solves the problem that when using a conventional distillation tower, the temperature of each segment is different due to the high tower body, and specific products can be drawn out at different segments, the optimal temperature for achieving the separation level is different for different materials. If a new raw material is replaced, the overall temperature of the distillation tower needs to be changed, and the temperature at different positions needs to be re-measured, which does not fundamentally improve the efficiency of product output.

[0006] Therefore, there is a need for a distillation tower with segmented feeding. By selecting different feed ports for raw materials of different properties, the distillation steps of the raw materials in the distillation tower can be reduced, thereby achieving the purpose of energy saving and improving product output efficiency. Utility Model Content

[0007] In order to solve the problems mentioned in the background technology and overcome the above shortcomings, the utility model provides the following technical solutions:

[0008] A distillation tower capable of segmented feeding comprises a main distillation tower, wherein a cold reflux device is provided at the top of the distillation tower, and a tower top product outlet is provided; a reboiler is provided at the bottom of the distillation tower, and a tower bottom product outlet is provided.

[0009] The distillation tower is provided with several layers of packing, and different packing layers constitute separate packing sections. The distillation tower can be provided with several packing sections according to different heights, and the distillation tower is divided into several areas from top to bottom according to the height distribution of the packing sections;

[0010] Furthermore, the height of the packing layer in the distillation tower is 20-25 cm, and every 6-14 layers of packing constitute a packing section;

[0011] Further, the height of each packing section is 1.5-3.5 meters, and the height of each packing section can be the same or different;

[0012] Furthermore, the distillation tower is provided with 4 packing sections;

[0013] Furthermore, the interval between each packing section in the distillation tower is 1.6 meters to 2 meters;

[0014] Furthermore, the distillation tower is divided into 3-6 areas from top to bottom according to the height of each 1-2 packing sections;

[0015] Furthermore, the distillation tower is divided into five areas from top to bottom, namely, the tower top area, the feed a area, the feed b area, the feed c area, and the feed d area;

[0016] The distillation tower is divided into several areas, and feed ports are respectively arranged according to the position of each packing layer, and several discharge ports that are the same in number as the feed ports may be arranged, or no additional discharge ports may be arranged;

[0017] Furthermore, according to the position of the packing section, four feed ports are provided on the distillation tower, namely, feed port a, feed port b, feed port c, and feed port d, and no additional discharge port is provided;

[0018] Such a design facilitates the selection of a suitable feed port for feeding according to the distillation range of different raw materials, so that the raw materials can be separated as quickly as possible at a suitable temperature through the packing section in the distillation tower; if each feed port is provided with a corresponding discharge port, the product can be directly output, and such a design will increase the modification cost of the traditional distillation tower, so it is also possible to choose not to add a discharge port, and only use the original top product output port at the top of the distillation tower and the bottom product output port at the bottom of the tower to collect the light component product and the heavy component product, that is, the distillation tower includes at least two discharge ports, namely, the top product output port at the top of the distillation tower and the bottom product output port at the bottom of the tower;

[0019] Different feed ports are set at different heights, corresponding to different temperatures on the packing section in the distillation tower. A temperature sensor is provided at the feed port, and the temperature of different feed ports can be observed by the temperature sensor. Combined with the temperature of the upper and lower adjacent feed ports, a suitable feed port is selected for feeding according to the density and distillation range of the raw materials.

[0020] By adding feed ports in different areas of the distillation tower, the entire distillation tower does not need to be cooled down even when the distillation tower is in continuous operation. In the process of separating different raw materials, it is only necessary to determine the distillation range of the raw materials and select a feed port with a suitable temperature.

[0021] Compared with the prior art, the beneficial effects of the utility model are:

[0022] 1. Compared with conventional distillation towers, the distillation tower is divided into several areas according to the height distribution of the packing section in the distillation tower, and a feed port is added in each area according to demand. The feed port of a conventional distillation tower is located above the first layer of tower plate or the packing layer at the bottom of the distillation tower. Compared with conventional distillation towers, since feed ports are added at different positions on the distillation tower, the corresponding temperature can be selected for distillation according to the properties of the raw materials, thereby improving the efficiency of the distillation tower, improving the separation accuracy of the distillation tower, and reducing the energy consumption of the distillation tower.

[0023] 2. Temperature sensors are installed at different feed ports on the distillation tower to facilitate observation by staff. The staff can select appropriate feed ports for the raw materials based on production experience, shorten the distillation range of the raw materials, and do not need to adjust the temperature of the distillation tower as a whole when distilling and separating different raw materials. The temperature sensor can be used to directly select the appropriate temperature for feeding. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a schematic diagram of the distillation tower structure of Example 1 of the utility model;

[0025] Figure 2 This is a schematic diagram of the structure of a distillation tower capable of segmented feeding according to Example 2 of the present invention;

[0026] Figure 3 This is a schematic diagram of the structure of a distillation tower capable of segmented feeding according to Example 3 of the present invention;

[0027] Figure 4 This is a schematic diagram of the structure of a distillation tower capable of segmented feeding according to Example 2 of the present invention;

[0028] 1-feed port a, 2-feed port b, 3-feed port c, 4-feed port d, 5-top product outlet, 6-bottom product outlet, 7-distillation tower, 8-cold reflux device, 9-reboiler, 10-discharge port h, 11-discharge port i. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0031] Example 1

[0032] like Figure 1 As shown, the distillation tower 7 is provided with 4 packing layers, and each packing section is composed of a different number of packing layers from top to bottom. The thickness of the packing sections are 2 meters, 2.5 meters, 2.5 meters, and 3 meters from bottom to top, respectively, and the interval between adjacent packing sections is 2 meters.

[0033] A feed inlet a1 is provided on the distillation tower 7, and the feed inlet a1 is located near the second packing section at the bottom of the distillation tower 7, so that the only feed inlet a1 is arranged at a relatively central position, and the light component product of the raw material fed from the feed inlet a1 is delivered from the top product output port 5 arranged at the top of the tower, and the heavy component product is delivered from the bottom product output port 6 located at the bottom of the tower.

[0034] The heat in the distillation tower 7 is dissipated from bottom to top step by step by the heat generated by the hot oil heating in the reboiler 9 arranged at the bottom of the tower, so that different packing layers can achieve the purpose of gas-liquid separation at different temperatures.

[0035] A cold reflux device 8 is provided on the top of the distillation tower 7. When the quality of the product sent out from the top product outlet 5 at the top of the tower does not meet the requirements, the light component product can be sent back, the cold reflux device 8 is opened to cool the top of the tower, and the returned light component product is distilled and separated again, and the obtained light component product is sent out again through the top product outlet 5, and the separated heavy component product flows into the bottom of the tower and is sent out from the bottom product outlet 6.

[0036] Example 2

[0037] As described in Example 1, the distillation tower 7 is only provided with one feed inlet. Different materials must go through the same distillation process when being separated. However, there are great differences in properties such as density between different materials. Therefore, the temperature required for separation of the mixture is also different. In order to meet the separation conditions of the materials, the overall temperature of the distillation tower 7 needs to be regulated, and a lot of time and energy are required in this process.

[0038] like Figure 2 As shown, the distillation tower 7 is provided with 4 packing sections, each packing section from top to bottom is composed of different numbers of packing layers, the thickness of the packing sections from bottom to top are 2 meters, 2.5 meters, 2.5 meters, 3 meters, respectively, and the interval between adjacent packing sections is 2 meters. On the basis of Example 1, the body of the distillation tower 7 is divided into 4 areas according to the heights of the positions of different packing sections, and the feed ports of different areas are respectively set according to the positions of the packing sections, which are feed port c 3, feed port b 2, feed port a 1, feed port d 4 from top to bottom, and a temperature sensor is separately provided at the feed port to facilitate operators to observe the temperature and temperature changes at different positions.

[0039] The light component products generated from the raw materials fed from different feed ports are sent out from the top product outlet 5 arranged at the top of the tower, and the heavy component products are sent out from the bottom product outlet 6 located at the bottom of the tower.

[0040] By improving and adding a feed port on the basis of Example 1, the cost of transformation can be reduced. At the same time, by improving the distillation tower 7, when different raw materials are fed, the operator can choose a feed port with a suitable temperature for feeding based on experience, shortening the distillation range of the material and improving the separation efficiency of the material.

[0041] In addition, the temperature of each area of ​​the distillation tower 7 can be controlled by the bottom reboiler 9 and the top cold reflux device 8 without changing the overall temperature of the distillation tower 7, thus saving energy.

[0042] Example 3

[0043] On the basis of Example 2, the distillation tower 7 can be further improved.

[0044] In Example 2, there are two outlets for the final product, namely, a top product outlet 5 at the top of the tower and a bottom product outlet 6 at the bottom of the tower. Different outlets can be added on this basis.

[0045] like Figure 3 As shown, the distillation tower 7 is divided into four areas with different temperatures, and a feed port is separately set in each area. Discharge ports can also be added in different areas. For example, a discharge port h10 can be added in the area corresponding to the feed port b2. The light component product separated from the raw materials fed from the feed ports c3 and b2 can be delivered from the top product output port 5 at the top of the tower, and the additional discharge port h10 can deliver the heavy component product obtained by separation.

[0046] It is also possible to add a discharge port in the area corresponding to the feed port a1, such as Figure 4 As shown, the light component product obtained by separating the raw materials fed in by the feed port a1 and the feed port d4 is sent out from the newly added discharge port i11. If the sent light component product does not meet the requirements, it can be directly sent back to the top of the tower through the pipeline. It can be separated by the packing layer at the top of the tower first, or the cold reflux device 8 can be directly opened to separate the returned light component product again and send it out through the tower top product output port 5; the separated heavy component product is sent out through the tower bottom product output port 6.

[0047] The above two solutions can also be combined according to production needs, or different discharge ports can be added in different areas to meet production needs.

[0048] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A distillation tower capable of staged feeding, comprising a main distillation tower (7), a cold reflux device (8) being provided at the top of the distillation tower (7), and a reboiler (9) being provided at the bottom of the tower, characterized in that: The distillation tower (7) is provided with a packing section composed of a plurality of layers of packing, and the distillation tower (7) is divided into a plurality of regions according to the height of the packing section, and a plurality of feed ports are respectively provided in different regions; the distillation tower (7) is provided with at least two discharge ports, namely a top product discharge port (5) located at the top of the distillation tower (7) and a bottom product discharge port (6) located at the bottom of the distillation tower (7).

2. A distillation tower capable of staged feeding as claimed in claim 1, characterized in that: The height of the packing layer in the distillation tower (7) is 20-25 cm, and every 6-14 packing layers constitute a packing section.

3. A distillation tower capable of staged feeding as claimed in claim 1, characterized in that: The distillation tower (7) is provided with four packing sections, and the height of each packing section is 1.5-3.5 meters.

4. A distillation tower capable of being fed in stages according to any one of claims 2 or 3, characterized in that: The interval between each packing section in the distillation tower (7) is 1.6 m to 2 m.

5. A distillation tower capable of staged feeding as claimed in claim 1, characterized in that: The distillation tower is divided into 3-6 areas from top to bottom according to the height of each 1-2 packing sections, and each area is provided with a feed inlet.

6. A distillation tower capable of staged feeding as claimed in claim 5, characterized in that: The distillation tower (7) is divided into five areas from top to bottom, each of which is provided with four feed ports, namely, feed port c (3), feed port b (2), feed port a (1), and feed port d (4) from top to bottom.

7. A distillation tower capable of staged feeding as claimed in claim 6, characterized in that: The feed ports: feed port c (3), feed port b (2), feed port a (1), and feed port d (4) are each individually provided with a temperature sensor.

Images