1, 3-butadiene four-section packing concentration tower

Abstract

The utility model belongs to the technical field of 1, 3-butadiene concentration, and discloses a 1, 3-butadiene four-section filler concentration tower which comprises a tower body, four sections of fillers which are arranged up and down at equal intervals are arranged in the tower body, gas distributors are arranged at the bottoms of the fillers, a liquid distributor is arranged above the uppermost filler, and a liquid distributor is arranged above the uppermost filler. A liquid redistributor is arranged between every two vertically adjacent fillers, a gas inlet pipe is fixedly connected to one side of the tower body, the gas inlet pipe is arranged below the lowest filler, a gas outlet pipe is connected to the top of the tower body, the gas distributor comprises corrugated plates, and each corrugated plate is welded and fixed with a bottom supporting plate of the corresponding filler; the surface of the corrugated plate is in an uneven corrugation shape, through holes are evenly distributed in the corrugated plate, 1, 3-butadiene gas is evenly distributed through the corrugated plate, full contact between the 1, 3-butadiene gas and liquid in the filler is better facilitated, the corrugated plate can also serve as a supporting plate of the filler, and therefore part of the structure is omitted.

Description

Technical Field

[0001] The utility model belongs to the technical field of 1,3-butadiene concentration, in particular to a 1,3-butadiene four-stage filling concentration tower. Background Art

[0002] 1,3-Butadiene is an organic compound. At room temperature and pressure, 1,3-butadiene is a colorless gas with a special odor, similar to that of gasoline or petroleum. Its boiling point is -4.4°C. Its low boiling point makes it easy to vaporize at room temperature, which is also an important physical property basis for its separation and purification by distillation and other methods in chemical production.

[0003] The 1,3-butadiene four-stage packing concentration tower is a tower equipment with a multi-layer packing structure. Based on the difference in equilibrium distribution coefficients of different components in the gas-liquid phase, the solubility of 1,3-butadiene and other impurities in the gas phase and the liquid phase is different. When the gas phase and the liquid phase contact on the surface of the packing, the solute (1,3-butadiene) will be transferred from the gas phase to the liquid phase (absorption process), and some volatile impurities in the liquid phase will be transferred to the gas phase (desorption process). In the concentration tower, the gas and liquid usually adopt a countercurrent operation mode, that is, the gas enters from the bottom of the tower and flows upward, and the liquid enters from the top of the tower and flows downward. This countercurrent operation can make the concentration difference between the gas and liquid phases can be effectively utilized in the whole tower. For example, near the bottom of the tower, the concentration of 1,3-butadiene in the liquid phase is higher, while the concentration of 1,3-butadiene in the gas phase entering at this time is relatively low, which can promote the further transfer of 1,3-butadiene from the gas phase to the liquid phase, thereby improving the concentration effect.

[0004] In the prior art, due to the high packing layer, the gas and liquid in the tower body will appear uneven during the flow process, which affects the full contact between the gas and the liquid, and further affects the concentration of 1,3-butadiene.

[0005] Therefore, in order to solve the above problems, a 1,3-butadiene four-stage packing concentration tower is proposed. Utility Model Content

[0006] In order to solve the problems raised in the above background technology, the utility model provides a 1,3-butadiene four-stage packing concentration tower, which has the advantages of multiple distribution of gas and liquid, so that the gas and liquid are evenly distributed to ensure that the gas and liquid are fully in contact in the packing, which is beneficial to the concentration of 1,3-butadiene.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a 1,3-butadiene four-stage packing concentration tower, comprising a tower body, wherein four sections of packings arranged equidistantly from top to bottom are installed in the tower body, a gas distributor is arranged at the bottom of each packing, a liquid distributor is arranged above the top packing, and a liquid redistributor is arranged between two adjacent packings, an air inlet pipe is fixedly connected to one side of the tower body, the air inlet pipe is arranged below the bottom packing, and an air outlet pipe is connected to the top of the tower body;

[0008] The bottom of the tower body is fixedly connected to a liquid collecting hopper, the bottom of the liquid collecting hopper is provided with a liquid discharge port, the liquid collecting hopper is fixedly connected to a support leg, and a reinforcement rod is fixedly connected between adjacent support legs. The gas distributor includes a plurality of corrugated plates, each corrugated plate is welded and fixed to the bottom support plate of its corresponding filler, the surface of the corrugated plate presents an uneven corrugated shape and is evenly provided with through holes, the through holes are arranged in an equilateral triangle shape, and the opening rate of the through holes is between 35% and 42%; the corrugated plate can evenly distribute the gas, which is more conducive to full contact between the gas and the liquid in the filler, and the gas distributor can also serve as a support plate for the filler, thereby eliminating part of the structure and saving production costs.

[0009] Preferably, the liquid distributor comprises a main flow guide pipe, both sides of which are connected with branch flow guide pipes, and a liquid outlet is installed at the bottom of the branch flow guide pipes.

[0010] Preferably, one end of the flow guide main pipe passes through the tower body and is fixedly connected with a liquid inlet interface.

[0011] Preferably, the liquid redistributor comprises a circular plate, on which are penetrated evenly distributed thick guide tubes and thin guide tubes, the top of the thick guide tubes extends upward for a certain distance, and the bottom of the thin guide tubes extends downward for a certain distance. For a concentration tower with a large number of packing layers, the liquid redistributor is used to prevent uneven flow of liquid in the packing layer, so that the liquid can be more effectively redistributed to the next section of packing.

[0012] Compared with the prior art, the beneficial effects of the utility model are as follows:

[0013] 1. The utility model adopts a corrugated plate design by setting a gas distributor, and the surface of the corrugated plate is evenly provided with through holes, so that the gas is evenly distributed and the intake pressure is kept constant, which is more conducive to the full contact between the gas and the liquid in the packing, and the gas distributor can also be used as a support plate for the packing, thereby eliminating part of the structure and saving production costs;

[0014] 2. The utility model provides a liquid redistributor. For a concentration tower with a large number of packing layers, the liquid redistributor is used to prevent the liquid from flowing unevenly in the packing layer, so that the liquid can be redistributed to the next section of packing more effectively. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic diagram of the internal structure of the tower body of the utility model;

[0017] Figure 3 This is a schematic diagram of the structure of the gas distributor of the utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the liquid redistributor of the utility model;

[0019] Figure 5 This is a schematic diagram of the bottom structure of the liquid distributor of the utility model.

[0020] In the figure: 1. tower body; 2. filler;

[0021] 3. gas distributor; 301. corrugated plate; 302. through hole;

[0022] 4. Liquid distributor; 401. diversion main pipe; 402. diversion branch pipe; 403. liquid outlet;

[0023] 5. Liquid redistributor; 501. Round plate; 502. Thick guide tube; 503. Thin guide tube;

[0024] 6. Air inlet pipe; 7. Air outlet pipe; 8. Liquid collecting bucket; 9. Liquid drain port; 10. Support leg; 11. Reinforcement rod; 12. Liquid inlet interface. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0026] like Figures 1 to 5As shown, the utility model provides a 1,3-butadiene four-stage packing concentration tower, including a tower body 1, in which four sections of packing 2 are equidistantly arranged up and down are installed, each section of packing 2 is 3 meters high, and the number of theoretical plates of packing 2 per meter is ≥ four. The packing 2 is a high-efficiency wire mesh packing 2, the wire diameter shall not be less than 0.6mm, the minimum pore size is 0.6mm, and the average pore size is ≥0.75mm. A gas distributor 3 is provided at the bottom of the packing 2 to evenly distribute the gas, which is more conducive to full contact between the gas and the liquid in the packing 2, and the gas distributor 3 can also be used as a support plate for the packing 2, thereby eliminating part of the structure and saving production costs. A liquid distributor 4 is provided above the packing 2 at the top, and a liquid redistributor 5 is provided between two adjacent packings 2 above and below. An air inlet pipe 6 is fixedly connected to one side of the tower body 1, and the air inlet pipe 6 is located at the lower end of the bottommost packing 2. An air outlet pipe 7 is connected to the top of the tower body 1.

[0027] Specifically, a liquid collecting bucket 8 is fixedly connected to the bottom of the tower body 1, and a liquid discharge port 9 is provided at the bottom of the liquid collecting bucket 8. The liquid collecting bucket 8 can collect the falling liquid and introduce the liquid into the tower kettle through the liquid discharge port 9. The liquid collecting bucket 8 is fixedly connected to a support leg 10, and a reinforcement rod 11 is fixedly connected between adjacent support legs 10 for supporting the structure of the tower body 1. The gas distributor 3 includes a plurality of corrugated plates 301, each corrugated plate 301 is welded and fixed to the bottom support plate of the corresponding filler 2, and the surface of the corrugated plate 301 presents an uneven corrugated shape and is evenly provided with through holes 302, which are arranged in an equilateral triangle shape, and the opening rate of the through holes 302 is between 35% and 42%, the wave height is 100 mm, and the aperture of the through holes 302 is set to 3 mm. The corrugated plate 301 can evenly distribute the 1,3-butadiene gas flowing upward, so that when the 1,3-butadiene gas passes through the through holes 302, the merging of bubbles is reduced, and the 1,3- The butadiene gas is evenly distributed over the entire cross section of the corrugated plate 301, thereby improving the uniformity of its distribution. At the same time, the design of the corrugated plate helps to reduce the pressure loss of 1,3-butadiene gas when it flows. The liquid in the packing 2 flows downward to the corrugated plate 301 and then flows to the circular plate below. The corrugated plate 301 guides the liquid, thereby ensuring that the 1,3-butadiene gas is fully in contact with the liquid, thereby improving the concentration effect of 1,3-butadiene. At the same time, the corrugated plate 301 can also serve as a supporting structure at the bottom of the packing 2, saving equipment space and reducing production costs.

[0028] It is worth noting that the liquid distributor 4 includes a flow guide main pipe 401, and flow guide branch pipes 402 are connected to both sides of the flow guide main pipe 401. A liquid outlet 403 is installed at the bottom of the flow guide branch pipe 402. The liquid introduced into the tower body 1 is evenly distributed through the liquid distributor 4 and flows downward into the first section of filler 2 to ensure that the gas and liquid can fully contact in the first section of filler 2.

[0029] It is worth noting that one end of the flow guide main pipe 401 passes through the tower body 1 and is fixedly connected with a liquid inlet interface 12, and the liquid inlet interface 12 can be connected to the external source of liquid for concentrating 1,3-butadiene.

[0030] It is worth mentioning that the liquid redistributor 5 includes a circular plate 501, on which are evenly distributed thick guide tubes 502 and thin guide tubes 503. The top of the thick guide tubes 502 extends upward for a certain distance, and the bottom of the thin guide tubes 503 extends downward for a certain distance. For a concentration tower with a large number of packings 2, it is used to prevent the liquid from flowing unevenly in the packing 2, so that the liquid can be more effectively redistributed to the next section of packing 2.

[0031] Working principle and process: 1,3-butadiene mixed gas is introduced into the tower body 1 through the air inlet pipe 6, and the liquid used to concentrate 1,3-butadiene is introduced into the liquid distributor 4 through the liquid inlet interface 12, and flows out from the liquid outlet 403 after passing through the diversion main pipe 401 and the diversion branch pipe 402. The gas and liquid are then contacted in the filler 2 to concentrate 1,3-butadiene. The concentrated liquid falls into the liquid collecting bucket 8, and the remaining gas is discharged from the air outlet pipe 7. The tower top pressure control adopts split-range control, and the regulating valve controls the flow of supplementary nitrogen and circulating water respectively. When the pressure in the tower is insufficient, nitrogen is supplemented; when the pressure in the tower is insufficient, the nitrogen is supplemented; when the pressure in the tower is insufficient, the nitrogen is supplemented. When the pressure is high, adjust the water volume of the top condenser to control the condensation volume and the temperature after cooling. The top pressure control range is 220~320kPa.G. The gas distributor 3 can serve as a support plate for the packing 2, thereby eliminating part of the structure and saving production costs. It can also distribute the gas evenly, which is more conducive to full contact between the gas and the liquid in the packing 2. For the concentration tower with more packing 2, the liquid redistributor 5 is used to prevent the liquid from flowing unevenly in the packing 2, so that the liquid can be more effectively redistributed to the next section of the packing 2, which is beneficial to the concentration of 1,3-butadiene.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 1,3-butadiene four-stage packing concentration tower, comprising a tower body (1), wherein four sections of packing (2) are installed in the tower body (1) and are arranged equidistantly from top to bottom, a gas distributor (3) is provided at the bottom of each packing (2), a liquid distributor (4) is provided above the top packing (2), and a liquid redistributor (5) is provided between two adjacent packings (2) above and below, an air inlet pipe (6) is fixedly connected to one side of the tower body (1), and the air inlet pipe (6) is located below the bottom packing (2), and an air outlet pipe (7) is connected to the top of the tower body (1); The bottom of the tower body (1) is fixedly connected to a liquid collecting hopper (8), the bottom of the liquid collecting hopper (8) is provided with a liquid discharge port (9), the liquid collecting hopper (8) is fixedly connected to a supporting leg (10), and a reinforcing rod (11) is fixedly connected between adjacent supporting legs (10), characterized in that: The gas distributor (3) comprises a plurality of corrugated plates (301), each corrugated plate (301) being welded and fixed to a bottom support plate of a corresponding filler (2), the surface of the corrugated plate (301) presenting an uneven corrugated shape and evenly distributed with through holes (302), the through holes (302) being arranged in an equilateral triangle shape, and the opening rate of the through holes (302) being between 35% and 42%.

2. A 1,3-butadiene four-stage packed concentration tower according to claim 1, characterized in that: The liquid distributor (4) comprises a main flow guide pipe (401), both sides of which are connected to branch flow guide pipes (402), and a liquid outlet (403) is installed at the bottom of the branch flow guide pipe (402).

3. A 1,3-butadiene four-stage packed concentration tower according to claim 2, characterized in that: One end of the flow guide main pipe (401) passes through the tower body (1) and is fixedly connected to a liquid inlet interface (12).

4. A 1,3-butadiene four-stage packed concentration tower according to claim 3, characterized in that: The liquid redistributor (5) comprises a circular plate (501), through which evenly distributed thick guide tubes (502) and thin guide tubes (503) are passed, the top of the thick guide tubes (502) extending upwards by a certain distance, and the bottom of the thin guide tubes (503) extending downwards by a certain distance.

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