Rectification apparatus for high-purity nitrous oxide

Abstract

The utility model relates to the technical field of chemical production especially is concerned with high -purity nitrous oxide's rectifying device, including following steps: step one, selects crude nitrous oxide purity 99.5wt%, under the conveyance of pump body to the heavy tower A conveyance, step two, the heavy tower reboiler C hot side import temperature is 40~‑50 DEG C, and the hot side export temperature is 30~40 DEG C, and the heavy tower condenser B cold side import temperature is 30~‑40 DEG C, and the cold side export temperature is 20~‑25 DEG C, step three, most nitrous oxide and other light components are transported to the light tower D through the heavy tower condenser B's no. A export and no. Light component pipeline, step four, the hot side import temperature of the light tower reboiler F is 40~‑50 DEG C, step five, nitrous oxide and other light components are separated, and the separated nitrous oxide is condensed in the light tower condenser E, it has improved the working efficiency of the heavy tower A and the light tower D, has improved the purity and stability of nitrous oxide simultaneously.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical production, and in particular to a distillation apparatus for high-purity nitrous oxide. Background Technology

[0002] With the development of the LED and semiconductor industries, high-purity nitrous oxide is an important raw material in the electronics industry, and its demand is constantly increasing, with higher requirements for its purity. Currently, the main purification processes for nitrous oxide in industry are adsorption, filtration, and distillation.

[0003] In industrial applications, the distillation of nitrous oxide mainly uses a single-tower process. In actual operation, gaseous nitrous oxide is condensed into liquid in the condenser of the distillation tower. Light component impurities flow out from the top of the tower, while some heavy component impurities flow out with the liquid nitrous oxide. This affects the purity of nitrous oxide, and the removal of impurities from nitrous oxide by a single tower is unstable.

[0004] The tray assembly of a distillation column is the core component of the distillation column. In existing tray assemblies, the contact time between the liquid and gaseous phases is relatively short, resulting in a low separation rate. To achieve better separation, it is necessary to extend the contact time between the gas and liquid phases to improve separation efficiency. Furthermore, if too much liquid flows in, it may be difficult for the liquid to pass through the sieve holes on the tray quickly, causing some liquid to remain on the tray for an extended period. This phenomenon results in material loss and significantly increases production costs. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a distillation apparatus for high-purity nitrous oxide that reduces production costs and improves product precision.

[0006] The distillation process for high-purity nitrous oxide includes the following steps: Step 1: Select crude nitrous oxide with a purity of 99.5 wt% and transport it to the deweighting tower A under the conveying of the pump. The feed flow rate of crude nitrous oxide is 600 kg / h, the feed temperature is 25℃, and the pressure is 20 bar. Step 2: The hot side inlet temperature of the reboiler C in the deweight removal tower is 40℃~-50℃, and the hot side outlet temperature is 30℃~40℃. The cold side inlet temperature of the condenser B in the deweight removal tower is -30℃~-40℃, and the cold side outlet temperature is -20℃~-25℃. Step 3: Most of the nitrous oxide and other light components are transported to the light component removal tower D through outlet A of condenser B in the heavy component removal tower and the light component pipeline. A small portion of the nitrous oxide and other light components are returned to the interior of heavy component removal tower A through outlet B of condenser B in the heavy component removal tower and the return pipeline B. Step 4: The hot side inlet temperature of the reboiler F for removing light weights is 40℃~-50℃, the hot side outlet temperature of the reboiler F for removing light weights is 30℃~40℃, the cold side inlet temperature of the condenser E for removing light weights is -30℃~-40℃, and the cold side outlet temperature of the condenser E for removing light weights is -20℃~-25℃. Step 5: Nitrous oxide is separated from other light components. The separated nitrous oxide enters the condenser E of the light component removal tower for condensation. Most of the condensed nitrous oxide is discharged through outlet No. 2A and the No. 2 light component pipeline on condenser E, while a small portion of the condensed nitrous oxide is returned to the light component removal tower D through outlet No. 2B and the No. 2B reflux pipeline on condenser E. A pump is used to transport crude nitrous oxide with a purity of 99.5wt% to the heavy component removal tower A. The reboiler C of the heavy component removal tower A heats the crude nitrous oxide inside the heavy component removal tower A. Nitrous oxide, other light components, and heavy components are separated inside the heavy component removal tower A. After being condensed in the heavy component removal tower condenser B, the nitrous oxide and other light components enter the light component removal tower D through pipelines. The condensed nitrous oxide is separated from the other light components inside the light component removal tower D. The separated gaseous nitrous oxide enters the light component removal tower condenser E for further condensation. Most of the nitrous oxide is transported to the high-purity storage tank through outlet No. 2A on the light component removal tower condenser E and pipeline No. 2. The condensed nitrous oxide is returned to the light component removal tower D through outlet No. 2B on the light component removal tower condenser E and pipeline No. 2B return. This improves the working efficiency of the heavy component removal tower A and the light component removal tower D, and also enhances the purity and stability of nitrous oxide.

[0007] Preferably, in step one, the theoretical number of trays in the deweight removal tower A is 50~60, the reflux ratio is 1~2, the top temperature is -17℃~-18℃, the bottom temperature is -17℃~-18℃, and the crude nitrous oxide feed position is at tray 54~60.

[0008] Preferably, in step three, the theoretical number of trays in the light component removal tower D is 50~60, the reflux ratio is 30~40, the top temperature is -18℃~-19℃, the bottom temperature is -18℃~-19℃, and the feed positions for nitrous oxide and other light components are at trays 3~9.

[0009] A high-purity nitrous oxide distillation apparatus includes a heavy component removal column A, a heavy component removal column condenser B, a heavy component removal column reboiler C, a light component removal column D, a light component removal column condenser E, and a light component removal column reboiler F. The top of the heavy component removal column A is connected to the heavy component removal column condenser B via a pipeline. The No. 1 outlet A on the heavy component removal column condenser B is connected to the input end of the No. 1 light component pipeline. The No. 1 outlet B on the heavy component removal column condenser B is connected to the input end of the No. 1 B reflux pipeline. The output end of the No. 1 B reflux pipeline is connected to the upper part of the heavy component removal column A. The bottom of the heavy component removal column A is connected to the heavy component removal column reboiler C via a pipeline. The output end of the No. 1 light component pipeline is connected to the input end of the light component removal column D. The top of the light component removal tower D is connected to the light component removal tower condenser E via a pipeline. The No. 2A outlet of the light component removal tower condenser E is connected to the input end of the No. 2 light component pipeline. The No. 2B outlet of the light component removal tower condenser E is connected to the input end of the No. 2B reflux pipeline. The output end of the No. 2B reflux pipeline is connected to the upper part of the light component removal tower D. The bottom of the light component removal tower D is connected to the light component removal tower reboiler F via a pipeline. Nitrous oxide gas feedstock enters the heavy component removal tower A and then enters the heavy component removal tower condenser B via a pipeline. Nitrous oxide and other light components are transported to the light component removal tower D through the No. 1A outlet and the No. 1 light component pipeline of the heavy component removal tower condenser B. Heavy components are condensed and transported through the No. 1B outlet and the No. 1B reflux pipeline of the heavy component removal tower B. After entering the heavy component removal tower A via the feed line, the product flows along the pipeline into the reboiler C of the heavy component removal tower. In the reboiler C, it is heated into a gas and repeatedly purified by distillation to remove heavy component impurities from the nitrous oxide feedstock, yielding the primary separation product. The heavy component impurities at the bottom of the heavy component removal tower A are discharged through the drain outlet. The primary separation product enters the light component removal tower D, where it is condensed in the light component removal tower condenser E. Light component impurities with boiling points higher than nitrous oxide are transported to the high-purity storage tank through outlet No. 2A of the light component removal tower condenser E and the No. 2 light component pipeline. The crude nitrous oxide product is returned to the light component removal tower D through outlet No. 2B and the No. 2B reflux pipeline, where it is heated into a gas in the reboiler F of the light component removal tower and repeatedly purified by distillation to obtain liquid nitrous oxide.

[0010] Preferably, the reboiler C of the de-weighting tower is provided with a No. C outlet connected to the input end of the No. C reflux line, and the output end of the No. C reflux line is connected to the lower part of the de-weighting tower A.

[0011] Preferably, the reboiler F of the light-light-removal tower is provided with outlet No. 2C connected to the inlet of reflux line No. 2C, and the outlet of reflux line No. 2C is connected to the lower part of the light-light-removal tower D.

[0012] Preferably, both the heavy removal tower A and the light removal tower D include multiple tower sections, and a distillation tower tray assembly block is provided between two adjacent tower sections.

[0013] Preferably, the distillation column tray assembly includes a tray, triangular blocks, fasteners, upper sieve holes, and lower sieve holes. The tray includes an upper sieve plate and a lower sieve plate, which are connected by fasteners. The upper sieve plate has multiple upper sieve holes, with the hole diameter gradually decreasing from top to bottom. The lower sieve plate has multiple sets of lower sieve holes, with the hole diameter gradually increasing from top to bottom. The lower sieve plate has multiple triangular blocks, and the axis of the upper sieve hole is aligned with the axis of the lower sieve hole. The lines are arranged in an interlaced pattern; the liquid in the distillation column enters the trays through the upper sieve holes due to gravity. Several triangular baffles act as buffers, slowing down the forward velocity of the liquid phase and prolonging the time for heat and mass exchange between the liquid and gas phases. Each tray is installed at a 22.5-degree angle to the horizontal plane, and the angle between adjacent trays is 45 degrees. This design allows the liquid phase to flow downwards by gravity without being too fast, and the inclined trays also maximize the surface area for liquid flow and the time for gas phase to rise within the same floor space. The triangular baffle, designed to be narrower at the top and wider at the bottom, facilitates heat and mass exchange with the liquid phase. This design slows down the liquid flow without preventing it from flowing down completely. Following a normal distribution, the majority of the liquid phase will flow to the larger apertures of the lower sieve plate before moving to the next tray, preventing any residual liquid from being trapped and wasting material. The apertures of the upper sieve gradually decrease from top to bottom, facilitating the smooth and rapid entry of the liquid phase into the tray. Conversely, the apertures of the lower sieve gradually increase from top to bottom, ensuring that most of the liquid phase flows through the larger apertures. Multiple triangular baffles are required for the liquid phase to enter the next tray, delaying the time it takes for the liquid phase to enter the next tray and extending the heat and mass exchange time. The staggered arrangement of the upper and lower sieve holes further prolongs the contact time between the gas and liquid phases, resulting in better separation. Furthermore, the number of trays in the distillation column can be adjusted according to the properties of different materials, making it suitable for various production needs. The open area ratio and diameter range of the trays can also be adjusted to avoid affecting output due to excessively large or small openings.

[0014] Preferably, the number of trays is not less than four sets and the trays are stacked alternately. The two adjacent sets of trays are at a 45-degree angle to each other and are fixedly connected by welding. The angle between the trays and the horizontal is 22.5 degrees.

[0015] Preferably, the exterior of the upper screen plate and the exterior of the lower screen plate are fixedly connected by welding. The upper screen plate is provided with upper screen hole screw holes, and the lower screen plate is provided with lower screen hole screw holes. The fastener screws are threadedly connected to a set of lower screen hole screw holes and a set of upper screen hole screw holes respectively.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: A pump body is used to transport crude nitrous oxide with a purity of 99.5 wt% to the interior of the heavy removal tower A. The reboiler C of the heavy removal tower heats the crude nitrous oxide inside the heavy removal tower A. Nitrous oxide, other light components and heavy components are separated inside the heavy removal tower A. The gaseous nitrous oxide and other light components are condensed by the heavy removal tower condenser B and then enter the light removal tower D through pipelines. The condensed nitrous oxide and other light components are separated inside the light removal tower D. The separated gaseous nitrous oxide enters the light removal tower condenser E for condensation. Most of the nitrous oxide is transported to the high-purity storage tank through the No. 2 A outlet and the No. 2 light component pipeline on the light removal tower condenser E. A small portion of the condensed nitrous oxide is returned to the light removal tower D through the No. 2 B outlet and the No. 2 B return pipeline on the light removal tower condenser E. This improves the working efficiency of the heavy removal tower A and the light removal tower D, and at the same time improves the purity and stability of nitrous oxide. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the distillation apparatus of this utility model; Figure 2 This is a schematic diagram of the structure of a distillation column tray assembly; Figure 3 This is a top view of the upper sieve plate. Figure 4 This is a top view of the lower sieve plate. Figure 5 The diagram shows a top view of the tower plate.

[0018] The following labels are used in the attached diagram: 1. Tray; 2. Upper sieve plate; 3. Lower sieve plate; 4. Triangular stop block; 5. Fastener screw; 6. Upper sieve hole; 7. Lower sieve plate screw hole; 8. Lower sieve hole; 9. Upper sieve hole screw hole; 111. Heavy removal tower A; 112. Heavy removal tower condenser B; 113. Heavy removal tower reboiler C; 114. Light removal tower D; 115. Light removal tower condenser E; 116. Light removal tower reboiler F. Detailed Implementation

[0019] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete.

[0020] Example 1 like Figure 1 As shown, the high-purity nitrous oxide distillation apparatus of this invention has a crude nitrous oxide content of 99.5%, a feed flow rate of 600 kg / h, a feed temperature of 28°C, and a feed pressure of 20 bar. Crude gaseous nitrous oxide is fed from the 55th tray of the heavy phase removal column A111 with a reflux ratio of 1.2 and undergoes rectification. The top temperature of the heavy phase removal column A111 is -17℃ and the bottom temperature is 35℃. The gaseous components at the top of the column are condensed by the heavy phase removal column condenser B112. The heavy components are condensed into liquid phase and refluxed to the rectification column at a flow rate of 700 kg / h. The light phase gaseous components are collected from the top of the column and sent to the light phase removal column D114 at a flow rate of 580 kg / h. The light vapor component is fed from the fifth tray of the light vapor removal tower D114 with a reflux ratio of 35 and undergoes distillation. The top temperature of the light vapor removal tower D114 is -17℃ and the bottom temperature is 35℃. The vapor at the top of the light vapor removal tower D114 is condensed by the light vapor removal tower condenser E115, and 99.99995% high-purity nitrous oxide product is collected from the bottom of the tower. The collected product is transferred to a high-purity storage tank.

[0021] After testing, the component content of high-purity nitrous oxide is as follows:

[0022] Example 2 like Figure 1 As shown, the distillation apparatus for high-purity nitrous oxide of this invention has a crude nitrous oxide content of 99.5%, a feed flow rate of 600 kg / h, a feed temperature of 28°C, and a feed pressure of 20 bar.

[0023] Crude gaseous nitrous oxide is fed from the 55th tray of the heavy phase removal column A111 with a reflux ratio of 1.1 for distillation. The top temperature of the heavy phase removal column A111 is -17℃, and the bottom temperature is 35℃. The top vapor is condensed by the heavy phase removal column condenser B112. The heavy components are condensed into liquid phase and refluxed back to the heavy phase removal column A111 at a flow rate of 720 kg / h. The gaseous light components are collected from the top of the column and sent to the light phase removal column D114 at a flow rate of 650 kg / h.

[0024] The gaseous component is fed from the fifth tray of the light-light removal tower D114 with a reflux ratio of 37 and undergoes distillation. The top temperature of the light-light removal tower D114 is -17℃ and the bottom temperature is 35℃. The top vapor is condensed by the reboiler F116 of the light-light removal tower, and 99.99995% high-purity nitrous oxide product is collected from the bottom of the tower. The collected product is transferred to a high-purity storage tank.

[0025] After testing, the component content of high-purity nitrous oxide is as follows:

[0026] Example 3 like Figures 1 to 5As shown, the high-purity nitrous oxide distillation apparatus of this invention includes a heavy component removal column A111, a heavy component removal column condenser B112, a heavy component removal column reboiler C113, a light component removal column D114, a light component removal column condenser E115, and a light component removal column reboiler F116. The top of the heavy component removal column A111 is connected to the heavy component removal column condenser B112 via a pipeline. The No. A outlet of the heavy component removal column condenser B112 is connected to the input end of the No. 1 light component pipeline. The No. B outlet of the heavy component removal column condenser B112 is connected to the input end of the No. 1 B reflux pipeline. The output end of the No. 1 B reflux pipeline is connected to the upper part of the heavy component removal column A111. The bottom of the heavy component removal column A111 is connected to the heavy component removal column reboiler C113 via a pipeline. The output end of the No. 1 light component pipeline is connected to the input end of the light component removal column D114. The top of the light component removal tower D114 is connected to the light component removal tower condenser E115 via a pipeline. The No. 2A outlet of the light component removal tower condenser E115 is connected to the input end of the No. 2 light component pipeline. The No. 2B outlet of the light component removal tower condenser E115 is connected to the input end of the No. 2B reflux pipeline. The output end of the No. 2B reflux pipeline is connected to the upper part of the light component removal tower D114. The bottom of the light component removal tower D114 is connected to the light component removal tower reboiler F116 via a pipeline. The reboiler C113 of the de-weighting tower is equipped with a No. C outlet connected to the input end of the No. C reflux line, and the output end of the No. C reflux line is connected to the lower part of the de-weighting tower A111. The reboiler F116 of the light-light-removal tower is equipped with a No. 2C outlet connected to the input end of the No. 2C reflux line, and the output end of the No. 2C reflux line is connected to the lower part of the light-light-removal tower D114. Both the heavy removal tower A111 and the light removal tower D114 include multiple tower sections, with distillation column tray assembly blocks arranged between adjacent tower sections. The distillation column tray assembly includes a tray 1, triangular blocks 4, fastener screws 5, upper sieve holes 6, and lower sieve holes 8. The tray 1 includes an upper sieve plate 2 and a lower sieve plate 3, which are connected by fastener screws 5. The upper sieve plate 2 is provided with multiple upper sieve holes 6, and the diameter of the upper sieve holes 6 gradually decreases from top to bottom along the upper sieve plate 2. The lower sieve plate 3 is provided with multiple sets of lower sieve holes 8, and the diameter of the lower sieve holes 8 gradually increases from top to bottom along the lower sieve plate 3. The lower sieve plate 3 is provided with multiple triangular blocks 4, and the center lines of the upper sieve holes 6 and the lower sieve holes 8 are arranged alternately. The number of the tower plates 1 is not less than four sets, and the tower plates 1 are stacked in an alternating manner. The two adjacent sets of tower plates 1 are at a 45-degree angle to each other and are fixedly connected by welding. The upper screen plate 2 is fixedly connected to the lower screen plate 3 by welding. The upper screen plate 2 is provided with upper screen hole screw holes 9, and the lower screen plate 3 is provided with lower screen plate screw holes 7. The fastener screws 5 are threadedly connected to a set of lower screen plate screw holes 7 and a set of upper screen hole screw holes 9 respectively.

[0027] In this embodiment, nitrous oxide gas feedstock enters the heavy component removal tower A111 and then flows along the pipeline into the heavy component removal tower condenser B112. Nitrous oxide and other light components are transported to the light component removal tower D114 through outlet A of condenser B112 and the light component pipeline. Heavy components are condensed and enter the heavy component removal tower A111 through outlet B of condenser B112 and the reflux pipeline B112. After entering the heavy component removal tower A111, they flow along the pipeline into the heavy component removal tower reboiler C113. In the heavy component removal tower reboiler C113, they are heated into gas and repeatedly purified by distillation to remove heavy component impurities from the nitrous oxide feedstock, obtaining the primary separation product. The heavy component impurities at the bottom of heavy component removal tower A111 are discharged through the drain outlet. The primary separation product enters the heavy component removal tower D114. Light component impurities in light tower D114 are condensed in light component condenser E115. Impurities with boiling points higher than nitrous oxide are transported to a high-purity storage tank via outlet A and light component pipeline of condenser E115. Crude nitrous oxide is returned to light component condenser D114 via outlet B and reflux pipeline B, where it is heated into a gas in reboiler F116 and repeatedly purified by distillation to obtain liquid nitrous oxide. The liquid in heavy component condenser A111 or light component condenser D114 enters tray 1 through upper sieve holes 6 due to gravity. Several triangular baffles 4 act as buffers, slowing the liquid phase's forward velocity and prolonging the heat and mass exchange time between the liquid and gas phases. Each tray 1 is in contact with water... The trays are installed at a 22.5-degree incline, with an angle of 45 degrees between adjacent trays 1. This design allows the liquid phase to flow downwards under gravity without excessive speed. The incline also maximizes the surface area for liquid flow and the contact area for heat and mass exchange between the rising gas and liquid phases within the same floor space. The triangular baffle 4, narrower at the top and wider at the bottom, slows down the liquid flow without preventing it from flowing down. Following a normal distribution, most of the liquid phase flows to the larger apertures of the lower sieve tray 3 before moving to the next tray 1, preventing waste of residual liquid. The aperture of the upper sieve 6 gradually decreases from top to bottom, which is beneficial for… The liquid phase smoothly and quickly enters the interior of tray 1. The aperture of the lower sieve hole 8 gradually increases from top to bottom, which is beneficial because most of the liquid phase must flow through multiple triangular baffles 4 before entering the next tray 1. This prevents the liquid phase from directly and quickly entering the next tray 1 as soon as it enters the interior of tray 1, greatly extending the heat and mass exchange time. Since the upper sieve hole 6 and the lower sieve hole 8 are arranged in an alternating manner, the contact time between the gas phase and the liquid phase is extended, resulting in better separation effect. At the same time, the number of trays in the distillation column can be increased or decreased according to the properties of different materials, making it suitable for various production needs. The single-tower distillation process can be converted into a double-tower distillation process to improve the purity of nitrous oxide products and ensure the stability of product quality.

[0028] The high-purity nitrous oxide distillation apparatus of this invention uses common mechanical methods for installation, connection, or setup, and can be implemented as long as it achieves the desired beneficial effects. The heavy removal tower A111 and the light removal tower D114 are both distillation towers. The heavy removal tower condenser B112 and the light removal tower condenser E115 of this high-purity nitrous oxide distillation apparatus are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative effort from those skilled in the art.

[0029] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A distillation apparatus for high-purity nitrous oxide, characterized in that, The system includes a heavy removal tower A (111), a heavy removal tower condenser B (112), a heavy removal tower reboiler C (113), a light removal tower D (114), a light removal tower condenser E (115), and a light removal tower reboiler F (116). The top of the heavy removal tower A (111) is connected to the heavy removal tower condenser B (112) via a pipe. The No. A outlet on the heavy removal tower condenser B (112) is connected to the input end of the No. 1 light component pipeline. The No. B outlet on the heavy removal tower condenser B (112) is connected to the input end of the No. 1 B reflux pipeline. The output end of the No. 1 B reflux pipeline is connected to the upper part of the heavy removal tower A (111). The bottom of the heavy removal tower A (111) is connected to the heavy removal tower reboiler C (113) via a pipe. The output end of the No. 1 light component pipeline is connected to the input end of the light removal tower D (114). The top of the light component removal tower D (114) is connected to the light component removal tower condenser E (115) via a pipe. The No. 2 A outlet on the light component removal tower condenser E (115) is connected to the input end of the No. 2 light component pipeline. The No. 2 B outlet on the light component removal tower condenser E (115) is connected to the input end of the No. 2 B reflux pipeline. The output end of the No. 2 B reflux pipeline is connected to the upper part of the light component removal tower D (114). The bottom of the light component removal tower D (114) is connected to the light component removal tower reboiler F (116) via a pipe.

2. The distillation apparatus for high-purity nitrous oxide as described in claim 1, characterized in that, The reboiler C (113) of the de-weight tower is equipped with a No. C outlet connected to the input end of the No. C reflux line, and the output end of the No. C reflux line is connected to the lower part of the de-weight tower A (111).

3. The distillation apparatus for high-purity nitrous oxide as described in claim 1, characterized in that, The reboiler F (116) of the light-light tower is equipped with a No. 2 C outlet connected to the input end of the No. 2 C reflux line, and the output end of the No. 2 C reflux line is connected to the lower part of the light-light tower D (114).

4. The distillation apparatus for high-purity nitrous oxide as described in claim 1, characterized in that, Both the heavy removal tower A (111) and the light removal tower D (114) include multiple tower sections, with distillation tower tray assembly blocks arranged between adjacent tower sections.

5. The distillation apparatus for high-purity nitrous oxide as described in claim 4, characterized in that, The distillation column tray assembly includes a tray (1), triangular blocks (4), fastener screws (5), upper sieve holes (6), and lower sieve holes (8). The tray (1) includes an upper sieve plate (2) and a lower sieve plate (3). The upper sieve plate (2) and the lower sieve plate (3) are connected by fastener screws (5). The upper sieve plate (2) is provided with multiple upper sieve holes (6). The diameter of the upper sieve holes (6) gradually decreases from top to bottom along the upper sieve plate (2). The lower sieve plate (3) is provided with multiple sets of lower sieve holes (8). The diameter of the lower sieve holes (8) gradually increases from top to bottom along the lower sieve plate (3). The lower sieve plate (3) is provided with multiple triangular blocks (4). The center lines of the upper sieve holes (6) and the center lines of the lower sieve holes (8) are arranged alternately.

6. The distillation apparatus for high-purity nitrous oxide as described in claim 5, characterized in that, The number of the trays (1) is not less than four sets and the trays (1) are stacked in an alternating manner. The two adjacent trays (1) are at a 45-degree angle to each other and are fixedly connected by welding. The tray (1) is at a 22.5-degree angle to the horizontal.

7. The distillation apparatus for high-purity nitrous oxide as described in claim 5, characterized in that, The upper sieve plate (2) is fixedly connected to the lower sieve plate (3) by welding. The upper sieve plate (2) is provided with upper sieve hole screw holes (9), and the lower sieve plate (3) is provided with lower sieve plate screw holes (7). Fastener screws (5) are threadedly connected to a set of lower sieve plate screw holes (7) and a set of upper sieve hole screw holes (9) respectively.

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