A carbon monoxide purification device

Abstract

This utility model discloses a carbon monoxide purification device. The purification device achieves the removal of light and heavy substances through multiple distillation columns. At the same time, the medium used for reboiling at the bottom of the columns is used as the cooling medium for condensation at the top of the columns. After condensation at the top of the columns, the medium enters a plate heat exchanger for preheating, and then is compressed by a circulating compressor to raise the temperature. The medium then enters the plate heat exchanger again as a cooling medium. After being cooled to a suitable temperature through heat exchange, it is recycled for reboiling at the bottom of the columns to provide heating, thus realizing heat pump distillation. This achieves purification while reducing energy consumption, thereby reducing costs and increasing efficiency.

Description

Technical Field

[0001] This utility model relates to the field of industrial gas purification technology, specifically a carbon monoxide purification device. Background Technology

[0002] Carbon monoxide, as an important chemical raw material, is widely used in the preparation of ammonia, phosgene, alcohols, acids, esters, aldehydes, anhydrides, ethers, amines, alkanes, and alkenes, as well as various homogeneous reaction catalysts and the extraction of high-purity nickel. However, many industrial applications require carbon monoxide of even higher purity. For example, in the semiconductor and electronics industries, high-purity carbon monoxide electron gas, due to its ability to form low-boiling-point carbonyl complexes with transition metals such as copper, tungsten, molybdenum, and tantalum, is widely used in semiconductor manufacturing processes such as plasma-assisted vapor deposition chamber purging and etching. Furthermore, high-purity carbon monoxide is also widely used in pharmaceutical intermediates, standard gas preparation, carbon monoxide lasers, environmental monitoring, and scientific research. Therefore, the purification of carbon monoxide is of great significance for expanding its industrial, medical, and scientific applications.

[0003] Distillation is a technique that uses the difference in boiling points of different impurities to separate the top and bottom of the column. However, distillation columns usually require condensation at the top and reboiling at the bottom to improve the separation effect, which requires high energy consumption and is not conducive to industrial application.

[0004] In conclusion, it is necessary to design a carbon monoxide purification device that can achieve purification while reducing energy consumption and enhancing competitiveness. Utility Model Content

[0005] The purpose of this invention is to provide a carbon monoxide purification device that achieves purification while reducing energy consumption.

[0006] To achieve the above objectives, the solution of this utility model is as follows: A carbon monoxide purification device includes a first distillation column and a second distillation column; the first distillation column is provided with a first feed pipe, and the bottom of the first distillation column is provided with a second feed pipe connected to the second distillation column; The tops of distillation column 1 and distillation column 2 are respectively equipped with reflux condenser unit 1 and reflux condenser unit 2; reflux condenser unit 2 is connected to a CO collection pipe; the bottoms of distillation column 1 and distillation column 2 are respectively equipped with reboiler reflux unit 1 and reboiler reflux unit 2. The medium discharge ends of the condensing reflux unit one and condensing reflux unit two are connected to one end of refrigerant pipe one, and the other end of refrigerant pipe one is connected to the feed end of the circulating compressor via a plate heat exchanger. The discharge end of the circulating compressor is connected to the medium feed end of the plate heat exchanger. The medium discharge end of the plate heat exchanger is connected to refrigerant pipe two, and refrigerant pipe two is connected to the medium feed ends of reboiling reflux unit one and reboiling reflux unit two, respectively. The medium discharge ends of reboiling reflux unit one and reboiling reflux unit two are connected to one end of refrigerant pipe three, and the other end of refrigerant pipe three is connected to the medium feed ends of condensing reflux unit one and condensing reflux unit two, respectively.

[0007] Furthermore, the discharge end of the circulating compressor is provided with a condenser that is connected to the medium inlet end of the plate heat exchanger.

[0008] Furthermore, the feed pipe is connected to the distillation column via a plate heat exchanger.

[0009] Preferably, the feed pipe is connected to the upper part of the distillation column.

[0010] Furthermore, the second feed pipe is connected to the lower part of the second distillation column.

[0011] Furthermore, the CO extraction pipe is connected to a gas storage tank via a pump.

[0012] Furthermore, a pump is installed on the refrigerant pipe three.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: The carbon monoxide purification device of this invention achieves the removal of light and heavy substances by setting up two distillation columns. At the same time, the medium used for reboiling at the bottom of the column provides cooling energy for the condensation at the top of the column. After condensation at the top of the column, it is compressed by a circulating compressor to raise the temperature and then circulated for heating the reboiling at the bottom of the column after heat exchange. This realizes heat pump distillation, achieving purification effect while reducing energy consumption, thus achieving cost reduction and efficiency improvement. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall carbon monoxide purification device provided by this utility model.

[0015] The attached figures are labeled as follows: C1, Cooler 1; C2, Cooler 2; C3, Cooler 3; CP1, Circulating Compressor; E1, Plate Heat Exchanger; E2, Heat Exchanger 1; E3, Heat Exchanger 2; L1, Feed Pipe 1; L2, Feed Pipe 2; L3, Reflux Pipe 1; L4, Reflux Pipe 2; L5, Reflux Pipe 3; L6, CO Outlet Pipe; L7, Reflux Pipe 4; L8, Refrigerant Pipe 1; L9, Refrigerant Pipe 2; L10, Refrigerant Pipe 3; P1, Pump 1; P2, Pump 2; P3, Pump 3; T1, Distillation Column 1; T2, Distillation Column 2. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0017] It should be understood that the terms "upper", "lower", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0018] It should also be noted that, unless otherwise explicitly specified and limited, terms such as "installation," "connection," "joining," "fixing," and "setting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication between two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0019] In one embodiment, such as Figure 1 As shown, a carbon monoxide purification device is proposed, including a first distillation column T1 and a second distillation column T2; the first distillation column T1 is provided with a first feed pipe L1, and the bottom of the first distillation column T1 is provided with a second feed pipe L2 connected to the second distillation column T2; wherein: The tops of distillation column T1 and distillation column T2 are respectively equipped with reflux unit 1 and reflux unit 2, both used for reflux of light components at the top of the column; reflux unit 2 is connected to CO outlet pipe L6; the bottoms of distillation column T1 and distillation column T2 are respectively equipped with reboil reflux unit 1 and reboil reflux unit 2, both used for reboil reflux of heavy components at the bottom of the column. The condensate outlet of condensing reflux unit one and condensing reflux unit two is connected to one end of refrigerant pipe one L8. The other end of refrigerant pipe one L8 is connected to the feed end of circulating compressor CP1 via plate heat exchanger E1. The discharge end of circulating compressor CP1 is connected to the feed end of plate heat exchanger E1. The feed end of plate heat exchanger E1 is connected to refrigerant pipe two L9. Refrigerant pipe two L9 is connected to the feed ends of reboiling reflux unit one and reboiling reflux unit two, respectively. The feed ends of reboiling reflux unit one and reboiling reflux unit two are connected to one end of refrigerant pipe three L10, respectively. The other end of refrigerant pipe three L10 is connected to the feed ends of condensing reflux unit one and condensing reflux unit two, respectively.

[0020] In the above embodiments, the carbon monoxide purification device achieves the removal of light substances through distillation column one and the removal of heavy substances through distillation column two. At the same time, the medium used for reboiling at the bottom of the column is used as the cooling medium for condensation at the top of the column. After condensation at the top of the column, it enters a plate heat exchanger for preheating, and then is compressed by a circulating compressor to raise the temperature. It then enters the plate heat exchanger again as a cooling medium. After being cooled to a suitable temperature through heat exchange, it is recycled for reboiling at the bottom of the column to provide heating, thus realizing heat pump distillation. This achieves purification while reducing energy consumption, thereby reducing costs and increasing efficiency.

[0021] In the above embodiments, the first reflux condenser unit includes a second condenser C2 and a first reflux pipe L3 that runs through the second condenser C2. The beginning and end of the first reflux pipe L3 are respectively connected to the top and upper part of the distillation column T1 for light component reflux. The second reflux condenser unit includes a third condenser C3 and a third reflux pipe L5 that runs through the third condenser C3. The beginning and end of the third reflux pipe L5 are respectively connected to the top and upper part of the distillation column T2 for light component reflux. The light component reflux is used to improve the separation degree, thereby increasing the purity of the extracted carbon monoxide. The third reflux pipe L5 is connected to the CO extraction pipe L6 near its tail end for extracting high-purity carbon monoxide. The first reboiler reflux unit includes a heat exchanger E2 and a second reflux pipe L4 running through the heat exchanger E2. The beginning and end of the second reflux pipe L4 correspond to different heights at the bottom of the distillation column T1, respectively, for the reboiler reflux of heavy components. The second reboiler reflux unit includes a heat exchanger E3 and a fourth reflux pipe L7 running through the heat exchanger E3. The beginning and end of the fourth reflux pipe L7 correspond to different heights at the bottom of the distillation column T2, respectively, for the reboiler reflux of heavy components. The reboiled heavy components are also used to improve the separation degree of substances with different boiling points.

[0022] In one operating condition, taking the feed gas from the cryogenic cold box of the upstream process as an example, the composition is: CO 75%, N2 24%, Ar 1%, H2 0.1 ppm, CH4 0.8 ppm, C2H6 1 ppm, and C3H8 15 ppm. The preferred circulating medium for this purification unit is nitrogen. Heat exchange is achieved through the interconversion of nitrogen from liquid to gaseous states, and the temperatures at the top and bottom of the distillation column are controlled to first separate light components such as H2, followed by the separation of other heavy components. By controlling parameters such as temperature and reflux ratio, the above process can achieve a CO purity of ≥99.999%, meeting electronic grade requirements.

[0023] In a preferred embodiment, to control the initial temperature of the circulating medium, the discharge end of the circulating compressor CP1 is connected to the medium inlet end of the plate heat exchanger E1 via a condenser C1. Inside the plate heat exchanger E1, the medium entering the circulating compressor CP1 exchanges heat with the produced medium, thus fully utilizing the system's own heat or cooling capacity.

[0024] In a preferred embodiment, the feed pipe L1 is connected to the distillation column T1 via a plate heat exchanger E1, where heat exchange occurs with the medium to increase the feed temperature.

[0025] It is understood that the plate heat exchanger E1 can further select and utilize external media or materials to precisely control heat exchange, so that the temperature control of the circulating medium after heat exchange through the plate heat exchanger E1 is more precise, thereby ensuring the stable progress of distillation and purification.

[0026] In a preferred embodiment, the feed pipe L1 is connected to the upper part of the distillation column T1, and the upper feed can reduce the residence time of light components in the column. The feed pipe L2 is connected to the lower part of the distillation column T2 to reduce the residence time of heavy components in the column and improve the purification effect.

[0027] In a preferred embodiment, the CO extraction pipe L6 is connected to a gas storage tank via pump one (P1); pump two (P2) is provided on the refrigerant pipe three (L10), and pump three (P3) is connected to the tail of the return pipe four (L7) for extracting heavy components.

[0028] It is understandable that the materials of each unit in the above purification device can be selected according to the physicochemical properties of the raw materials, and commonly used instruments, meters or valves can be selected or added according to the operation requirements. All of the above are within the design scope of this solution and will not be elaborated here.

[0029] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that variations, modifications, substitutions and alterations may be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carbon monoxide purification device, characterized in that, It includes distillation column one (T1) and distillation column two (T2); distillation column one (T1) is provided with feed pipe one (L1), and the bottom of distillation column one (T1) is provided with feed pipe two (L2) connected to distillation column two (T2); The top of distillation column 1 (T1) and distillation column 2 (T2) are respectively equipped with reflux unit 1 and reflux unit 2; reflux unit 2 is connected to CO outlet pipe (L6); the bottom of distillation column 1 (T1) and distillation column 2 (T2) are respectively equipped with reboil reflux unit 1 and reboil reflux unit 2. The medium discharge ends of the condensing reflux unit one and condensing reflux unit two are connected to one end of refrigerant pipe one (L8), and the other end of refrigerant pipe one (L8) is connected to the feed end of the circulating compressor (CP1) via a plate heat exchanger (E1). The discharge end of the circulating compressor (CP1) is connected to the medium feed end of the plate heat exchanger (E1). The medium discharge end of the plate heat exchanger (E1) is connected to refrigerant pipe two (L9), and refrigerant pipe two (L9) is connected to the medium feed ends of reboiling reflux unit one and reboiling reflux unit two, respectively. The medium discharge ends of reboiling reflux unit one and reboiling reflux unit two are connected to one end of refrigerant pipe three (L10), and the other end of refrigerant pipe three (L10) is connected to the medium feed ends of condensing reflux unit one and condensing reflux unit two, respectively.

2. The purification apparatus according to claim 1, characterized in that, The discharge end of the circulating compressor (CP1) is connected to the medium inlet end of the condenser (C1) and the plate heat exchanger (E1).

3. The purification apparatus according to claim 1, characterized in that, The feed pipe (L1) is connected to the distillation column (T1) via a plate heat exchanger (E1).

4. The purification apparatus according to claim 1 or 3, characterized in that, The feed pipe (L1) is connected to the upper part of the distillation column (T1).

5. The purification apparatus according to claim 1, characterized in that, The feed pipe 2 (L2) is connected to the lower part of the distillation column 2 (T2).

6. The purification apparatus according to claim 1, characterized in that, The CO extraction pipe (L6) is connected to the gas storage tank via pump one (P1).

7. The purification apparatus according to claim 1, characterized in that, Pump 2 (P2) is installed on the refrigerant pipe 3 (L10).

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