Reflux device of DMO synthetic gas removal tower

Abstract

The utility model provides a reflux device of a DMO synthesis gas removal tower, and belongs to the field of DMO synthesis. Comprising a gas removal tower, a gas inlet pipeline is arranged on the gas removal tower, the top of the gas removal tower is communicated with a gas phase pipeline, the bottom of the gas removal tower is connected with a tower kettle pipeline, a first reflux pump and a second reflux pump are arranged on the tower kettle pipeline in parallel, and the first reflux pump and the second reflux pump are connected into a reflux pipeline. The reflux pipeline is arranged in the middle of the gas removal tower, and a tower top introduction pipeline is arranged at the top of the gas removal tower. By arranging the reflux pump, part of crude DMO is extracted from the bottom and flows back to the middle part of the tower, and the crude DMO in the rising gas phase is flushed in advance, so that the content of DMO in the gas phase is effectively reduced, the supplement of fresh methanol is reduced, the removal of effective components such as MN, NO and the like in the gas phase is improved, and the waste of a nitrogen source is reduced.

Description

Technical Field

[0001] This utility model belongs to the field of DMO synthesis, specifically relating to a DMO synthesis gas removal tower reflux device. Background Technology

[0002] The crude DMO product from the DMO (dimethyl oxalate) synthesis reactor inevitably contains a series of impurities, mainly including methanol, nitric oxide (NO), carbon monoxide (CO), trace amounts of metallic manganese (MN), and nitrogen gas. These mixed gases are introduced together with the crude DMO into a DMO gas removal tower for subsequent separation and purification steps.

[0003] Inside the DMO gas removal column, as the pressure gradually decreases, the lighter components in the crude DMO—mainly composed of methanol, NO, CO, MN, and nitrogen—begin to rise and accumulate in the top region of the column due to their relatively low boiling points and volatility, eventually exiting the system through the top outlet. Meanwhile, the heavier DMO components, with their higher boiling points, remain in the bottom of the column, ready for further purification or collection.

[0004] However, it is worth noting that during the ascent of the lighter components, a considerable portion of the DMO components, due to similar physical properties or operating conditions, also rises to the top of the column along with the lighter components. This undoubtedly reduces the DMO recovery efficiency and product quality. To effectively address this issue, a common strategy is to introduce fresh methanol from the top of the column. This fresh methanol flows downwards through the column, countercurrently flushing the rising crude DMO. This helps to carry the entrained DMO components back to the bottom of the column, thereby improving the DMO recovery rate.

[0005] Because the operating temperature of the DMO gas removal tower is relatively high, a large amount of fresh methanol must be continuously supplied from the outside to maintain the necessary flushing effect and tower conditions. This process not only increases methanol consumption but also leads to significant energy waste, as methanol production, storage, and transportation all require energy resources. Therefore, how to reduce methanol consumption and energy waste while ensuring efficient DMO recovery has become an important issue for current process optimization and energy conservation and emission reduction. Utility Model Content

[0006] The purpose of this invention is to overcome the problems of existing DMO gas removal towers having high temperatures, requiring a large amount of fresh methanol to be added, and having poor gas removal efficiency. It provides a DMO synthesis gas removal tower reflux device, which washes the DMO in the gas phase in advance by refluxing the coarse DMO in the tower bottom pipeline to the middle of the tower, thereby reducing the DMO content in the rising gas phase, improving the separation efficiency, and reducing the consumption of fresh methanol.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A DMO synthesis gas removal tower reflux device includes a gas removal tower, an inlet pipe on the gas removal tower, a gas phase pipe connected to the top of the gas removal tower, a reboiler pipe connected to the bottom of the gas removal tower, a first reflux pump and a second reflux pump arranged in parallel on the reboiler pipe, the first reflux pump and the second reflux pump connected to the reflux pipe, the reflux pipe being located in the middle of the gas removal tower, and a top inlet pipe provided at the top of the gas removal tower.

[0009] The intake pipe is equipped with a first valve, which controls the flow of DMO synthesis gas.

[0010] The tower bottom pipeline is used to discharge the crude DMO that has undergone the removal process.

[0011] A second valve is installed on the tower bottom pipeline to control the flow rate of crude DMO.

[0012] The first reflux pump and the second reflux pump extract crude DMO from the bottom pipeline of the tower and pressurize the crude DMO.

[0013] The pressurized crude DMO flows into the middle of the gas removal tower through the reflux pipe to flush the DMO in the rising gas phase inside the gas removal tower.

[0014] The first and second reflux pumps can adjust the reflux flow rate according to actual needs. Only one reflux pump is used during the reflux process, with the other as a backup.

[0015] The gas phase pipeline is used to discharge the gas phase after it has been removed and flushed.

[0016] The top inlet pipe is used to introduce fresh methanol.

[0017] The gas removal tower is equipped with a structured packing layer.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] This invention proposes a reflux device for a DMO synthesis gas removal tower, comprising a gas removal tower with an inlet pipe, a gas phase pipe connected to the top of the tower, and a reboiler pipe connected to the bottom of the tower. A first reflux pump and a second reflux pump are parallel to each other on the reboiler pipe and connected to the reflux pipe, which is located in the middle of the gas removal tower. A top inlet pipe is located at the top of the gas removal tower. By using reflux pumps, a portion of crude DMO is drawn from the bottom and refluxed to the middle of the tower, pre-washing the crude DMO in the rising gas phase. This effectively reduces the DMO content in the gas phase, reduces the need for fresh methanol replenishment, improves the removal of effective components such as MN and NO from the gas phase, and reduces nitrogen source waste.

[0020] Furthermore, a second valve is installed on the tower bottom pipeline. By adjusting the opening of the second valve, the discharge rate and flow rate of crude DMO can be controlled to adapt to different production needs.

[0021] Furthermore, the operation of the first and second reflux pumps, one in operation and one on standby, can improve operational stability.

[0022] Furthermore, the gas removal tower is equipped with a structured packing layer to increase the gas-liquid contact area and improve mass transfer efficiency. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0024] Figure 1 This is a structural diagram of the device of this utility model;

[0025] The following are the annotations in the diagram: 1. Inlet pipe; 11. First valve; 2. Gas removal tower; 3. Tower bottom pipe; 31. Second valve; 4. Reflux pipe; 41. First reflux pump; 42. Second reflux pump; 6. Tower top inlet pipe; 61. Third valve; 7. Gas phase pipe. Detailed Implementation

[0026] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.

[0027] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., 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, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0029] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the present invention. As used in this specification and the appended claims, unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “the” are intended to include the plural forms, and the term “and / or” refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0030] The accompanying drawings show various structural schematic diagrams according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged and may have been omitted for clarity. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0031] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0032] like Figure 1As shown, a DMO synthesis gas removal tower reflux device includes a gas removal tower 2, an inlet pipe 1 on the gas removal tower 2, a first valve 11 on the inlet pipe 1, a gas phase pipe 7 connected to the top of the gas removal tower 2, a reboiler pipe 3 connected to the bottom of the gas removal tower 2, a first reflux pump 41 and a second reflux pump 42 arranged in parallel on the reboiler pipe 3, the first reflux pump 41 and the second reflux pump 42 connected to the reflux pipe 4, the reflux pipe 4 being located in the middle of the gas removal tower 2, and a tower top inlet pipe 6 on the top of the gas removal tower 2.

[0033] Preferably, the gas removal tower 2 is made of corrosion-resistant and high-temperature-resistant materials, and has a structured packing layer inside to increase the gas-liquid contact area and improve mass transfer efficiency. The tower body is designed to be vertical to facilitate the smooth flow of the gas and liquid phases.

[0034] Preferably, a first valve 11 is installed on the air inlet pipe 1. By precisely controlling the opening of the first valve 11, the gas flow rate entering the tower can be adjusted to ensure the stability and safety of the operation process.

[0035] Preferably, a second valve 31 is provided on the tower bottom pipeline 3. By adjusting the opening degree of the second valve 31, the discharge rate and flow rate of crude DMO can be controlled to adapt to different production needs.

[0036] Preferably, the first reflux pump 41 and the second reflux pump 42 extract crude DMO from the bottom pipe 3 of the tower and pressurize it before sending it into the reflux pipe 4. The reflux pipe 4 is located in the middle of the gas removal tower 2, so that the pressurized crude DMO can be evenly sprayed into the tower to flush and recover DMO in the rising gas phase; the first reflux pump 41 and the second reflux pump 42 are operated in a standby configuration, which can improve the stability of operation.

[0037] Preferably, the gas phase pipeline 7 is used to discharge the gas phase after removal and flushing treatment. The design of the gas phase pipeline 7 should ensure that the gas phase can be discharged smoothly and avoid blockage and leakage.

[0038] Preferably, the top inlet pipe 6 is used to introduce fresh methanol, and a third valve 61 is installed on the top inlet pipe 6 to control the rate at which fresh methanol is introduced. The introduction of fresh methanol helps to regulate the temperature and pressure inside the tower and improve the removal efficiency.

[0039] A reflux device for a DMO synthesis gas removal tower is used as follows:

[0040] First, open the first valve 11 on the inlet pipe 1 to introduce DMO synthesis gas into the gas removal tower 2. At the same time, start the first reflux pump 41 or the second reflux pump 42 to extract crude DMO from the tower bottom pipe 3 for pressurization and spray it evenly into the tower through the reflux pipe 4.

[0041] Based on production needs, the gas flow rate entering the tower and the emission rate of crude DMO are controlled by adjusting the opening of the first valve 11 and the second valve 31. Simultaneously, the speed and reflux flow rate of the reflux pump are adjusted in a timely manner according to changes in pressure and temperature within the tower.

[0042] Fresh methanol is introduced into the tower through pipe 6 at the top of the tower as needed to adjust the reaction environment inside the tower and improve the removal efficiency.

[0043] After removal and rinsing, the gas phase is discharged through the gas phase pipeline, while the crude DMO is collected through the bottom pipeline 3 and sent to the subsequent processing steps.

[0044] After production is completed, shut off intake pipe 1 and return pump, and clean and maintain the equipment to ensure long-term stable operation.

[0045] Finally, it should be noted that the above embodiments only describe the basic principles, main features, and advantages of this utility model. For those skilled in the art, it is obvious that this utility model is not limited to the details of the above exemplary embodiments, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.

Claims

1. A reflux device for a DMO synthesis gas removal tower, characterized in that, The gas removal tower (2) is provided with an inlet pipe (1), the top of the gas removal tower (2) is connected to a gas phase pipe (7), the bottom of the gas removal tower (2) is connected to a bottom pipe (3), a first reflux pump (41) and a second reflux pump (42) are arranged in parallel on the bottom pipe (3), the first reflux pump (41) and the second reflux pump (42) are connected to a reflux pipe (4), the reflux pipe (4) is located in the middle of the gas removal tower (2), and a top inlet pipe (6) is provided at the top of the gas removal tower (2).

2. The DMO synthesis gas removal tower reflux device according to claim 1, characterized in that, The air intake pipe (1) is equipped with a first valve (11), through which the introduction of DMO synthesis gas is controlled.

3. The DMO synthesis gas removal tower reflux device according to claim 1, characterized in that, The tower bottom pipe (3) is used to discharge the crude DMO after the removal treatment.

4. The DMO synthesis gas removal tower reflux device according to claim 3, characterized in that, A second valve (31) is installed on the tower bottom pipeline (3) to control the flow rate of crude DMO.

5. A DMO synthesis gas removal tower reflux device according to claim 3, characterized in that, The first reflux pump (41) and the second reflux pump (42) extract crude DMO from the bottom pipeline (3) and pressurize the crude DMO to obtain pressurized crude DMO.

6. The DMO synthesis gas removal tower reflux device according to claim 5, characterized in that, The pressurized crude DMO flows into the middle of the gas removal tower (2) through the reflux pipe (4) to flush the DMO in the rising gas phase inside the gas removal tower (2).

7. A DMO synthesis gas removal tower reflux device according to claim 6, characterized in that, The first reflux pump (41) and the second reflux pump (42) can adjust the reflux flow rate according to actual needs. Only one reflux pump is used during the reflux process, and the other is used as a backup.

8. A DMO synthesis gas removal tower reflux device according to claim 6, characterized in that, The gas phase pipeline (7) is used to discharge the gas phase after it has been removed and flushed.

9. A DMO synthesis gas removal tower reflux device according to claim 1, characterized in that, The top inlet pipe (6) is used to introduce fresh methanol, and a third valve (61) is installed on the top inlet pipe (6).

10. A DMO synthesis gas removal tower reflux device according to claim 1, characterized in that, The gas removal tower (2) is equipped with a structured packing layer inside.

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