Impurity removal type gas-liquid flow divider for propylene carbonate production and processing

Abstract

The invention discloses an impurity removal type gas-liquid diverter for propylene carbonate production and processing, which aims at hydraulic pressure generated in the injection process of propylene carbonate mixed liquid, is matched with a spiral sheet group to adaptively rotate under the action of the hydraulic pressure, and has the key purpose of prolonging the flow distance of the propylene carbonate mixed liquid and improving the production efficiency of the propylene carbonate mixed liquid. The heating template provides a heat source in the flowing process of the propylene carbonate mixed liquid to ensure that gas dissolved in the propylene carbonate mixed liquid is separated out, and in the process, on one hand, the separated-out gas is transferred into the gas-liquid separation pipe through the combination of the fall pipe and the liquid level balance principle; and the hydraulic pressure during injection of the propylene carbonate mixed liquid is further utilized, and the key purpose is that the separated gas is ensured to be discharged in an independent liquid manner by utilizing the difference value between the gas pressure generated by the gas and the hydraulic pressure of the propylene carbonate mixed liquid.

Description

Technical Field

[0001] The invention relates to the technical field of propylene carbonate production, and in particular to an impurity-removing gas-liquid splitter for the production and processing of propylene carbonate. Background Art

[0002] Propylene carbonate is synthesized from propylene oxide, carbon dioxide, a catalyst and other ingredients. The synthetic product includes propylene carbonate and various by-products. It is necessary to obtain propylene carbonate with higher purity through a purification process. Please refer to the relevant content in the publication number CN215049789U.

[0003] Before the purification process, it is necessary to further discharge the gas therein, and its essence is mainly based on a gas-liquid splitter. Please refer to the relevant content in the publication number CN220609559U. However, during the synthesis preparation process, part of the gas is dissolved in the synthetic product. In the subsequent purification (distillation) process, the gas in the synthetic product is precipitated when heated, which will also indirectly affect the purity of propylene carbonate. The conventional gas-liquid splitter specifically uses the centrifugal force generated when the medium circulates to separate the gas, but it is difficult to fully precipitate the gas dissolved in the liquid. This application proposes a solution. Summary of the invention

[0004] The object of the present invention is to provide a gas-liquid splitter for removing impurities in the production and processing of propylene carbonate. Since some gas will be dissolved in the synthetic product of propylene carbonate, it is difficult for a conventional gas-liquid splitter to fully remove the dissolved gas by relying solely on centrifugal force, which directly affects the subsequent purification process, specifically affecting the purification purity of propylene carbonate.

[0005] The object of the present invention can be achieved by the following technical scheme: A de-impurity gas-liquid flow divider for the production and processing of propylene carbonate, comprising a shell and a heating assembly, a gas-liquid separation pipe arranged vertically is installed at the center point of the upper surface of the shell, and a water outlet and a water supply port are respectively opened at the outer edge and the center point of the lower surface of the shell;

[0006] A spiral sheet group is arranged inside the shell, the heating component is installed at the lower side of the shell corresponding to the spiral sheet group, a cooperative component is arranged in the gas-liquid separation pipe, and a plurality of drop pipes are installed on the upper surface of the shell;

[0007] The cooperative assembly includes a piston block, a separator block, a vortex fan group and a filter cover arranged from top to bottom. A movable conduit is fixedly installed between the vortex fan group and the filter cover. A movable guide rod is slidably installed in the movable conduit. The movable guide rod is fixedly connected and slidably connected to the piston block and the separator block.

[0008] It is further configured that: the spiral sheet group is rotationally connected inside the shell, and the movable conduit and the spiral sheet group are slidingly connected.

[0009] It is further configured as follows: the drop pipe is composed of a plurality of vertically arranged empty pipes, the height of each empty pipe increases along the direction from the center point of the shell to the water outlet, and a gas-liquid transposition pipe is installed between the empty pipe close to the water outlet and the gas-liquid separation pipe.

[0010] It is further configured as follows: an air outlet is provided on the gas-liquid separation tube, the intersection of the gas-liquid transposition tube and the gas-liquid separation tube and the opening position of the air outlet are located in the middle position of the piston block and the separation block, and the piston block, the separation block and the inner wall of the gas-liquid separation tube are respectively slidably connected and fixedly connected.

[0011] It is further configured as follows: a pressure cone cap is installed on the lower side of the movable guide rod corresponding to the partition block, and a through opening is opened on the outer wall of the movable guide rod corresponding to the movable guide rod, and the lower end of the movable guide rod is connected to the lower side of the filter cover.

[0012] It is further configured as follows: an airbag action component is installed on the upper end of the gas-liquid separation tube, and the action position of the airbag action component is fixedly connected to the movable guide rod.

[0013] It is further configured as follows: a plurality of liquid guiding columns are installed on the lower side of the piston block, and the liquid guiding columns penetrate downward to the lower position of the separation block.

[0014] It is further configured as follows: a liquid conducting groove corresponding to the liquid conducting column is opened in the separation block, the diameter of the liquid conducting groove is larger than the outer diameter of the liquid conducting column, and the liquid conducting column corresponds to the blocking ball of the separation block.

[0015] The present invention has the following beneficial effects:

[0016] 1. In view of the gas that may be dissolved in the process of preparing propylene carbonate, the present invention is based on a spiral sheet group and combined with the liquid pressure generated when the propylene carbonate mixed liquid is injected. The spiral sheet group is used to "extend" the flow distance of the propylene carbonate mixed liquid inside the shell, and the heating module is used to provide heat energy to ensure that the gas dissolved in the propylene carbonate mixed liquid is precipitated. On this basis, the heating temperature of the heating template is further limited to avoid affecting the propylene carbonate component while ensuring the gas precipitation.

[0017] 2. Based on the above contents, during the flow of the propylene carbonate mixed liquid, the mixture of precipitated gas and liquid is first transferred to the gas-liquid separation tube through the drop pipe. During this process, the piston block and the separation block are directional moved by the difference between the air pressure and the hydraulic pressure. On the one hand, it is to ensure that the precipitated gas is normally discharged from the gas outlet, and on the other hand, it is to ensure that part of the liquid that has penetrated into the gas-liquid separation tube returns to the shell. During the overall process, the propylene carbonate mixed liquid flows freely in the spiral sheet group in a normal manner, and the gas precipitation is ensured during the flow process, so that the propylene carbonate mixed liquid after the gas is separated flows out from the water outlet, and a filter cover for filtering impurities is added simultaneously, as well as a vortex fan group in the flow process of the propylene carbonate mixed liquid, the purpose of which is to ensure that the propylene carbonate mixed liquid flows in a circular form. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is a schematic structural diagram of a gas-liquid flow divider for removing impurities in the production and processing of propylene carbonate proposed by the present invention;

[0020] Figure 2 The present invention provides a kind of impurity-removing gas-liquid splitter for producing and processing propylene carbonate Figure 1 sectional view of

[0021] Figure 3 A top view of a shell of a gas-liquid flow divider for removing impurities in the production and processing of propylene carbonate proposed by the present invention;

[0022] Figure 4 The present invention provides a kind of impurity-removing gas-liquid splitter for producing and processing propylene carbonate Figure 2 A partial cutaway view of

[0023] Figure 5 This is a schematic structural diagram of a cooperative component in a gas-liquid flow divider for removing impurities in the production and processing of propylene carbonate proposed by the present invention;

[0024] Figure 6 The present invention provides a kind of impurity-removing gas-liquid splitter for producing and processing propylene carbonate Figure 4 A front view of

[0025] Figure 7 The present invention provides a kind of impurity-removing gas-liquid splitter for producing and processing propylene carbonate Figure 5 sectional view of .

[0026] In the figure: 1. Shell; 101. Water outlet; 102. Water supply port; 103. Air outlet; 2. Heating assembly; 3. Airbag actuation assembly; 4. Gas-liquid separation tube; 5. Drop pipe; 6. Gas-liquid transposition tube; 7. Spiral sheet group; 8. Piston block; 9. Movable guide rod; 10. Filter cover; 11. Vortex fan group; 12. Movable guide tube; 13. Pressure cone cap; 14. Separation block; 15. Liquid guide column. DETAILED DESCRIPTION

[0027] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than 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.

[0028] Embodiment 1: In view of the problem that some gas will be dissolved in the synthetic product of propylene carbonate, it is difficult for the conventional gas-liquid splitter to fully remove the dissolved gas by relying solely on centrifugal force, which directly affects the subsequent purification process, specifically affecting the purification purity of propylene carbonate. The following solution is provided:

[0029] Reference Figures 1 to 7 In this embodiment, a gas-liquid flow divider for removing impurities in the production and processing of propylene carbonate includes a shell 1 and a heating assembly 2. A gas-liquid separation pipe 4 is vertically installed at the center point of the upper surface of the shell 1, and a water outlet 101 and a water supply port 102 are respectively opened at the outer edge and the center point of the lower surface of the shell 1;

[0030] A spiral sheet group 7 is arranged inside the shell 1, the heating component 2 is installed at the lower side of the shell 1 corresponding to the spiral sheet group 7, a cooperative component is arranged in the gas-liquid separation pipe 4, and a plurality of drop pipes 5 are installed on the upper surface of the shell 1;

[0031] The cooperative assembly includes a piston block 8, a partition block 14, a vortex fan group 11 and a filter cover 10 arranged from top to bottom. A movable conduit 12 is fixedly installed between the vortex fan group 11 and the filter cover 10. A movable guide rod 9 is slidably installed in the movable conduit 12. The movable guide rod 9 is fixedly connected and slidably connected to the piston block 8 and the partition block 14.

[0032] Basic principle: The conventional synthesis method of propylene carbonate is to react carbon dioxide with propylene oxide to generate propylene carbonate under the conditions of 150-160°C and 5MPa, and then obtain the finished product by vacuum distillation. The product obtained in the specific reaction process is a mixed liquid, and part of the gas is dissolved in the mixed liquid during the specific preparation process. In order to avoid affecting the subsequent distillation process, the gas must be removed first. The method proposed in the present invention is mainly based on the heating method. It should be noted that:

[0033] Propylene carbonate is a colorless, transparent liquid with an alcohol-like odor, but with low volatility. Its volatility is affected by many factors, such as ambient temperature, atmospheric pressure, and container materials. At normal room temperature and pressure, propylene carbonate is not easy to volatilize and can be kept in the container for a long time. Specifically, it starts to volatilize at 140 degrees Celsius.

[0034] The key content of the present invention is: the heating component 2 provides a temperature below 100 degrees Celsius, specifically to ensure that the water in the propylene carbonate liquid boils, but does not affect the propylene carbonate component inside it, and the gas inside the propylene carbonate mixed liquid is heated and volatilized and precipitated in the heating environment. This part is the key content of the present invention;

[0035] Reference Figure 2 and Figure 3 It should be noted that the propylene carbonate mixed liquid is injected into the shell 1 from the water inlet 102, the propylene carbonate mixed liquid is first filled into the gas-liquid separation tube 4, and the propylene carbonate mixed liquid gradually flows to the outside along the structural shape of the spiral sheet group 7 until it is discharged from the water outlet 101. During the continuous flow of the propylene carbonate mixed liquid, it is subjected to the temperature of the heating component 2, and the overall heating distance is "extended" to ensure that the dissolved gas is fully precipitated.

[0036] Example 2: Supplementary explanation of the flow process of the propylene carbonate mixed liquid inside the shell:

[0037] The spiral plate group 7 is rotatably connected inside the shell 1, and the movable conduit 12 and the spiral plate group 7 are slidably connected. The drop pipe 5 is composed of a plurality of vertically arranged empty tubes, and the height of each empty tube increases along the direction from the center point of the shell 1 to the water outlet 101, and a gas-liquid transposition tube 6 is installed between the empty tube close to the water outlet 101 and the gas-liquid separation tube 4, and an air outlet 103 is opened on the gas-liquid separation tube 4. The intersection of the gas-liquid transposition tube 6 and the gas-liquid separation tube 4 and the opening position of the air outlet 103 are located in the middle position of the piston block 8 and the separation block 14. The piston block 8, the separation block 14 and the inner wall of the gas-liquid separation tube 4 are respectively slidably connected and fixedly connected.

[0038] Program Description: Figure 6 Combined with Figure 4In the figure, the propylene carbonate mixed liquid first passes through the filter cover 10, which is mainly used to preliminarily filter the impurities that may exist in the propylene carbonate mixed liquid. Then, the propylene carbonate mixed liquid continues to pass through the vortex fan group 11. Under the action of the vortex fan group 11, the propylene carbonate mixed liquid is mainly driven to circulate. When the propylene carbonate mixed liquid flows in the spiral sheet group 7, the spiral sheet group 7 is also driven to rotate slightly.

[0039] However, the key content lies in the drop pipe 5. During the continuous flow of the propylene carbonate mixed liquid, part of the liquid will also fill up the drop pipe 5. However, due to the problem of gas precipitation in the whole process, the precipitated gas is concentrated at the uppermost position of the drop pipe 5. Figure 6 For example, when there is more gas inside the empty tube closest to the gas-liquid separation tube 4, part of the liquid will be squeezed back into the shell, and the same logic is continued. Finally, the precipitated gas is mainly concentrated in the upper position inside the empty tube far away from the gas-liquid separation tube 4, so that the precipitated gas is transferred to the gas-liquid separation tube 4 through the gas-liquid transfer tube 6, specifically concentrated in the middle position between the piston block 8 and the separation block 14, and discharged from the gas outlet 103, realizing the independent discharge process of the two media of gas and liquid.

[0040] Embodiment 3: In combination with Embodiment 1 and Embodiment 2, the gas-liquid separation tube is further explained:

[0041] A pressure cone cap 13 is installed on the lower side of the movable guide rod 13 corresponding to the dividing block 14, and a through opening is opened on the outer wall position of the movable guide rod 9 corresponding to the movable guide tube 12. The lower end position of the movable guide tube 12 is connected to the lower side position of the filter cover 10, and the airbag action component 3 is installed on the upper end position of the gas-liquid separation tube 4. The action position of the airbag action component 3 is fixedly connected to the movable guide rod 9. A plurality of liquid guiding columns 15 are installed on the lower side of the piston block 8. The liquid guiding columns 15 penetrate downward to the lower position of the dividing block 14. A liquid guiding groove corresponding to the liquid guiding column 15 is opened in the dividing block 14. The diameter of the liquid guiding groove is larger than the outer diameter of the liquid guiding column 15. The liquid guiding column 15 corresponds to the blocking ball of the dividing block 14.

[0042] Firstly, based on the technical contents in the second embodiment, when the gas enters the gas-liquid separation tube 4, some liquid will also penetrate into the gas-liquid separation tube 4 through the gas, thereby causing some liquid to exist in the area between the separation block 14 and the piston block 4. For this purpose, the following technical contents need to be set:

[0043] S1: In the initial state, the piston block 8 moves downward through the action of the airbag action assembly 3. The essence of the airbag action assembly is a combination of an airbag and a pressure sensor, and the movable guide rod 9 is slidably connected to the gas-liquid separation tube 4. The essence of the connection between the movable guide rod 9 and the action position of the airbag action group is that the airbag is inflated and deformed, thereby generating downward pressure on the movable guide rod 9, which drives the movable guide rod 9 to move downward, ensuring that each liquid guide column 15 moves downward with the blocking ball and is inserted into the liquid guide groove;

[0044] In this process, the blocking ball completely blocks the liquid guide groove, so that the liquid that may penetrate into the gas-liquid separation tube 4 is still retained inside it. This is for the purpose of maintaining the sealing of the area between the separation block 14 and the piston block 4. Therefore, it can be understood that: the gas outlet 103 can be opened and closed by a solenoid valve or other structure, and the pressure of the area between the separation block 14 and the piston block 4 needs to be detected. When the internal pressure environment reaches a certain value, part of the gas is discharged by opening the solenoid valve or other structure;

[0045] S2: On the basis of blocking the gas outlet 103, the piston block 8 can be driven to move upward to make the blocking ball on the liquid guide column 15 disengage from the liquid guide groove, so as to ensure that part of the liquid returns to the housing 1. However, it should be further explained that when the propylene carbonate mixed liquid is injected into the housing 1, part of the gas will naturally precipitate, and the propylene carbonate mixed liquid will continue to rise in the gas-liquid separation tube 4.

[0046] In this process, firstly, an upward pressure can be generated on the pressure cone cap 13, driving the overall movable guide rod 9 to move upward. However, it is essentially necessary to ensure that the liquid guide column 15 on the piston block 8 completely blocks the partition block 14. Therefore, the combined pressure environment of the liquid pressure and gas pressure inside the shell 1 mainly acts on the airbag action component 3, and the pressure of the airbag is detected by the pressure sensor, so that the pressure environment of the area between the piston block 8 and the partition block 14 relative to the inside of the shell 1 can be fed back. After the value detected by the pressure sensor reaches a certain value, the gas in the area between the piston block 8 and the partition block 14 is discharged;

[0047] S3: The injection process of the propylene carbonate mixed liquid is described. Although the lower end of the movable conduit 12 is connected to the filter cover 10, the movable conduit 12 is blocked by the movable guide rod 9 in the initial state, so that the propylene carbonate mixed liquid can only be filtered through the filter cover 10. However, when there are more impurities adsorbed on the filter cover 10, the propylene carbonate mixed liquid can only enter the movable conduit 12 and generate an upward thrust on the movable guide rod 9, thereby further affecting the pressure environment of the airbag in the airbag action component. In addition, the opening on the movable conduit 12 can be opened by driving the movable guide rod 9 to move upward, and the filter cover 10 inside the housing 1 can be replaced with this as a reference condition.

[0048] In summary: in response to the liquid pressure generated during the injection of the propylene carbonate mixed liquid, the spiral sheet group is adaptively rotated under the action of the liquid pressure. The key purpose is to "extend" the flow distance of the propylene carbonate mixed liquid, and to provide a heat source with a heating template during the flow of the propylene carbonate mixed liquid to ensure the precipitation of the gas dissolved in the propylene carbonate mixed liquid. In this process, on the one hand, the precipitated gas is transferred to the gas-liquid separation tube through the drop pipe combined with the liquid level balance principle, and the liquid pressure during the injection of the propylene carbonate mixed liquid is further utilized. The key purpose is to utilize the difference between the gas pressure generated by the gas and the liquid pressure of the propylene carbonate mixed liquid to ensure that the precipitated gas is discharged in the form of an independent liquid.

[0049] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A de-impurity gas-liquid splitter for the production and processing of propylene carbonate, comprising a housing (1) and a heating assembly (2), characterized in that: A gas-liquid separation pipe (4) arranged vertically is installed at the center point of the upper surface of the shell (1), and a water outlet (101) and a water replenishment port (102) are respectively provided at the outer edge and the center point of the lower surface of the shell (1); A spiral sheet group (7) is arranged inside the shell (1), the heating component (2) is installed at a position below the spiral sheet group (7) of the shell (1), a cooperative component is arranged in the gas-liquid separation pipe (4), and a plurality of drop pipes (5) are installed on the upper surface of the shell (1); The cooperative assembly comprises a piston block (8), a partition block (14), a vortex fan group (11) and a filter cover (10) arranged from top to bottom, a movable guide tube (12) is fixedly installed between the vortex fan group (11) and the filter cover (10), a movable guide rod (9) is slidably installed in the movable guide tube (12), and the movable guide rod (9) is fixedly connected and slidably connected to the piston block (8) and the partition block (14).

2. The impurity-removing gas-liquid splitter for the production and processing of propylene carbonate according to claim 1, characterized in that: The spiral sheet group (7) is rotatably connected inside the shell (1), and the movable conduit (12) and the spiral sheet group (7) are slidably connected.

3. The impurity-removing gas-liquid splitter for the production and processing of propylene carbonate according to claim 1, characterized in that: The drop pipe (5) is composed of a plurality of empty pipes arranged vertically, the height of each empty pipe increasing in the direction from the center point of the shell (1) to the water outlet (101), and a gas-liquid transposition pipe (6) is installed between the empty pipe close to the water outlet (101) and the gas-liquid separation pipe (4).

4. The impurity-removing gas-liquid splitter for the production and processing of propylene carbonate according to claim 3, characterized in that: The gas-liquid separation tube (4) is provided with a gas outlet (103); the intersection of the gas-liquid transposition tube (6) and the gas-liquid separation tube (4) and the opening position of the gas outlet (103) are located in the middle of the piston block (8) and the separation block (14); the piston block (8), the separation block (14) and the inner wall of the gas-liquid separation tube (4) are respectively slidably connected and fixedly connected.

5. The impurity-removing gas-liquid splitter for the production and processing of propylene carbonate according to claim 3, characterized in that: A pressure cone cap (13) is installed on the lower side of the movable guide rod (13) corresponding to the partition block (14), and a through opening is opened on the outer wall of the movable guide rod (12) corresponding to the movable guide rod (9), and the lower end of the movable guide rod (12) is connected to the lower side of the filter cover (10).

6. The impurity-removing gas-liquid splitter for the production and processing of propylene carbonate according to claim 3, characterized in that: An airbag actuation component (3) is installed at the upper end of the air-liquid separation tube (4), and the actuation position of the airbag actuation component (3) is fixedly connected to the movable guide rod (9).

7. The impurity-removing gas-liquid splitter for the production and processing of propylene carbonate according to claim 1, characterized in that: A plurality of liquid guiding columns (15) are installed on the lower side of the piston block (8), and the liquid guiding columns (15) penetrate downward to the lower position of the partition block (14).

8. The impurity-removing gas-liquid splitter for the production and processing of propylene carbonate according to claim 7, characterized in that: The partition block (14) is provided with a liquid conducting groove corresponding to the liquid conducting column (15), the diameter of the liquid conducting groove is larger than the outer diameter of the liquid conducting column (15), and the liquid conducting column (15) corresponds to the blocking ball of the partition block (14).

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