A raw material proportioning device for preparing dimethyl carbonate

Abstract

This invention provides a raw material proportioning device for preparing dimethyl carbonate, comprising a raw material channel and a raw material proportioning container. For ethylene carbonate, since it is usually a solid or solid-liquid mixture, manual measurement is inconvenient during addition. This invention addresses the problem of pre-positioning it in a container, ensuring a precise amount is added. When ethylene carbonate needs to be added to the proportioning container, heating causes the stopper to open and separate from the container opening, allowing the ethylene carbonate inside to automatically flow into the proportioning container below. Furthermore, methanol and ionic liquids are metered and accurately added to the proportioning container using an automatic metering device, with the addition controlled by a valve.

Description

Technical Field

[0001] This invention relates to a raw material proportioning device for preparing dimethyl carbonate, specifically to a technology that facilitates the quantitative addition of ethylene carbonate from raw materials and achieves automatic addition by changing the state of the raw materials. Background Technology

[0002] Dimethyl carbonate is a very important chemical substance with the molecular formula C5H. 10 O3 is a reagent miscible with solvents such as alcohols, ketones, esters, and aromatics, and can be used as an intermediate in organic and pharmaceutical synthesis. Additionally, it can be used as a solvent for resins, oils, nitrocellulose, and cellulose ethers.

[0003] In the preparation of dimethyl carbonate, ethylene carbonate is frequently used as a raw material. For example, Chinese invention patent application CN201911253631.3 discloses a method for preparing dimethyl carbonate. This patent describes the basic synthetic reaction process, which involves contacting raw materials containing ethylene carbonate and methanol with a catalyst to react and obtain the dimethyl carbonate. It is evident that ethylene carbonate plays a very fundamental and important role in this chemical synthesis.

[0004] In industrial production, to improve efficiency and achieve continuous production or chemical reactions, mechanization and automation of material feeding are necessary. However, for such chemical reactions, ethylene carbonate is often difficult to add during the feeding process due to its unique properties. Since ethylene carbonate has a melting point between 35 and 38°C, it is usually in a solid state before being stored or added to the reaction vessel. Feeding this solid material presents two problems. First, metering is very inconvenient, unlike liquid materials which can be quickly measured using flow meters. Second, the added ethylene carbonate requires subsequent quantitative control, a process that typically requires manual intervention and cannot be quickly automated. This limits the use of ethylene carbonate in the preparation of dimethyl carbonate. Summary of the Invention

[0005] To address the problems existing in the above-mentioned technologies, the present invention provides a raw material proportioning device for preparing dimethyl carbonate, which has pre-prepared raw materials and facilitates automatic feeding of solid ethylene carbonate.

[0006] The present invention provides a raw material proportioning device for preparing dimethyl carbonate, which includes a raw material channel and a raw material proportioning container;

[0007] The raw material channel includes a first branch pipe, a second branch pipe, and a third branch pipe, wherein the first branch pipe is used for transporting the ethylene carbonate container, the second branch pipe is used for transporting methanol, and the third branch pipe is used for transporting ionic liquids; the end of the first branch pipe has a heating structure for heating the ethylene carbonate container, the bottom of the ethylene carbonate container has a stopper, and at least a portion of the stopper is connected to the side of the container.

[0008] The raw material proportioning container has an upper inlet and a lower outlet. The upper inlet is connected to the ends of the first branch pipe, the second branch pipe, and the third branch pipe, and the lower outlet is connected to the reactor.

[0009] The beneficial effects of the above scheme are as follows: For ethylene carbonate raw materials, since they are usually solid or a solid-liquid mixture, manual measurement is very inconvenient when adding them. This scheme addresses the problem of pre-positioning them in containers, ensuring a precise amount is added. When ethylene carbonate needs to be added to the mixing container, heating causes the stopper to open and separate from the container opening, allowing the ethylene carbonate inside to automatically flow into the mixing container below. Furthermore, methanol and ionic liquids are measured and accurately added to the mixing container using an automatic metering device, with the addition controlled by a valve.

[0010] In addition, in some cases, other trace excipients may need to be added, which can be measured and added manually.

[0011] A preferred embodiment is that multiple sets of the ethylene carbonate containers are stacked inside the first branch pipe, the ethylene carbonate having a neck; an upper stop and a lower stop are provided below the first branch pipe, the upper stop and the lower stop including a stop cylinder and a stop plate, the stop plate of the upper stop being used to restrict the downward movement of the second lowest ethylene carbonate container, and the lower stop being used to restrict the downward movement of the lowest ethylene carbonate container;

[0012] The first branch pipe has an opening on one side, the opening has a side stop, the side stop has a lifting cylinder and a baffle, the baffle blocks the position of the opening, and one side of the opening is connected to a side channel.

[0013] The beneficial effects of the above solution are as follows: through the cooperation of the upper and lower stop components, the containers can move downwards one by one, allowing them to alternately move to positions near the opening, with the bottom container completing the filling action. After the filling action is completed, the side opening baffle is opened, and the empty container is discharged from the side channel through a pushing action, ready for the filling action of the next container.

[0014] In a preferred embodiment, the raw material mixing container has a heating unit and a stirrer, the second branch pipe has a first flow meter and a first control valve, and the second branch pipe is connected to the methanol container; the third branch pipe has a second flow meter and a second control valve, and the third branch pipe is connected to the ionic liquid.

[0015] The operating method of the raw material proportioning device for preparing dimethyl carbonate provided by the present invention includes the following steps:

[0016] The ethylene carbonate container is transported through the first branch pipe. When the ethylene carbonate container moves to the upper inlet position, the heating structure heats the ethylene carbonate container at the bottom position, causing the solid ethylene carbonate in the bottom position container to change into liquid. As the volume of the liquid expands or the pressure inside the container increases, the stopper on the container eventually opens, allowing the liquid ethylene carbonate in the container to flow out and enter the raw material proportioning container.

[0017] Methanol is supplied to the raw material mixing container through the second branch pipe, while ionic liquid is supplied to the raw material mixing container through the third branch pipe. The raw materials are mixed and preheated in the raw material mixing container. Then, the mixed liquid in the raw material mixing container is discharged into the reactor through the lower outlet to carry out the chemical reaction.

[0018] The operating method of the raw material proportioning device for preparing dimethyl carbonate provided by the present invention includes the following steps:

[0019] Multiple sets of ethylene carbonate containers move downwards one by one within the first branch pipe, allowing the ethylene carbonate containers to gradually move down to a position close to the upper inlet and complete the feeding action; in addition, the upper stop stops the containers below, and when it is necessary to move the containers below below down, the upper stop stops are released, allowing the containers below below to move to the lowest position, and then be stopped by the lower stop at the lowest position;

[0020] In addition, the lower brake blocks the container at the bottom position from the side so that the container at the bottom abuts against the side stop on the opening on one side. After the feeding action is completed, the side stop opens and the opening opens. Then, the container at the bottom of the empty bottle moves to the side channel on one side under the action of the lower stop.

[0021] The operating method of the raw material proportioning device for preparing dimethyl carbonate provided by the present invention includes the following steps:

[0022] Multiple raw materials are added to the raw material mixing container, and then preheated by the heating unit but below the reaction temperature. The mixture is then stirred and mixed evenly by the stirrer. The chemical reaction is carried out in the reactor below. After the reaction in the reactor below is completed, the reacted material is discharged and the pre-prepared reaction liquid in the raw material mixing container is discharged into the reactor for continuous reaction. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the raw material proportioning device for preparing dimethyl carbonate according to the present invention.

[0024] Figure 2 yes Figure 1 A schematic diagram of the first branch pipe and the raw material proportioning container in the local structure.

[0025] Figure 3 This is a schematic diagram showing the assembly of the first branch pipe, container, and side channel of the present invention.

[0026] Figure 4 yes Figure 3 A magnified view of a local area.

[0027] Figure 5 This is a schematic diagram of the container after the stopper of the present invention has been opened.

[0028] Figure 6 This is a schematic diagram showing the fit between the neck and the inlet of the container of the present invention. Detailed Implementation

[0029] First embodiment:

[0030] like Figure 1 As shown, the present invention provides a raw material proportioning device for preparing dimethyl carbonate, which includes a raw material channel 10 and a raw material proportioning container 20.

[0031] The raw material channel 10 includes a first branch pipe 11, a second branch pipe 12 and a third branch pipe 13, wherein the first branch pipe 11 is used for transporting ethylene carbonate container 14, the second branch pipe 12 is used for transporting methanol and the third branch pipe 13 is used for transporting ionic liquid; the end of the first branch pipe 11 has a heating structure 15.

[0032] The heating structure is preferably located at the bottom of the first branch pipe, that is, to heat the container at the bottom so that the stopper of the container at the bottom opens and the contents flow out. The heating structure 15 is used to heat the ethylene carbonate container 14, the bottom of the ethylene carbonate container 14 has a stopper 16, at least a portion of the stopper 16 is connected to the side of the container 14;

[0033] The raw material proportioning container 20 has an upper inlet 17 and a lower outlet 18. There can be one or more upper inlets, each individually connected to a first branch pipe, a second branch pipe, and a third branch pipe. A valve is installed at the lower outlet. The upper inlet 17 is connected to the ends of the first branch pipe 11, the second branch pipe 12, and the third branch pipe 13, while the lower outlet 18 is connected to the reactor. The reactor is a conventional reaction vessel capable of heating and stirring, and preferably allows for pressure control or the addition of other required materials.

[0034] For ethylene carbonate raw materials, since they are usually solid or solid-liquid mixtures, it is very inconvenient to add them manually. To address this, a pre-stored container 14 is used, storing the ethylene carbonate quantitatively within it, ensuring a precise amount is added. When ethylene carbonate needs to be added to the mixing container 14, heating causes the stopper to open, separating it from the opening of container 14, allowing the ethylene carbonate inside container 14 to automatically flow into the mixing container below. Furthermore, methanol and ionic liquid materials are measured and accurately added to the mixing container 14 using an automatic metering device, with the addition controlled by a valve.

[0035] In the actual reaction, a container of ethylene carbonate can be manually added to the first branch tube each time. After heating this container at the bottom, the stopper is opened to allow the addition of the ethylene carbonate. After addition, the container is manually removed. It should be noted that the bottom of the container has a neck 161 that is larger than the inlet; that is, the neck 161 will stop at the inlet 171 (upper inlet 17) in preparation for subsequent additions. See reference [link / reference needed] for details. Figure 6 , Figure 6 The neck 161 is positioned at the inlet 171. Alternatively, a robotic arm can be used to grab a container and insert it into the first branch pipe each time material needs to be added. When the container is at the bottom of the first branch pipe, it is heated to open the stopper, completing the material addition. Then, the robotic arm grabs the container and moves it outside the first branch pipe.

[0036] In addition, in some cases, other trace excipients may need to be added, which can be measured and added manually.

[0037] The operating method of the raw material proportioning device for preparing dimethyl carbonate provided by the present invention includes the following steps:

[0038] The ethylene carbonate container 14 is transported through the first branch pipe 11. When the ethylene carbonate container 14 moves to the upper inlet 17 position, the heating structure 15 heats the ethylene carbonate container 14 at the lowest position, so that the solid ethylene carbonate in the ethylene carbonate container 14 at the lowest position changes into liquid. As the volume of the liquid expands or the pressure in the container 14 increases, the stopper 16 on the container 14 is eventually opened, so that the liquid ethylene carbonate in the container 14 flows out and enters the raw material proportioning container 20.

[0039] Methanol is supplied to the raw material mixing container 20 through the second branch pipe 12, while ionic liquid is supplied to the raw material mixing container 20 through the third branch pipe 13. The raw materials are mixed and preheated in the raw material mixing container 20. Then the mixed liquid in the raw material mixing container 20 is discharged into the reactor through the lower outlet 18 to carry out the chemical reaction.

[0040] Second embodiment:

[0041] In this embodiment, multiple sets of ethylene carbonate containers 14 are stacked inside the first branch pipe 11. Each ethylene carbonate container has a neck 161. An upper stop 30 and a lower stop 31 are provided below the first branch pipe 11. The upper stop 30 and the lower stop 31 include a stop cylinder 32 and a stop plate 33. The stop cylinder can also be replaced by an electric telescopic rod, that is, the stop plate 33 is moved by the electric telescopic rod. The stop plate 33 of the upper stop 30 is used to restrict the downward movement of the second lowest ethylene carbonate container 141, while the lower stop is used to restrict the downward movement of the lowest ethylene carbonate container 142. The upper stop and the lower stop can work independently. The lower stop presses down on the lowest container so that the lowest container stays at the lowest position. After the feeding action is completed, the side opening 35 is opened, and then the empty container can be moved from the side opening 35 into the side channel 39 through the lower stop. When it is necessary to stop the container in a certain position, simply press the stop plate 33 of the stop member against the container, and the container will automatically move closer to the inner wall of the first branch pipe, thereby stopping the container in a certain position.

[0042] In a further preferred embodiment, the upper stop and the lower stop are mechanical gripper structures, that is, the gripper can tighten or loosen. When tightened, it secures and controls the container to stop, while when loosened, it allows the container to move downward. The lower stop has a left and right extension function, so the container at the bottom position can be tightened and then horizontally extended to allow the empty bottle to enter the side channel 39.

[0043] The first branch pipe 11 has an opening 35 on one side, the opening 35 having a side stop 36, the side stop 36 having a lifting cylinder 37 and a baffle 38, the baffle 38 blocking the opening 35, and one side of the opening 35 connecting to a side channel 39. Preferably, the side opening 35 has a baffle, which can also be manually locked and opened, and a heating structure can be provided on the baffle for heating the lowermost container.

[0044] The upper stop 30 and the lower stop 31 work together to allow the containers 14 to move downwards one by one, so that the containers 14 can alternately move to a position close to the opening 35, and then the feeding action is completed in the bottommost container 14. After the feeding action is completed, the baffle 38 of the side opening 35 is opened, and the empty container 14 is discharged from the side channel 39 by pushing action, and then it can be used for the feeding action of the next container 14.

[0045] The operating method of the raw material proportioning device for preparing dimethyl carbonate provided by the present invention includes the following steps:

[0046] Multiple sets of ethylene carbonate containers 14 move downwards one by one within the first branch pipe 11, thereby allowing the ethylene carbonate containers 14 to gradually move down to a position close to the upper inlet 17 and complete the feeding action; in addition, the upper stop member blocks the container 14 below, and when it is necessary to move the container 14 below to the bottom, the upper stop member is released, allowing the container 14 below to move to the bottommost position, and then the lower stop member completes the blocking at the bottommost position;

[0047] In addition, the lower brake blocks the container 14 at the bottom position to the side so that the container 14 at the bottom position abuts against the side stop on the opening on one side. After the feeding action is completed, the side stop opens and the opening is opened. Then, the container 14 at the bottom position of the empty bottle moves to the side channel on one side under the action of the lower stop.

[0048] Third embodiment:

[0049] The raw material mixing container 20 has a heating unit and a stirrer 28. The second branch pipe 12 has a first flow meter and a first control valve. The second branch pipe 12 is connected to the methanol container 31. The third branch pipe 13 has a second flow meter and a second control valve. The third branch pipe 13 is connected to the ionic liquid storage device 29.

[0050] The operating method of the raw material proportioning device for preparing dimethyl carbonate provided by the present invention includes the following steps:

[0051] Multiple raw materials are added to the raw material mixing container 20, and then preheated by the heating unit but below the reaction temperature. The mixture is then stirred and mixed evenly by the stirrer. The chemical reaction is carried out in the reactor below. After the reaction in the reactor below is completed, the reacted material is discharged and discharged into the reactor through the pre-prepared reaction liquid in the raw material mixing container 20 for continuous reaction.

[0052] In other embodiments, the stop plate of the upper stop member is inserted between the next lower container and the lowest container, and the stop plate has a heat insulation layer that acts as a barrier to the containers above the next lower container. This prevents the heating structure from affecting the contents of the containers above when it heats and melts the lowest container.

[0053] It should be noted that the pressure required to open the bottle stopper from the container can be set. For example, different pressures can be set, and the stopper can be opened by heating to different internal temperatures. For example, the stopper will automatically open after the temperature rises to 45℃ or 55℃.

[0054] In a further embodiment, a pressing member is provided on the lower side of the first branch pipe, i.e. on the top side of the mixing container. The pressing member has a telescopic rod and a telescopic plate. The telescopic plate can contact the outside of the bottle stopper, and then move the bottle stopper toward the opening position of the neck so that the bottle stopper is automatically closed after the feeding action is completed. Then the lower stop member pushes the bottle out into the side channel on one side.

[0055] Alternatively, the heating structure can be omitted or only slightly heated. Then, the side of the container is pressed by the baffle of the lower stop. Since the container is made of elastic plastic, the pressure inside the container increases after being pressed and heated, or under the pressure alone, thus forcing the lower stopper to open. After the stopper is opened, it can be used for feeding. In this process, the push plate of the lower stop has multiple functions, namely assisting in opening the stopper and pushing it into the side channel after the side opening is opened later.

Claims

1. A raw material proportioning device for preparing dimethyl carbonate, characterized in that, include: The raw material channel includes a first branch pipe, a second branch pipe, and a third branch pipe, wherein the first branch pipe is used for transporting the ethylene carbonate container, the second branch pipe is used for transporting methanol, and the third branch pipe is used for transporting ionic liquids; the end of the first branch pipe has a heating structure for heating the ethylene carbonate container, the bottom of the ethylene carbonate container has a stopper, and at least a portion of the stopper is connected to the side of the ethylene carbonate container. A raw material proportioning container has an upper inlet and a lower outlet. The upper inlet is connected to the ends of the first branch pipe, the second branch pipe, and the third branch pipe, and the lower outlet is connected to the reactor. Multiple sets of the ethylene carbonate containers are stacked inside the first branch pipe, and the ethylene carbonate containers have necks; an upper stop and a lower stop are provided below the first branch pipe, the upper stop and the lower stop including a stop cylinder and a stop plate, the stop plate of the upper stop is used to restrict the downward movement of the second lowest ethylene carbonate container, and the lower stop is used to restrict the downward movement of the lowest ethylene carbonate container. The first branch pipe has an opening on one side, the opening has a side stop, the side stop has a lifting cylinder and a baffle, the baffle blocks the position of the opening, and one side of the opening is connected to a side channel.

2. The raw material proportioning device for preparing dimethyl carbonate according to claim 1, characterized in that, The raw material mixing container has a heating unit and a stirrer. The second branch pipe has a first flow meter and a first control valve and is connected to the methanol container. The third branch pipe has a second flow meter and a second control valve and is connected to the ionic liquid storage device.

3. The raw material proportioning device for preparing dimethyl carbonate according to claim 1, characterized in that, The ethylene carbonate container is transported through the first branch pipe. When the ethylene carbonate container moves to the upper inlet position, the heating structure heats the ethylene carbonate container at the bottom position, causing the solid ethylene carbonate in the bottom position container to change into liquid. As the volume of the liquid expands or the pressure inside the container increases, the stopper on the container eventually opens, allowing the liquid ethylene carbonate in the container to flow out and enter the raw material proportioning container. Methanol is supplied to the raw material mixing container through the second branch pipe, while ionic liquid is supplied to the raw material mixing container through the third branch pipe. The raw materials are mixed and preheated in the raw material mixing container. Then, the mixed liquid in the raw material mixing container is discharged into the reactor through the lower outlet to carry out the chemical reaction.

4. The raw material proportioning device for preparing dimethyl carbonate according to claim 3, characterized in that, Multiple sets of ethylene carbonate containers move downwards one by one in the first branch pipe, allowing the ethylene carbonate containers to gradually move down to a position close to the upper inlet and complete the feeding action; in addition, the upper stop stops the second lowest container, and when it is necessary to move the second lowest container down, the upper stop stops are released, allowing the second lowest container to move to the lowest position, and then be stopped by the lower stop at the lowest position; In addition, the lower stop blocks the container at the bottom position from the side so that the container at the bottom abuts against the side stop on the opening on one side. After the feeding action is completed, the side stop opens and the opening opens. Then, the container at the bottom of the empty bottle moves to the side channel on one side under the action of the lower stop.

5. The raw material proportioning device for preparing dimethyl carbonate according to claim 3, characterized in that, Multiple raw materials are added to the raw material mixing container, and then preheated by the heating unit but below the reaction temperature. The mixture is then stirred and mixed evenly by the stirrer. The chemical reaction is carried out in the reactor below. After the reaction in the reactor below is completed, the reacted material is discharged and the pre-prepared reaction liquid in the raw material mixing container is discharged into the reactor for continuous reaction.

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