Device for synthesizing ethylene carbonate by using heterogeneous catalyst
By adding an intermediate buffer tank and a small refrigerator to the ethylene carbonate preparation unit, reaction control was optimized, the problems of insufficient cold capacity and high energy consumption were solved, and energy consumption was reduced and process control was improved.
Patent Information
- Application Number
- CN202422768138.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-13
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-13
AI Technical Summary
In the existing preparation of ethylene carbonate, the cooling capacity of the homogeneous catalyst is not fully utilized, the cooling capacity of the carbon dioxide vaporizer is not fully recycled, the reaction process control is not optimized, and there is a problem of high energy consumption.
A multi-phase catalyst synthesis device is used. By installing an intermediate buffer tank in the condenser of the carbon dioxide vaporizer, utilizing the cooling capacity of the carbon dioxide vaporizer, installing an intermediate buffer tank of the intermediate buffer tank, installing a small refrigerator, and adding an intermediate buffer tank between the first synthesis reactor and the second synthesis reactor, the reaction control is optimized.
It realizes full utilization of cooling capacity, reduces energy consumption, optimizes reaction control, and improves process control effect.
Smart Images
Figure CN223366892U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of ethylene carbonate preparation, in particular to a device for synthesizing ethylene carbonate with a multiphase catalyst. Background Art
[0002] Ethylene carbonate (EC) is an excellent organic solvent that dissolves a variety of polymers and is the primary raw material for the transesterification process to produce dimethyl carbonate. With the rapid development of new energy vehicles and the energy storage industry in recent years, demand for high-purity, electronic-grade ethylene carbonate, an indispensable electrolyte solvent for automotive lithium batteries, has also grown. Ethylene carbonate's primary functions in lithium-ion battery electrolytes are: first, it inhibits electrolyte decomposition, thereby enhancing electrolyte stability; second, it exhibits low polarization and long cycle life. In mixed electrolytes, it can also improve battery polarization and cycling stability, thereby increasing the battery's coulombic efficiency.
[0003] In the preparation of ethylene carbonate, the homogeneous catalyst of the homogeneous catalytic process initially used is "dissolved" into the product. This requires the continuous replacement of some catalysts during the production process to prevent the accumulation of heavy components generated during the reaction in the reaction system; the mixture of homogeneous catalyst and heavy components also requires special treatment, otherwise it will affect the environment; the catalyst of the later heterogeneous catalytic process is insoluble in the product, such as the metal oxide system CeO2-ZrO2 as a catalyst, which does not affect the recycling performance and does not require separation equipment and process pipelines, which can essentially solve the above-mentioned problems of the homogeneous catalytic process. However, there are two problems: first, the cooling capacity of the carbon dioxide vaporizer is not fully recycled, and the subsequent condenser still needs cooling capacity to cool down; second, there is still room for optimization in the control of the reaction process. Utility Model Content
[0004] The purpose of the present utility model is to address the above-mentioned defects of the prior art and to provide a device for synthesizing ethylene carbonate using a multiphase catalyst, which makes full use of the cooling capacity of the carbon dioxide vaporizer and is equipped with a small refrigerator, thereby reducing energy consumption. In addition, an intermediate buffer tank is installed between the first synthesis reactor and the second synthesis reactor, so that the intermediate product can be better controlled to return to the first synthesis reactor to continue to participate in the synthesis, thereby achieving optimization of reaction control.
[0005] The utility model discloses a device for synthesizing ethylene carbonate using a heterogeneous catalyst, and its technical solution is as follows: comprising a first synthesis reactor (R201), a second synthesis reactor (R202), a carbon dioxide vaporizer (E101), a circulating heat exchanger (E102), a falling film evaporator (E301), a foam removal tank (E302), a condenser (E303), and a product storage tank (V301), wherein the lower side of the first synthesis reactor (R201) is connected to the catalyst storage tank (V103) via a pipeline and the circulating heat exchanger (E102), the upper side of the first synthesis reactor (R201) is connected to the ethylene oxide storage tank (V102) via a pipeline and a second feed pump (P102), the middle side line of the first synthesis reactor (R201) is connected to the carbon dioxide storage tank (V101) via a pipeline and the carbon dioxide vaporizer (E101), the lower end of the first synthesis reactor (R201) is connected to the lower side of the second synthesis reactor (R202) via a pipeline, and the second synthesis reactor (R202) is connected to the lower side of the catalyst storage tank (V103). The upper end of the kettle (R202) is connected to the upper end of the falling film evaporator (E301) through a pipeline, the lower end of the falling film evaporator (E301) is connected to the defoaming storage tank (E302) through a pipeline, and the upper end of the defoaming storage tank (E302) is connected to the product storage tank (V301) through a pipeline and a condenser (E303); the pipe side inlet of the carbon dioxide vaporizer (E101) is connected to the circulating water inlet (a1), and the pipe side outlet of the carbon dioxide vaporizer (E101) is connected to the circulating water inlet (a1). Circulating water outlet (a2); the shell-side inlet of the condenser (E303) is connected to the condensed water inlet pipe (c1), and the shell-side outlet of the condenser (E303) is connected to the condensed water outlet pipe (c2); the circulating water outlet (a2) is connected to the condensed water inlet pipe (c1) of the condenser (E303) through a pipeline and a small refrigerator (M201), and the condensed water outlet pipe (c2) is connected to the circulating water inlet (a1) of the carbon dioxide vaporizer (E101) through a pipeline.
[0006] Preferably, the lower end of the falling film evaporator (E301) is connected to the side line of the defoaming storage tank (E302) through a pipeline, the upper end of the defoaming storage tank (E302) is connected to the tube-side inlet of the condenser (E303) through a pipeline, the lower end of the defoaming storage tank (E302) is connected to the catalyst recovery storage tank through a pipeline, and the tube-side outlet of the condenser (E303) is connected to the product storage tank (V301) through a pipeline.
[0007] Preferably, the lower end of the above-mentioned catalyst storage tank (V103) is connected to the shell-side inlet of the circulation heat exchanger (E102) through a pipeline and a third feed pump (P103), the shell-side outlet of the circulation heat exchanger (E102) is connected to the lower side of the first synthesis reactor (R201) through a pipeline, the tube-side inlet of the circulation heat exchanger (E102) is connected to the circulation heating pipeline inlet (b1), and the tube-side outlet of the circulation heat exchanger (E102) is connected to the circulation heating pipeline outlet (b2).
[0008] Preferably, the lower end of the above-mentioned carbon dioxide storage tank (V101) is connected to the shell-side inlet of the carbon dioxide vaporizer (E101) through a pipeline and the first feed pump (P101), and the shell-side outlet of the carbon dioxide vaporizer (E101) is connected to the middle part of the side line of the first synthesis reactor (R201) through a pipeline.
[0009] Preferably, the falling film evaporator (E301) comprises a falling film evaporator body (3.1), a film-hanging plate (3.2), an upper cover (3.3), a lower shell (3.4), a steam inlet pipe (3.5), a steam outlet pipe (3.6), a material inlet (3.7), and a material outlet (3.8). The upper portion of the falling film evaporator body (3.1) is provided with an upper cover (3.3), and the lower portion is provided with a lower shell (3.4). The film-hanging plates (3.2) are evenly distributed in the inner cavity of the falling film evaporator body (3.1). The material inlet (3.7) is arranged on the upper portion of the upper cover (3.3), and the material outlet (3.8) is arranged on the lower portion of the lower shell (3.4). The steam inlet pipe (3.5) is provided on the lower side of the falling film evaporator body (3.1), and the steam outlet pipe (3.6) is provided on the upper side.
[0010] Preferably, the inner cavity of the above-mentioned defoaming tank (E302) is filled with multiple layers of steel wire mesh for defoaming.
[0011] Preferably, the lower end of the first synthesis reactor (R201) is connected to the intermediate buffer tank (V201) through a pipeline, and the lower end of the intermediate buffer tank (V201) is connected to the pipeline at the output end of the second feed pump (P102) through a circulation pipeline (d1) and an intermediate circulation pump (P201) to form a circulation.
[0012] Preferably, a control valve ( f1 ) is installed on the circulation line ( d1 ).
[0013] The beneficial effects of the present invention are as follows: on the one hand, the present invention fully utilizes the cold energy generated by the vaporization of the liquid carbon dioxide vaporizer, and adds a small refrigerator, thereby greatly reducing energy consumption and improving economic benefits; in addition, by installing an intermediate buffer tank between the first synthesis kettle and the second synthesis kettle, the intermediate product can be better controlled to return to the first synthesis kettle to continue to participate in the synthesis, thereby optimizing the reaction control and improving the process control; furthermore, the falling film evaporator is connected to the upper end outlet of the second synthesis kettle, which can better realize the falling film evaporation treatment. BRIEF DESCRIPTION OF THE DRAWINGS
[0014] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;
[0015] Figure 2 This is a schematic structural diagram of Example 2 of the present utility model;
[0016] Figure 3It is a structural diagram of a falling film evaporator;
[0017] In the figure above: first synthesis reactor R201, second synthesis reactor R202, carbon dioxide vaporizer E101, circulating heat exchanger E102, falling film evaporator E301, defoaming tank E302, condenser E303, product tank V301, first feed pump P101, second feed pump P102, third feed pump P103, intermediate buffer tank V201, intermediate circulation pump P201, small refrigerator M201, falling film evaporator body 3.1, film forming plate 3.2, upper cover 3.3, lower shell 3.4, steam inlet pipe 3.5, steam outlet pipe 3.6, material inlet 3.7, material outlet 3.8, circulating water inlet a1, circulating water outlet a2, circulating heating line inlet b1, circulating heating line outlet b2, condensed water inlet pipe c1, condensed water outlet pipe c2, circulating pipeline d1, control valve f1. DETAILED DESCRIPTION
[0018] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention and are not used to limit the present invention.
[0019] Example 1, with reference to Figure 1 and Figure 3The utility model mentions a device for synthesizing ethylene carbonate using a multiphase catalyst, comprising a first synthesis reactor R201, a second synthesis reactor R202, a carbon dioxide vaporizer E101, a circulating heat exchanger E102, a falling film evaporator E301, a defoaming storage tank E302, a condenser E303, and a product storage tank V301. The lower side of the first synthesis reactor R201 is connected to the catalyst storage tank V103 via a pipeline and the circulating heat exchanger E102. The upper side of the first synthesis reactor R201 is connected to the ethylene oxide storage tank V102 via a pipeline and a second feed pump P102. The side line in the middle of the first synthesis reactor R201 is connected to the carbon dioxide storage tank V101 via a pipeline and the carbon dioxide vaporizer E101. The lower end of the first synthesis reactor R201 is connected to the lower side of the second synthesis reactor R202 via a pipeline. The second synthesis reactor R202 is connected to the catalyst storage tank V103 via a pipeline and a circulating heat exchanger E102. The upper end of the kettle R202 is connected to the upper end of the falling film evaporator E301 through a pipeline, the lower end of the falling film evaporator E301 is connected to the defoaming storage tank E302 through a pipeline, and the upper end of the defoaming storage tank E302 is connected to the product storage tank V301 through a pipeline and the condenser E303; the tube side inlet of the carbon dioxide vaporizer E101 is connected to the circulating water inlet a1, and the tube side outlet of the carbon dioxide vaporizer E101 is connected to the circulating water outlet a2; the shell side inlet of the condenser E303 is connected to the condensed water inlet pipe c1, and the shell side outlet of the condenser E303 is connected to the condensed water outlet pipe c2; the circulating water outlet a2 is connected to the condensed water inlet pipe c1 of the condenser E303 through a pipeline and the small refrigerator M201, and the condensed water outlet pipe c2 is connected to the circulating water inlet a1 of the carbon dioxide vaporizer E101 through a pipeline.
[0020] Among them, the lower end of the above-mentioned falling film evaporator E301 is connected to the side line of the defoaming storage tank E302 through a pipeline, the upper end of the defoaming storage tank E302 is connected to the pipe side inlet of the condenser E303 through a pipeline, the lower end of the defoaming storage tank E302 is connected to the catalyst recovery storage tank through a pipeline, and the pipe side outlet of the condenser E303 is connected to the product storage tank V301 through a pipeline.
[0021] The lower end of the above-mentioned catalyst storage tank V103 is connected to the shell-side inlet of the circulation heat exchanger E102 through a pipeline and the third feed pump P103. The shell-side outlet of the circulation heat exchanger E102 is connected to the lower side of the first synthesis reactor R201 through a pipeline. The tube-side inlet of the circulation heat exchanger E102 is connected to the circulation heating pipeline inlet b1, and the tube-side outlet of the circulation heat exchanger E102 is connected to the circulation heating pipeline outlet b2.
[0022] The lower end of the carbon dioxide storage tank V101 is connected to the shell side inlet of the carbon dioxide vaporizer E101 through a pipeline and the first feed pump P101, and the shell side outlet of the carbon dioxide vaporizer E101 is connected to the middle of the side line of the first synthesis reactor R201 through a pipeline.
[0023] Reference Figure 3The falling film evaporator E301 mentioned in the present invention includes a falling film evaporator body 3.1, a film hanging plate 3.2, an upper cover 3.3, a lower shell 3.4, a steam inlet pipe 3.5, a steam outlet pipe 3.6, a material inlet 3.7, and a material outlet 3.8. The upper part of the falling film evaporator body 3.1 is provided with an upper cover 3.3, and the lower part is provided with a lower shell 3.4. The film hanging plates 3.2 are evenly distributed in the inner cavity of the falling film evaporator body 3.1, the material inlet 3.7 is installed on the upper part of the upper cover 3.3, and the material outlet 3.8 is provided at the lower part of the lower shell 3.4. The steam inlet pipe 3.5 is provided on the lower side of the falling film evaporator body 3.1, and the steam outlet pipe 3.6 is provided on the upper side.
[0024] The inner cavity of the above-mentioned defoaming tank E302 is filled with multiple layers of steel wire mesh for defoaming.
[0025] When the utility model is used, the ethylene oxide in the ethylene oxide storage tank V102 is fed into the upper side of the first synthesis reactor R201 by the second feed pump P102, the liquid carbon dioxide in the carbon dioxide storage tank V101 is fed into the carbon dioxide vaporizer E101 by the first feed pump P101, and the gaseous carbon dioxide formed after vaporization is fed into the middle of the side line of the first synthesis reactor R201, and the metal oxide system CeO2-ZrO2 in the catalyst storage tank V103 is fed into the first synthesis reactor R201 by the third feed pump P103 and the circulating heat exchanger E102. The lower side of the synthesis reactor R201; after the synthesis is completed in the first synthesis reactor R201, it is sent to the second synthesis reactor R202 for further synthesis. The generated crude ethylene carbonate is discharged to the falling film evaporator E301 through the top of the second synthesis reactor R202, enters the inner cavity of the falling film evaporator body 3.1 through the material inlet 3.7, then moves downward along the film plate 3.2 and is discharged through the material outlet 3.8. The foam is then removed from the defoaming tank E302, and then sent to the condenser E303 for condensation and then sent to the ethylene carbonate product storage tank V301.
[0026] Example 2, the utility model mentioned a heterogeneous catalyst synthesis ethylene carbonate device, comprising a first synthesis reactor R201, a second synthesis reactor R202, a carbon dioxide vaporizer E101, a circulating heat exchanger E102, a falling film evaporator E301, a defoaming storage tank E302, a condenser E303, and a product storage tank V301. The lower side of the first synthesis reactor R201 is connected to the catalyst storage tank V103 through a pipeline and the circulating heat exchanger E102, the upper side of the first synthesis reactor R201 is connected to the ethylene oxide storage tank V102 through a pipeline and a second feed pump P102, the middle side line of the first synthesis reactor R201 is connected to the carbon dioxide storage tank V101 through a pipeline and the carbon dioxide vaporizer E101, the lower end of the first synthesis reactor R201 is connected to the lower side of the second synthesis reactor R202 through a pipeline, and the second The upper end of the synthesis kettle R202 is connected to the upper end of the falling film evaporator E301 through a pipeline, the lower end of the falling film evaporator E301 is connected to the defoaming storage tank E302 through a pipeline, and the upper end of the defoaming storage tank E302 is connected to the product storage tank V301 through a pipeline and the condenser E303; the tube side inlet of the carbon dioxide vaporizer E101 is connected to the circulating water inlet a1, and the tube side outlet of the carbon dioxide vaporizer E101 is connected to the circulating water outlet a2; the shell side inlet of the condenser E303 is connected to the condensed water inlet pipe c1, and the shell side outlet of the condenser E303 is connected to the condensed water outlet pipe c2; the circulating water outlet a2 is connected to the condensed water inlet pipe c1 of the condenser E303 through a pipeline and a small refrigerator M201, and the condensed water outlet pipe c2 is connected to the circulating water inlet a1 of the carbon dioxide vaporizer E101 through a pipeline.
[0027] The difference from Example 1 is:
[0028] Reference Figure 2 In this embodiment, the lower end of the first synthesis reactor R201 is connected to the intermediate buffer tank V201 via a pipeline. The lower end of the intermediate buffer tank V201 is connected to the pipeline at the output end of the second feed pump P102 via a circulation pipeline d1 and an intermediate circulation pump P201 to form a circulation. For ease of control, a control valve f1 is installed on the circulation pipeline d1; this allows for better control of the intermediate product returning to the first synthesis reactor to continue synthesis, thereby optimizing reaction control and improving process control.
[0029] The above description is merely a preferred embodiment of the present invention. Anyone skilled in the art may utilize the above-described technical solutions to modify the present invention or create equivalent technical solutions. Therefore, any simple modifications or equivalent transformations based on the technical solutions of the present invention fall within the scope of protection claimed by the present invention.
Claims
1. A device for synthesizing ethylene carbonate using a heterogeneous catalyst, characterized in that: The invention comprises a first synthesis reactor (R201), a second synthesis reactor (R202), a carbon dioxide vaporizer (E101), a circulating heat exchanger (E102), a falling film evaporator (E301), a defoaming storage tank (E302), a condenser (E303), and a product storage tank (V301). The lower side of the first synthesis reactor (R201) is connected to the catalyst storage tank (V103) through a pipeline and the circulating heat exchanger (E102). The upper side of the first synthesis reactor (R201) is connected to the ethylene oxide storage tank (V102) through a pipeline and a second feed pump (P102). The side line in the middle of the first synthesis reactor (R201) is connected to the carbon dioxide storage tank (V101) through a pipeline and the carbon dioxide vaporizer (E101). The lower end of the first synthesis reactor (R201) is connected to the lower side of the second synthesis reactor (R202) through a pipeline. The upper end of the second synthesis reactor (R202) is connected to The upper end of the falling film evaporator (E301) and the lower end of the falling film evaporator (E301) are connected to the defoaming storage tank (E302) through a pipeline, and the upper end of the defoaming storage tank (E302) is connected to the product storage tank (V301) through a pipeline and a condenser (E303); the tube-side inlet of the carbon dioxide vaporizer (E101) is connected to the circulating water inlet (a1), and the tube-side outlet of the carbon dioxide vaporizer (E101) is connected to the circulating water outlet (a2); the shell-side inlet of the condenser (E303) is connected to the condensed water inlet pipe (c1), and the shell-side outlet of the condenser (E303) is connected to the condensed water outlet pipe (c2); the circulating water outlet (a2) is connected to the condensed water inlet pipe (c1) of the condenser (E303) through a pipeline and a small refrigerator (M201), and the condensed water outlet pipe (c2) is connected to the circulating water inlet (a1) of the carbon dioxide vaporizer (E101) through a pipeline.
2. The device for synthesizing ethylene carbonate using a heterogeneous catalyst according to claim 1, wherein: The lower end of the falling film evaporator (E301) is connected to the side line of the defoaming storage tank (E302) through a pipeline, the upper end of the defoaming storage tank (E302) is connected to the tube-side inlet of the condenser (E303) through a pipeline, the lower end of the defoaming storage tank (E302) is connected to the catalyst recovery storage tank through a pipeline, and the tube-side outlet of the condenser (E303) is connected to the product storage tank (V301) through a pipeline.
3. The device for synthesizing ethylene carbonate using a heterogeneous catalyst according to claim 2, wherein: The lower end of the catalyst storage tank (V103) is connected to the shell-side inlet of the circulation heat exchanger (E102) through a pipeline and a third feed pump (P103); the shell-side outlet of the circulation heat exchanger (E102) is connected to the lower side of the first synthesis reactor (R201) through a pipeline; the tube-side inlet of the circulation heat exchanger (E102) is connected to the circulation heating pipeline inlet (b1); and the tube-side outlet of the circulation heat exchanger (E102) is connected to the circulation heating pipeline outlet (b2).
4. The device for synthesizing ethylene carbonate using a heterogeneous catalyst according to claim 3, wherein: The lower end of the carbon dioxide storage tank (V101) is connected to the shell-side inlet of the carbon dioxide vaporizer (E101) through a pipeline and a first feed pump (P101), and the shell-side outlet of the carbon dioxide vaporizer (E101) is connected to the middle of the side line of the first synthesis reactor (R201) through a pipeline.
5. The device for synthesizing ethylene carbonate using a heterogeneous catalyst according to claim 4, wherein: The falling film evaporator (E301) comprises a falling film evaporator body (3.1), a film-hanging plate (3.2), an upper cover (3.3), a lower shell (3.4), a steam inlet pipe (3.5), a steam outlet pipe (3.6), a material inlet (3.7), and a material outlet (3.8). The upper portion of the falling film evaporator body (3.1) is provided with an upper cover (3.3), and the lower portion is provided with a lower shell (3.4). The film-hanging plates (3.2) are evenly distributed in the inner cavity of the falling film evaporator body (3.1). The material inlet (3.7) is arranged on the upper portion of the upper cover (3.3), and the material outlet (3.8) is arranged on the lower portion of the lower shell (3.4). The steam inlet pipe (3.5) is provided on the lower side of the falling film evaporator body (3.1), and the steam outlet pipe (3.6) is provided on the upper side.
6. The device for synthesizing ethylene carbonate using a heterogeneous catalyst according to claim 5, wherein: The inner cavity of the defoaming tank (E302) is filled with multiple layers of steel wire mesh for defoaming.
7. The device for synthesizing ethylene carbonate using a heterogeneous catalyst according to claim 6, wherein: The lower end of the first synthesis reactor (R201) is connected to the intermediate buffer tank (V201) through a pipeline, and the lower end of the intermediate buffer tank (V201) is connected to the pipeline at the output end of the second feed pump (P102) through a circulation pipeline (d1) and an intermediate circulation pump (P201) to form a circulation.
8. The device for synthesizing ethylene carbonate using a heterogeneous catalyst according to claim 7, wherein: Install a control valve (f1) on the circulation line (d1).