Diethyl carbonate high temperature storage device
The diethyl carbonate storage device, which employs two-stage cooling and nitrogen control, solves the problem of diethyl carbonate decomposition under high-temperature conditions, ensuring product quality and safety during the loading process.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGYING SHIDA SHENGHUA NEW MATERIAL CO LTD
- Filing Date
- 2025-08-11
- Publication Date
- 2026-07-14
AI Technical Summary
Existing diethyl carbonate storage devices are prone to decomposition at high temperatures, leading to a decline in product quality. Furthermore, there is a lack of effective cooling measures during loading in summer, posing a risk of high-temperature decomposition.
A two-stage cooling system combined with nitrogen control is adopted. The first condenser performs primary insulation and condensation on the jacket of the diethyl carbonate storage tank, while the cryogenic exchanger rapidly condenses and cools the diethyl carbonate. Nitrogen is introduced into the storage tank to reduce air contact, and the exhaust gas is treated in an incinerator.
Effectively control the temperature inside the storage tank to avoid high-temperature decomposition, ensure product quality, solve the problem of high-temperature decomposition during summer loading, and reduce air contact and exhaust pollution.
Smart Images
Figure CN224492264U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of diethyl carbonate storage technology, and in particular to a high-temperature storage device for diethyl carbonate. Background Technology
[0002] Diethyl carbonate, a widely used chemical production intermediate, is an excellent solvent for lithium-ion battery electrolytes. At standard atmospheric pressure, it has a boiling point of 126.8℃ and a melting point of -43.0℃. It is insoluble in water but soluble in organic solvents such as alcohols and ethers. Once in the environment, diethyl carbonate can be gradually decomposed into carbon dioxide and ethanol, two substances with relatively low environmental impact, thus making it widely used in the chemical industry.
[0003] However, during the storage of diethyl carbonate, the storage tank may undergo high-temperature decomposition under high-temperature conditions, easily producing ethanol and acetic acid as byproducts, which reduces the competitiveness of diethyl carbonate in the lithium-ion battery electrolyte application market.
[0004] Our company filed a Chinese patent application in 2021, number CN202121044235.2, entitled "A Device for Improving the Stability of Diethyl Carbonate". The technical solution is as follows: the side line in the tower is connected to the inlet of the first-stage condenser via a pipeline; the outlet of the first-stage condenser is connected to the inlet of the second-stage condenser via a pipeline; the outlet of the second-stage condenser is connected to the top of the receiving tank via a pipeline; the bottom of the receiving tank is connected to the diethyl carbonate product tank via a pipeline and a first delivery pump; the outlet of the diethyl carbonate product tank is connected to the inlet of the third-stage condenser via a pipeline; and the outlet of the third-stage condenser is connected to the side line inlet of the diethyl carbonate product tank via a pipeline, thereby realizing the third-stage refrigeration cycle of the diethyl carbonate product tank. The main problem addressed by the aforementioned patent is that existing production equipment is prone to high-temperature decomposition during the discharge process and in storage equipment, leading to a decline in product quality. Therefore, the patent addresses two issues: firstly, maintaining a low temperature during the transport process from the product tower to the diethyl carbonate product tank to avoid high-temperature decomposition during discharge; secondly, cooling the diethyl carbonate product tank using a third-stage condenser. However, several problems remain: 1. It does not address the need for nitrogen injection to reduce the contact between diethyl carbonate and air during long-term storage, and the exhaust gas within the diethyl carbonate product tank is not treated; 2. It does not implement cooling measures during loading in high-temperature summer environments to prevent high-temperature decomposition and ensure the product meets customer standards; 3. The existing cooling method involves directly connecting diethyl carbonate to the third-stage condenser via pipeline for circulating cooling, pumping diethyl carbonate from the product tank to the third condenser. While this method offers good cooling effect and speed, it is costly. Utility Model Content
[0005] The purpose of this invention is to address the aforementioned deficiencies in the existing technology by providing a high-temperature storage device for diethyl carbonate. This device reduces the contact between diethyl carbonate and air by introducing controlled nitrogen gas, and the exhaust gas from the breather valve is also effectively treated, reducing the amount of air entering the device. Furthermore, by employing a two-stage cooling system, the problem of high-temperature decomposition is avoided, thus solving the problem of high-temperature decomposition during loading in high-temperature environments during summer.
[0006] The present invention discloses a high-temperature storage device for diethyl carbonate, the technical solution of which includes a diethyl carbonate storage tank (1), a circulating cooling control valve (2), a circulating cooling pipeline (3), a feeding pump (4), a cryogenic exchanger (5), a loading and unloading control valve (6), a return control valve (7), a loading platform (8), a return main pipeline (9), a nitrogen storage tank (10), a tail gas incinerator (11), a tail gas emission pipe (12), and a first condenser (13). The outer side of the diethyl carbonate storage tank (1) is provided with a jacket (1.7), and the outer side of the jacket (1.7) is connected to the first condenser (13) through pipelines and control valves for primary heat preservation and condensation. The lower side of the diethyl carbonate storage tank (1) is circulated through the circulating cooling control valve (2) and the circulating cooling pipeline (1). The cooling pipeline (3) and the feeding pump (4) are connected to the shell-side inlet of the cryogenic exchanger (5) to achieve rapid condensation and cooling of diethyl carbonate through the cryogenic exchanger (5); the shell-side outlet of the cryogenic exchanger (5) is connected to the loading platform (8) through one pipeline and the loading and unloading control valve (6), and the other pipeline is connected to the bottom right side of the diethyl carbonate storage tank (1) through the return control valve (7) and the return main pipeline (9); an oxygen content detector (1.1) and a nitrogen inlet pipeline are provided on one side of the top of the diethyl carbonate storage tank (1), and the outer end of the nitrogen inlet pipeline is connected to the nitrogen storage tank (10). A tail gas discharge pipe (12) is provided on the other side of the top of the diethyl carbonate storage tank (1), and the outer end of the tail gas discharge pipe (12) is connected to the tail gas incinerator (11).
[0007] Preferably, the oxygen content detector (1.1) is connected to the nitrogen regulating valve (1.2) installed on the nitrogen inlet pipeline via a data cable.
[0008] Preferably, a nitrogen manual valve (1.8) is connected in parallel to one side of the nitrogen regulating valve (1.2), and both ends of the nitrogen manual valve (1.8) are connected to the nitrogen inlet pipeline through pipelines.
[0009] Preferably, the exhaust pipe (12) is connected to two pipelines on the side near the diethyl carbonate storage tank (1). One pipeline is equipped with an exhaust manual valve (1.3), and the second pipeline is equipped with a breather valve (1.6). The outlet end of the breather valve (1.6) is connected to the exhaust pipe (12) through the second pipeline, and the inlet end of the breather valve (1.6) is connected to the nitrogen pressure cylinder (15) through a pipeline.
[0010] Preferably, a return branch pipeline (14) is connected in parallel to the above-mentioned return main pipeline (9), and the other end of the return branch pipeline (14) is connected to the left side of the bottom of the diethyl carbonate storage tank (1).
[0011] Preferably, a level gauge (1.4) is installed at one end of the diethyl carbonate storage tank (1), and a thermometer (1.5) is installed on the side wall of the diethyl carbonate storage tank (1).
[0012] Preferably, the above-mentioned breathing valve (1.6) includes a valve body (a1), a base (a2), an air inlet (a3), an air outlet (a4), an air inlet valve (a5), an air outlet support sleeve (a6), an upper support sleeve (a7), a top cover (a8), an air outlet valve (a9), and a gas passage (a10). The bottom of the valve body (a1) is connected to the top of the diethyl carbonate storage tank (1) through the base (a2). The valve body (a1) has an air inlet (a3) on the left side and an air outlet (a4) on the right side, with the air outlet (a4) located above the air inlet (a3). The inner cavity of the valve body (a1) is provided with an air inlet valve (a5), an air inlet support shaft (a11), an air outlet support sleeve (a6), an upper support sleeve (a7), and an air outlet valve (a9). A top cover (a8) is installed on the top of the valve body (a1).
[0013] Preferably, the upper end of the above-mentioned exhaust support sleeve (a6) is movably connected to the inner cavity of the upper support sleeve (a7), the upper end of the intake support shaft (a11) is movably connected to the lower inner cavity of the exhaust support sleeve (a6), the lower end of the intake support shaft (a11) is fixedly connected to the intake valve plate (a5), and the lower surface of the intake valve plate (a5) cooperates with the intake valve seat (a12); the lower end of the exhaust support sleeve (a6) is fixedly connected to the exhaust valve plate (a9), and the lower surface of the exhaust valve plate (a9) cooperates with the exhaust valve seat (a13).
[0014] The beneficial effects of this invention are as follows: This invention reduces the contact between diethyl carbonate and air by introducing controlled nitrogen gas, and the exhaust gas from the breather valve is also effectively treated. The input of the breather valve is also connected to a nitrogen pressure regulating cylinder, so that both the inlet and outlet of the breather valve are effectively treated, reducing the amount of air entering the tank. In addition, by adopting a two-stage cooling measure, the temperature inside the diethyl carbonate storage tank is effectively controlled, avoiding the problem of high-temperature decomposition of diethyl carbonate, and solving the problem of high-temperature decomposition during loading in high-temperature environments in summer. Attached Figure Description
[0015] Figure 1 This is a connection diagram of Embodiment 1 of this utility model;
[0016] Figure 2 This is a schematic diagram of the breather valve.
[0017] Figure 3 This is a connection diagram of Embodiment 2 of this utility model;
[0018] In the diagram above: 1. Diethyl carbonate storage tank; 2. Circulating cooling control valve; 3. Circulating cooling pipeline; 4. Feed pump; 5. Cryogenic exchanger; 6. Loading / unloading control valve; 7. Return material control valve; 8. Loading platform; 9. Return material main pipeline; 10. Nitrogen storage tank; 11. Tail gas incinerator; 12. Tail gas emission pipe; 13. First condenser; 14. Return material branch pipeline; 15. Nitrogen pressure regulating cylinder; 1.1. Oxygen content detector; 1.2. Nitrogen regulating valve; 1.3. Tail gas emission manual valve; 1.4. Liquid level gauge; 1.5. Thermometer; 1.6. Breathing valve; 1.7. Jacket; 1.8. Nitrogen manual valve.
[0019] Valve body a1, base a2, inlet end a3, outlet end a4, inlet valve plate a5, outlet support sleeve a6, upper support sleeve a7, top cover a8, outlet valve plate a9, gas passage a10, inlet support shaft a11, inlet valve seat a12, outlet valve seat a13. Detailed Implementation
[0020] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0021] Example 1, referring to Figure 1 and Figure 2This utility model discloses a high-temperature storage device for diethyl carbonate, comprising a diethyl carbonate storage tank 1, a circulating cooling control valve 2, a circulating cooling pipeline 3, a feeding pump 4, a cryogenic exchanger 5, a loading / unloading control valve 6, a return material control valve 7, a loading platform 8, a return material main pipeline 9, a nitrogen storage tank 10, a tail gas incinerator 11, a tail gas emission pipe 12, and a first condenser 13. The outer side of the diethyl carbonate storage tank 1 is provided with a jacket 1.7, which is connected to the first condenser 13 via pipelines and control valves for primary insulation and condensation. The lower side of the diethyl carbonate storage tank 1 is connected via the circulating cooling control valve 2, the circulating cooling pipeline 3, and... The feeding pump 4 is connected to the shell-side inlet of the cryogenic heat exchanger 5, which enables rapid condensation and cooling of diethyl carbonate. The shell-side outlet of the cryogenic heat exchanger 5 is connected to the loading platform 8 via one pipeline and the loading / unloading control valve 6, and to the bottom right side of the diethyl carbonate storage tank 1 via the return control valve 7 and the return main pipeline 9. An oxygen content detector 1.1 and a nitrogen inlet pipeline are installed on one side of the top of the diethyl carbonate storage tank 1. The outer end of the nitrogen inlet pipeline is connected to the nitrogen storage tank 10. A tail gas emission pipe 12 is installed on the other side of the top of the diethyl carbonate storage tank 1, and the outer end of the tail gas emission pipe 12 is connected to the tail gas incinerator 11.
[0022] The oxygen content detector 1.1 is connected to the nitrogen regulating valve 1.2 installed on the nitrogen inlet pipeline via a data cable.
[0023] A nitrogen manual valve 1.8 is connected in parallel to one side of the aforementioned nitrogen regulating valve 1.2, and both ends of the nitrogen manual valve 1.8 are connected to the nitrogen inlet pipeline via pipelines.
[0024] The exhaust pipe 12 is connected to two pipelines on the side near the diethyl carbonate storage tank 1. One pipeline is equipped with an exhaust manual valve 1.3, and the second pipeline is equipped with a breather valve 1.6. The outlet of the breather valve 1.6 is connected to the exhaust pipe 12 through the second pipeline, and the inlet of the breather valve 1.6 is connected to the nitrogen pressure cylinder 15 through a pipeline.
[0025] A level gauge 1.4 is installed at one end of the diethyl carbonate storage tank 1, and a thermometer 1.5 is installed on the side wall of the diethyl carbonate storage tank 1.
[0026] Reference Figure 2The breathing valve 1.6 mentioned in this utility model includes a valve body a1, a base a2, an inlet end a3, an outlet end a4, an inlet valve plate a5, an outlet support sleeve a6, an upper support sleeve a7, a top cover a8, an outlet valve plate a9, and a gas channel a10. The bottom of the valve body a1 is connected to the top of the diethyl carbonate storage tank 1 through the base a2. The valve body a1 has an inlet end a3 on the left side and an outlet end a4 on the right side, with the outlet end a4 located above the inlet end a3. The inner cavity of the valve body a1 is provided with an inlet valve plate a5, an inlet support shaft a11, an outlet support sleeve a6, an upper support sleeve a7, and an outlet valve plate a9. The top cover a8 is installed on the top of the valve body a1.
[0027] The upper end of the exhaust support sleeve a6 is movably connected to the inner cavity of the upper support sleeve a7, the upper end of the intake support shaft a11 is movably connected to the lower inner cavity of the exhaust support sleeve a6, the lower end of the intake support shaft a11 is fixedly connected to the intake valve plate a5, and the lower surface of the intake valve plate a5 cooperates with the intake valve seat a12; the lower end of the exhaust support sleeve a6 is fixedly connected to the exhaust valve plate a9, and the lower surface of the exhaust valve plate a9 cooperates with the exhaust valve seat a13.
[0028] In use, after diethyl carbonate is fed into the diethyl carbonate storage tank 1, especially in high-temperature environments during summer, the diethyl carbonate storage tank 1 is first cooled by the first condenser 13 to cool the condensate in the jacket, thus ensuring that the diethyl carbonate storage tank 1 is always maintained at the set temperature and avoiding high-temperature decomposition of diethyl carbonate. However, if the high temperature persists and the cooling of the diethyl carbonate storage tank 1 from the jacket cannot maintain the set temperature, the circulating cooling control valve 2 and the feeding pump 4 can be opened to cool the diethyl carbonate storage tank 1. Diethyl carbonate is directly pumped out to the cryogenic exchanger 5 outside the tank for direct cooling. The cooled diethyl carbonate is then returned to the diethyl carbonate storage tank 1, achieving rapid cooling. The frequency of pumping to the cryogenic exchanger 5 for cooling can be determined periodically or based on the temperature inside the diethyl carbonate storage tank 1, depending on the actual situation. Furthermore, during loading in high-temperature summer conditions, cooling the carbonate through the cryogenic exchanger 5 before loading onto the loading platform avoids high-temperature decomposition during transport.
[0029] In addition, the gas in the diethyl carbonate storage tank 1 of this utility model is sealed with nitrogen. The oxygen content of the gas is detected by the oxygen content detector 1.1. If it is higher than the set value, the nitrogen regulating valve 1.2 is opened, so that nitrogen is sent into the diethyl carbonate storage tank 1 through the nitrogen inlet pipeline. Of course, it can also be manually operated by controlling the nitrogen manual valve 1.8 to manually control the nitrogen to enter the diethyl carbonate storage tank 1.
[0030] Furthermore, the inlet end of the breather valve 1.6 at the top of the diethyl carbonate storage tank 1 is connected to the nitrogen pressure regulating cylinder 15 via a pipeline. When the pressure inside the tank is insufficient, nitrogen can be supplemented through the inlet end a3 instead of air, reducing the adverse effects of air entering the tank. In specific operation, the inlet valve plate a5 moves upward, causing the inlet support shaft a11 to move upward along the outlet support sleeve a6. The outlet valve plate a9 remains stationary at this time. The nitrogen from the nitrogen pressure regulating cylinder 15 enters the inner cavity of the diethyl carbonate storage tank 1 through the gap and gas passage a10 formed after the inlet valve plate a5 leaves.
[0031] Conversely, the outlet a4 of the breathing valve 1.6 is directly fed into the exhaust pipe 12 through the pipeline. In specific operation, when the pressure inside the tank is high, the inlet valve a5 remains stationary, while the outlet valve a9 is opened, causing the outlet valve a9 and the outlet support sleeve a6 to move upward. The high-pressure gas inside the tank is discharged through the gas channel a10 and the gap created by the upward movement of the outlet valve a9 and the outlet support sleeve a6, and then discharged into the exhaust gas incinerator 11 through the exhaust pipe 12, thus avoiding environmental pollution problems caused by exhaust gas discharge.
[0032] Example 2: A high-temperature diethyl carbonate storage device mentioned in this utility model includes a diethyl carbonate storage tank 1, a circulating cooling control valve 2, a circulating cooling pipeline 3, a feeding pump 4, a cryogenic heat exchanger 5, a loading / unloading control valve 6, a return material control valve 7, a loading platform 8, a return material main pipeline 9, a nitrogen storage tank 10, a tail gas incinerator 11, a tail gas emission pipe 12, and a first condenser 13. The outer side of the diethyl carbonate storage tank 1 is provided with a jacket 1.7, and the outer side of the jacket 1.7 is connected to the first condenser 13 through pipelines and control valves for primary insulation and condensation. The lower side of the diethyl carbonate storage tank 1 is connected to the circulating cooling control valve 2 and the circulating cooling pipeline... 3 and the feeding pump 4 are connected to the shell-side inlet of the cryogenic exchanger 5, which enables rapid condensation and cooling of diethyl carbonate. The shell-side outlet of the cryogenic exchanger 5 is connected to the loading platform 8 via one pipeline and the loading / unloading control valve 6, and to the bottom right side of the diethyl carbonate storage tank 1 via the return control valve 7 and the return main pipeline 9. An oxygen content detector 1.1 and a nitrogen inlet pipeline are installed on one side of the top of the diethyl carbonate storage tank 1. The outer end of the nitrogen inlet pipeline is connected to the nitrogen storage tank 10. A tail gas emission pipe 12 is installed on the other side of the top of the diethyl carbonate storage tank 1, and the outer end of the tail gas emission pipe 12 is connected to the tail gas incinerator 11.
[0033] The difference from Example 1 is:
[0034] Reference Figure 3 In this embodiment, a return branch pipeline 14 is connected in parallel to the main return pipeline 9, and the other end of the return branch pipeline 14 is connected to the left side of the bottom of the diethyl carbonate storage tank 1.
[0035] When in use, after the return branch pipeline 14 is opened, the returned and cooled diethyl carbonate will enter from both sides of the tank, which will allow the diethyl carbonate in the tank to mix and cool down more quickly, thus improving the cooling efficiency.
[0036] The above description is merely a preferred embodiment of this utility model. Any person skilled in the art may modify this utility model or modify it into an equivalent technical solution using the technical solutions described above. Therefore, any simple modifications or equivalent transformations made based on the technical solutions of this utility model are within the scope of protection claimed by this utility model.
Claims
1. A high-temperature storage device for diethyl carbonate, characterized in that: The system includes a diethyl carbonate storage tank (1), a circulating cooling control valve (2), a circulating cooling pipeline (3), a feeding pump (4), a cryogenic heat exchanger (5), a loading and unloading control valve (6), a return material control valve (7), a loading platform (8), a return material main pipeline (9), a nitrogen storage tank (10), a tail gas incinerator (11), a tail gas emission pipe (12), and a first condenser (13). The diethyl carbonate storage tank (1) has an outer jacket (1.7), which is connected to the first condenser (13) for primary insulation and condensation via pipelines and control valves. The lower side of the diethyl carbonate storage tank (1) is connected via the circulating cooling control valve (2), the circulating cooling pipeline (3), and the feeding pump (4). The shell-side inlet of the cryogenic exchanger (5) is used to rapidly condense and cool diethyl carbonate. The shell-side outlet of the cryogenic exchanger (5) is connected to the loading platform (8) via one pipeline and the loading and unloading control valve (6), and the other pipeline is connected to the bottom right side of the diethyl carbonate storage tank (1) via the return control valve (7) and the return main pipeline (9). An oxygen content detector (1.1) and a nitrogen inlet pipeline are provided on one side of the top of the diethyl carbonate storage tank (1). The outer end of the nitrogen inlet pipeline is connected to the nitrogen storage tank (10). A tail gas discharge pipe (12) is provided on the other side of the top of the diethyl carbonate storage tank (1), and the outer end of the tail gas discharge pipe (12) is connected to the tail gas incinerator (11).
2. The high-temperature storage device for diethyl carbonate according to claim 1, characterized in that: The oxygen content detector (1.1) is connected to the nitrogen regulating valve (1.2) installed on the nitrogen inlet pipeline via a data cable.
3. The high-temperature storage device for diethyl carbonate according to claim 2, characterized in that: A nitrogen manual valve (1.8) is connected in parallel to one side of the nitrogen regulating valve (1.2), and both ends of the nitrogen manual valve (1.8) are connected to the nitrogen inlet pipeline through pipelines.
4. The high-temperature storage device for diethyl carbonate according to claim 3, characterized in that: The exhaust pipe (12) is connected to two pipelines on the side near the diethyl carbonate storage tank (1). One pipeline is equipped with an exhaust manual valve (1.3), and the second pipeline is equipped with a breather valve (1.6). The outlet of the breather valve (1.6) is connected to the exhaust pipe (12) through the second pipeline, and the inlet of the breather valve (1.6) is connected to the nitrogen pressure cylinder (15) through a pipeline.
5. The high-temperature storage device for diethyl carbonate according to claim 4, characterized in that: The main return pipeline (9) is connected in parallel with a return branch pipeline (14), and the other end of the return branch pipeline (14) is connected to the left side of the bottom of the diethyl carbonate storage tank (1).
6. The high-temperature storage device for diethyl carbonate according to claim 1, 4 or 5, characterized in that: A level gauge (1.4) is installed at one end of the diethyl carbonate storage tank (1), and a thermometer (1.5) is installed on the side wall of the diethyl carbonate storage tank (1).
7. The high-temperature storage device for diethyl carbonate according to claim 4 or 5, characterized in that: The breathing valve (1.6) includes a valve body (a1), a base (a2), an inlet end (a3), an outlet end (a4), an inlet valve plate (a5), an outlet support sleeve (a6), an upper support sleeve (a7), a top cover (a8), an outlet valve plate (a9), and a gas passage (a10). The bottom of the valve body (a1) is connected to the top of the diethyl carbonate storage tank (1) through the base (a2). The valve body (a1) has an inlet end (a3) on the left side and an outlet end (a4) on the right side, with the outlet end (a4) located above the inlet end (a3). The inner cavity of the valve body (a1) is provided with an inlet valve plate (a5), an inlet support shaft (a11), an outlet support sleeve (a6), an upper support sleeve (a7), and an outlet valve plate (a9). A top cover (a8) is installed on the top of the valve body (a1).
8. The high-temperature storage device for diethyl carbonate according to claim 7, characterized in that: The upper end of the outlet support sleeve (a6) is movably connected to the inner cavity of the upper support sleeve (a7), and the upper end of the intake support shaft (a11) is movably connected to the lower inner cavity of the outlet support sleeve (a6). An intake valve plate (a5) is fixedly connected to the lower end of the intake support shaft (a11), and the lower surface of the intake valve plate (a5) cooperates with the intake valve seat (a12). An outlet valve plate (a9) is fixedly connected to the lower end of the outlet support sleeve (a6), and the lower surface of the outlet valve plate (a9) cooperates with the outlet valve seat (a13).