Device and method for preparing electronic ethylene carbonate by coupling crystallization with rectification
A technology coupled with ethylene carbonate and rectification, which is applied in the field of preparation of electronic grade reagents, can solve problems such as difficult balance between product purity and yield, unfavorable lithium-ion battery electrolyte, and poor lithium-ion battery, so as to ensure production operation Efficiency, high product purity, and easy maintenance
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Example Embodiment
[0057] Example 1
[0058] Such as figure 1 As shown, this embodiment provides a device for preparing electronic grade ethylene carbonate by coupling crystallization and rectification, which includes a raw material storage tank 1, a falling film crystallizer 2, a rectification tower 3, a first product tank 4, a transition tank 5 and The second product tank 6.
[0059] The connection relationship of each device is:
[0060] The raw material storage tank 1 is connected to the feed port 201 of the falling film crystallizer 2 through a feed line 11, a discharge main pipe 21 is provided at the discharge port 202 of the falling film crystallizer 2, and the end of the discharge main pipe 21 is connected to a circulating pipeline 31. The first product pipeline 41 and the transition pipeline 51, the circulation pipeline 31 is connected to the feed port 201 of the falling film crystallizer 2, the first product pipeline 41 is connected to the first product tank 4, and the transition pipeline 51...
Example Embodiment
[0079] Example 2
[0080] This embodiment provides a method for preparing electronic grade ethylene carbonate by coupling crystallization and distillation, which includes a crystallization process and a rectification process. The crystallization process includes the following steps:
[0081] Crystallization: The ethylene carbonate material to be purified is transported from the raw material storage tank 1 to the falling film crystallizer 2. The material enters the falling film crystallizer 2 and flows through the falling film in the crystallization tube. The temperature of the cooling medium is adjusted to make the material in Crystallize in the crystallization tube and stop feeding when the crystal layer reaches a certain thickness;
[0082] Sweat: Then gradually increase the temperature of the cooling medium to make the crystal layer sweat, and drain the sweat residue into the transition tank 5;
[0083] Crystal melting: After the sweating is over, the temperature of the cooling med...
Example Embodiment
[0093] Example 3
[0094] The difference from Example 2 is the operating conditions of the crystallization process and the operating conditions of the rectification process, and the rest are the same as in Example 2.
[0095] In this embodiment, the operating conditions of the crystallization process are:
[0096] The feed flow rate of ethylene carbonate is 200L / h, and the feed temperature is 42°C;
[0097] In the falling film crystallization process, the cooling step is 1.5°C / h, the crystallization time is 6h, and the end temperature of the cooling crystallization is 33°C, followed by constant temperature, and the constant temperature time is 2h;
[0098] In the process of sweating, the heating step is 3℃ / h, the sweating time is 3h, and the end temperature of sweating is 37℃;
[0099] The temperature during crystal melting is 45°C.
[0100] The operating conditions of the distillation process are:
[0101] It adopts vacuum distillation operation, the pressure inside the tower is 2.0kPa, t...
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