CN216571615U

CN216571615U - Ethylene carbonate continuous rectification system

Info

Publication number: CN216571615U
Application number: CN202123295030.4U
Authority: CN
Inventors: 马文平; 李新; 杨晓; 徐海龙; 史海涛; 马尊泽
Original assignee: Shida Shenghua Quanzhou Co ltd
Current assignee: Shida Shenghua Quanzhou Co ltd
Priority date: 2021-12-24
Filing date: 2021-12-24
Publication date: 2022-05-24
Anticipated expiration: 2031-12-24

Abstract

The utility model relates to a chemical production equipment technical field specifically is a continuous rectification system of ethylene carbonate. This kind of ethylene carbonate continuous rectification system, including one-level rectifier unit, second grade rectifier unit, continuous conveyer pipe, one-level rectifier unit includes the one-level rectifying column of negative pressure, second grade rectifier unit includes that the negative pressure degree is greater than the second grade rectifying column of one-level rectifying column, one-level rectifying column and second grade rectifying column middle part are through duct connections in succession for send into the second grade rectifying column in succession with the ethylene carbonate of extracting in the one-level rectifying column. The utility model discloses a continuous rectification system of ethylene carbonate utilizes one-level rectifying column, the second grade rectifying column of different negative pressure degrees, with the highest material of one-level rectifying column middle part product content as the product extraction, sends into the second grade rectifying column and carries out the rectification purification to the product, realizes carrying out continuous extraction to distillate in the second grade rectifying column tower, and then obtains stable, qualified ethylene carbonate.

Description

Ethylene carbonate continuous rectification system

Technical Field

The utility model relates to a chemical production equipment technical field specifically is a continuous rectification system of ethylene carbonate.

Background

Ethylene carbonate, also known as 1, 3-dioxolane-2-one, has a molecular formula of C3H4O3, abbreviated as EC, is an organic solvent with excellent performance, can dissolve various polymers, and has a plurality of excellent properties. High-purity ethylene carbonate is also mainly applied to lithium battery electrolytes. The solvent is the solvent with the largest usage amount in the lithium battery electrolyte, and the usage amount of the ethylene carbonate solvent is larger and larger along with the development of the soft package power battery in the future, so that the development prospect is wide, but the requirement on the product quality is naturally higher and higher.

In the production process of the ethylene carbonate, in order to obtain high-purity ethylene carbonate, crude ethylene carbonate and part of impurities need to be rectified. Rectification is a distillation method for separating a liquid mixture with high purity by utilizing reflux, is the most widely applied liquid mixture separation operation in industry, and is widely applied to companies such as petroleum, chemical engineering and the like. The rectification operations are classified in different ways. According to the operation mode, the method can be divided into continuous rectification and batch rectification.

The purity of the prior crude ethylene carbonate product is 99.0-99.5%, and the impurities are low-boiling-point substances such as ethylene oxide, carbon dioxide, ethylene glycol and the like. The intermittent rectification method can not stably obtain high-purity ethylene carbonate, so that the purity of the ethylene carbonate can be further improved, and the high-purity ethylene carbonate can be obtained, and the method becomes one of the focuses of extensive scientific research personnel in the field.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a continuous rectification system of ethylene carbonate to solve the problem that proposes among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a continuous rectification system of ethylene carbonate, includes one-level rectifier unit, second grade rectifier unit, conveyer pipe in succession, one-level rectifier unit includes the one-level rectifying column of negative pressure, second grade rectifier unit includes that the negative pressure degree is greater than the second grade rectifying column of one-level rectifying column, one-level rectifying column and second grade rectifying column middle part are through duct connections in succession for send into the second grade rectifying column in succession with the ethylene carbonate of extracting in the one-level rectifying column.

Furthermore, the first-stage rectifying tower is a first-stage rectifying tower with the vacuum degree of 0.08-0.09 Mpa.

Furthermore, the secondary rectifying tower is a secondary rectifying tower with the vacuum degree of 0.09MPa-1.03 MPa.

Further, one-level rectifier unit still includes one-level condenser and one-level reflux unit, one-level condenser one end is connected with one-level rectifying column top gas phase export, and the other end is connected with one-level rectifying column, one-level reflux unit is connected with one-level rectifying column liquid phase import.

Further, one-level reflux unit includes one-level return line, one-level backward flow jar and one-level backwash pump are connected on one-level return line.

Further, one-level rectifier unit still includes one-level circulating pipe, one-level tower cauldron reboiler, one-level discharge pump, one-level circulating pipe one end is connected with one-level rectifier tower cauldron gas phase import, one-level tower cauldron reboiler is connected on one-level circulating pipe, one-level discharge pump is connected with one-level circulating pipe and is arranged in discharging the heavy ends raffinate among the circulating line.

And one end of the second-stage condenser is connected with a gas phase outlet at the top of the second-stage rectifying tower, the other end of the second-stage condenser is connected with the second-stage reflux device, and the second-stage reflux device is connected with a liquid phase inlet of the first-stage rectifying tower.

Further, second grade reflux unit includes second grade return line, second grade return tank and second grade backwash pump are connected on second grade return line.

Further, the secondary rectification device further comprises a secondary circulating pipe, a secondary tower kettle reboiler and a secondary discharge pump, one end of the secondary circulating pipe is connected with a gas phase inlet of the tower kettle of the secondary rectification tower, the secondary tower kettle reboiler is connected onto the secondary circulating pipe, and the secondary discharge pump is connected with the secondary circulating pipe and used for discharging heavy component residual liquid in the circulating pipeline.

Further, the second-stage discharge pump is connected with the first-stage rectifying tower liquid through a liquid discharge pipeline.

Compared with the prior art, the utility model discloses a continuous rectification system of ethylene carbonate utilizes the one-level rectifying column of different negative pressure degrees, the second grade rectifying column, with the highest material of one-level rectifying column middle part product content as the product extraction, send into the second grade rectifying column and carry out the rectification purification to the product, the volatility of impurity under different vacuums in the product that generates through the reaction is different, can be with the principle of low boiling impurity separation under vacuum condition, the realization is carried out continuous extraction to distillate in the second grade rectifying column tower, and then obtain stably, qualified ethylene carbonate.

Drawings

FIG. 1 is a schematic structural diagram of a continuous rectification system for ethylene carbonate according to the present invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, rather than all embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention.

Referring to fig. 1, the present invention provides a technical solution:

a continuous rectification system for ethylene carbonate comprises a primary rectification device 1, a secondary rectification device 2 and a continuous conveying pipe 3;

the primary rectifying device 1 comprises a negative pressure primary rectifying tower 11, a primary condenser 12, a primary reflux device 13, a primary circulating pipe 14, a primary tower kettle reboiler 15 and a primary discharging pump 16, wherein the primary rectifying tower 11 is a primary rectifying tower with the vacuum degree of 0.08-0.09Mpa, one end of the primary condenser 12 is connected with the top gas phase outlet of the primary rectifying tower 11, the other end is connected with the primary rectifying tower 11, the first-stage reflux device 13 is connected with the liquid phase inlet of the first-stage rectifying tower 11, the first-stage reflux device 13 comprises a first-stage reflux pipeline 131, a first-stage reflux tank 132 and a first-stage reflux pump 133, the first-stage reflux tank 132 and the first-stage reflux pump 133 are connected to the first-stage reflux pipeline 131, one end of the first-stage circulating pipe 14 is connected to the gas phase inlet of the tower bottom of the first-stage rectifying tower 11, the primary tower kettle reboiler 15 is connected to a primary circulating pipe 14, and the primary discharge pump 16 is connected with the primary circulating pipe 14 and used for discharging heavy component residual liquid in the primary circulating pipe 14;

the second-stage rectifying device 2 comprises a second-stage rectifying tower 21, a second-stage condenser 22, a second-stage reflux device 23, a second-stage circulating pipe 24, a second-stage tower kettle reboiler 25, a second-stage discharging pump 26 and a liquid discharging pipeline 27, wherein the second-stage rectifying tower 21 and the second-stage rectifying tower are in a vacuum degree of 0.09-1.03Mpa, one end of the second-stage condenser 22 is connected with a gas phase outlet at the top of the second-stage rectifying tower 21, the other end of the second-stage condenser 22 is connected with the second-stage reflux device 23, the second-stage reflux device 23 is connected with a liquid phase inlet of the first-stage rectifying tower 21, the second-stage reflux device 23 comprises a second-stage reflux pipe 231, a second-stage reflux tank 232 and a second-stage reflux pump 233, the second-stage reflux tank 232 and the second-stage reflux pump 233 are connected onto the second-stage reflux pipe 231, one end of the second-stage circulating pipe 24 is connected with a gas phase inlet at the bottom of the second-stage rectifying tower 21, the second-stage tower kettle reboiler 25 is connected onto the second-stage circulating pipe 24, and the second-stage discharging pump 26 introduces heavy components in the second-stage circulating pipe 24 into the first-stage rectifying tower liquid 11 through the liquid discharging pipeline 27 Performing the following steps;

the continuous conveying pipe 3 is used for communicating the middle part of the first-stage rectifying tower 11 with the middle part of the second-stage rectifying tower 21 and continuously conveying the ethylene carbonate extracted from the middle part of the first-stage rectifying tower 11 into the second-stage rectifying tower for secondary distillation.

Referring to fig. 1, the utility model discloses a continuous rectification system of ethylene carbonate, the work flow is as follows:

the product (ethylene carbonate) generated by the reaction is sent to the middle part of a first-stage rectifying tower 11 through a pump, the bottom boiling point substances such as ethylene glycol, carbon dioxide, ethylene oxide and the like are removed by the continuous negative pressure rectification of the first-stage rectifying tower under the conditions of 0.08-0.09Mpa and the temperature of 120-;

the ultra-pure ethylene carbonate semi-finished product is sent into a secondary rectifying tower 21 through a continuous conveying pipe 3, high boiling point impurities are removed by negative pressure continuous rectification under the conditions that the vacuum degree of the secondary rectifying tower 21 is 0.09-1.03Mpa and the temperature is 130 ℃ + 150 ℃, light impurities and ethylene carbonate continuously extracted from the tower top sequentially pass through a mixture of a secondary condenser 22 and a secondary reflux device 23 and enter a primary rectifying tower 11, heavy impurities and ethylene carbonate extracted from the tower bottom of the secondary rectifying tower 21 enter the primary rectifying tower 11 through a mixture of a drainage pipeline 27, and high-purity ethylene carbonate finished product is continuously extracted from the secondary rectifying tower 21.

The utility model discloses a continuous rectifying system of ethylene carbonate utilizes the one-level rectifying column 11 of different negative pressure degrees, second grade rectifying column 12, with the highest material of one-level rectifying column 11 middle part product content as the product extraction, send into second grade rectifying column 12 and carry out the rectification purification to the product, the impurity in the result that generates through the reaction is different at the volatility under the different vacuums, can be with the principle of low boiling impurity separation under the vacuum condition, the realization is carried out continuous extraction to distillate in second grade rectifying column 12 tower, and then obtain stable, qualified ethylene carbonate.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A continuous rectification system for ethylene carbonate is characterized in that: including one-level rectifier unit, second grade rectifier unit, continuous conveyer pipe, one-level rectifier unit includes the one-level rectifying column of negative pressure, second grade rectifier unit includes that the negative pressure degree is greater than the second grade rectifying column of one-level rectifying column, one-level rectifying column and second grade rectifying column middle part are through continuous duct connection for send into second grade rectifying column in succession with the ethylene carbonate of gathering in the one-level rectifying column.

2. The ethylene carbonate continuous rectification system according to claim 1, characterized in that: the first-stage rectifying tower is a first-stage rectifying tower with the vacuum degree of 0.08-0.09 Mpa.

3. The ethylene carbonate continuous rectification system according to claim 2, characterized in that: the second-stage rectifying tower is a second-stage rectifying tower with the vacuum degree of 0.09MPa-1.03 MPa.

4. The ethylene carbonate continuous rectification system according to claim 1, characterized in that: the primary rectifying device further comprises a primary condenser and a primary reflux device, one end of the primary condenser is connected with a gas phase outlet at the top of the primary rectifying tower, the other end of the primary condenser is connected with the primary rectifying tower, and the primary reflux device is connected with a liquid phase inlet of the primary rectifying tower.

5. The ethylene carbonate continuous rectification system according to claim 4, characterized in that: the first-stage backflow device comprises a first-stage backflow pipeline, a first-stage backflow tank and a first-stage backflow pump, and the first-stage backflow tank and the first-stage backflow pump are connected to the first-stage backflow pipeline.

6. The ethylene carbonate continuous rectification system according to claim 1, characterized in that: the first-stage rectifying device further comprises a first-stage circulating pipe, a first-stage tower kettle reboiler and a first-stage discharging pump, one end of the first-stage circulating pipe is connected with a gas phase inlet of the first-stage rectifying tower kettle, the first-stage tower kettle reboiler is connected onto the first-stage circulating pipe, and the first-stage discharging pump is connected with the first-stage circulating pipe and used for discharging heavy component residual liquid in a circulating pipeline.

7. The ethylene carbonate continuous rectification system according to claim 1, characterized in that: the device comprises a first-stage rectifying tower, a second-stage rectifying tower, a first-stage reflux device, a second-stage condenser and a second-stage reflux device, wherein the first-stage rectifying tower is connected with a tower top gas phase outlet of the first-stage rectifying tower, the second-stage reflux device is connected with a tower top gas phase outlet of the second-stage rectifying tower, the other end of the second-stage condenser is connected with the second-stage reflux device, and the second-stage reflux device is connected with a liquid phase inlet of the first-stage rectifying tower.

8. The ethylene carbonate continuous rectification system according to claim 7, wherein: the second-stage reflux device comprises a second-stage reflux pipeline, a second-stage reflux tank and a second-stage reflux pump, and the second-stage reflux tank and the second-stage reflux pump are connected to the second-stage reflux pipeline.

9. The ethylene carbonate continuous rectification system according to claim 1, characterized in that: the secondary rectifying device further comprises a secondary circulating pipe, a secondary tower kettle reboiler and a secondary discharging pump, one end of the secondary circulating pipe is connected with a gas phase inlet of the tower kettle of the secondary rectifying tower, the secondary tower kettle reboiler is connected onto the secondary circulating pipe, and the secondary discharging pump is connected with the secondary circulating pipe and used for discharging heavy component residual liquid in a circulating pipeline.

10. The ethylene carbonate continuous rectification system according to claim 8, wherein: the second-stage discharge pump is connected with the first-stage rectifying tower liquid through a liquid discharge pipeline.