Ethylene carbonate rectification, crystallization and purification device

Abstract

The utility model relates to an ethylene carbonate rectifying, crystallizing and purifying device. According to the technical scheme, the output end of an ethylene carbonate crude product tank is connected to the side line of an ethylene carbonate rectifying tower through a pipeline, the upper side line of the rectifying tower is connected to a product storage tank through a pipeline, and the bottom of the product storage tank is connected to the top of a crystallizer through a product conveying pump and a pipeline; the middle of the crystallizer is connected to an S-grade product storage tank through a pipeline, and the bottom of the crystallizer is connected to an S-grade product tank area through an S-grade product delivery pump and a pipeline; one path of the bottom of the crystallizer is connected to the top circulation of the ethylene carbonate crystallizer through a pipeline and a crystallizer circulating pump, and the other path is connected to an ethylene carbonate mother liquor storage tank area. The device has the beneficial effects that after the original primary rectification and secondary rectification are adjusted into primary rectification and primary crystallization, not only is the quality of a purified ethylene carbonate product improved, but also the use amount of steam is reduced, and the treatment cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ethylene carbonate purification, in particular to an ethylene carbonate rectification, crystallization and purification device. Background Art

[0002] As an organic chemical raw material with excellent performance, ethylene carbonate has been mainly used in lithium battery electrolytes in recent years with high purity. It is the most widely used solvent in lithium battery electrolytes. In the future, with the development of lithium-ion power batteries, the amount of ethylene carbonate solvent will become larger and larger, and its development prospects are broad. The commonly used preparation method is: ethylene carbonate is prepared by the addition reaction of ethylene oxide and carbon dioxide. The product purification process of ethylene carbonate is mainly based on the different boiling points of the components in the product, and the first-stage distillation plus the second-stage distillation system is used for decompression separation technology. In actual application, this technology uses a large amount of steam and produces some light and heavy component waste liquid, which increases the processing cost. In order to respond to the national call for energy conservation and emission reduction and enhance the competitiveness of its own products, system innovation and upgrading are carried out. Utility Model Content

[0003] The purpose of the utility model is to provide a ethylene carbonate distillation crystallization purification device in view of the above-mentioned defects in the prior art. After adjusting the original one-stage distillation plus two-stage distillation to one-stage distillation plus one-stage crystallization, not only the product quality of the purified ethylene carbonate is improved, but also the use of steam is reduced, thereby reducing the processing cost.

[0004] The utility model discloses a ethylene carbonate distillation, crystallization and purification device, and the technical scheme thereof is as follows: comprising an ethylene carbonate distillation tower (T001), an ethylene carbonate product storage tank (V001), a product delivery pump (P001), an ethylene carbonate crystallizer (C001), a crystallizer circulation pump (P002), an S-grade product storage tank (V002), an S-grade product delivery pump (P003), an ethylene carbonate S-grade product tank area (V003), an ethylene carbonate mother liquor storage tank area (V004) and an ethylene carbonate crude product tank (V006), wherein the output end of the ethylene carbonate crude product tank (V006) is connected to the side line of the ethylene carbonate distillation tower (T001) through a pipeline, a reboiler (1) is arranged at the bottom of the ethylene carbonate distillation tower (T001), and the ethylene carbonate distillation tower (T001) is provided with a reboiler (1). The upper side line of the ethylene carbonate product storage tank (V001) is connected to the ethylene carbonate product storage tank (V001) through a pipeline, the bottom of the ethylene carbonate product storage tank (V001) is connected to the top of the ethylene carbonate crystallizer (C001) through a product delivery pump (P001) and a pipeline, and is connected to the S-grade product storage tank (V002) in the middle of the ethylene carbonate crystallizer (C001) through a pipeline, and the bottom of the S-grade product storage tank (V002) is connected to the ethylene carbonate S-grade product tank area (V003) through an S-grade product delivery pump (P003) and a pipeline; the bottom of the ethylene carbonate crystallizer (C001) is connected to the top circulation of the ethylene carbonate crystallizer (C001) through a pipeline and a crystallizer circulation pump (P002), and is connected to the ethylene carbonate mother liquor storage tank area (V004) in the other way.

[0005] Preferably, the bottom of the ethylene carbonate distillation tower (T001) is connected to a waste storage tank (V005) via a pipeline and a waste delivery pump (P004).

[0006] Preferably, the input end of the reboiler (1) is connected to the steam injection pipe (2), and the output end is connected to the steam output pipe (3).

[0007] Preferably, the upper outer wall of the ethylene carbonate crystallizer (C001) is provided with a jacket (4), and the bottom of the ethylene carbonate crystallizer (C001) is mounted on a supporting base (5).

[0008] Preferably, a first liquid level gauge (6) is installed at the bottom of the ethylene carbonate distillation tower (T001), a second liquid level gauge (7) is installed on the ethylene carbonate product storage tank (V001), and a third liquid level gauge (8) is installed on the S-grade product storage tank (V002).

[0009] Preferably, the pipeline on the output end of the above-mentioned crystallizer circulation pump (P002) is divided into two routes, one pipeline is provided with a first control valve (9), and the other pipeline is provided with a second control valve (10).

[0010] The utility model has the following beneficial effects: crude ethylene carbonate is conveyed to a first-stage ethylene carbonate distillation tower, and battery-grade ethylene carbonate products are produced after distillation in the ethylene carbonate distillation tower, and the products enter into an ethylene carbonate product storage tank for storage; then, the products are conveyed into a second-stage ethylene carbonate crystallizer through a product conveying pump, and the products are purified by an ethylene carbonate crystallization process, and the separated crude industrial-grade products are conveyed to an ethylene carbonate mother liquor storage tank area for storage through one route if they meet the requirements after chemical analysis, and conveyed to an ethylene carbonate crystallizer for continuous circulation treatment through another route of pipeline and a first control valve if they do not meet the requirements; the qualified S-grade products of crystallization enter into an S-grade product storage tank, and after being qualified in chemical analysis, they are conveyed to an ethylene carbonate S-grade product tank area for storage through an S-grade product conveying pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a structural schematic diagram of embodiment 1 of the utility model;

[0012] Figure 2 It is a structural schematic diagram of embodiment 2 of the utility model;

[0013] In the above figure: ethylene carbonate distillation tower T001, ethylene carbonate product storage tank V001, product delivery pump P001, ethylene carbonate crystallizer C001, crystallizer circulation pump P002, S-grade product storage tank V002, S-grade product delivery pump P003, waste delivery pump P004, ethylene carbonate S-grade product tank area V003, ethylene carbonate mother liquor storage tank area V004, waste storage tank V005, ethylene carbonate crude product tank V006, reboiler 1, steam injection pipe 2, steam output pipe 3, jacket 4, support base 5, first liquid level gauge 6, second liquid level gauge 7, third liquid level gauge 8, first control valve 9, second control valve 10, external valve 11. DETAILED DESCRIPTION

[0014] 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.

[0015] Example 1, reference Figure 1The utility model mentions an ethylene carbonate distillation, crystallization and purification device, comprising an ethylene carbonate distillation tower T001, an ethylene carbonate product storage tank V001, a product delivery pump P001, an ethylene carbonate crystallizer C001, a crystallizer circulation pump P002, an S-level product storage tank V002, an S-level product delivery pump P003, an ethylene carbonate S-level product tank area V003, an ethylene carbonate mother liquor storage tank area V004 and an ethylene carbonate crude product tank V006, wherein the output end of the ethylene carbonate crude product tank V006 is connected to the side line of the ethylene carbonate distillation tower T001 through a pipeline, a reboiler 1 is arranged at the bottom of the ethylene carbonate distillation tower T001, and the ethylene carbonate distillation tower T001 is provided with a reboiler 1. The upper line is connected to the ethylene carbonate product storage tank V001 through a pipeline, the bottom of the ethylene carbonate product storage tank V001 is connected to the top of the ethylene carbonate crystallizer C001 through a product delivery pump P001 and a pipeline, and is connected to the S-grade product storage tank V002 through a pipeline in the middle of the ethylene carbonate crystallizer C001, and the bottom of the S-grade product storage tank V002 is connected to the ethylene carbonate S-grade product tank area V003 through an S-grade product delivery pump P003 and a pipeline; the bottom of the ethylene carbonate crystallizer C001 is connected to the top circulation of the ethylene carbonate crystallizer C001 through a pipeline and a crystallizer circulation pump P002, and is connected to the ethylene carbonate mother liquor storage tank area V004 in the other way.

[0016] The bottom of the ethylene carbonate distillation tower T001 is connected to the waste storage tank V005 through a pipeline and a waste delivery pump P004.

[0017] The input end of the reboiler 1 is connected to a steam injection pipe 2 , and the output end is connected to a steam output pipe 3 .

[0018] The upper outer wall of the ethylene carbonate crystallizer C001 is provided with a jacket 4 , and the bottom of the ethylene carbonate crystallizer C001 is installed on a supporting base 5 .

[0019] A first liquid level gauge 6 is installed at the bottom of the ethylene carbonate distillation tower T001, a second liquid level gauge 7 is installed on the ethylene carbonate product storage tank V001, and a third liquid level gauge 8 is installed on the S-grade product storage tank V002.

[0020] The pipeline on the output end of the above-mentioned crystallizer circulation pump P002 is divided into two routes, one of which is provided with a first control valve 9, and the other is provided with a second control valve 10.

[0021] When the utility model is used, crude ethylene carbonate enters ethylene carbonate distillation tower T001 through a delivery pipeline, and battery-grade ethylene carbonate products are produced after distillation in ethylene carbonate distillation tower T001, and the products enter ethylene carbonate product storage tank V001 for storage; the ethylene carbonate in ethylene carbonate product storage tank V001 is delivered to ethylene carbonate crystallizer C001 through a product delivery pump P001, and the product is purified by ethylene carbonate crystallization process, and the separated crude industrial-grade products are delivered to ethylene carbonate mother liquor storage tank area V004 for storage through one route if they do not contain ethylene carbonate according to laboratory analysis; if they still contain ethylene carbonate, they are delivered to ethylene carbonate crystallizer C001 through another route along the pipeline and the first control valve 9 for continuous cyclic crystallization treatment; the qualified S-grade products enter S-grade product storage tank V002, and after qualified laboratory analysis, they are delivered to ethylene carbonate S-grade product tank area V003 for storage through S-grade product delivery pump P003.

[0022] Embodiment 2, the utility model mentioned a ethylene carbonate distillation crystallization purification device, comprising an ethylene carbonate distillation tower T001, an ethylene carbonate product storage tank V001, a product delivery pump P001, an ethylene carbonate crystallizer C001, a crystallizer circulation pump P002, an S-level product storage tank V002, an S-level product delivery pump P003, an ethylene carbonate S-level product tank area V003, an ethylene carbonate mother liquor storage tank area V004 and an ethylene carbonate crude product tank V006, wherein the output end of the ethylene carbonate crude product tank V006 is connected to the side line of the ethylene carbonate distillation tower T001 through a pipeline, a reboiler 1 is arranged at the bottom of the ethylene carbonate distillation tower T001, and the ethylene carbonate distillation tower T001 is provided with a reboiler 1. The upper side line of 1 is connected to ethylene carbonate product storage tank V001 through a pipeline, the bottom of ethylene carbonate product storage tank V001 is connected to the top of ethylene carbonate crystallizer C001 through a product delivery pump P001 and a pipeline, and is connected to S-grade product storage tank V002 through a pipeline in the middle of ethylene carbonate crystallizer C001, and the bottom of S-grade product storage tank V002 is connected to ethylene carbonate S-grade product tank area V003 through an S-grade product delivery pump P003 and a pipeline; the bottom of the ethylene carbonate crystallizer C001 is connected to the top circulation of ethylene carbonate crystallizer C001 through a pipeline and a crystallizer circulation pump P002, and is connected to the ethylene carbonate mother liquor storage tank area V004 in the other way.

[0023] The difference from Example 1 is:

[0024] Reference Figure 2A wall cavity is provided on the outer wall of the crude ethylene carbonate tank V006, and is connected to the upper side of the jacket 4 on the outer wall of the ethylene carbonate crystallizer C001 through a circulating water pipeline. The lower side of the jacket 4 is connected to the lower side of the wall cavity on the outer wall of the crude ethylene carbonate tank V006 through a circulating water pipeline, and an external valve 11 is provided.

[0025] In this embodiment, the circulating water heated during crystallization of the ethylene carbonate crystallizer C001 is sent to the ethylene carbonate crude product tank V006 for preheating, thereby reducing the energy consumption of the ethylene carbonate distillation tower T001, reducing production costs and improving economic benefits.

[0026] The above is only a preferred embodiment of the utility model. Any person skilled in the art may modify the utility model by using the above technical solution or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent transformation based on the technical solution of the utility model shall fall within the scope of protection claimed by the utility model.

Claims

1. An ethylene carbonate rectification, crystallization and purification device, characterized in that: Including carbonic acid An ethylene carbonate distillation tower (T001), an ethylene carbonate product storage tank (V001), a product delivery pump (P001), an ethylene carbonate crystallizer (C001), a crystallizer circulation pump (P002), an S-grade product storage tank (V002), an S-grade product delivery pump (P003), an ethylene carbonate S-grade product tank area (V003), an ethylene carbonate mother liquor storage tank area (V004) and an ethylene carbonate crude product tank (V006), wherein the output end of the ethylene carbonate crude product tank (V006) is connected to the side line of the ethylene carbonate distillation tower (T001) through a pipeline, a reboiler (1) is installed at the bottom of the ethylene carbonate distillation tower (T001), and the upper side line of the ethylene carbonate distillation tower (T001) is connected to the ethylene carbonate mother liquor storage tank area (V004) through a pipeline. The ethylene carbonate product storage tank (V001) is connected to the top of the ethylene carbonate crystallizer (C001) through a product delivery pump (P001) and a pipeline, and is connected to the S-grade product storage tank (V002) through a pipeline in the middle of the ethylene carbonate crystallizer (C001). The bottom of the S-grade product storage tank (V002) is connected to the ethylene carbonate S-grade product tank area (V003) through an S-grade product delivery pump (P003) and a pipeline; the bottom of the ethylene carbonate crystallizer (C001) is connected to the top circulation of the ethylene carbonate crystallizer (C001) through a pipeline and a crystallizer circulation pump (P002), and is connected to the ethylene carbonate mother liquor storage tank area (V004) in the other way.

2. The ethylene carbonate rectification, crystallization and purification device according to claim 1, characterized in that: The bottom of the ethylene carbonate distillation tower (T001) is connected to a waste storage tank (V005) through a pipeline and a waste transfer pump (P004).

3. The ethylene carbonate rectification, crystallization and purification device according to claim 1 or 2, characterized in that: The input end of the reboiler (1) is connected to a steam injection pipe (2), and the output end is connected to a steam output pipe (3).

4. The ethylene carbonate rectification, crystallization and purification device according to claim 3, characterized in that: The upper outer wall of the ethylene carbonate crystallizer (C001) is provided with a jacket (4), and the bottom of the ethylene carbonate crystallizer (C001) is installed on a supporting base (5).

5. The ethylene carbonate rectification, crystallization and purification device according to claim 4, characterized in that: A first liquid level gauge (6) is installed at the bottom of the ethylene carbonate distillation tower (T001), a second liquid level gauge (7) is installed on the ethylene carbonate product storage tank (V001), and a third liquid level gauge (8) is installed on the S-grade product storage tank (V002).

6. The ethylene carbonate rectification, crystallization and purification device according to claim 5, characterized in that: The pipeline on the output end of the crystallizer circulation pump (P002) is divided into two routes, one route is provided with a first control valve (9), and the other route is provided with a second control valve (10).

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