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 lower end of an ethylene carbonate crude product tank is connected to a first rectifying tower and a second rectifying tower, the top of the ethylene carbonate crude product tank is connected to a buffer storage tank through pipelines and a condenser, the buffer storage tank is connected to a crystallization kettle, the top of the crystallization kettle is connected to a light component storage tank, and the bottom of the crystallization kettle is connected to an ethylene carbonate storage tank through a pipeline; a cooling end inlet of the crystallization kettle is connected to an outlet of the refrigerator, an inlet of the refrigerator is connected with a tube pass outlet of the vaporizer, a tube pass inlet is connected with a cooling end outlet of the crystallization kettle, and the lower end of the vaporizer is connected with the liquid carbon dioxide storage tank. The method has the beneficial effects that after the crystallization process is utilized, the steam consumption can be reduced, and the discharge amount of light and heavy components in materials is reduced; the product quality can be greatly improved, and the product stability is also improved; and the cooling capacity generated during gasification of liquid carbon dioxide adopted during preparation of ethylene carbonate is fully utilized, so that the energy consumption 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] Ethylene carbonate (EC) is an excellent organic solvent that can dissolve a variety of polymers. It can also serve as an organic intermediate, replacing ethylene oxide in dioxygenation reactions and is the primary raw material for the transesterification process to produce dimethyl carbonate. It is also used as a raw material for the synthesis of furazolidone, as a water glass sizing agent, and as a fiber finishing agent. Furthermore, it is used in lithium battery electrolytes. Ethylene carbonate is also a reactive intermediate in the production of lubricating oils and greases.

[0003] At present, the purification process of ethylene carbonate in production mainly uses the different boiling points of the components in the product to perform pressure reduction separation technology on the distillation system. In actual application, this technology uses a large amount of steam and produces some light and heavy component waste liquid, which increases processing costs. 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

[0004] The purpose of the present invention is to address the above-mentioned defects in the prior art and to provide a device for the distillation, crystallization and purification of ethylene carbonate. After adjusting the original one-stage distillation plus two-stage distillation to a one-stage distillation plus one-stage crystallization, the quality of the purified ethylene carbonate product can be greatly improved, the steam usage can be reduced, and the cooling capacity generated by the gasification of liquid carbon dioxide can be fully utilized, thereby reducing energy consumption.

[0005] The utility model discloses an ethylene carbonate distillation, crystallization and purification device, the technical solution of which is as follows: comprising an ethylene carbonate crude product tank (V201), a liquid carbon dioxide storage tank (V202), a first distillation tower (T301), a second distillation tower (T302), a first condenser (C201), a second condenser (C202), a fifth condenser (C301), a first buffer storage tank (V203), a second buffer storage tank (V204), a first heavy component storage tank (V205), a second heavy component storage tank (V206) ), vaporizer (E201), refrigerator (M201), crystallizer (R301), light component storage tank (V301), ethylene carbonate storage tank (V302), the lower end of the crude ethylene carbonate tank (V201) is connected to the first distillation tower (T301) and the second distillation tower (T302) respectively through a pipeline and a first delivery pump (P201), the top of the first distillation tower (T301) is connected to the first buffer storage tank (V203) through a pipeline and a first condenser (C201), the first buffer storage tank The output end of the (V203) is connected to the crystallization kettle (R301) through a pipeline; the top of the second distillation tower (T302) is connected to the second buffer storage tank (V204) through a pipeline and the second condenser (C202), and the output end of the second buffer storage tank (V204) is connected to the crystallization kettle (R301) through a pipeline; the top of the crystallization kettle (R301) is connected to the light component storage tank (V301) through a pipeline and the fifth condenser (C301), and the bottom of the crystallization kettle (R301) is connected to the ethylene carbonate tank through a pipeline. storage tank (V302); the cooling end inlet of the crystallization kettle (R301) is connected to the outlet of the refrigerator (M201) through a pipeline, the inlet of the refrigerator (M201) is connected to the pipe-side outlet of the vaporizer (E201) through a pipeline, the pipe-side inlet of the vaporizer (E201) is connected to the cooling end outlet of the crystallization kettle (R301) through a pipeline, the lower end of the vaporizer (E201) is connected to the liquid carbon dioxide storage tank (V202) through a pipeline, and the upper end of the vaporizer (E201) is connected to the gaseous carbon dioxide pipeline (a).

[0006] Preferably, the lower end of the liquid carbon dioxide storage tank (V202) is connected to the lower end of the vaporizer (E201) through a pipeline and a second delivery pump (P202).

[0007] Preferably, the output end of the first delivery pump (P201) is divided into two pipelines, one pipeline is installed with a first control valve and connected to the first distillation tower (T301), and the other pipeline is installed with a second control valve and connected to the second distillation tower (T302).

[0008] Preferably, the output end of the first buffer storage tank (V203) is divided into two pipelines, one of which is connected to the crystallization kettle (R301) and the other is connected to the upper side of the first distillation tower (T301).

[0009] Preferably, the output end of the second buffer storage tank (V204) is divided into two pipelines, one of which is connected to the crystallization kettle (R301) and the other is connected to the upper side of the second distillation tower (T302).

[0010] Preferably, the upper end of the above-mentioned vaporizer (E201) is connected in series with a second vaporizer (E202) through a pipeline.

[0011] Preferably, a first reboiler (H201) is installed at the lower end of the first distillation tower (T301), and a second reboiler (H202) is installed at the lower end of the second distillation tower (T302).

[0012] The beneficial effects of the utility model are:

[0013] 1. Energy saving and emission reduction: The crystallization process can reduce steam usage and reduce the emission of light and heavy components in the material;

[0014] 2. Improve product quality: After the first-stage distillation, the product undergoes the first-stage crystallization, which can greatly improve the product quality and product stability;

[0015] 3. Reduce production costs: Through the one-stage distillation plus one-stage crystallization, the production cycle can be greatly shortened and the product quality can be improved. In addition, the cold energy generated by the gasification of liquid carbon dioxide used in the preparation of ethylene carbonate is fully utilized. After absorbing the cold energy generated by the vaporizer, it is sent to the refrigerator for further cooling, thereby reducing energy consumption. This not only improves product quality, but also reduces energy consumption and improves the economic benefits of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic structural diagram of Example 1 of the present utility model;

[0017] Figure 2 This is a schematic structural diagram of Example 2 of the present utility model;

[0018] In the above figure: crude ethylene carbonate tank V201, liquid carbon dioxide storage tank V202, first distillation tower T301, second distillation tower T302, first condenser C201, second condenser C202, third condenser C203, fourth condenser C204, fifth condenser C301, first buffer storage tank V203, second buffer storage tank V204, first heavy component storage tank V205, second heavy component storage tank V206, vaporizer E201, refrigerator M201, crystallization kettle R301, light component storage tank V301, ethylene carbonate storage tank V302, first delivery pump P201, second delivery pump P202, first reboiler H201, second reboiler H202, second vaporizer E202, gaseous carbon dioxide pipeline a. DETAILED DESCRIPTION

[0019] 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.

[0020] Example 1, with reference to Figure 1 The utility model mentions an ethylene carbonate distillation, crystallization and purification device, comprising an ethylene carbonate crude product tank V201, a liquid carbon dioxide storage tank V202, a first distillation tower T301, a second distillation tower T302, a first condenser C201, a second condenser C202, a fifth condenser C301, a first buffer storage tank V203, a second buffer storage tank V204, a first heavy component storage tank V205, a second heavy component storage tank V206, a vaporizer E201, a refrigerator M201, a crystallization kettle R301, a light component storage tank V301, and an ethylene carbonate storage tank V302. The lower end of the ethylene carbonate crude product tank V201 is connected to the first distillation tower T301 and the second distillation tower T302 respectively through a pipeline and a first delivery pump P201. The top of the first distillation tower T301 is connected to the first buffer storage tank V203 through a pipeline and the first condenser C201. The first buffer storage tank V203 The output end of the crystallization kettle R301 is connected to the crystallization kettle R301 through a pipeline; the top of the second distillation tower T302 is connected to the second buffer storage tank V204 through a pipeline and the second condenser C202, and the output end of the second buffer storage tank V204 is connected to the crystallization kettle R301 through a pipeline; the top of the crystallization kettle R301 is connected to the light component storage tank V301 through a pipeline and the fifth condenser C301, and the bottom of the crystallization kettle R301 is connected to the ethylene carbonate storage tank V302 through a pipeline; the cooling end inlet of the crystallization kettle R301 is connected to the outlet of the refrigerator M201 through a pipeline, the inlet of the refrigerator M201 is connected to the tube-side outlet of the vaporizer E201 through a pipeline, the tube-side inlet of the vaporizer E201 is connected to the cooling end outlet of the crystallization kettle R301 through a pipeline, the lower end of the vaporizer E201 is connected to the liquid carbon dioxide storage tank V202 through a pipeline, and the upper end of the vaporizer E201 is connected to the gaseous carbon dioxide pipeline a.

[0021] The lower end of the liquid carbon dioxide storage tank V202 is connected to the lower end of the vaporizer E201 through a pipeline and a second delivery pump P202.

[0022] The output end of the first delivery pump P201 is divided into two pipelines. One pipeline is installed with a first control valve and connected to the first distillation tower T301. The other pipeline is installed with a second control valve and connected to the second distillation tower T302.

[0023] The output end of the first buffer storage tank V203 is divided into two pipelines, one of which is connected to the crystallization kettle R301, and the other is connected to the upper side of the first distillation tower T301.

[0024] The output end of the second buffer storage tank V204 is divided into two pipelines, one of which is connected to the crystallization kettle R301, and the other is connected to the upper side of the second distillation tower T302.

[0025] A first reboiler H201 is installed at the lower end of the first distillation tower T301, and a second reboiler H202 is installed at the lower end of the second distillation tower T302.

[0026] When the utility model is used, the crude ethylene carbonate in the crude ethylene carbonate tank V201 is sent to the first distillation tower T301 for distillation through the first delivery pump P201 and the pipeline, and the tower bottom temperature, reflux ratio, liquid level, etc. of the first distillation tower T301 are controlled, and the qualified product is output and stored in the first buffer storage tank V203, a part of which is refluxed to the first distillation tower T301, and the other part is sent to the crystallization kettle R301 for crystallization purification, forming a continuous and stable production system; in addition, the second distillation tower T302 is used as a backup, or is opened synchronously when the output needs to be increased, and the operation is the same as above; in addition, the cooling capacity required by the crystallization kettle R301 can utilize the cooling capacity generated by the gasification of liquid carbon dioxide used in the preparation of ethylene carbonate. After absorbing the cooling capacity generated by the vaporizer E201, it is sent to the refrigerator M201 for further cooling, thereby reducing energy consumption, not only improving product quality, but also reducing energy consumption and improving the economic benefits of the product.

[0027] Example 2, the utility model mentioned an ethylene carbonate distillation crystallization purification device, including an ethylene carbonate crude product tank V201, a liquid carbon dioxide storage tank V202, a first distillation tower T301, a second distillation tower T302, a first condenser C201, a second condenser C202, a fifth condenser C301, a first buffer storage tank V203, a second buffer storage tank V204, a first heavy component storage tank V205, a second heavy component storage tank V206, a vaporizer E201, a refrigerator M201, a crystallization kettle R301, a light component storage tank V301, and an ethylene carbonate storage tank V302, the lower end of the ethylene carbonate crude product tank V201 is connected to the first distillation tower T301 and the second distillation tower T302 respectively through a pipeline and a first delivery pump P201, the top of the first distillation tower T301 is connected to the first buffer storage tank V203 through a pipeline and the first condenser C201, and the first buffer storage tank V204 is connected to the first heavy component storage tank V205. The output end of O3 is connected to the crystallization kettle R301 through a pipeline; the top of the second rectifying tower T302 is connected to the second buffer storage tank V204 through a pipeline and the second condenser C202, and the output end of the second buffer storage tank V204 is connected to the crystallization kettle R301 through a pipeline; the top of the crystallization kettle R301 is connected to the light component storage tank V301 through a pipeline and the fifth condenser C301, and the bottom of the crystallization kettle R301 is connected to the ethylene carbonate storage tank V302 through a pipeline; the cooling end inlet of the crystallization kettle R301 is connected to the outlet of the refrigerator M201 through a pipeline, the inlet of the refrigerator M201 is connected to the tube-side outlet of the vaporizer E201 through a pipeline, the tube-side inlet of the vaporizer E201 is connected to the cooling end outlet of the crystallization kettle R301 through a pipeline, the lower end of the vaporizer E201 is connected to the liquid carbon dioxide storage tank V202 through a pipeline, and the upper end of the vaporizer E201 is connected to the gaseous carbon dioxide pipeline a.

[0028] The difference from Example 1 is:

[0029] Reference Figure 2 In this embodiment, the upper end of the vaporizer E201 is connected in series with the second vaporizer E202 through a pipeline, so that the cold energy generated by the vaporization of liquid carbon dioxide can be fully utilized and then used to pre-cool the materials output from the first buffer storage tank V203 and the second buffer storage tank V204 through the third condenser C203 and the fourth condenser C204, thereby further reducing the consumption of cold energy and further reducing energy consumption.

[0030] 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. An ethylene carbonate rectification, crystallization and purification device, characterized by: Including carbonic acid Ethylene ester crude product tank (V201), liquid carbon dioxide storage tank (V202), first distillation tower (T301), second distillation tower (T302), first condenser (C201), second condenser (C202), fifth condenser (C301), first buffer storage tank (V203), second buffer storage tank (V204), first heavy component storage tank (V205), second heavy component storage tank (V206), vaporizer (E201), refrigerator (M201), crystallizer (R 301), a light component storage tank (V301), and an ethylene carbonate storage tank (V302). The lower end of the crude ethylene carbonate tank (V201) is connected to the first distillation tower (T301) and the second distillation tower (T302) respectively through a pipeline and a first delivery pump (P201). The top of the first distillation tower (T301) is connected to the first buffer storage tank (V203) through a pipeline and a first condenser (C201). The output end of the first buffer storage tank (V203) is connected to the junction box (V301) through a pipeline. a crystallization kettle (R301); the top of the second distillation tower (T302) is connected to the second buffer storage tank (V204) via a pipeline and a second condenser (C202); the output end of the second buffer storage tank (V204) is connected to the crystallization kettle (R301) via a pipeline; the top of the crystallization kettle (R301) is connected to the light component storage tank (V301) via a pipeline and a fifth condenser (C301); the bottom of the crystallization kettle (R301) is connected to the ethylene carbonate storage tank (V302) via a pipeline; The cooling end inlet of the crystallization kettle (R301) is connected to the outlet of the refrigerator (M201) through a pipeline, the inlet of the refrigerator (M201) is connected to the pipe-side outlet of the vaporizer (E201) through a pipeline, the pipe-side inlet of the vaporizer (E201) is connected to the cooling end outlet of the crystallization kettle (R301) through a pipeline, the lower end of the vaporizer (E201) is connected to the liquid carbon dioxide storage tank (V202) through a pipeline, and the upper end of the vaporizer (E201) is connected to the gaseous carbon dioxide pipeline (a).

2. The ethylene carbonate rectification, crystallization and purification device according to claim 1, wherein: The lower end of the liquid carbon dioxide storage tank (V202) is connected to the lower end of the vaporizer (E201) through a pipeline and a second delivery pump (P202).

3. The ethylene carbonate rectification, crystallization and purification device according to claim 2, wherein: The output end of the first delivery pump (P201) is divided into two pipelines, one pipeline is installed with a first control valve and is connected to the first distillation tower (T301), and the other pipeline is installed with a second control valve and is connected to the second distillation tower (T302).

4. The ethylene carbonate rectification, crystallization and purification device according to claim 3, wherein: The output end of the first buffer storage tank (V203) is divided into two pipelines, one of which is connected to the crystallization kettle (R301) and the other is connected to the upper side of the first distillation tower (T301).

5. The ethylene carbonate rectification, crystallization and purification device according to claim 4, wherein: The output end of the second buffer storage tank (V204) is divided into two pipelines, one of which is connected to the crystallization kettle (R301) and the other is connected to the upper side of the second distillation tower (T302).

6. The ethylene carbonate rectification, crystallization and purification device according to claim 5, wherein: The upper end of the vaporizer (E201) is connected in series with a second vaporizer (E202) via a pipeline.

7. The ethylene carbonate rectification, crystallization and purification device according to claim 5, wherein: A first reboiler (H201) is installed at the lower end of the first distillation tower (T301), and a second reboiler (H202) is installed at the lower end of the second distillation tower (T302).

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