CN218076440U - Distillation and separation device for crude propylene carbonate - Google Patents

Abstract

The utility model relates to a propylene carbonate production device, in particular to a propylene carbonate crude product distillation and separation device. The technical solution is: the crude product tank is connected to the top of the falling film evaporator through the pipeline and the first flowmeter, the inner chamber of the falling film evaporator is equipped with a distribution and film forming device and a plurality of heat exchange tubes, the lower part is a separation chamber, and the separation The lower end of the chamber is connected to the concentrated liquid tank through a pipeline, one side of the separation chamber is connected to a rectification tower through a pipeline, and the middle and lower side lines of the rectification tower are connected to a product storage tank through a pipeline. The beneficial effect is: the beneficial effect is: the crude propylene carbonate is separated by the falling film evaporator and then enters the rectification tower, the crude product treatment efficiency is increased, the crude product processing capacity is continuously stable, and the concentration of the catalyst obtained at the bottom of the separation chamber of the falling film evaporator is stable , the temperature and pressure of the reaction system are more stable; the quality of the product obtained from the rectification tower is significantly improved, the impurities of dipropylene glycol and tripropylene glycol in the product are significantly reduced, and the quality of the propylene carbonate product reaches the battery level.

Description

Distillation and separation device for crude propylene carbonate

technical field

The utility model relates to a propylene carbonate production device, in particular to a propylene carbonate crude product distillation and separation device.

Background technique

Propylene carbonate can be used as an excellent medium for high-energy batteries and capacitors in the new energy industry. In the production process of propylene carbonate, the separation and purification of propylene carbonate are mostly carried out by thin-film evaporators and rectification towers. The traditional thin-film evaporation technology has problems such as equipment wear and sealing, vacuum leakage, and unstable operation. The decomposition of propylene carbonate and the generation of side reactions will affect the quality of the product. The operation of the rectification tower will cause the heavy components containing the catalyst to be heated repeatedly, which will increase the side reactions and increase the energy consumption while affecting the product quality. In order to effectively reduce the propylene carbonate The generation of side reactions in the process of ester separation, the improvement of product quality, the reduction of energy consumption, the improvement of operational stability, and the research and application of falling film evaporation technology.

Utility model content

The purpose of this utility model is exactly for the above-mentioned defect that prior art exists, provides a kind of propylene carbonate crude product distillation separation device, carries out the rectification of propylene carbonate by the combination of falling film evaporator and rectification tower, has improved propylene carbonate product quality.

The utility model mentions a propylene carbonate crude product distillation and separation device, and its technical scheme is: including a crude product tank (V7104), a falling film evaporator (E7302), a rectification tower (T7301), a concentrated liquid tank (V7102), The product storage tank (V7302), the crude product tank (V7104) are connected to the top of the falling film evaporator (E7302) through pipelines and the first flow meter (b1), and the inner cavity of the falling film evaporator (E7302) is equipped with Distribution and film forming device (E1) and multiple heat exchange tubes (E2), the distribution and film forming device (E1) is installed on the top of multiple heat exchange tubes (E2), and below the heat exchange tubes (E2) is Separation chamber (E5), the lower end of the separation chamber (E5) is connected to the concentrate tank (V7102) through a pipeline, and one side of the separation chamber (E5) is connected to the rectification tower (T7301) through a pipeline, the rectification tower The middle and lower side lines of (T7301) are connected to the product storage tank (V7302) through pipelines.

Preferably, the pipeline between the crude product tank (V7104) and the falling film evaporator (E7302) is provided with a parallel first control valve (a1) and a second regulating valve (a2), and a first flow meter (b1).

Preferably, the upper side of the falling film evaporator (E7302) is provided with a steam inlet (E3), and the lower side is provided with a steam outlet (E4).

Preferably, a second meter (b2) is provided on the pipeline connecting the lower end of the separation chamber (E5) to the concentrate tank (V7102).

Preferably, a third control valve (a3) is provided on the pipeline connecting the separation chamber (E5) to the rectification column (T7301).

Preferably, the bottom of the rectification tower (T7301) is connected to the crude product tank (V7104) through a pipeline and a fourth control valve (a4).

Preferably, the top of the rectification tower (T7301) is connected to the light recovery tank (V7303) through a pipeline.

The beneficial effects of the utility model are: the crude propylene carbonate is separated by the falling film evaporator and then enters the rectification tower for rectification, the processing efficiency of the crude product is increased, the processing amount of the crude product is continuously stable, and the catalyst concentration obtained at the bottom of the separation chamber of the falling film evaporator Stable, the temperature and pressure of the reaction system are more stable; the quality of the product obtained from the rectification tower is significantly improved, the impurities of dipropylene glycol and tripropylene glycol in the product are significantly reduced, and the quality of the propylene carbonate product reaches the battery level.

Description of drawings

Fig. 1 is the structural representation of embodiment 1 of the present utility model;

Fig. 2 is the structural representation of embodiment 2 of the present utility model;

Above picture: crude product tank V7104, falling film evaporator E7302, rectification tower T7301, concentrate tank V7102, product storage tank V7302, mining light tank V7303, first control valve a1, second control valve a2, third control valve a3, fourth control valve a4, production regulating valve a5, first flow meter b1, second meter b2, distribution and film forming device E1, multiple heat exchange tubes E2, steam inlet E3, steam outlet E4, separation chamber E5.

detailed description

The preferred embodiments of the present utility model are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described here are only used to illustrate and explain the present utility model, and are not intended to limit the present utility model.

Embodiment 1, with reference to Fig. 1, a kind of propylene carbonate crude product distillation separation device that the utility model mentions, comprises crude product tank V7104, falling film evaporator E7302, rectifying tower T7301, concentrated liquid tank V7102, product storage tank V7302, The crude product tank V7104 is connected to the top of the falling film evaporator E7302 through a pipeline and the first flowmeter b1, and the inner cavity of the falling film evaporator E7302 is provided with a distribution and film forming device E1 and a plurality of heat exchange tubes E2, A distribution and film-forming device E1 is provided on the top of a plurality of heat exchange tubes E2. Below the heat exchange tubes E2 is a separation chamber E5. The lower end of the separation chamber E5 is connected to the concentrate tank V7102 through a pipeline. The separation chamber E5 One side of the rectification tower T7301 is connected to the rectification tower T7301 through a pipeline, and the middle and lower side line of the rectification tower T7301 is connected to the product storage tank V7302 through a pipeline, and the negative pressure of the rectification tower T7301 maintains ≥ -97kpa.

Wherein, the pipeline between the crude product tank V7104 and the falling film evaporator E7302 is provided with a first control valve a1 and a second regulating valve a2 connected in parallel, and a first flow meter b1 is provided on the pipeline.

The upper side of the falling film evaporator E7302 is provided with a steam inlet E3, and the lower side is provided with a steam outlet E4.

Specifically, a second meter b2 is provided on the pipeline connecting the lower end of the separation chamber E5 to the concentrate tank V7102.

Specifically, a third control valve a3 is provided on the pipeline connecting the separation chamber E5 to the rectification tower T7301.

Specifically, the bottom of the rectification tower T7301 is connected to the crude product tank V7104 through a pipeline and the fourth control valve a4.

Specifically, the top of the rectification tower T7301 is connected to the light mining tank V7303 through a pipeline, and the light components are sent into the light mining tank V7303.

When the utility model is used, the crude propylene carbonate produced by the reaction in the pre-order process enters the crude product tank V7104, and the crude propylene carbonate enters the falling film after passing through the parallel first control valve a1, the second regulating valve a2 and the first flow meter b1 The top of the evaporator E7302, the distribution and film forming device E1 built in the top of the falling film evaporator evenly distributes the crude propylene carbonate to each heat exchange tube E2, and the steam enters through the steam inlet E3 on the shell side of the falling film evaporator, and passes through The steam outlet E4 at the bottom is discharged. The crude propylene carbonate liquid is heated and vaporized by the heating steam. The generated steam and liquid phase enter the separation chamber E5 of the evaporator together. The propylene carbonate gas phase contains a small amount of catalyst and quickly enters the rectification tower under the action of negative pressure. T7301, the negative pressure of the rectification tower T7301 is maintained ≥ -97kpa, and the rectification operation of the rectification tower T7301 is maintained. The battery-grade propylene carbonate with a content of ≥99.99% mined in the rectification tower T7301 is sent to the product storage tank V7302; rectification The catalyst-containing material in the kettle of the tower T7301 returns to the crude product tank V7104 through the pipeline and the fourth control valve a4, and then enters the falling film evaporator E7302 for recycling; At the bottom of the chamber, the liquid level is measured by the second meter b2, and the catalyst continuously enters the reaction section to participate in the reaction. After the utility model is applied, the quality of the product obtained after rectification from the rectification tower is significantly improved, the impurities of dipropylene glycol and tripropylene glycol in the product are significantly reduced, and the quality of the propylene carbonate product reaches the battery level.

Embodiment 2, with reference to Fig. 2, a kind of propylene carbonate crude product distillation separation device that the utility model mentions, comprises crude product tank V7104, falling film evaporator E7302, rectifying tower T7301, concentrated liquid tank V7102, product storage tank V7302, The crude product tank V7104 is connected to the top of the falling film evaporator E7302 through a pipeline and the first flowmeter b1, and the inner cavity of the falling film evaporator E7302 is provided with a distribution and film forming device E1 and a plurality of heat exchange tubes E2, A distribution and film-forming device E1 is provided on the top of a plurality of heat exchange tubes E2. Below the heat exchange tubes E2 is a separation chamber E5. The lower end of the separation chamber E5 is connected to the concentrate tank V7102 through a pipeline. The separation chamber E5 One side of the rectification tower T7301 is connected to the rectification tower T7301 through a pipeline, and the middle and lower side line of the rectification tower T7301 is connected to the product storage tank V7302 through a pipeline; the lower end of the separation chamber E5 is connected to the pipeline of the concentrate tank V7102, and a second metering Count b2.

The difference from Example 1 is:

A production regulating valve a5 is also provided on the upper pipeline of the second meter b2, through which the liquid level in the separation chamber E5 can be controlled to be stable.

The above are only preferred embodiments of the present utility model, and any person skilled in the art may use the above-mentioned technical solutions to modify the present utility model or modify it into an equivalent technical solution. Therefore, any simple modification or equivalent transformation carried out according to the technical solution of the utility model belongs to the protection scope of the utility model.

Claims (7)

1. A propylene carbonate crude product distillation separator, characterized by: the device comprises a crude product tank (V7104), a falling film evaporator (E7302), a rectifying tower (T7301), a concentrated solution tank (V7102) and a product storage tank (V7302), wherein the crude product tank (V7104) is connected to the top of the falling film evaporator (E7302) through a pipeline and a first flow meter (b 1), a distribution and film forming device (E1) and a plurality of heat exchange tubes (E2) are arranged in the inner cavity of the falling film evaporator (E7302), a distribution and film forming device (E1) is arranged at the top of the heat exchange tubes (E2), a separation cavity (E5) is arranged below the heat exchange tubes (E2), the lower end of the separation cavity (E5) is connected to the concentrated solution tank (V7102) through a pipeline, one side of the separation cavity (E5) is connected to the rectifying tower (T7301) through a pipeline, and the middle lower side line of the rectifying tower (T7301) is connected to the product storage tank (V7302) through a pipeline.

2. The distillation separation device for the crude propylene carbonate product as claimed in claim 1, which is characterized in that: a first control valve (a 1) and a second regulating valve (a 2) which are connected in parallel are arranged on a pipeline between the crude product tank (V7104) and the falling film evaporator (E7302), and a first flow meter (b 1) is arranged on the pipeline.

3. The distillation separation device for the crude propylene carbonate product as claimed in claim 2, which is characterized in that: the upper side of the falling-film evaporator (E7302) is provided with a steam inlet (E3), and the lower side is provided with a steam outlet (E4).

4. The distillation and separation device for the crude propylene carbonate product as claimed in claim 3, which is characterized in that: a second meter (b 2) is arranged on a pipeline connecting the lower end of the separation cavity (E5) to the concentrated solution tank (V7102).

5. The distillation separation device for the crude propylene carbonate product as claimed in claim 4, which is characterized in that: a third control valve (a 3) is arranged on a pipeline of the separation cavity (E5) connected to the rectifying tower (T7301).

6. The distillation and separation device for the crude propylene carbonate product as claimed in claim 1 or 5, which is characterized in that: the bottom of the rectification column (T7301) was connected to the crude tank (V7104) through a line and a fourth control valve (a 4).

7. The distillation and separation device for the crude propylene carbonate product as claimed in claim 6, which is characterized in that: the top of the rectifying tower (T7301) is connected with a light-ends extraction tank (V7303) through a pipeline.

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