Propylene carbonate crude product falling film evaporation device
By installing a square packing layer and distribution plate inside the falling film evaporator, and combining it with the high-temperature heat from the heat exchanger for reheating, the problem of uneven liquid phase distribution is solved, heat exchange efficiency is improved and energy consumption is reduced, meeting the production needs of different processes.
Patent Information
- Application Number
- CN202423011016.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-06
- Publication Date
- 2025-11-07
- Estimated Expiration
- 2034-12-06
AI Technical Summary
Existing falling film evaporators suffer from uneven liquid phase distribution during the feeding process, resulting in poor heat exchange performance, which limits the processing efficiency and product quality of the distillation column, while also consuming a large amount of energy.
A square packing layer is installed inside the falling film evaporator, and a primary distribution plate and a secondary distribution plate are installed inside it. The high temperature heat from the propylene carbonate reactor is used to reheat the crude propylene carbonate in the distillation column through a heat exchanger. A second falling film evaporator is added to meet different process requirements.
This method achieves uniform distribution of crude propylene carbonate, improves heat exchange efficiency, saves energy, and meets the needs of different production processes.
Smart Images
Figure CN223516943U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to carbonic acid propylene ester rectification technical field, especially a kind of carbonic acid propylene ester crude product falling film evaporator. BACKGROUND
[0002] Carbonic acid propylene ester is a kind of colorless and odorless flammable liquid, electronic industry can be used as high-energy battery and capacitor excellent medium. Carbonic acid propylene ester production is divided into reaction process and rectification process, wherein, reaction process is synthesized by propylene oxide and carbon dioxide, and the crude product carbonic acid propylene ester after reaction is obtained battery-grade carbonic acid propylene ester by rectification. And falling film evaporator is used in rectification system to improve the evaporation efficiency of crude product, but the liquid phase of existing falling film evaporator is unevenly distributed in the process of feeding, so that falling film evaporator does not achieve the desired heat exchange effect, limits the processing efficiency and product quality of rectification tower. Moreover, the existing rectification system has high energy consumption. UTILITY MODEL CONTENT
[0003] The utility model aims at the above-mentioned defects existing in prior art, provide a kind of carbonic acid propylene ester crude product falling film evaporator, one aspect is by using the high-temperature heat of carbonic acid propylene ester reactor, the carbonic acid propylene ester crude product in rectification tower is reheated by heat exchanger, and energy consumption is greatly saved. Another aspect is to install square packing layer in falling film evaporator, and install primary distribution disc and secondary distribution disc in square packing layer, so that the feed medium is evenly distributed in falling film evaporator, and the heat exchange efficiency of falling film evaporator is improved.
[0004] The utility model discloses a kind of propylene carbonate crude product falling film evaporator, its technical scheme is: including propylene carbonate reactor (T201), propylene carbonate crude product storage tank (V201), heat exchanger (E201), feed pump (P201), first falling film evaporator (MVR201), rectifying tower (T301), rectifying tower (T301), light product storage tank (V301), product storage tank (V302), the side line outlet of propylene carbonate reactor (T201) is connected by pipeline propylene carbonate crude product storage tank (V201), the lower end of propylene carbonate crude product storage tank (V201) is connected by pipeline first falling film evaporator (MVR201), and the output end of first falling film evaporator (MVR201) is connected by pipeline the side line import of rectifying tower (T301);The bottom of propylene carbonate reactor (T201) is connected by pipeline the shell side import of heat exchanger (E201), and the shell side export of heat exchanger (E201) is connected by pipeline and feed pump (P201) to the top end of propylene carbonate reactor (T201);The pipe side import of heat exchanger (E201) is connected by pipeline the upper side of rectifying tower (T301), and the lower side of rectifying tower (T301) is connected by pipeline the pipe side export of heat exchanger (E201);The upper side of rectifying tower (T301) is connected by pipeline light product storage tank (V301), and the lower side of rectifying tower (T301) is connected by pipeline product storage tank (V302).
[0005] Preferably, the top of the rectifying tower (T301) is connected by pipeline to the pipe side import of the second heat exchanger (E202), the pipe side export of the second heat exchanger (E202) is connected by pipeline to the circulating storage tank (V202), and the lower end of the circulating storage tank (V202) is connected by pipeline and the circulating pump (P202) to the upper side of the rectifying tower (T301).
[0006] Preferably, the bottom of the rectifying tower (T301) is provided with a reboiler (H301).
[0007] Preferably, the first falling film evaporator (MVR201) is provided with a first feed pipe (L1) connected in parallel between the lower end and the upper end of the first falling film evaporator (MVR201), and a first control valve (J1) is installed on the first feed pipe (L1).
[0008] Preferably, the lower end of the first falling film evaporator (MVR201) is connected to a second feed pipe (L2), and a second control valve (J2) is installed on the second feed pipe (L2).
[0009] Preferably, the lower end of the first falling film evaporator (MVR201) is connected to a third feed pipe (L3) in parallel, and a third control valve (J3) and a second falling film evaporator (MVR202) are installed on the third feed pipe (L3), and the upper end of the second falling film evaporator (MVR202) is connected by pipeline to the rectifying tower (T301).
[0010] Preferably, the lower head (a1) and the heat exchange tube bundle (a3) of the first falling film evaporator (MVR201) and the second falling film evaporator (MVR202) are respectively provided with square packing layers (a2), and a first distribution plate (a4) and a second distribution plate (a5) are arranged in the square packing layers (a2).
[0011] Preferably, the first distribution plate (a4) and the second distribution plate (a5) are respectively provided with small holes.
[0012] The utility model discloses the high temperature heat of propylene carbonate reactor, through heat exchanger to the crude product of propylene carbonate in rectifying tower is reheated again, and the energy consumption is saved greatly, in addition, through the second falling film evaporator that has added, can adjust to two groups falling film evaporation simultaneously according to the production need of scene, satisfies the different process needs of scene, still, because the square packing layer is installed respectively in the lower head and the heat exchange tube bundle of the first falling film evaporator and the second falling film evaporator, and the first distribution plate and the second distribution plate are arranged in the square packing layer, so that the feed medium is evenly distributed in the falling film evaporator, avoids the flow of feed crude product, so that the feed medium can be evenly distributed to all heat exchange tube bundles, and the heat exchange efficiency of falling film evaporator is improved. BRIEF DESCRIPTION OF DRAWINGS
[0013] Figure 1 It is the connection schematic drawing of embodiment 1 of the utility model;
[0014] Figure 2 It is the connection schematic drawing of embodiment 2 of the utility model;
[0015] Figure 3 It is the local structure schematic drawing of first falling film evaporator;
[0016] Figure 4 It is the A-A cross section schematic drawing of Figure 3 ;
[0017] Figure 5 It is the B-B cross section schematic drawing of Figure 3 ;
[0018] In the above figure: propylene carbonate reactor T201, propylene carbonate crude product storage tank V201, heat exchanger E201, feed pump P201, first falling film evaporator MVR201, second falling film evaporator MVR202, rectifying tower T301, second heat exchanger E202, circulating tank V202, circulating pump P202, rectifying tower T301, light component storage tank V301, product storage tank V302, reboiler H301, first feed pipe L1, second feed pipe L2, third feed pipe L3, first control valve J1, second control valve J2, third control valve J3, lower head a1, square filler layer a2, heat exchange tube bundle a3, primary distribution disc a4 and secondary distribution disc a5. DETAILED DESCRIPTION
[0019] The preferred embodiments of the present application are described below with reference to the accompanying drawings, and it should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application, and are not used to limit the present application.
[0020] Example 1, refer to Figure 1 The propylene carbonate crude falling film evaporation device provided by the present application comprises a propylene carbonate reactor T201, a propylene carbonate crude product storage tank V201, a heat exchanger E201, a feed pump P201, a first falling film evaporator MVR201, a rectifying tower T301, a light component storage tank V301 and a product storage tank V302.
[0021] The top of the rectifying tower T301 is connected to the tube inlet of the second heat exchanger E202 through a pipeline, and the tube outlet of the second heat exchanger E202 is connected to the circulating tank V202 through a pipeline.
[0022] The bottom of the rectifying tower T301 is provided with a reboiler H301.
[0023] The lower end and the upper end of the first falling film evaporator MVR201 are connected in parallel with the first material conveying pipe L1, and the first control valve J1 is installed on the first material conveying pipe L1.
[0024] The lower end of the first falling film evaporator MVR201 is connected with the second material conveying pipe L2, and the second control valve J2 is installed on the second material conveying pipe L2.
[0025] Referring to Figure 3 and Figure 4 The lower head a1 and the heat exchange pipe bundle a3 of the first falling film evaporator MVR201 are respectively provided with the square packing layer a2, the first distribution disc a4 and the second distribution disc a5 are arranged in the square packing layer a2, and the first distribution disc a4 and the second distribution disc a5 are respectively provided with small holes.
[0026] When the utility model is used,
[0027] The propylene carbonate crude product synthesized by the propylene carbonate reactor T201 is sent to the propylene carbonate crude product storage tank V201, and then is sent to the first falling film evaporator MVR201 for falling film evaporation. Since the square packing layer a2 is respectively installed at the lower head a1 and the heat exchange pipe bundle a3 of the first falling film evaporator MVR201, and the first distribution disc a4 and the second distribution disc a5 are arranged in the square packing layer a2, the feeding medium is uniformly distributed in the falling film evaporator, and the feeding crude product is prevented from flowing unevenly, so that the feeding medium can be uniformly distributed in all the heat exchange pipe bundles a3, and the heat exchange efficiency of the falling film evaporator is improved. Of course, in the case of an emergency on site, the second control valve J2 can be closed, and the first control valve J1 can be opened, so that the propylene carbonate crude product can be directly sent to the rectifying column T301. In addition, since the propylene carbonate reactor T201 is a high-temperature and high-pressure reaction, the lower end of the propylene carbonate reactor T201 is connected with the heat exchanger E201, the propylene carbonate crude product in the rectifying column T301 is reheated and warmed by the heat exchanger E201, and the energy consumption is saved. In addition, the top of the rectifying column T301 is also provided with a warming circulating system, and the propylene carbonate crude product in the rectifying column T301 is heated by the second heat exchanger E202.
[0028] Example 2, referring to Figure 2The utility model discloses a crude propylene carbonate falling film evaporator, including crude propylene carbonate reactor T201, crude propylene carbonate storage tank V201, heat exchanger E201, feed pump P201, first falling film evaporator MVR201, rectifying tower T301, rectifying tower T301, light product storage tank V301, product storage tank V302, the side line export of crude propylene carbonate reactor T201 is connected crude propylene carbonate storage tank V201 through the pipeline, and the lower extreme of crude propylene carbonate storage tank V201 is connected first falling film evaporator MVR201 through the pipeline, and the output of first falling film evaporator MVR201 is connected the side line import of rectifying tower T301 through the pipeline, the bottom of crude propylene carbonate reactor T201 is connected the shell side import of heat exchanger E201 through the pipeline, and the shell side export of heat exchanger E201 is connected to the top end of crude propylene carbonate reactor T201 through the pipeline and feed pump P201, the tube side import of heat exchanger E201 is connected the upper side of rectifying tower T301 through the pipeline, and the lower side of rectifying tower T301 is connected to the tube side export of heat exchanger E201 through the pipeline, the upper side of rectifying tower T301 is connected light product storage tank V301 through the pipeline, and the lower side of rectifying tower T301 is connected product storage tank V302 through the pipeline.
[0029] The difference from example 1 is:
[0030] Referring to Figure 2 The lower end of the first falling film evaporator MVR201 of the embodiment is connected in parallel with a third feed pipe L3, and a third control valve J3 and a second falling film evaporator MVR202 are installed on the third feed pipe L3, and the upper end of the second falling film evaporator MVR202 is connected to the rectifying tower T301 through a pipeline.
[0031] A square packing layer a2 is respectively installed at the lower head a1 and the heat exchange tube bundle a3 of the second falling film evaporator MVR202, and a primary distribution disc a4 and a secondary distribution disc a5 are arranged in the square packing layer a2, and a plurality of small holes are respectively distributed on the primary distribution disc a4 and the secondary distribution disc a5.
[0032] The embodiment can adjust to two groups of falling film evaporation at the same time according to the production needs of the site by additionally arranging the second falling film evaporator MVR202, so as to meet the different process needs of the site.
[0033] The above is only the preferred embodiment of the utility model, and any skilled person in the art can modify the utility model or modify it into an equivalent technical solution by using the above-mentioned technical solutions. Therefore, any simple modification or equivalent transformation according to the technical solutions of the utility model is within the scope of protection required by the utility model.
Claims
1. A falling film evaporation apparatus for crude propylene carbonate, characterized by: The propylene carbonate reactor (T201), the propylene carbonate crude product storage tank (V201), the heat exchanger (E201), the feed pump (P201), the first falling film evaporator (MVR201), the rectification tower (T301), the light component storage tank (V301), and the product storage tank (V302) are connected by pipelines.
2. The crude propylene carbonate falling film evaporator apparatus according to claim 1, characterized in that: The top of the rectification tower (T301) is connected to the tube inlet of the second heat exchanger (E202) by a pipeline, and the tube outlet of the second heat exchanger (E202) is connected to the circulation storage tank (V202) by a pipeline.
3. The crude propylene carbonate falling film evaporator apparatus of claim 2, wherein: The bottom of the rectification tower (T301) is provided with a reboiler (H301).
4. The crude propylene carbonate falling film evaporator of claim 1, wherein: The lower end and the upper end of the first falling film evaporator (MVR201) are connected in parallel to the first feed pipe (L1), and the first control valve (J1) is installed on the first feed pipe (L1).
5. The crude propylene carbonate falling film evaporator of claim 4, wherein: The lower end of the first falling film evaporator (MVR201) is connected to the second feed pipe (L2), and the second control valve (J2) is installed on the second feed pipe (L2).
6. The crude propylene carbonate falling film evaporator of claim 4, wherein: The lower end of the first falling film evaporator (MVR201) is connected in parallel to the third feed pipe (L3), and the third control valve (J3) and the second falling film evaporator (MVR202) are installed on the third feed pipe (L3), and the upper end of the second falling film evaporator (MVR202) is connected to the rectification tower (T301) by a pipeline.
7. A crude propylene carbonate falling film evaporator according to claim 3 or 6, characterized in that: The lower end of the first falling film evaporator (MVR201) and the second falling film evaporator (MVR202) are respectively provided with square packing layers (a2) at the lower head (a1) and the heat exchange tube bundle (a3), and the first distribution plate (a4) and the second distribution plate (a5) are arranged in the square packing layers (a2).
8. The crude propylene carbonate falling film evaporator of claim 7, wherein: Small holes are distributed on the first distribution plate (a4) and the second distribution plate (a5).