Polypropylene multi-unit synergistic devolatilization system
By introducing intermittent vacuum dryers and hot air drying technology into polypropylene production, the problem of VOC pollution in polypropylene resin has been solved, efficient multi-stage devolatilization has been achieved, the process flow has been simplified, and equipment modification costs have been reduced.
Patent Information
- Application Number
- CN202423286625.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-31
- Publication Date
- 2026-01-02
- Estimated Expiration
- 2034-12-31
AI Technical Summary
In the current production of polypropylene resin, the problem of volatile organic compound (VOC) pollution is difficult to solve effectively, and the existing devolatilization technology is easily limited by production processes and equipment, resulting in high costs and complexity.
By adopting a polypropylene multi-unit synergistic devolatilization system and adding an intermittent vacuum dryer, multi-stage devolatilization of powder and granules is achieved through a combination of vacuum stirring and hot air drying, reducing the need for modification of core equipment and improving devolatilization efficiency.
It achieves complete removal of volatile components, reduces process complexity, improves devolatilization efficiency, and reduces the need for modification of core equipment.
Smart Images
Figure CN223750003U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to a kind of polypropylene multi-unit synergistic devolatilization system, belong to the devolatilization technical field of polypropylene production process. BACKGROUND
[0002] Polypropylene resin has excellent processing and application performance, and is widely used in packaging, automobiles, electrical appliances, furniture and medical and health fields. However, due to the influence of monomers, catalysts, polymerization processes and degradation, polypropylene resin and its products still release volatile organic compounds (VOC) to pollute the environment and harm human health to varying degrees. With the increasing awareness of environmental protection and safety, the prevention and control of VOC in polypropylene resin has attracted more and more attention from consumers and producers.
[0003] In industrial production, the sources of polypropylene resin VOC include unreacted small molecule organic compounds remaining in the polymerization unit and thermal degradation products of polypropylene resin and additives in the extrusion and granulation unit.
[0004] According to the sources of polypropylene resin VOC, there are many reports on reducing polypropylene resin VOC in petrochemical enterprises at present, mainly using devolatilization technology including flash devolatilization of powder after polymerization and melt devolatilization to improve the emission of VOC in the original polypropylene material.
[0005] However, polypropylene resin powder flash devolatilization and melt devolatilization are easily limited by production process and equipment, and the devolatilization effect is easily affected by factors such as operating conditions, making it difficult to achieve maximum VOC removal efficiency. Not only is the cost high, but also the process is complex. INVENTION CONTENTS
[0006] The purpose of the present utility model is to overcome the shortcomings of the prior art, and to provide a polypropylene multi-unit synergistic devolatilization system. By adding an intermittent vacuum dryer, the modification of the core equipment, double-screw extruder, is reduced, the process complexity of the melt devolatilization system is significantly reduced, the devolatilization efficiency is improved, and the volatile components can be completely removed.
[0007] To achieve the above-mentioned purpose, the utility model is implemented by using the following technical scheme:
[0008] In the first aspect, the utility model provides a polypropylene multi-unit synergistic devolatilization system, comprising:
[0009] A polypropylene powder solid-phase devolatilization unit includes an intermittent vacuum dryer and a powder collection tank, and the outlet of the intermittent vacuum dryer is connected to the inlet of the powder collection tank.
[0010] The extrusion granulation devolatilization unit comprises an extruder and a granulator, the outlet of the powder collecting tank is connected with the feeding port of the extruder, and the outlet of the extruder is connected with the granulator;
[0011] The pellet devolatilization unit comprises a hot air drying bin, and the outlet of the granulator is connected with the inlet of the hot air drying bin.
[0012] The outlet of the hot air drying bin is used for connecting a packaging production line.
[0013] Further, the intermittent vacuum dryer is a rake type vacuum dryer, and the intermittent vacuum dryer comprises a cylinder wall, a first stirrer rotatably arranged in the cylinder wall, a steam inlet arranged at the top and side of the cylinder wall, a feeding port and a first vacuum exhaust port arranged at the top of the cylinder wall.
[0014] Further, two second vacuum exhaust ports are arranged in the extruder.
[0015] Further, a second stirrer is arranged in the hot air drying bin, an air inlet is arranged at the bottom of the hot air drying bin, and an exhaust port is arranged at the top of the hot air drying bin.
[0016] Further, a scraper is arranged on the first stirrer of the intermittent vacuum dryer, and the distance between the scraper and the cylinder wall is adjustable.
[0017] Further, an automatic back-blowing filter is arranged at the vacuum exhaust port at the top of the intermittent vacuum dryer.
[0018] Further, the air inlet at the bottom of the hot air drying bin is connected with hot air or air.
[0019] Further, all the exhaust ports are connected with a tail gas recovery unit.
[0020] Compared with the prior art, the device has the following beneficial effects:
[0021] The utility model provides a kind of polypropylene multi-unit collaborative devolatilization system, before extrusion devolatilization, intermittent vacuum dryer is increased, can remove the small molecule substance in powder to maximum extent. BRIEF DESCRIPTION OF DRAWINGS
[0022] Figure 1 It is the structure diagram of the polypropylene multi-unit collaborative devolatilization system provided by the utility model embodiment.
[0023] In the drawing: 1, intermittent vacuum dryer; 2, extruder; 3, hot air drying bin; 4, powder collecting tank; 5, granulator. DETAILED DESCRIPTION
[0024] The utility model will be further described below in conjunction with the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the utility model, and cannot limit the protection scope of the utility model.
[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.
[0026] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Example
[0027] like Figure 1 As shown in the figure, this embodiment introduces a polypropylene multi-unit synergistic devolatilization system, including: a polypropylene powder solid-phase devolatilization unit, an extrusion granulation devolatilization unit, and a pellet devolatilization unit. The polypropylene powder solid-phase devolatilization unit transports the polypropylene powder that has completed catalyst deactivation to an intermittent vacuum dryer 1 for vacuum stirring, drying, and devolatilization; the extrusion granulation devolatilization unit blends the dried and devolatilized powder with additives and performs melt devolatilization through an extruder 2 equipped with a vacuum exhaust port; the pellet devolatilization unit stores the polypropylene pellets in a hot air drying silo 3 and uses hot air to purge the pellets for devolatilization.
[0028] The polypropylene powder solid-phase devolatilization unit includes an intermittent vacuum dryer 1 and a powder collection tank 4, with the outlet of the intermittent vacuum dryer 1 connected to the inlet of the powder collection tank 4; the extrusion granulation devolatilization unit includes an extruder 2 and a granulator 5, with the outlet of the powder collection tank 4 connected to the feed inlet of the extruder 2 and the outlet of the extruder 2 connected to the granulator 5; the granulation devolatilization unit includes a hot air drying hopper 3, with the outlet of the granulator 5 connected to the inlet of the hot air drying hopper 3; wherein, the outlet of the hot air drying hopper 3 is used to connect to the packaging production line.
[0029] The intermittent vacuum dryer 1 is a rake type vacuum dryer, which comprises a cylinder wall, a first agitator rotatably arranged in the cylinder wall, steam inlets arranged at the top and side of the cylinder wall, a feeding inlet and a first vacuum exhaust arranged at the top of the cylinder wall, and the polypropylene material is fed from the top feeding inlet and discharged from the bottom; the extruder 2 is provided with two second vacuum exhausts; the hot air drying bin 3 is provided with a second agitator inside, an air inlet at the bottom and an exhaust at the top; the first agitator of the intermittent vacuum dryer 1 is provided with a scraper, and the distance between the scraper and the cylinder wall is adjustable; the vacuum exhaust at the top of the intermittent vacuum dryer 1 is provided with an automatic back-blowing filter; the air inlet at the bottom of the hot air drying bin 3 is connected to a hot air or air inlet; and all the exhausts are connected to a tail gas recovery unit.
[0030] In use, in the intermittent vacuum dryer 1, a specific temperature is maintained, the powder is continuously turned over by the stirring of the first agitator stirring paddle, the powder surface is uniformly exposed to the heat source, the evaporation of small molecules is accelerated, and a negative pressure environment is provided to continuously extract the evaporated small molecules out of the intermittent vacuum dryer 1. The powder after drying and devolatilization carries small molecules that cannot be removed inside the powder and enters the extruder 2 to form particles by melting and devolatilization. The small molecules that are not completely removed adhere to the surface of the particles, and then the hot air drying bin 3 is heated and dried, the hot air drying bin 3 blows hot air at a suitable temperature, which helps the second agitator to turn over the particles and heat the particles, breaks the adsorption balance, further removes small molecules, and finally obtains low-VOC polypropylene resin.
[0031] The utility model is controlled by three devolatilization units, by increasing the intermittent vacuum dryer, the modification of the core equipment double screw extruder is reduced, the process complexity of the melt devolatilization system is obviously reduced, the devolatilization efficiency is improved, and the volatile components can be completely removed.
[0032] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled persons in the technical field, without departing from the technical principles of the utility model, a number of improvements and deformations can be made, and these improvements and deformations should be regarded as the protection range of the utility model.
Claims
1. A polypropylene multi-unit synergistic devolatilization system characterized by, The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit.
2. The polypropylene multi-unit co-swing system of claim 1, wherein: The application relates to a polypropylene powder solid-phase devolatilization unit.
3. The polypropylene multi-unit co-syngas devolatilization system of claim 1, wherein: The application relates to a polypropylene powder solid-phase devolatilization unit.
4. The polypropylene multi-unit co-swing system of claim 1, wherein: The application relates to a polypropylene powder solid-phase devolatilization unit.
5. The polypropylene multi-unit co-swing system of claim 2, wherein: The application relates to a polypropylene powder solid-phase devolatilization unit.
6. The polypropylene multi-unit co-swing system of claim 2, wherein: The application relates to a polypropylene powder solid-phase devolatilization unit.
7. The polypropylene multi-unit co-syngas devolatilization system of claim 4, wherein: The application relates to a polypropylene powder solid-phase devolatilization unit.
8. The polypropylene multi-unit co-syngas devolatilization system of any one of claims 2-6, wherein: The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application relates to a polypropylene powder solid-phase devolatilization unit. The application
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