Production system of single-ring-pipe acetone-butanol copolymerized super-permeable material

Abstract

The utility model belongs to the technical field of olefin polymerization, and particularly relates to a single-ring-pipe production system for a propylene-butanol copolymerization super-permeable material, which comprises a refining unit and a reaction unit, wherein the refining unit comprises a propylene refining unit and a butylene refining unit; the reaction unit comprises a propylene feeding tank, a prepolymerization reactor, an R201 loop reactor, a medium-pressure degassing filter, a low-pressure degassing filter, a propylene washing tower, an entrainment separator, a propylene gas circulating compressor and an ethylene stripping tower which are connected in sequence; a feeding hole of the propylene feeding tank is respectively connected with the propylene refining unit and the butylene refining unit; the top of the ethylene stripping tower is connected with the propylene feeding tank, and the bottom of the ethylene stripping tower is connected with the butylene refining unit. The propylene-butyl copolymerized super-transparent material prepared by the system has rigid-tough balance (excellent impact property and bending modulus), has better bending modulus than that of the traditional ethylene-propylene copolymer or polypropylene, and can meet the application in the fields of milk bottles, PS crystal cups and the like.

Description

Technical Field

[0001] This utility model belongs to the field of olefin polymerization technology, specifically relating to a production system for a single-ring tube propylene-butadiene copolymer ultra-permeable material. Background Technology

[0002] Polypropylene (PP) is a semi-crystalline thermoplastic with high impact resistance, strong mechanical properties, and resistance to various organic solvents and acid / alkali corrosion, making it widely used in industry. The transparency of polypropylene is inversely proportional to its haze; generally, the better the transparency, the lower the haze. Traditional transparent polypropylene has a haze of approximately 10-15%, which is insufficient for applications such as medical and transparent products.

[0003] In existing technologies, a certain amount of butene is typically added during the preparation of random copolymer polypropylene to reduce the product's haze. However, the addition of butene reduces the product's flexural modulus. Furthermore, impact performance reflects the material's toughness; greater impact strength corresponds to better toughness. However, impact performance and flexural modulus are inversely proportional; that is, better impact performance results in a lower flexural modulus. Therefore, controlling the butene content to maximize flexural modulus and impact performance without affecting haze is a crucial technical problem that urgently needs to be solved in the preparation of propylene-butene copolymer ultra-transparent materials. Utility Model Content

[0004] The purpose of this invention is to provide a production system for a single-ring tube propylene-butadiene copolymer ultra-transparent material. The propylene-butadiene copolymer ultra-transparent material prepared by this system has a balance of rigidity and toughness (both impact performance and flexural modulus are excellent), and its flexural modulus is better than that of traditional ethylene-propylene copolymers or polypropylene, which can meet the application requirements in fields such as baby bottles and PS crystal cups.

[0005] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0006] An embodiment of this utility model provides a production system for a single-ring tube propylene-butadiene copolymer ultra-transparent material, including a refining unit and a reaction unit;

[0007] The refining unit includes a propylene refining unit and a butene refining unit;

[0008] The reaction unit includes a propylene feed tank, a prepolymerization reactor, a loop reactor, a medium-pressure degassing filter, a low-pressure degassing filter, a propylene scrubbing tower, a mist separator, a propylene gas recirculation compressor, and an ethylene stripping tower connected in sequence.

[0009] The inlet of the propylene feed tank is connected to the propylene refining unit and the butene refining unit, respectively.

[0010] The top of the ethylene stripping tower is connected to the propylene feed tank, and the bottom of the ethylene stripping tower is connected to the butene refining unit.

[0011] As a further technical solution, the reaction unit also includes a steamer, a dryer, and a feeding hopper connected in sequence;

[0012] The inlet of the steam generator is connected to the bottom outlet of the low-pressure degassing filter.

[0013] As a further technical solution, the propylene washing tower is equipped with a cooler at the top; the ethylene stripping tower is equipped with a cooler at the top.

[0014] The low-pressure degassing filter is a bag filter; the loop reactor is an R201 loop reactor.

[0015] As a further technical solution, the reaction unit also includes a pre-contact tank; the pre-contact tank is connected to the pre-polymerization reactor.

[0016] As a further technical solution, the butene refining unit includes a coalescer, a butene light component removal tower, a cooler, a butene drying tower, a filter, a butene feed tank, and a centrifugal pump connected in sequence.

[0017] The centrifugal pump is used to deliver a constant flow of butene to the propylene feed tank in the reaction unit, and to return excess butene to the butene feed tank.

[0018] As a further technical solution, the propylene refining unit includes a free water separator, a COS removal tower, a light component removal tower, a propylene primary drying tower, a CO2 removal tower, a desulfurization, arsenic and phosphorus removal tower, and a propylene secondary drying tower connected in sequence.

[0019] The propylene secondary drying tower is connected to the propylene feed tank.

[0020] As a further technical solution, the production system of the single-ring tube propylene-butadiene copolymer ultra-transparent material also includes a modification unit, which includes a main material silo, an additive silo, a mixing silo, an extruder, a centrifugal dryer, a separation screen, a blending silo, a granular pneumatic conveying device, a packaging material silo, and a collection silo.

[0021] The main material silo and the additive silo are respectively connected to the mixing silo, and the mixing silo is sequentially connected to the extruder, centrifugal dryer, separation screen, blending silo, granular pneumatic conveying device, packaging material silo and collection silo.

[0022] As a further technical solution, the main silo is equipped with at least one of a low level switch indicator, a high level switch indicator, and a load sensor level gauge;

[0023] The number of additive compartments and mixing compartments is at least one;

[0024] The discharge port of the mixing chamber is equipped with a meter;

[0025] The metering device is connected to the screw rod, and the screw rod is connected to the extruder.

[0026] As a further technical solution, the centrifugal dryer is connected to a pelletizing water tank, the pelletizing water tank is equipped with a pelletizing water filter, the pelletizing water tank is connected to one end of a pelletizing water pump, and the other end of the pelletizing water pump is connected to an extruder.

[0027] As a further technical solution, the granular pneumatic conveying device includes a pneumatic conveying pipe, a buffer hopper, and a granular conveying rotary valve; the buffer hopper is connected to the granular conveying rotary valve, and the outlet and inlet of the buffer hopper are connected through the pneumatic conveying pipe.

[0028] The number of buffer hoppers is at least one; the buffer hoppers are connected to the mixing bins; and the buffer hoppers are equipped with exhaust fans.

[0029] The propylene refining unit and the butene refining unit in the refining unit are used to refine propylene and butene raw materials, respectively, thereby improving the accuracy of the propylene and butene raw material ratio.

[0030] The propylene feed tank is used to receive refined propylene and butene mixed in a certain proportion, thereby feeding the prepolymerization tank;

[0031] The prepolymerization tank is used to pre-react and polymerize the catalyst slurry in the pre-contact tank 1-1 with propylene and butene in the propylene feed tank to form a uniform premix.

[0032] The single-loop reactor is used for the copolymerization reaction of propylene and butene to obtain a primary copolymer;

[0033] The medium-pressure degassing filter is used for gas-solid separation of unreacted propylene and butene in the primary product, and the separated propylene and butene are recovered to the propylene feed tank.

[0034] The low-pressure degassing filter is used to receive the primary copolymer collected at the bottom of the medium-pressure degassing filter, and further separate the gas and solid to obtain copolymer powder.

[0035] The low-pressure degassing filter is a bag filter that can be automatically cleaned by reverse airflow pulses.

[0036] The coalescer is used to collect butene-1 transported from the boundary region;

[0037] The butene light component removal tower is used to remove light components from butene-1.

[0038] The butene drying tower is used to absorb moisture, so that the H2O content in butene-1 is less than 2ppm.

[0039] The main feed silo is used to receive the propylene-butadiene copolymer prepared by the reaction unit; the main feed silo is equipped with a low level switch indicator, a high level switch indicator and a load sensor level gauge, which can realize automated control of the normal operation of the main feed silo;

[0040] The additive bin is used to add solid additives, compounding agents, and transparency-enhancing nucleating agents, thereby increasing the transparency of the propylene-butadiene copolymer to obtain an ultra-transparent propylene-butadiene copolymer.

[0041] In the extruder, the pre-mixed propylene-butadiene copolymer and added additives are further homogenized. The rotating screw shears the resin, converting mechanical energy into heat energy to fully extrude and melt the resin. The molten polymer is pushed towards the die, and after emerging from the die holes in filamentous form, the rotating blades immediately cut it into granules. The granules are then fed into a centrifugal dryer via circulating pelletizing water (deionized water); then to a separating screen to separate out small and large particles that do not meet size requirements. Qualified granules fall into the blending chamber. The pelletizing water from the centrifugal dryer is returned to the pelletizing water tank via a pelletizing water filter, and then pumped back to the pelletizing section of the extruder for reuse.

[0042] The granular material conveying rotary valve is used to send the granular material in the buffer hopper into the air conveying pipe, so that the granular material is mixed in the buffer hopper.

[0043] The exhaust fan is used to blow the decomposed and volatilized gases in the buffer hopper into the collection bin.

[0044] The granular pneumatic conveying device enables the granules to be statically mixed in the buffer hopper via the mixing pipe; on the other hand, it sends the granules into the packaging silo through the reversing valve, thereby ensuring the mixing effect.

[0045] The beneficial effects of the above-described embodiments of this utility model are as follows:

[0046] (1) This utility model patent mixes refined butene with propylene, then puts it into a reactor with a catalyst for polymerization and drying to obtain propylene-butene copolymer; then puts the dried propylene-butene copolymer, antioxidant compounding agent and penetration-enhancing nucleating agent into a granulator for mixing, melting, underwater pelletizing, dehydration, drying, blending and packaging in one integrated process to achieve fully automated production and obtain propylene-butene copolymer ultra-transparent material.

[0047] (2) The propylene-butadiene copolymer ultra-transparent material prepared by this utility model patent has a haze of ≤5% and an impact strength of ≥4.5kJ / m² under simply supported beam conditions at 23℃. 2 The flexural modulus is ≥1154MPa. This significantly improves the transmittance of propylene-butadiene copolymers, resulting in increased transparency of the extruded and remelted propylene-butadiene copolymers. It also improves the molecular structure of the propylene-butadiene copolymers while maintaining good mechanical properties, thus enriching the applications of propylene-butadiene copolymers in daily consumer goods and enhancing the competitiveness of polypropylene products. Attached Figure Description

[0048] The accompanying drawings, which form part of this utility model, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0049] Figure 1 This is a schematic diagram of the butene refining unit in this utility model; wherein, the unit includes a coalescer 1-1, a butene light component removal tower 1-2, a cooler 1-3, a butene drying tower 1-4, a filter 1-5, a butene feed tank 1-6, and a centrifugal pump 1-7.

[0050] Figure 2 This is a schematic diagram of the propylene refining unit in this utility model; wherein, there is a free water separator 2-1, a COS removal tower 2-2, a light component removal tower 2-3, a propylene primary drying tower 2-4, a CO2 removal tower 2-5, a desulfurization, arsenic and phosphorus removal tower 2-6, and a propylene secondary drying tower 2-7.

[0051] Figure 3 This is a schematic diagram of the pre-optimized reaction unit in this utility model;

[0052] Figure 4 This is a schematic diagram of the optimized reaction unit in this utility model;

[0053] in, Figure 3 and Figure 4 The components include: pre-contact tank 3-1, propylene feed tank 3-2, prepolymerization reactor 3-3, R201 loop reactor 3-4, medium-pressure degassing filter 3-5, propylene condenser 3-6, low-pressure degassing filter 3-7, steam generator 3-8, dryer 3-9, feeding hopper 3-10, propylene washing tower 3-11, mist separator 3-12, and propylene gas recirculation compressor 3-13. Figure 4 Ethylene stripping tower 3-14 in the middle;

[0054] Figure 5 This is a schematic diagram of the modified unit in this utility model; wherein, the main material bin 1, additive bin 2, mixing bin 3, metering device 4, extruder 5, screw 6, centrifugal dryer 7, separating screen 8, blending bin 9, feeder 10, pelletizing water tank 11, pelletizing water pump 12, pellet air conveying system 13, buffer hopper 1301, pellet conveying rotary valve 1302, exhaust fan 14, and collection bin 15;

[0055] The diagram is for illustrative purposes only. Detailed Implementation

[0056] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0057] Example 1

[0058] In a typical embodiment of this utility model, a production system for a single-ring tube propylene-butadiene copolymer ultra-transparent material is provided, comprising a butene refining unit, a reaction unit, and a modification unit in sequence.

[0059] The butene refining unit is used to refine butene to obtain refined butene;

[0060] The reaction unit is used to prepare propylene-butadiene copolymer to obtain propylene-butadiene copolymer;

[0061] The modification unit is used to improve the transparency of the propylene-butadiene copolymer to obtain an ultra-transparent propylene-butadiene copolymer.

[0062] The propylene-butadiene copolymer ultra-transparent material prepared by the single-ring tube production system has a haze of ≤5% and an impact strength of ≥4.5 kJ / m² under simply supported beam conditions at 23°C. 2 Flexural modulus ≥ 1154 MPa.

[0063] like Figure 1 The diagram shows a schematic of a butene refining unit, which includes a coalescer 1-1, a butene light component removal tower 1-2, a cooler 1-3, a butene drying tower 1-4, a filter 1-5, a butene feed tank 1-6, and a centrifugal pump 1-7 connected in sequence. The centrifugal pump 1-7 is used to deliver a constant flow rate of butene to the propylene feed tank 3-2 in the reaction unit, and to return excess butene to the butene feed tank 1-6.

[0064] The purification process of butene is as follows:

[0065] Butene-1 is fed from the coalescer 1-1 to the butene light component removal tower 1-2, which operates at a pressure of approximately 0.5 MPa. The butene-1 at the bottom of the light component removal tower 1-2, under controlled level conditions, is then sent to the butene drying tower 1-4 via the cooler 1-3. The drying tower 1-4 is used to dry and absorb the moisture in the butene-1, ensuring that the H2O content in the butene-1 supplied to the polymerization section is less than 2 ppm. The butene-1 exiting the drying tower 1-4 is filtered by the filter 1-5 and then sent to the butene feed tank 1-6. Butene from the boundary zone continuously fills the butene feed tank 1-6. The butene feed tank 1-6 operates at a controlled pressure (0.5 MPa). Centrifugal pump 1-7 delivers butene to the butene feed tank 1-6. To maintain a constant discharge line pressure, the flow rate through centrifugal pump 1-7 must remain constant. Excess flow from centrifugal pumps 1-7 is circulated back to butene feed tanks 1-6 after passing through a jacketed tube water cooler. A steam-heated tube heater is used to maintain the pressure in butene feed tanks 1-6.

[0066] like Figure 2 The diagram shows a schematic of a propylene refining unit, which includes, in sequence, a free water separator 2-1, a COS removal tower 2-2, a light component removal tower 2-3, a primary propylene drying tower 2-4, a CO2 removal tower 2-5, a desulfurization, arsenic, and phosphorus removal tower 2-6, and a secondary propylene drying tower 2-7. The secondary propylene drying tower 2-7 is connected to the propylene feed tank 3-2.

[0067] The refining process of propylene is as follows:

[0068] Fresh propylene from the boundary area passes through a free water separator 2-1 to remove free water from the feedstock. The water separated in the free water separator 2-1 is first degassed in a water collection tank. The propylene from the free water separator 2-1 passes through a COS removal tower 2-2. The propylene exiting the COS removal tower 2-2 is heated to 45°C by a heater and then enters a light component removal tower 2-3, where propylene vapor generated by a reboiler removes CO and other light component impurities. The propylene from the bottom of the light component removal tower is cooled by a heat exchanger, and the recovered heat is used to preheat the fresh propylene entering the light component removal tower. After passing through a heat exchanger and cooler, the propylene temperature is cooled to 40°C and sent to the primary propylene drying tower 2-4 to remove monomeric water. Then it enters the propylene CO2 removal tower 2-5, followed by the propylene desulfurization, arsenic, and phosphorus removal tower 2-6, and finally the secondary propylene drying tower 2-7 to further remove moisture from the feedstock before entering the propylene feed tank 3-2.

[0069] like Figure 4 As shown, a schematic diagram of the reaction unit is provided, from... Figure 4As can be seen, the reaction unit includes, in sequence, a propylene feed tank 3-2, a prepolymerization reactor 3-3, an R201 loop reactor 3-4, a medium-pressure degassing filter 3-5, a low-pressure degassing filter 3-7, a propylene washing tower 3-11, a mist separator 3-12, a propylene gas recirculation compressor 3-13, and an ethylene stripping tower 3-14; the inlet of the propylene feed tank 1-2 is connected to the propylene refining unit and the butene refining unit, respectively; the reaction unit also includes, in sequence, a steam generator 3-8, a dryer 3-9, and a feed hopper 3-10; the inlet of the steam generator 1-8 is connected to the bottom outlet of the low-pressure degassing filter 3-7. A cooler is installed at the top of the propylene washing tower 3-11; a cooler is installed at the top of the stripping tower 3-14; the low-pressure degassing filter 3-7 is a bag filter. The reaction unit also includes a pre-contact tank 3-1; the pre-contact tank 3-1 is connected to the prepolymerization reactor 3-3.

[0070] Figure 3 This is a schematic diagram of the reaction unit before optimization. Figure 3 In the mist separator 3-12, propylene gas and oil are separated. Propylene and butene gas enter the propylene gas circulation compressor 3-13. After being pressurized in the propylene gas circulation compressor 3-13, they are recovered to the propylene condenser 3-6 and then pumped back to the propylene feed tank 1-2 by the propylene circulation pump.

[0071] Figure 4 The main improvement of the reaction unit is the addition of an ethylene stripping tower 3-14. Propylene and butene gases enter the propylene gas recirculation compressor 3-13 and are then sent to the ethylene stripping tower 3-14 after being pressurized. Propylene and butene are separated in the ethylene stripping tower 3-14. The propylene separated at the top of the ethylene stripping tower 3-14 is cooled down by a cooler and sent back to the propylene recovery tank 3-2 through pressure difference. The butene at the bottom of the ethylene stripping tower 3-14 is sent to the refined butene tank.

[0072] The reaction process of the improved reaction unit is as follows:

[0073] The catalyst slurry is pre-contacted and activated with TEAL (co-catalyst) and DONOR (electron donor) in pre-contact tank 3-1. The main catalyst, DONOR, and TEAL are separately metered into pre-contact tank 3-1, which operates at full capacity. The main catalyst enters pre-contact tank 3-1 through a separate bottom-insertion pipe. The pre-contact mixture is discharged to prepolymerization reactor 3-2 via overflow to prevent bubble generation. In the optimized propylene-butene production process, propylene feed tank 3-2 continuously receives propylene from the propylene refining unit and butene from the butene unit. After mixing in propylene feed tank 3-2 at a propylene to butene ratio of 10:1, the mixture is fed into prepolymerization reactor 3-3 and R201 loop reactor 3-4. The temperature of R201 loop reactor 3-4 is controlled at 65℃±0.5℃, and the pressure is 4.0±0.1 MPa.

[0074] Starting from the discharge from the R201 loop reactor 3-4, unreacted propylene and butene are separated. The slurry from the R201 loop reactor 3-4 flows through a flash line to the medium-pressure degassing filter 3-5. As the system pressure decreases from 4.2 MPa in the R201 loop reactor to 1.8 MPa in the medium-pressure degassing filter 3-5, propylene and butene vaporize in the heating line and in the medium-pressure degassing filter 3-5. The steam pressure is adjusted to maintain the outlet gas temperature of the medium-pressure degassing filter 3-5 at 80°C. The vapor is then recovered to the propylene condenser 3-6 and pumped back to the propylene feed tank 3-2 by the propylene circulation pump.

[0075] The polymer collected from the bottom of the medium-pressure filter 3-5 is discharged under horizontal control to the low-pressure degassing filter 3-7. Filter 3-7 is a bag filter that is automatically cleaned by reverse pulse of the process airflow. The airflow leaving filter 3-7 is cleaned in tower 3-11 with a mixture of 50% paraffin oil and 50% Atmer 163 to remove entrained powder and minimize the alkyl aluminum content entering the compressor, thereby producing a stable complex. The washed propylene gas is cooled by the top cooler of the propylene washing tower 3-11 and then enters the mist separator 3-12. In the mist separator 3-12, the propylene gas is separated from the oil. The propylene and butene gas enter the propylene gas recirculation compressor 3-13. After being pressurized by the compressor, it is sent to the ethylene stripping tower 3-14. Propylene and butene are separated in the ethylene stripping tower 3-14. The propylene separated at the top of the ethylene stripping tower 3-14 is cooled by a cooler and sent back to the propylene recovery tank 3-2 by pressure difference. The butene at the bottom of the ethylene stripping tower 3-14 is sent to the refined butene tank.

[0076] Polypropylene powder from the bottom of the low-pressure degassing filter 3-7 enters the steam generator 3-8 under gravity. Two streams of low-pressure steam are introduced at the bottom of the steam generator 3-8 to deactivate residual catalyst and TEAL, and remove residual hydrocarbons. The operating temperature of the steam generator 3-8 is 108–110°C. The polymer is discharged to the dryer 3-9 by gravity under controlled level conditions. Hot nitrogen gas, under flow control, is blown upward from the porous distribution plate at the bottom of the dryer 3-9. By controlling the gas flow rate, the wet polypropylene powder forms a fluidized bed within the dryer 3-9. Through heat transfer between the hot nitrogen gas and the polymer, the hot nitrogen gas removes the moisture from the polymer.

[0077] Polypropylene (PP) powder from dryer 3-9 is fed into feed hopper 3-10 via a rotary valve, and then into the nitrogen pneumatic conveying pipeline via another rotary valve. Compressed nitrogen supplied by a nitrogen screw compressor is used to transport the dried PP powder to the powder buffer silo.

[0078] Based on the above analysis, compared with the existing process flow, the optimized process can achieve better separation of propylene and butene after the reaction, thus enabling more precise control of the feed ratio of propylene and butene in raw material tank 3-2.

[0079] like Figure 5 As shown, a structural schematic diagram of the modification unit is provided. The modification unit includes a main material silo 1, an additive silo 2, a mixing silo 3, an extruder 5, a centrifugal dryer 7, a separating screen 8, a blending silo 9, a granular pneumatic conveying device 13, a packaging material silo, and a collection silo 15.

[0080] The main material silo 1 is used to receive the propylene-butadiene copolymer prepared by the reaction unit; preferably, the main material silo 1 is equipped with at least one of a low level switch indicator, a low-low level switch indicator, a high level switch indicator, a high level switch indicator, and a load sensor level gauge, which can realize automated control of the normal operation of the main material silo.

[0081] The additive bin 2 is used to add solid additives, compounding agents, and transparent nucleating agents, thereby increasing the transparency of the propylene-butadiene copolymer to obtain a propylene-butadiene copolymer ultra-transparent material.

[0082] The additive chamber 2 and the mixing chamber 3 are at least one, and the discharge port of the mixing chamber 3 is equipped with a meter 4; the meter 4 is connected to the screw rod 6, and the screw rod 6 is connected to the extruder 5;

[0083] The flow rate of the meter 4 can be determined according to the formula at a preset ratio to determine the flow rate of all additives (solid additives, compounding agents, and permeability-enhancing nucleating agents) and directly discharged into the mixing chamber 3, thereby ensuring that the mixture obtained in the mixing chamber 3 is continuously added to the hopper of the extruder 5.

[0084] The centrifugal dryer 7 is connected to a pelletizing water tank 11, which is equipped with a pelletizing water filter. The pelletizing water tank 11 is connected to one end of a pelletizing water pump 12, and the other end of the pelletizing water pump 12 is connected to an extruder 5.

[0085] The granular pneumatic conveying device 13 includes a pneumatic conveying pipe, a buffer hopper 1301, and a granular conveying rotary valve 1302; the buffer hopper 1301 is connected to the granular conveying rotary valve 1302, and the outlet and inlet of the buffer hopper 1301 are connected through the pneumatic conveying pipe; the granular conveying rotary valve 1302 is used to send the granules in the buffer hopper 1301 into the pneumatic conveying pipe, so that the granules are mixed in the buffer hopper 1301.

[0086] There is at least one buffer hopper 1301; the buffer hopper is connected to the mixing chamber 9; the buffer hopper 1301 is equipped with an exhaust fan 14, which is used to blow the decomposed and volatilized gas in the buffer hopper 1301 into the collection chamber 15.

[0087] The granular pneumatic conveying device 13 enables the granules to be statically mixed in the buffer hopper 1301 via the mixing pipe; on the other hand, it sends the granules into the packaging hopper through the granular conveying rotary valve 1302, thereby ensuring the mixing effect.

[0088] The modification process of the propylene-butadiene copolymer is as follows:

[0089] The volume of main silo 1 is approximately 1000 m³. 3 The polymer self-feeding silo 1 flows by gravity into the powder metering screw feeder and continues into the polymer metering device 4. In the event of a short-term failure in the downstream unit, the main silo 1 continues feeding, typically under low-level control. The main silo 1 is equipped with vibrating low-level and low-low-level indicators (LAL-28003 and LALL-28004) and high-level and high-high-level switch indicators (LAH-8002 and LAHH-8001). A load sensor level gauge (WIA-8001) on the silo of the main silo 1 provides information on the polymer powder content inside the main silo 1. The normal operating pressure of the main silo 1 is approximately 0.002 MPa. A vent valve installed at the top of the main silo 1 releases pressure when it reaches above 0.01 MPa and introduces air into the main silo 1 when the vacuum exceeds -0.0005 MPa.

[0090] The polymer in additive bin 2 is conveyed to mixing bin 3 (polymer / additive mixer). The flow rate of meter 4 is typically determined by a preset ratio to account for all additives (solid additives, compounding agents, and penetration enhancers / nucleating agents). The additive preparation unit discharges directly into mixing bin 3, and the mixture produced in mixing bin 3 is continuously fed into the hopper of extruder 5.

[0091] In extruder 5, the mixed propylene-butadiene copolymer powder and added additives are further and uniformly mixed. The rotating screw shears the resin, converting mechanical energy into heat energy to fully extrude and melt the resin. The molten polymer is pushed towards the die, and after it emerges from the die holes in filaments, the rotating blades immediately cut it into granules. The cut granules are sent to centrifugal dryer 7 via circulating pelletizing water (deionized water), where the granules are separated from the water and dried. They are then sent to separation screen 8 to separate out small and large particles that do not meet size requirements. Qualified granules fall into blending chamber 9. The pelletizing water from centrifugal dryer 7 is returned to pelletizing water tank 11 via pelletizing water filter, and then pumped back to the pelletizing section of extruder 5 by pelletizing water pump 12 in the blending chamber for reuse.

[0092] The granular pneumatic conveying system 13 is used to pneumatically convey the PP granules from the lower outlet of the buffer hopper 1301 back to the upper inlet of the buffer hopper 1301, so that the granules are statically mixed in the buffer hopper 1301 through the mixing pipe. Multiple buffer hoppers 1301 are arranged side-by-side. Each buffer hopper 1301 is equipped with an exhaust fan 14, which blows the gases decomposed and volatilized in the buffer hopper 1301 into a collection chamber 15 equipped with a filter.

[0093] The granules in the buffer hopper 1301 are evenly fed into the pneumatic conveying system's air delivery pipe via the granule conveying rotary valve 1302, thus delivering the PP granules into the buffer hopper 1301. Since the extruder 5 cannot guarantee that the quality of the same batch of granules produced at every instant is absolutely identical, a blending bin 9 and a granule pneumatic conveying device 13 are installed to ensure the relative uniformity of the final product. This granule pneumatic conveying device 13 re-pneumatically conveys the PP granules from the lower outlet of the blending bin 9 to the upper inlet of the blending bin 9, allowing the granules to undergo static blending within the bin via the blending pipe. The circulating granules from the granule pneumatic conveying device 13 and the granules from the pneumatic conveying system are automatically controlled and selected by the automatic control system to prevent them from simultaneously entering the same buffer hopper granule pneumatic conveying device 1301.

[0094] When producing a product grade containing a penetration enhancer and nucleating agent, the purging line at the bottom of the blending bin 9 is connected. The air supplied by the bin exhaust fan 14 blows the gas that decomposes and volatilizes in the blending bin 9 into the collection bin 15 for filtration, and then discharges it into the atmosphere.

[0095] The production apparatus for single-ring tube propylene-butene copolymer ultratransparent material provided by this utility model involves adding butene to a polypropylene reactor to cause the polypropylene molecular structure to arrange randomly, thereby increasing the light transmittance of polypropylene. Then, in the extrusion melting stage, polypropylene with a melt index of 14-18 g / 10 min is added to a clearing nucleating agent and mixed at 170-220°C for 2-3 hours. After maintaining the mixing state, the mixture is cooled and granulated. The clearing nucleating agent includes alcohol compounds, which can effectively improve the light transmittance of propylene-butene polymer. This results in increased transparency and reduced haze of the granulated propylene-butene polymer, while maintaining good mechanical properties. This enriches the application of propylene-butene polymer in daily necessities and enhances the competitiveness of propylene-butene polymer products.

[0096] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A production system of single ring pipe propylene-butylene copolymer ultra transparent material, characterized in that, Includes a refining unit and a reaction unit; The refining unit includes a propylene refining unit and a butene refining unit; The reaction unit includes a propylene feed tank, a prepolymerization reactor, a loop reactor, a medium-pressure degassing filter, a low-pressure degassing filter, a propylene scrubbing tower, a mist separator, a propylene gas recirculation compressor, and an ethylene stripping tower connected in sequence. The inlet of the propylene feed tank is connected to the propylene refining unit and the butene refining unit, respectively. The top of the ethylene stripping tower is connected to the propylene feed tank, and the bottom of the ethylene stripping tower is connected to the butene refining unit.

2. The production system of single ring pipe co-polymerized propylene-butylene super transparent material according to claim 1, characterized in that, The reaction unit also includes a steamer, a dryer, and a feeding hopper connected in sequence. The inlet of the steam generator is connected to the bottom outlet of the low-pressure degassing filter.

3. The production system of single ring tube copolymerized polybutene-1 ultra- transparent material according to claim 1, characterized in that, The propylene washing tower is equipped with a cooler at the top; the ethylene stripping tower is equipped with a cooler at the top. The low-pressure degassing filter is a bag filter; the loop reactor is an R201 loop reactor.

4. The production system for single-ring tube propylene-butyl copolymer ultra-permeable material as described in claim 1, characterized in that, The reaction unit also includes a pre-contact tank; the pre-contact tank is connected to the pre-polymerization reactor.

5. The production system for single-ring tube propylene-butyl copolymer ultra-permeable material as described in claim 1, characterized in that, The butene refining unit includes a coalescer, a butene light component removal tower, a cooler, a butene drying tower, a filter, a butene feed tank, and a centrifugal pump connected in sequence. The centrifugal pump is used to deliver a constant flow of butene to the propylene feed tank in the reaction unit, and to return excess butene to the butene feed tank.

6. The production system for single-ring tube propylene-butyl copolymer ultra-permeable material as described in claim 1, characterized in that, The propylene refining unit includes a free water separator, a COS removal tower, a light component removal tower, a propylene primary drying tower, a CO2 removal tower, a desulfurization, arsenic and phosphorus removal tower, and a propylene secondary drying tower connected in sequence. The propylene secondary drying tower is connected to the propylene feed tank.

7. The production system for single-ring tube propylene-butadiene copolymer ultra-permeable material as described in claim 1, characterized in that, The production system for the single-ring tube propylene-butadiene copolymer ultra-transparent material also includes a modification unit, which includes a main material silo, an additive silo, a mixing silo, an extruder, a centrifugal dryer, a separation screen, a blending silo, a granular pneumatic conveying device, a packaging material silo, and a collection silo. The main material silo and the additive silo are respectively connected to the mixing silo, and the mixing silo is sequentially connected to the extruder, centrifugal dryer, separation screen, blending silo, granular pneumatic conveying device, packaging material silo and collection silo.

8. The production system of single-tube copolymerized ultra-transparent polyvinyl butyral according to claim 7, wherein the polyvinyl butyral is produced by the process of claim 1. The main silo is equipped with at least one of a low level switch indicator, a high level switch indicator, and a load sensor level gauge; The number of additive compartments and mixing compartments is at least one; The discharge port of the mixing chamber is equipped with a meter; The metering device is connected to the screw rod, and the screw rod is connected to the extruder.

9. The production system for single-ring propylene-butadiene copolymer ultra-permeable material as described in claim 7, characterized in that, The centrifugal dryer is connected to a pelletizing water tank, which is equipped with a pelletizing water filter. The pelletizing water tank is connected to one end of a pelletizing water pump, and the other end of the pelletizing water pump is connected to an extruder.

10. The production system for single-ring propylene-butadiene copolymer ultra-transparent material as described in claim 7, characterized in that, The granular pneumatic conveying device includes a pneumatic conveying pipe, a buffer hopper, and a granular conveying rotary valve; the buffer hopper is connected to the granular conveying rotary valve, and the outlet and inlet of the buffer hopper are connected through the pneumatic conveying pipe. The number of buffer hoppers is at least one; the buffer hoppers are connected to the mixing bins; and the buffer hoppers are equipped with exhaust fans.

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