Novel modular PBAT preparation process system

Abstract

The utility model discloses a novel modular preparation PBAT process system, which relates to the field of novel modular preparation PBAT process systems, and comprises a slurry blending kettle, one side of the slurry blending kettle is connected with an esterification kettle A through a pipeline, one side of the esterification kettle A is connected with an esterification kettle B through a pipeline, one side of the esterification kettle B is connected with a pre-polycondensation reactor through a pipeline, and the pre-polycondensation reactor is connected with a pre-polycondensation reactor through a pipeline. One side of the pre-polycondensation reactor is connected with a filter tank through a pipeline, the filter tank is connected with a polycondensation reactor through a pipeline, one side of the polycondensation reactor is connected with a final polycondensation reactor through a pipeline, one side of the final polycondensation reactor is connected with a granulator through a pipeline, and one side of the granulator is connected with a dryer through a pipeline.

Description

TECHNICAL FIELD

[0001] The utility model relates to a novel modular preparation PBAT process system field, specifically, a novel modular preparation PBAT process system. BACKGROUND

[0002] At present, the preparation process of PBAT has problems such as high energy consumption, low by-product recovery efficiency, limited product purity, etc., which is difficult to meet the needs of industrialized production of environmentally friendly polymer materials. Therefore, it is urgent to develop an integrated design preparation system to optimize the reaction conditions, efficiently recover by-products and meet the emission standards of tail gas.

[0003] At present, the preparation of PBAT is mainly realized through esterification and polycondensation reactions, but the existing preparation process still has the following problems:

[0004] 1. Low recovery rate of by-products: volatile by-products such as tetrahydrofuran are produced in esterification and polycondensation reactions, and the traditional process is not sufficient for their recovery, resulting in resource waste and environmental pollution.

[0005] 2. Limited product purity: there are many side reactions in the polymerization reaction, and it is difficult to effectively remove the residual oligomers and impurities in the product, affecting the performance of PBAT.

[0006] 3. High energy consumption and low efficiency: the traditional reactor design and control system cannot optimize the reaction conditions, resulting in low reaction efficiency and high energy consumption.

[0007] 4. Insufficient environmental protection: the treatment of reaction tail gas and wastewater is not perfect, which is difficult to meet the increasingly strict environmental protection requirements. INVENTION CONTENTS

[0008] In view of the problems in the related art, the utility model provides a novel modular preparation PBAT process system to overcome the above technical problems existing in the prior art.

[0009] Therefore, the specific technical scheme adopted by the utility model is as follows:

[0010] A novel modular preparation PBAT process system, comprising a slurry preparation kettle, an esterification kettle A connected to one side of the slurry preparation kettle through a pipeline, an esterification kettle B connected to one side of the esterification kettle A through a pipeline, a pre-polycondensation reactor connected to one side of the esterification kettle B through a pipeline, a filter tank connected to one side of the pre-polycondensation reactor through a pipeline, a polycondensation reactor connected to the filter tank through a pipeline, a final polycondensation reactor connected to one side of the polycondensation reactor through a pipeline, a pelletizer connected to one side of the final polycondensation reactor through a pipeline, and a dryer connected to one side of the pelletizer through a pipeline.

[0011] Further, a filter cleaning system is arranged on one side of the filter tank.

[0012] Further, one side of the esterification kettle A and the esterification kettle B is connected with a process tower through a pipeline respectively, and one side of the process tower is connected with an esterification vacuum machine through a pipeline.

[0013] Further, the pre-polycondensation reactor and the polycondensation reactor are connected with a pre-polycondensation scraper condenser through a pipeline respectively, and one side of the pre-polycondensation scraper condenser is connected with a pre-polycondensation vacuum machine through a pipeline.

[0014] Further, one side of the terminal polycondensation reactor is connected with a terminal polycondensation scraper condenser through a pipeline, and one side of the terminal polycondensation scraper condenser is connected with a terminal polycondensation vacuum machine through a pipeline.

[0015] Further, one side of the pre-polycondensation vacuum machine and the terminal polycondensation vacuum machine is connected with a spray tower through a pipeline, one side of the spray tower is connected with a THF recovery system through a pipeline, one side of the THF recovery system is connected with a stripping tower through a pipeline, and one side of the stripping tower is connected with a heat medium incinerator through a pipeline.

[0016] Further, the esterification vacuum machine is connected with the spray tower through a pipeline, and the spray tower is connected with the heat medium incinerator through a pipeline.

[0017] Wherein:

[0018] 1. Slurry preparation kettle, used for mixing raw materials and initial homogenization;

[0019] 2. Esterification kettle A, used in combination with esterification kettle B to complete esterification reaction;

[0020] 3. Esterification kettle B, used to further improve esterification rate, and the product is transported to the pre-polycondensation reactor;

[0021] 4. Pre-polycondensation reactor, used to complete initial polymerization of intermediate product;

[0022] 5. Filtration tank, used to remove insoluble impurities in the reaction;

[0023] 6. Polycondensation reactor, used to further improve polymerization degree;

[0024] 7. Terminal polycondensation reactor, used to obtain high molecular weight PBAT;

[0025] 8. Granulator, used to prepare PBAT particles meeting specifications;

[0026] 9. Dryer, used to remove moisture and volatile impurities and improve product purity;

[0027] 10. Filtration and cleaning system, used to collect butanediol and water in the filtration tank;

[0028] 11. Process tower, used in cooperation with the spray tower to complete recovery of volatile by-products;

[0029] 12-esterification vacuum machine, providing negative pressure environment for esterification reaction;

[0030] 13-prepolycondensation scraper condenser, condensing non-condensable gas entering the vacuum system;

[0031] 14-prepolycondensation vacuum machine, providing negative pressure environment for prepolycondensation reaction;

[0032] 15-final condensation scraper condenser, condensing non-condensable gas entering the vacuum system;

[0033] 16-final condensation vacuum machine, providing negative pressure environment for final condensation reaction;

[0034] 17-spray tower, further purifying tail gas and reducing emission pollution;

[0035] 18-THF recovery system, recovering tetrahydrofuran by condensation separation;

[0036] 19-stripping tower, used for treating unrecovered low-boiling gas;

[0037] 20-heat medium incinerator, performing standard treatment on tail gas.

[0038] The beneficial effects of the utility model are:

[0039] (1), the application of the vacuum system effectively reduces the condensation reaction temperature and energy consumption, and improves the product purity and the uniformity of the molecular weight distribution;

[0040] (2), the THF recovery system realizes efficient recovery and recycling of tetrahydrofuran, and reduces raw material waste;

[0041] (3), the combined design of the process tower and the spray tower significantly optimizes tail gas treatment and recovery efficiency, and reaches the environmental protection emission standard;

[0042] (4), the modularization and automation design improves the flexibility and operation efficiency of the production line, and is convenient for large-scale production and later maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed in the embodiments will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings according to these drawings without creating creative labor.

[0044] Figure 1 It is a main structure schematic diagram of a novel modular PBAT preparation process system according to the utility model embodiment.

[0045] In the drawing:

[0046] 1. Slurry mixing vessel; 2. Esterification vessel A; 3. Esterification vessel B; 4. Prepolymerization reactor; 5. Filter tank; 6. Polycondensation reactor; 7. Final polycondensation reactor; 8. Pelletizer; 9. Dryer; 10. Filtration and cleaning system; 11. Process tower; 12. Esterification vacuum machine; 13. Prepolymerization scraped condenser; 14. Prepolymerization vacuum machine; 15. Final polycondensation scraped condenser; 16. Final polycondensation vacuum machine; 17. Spray tower; 18. THF recovery system; 19. Stripping tower; 20. Thermal medium incinerator. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] According to an embodiment of the present invention, a novel modular process system for preparing PBAT is provided.

[0049] like Figure 1 As shown, a novel modular PBAT preparation process system according to an embodiment of the present invention includes a slurry mixing tank 1. One side of the slurry mixing tank 1 is connected to an esterification tank A2 via a pipe. One side of the esterification tank A2 is connected to an esterification tank B3 via a pipe. One side of the esterification tank B3 is connected to a pre-polymerization reactor 4 via a pipe. One side of the pre-polymerization reactor 4 is connected to a filter tank 5 via a pipe. The filter tank 5 is connected to a polymerization reactor 6 via a pipe. One side of the polymerization reactor 6 is connected to a final polymerization reactor 7 via a pipe. One side of the final polymerization reactor 7 is connected to a pelletizer 8 via a pipe. One side of the pelletizer 8 is connected to a dryer 9 via a pipe.

[0050] A filter cleaning system 10 is provided on one side of the filter tank 5;

[0051] One side of esterification reactor A2 and esterification reactor B3 are respectively connected to process tower 11 via pipeline, and one side of process tower 11 is connected to esterification vacuum machine 12 via pipeline.

[0052] Prepolymerization reactor 4 and prepolymerization reactor 6 are respectively connected to prepolymerization scraper condenser 13 through pipes, and a prepolymerization vacuum machine 14 is connected to one side of prepolymerization scraper condenser 13 through a pipe.

[0053] A final polycondensation reactor 7 is connected to a final polycondensation scraper condenser 15 via a pipe on one side, and a final polycondensation vacuum machine 16 is connected to a final polycondensation scraper condenser 15 via a pipe on one side.

[0054] The pre-polycondensation vacuum machine 14 and the final polycondensation vacuum machine 16 are connected with the spray tower 17 on one side through a pipeline, the spray tower 17 is connected with the THF recovery system 18 on one side through a pipeline, the THF recovery system 18 is connected with the stripping tower 19 on one side through a pipeline, and the stripping tower 19 is connected with the heat medium incinerator 20 on one side through a pipeline;

[0055] The esterification vacuum machine 12 is connected with the spray tower 17 through a pipeline, and the spray tower 17 is connected with the heat medium incinerator 20 through a pipeline.

[0056] The utility model discloses a novel modular preparation PBAT process system, including slurry blending kettle 1, esterification kettle A 2, esterification kettle B 3, pre -polycondensation reactor 4, filter groove 5, polycondensation reactor 6, final polycondensation reactor 7, pelletizer 8, dryer 9, filter cleaning system 10, process tower 11, esterification vacuum machine 12, pre -polycondensation scraper condenser 13, pre -polycondensation vacuum machine 14, final polycondensation scraper condenser 15, final polycondensation vacuum machine 16, spray tower 17, THF recovery system 18, stripping tower 19, heat medium incinerator 20.

[0057] Slurry blending kettle 1 is connected with esterification kettle A 2 through a pipeline, and esterification kettle A 2 is connected with esterification kettle B 3 and pre -polycondensation reactor 4 in proper order. Polycondensation reactor 6 and final polycondensation reactor 7 are connected in series through a pipeline, and are provided with a perfect vacuum system to provide stable low pressure environment.

[0058] THF recovery system 18 is connected with process tower 11 and spray tower 17 and is used for recycling by -product generated in the polycondensation process. Stripping tower 19 is used for further processing process tail gas, and tail gas is finally treated through heat medium incinerator 20, reduces pollutant emission. Product passes through final polycondensation reactor 6 and enters filter groove 5 to remove impurities and then enters polycondensation reactor 6 and final polycondensation reactor 7, and then enters pelletizer 8 and dryer 9 in proper order, and finally high -purity PBAT product is obtained.

[0059] The working process of the system mainly includes the following links:

[0060] Raw material mixing and pre -reaction: butanediol, adipic acid, terephthalic acid and catalyst are added in slurry blending kettle 1 in proportion and mix, and enter esterification kettle A 2 and esterification kettle B 3 in proper order and carry out esterification reaction, generate intermediate product.

[0061] Polycondensation reaction and purification: intermediate product passes through pre -polycondensation reactor 4, polycondensation reactor 6 and final polycondensation reactor 7 and is polymerized in stages, and vacuum system is used in the polymerization process to reduce reaction temperature and promote by -product to volatilize, improve polymerization efficiency and product purity.

[0062] By -product recovery and tail gas treatment: by -product is recycled through process tower 11 and spray tower 17, and uncondensed tail gas enters stripping tower 19 and heat medium incinerator 20 and is treated, satisfies environmental protection requirement.

[0063] Product forming: after the polymerization product removes impurities through the filter tank 5, it is processed through the granulator 8 and the dryer 9 in turn, and finally the PBAT product meeting the specifications is obtained.

[0064] The utility model discloses a modular process design, realizes the reaction optimization and resource efficient use in the PBAT preparation process.

[0065] The esterification kettle A2 and esterification kettle B3 are respectively equipped with material feeding port, the slurry blending kettle 1 is connected with vacuum system through pipeline, and the vacuum system is used for reducing the reaction pressure of esterification and polycondensation reaction, promotes the volatile of by -product and improves the reaction efficiency, and the final polycondensation reactor 7 is connected with filter tank 5 through pipeline, and the filter tank 5 is used for removing residual impurities in reaction product;

[0066] Process column 11, spray tower 17 and THF recovery system 18 are connected in series, process column 11 is used for recycling volatile by-products generated in esterification and polycondensation reaction, spray tower 17 further processes tail gas to reduce emission, and THF recovery system 18 is used for recycling four hydrogen furan and recycling;

[0067] Tail gas finally enters heat medium incinerator 20 through stripping tower 19, and reaches environmental protection emission standard after incineration treatment;

[0068] The dryer 9 includes a dehydrator and a drying machine, and the drying machine is connected with the final polycondensation reactor 7 through airtight pipeline and is used for further removing moisture and volatile impurities in the PBAT product.

[0069] In some aspects, the slurry blending kettle 1 and the esterification kettle A2 are both provided with a half-pipe jacket, and a heat-conducting medium is circulated in the half-pipe jacket to control the reaction temperature.

[0070] In some aspects, the process column 11 and the spray tower 17 are connected with a condensing device, and the gas not condensed in the condensing device is discharged through a tail gas treatment system.

[0071] In some aspects, the vacuum system includes a vacuum pump set and a condensing device, which is used for efficiently recovering volatile by-products and providing a stable reaction environment.

[0072] In some aspects, the THF recovery system 18 includes a cooler and a storage tank, the cooler is used for condensing and recovering four hydrogen furan, and the storage tank is used for collecting and recycling the recovered four hydrogen furan.

[0073] In some aspects, the filter tank 5 is provided with multiple layers of filtering devices to remove oligomers and insoluble impurities, thereby improving the purity of the PBAT product.

[0074] Industrial production of high-purity PBAT usually adopts an esterification and polycondensation combined process, and the design idea of the utility model is mainly

[0075] The following three links are included:

[0076] ① Optimal design of esterification reaction link:

[0077] The utility model discloses a reasonable material conveying system is arranged between slurry blending kettle 1 and esterification kettle A2 and esterification kettle B3, and the raw material ratio is controlled through accurate metering device. After slurry blending kettle 1 mixes butanediol, adipic acid, terephthalic acid and catalyst evenly, it enters esterification kettle A2 and esterification kettle B3 in turn and carries out cascade esterification reaction. In the esterification process, the system is provided with a vacuum system and a tail gas condensing device, which ensures that the reaction pressure is reduced, promotes the efficient volatilization of reaction products and other volatile by-products, and recovers through a condenser to reduce raw material waste. After esterification, the generated intermediate product has high purity and stability.

[0078] ② Innovative configuration of polycondensation reaction link:

[0079] In the polycondensation reaction process, the utility model discloses a pre-polycondensation reactor 4, a polycondensation reactor 6 and a final polycondensation reactor 7, which are continuously conveyed between each other, avoiding pollution and interruption during the reaction. In order to further improve the polymerization efficiency and product purity, the polycondensation reactor 6 and the final polycondensation reactor 7 are both equipped with a half-pipe jacket, and the circulating heat conducting medium can accurately control the temperature change according to the reaction stage. In addition, the vacuum system provides a stable low-pressure environment during the polycondensation stage, accelerates the volatilization of by-products, and inhibits the occurrence of side reactions, thereby improving the uniformity of PBAT molecular weight and the degree of polymerization.

[0080] ③ Efficient recovery of by-products and product refining link:

[0081] In order to realize environmental protection and resource utilization, the utility model discloses a process tower 11, a spray tower 17 and a THF recovery system 18, the process tower 11 separates and recovers the volatile by-products in the reaction tail gas, the spray tower 17 further purifies the tail gas through circulating liquid, the THF recovery system 18 efficiently recovers tetrahydrofuran for recycling, reducing raw material consumption and environmental pollution. During the product refining process, the PBAT final product removes impurities through the filter tank 5, and the pelletizing and drying system further removes moisture and volatile substances, finally obtaining high-performance PBAT products with uniform particle size and high purity.

[0082] In addition, all the reactors in the utility model are designed to be closed, which significantly reduces the emission of odor and pollutants, and greatly improves the operating environment. All the reaction kettles and storage tanks are equipped with weighing sensors and electric control valves to realize accurate control of material metering and feeding. The overall structure of the system is modular, and the process flow is automated and intelligent, which not only meets the needs of large-scale production, but also ensures the safety of operation and the stability of product quality.

[0083] Compared with the prior art, the utility model has the advantages of the following:

[0084] 1. High by-product recovery rate, reduces raw material consumption;

[0085] 2. Accurate control of reaction process temperature and pressure, uniform product purity and molecular weight distribution;

[0086] 3. High degree of automation of process flow, suitable for large-scale industrial production of PBAT with environmental protection and high efficiency.

[0087] The above only describes the preferred embodiments of the utility model and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A novel modular PBAT production process system characterized in that, It includes slurry preparation kettle (1), one side of slurry preparation kettle (1) is connected with esterification kettle A (2) through pipeline, one side of esterification kettle A (2) is connected with esterification kettle B (3) through pipeline, one side of esterification kettle B (3) is connected with pre-polycondensation reactor (4) through pipeline, one side of pre-polycondensation reactor (4) is connected with filter tank (5) through pipeline, filter tank (5) is connected with polycondensation reactor (6) through pipeline, one side of polycondensation reactor (6) is connected with final polycondensation reactor (7) through pipeline, one side of final polycondensation reactor (7) is connected with granulator (8) through pipeline, one side of granulator (8) is connected with dryer (9) through pipeline.

2. A novel modular PBAT preparation process system according to claim 1, characterized by, One side of the filter tank (5) is provided with a filter cleaning system (10).

3. A novel modular PBAT preparation process system according to claim 2, characterized by, One side of the esterification kettle A (2) and esterification kettle B (3) is respectively connected with process column (11) through pipeline, one side of process column (11) is connected with esterification vacuum machine (12) through pipeline.

4. A novel modular PBAT preparation process system according to claim 3, characterized by, The pre-polycondensation reactor (4) and polycondensation reactor (6) are respectively connected with pre-polycondensation scraper condenser (13) through pipeline, one side of pre-polycondensation scraper condenser (13) is connected with pre-polycondensation vacuum machine (14) through pipeline.

5. A novel modular PBAT preparation process system according to claim 4, characterized in that, One side of the final polycondensation reactor (7) is connected with the final polycondensation scraper condenser (15) through the pipeline, one side of the final polycondensation scraper condenser (15) is connected with the final polycondensation vacuum machine (16) through the pipeline.

6. A novel modular PBAT preparation process system according to claim 5, characterized in that, One side of the pre-polycondensation vacuum machine (14) and the final polycondensation vacuum machine (16) is connected with the spray tower (17) through the pipeline, one side of the spray tower (17) is connected with the THF recovery system (18) through the pipeline, one side of the THF recovery system (18) is connected with the stripping tower (19) through the pipeline, one side of the stripping tower (19) is connected with the heat medium incinerator (20) through the pipeline.

7. A novel modular PBAT preparation process system according to claim 6, characterized by, The esterification vacuum machine (12) is connected with the spray tower (17) through the pipeline, and the spray tower (17) is connected with the heat medium incinerator (20) through the pipeline.

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