CN210945446U

CN210945446U - Full-continuous PBAT production equipment

Info

Publication number: CN210945446U
Application number: CN201921962765.8U
Authority: CN
Inventors: 余国清; 郝瑞强; 刘勇; 严玉; 殷杰; 刘林; 李广志
Original assignee: Polytex Chemical Engineering Co ltd
Current assignee: Polytex Chemical Engineering Co ltd
Priority date: 2019-11-14
Filing date: 2019-11-14
Publication date: 2020-07-07
Anticipated expiration: 2029-11-14

Abstract

The utility model relates to a novel full continuous PBAT's production facility, including batching making beating cauldron, esterification reaction cauldron, pre-polycondensation reaction cauldron, final polycondensation reaction cauldron, cut grain system. The top of the batching and pulping kettle is connected with a Poly Terephthalic Acid (PTA) bin and an Adipic Acid (AA) bin, and the bottom of the batching and pulping kettle is connected with the top of the esterification reaction kettle through a slurry delivery pump; the gas phase at the top of the esterification kettle is connected with the middle part of the process tower, and the middle part of the esterification kettle is connected with the pre-polycondensation reaction kettle through an esterified matter delivery pump; the bottom of the pre-polycondensation reaction kettle is connected with the final polycondensation reaction kettle through a prepolymer conveying pump and a prepolymer filter; and the final polycondensation reaction kettle is connected with the granulating system through a melt conveying pump and a melt filter. The utility model discloses compact structure, reasonable in process, degree of automation is high, and product quality is stable, operation safety and stability.

Description

Full-continuous PBAT production equipment

Technical Field

The utility model belongs to the full biodegradable materials field of polymer trade, especially relate to a production facility of full continuous PBAT.

Background

PBAT chinese name: polybutylene terephthalate adipate (PBAT) belongs to the all biodegradable polyester. The PBAT product has excellent comprehensive performance and reasonable cost performance, can be used in the fields of packaging, tableware, cosmetic bottles, medicine bottles, disposable medical supplies, agricultural films, pesticides, fertilizer slow release materials, biomedical polymer materials and the like, has extremely wide application and good application and popularization prospects, and has outstanding application and popularization prospects in biodegradable plastic materials. PBAT is degraded only under the condition that compost, water body and the like contact with specific microorganisms, and the performance is very stable in the normal storage and use processes; compared with other biodegradable plastics, the PBAT has very excellent mechanical property which is close to PP and ABS plastics; the PBAT has very good processability, can be subjected to various molding processing on the existing plastic processing general equipment, is the best in the processing performance of the existing degradable plastics, and simultaneously, the PBAT can be blended with a large amount of fillers such as calcium carbonate, starch, polylactic acid and the like to obtain a low-price degradable plastic product.

According to the State development and reform Committee "industry Structure adjustment guide catalog" (2019 this, solicit the draft), this product is full biodegradable polyester polybutylene terephthalate adipate (PBAT), belongs to the development and the production of degradable polymer, according to "3 rd class encourages the development of type" in "catalog" and fibrous development, production and application ", the utility model belongs to the industry encourages the type. The development of a PBAT device which can continuously and stably operate and has stable product quality is urgently needed by the industry.

SUMMERY OF THE UTILITY MODEL

The utility model aims at achieving the above purpose, and provides a production device and a process flow of full-continuous PBAT with reasonable process, high automation degree, high production efficiency, stable product quality and safe and stable operation.

The purpose of the utility model is realized like this:

a full-continuous PBAT production device comprises a pulping system for carrying out mixed pulping on AA raw materials and PTA materials, an esterification reaction system for carrying out esterification reaction on the mixed pulp, a polycondensation reaction system for carrying out pre-polycondensation and final polycondensation reaction on the finished raw materials, and a grain cutting system for melting and cutting grains on the raw materials subjected to pre-polycondensation and final polycondensation, and is characterized in that the pulping system comprises an AA bin, a PTA bin, an AA metering device, a PTA metering device and a batching and pulping kettle, wherein the AA bin and the PTA bin are arranged in a left-right alignment manner, the AA metering device is arranged at the discharge port of the AA bin and is used for metering the discharge amount of the AA bin, the PTA metering device is arranged at the discharge port of the PTA bin and is used for metering the discharge amount of the PTA bin, and the batching and pulping kettle is arranged right below the AA bin and the PTA bin, the top of the batching and pulping kettle is communicated with discharge ports of the AA bin and the PTA bin through pipelines;

the esterification reaction system comprises an esterification reaction kettle, a process tower, a recycling BDO pump and an esterified substance delivery pump, wherein the esterification reaction kettle is arranged on the right side of a blending and pulping kettle, a slurry delivery pump is arranged between the esterification reaction kettle and the blending and pulping kettle, the blending and pulping kettle delivers slurry to the esterification reaction kettle through the slurry delivery pump, the process tower is arranged on the right side of the esterification reaction kettle, the gas phase of the esterification reaction kettle is communicated with the middle part of the process tower, gas generated by the esterification reaction kettle is delivered to the middle part of the process tower through a pipeline, the process tower separates the gas, water vapor and BDO are separated, the water vapor is discharged through a gas outlet at the upper part of the process tower, and the BDO is delivered back to the esterification reaction kettle again through the recycling BDO pump arranged right below the process tower;

the polycondensation reaction system comprises a pre-polycondensation reaction kettle, a prepolymer delivery pump, a prepolymer filter, a final polycondensation reaction kettle, a melt delivery pump and a melt filter, wherein the pre-polycondensation reaction kettle is arranged on the right side of the process tower, the middle part of the pre-polycondensation reaction kettle is communicated with the middle part of the esterification reaction kettle through an esterified product delivery pump, the esterified product delivery pump is used for delivering esterified raw materials in the esterification reaction kettle to the pre-polycondensation reaction kettle for pre-polycondensation reaction, the prepolymer filter is arranged on the right side of the pre-polycondensation reaction kettle, the bottom of the prepolymer filter is communicated with the bottom of the pre-polycondensation reaction kettle through the prepolymer delivery pump, the prepolymer filter is used for filtering the raw materials delivered by the pre-polycondensation reaction kettle, the final polycondensation reaction kettle is arranged on the right side of the prepolymer filter, and the prepolymer filter is communicated with the bottom of the front end of the final polycondensation reaction kettle through a pipeline, the prepolymer filter conveys the filtered raw materials to a final polycondensation reaction kettle through a pipeline for final polycondensation reaction, the melt filter is arranged right below the final polycondensation reaction kettle, the bottom of the rear end of the final polycondensation reaction kettle is communicated with the melt filter through a melt conveying pump, the melt filter is used for filtering the final polycondensation reaction melt raw materials conveyed out of the final polycondensation reaction kettle, the grain cutting system is arranged on the right side of the melt filter, the melt filter is communicated with the grain cutting system, and the grain cutting system performs granulation on the raw material melt conveyed out of the melt filter;

further, an AA bin and a PTA bin are respectively metered by an AA metering device and a PTA metering device and then are simultaneously added into the batching and pulping kettle according to a certain proportion with the metered BDO, so that full-automatic slurry preparation is realized and the slurry is continuously sent out;

further, a catalyst adding port is arranged on a pipeline connecting the recycling BDO pump and the esterification reaction kettle, and the catalyst is added into the esterification reaction kettle through the catalyst adding port;

furthermore, the final polycondensation reactor is a double-shaft disc stirring vacuum reactor, and a plurality of film forming discs are arranged on two stirring shafts to form two disc stirring systems, so that the viscosity of the PBAT product can be conveniently adjusted.

Compared with the prior art, the beneficial effects of the utility model reside in that:

the utility model discloses compact structure, reasonable in process, degree of automation is high, and production efficiency is high, product quality is stable, operation safety and stability. The catalyst is added from the bottom, so that the dispersion of the catalyst is promoted, and the probability of the catalyst decomposing in water is reduced; the final polycondensation reaction kettle adopts a biaxial system, so that the viscosity of the PBAT product can meet higher requirements.

Drawings

Fig. 1 is a schematic flow chart of the present invention.

Wherein, 1, an adipic acid bin; 2. a terephthalic acid bin; 3. an Adipic Acid (AA) metering device; 4. a terephthalic acid (PTA) metering device; 5. a material blending and pulping kettle; 6. a slurry delivery pump; 7. an esterification reaction kettle; 8. a process tower; 9. recycling the BDO pump; 10. an esterification product transfer pump; 11. a pre-polycondensation reaction kettle; 12. a prepolymer delivery pump; 13. a prepolymer filter; 14. a final polycondensation reaction kettle; 15. a melt transfer pump; 16. a melt filter; 17. and a pelletizing system.

Detailed Description

As shown in fig. 1, the blending and beating system in the production equipment and process flow of the fully continuous PBAT shown in fig. 1 comprises an adipic acid bin 1, a terephthalic acid bin 2, an adipic acid metering device 3 connected with the adipic acid bin, a PTA metering device 4 connected with the terephthalic acid bin, a blending and beating kettle 5, and the beaten slurry is sent to the esterification reaction kettle through a slurry conveying pump 6.

As shown in figure 1, in the fully continuous PBAT production equipment and the esterification reaction kettle system in the process flow, slurry from a batching and pulping kettle 5 enters an esterification reaction kettle 7 for esterification reaction, the reaction temperature is controlled at 220-240 ℃, the reaction pressure is 30-90 KPa (A), a catalyst and reflux BDO are added at the bottom of the reaction kettle, and an esterified product is conveyed to a pre-polycondensation reaction kettle 11 through an esterified product conveying pump 10. The water produced by the esterification, tetrahydrofuran and a large amount of BDO are separated by a gas phase pipeline to a process tower 8.

As shown in figure 1, a full-continuous PBAT production device and a polycondensation reaction kettle system and a pelletizing system in a process flow comprise a pre-polycondensation reaction kettle 11, after an esterified product enters the pre-polycondensation reaction kettle, a pre-polycondensation reaction is carried out, the reaction temperature of the pre-polycondensation reaction kettle is controlled to be 230-250 ℃, the reaction pressure is 1-20 KPa (A), and a reacted prepolymer passes through a prepolymer conveying pump 12, is filtered by a prepolymer filter 13, and enters a final polycondensation reaction kettle 14. And (3) after the prepolymer enters a final polycondensation reaction kettle, carrying out final polycondensation reaction, wherein the reaction temperature is controlled to be 230-250 ℃, and the reaction pressure is 0.02-1 KPa (A). The melt after reaction has high viscosity, is conveyed by a melt conveying pump 15, is filtered by a melt filter 16, and is sent to a granulating system 17 for granulation.

The present invention is not limited to the above embodiments, and based on the technical solutions disclosed in the present invention, those skilled in the art can make some replacements and transformations for some technical features without creative labor according to the disclosed technical contents, and these replacements and transformations are all within the protection scope of the present invention.

Claims

1. A full-continuous PBAT production device comprises a pulping system for carrying AA raw materials and PTA materials for mixing and pulping, and further comprises an esterification reaction system for carrying out esterification reaction on the mixed pulp, a polycondensation reaction system for carrying out pre-polycondensation and final polycondensation reaction on the finished raw materials, and a granulating system (17) for melting and granulating the raw materials subjected to pre-polycondensation and final polycondensation, and is characterized in that the pulping system comprises an AA storage bin (1), a PTA storage bin (2), an AA metering device (3), a PTA metering device (4) and a batching pulping kettle (5), the AA storage bin (1) and the PTA storage bin (2) are arranged in a left-right alignment manner, the AA metering device (3) is arranged at the discharge port of the AA storage bin (1), the AA metering device (3) is used for metering the discharge amount of the AA storage bin (1), and the PTA metering device (4) is arranged at the discharge port of the PTA storage bin (2), the PTA metering device (4) is used for metering the discharge amount of the PTA bin (2), the batching and pulping kettle (5) is arranged right below the AA bin (1) and the PTA bin (2), and the top of the batching and pulping kettle (5) is communicated with the discharge ports of the AA bin (1) and the PTA bin (2) through pipelines;

the esterification reaction system comprises an esterification reaction kettle (7), a process tower (8), a recycling BDO pump (9) and an esterified substance delivery pump (10), wherein the esterification reaction kettle (7) is arranged on the right side of a blending and beating kettle (5), a slurry delivery pump (6) is arranged between the esterification reaction kettle (7) and the blending and beating kettle (5), the blending and beating kettle (5) delivers slurry into the esterification reaction kettle (7) through the slurry delivery pump (6), the process tower (8) is arranged on the right side of the esterification reaction kettle (7), the gas phase of the esterification reaction kettle (7) is communicated with the middle part of the process tower (8), gas generated by the esterification reaction kettle (7) is delivered to the middle part of the process tower (8) through a pipeline, the process tower (8) separates the gas, water vapor and BDO are separated, the water vapor is discharged through a gas outlet at the upper part of the process tower (8), the BDO is conveyed back to the esterification reaction kettle (7) again through a recycling BDO pump (9) arranged right below the process tower (8);

the polycondensation reaction system comprises a pre-polycondensation reaction kettle (11), a prepolymer delivery pump (12), a prepolymer filter (13), a final polycondensation reaction kettle (14), a melt delivery pump (15) and a melt filter (16), wherein the pre-polycondensation reaction kettle (11) is arranged on the right side of a process tower (8), the middle part of the pre-polycondensation reaction kettle (11) is communicated with the middle part of an esterification reaction kettle (7) through an esterified substance delivery pump (10), the esterified substance delivery pump (10) is used for delivering raw materials which are esterified in the esterification reaction kettle (7) to the pre-polycondensation reaction kettle (11) for pre-polycondensation reaction, the prepolymer filter (13) is arranged on the right side of the pre-polycondensation reaction kettle (11), the bottom of the prepolymer filter (13) is communicated with the bottom of the pre-polycondensation reaction kettle (11) through the prepolymer delivery pump (12), and the prepolymer filter (13) is used for filtering the raw materials delivered from the pre-polycondensation reaction kettle (11), the final polycondensation reaction kettle (14) is arranged on the right side of the prepolymer filter (13), the prepolymer filter (13) is communicated with the bottom of the front end of the final polycondensation reaction kettle (14) through a pipeline, the prepolymer filter (13) conveys the filtered raw materials to a final polycondensation reaction kettle (14) through a pipeline for final polycondensation reaction, the melt filter (16) is arranged right below the final polycondensation reaction kettle (14), the bottom of the rear end of the final polycondensation reaction kettle (14) is communicated with the melt filter (16) through a melt delivery pump (15), the melt filter (16) is used for filtering the melt raw material of the final polycondensation conveyed by the final polycondensation reaction kettle (14), the pelletizing system (17) is arranged on the right side of the melt filter (16), the melt filter (16) is communicated with the pelletizing system (17), and the granulating system (17) is used for granulating the raw material melt conveyed out by the melt filter (16).

2. The fully continuous PBAT production plant according to claim 1, characterized in that: the AA bin (1) and the PTA bin (2) are respectively metered by the AA metering device (3) and the PTA metering device (4) and then are simultaneously added into the batching and pulping kettle (5) according to a certain proportion with the metered BDO, so that full-automatic slurry configuration is realized and continuous delivery is realized.

3. The fully continuous PBAT production plant according to claim 1, characterized in that: and a catalyst adding port is arranged on a pipeline for connecting the recycling BDO pump (9) and the esterification reaction kettle (7), and the catalyst is added into the esterification reaction kettle (7) through the catalyst adding port.

4. The fully continuous PBAT production plant according to claim 1, characterized in that: the final polycondensation reactor (14) is a double-shaft disc stirring vacuum reactor, and a plurality of film forming discs are arranged on two stirring shafts to form two disc stirring systems, so that the viscosity of a PBAT product can be conveniently adjusted.