On November 26, the second announcement of public participation in the 240,000-ton/year polyester biodegradable resin project of Xinjiang Wigerui Biotechnology Co., Ltd. release.
This project is planned to be constructed in two phases.In the first phase, two polyester biodegradable resin production facilities with an annual output of 60,000 tons will be built. In the second phase, a polyester biodegradable resin production facility with an annual output of 120,000 tons will be built, and a 110kV substation, circulating water station, heat medium station, air compressor refrigeration station, heat exchange station, raw material warehouse, and finished product will be built at the same time Auxiliary facilities such as warehouses and raw material tank farms, office and living facilities, inspection and maintenance centers, central control buildings and analysis and testing centers rely on Lanshan Tunhe Polyester Co., Ltd.'s existing facilities.
Main product PBAT
Using continuous polymerization of purified terephthalic acid (hereinafter referred to as PTA), adipic acid (hereinafter referred to as AA) and butanediol (hereinafter referred to as BDO) Methods to produce PBAT.
PBAT is a thermoplastic biodegradable plastic, which is a copolymer of butylene adipate and butylene terephthalate. It has both PBA and The characteristics of PBT are not only good ductility and elongation at break, but also good heat resistance and impact performance; in addition, it also has excellent biodegradability, which is very active in the research of biodegradable plastics and the most widely used in the market. One of the best degradable materials.
PBAT is a promising copolyester product with good film performance, excellent flexibility and biodegradability, and its thermal stability Good and excellent mechanical properties. It can be processed in various forms such as injection molding, extrusion molding, blow molding, etc., and is widely used in sheet, mulch, packaging, foaming and other places.
Main product PBS
PBS fully biodegradable resin is produced by continuous polymerization method with succinic acid (hereinafter referred to as SA) and butanediol (hereinafter referred to as BDO).
PBS resin is milky white, odorless and tasteless, easily decomposed and metabolized by various microorganisms in nature or enzymes in animals and plants, and finally decomposed into carbon dioxide and water , is a typical fully biodegradable polymer material.
PBS has a density of 1.26g/cm3 and a melting point of 114°C. According to the molecular weight and molecular weight distribution, the crystallinity is 30~45%. The performance of PBS is between polyethylene and polypropylene, and it can be directly used as plastic processing.
PBS has good heat resistance, and its heat distortion temperature is close to 100°C. After modification, the service temperature can exceed 100°C. It overcomes the shortcomings of low heat-resistant temperature of other biodegradable plastics; it has good processing performance and can be used for extrusion, injection molding, blown film, blister and other molding processes on existing polyolefin general-purpose plastic processing equipment. Plastics have the best processing performance; at the same time, a large amount of fillers such as calcium carbonate and starch can be blended during processing to obtain products with relatively low prices.
Process Technology Scheme
The flexible design of the production equipment of the project can produce products including PBS, PBAT and PBSA. The 240,000 t/a polyester biodegradable resin project of this project adopts the continuous polymerization process of Jima three-pot.
General Process Description
The project adopts esterification-polymerization process for resin production.
The polyester biodegradable resin device consists of the following parts: raw material preparation, esterification, polycondensation, chip production, heat medium heating, BDO feeding, THF recovery, BDO recovery.
(1) Raw material preparation includes raw material PTA feed, AA feed, SA feed, additive addition, slurry preparation, etc.
(2) The esterification part includes the esterification reactor and its supporting equipment, such as the heat medium system for heating in this section, the process tower, and the liquid ring vacuum pump and its ancillary equipment.
(3) The polycondensation part includes pre-condensation reactors and finishing reactors and their supporting equipment, such as condensation,Spray condenser for separating vapor phase and its supporting equipment, equipment for generating vacuum, etc.
(4) The slice production part includes melt conveying, casting belt and pelletizing, slice cooling water circulation, slice storage and packaging, etc.
(5) Heat medium heating part includes heat medium furnace and its supporting equipment (low nitrogen burner, blower, etc.), heat medium circulating pump, heat medium Storage tanks, natural gas control equipment, etc.
(6) BDO feeding part includes BDO intermediate storage tank, BDO feeding pump, etc.
(7) The THF recovery part includes three THF rectification towers and their ancillary equipment (such as tower top condenser, tower bottom pump, etc.), THF storage cans etc.
(8) BDO recovery part includes jet pump, vacuum liquid ring pump, low boiling tower, etc.
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