Cradle to Consumer
Identity ID
6f3471fe-7ddb-4d64-b0b9-607f2c8e3f51
Materials
Associated ID
f968c43a-f6a0-4c05-b486-4b5ded929479
Included activities starts
Included activities ends
Description
This is a market dataset representing the consumption market in the region. It includes transportation of the product from the factory gate to consumption, with transport services calculated according to the regional transportation conditions for the product.
Activity Description
The production of PET sheet includes polymerization-chipping unit, solid-phase polymerization unit, and sheet production unit. The production process of the polymerization-chip unit consists of PTA conveying, slurry preparation, esterification reaction, polycondensation reaction, and chipping. The production process of the solid-phase polymerization unit includes preheating and dedusting, hot conveying, solid-phase polymerization, chip cooling, conveying, and nitrogen purification. The sheet production unit includes molten polymer conveying, chip heating and extrusion, forming and cooling, winding, edge trimming, and warehousing.
Process Description
Polyethylene terephthalate (PET) resin is a milky white or light yellow, highly crystalline polymer with a smooth and glossy surface. This product is in the form of PET sheets, primarily used as bottle flakes and functional sheets (such as optical sheets, antistatic sheets, etc.).
Time period
2019
2026
Geography
China,Xizang Autonomous Region
Macroeconomic value
Business-as-Usual
Data validation
Yes
Technology
Current Technology
Technology comment
The process technology of direct esterification and continuous polycondensation uses purified terephthalic acid and ethylene glycol as main raw materials and antimony glycolate as the catalyst. The polyester production line adopts a five-reactor configuration, including the first esterification, second esterification, first pre-polycondensation, second pre-polycondensation, and final polycondensation reactors. The principle of polyester solid-state polycondensation (SSP) technology is to further increase the molecular weight and intrinsic viscosity of polyester through additional polycondensation. The reaction mechanism involves chain growth of PET chips in a solid state under high-temperature nitrogen atmosphere, during which small-molecule by-products such as ethylene glycol, water, and acetaldehyde are removed by the nitrogen stream. Due to the presence of numerous terminal carboxyl and hydroxyl groups in the PET molecular chain, effective activation of terminal carboxyl or hydroxyl groups can be initiated below the melting temperature, leading to a condensation reaction that increases the PET chain length and viscosity, thus yielding a product with higher molecular weight.