Which is better, the domestic polyester production process or DuPont’s process in the United States?
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Which is better, the domestic polyester production process or DuPont’s process in the United States? Let’s discuss it from various aspects
We do an excellent job in polyester and synthetic fibers; feel free to contact me if you have any projects
The one upstairs is from Dalian; the spinning department at the Synthetic Fiber Research Institute is indeed good, hehe
Currently, the Gemma process is basically used in China, involving four reactors; the reaction temperature is low, resulting in low energy consumption. DuPont’s three-reactor process features high esterification temperatures, high energy consumption, and high usage of EG.
Reply to 4# keeyna: Brother, did you travel back in time from over 10 years ago?
In China, the technology is mostly imported from abroad
The China Textile Research Institute is also very strong; there’s so much work that they can’t keep up
How did Gemma’s become four pots? DuPont’s energy consumption has become extremely high; dude, go look up some information first before you talk about it!
Reply 1# laoshiling: The designs developed by the China Textile Research Institute are mainly for five reactors, and the control requirements are not as high as those for DuPont. In my department, I’m in charge of five reactors, and our factory also has DuPont’s equipment.
The DuPont process is a three-reactor system; the additive feeding point is equipped with nozzles and static mixers, which ensures good dispersion. However, due to its simple process flow and short residence time, strict control over temperature and pressure is required. The Gemma process involves a five-reactor sequence, ensuring sufficient reaction time for both esterification and polycondensation. The esterification reaction takes place at a relatively low temperature of around 260 degrees, with a long residence time; this results in stable operation and few by-products in the product, especially a low level of DEG. A single polycondensation catalyst is selected.