Poly(trimethylene therephthalate) continuous manufacturing process
This invention relates to a continuous process for production of poly(trimethylene terephthalate), wherein gaseous 1,3-propanediol by product resulting from the process is condensed in a condenser, and a portion of the condensed by-product is recycled to the condenser while anther portion is recycled back into the process.
E. I. du Pont de Nemours and Company
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Gene Gary J. John Harvey Daniel Albert Robert E. Emily A.
Parrish Wilson Eng Green Trotter Blum