Continuous manufacture of poly(trimethylene terephthalate)
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, the total amount of any trimethylene terephthalate cyclic dimer and poly(trimethylene terephthalate) in the condensed by-product 1,3-propanediol is adjusted, and a portion of the condensed by-product is recycled to the condenser while another portion is recycled back into the process.
E. I. du Pont de Nemours and Company
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C08G Y10T
inventional additional
Gary J. Daniel Albert Emily A. John Harvey Gene Robert E. Carl J.
Wilson Green Blum Eng Parrish Trotter Giardino