摘要 |
<p>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.</p> |
申请人 |
E.I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
ENG, JOHN, HARVEY;BLUM, EMILY A.;GREEN, DANIEL ALBERT;GIARDINO, CARL J.;PARRISH, GENE;TROTTER, ROBERT E.;WILSON, GARY J. |