发明名称 |
Continuous process for producing poly(trimethylene terephthalate) |
摘要 |
A continuous process for the production of poly(trimethylene terephthalate) is disclosed. According to the process, a liquid feed mixture comprising bis-3-hydroxypropyl terephthalate and/or low molecular weight polyesters of 1,3-propanediol and terephthalic acid, the liquid feed mixture having a mole ratio of propylene groups to terephthalate groups of 1.1 to 2.2 is fed to a flasher. A first stream of gaseous by-products is continuously vaporized and removed from the flasher, and a liquid flasher reaction product having a mole ratio of propylene groups to terephthalate groups of less than about 1.5 is continuously withdrawn from the flasher. The liquid flasher reaction product is continuously fed to a prepolymerizer where it is continuously polymerized to form a poly(trimethylene terephthalate) prepolymer and a second stream of gaseous by-products. Poly(trimethylene terephthalate) prepolymer having a relative viscosity of at least about 5 is continuously withdrawn from the prepolymerizer and continuously fed to a final polymerizer, where it is continuously polymerized to form a higher molecular weight poly(trimethylene terephthalate) and a third stream of gaseous by-products. Higher molecular weight poly(trimethylene terephthalate) having a relative viscosity of at least about 17 is continuously withdrawn from the final polymerizer.
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申请公布号 |
US6538076(B2) |
申请公布日期 |
2003.03.25 |
申请号 |
US20010057497 |
申请日期 |
2001.05.22 |
申请人 |
E. I. DU PONT DE NEMOURS AND COMPANY |
发明人 |
GIARDINO CARL J.;GRIFFITH DAVID B.;HO CHUNGFAH HOWARD;HOWELL JAMES M.;WATKINS MICHELLE HOYT |
分类号 |
C08F2/00;C08G63/183;C08G63/78;(IPC1-7):C08F2/00 |
主分类号 |
C08F2/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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