Method and device for the production of polytrimethylene...

Details Method and device for the production of polytrimethylene... Method and device for the production of polytrimethylene...

2007-05-29

2007-05-29

Oh, Taylor Victor (Department: 1625)

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

C528S271000

Reexamination Certificate

active

10477792

ABSTRACT:
In a process for producing polytrimethylene terephthalate by esterification of terephthalic acid with 1,3-propanediol and polycondensation, the vapors formed are rectified , the liquid phase is recirculated to the process, and the lower-boiling components are condensed. To obtain an almost completely stripped condensate, the condensate is circulated and stripped with air and the exhaust air is subjected to a catalytic oxidation.

REFERENCES:
patent: 3127377 (1964-03-01), Lindenauer
patent: 5259931 (1993-11-01), Fox
patent: 5459229 (1995-10-01), Kelsey et al.
patent: 5599900 (1997-02-01), Bhatia
patent: 6512080 (2003-01-01), Kelsey et al.
patent: WO 98/49216 (1998-11-01), None
patent: WO 00 44809 (2000-08-01), None
PTT Polytrimethylene Terephthalate Process, brochure of mg engineering, Lurgi Zimmer AG, Apr. 1999.

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