Organic compounds -- part of the class 532-570 series – Organic compounds – Carboxylic acid esters
Reexamination Certificate
2005-10-04
2005-10-04
Kumar, Shailendra (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Carboxylic acid esters
C560S091000, C562S089000, C562S092000, C562S103000
Reexamination Certificate
active
06951954
ABSTRACT:
A process for the continuous production of at least one of bis(3-hydroxypropyl) terephthalate and low molecular weight oligomers of 1,3-propanediol and terephthalic acid is disclosed. According to the process, preheated 1,3-propanediol (about 150° C. to about 200° C.) and preheated lower dialkyl esters of terephthalic acid (about 150° C. to about 220° C.) are combined in a mole ratio of about 1.2:1 to about 2.3:1 and fed to an ester exchange vessel where the mixture undergoes a continuous transesterification reaction. The liquid reaction mixture is continuously heated and mixed, at a temperature of about 215° C. to about 250° C., and a pressure of about 800 mm Hg to about 1,000 mm Hg. Gaseous reaction products are continuously separated from the liquid reaction mixture, and a stream of liquid reaction products containing bis(3-hydoxypropyl) terephthalate and low molecular weight oligomers of 1,3-propanediol and terephthalic acid is continuously removed from a base portion of the ester exchange vessel.
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Giardino Carl J.
Griffith David B.
Ho Chungfah Howard
Howell James M.
Watkins Michelle Hoyt
E.I. du Pont de Nemours and Company
Kuller Mark D.
Kumar Shailendra
Mayer Nancy S.
Shay Lucas K.
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