Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Patent
1995-12-14
1998-12-22
Geist, Gary
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
568617, 203 91, C07C 4104
Patent
active
058522182
ABSTRACT:
A method for converting the diester of a polyether polyol (e.g., the diacetate ester of polytetramethylene ether, PTMEA) to a corresponding dihydroxy polyether polyol (e.g., polytetramethylene ether glycol, PTMEG) involving reactive distillation wherein a diester of polyether polyol is fed to the top portion of the column along with an effective amount of at least one alkali metal oxide or alkaline earth metal oxide, hydroxide or alkoxide catalyst (e.g., sodium methoxide) and with a C.sub.1 to C.sub.4 alkanol (e.g., methanol) while simultaneously adding to the bottom of the reactive distillation column hot alkanol vapor to sweep any alkanol ester formed by alkanolysis of the diester of polyether polyol upwardly. Such a process is useful for achieving high levels of conversion PTMEA to PTMEG on a commercial scale with the overhead from the column being amenable to azeotropic separation of the methyl acetate and recycle of the methanol.
REFERENCES:
patent: 4163115 (1979-07-01), Heinsohn et al.
patent: 4230892 (1980-10-01), Pruckmayr
patent: 4510333 (1985-04-01), Pruckmayr
patent: 4584414 (1986-04-01), Pruckmayr
patent: 5282929 (1994-02-01), Dorai et al.
patent: 5321181 (1994-06-01), Smith et al.
E. I. Du Pont de Nemours and Company
Geist Gary
Padmanabhan Sreeni
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