Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2007-01-02
2007-01-02
Acquah, Samuel A. (Department: 1711)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C524S742000, C524S755000, C524S760000, C524S765000, C524S766000, C524S767000, C524S779000, C524S788000, C524S414000, C524S425000, C524S433000, C524S438000, C528S490000, C528S503000, C568S679000, C568S852000, C568S853000, C568S854000
Reexamination Certificate
active
11204713
ABSTRACT:
A process of manufacture of polytrimethylene ether glycol comprising:(a) polycondensing reactant comprising diol selected from the group consisting of 1,3-propanediol, 1,3-propanediol dimer and 1,3-propanediol trimer or mixtures thereof in the presence of acid polycondensation catalyst to form polytrimethylene ether glycol;(b) adding water to the polytrimethylene ether glycol to form an aqueous mixture;(c) heating the aqueous mixture to hydrolyze acid esters formed during the acid catalyzed polycondensation;(d) adding to the hydrolyzed aqueous mixture organic solvent that is miscible with polytrimethylene ether glycol to form (i) organic phase containing the polytrimethylene ether glycol and residual acid polycondensation catalyst from the polycondensing and (ii) aqueous phase;(e) separating the aqueous phase and the organic phase;(f) adding base to the separated organic phase to neutralize the residual acid polycondensation catalyst by forming salts of the residual acid polycondensation catalyst;(g) separating the organic phase into (i) liquid phase comprising the polytrimethylene ether glycol, the organic solvent and any residual water, and (ii) solid phase comprising the salts of the residual acid polycondensation catalyst and the base which is unreacted; and(h) removing the organic solvent and the residual water from the liquid phase to obtain polytrimethylene ether glycol.
REFERENCES:
patent: 5015789 (1991-05-01), Arntz et al.
patent: 5276201 (1994-01-01), Haas et al.
patent: 5284979 (1994-02-01), Haas et al.
patent: 5334778 (1994-08-01), Haas et al.
patent: 5364984 (1994-11-01), Arntz et al.
patent: 5364987 (1994-11-01), Haas et al.
patent: 5633362 (1997-05-01), Nagarajan et al.
patent: 5686276 (1997-11-01), Laffend et al.
patent: 5821092 (1998-10-01), Nagarajan et al.
patent: 5962745 (1999-10-01), Brossmer et al.
patent: 6140543 (2000-10-01), Brossmer et al.
patent: 6232511 (2001-05-01), Haas et al.
patent: 6235948 (2001-05-01), Sunkara et al.
patent: 6277289 (2001-08-01), Kurian et al.
patent: 6284930 (2001-09-01), Haas et al.
patent: 6297408 (2001-10-01), Haas et al.
patent: 6331264 (2001-12-01), Kurian et al.
patent: 6342646 (2002-01-01), Haas et al.
patent: 6608168 (2003-08-01), Ng
patent: 6720459 (2004-04-01), Sunkara et al.
patent: 2002/0007043 (2002-01-01), Sunkara et al.
patent: 2004/0030095 (2004-02-01), Sunkara et al.
patent: 2004/0225161 (2004-11-01), Sunkara et al.
patent: 2004/0260125 (2004-12-01), Seapan et al.
patent: 2005/0069997 (2005-03-01), Adkesson et al.
patent: 2005/0283028 (2005-12-01), Sunkara et al.
patent: 2004 182974 (2004-07-01), None
patent: 2004 352713 (2004-12-01), None
patent: WO 99/01496 (1999-01-01), None
patent: WO 2004/048440 (2004-06-01), None
patent: WO 2004/099110 (2004-11-01), None
Ng Howard C.
Sunkara Hari Babu
Zheng Wei
Acquah Samuel A.
E. I. du Pont de Nemours and Company
Kuller Mark D.
Lerman Bart E.
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