Organic compounds -- part of the class 532-570 series – Organic compounds – Oxygen containing
Reexamination Certificate
2005-11-29
2005-11-29
Price, Elvis O. (Department: 1621)
Organic compounds -- part of the class 532-570 series
Organic compounds
Oxygen containing
C568S852000, C568S861000, C568S868000, C568S872000
Reexamination Certificate
active
06969779
ABSTRACT:
The present invention is an improvement upon the process for the production of 1,3-propanediol (PDO) wherein an aqueous solution of 3-hydroxypropanal (HPA) is formed, and the HPA is subjected to hydrogenation to produce a crude PDO mixture comprising PDO, water, MW176 acetal, and high and low volatility materials, wherein the crude PDO mixture is dried to produce a first overhead stream comprising water and some high volatility materials and a dried crude PDO mixture as a first distillate bottoms stream comprising PDO, MW176 acetal, and low volatility materials, and wherein the dried crude PDO mixture is distilled to produce a second overhead stream comprising some high volatility materials, a middle stream comprising PDO and MW176 acetal, and a second distillate bottoms stream comprising PDO and low volatility materials. The improvement on this process comprises treating the crude PDO mixture and/or the dried crude PDO mixture and/or the PDO product with an acidic zeolite, an acid form cation exchange resin, or a soluble acid to convert the MW176 cyclic acetal to more volatile materials which can be easily separated from PDO by distillation.
REFERENCES:
patent: 5008473 (1991-04-01), Breitkopf et al.
patent: 5527973 (1996-06-01), Kelsey
patent: 5786524 (1998-07-01), Powell et al.
patent: 6235948 (2001-05-01), Sunkara et al.
patent: 0983985 (2000-03-01), None
patent: WO 98/49216 (1998-11-01), None
patent: WO 00/10953 (2000-03-01), None
patent: WO 00/14041 (2000-03-01), None
Blackbourn Robert Lawrence
Brewer Stephen Edward
Diaz Zaida
Komplin Glenn Charles
Powell Joseph Broun
Price Elvis O.
Shell Oil Company
LandOfFree
Method for removal of MW176 cyclic acetal formed during the... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for removal of MW176 cyclic acetal formed during the..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for removal of MW176 cyclic acetal formed during the... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3512081