Purification of polyols prepared using double metal cyanide comp

Details Purification of polyols prepared using double metal cyanide comp Purification of polyols prepared using double metal cyanide comp

1988-11-25

1989-10-31

Mars, Howard T.

Organic compounds -- part of the class 532-570 series

Organic compounds

Oxygen containing

568616, 568617, C07C 4134, C07C 4144

Patent

active

048779067

ABSTRACT:
A method for removing double metal cyanide complex catalyst from polyether polyols is disclosed which uses alkali metal compounds and phosphorous compounds to precipitate the residual catalyst, which may then be removed by filtration. In one embodiment, a propylene oxide polyol is treated with sodium metal dispsersion, capped with ethylene oxide, treated with magnesium silicate, and then filtered to remove at least a portion of the catalyst. Substantially complete catalyst removal is then achieved by treating the polyol with hypophosphorous or phosphorous acid to precipitate the remaining solubilized double metal cyanide complex catalyst residue, neutralizing the excess acid with magnesium silicate, and filtering.

REFERENCES:
patent: 3278459 (1966-10-01), Herold
patent: 3941849 (1976-03-01), Herold
patent: 4355188 (1982-10-01), Herold et al.
patent: 4721818 (1988-01-01), Harper et al.

Affiliated with

Also associated with

Rating

Purification of polyols prepared using double metal cyanide comp does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Purification of polyols prepared using double metal cyanide comp, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Purification of polyols prepared using double metal cyanide comp will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-627107