Method for the recovery of secondary polyols from paint sludges

Details Method for the recovery of secondary polyols from paint sludges Method for the recovery of secondary polyols from paint sludges

1996-11-12

1998-02-10

Cooney, Jr., John M.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Process of treating scrap or waste product containing solid...

521 45, 521 49, 521 495, C08G 1814

Patent

active

057169969

ABSTRACT:
The invention relates to a method for the recovery of secondary polyols from paint sludge coagulate, formed from paint overspray which has first been dewatered by mass action, by chemical treatment in a manner such that the recovered product can be reused in the manufacture of paints. According to the recovery method, the organic components contained in the paint coagulate are glycolytically split at an elevated temperature into reusable polyols. Preferably, a mixture of different glycols is used, preferably in an amount of about 20 to 50% by weight based on the dewatered paint coagulate. The addition of glycol dilutes the paint coagulate and makes it flowable. The water contained in the paint coagulate is evaporated and removed during the glycolytic splitting because of the increase in temperature. The impurities contained in the paint coagulate, such as pigments, coagulants or flocculants, can be comminuted and finely dispersed by intensive shearing of the paint coagulate. At the end of the process, these impurities can also be filtered out from the polyols formed.

REFERENCES:
patent: 4511680 (1985-04-01), Niederdellmann et al.
patent: 5252615 (1993-10-01), Rao et al.
patent: 5281629 (1994-01-01), Hovestadt et al.
patent: 5453460 (1995-09-01), Hovestadt et al.
Alkoholyse--chemisches Recyclingverfahren fur PUR und gemischte Kunstrstoffbfalle, Kunstoffe 81 (1991) 4, pp. 301-305.

Affiliated with

Also associated with

Rating

Method for the recovery of secondary polyols from paint sludges 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 the recovery of secondary polyols from paint sludges, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for the recovery of secondary polyols from paint sludges will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2077795