Manufacture of polyvinyl chloride of low vinyl chloride...

Details Manufacture of polyvinyl chloride of low vinyl chloride... Manufacture of polyvinyl chloride of low vinyl chloride...

C - Chemistry, Metallurgy

08

F

402/5.5

C08F 6/10 (2006.01) C08F 6/00 (2006.01) C08F 14/06 (2006.01)

Patent

CA 1118142

ABSTRACT The invention relates to a process whereby vinyl chloride monomer (VCM) is removed from the wet cake produced during or after centrifuging or otherwise dewatering in the suspension process for producing poly (vinyl chloride) (PVC). Steam is passed through the wet cake, thereby removing VCM from the resin. As a result the PVC has less VCM associated therewith, for example, ten parts per million (weight/weight), or even as low as not to be detected by gas chromatography with a sensitivity of analyzing 0.1 ppm VCM. "Wet cake" is meant to include PVC homopolymers and copolymers containing from 1 to 50% (wt./wt.) of water and having particle sizes in the range of about 1 to 500 microns in diameter. The preferred embodiment is in-process application of steam to the wet cake so that the VCM may be condensed, com- pressed, or otherwise captured. Also included is the treatment of the resin after a drying step to obtain PVC of low VCM content. Better VCM removal is obtained than with conventional methods where a slurry or latex of high VCM content is processed.

229920

Affiliated with

Also associated with

Rating

Manufacture of polyvinyl chloride of low vinyl chloride... does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Manufacture of polyvinyl chloride of low vinyl chloride..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manufacture of polyvinyl chloride of low vinyl chloride... will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFCA-PAI-O-1086789