Steam stripping polyvinyl chloride resins

Details Steam stripping polyvinyl chloride resins Steam stripping polyvinyl chloride resins

1976-01-15

1978-04-25

Henderson, Jr., Christopher A.

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

Synthetic resins

Treating polymer containing material or treating a solid...

159 47R, 203 88, 203 96, 526344, 528501, 528502, C08F 610

Patent

active

040864146

ABSTRACT:
A method for reducing the vinyl chloride monomer content of polyvinyl chloride resins suspended as a slurry in an aqueous medium. The polyvinyl chloride-water slurry as produced in a conventional suspension resin autoclave, or a resin-water slurry prepared subsequent to suspension polymerization, is placed in a vessel and heated to a suitable temperature for removal of vinyl chloride monomer from the resin. In this operation, the polyvinyl chloride-water slurry is agitated in a vessel and steam is injected directly into the slurry to rapidly heat the slurry up to a minimum temperature of at least about 180.degree. F. The slurry is cooled immediately, or optionally it can be maintained for a period of time at the selected maximum temperature and then rapidly cooled by applying vacuum to the vessel and condensing the vapor phase removed from the vessel. Dried polyvinyl chloride resin produced by this process has been found to have a vinyl chloride monomer content below a detectable limit of 0.5 ppm.

REFERENCES:
patent: 2068424 (1937-01-01), Mark
patent: 2458636 (1949-01-01), Plambeck, Jr.
patent: 3052663 (1962-09-01), Bodlaender
patent: 3475398 (1969-10-01), Jobard
patent: 3749685 (1973-07-01), Johnson, Jr.
patent: 3956249 (1976-05-01), Goodman
Chem. Abst., 80, 146608(c), 1974.

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