Process for the removal of vinyl chloride from polyvinyl chloride latexes and slurries with hydrocarbon compounds
AssigneeTenneco Chemicals, Inc.
InventorsDonald Goodman, Marvin Koral, Robert S. Miller, Robert J. Stanaback
Life of this patent
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Abstract
Vinyl chloride is removed from polyvinyl chloride dispersions, latexes, and slurries by sparging them with a gaseous organic compound, such as methane, while they are maintained at subatmospheric pressure.
Claims10
The process for the removal of vinyl chloride from an aqueous dispersion, latex, or slurry that contains from about 1000 parts to 20,000 parts by weight of vinyl chloride per million parts by weight of said dispersion, latex, or slurry and from 5% to 50% by weight of a vinyl chloride polymer selected from the group consisting of polyvinyl chloride and copolymers of vinyl chloride and at least one monomer copolymerizable therewith that comprises maintaining the dispersion, latex, or slurry at a pressure between about 100 mm. and 600 mm. mercury absolute while sparging it with a gaseous organic compound selected from the group consisting of aliphatic hydrocarbons having 1 to 4 carbon atoms, halogenated aliphatic hydrocarbons having 1 or 2 carbon atoms and 1 to 4 halogen atoms, and mixtures thereof until the dispersion, latex, or slurry contains less than about 10 parts by weight of vinyl chloride per part by weight of said vinyl chloride polymer.
Dependencies are inferred from the claim text.