Method for removing chlorinated solvents from chlorinated polymers
AssigneeCaffaro S.p.A.
InventorEnrico Pontoglio
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Abstract
Method for removing chlorinated solvents from chlorinated polymers which retain them as a result of a chlorination process, wherein after being dried and pulverized, said chlorinated polymer is treated with a non-halogenated aliphatic organic solvent or a halogenated aromatic organic solvent. Said organic solvent pertains to the following groups: alcohols such as methanol, ethanol, isopropanol; esters such as methyl formate, ethyl formate, methyl acetate; nitriles such as acetonitrile; aromatic halides such as chlorobenzene; hydrocarbons such as n-hexane; and acetone.
Claims9
A method for removing chlorinated solvents contained in chlorinated polymers comprising treating said chlorinated polymer in dry powder form with an inert gas saturated with acetone vapour.
A method for removing chlorinated solvents contained in chlorinated polymers comprising treating said chlorinated polymer in dry powder form with acetone in vapour form, said polymer being at a temperature exceeding the boiling point of acetone.
A method for removing chlorinated solvents contained in chlorinated polymers comprising treating said chlorinated polymer in dry powder form with vapours of acetone mixed with carbon tetrachloride.
A method for removing chlorinated solvents contained in chlorinated polymers comprising treating said chlorinated polymer in dry powder form with acetone mixed with water under agitation, filtering said treated polymer and drying said filtered polymer.
Dependencies are inferred from the claim text.