Inhibition of dioxane formation during recovery of glycols from polyester resins
AssigneeEastman Kodak Company
InventorsWilliam J. Gamble, Walter T. Gurney
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Abstract
There is described a process for avoiding dioxane formation during the depolymerization of polyester into glycol and ester components by passing superheated methanol through a reaction mixture containing polyester, oligomer and contaminants that are capable of forming sulfuric or halogen acids, the process comprising the step of adding sufficient base to neutralize any acid formed from the contaminants.
Claims9
A process for avoiding dioxane formation during the depolymerization of polyester into glycol and ester components by passing superheated methanol through a reaction mixture containing polyester, oligomer and contaminants that under depolymerization conditions are capable of forming acid catalysts for the formation of dioxane, the process comprising the step of adding sufficient base to neutralize acid formed from the contaminants.
Dependencies are inferred from the claim text.