Method of removing contaminants from plastic resins
AssigneeHoneywell Federal Manufacturing & Technology, LLC
InventorsGeorge W. Bohnert, Thomas E. Hand, Gary M. Delaurentiis
Life of this patent
Estimating the term…
Abstract
A method for removing contaminants from synthetic resin material containers using a first organic solvent system and a second carbon dioxide system. The organic solvent is utilized for removing the contaminants from the synthetic resin material and the carbon dioxide is used to separate any residual organic solvent from the synthetic resin material.
Claims29
A method for removing contaminants from synthetic resin material comprising contacting particulate synthetic resin material containing at least one contaminant with an alkyl lactate solvent in a vessel, at least a portion of said at least one contaminant being removed from said particulate synthetic resin material and becoming dissolved in said solvent.
A method for removing contaminants from synthetic resin material comprising the steps of:
- (a) contacting particulate synthetic resin material containing at least one contaminant with a solvent other than carbon dioxide, at least a portion of said contaminant being removed from said particulate synthetic resin material and becoming dispersed in said solvent;
- (b) removing at least a portion of said solvent from said particulate synthetic resin material;
- and
- (c) contacting said particulate synthetic resin material with liquid carbon dioxide, at least a portion of said solvent not removed in step (b) being removed from said particulate synthetic resin material and becoming dissolved in said carbon dioxide.
A system for removing contaminants from synthetic resin material comprising:
- (a) at least one solvent vessel including therein a quantity of a liquid solvent other than carbon dioxide for contacting with said synthetic resin material;
- (b) at least one mechanical separation device for removing at least a portion of said solvent from said synthetic resin material;
- and
- (c) at least one carbon dioxide vessel including therein a quantity of liquid carbon dioxide for contacting said synthetic resin material and removing at least a portion of said solvent remaining on said synthetic resin material.
A method for removing contaminants from synthetic resin material comprising the steps of:
- (a) contacting particulate synthetic resin material containing at least one contaminant with a liquid consisting essentially of a solvent other than carbon dioxide, at least a portion of said contaminant being removed from said particulate synthetic resin material and becoming dispersed in said liquid;
- (b) removing at least a portion of said solvent from said particulate synthetic resin material;
- and
- (c) contacting said particulate synthetic resin material with liquid or supercritical carbon dioxide, at least a portion of said solvent not removed in step (b) being removed from said particulate synthetic resin material and becoming dissolved in said carbon dioxide.
Dependencies are inferred from the claim text.