Process for post-treatment of preservative-treated wood
AssigneeMooney Chemicals, Inc.
InventorsWilliam C. Kelso, Jr., Richard W. Hein
Life of this patent
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Abstract
Oil-borne preservative-impregnated wood is post-treated by: (A) contacting the preservative-impregnated wood in a closed vessel with steam and collecting a water-containing condensate generated in the vessel; (B) applying a vacuum which is sufficient to reflux water condensate to remove at least some surface deposits from the wood and to distill water out of the vessel leaving an oil-preservative solution in the vessel; (C) releasing the vacuum; and (D) recovering the post-treated wood from the vessel.
Claims16
An improved process for impregnating wood with oil-borne preservative solution in an impregnating vessel, wherein the improvement comprises subjecting the freshly preservative-impregnated wood to a post-treatment after the preservative solution and vacuum drip are removed from the impregnating vessel, said post-treatment comprising the steps of:
- (A) contacting the oil-borne preservative-impregnated wood in a closed vessel with steam and collecting a water-containing condensate in the vessel;
- (B) applying a vacuum which is sufficient to reflux water condensate to remove at least some surface deposits from the wood and to distill water out of the vessel leaving an oil-preservative solution in the vessel;
- (C) releasing the vacuum;
- and
- (D) recovering the post-treated wood from the vessel.
An improved process for impregnating wood with oil-borne preservative solution in an impregnating vessel, wherein the improvement comprises subjecting freshly preservative-impregnated wood to a post-treatment after the preservative solution and vacuum drip are removed from the impregnating vessel, said post-treatment comprising the steps of:
- (A) contacting the oil-borne preservative-impregnated wood in a closed vessel with steam, at a temperature of about 225.degree.-240.degree. F. at 0 to 10 psig while collecting a water-containing condensate in the vessel;
- (B) applying a vacuum of about 10 to about 24 inches of mercury, which is sufficient to reflux water condensate to remove at least some surface deposits from the wood and to distill water out of the vessel leaving an oil-preservative solution in the vessel;
- (C) releasing the vacuum;
- (D) removing the oil-preservative solution from the vessel;
- and
- (E) recovering the post-treated wood from the vessel.
An improved process for impregnating wood with oil-borne preservative solution in an impregnation vessel, wherein the improvement comprises subjecting the preservative-impregnated wood to a post-treatment after the preservative solution and vacuum drip are removed from the impregnating vessel, said post-treatment comprising the steps of:
- (A) adding hot water to the vessel in which is contained the preservative-impregnated wood;
- (B) applying a vacuum which is sufficient to reflux water to remove at least some surface deposits from the wood and to distill water out of the vessel leaving an oil-preservative solution in the vessel;
- (C) releasing the vacuum;
- and
- (D) recovering the post-treated wood from the vessel.
Dependencies are inferred from the claim text.