Creosote and a method for producing the same
AssigneeKoppers Company, Inc.
InventorDonald V. Todd
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Abstract
An improved creosote wood preservative is produced that has a reduced crystal content, a light color and that makes a creosote-pentachlorophenol preservative less corrosive to metals. This improved creosote is produced by mildly hydrogenating a conventional coal tar creosote to reduce the aromaticity index, I.sub.A, by 10-62%. This is accomplished by hydrogenating the creosote at a temperature in the range of 250.degree.-450.degree.C. in the presence of a sulfur resistant hydrogenation catalyst.
Claims15
A process for producing an improved creosote wood preservative having a reduced tendency to form crystals and a lighter color than a conventional coal tar creosote, comprising:
- subjecting a conventional coal tar creosote to a mild hydrogenation to reduce the aromaticity index by 10-62%, whereby the improved creosote wood preservative is produced.
A process for producing an improved pentachlorophenol in creosote wood preservative having a reduced corrosivity to metals, comprising:
- subjecting a conventional coal tar creosote to mild hydrogenation to reduce the aromaticity index 10-62% to produce an improved creosote;
- and
- adding pentachlorophenol to the improved creosote.
Dependencies are inferred from the claim text.