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US 4,904,368 AGranted
Method for removal of furfural coke from metal surfaces
AssigneeAshland Oil, Inc.
InventorJoe D. Turner
Life of this patent
Estimating the term…
Abstract
A method for removing furfural-derived coke from metallic surfaces by heating in an oxygen-containing gas, such as air, for a time and at a temperature sufficient to change the crush strength of the furfural coke to a point which will permit easy removal of such coke, without such an evolution of heat that the metallurgical properties of said metal surfaces are undesirably changed.
Claims17
A process for preparing furfural coke for removal from metallic surfaces comprising:
- heating ship furfural coke without causing an evolution of heat capable of undesirably altering metallurgical properties of said surfaces in the presence of a gas with a total pressure of less than 100 p.s.i.g. containing molecular oxygen, said gas being at a sufficient temperature below 800.degree. F. (427.degree. C.) for a sufficient time to change the crush strength of the coke so as to permit removal with a water jet at a pressure of about 5000 p.s.i.
A process for preparing furfural coke for removal from metallic surfaces comprising:
- heating in the absence of any liquid phase without causing an evolution of heat capable of undesirably altering metallurgical properties of said surfaces in the presence of a gas containing molecular oxygen at a sufficient temperature below 800.degree. F. (427.degree. C.) for a sufficient time to change the crush strength of the coke so as to permit removal with a water jet at a pressure of 5000 p.s.i.
A process for preparing furfural coke for removal from metallic surfaces comprising:
- heating said furfural coke without causing an evolution of heat capable of undesirably altering metallurgical properties of said surfaces in the presence of a gas containing molecular oxygen at a sufficient temperature below 800.degree. F. (427.degree. C.) for a sufficient time to change the crush strength of the coke so as to permit removal with a water jet at a pressure of 5000 p.s.i., wherein weight loss of said furfural coke, as based upon the total weight of furfural coke prior to oxidation, is no greater than 30%.
Dependencies are inferred from the claim text.