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US 5,962,330 AGranted
Method for detecting acid- and base-extractable markers
AssigneeMorton International, Inc.
InventorsJustin J. Frederico, Haresh A. Doshi
Life of this patent
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Abstract
Markers which are soluble in petroleum fuel and are extractable from petroleum fuel by either acidic aqueous solutions or basic solutions and develop a color in the presence of the extracting acidic or basic aqueous solution, are identified by passing a specimen putatively containing the marker through an acidic resin column or a basic resin column, as the case may be.
Claims6
A method of identifying a petroleum fuel-miscible marker which is either
- a) extractable from a petroleum fuel in acidic aqueous solution and undergoes a chromophoric reaction in the presence of acid which produces a visible color, or
- b) extractable from a petroleum fuel in alkaline aqueous solution and undergoes a chromophoric reaction in the presence of base which produces a visible color, the method consisting of the steps of:
- withdrawing an organic liquid specimen which putatively contains said marker,
- passing said liquid specimen through a resin column which in the case of a) is an acidic ion exchange resin and in the case of b) is a basic ion exchange resin, and
- noting visible color in said column resulting from, in the case of a) said chromophoric reaction which takes place in the presence of an acid, and in the case of b) said chromophoric reaction which takes place in the presence of a base.
2 more elements
Dependencies are inferred from the claim text.