Colorless petroleum marker dyes

a petroleum marker and dye technology, applied in the direction of diaryl/triaryl methane dyes, thickeners, fuels, etc., can solve the problems of phthalein derivatives and their typically low solubility in petroleum products

Inactive Publication Date: 2002-03-28
ASGAONKAR ANJALI S
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

0010] It is preferred that the liquid petroleum product is gasoline, diesel fuel, jet fuel, fuel oil, kerosene or lamp oil. It is preferred that the compound of formula I is present in an amount from 0.5 ppm to 100 ppm, and further preferred that it is present in an amount from 0.5 ppm to 10 ppm. It is preferred that the compound of formula I is prepared as a mixture with a high-boiling hydrocarbon-soluble solvent. Preferred solvents include 1-octyl-2-pyrrolidone, mixed methylnaphthalenes (sold as AROMATIC 200 by Exxon Corporation) or aromatic hydrocarbon solvents. The preferred concentration of the marker in the solvent is from 20% to 30%.

Problems solved by technology

However, this reference discloses only compounds having two phenolic hydroxyl groups, and does not suggest the use of phthalein esters as markers.
The disadvantages of phthalein derivatives stem from their typically low solubility in petroleum products.

Method used

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Examples

Experimental program
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example 1

Preparation of the Di-n-Butyl Ester of o-Cresolphthalein

[0013] To a 100 mL, three-neck round-bottom flask fitted with a stirrer, thermocouple and a condenser, the following raw materials were added: (1) o-cresolphthalein, 1.73 g (0.005 moles); (2) water, 30 mL; (3) 50% NaOH, 0.8 g; (4) Na.sub.2CO.sub.3, 0.6 g; and (5) xylenes, 8 g. The mixture was stirred at 20-25.degree. C. for one hour, during which butyric anhydride, 2 g, was added. The mixture was then heated to 50-55.degree. C. until TLC revealed that the esterification reaction was complete. The upper xylenes layer was separated and 1-octyl-2-pyrrolidone, 2.5 g was added to it. Xylenes and water were removed azeotropically under vacuum. A residue of 6.6 g was obtained.

[0014] A marker solution was prepared by dissolving a 100 mg portion of the residue in xylenes (100 mL), and diluting 1 mL of the resulting solution to 100 mL with kerosene to make a 10 ppm solution.

[0015] A developer was made by dissolving 1 g of a 40% solution ...

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Abstract

A composition comprising a liquid petroleum product and a colorless marker compound in an amount that is not detectable visually, and a method for marking a liquid petroleum product with a colorless marker compound.

Description

[0001] This invention relates generally to a composition comprising a colorless marker dye and a liquid petroleum product, and to a method for marking petroleum products.[0002] Certain phthalein derivatives are known and used as markers in petroleum applications and other industrial applications such as paints and plastics. For example, U.S. Pat. No. 6,002,056 describes the use of thymolphthalein, cresolphthalein and related compounds as markers for petroleum products. However, this reference discloses only compounds having two phenolic hydroxyl groups, and does not suggest the use of phthalein esters as markers.[0003] The disadvantages of phthalein derivatives stem from their typically low solubility in petroleum products. As a result of this characteristic, phthalein markers can be removed from a marked petroleum product by extraction with water, either deliberately by one seeking to circumvent the marking, or as a result of contact of the marked petroleum product with water botto...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C07D307/88C09B11/00C10L1/00C10L1/10C10L1/18C10L1/19C10L1/20
CPCC10L1/003C10L1/1855C10L1/191C10L1/202C10L1/205C10L1/10
Inventor ASGAONKAR, ANJALI S.
Owner ASGAONKAR ANJALI S
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