What dye present in Petrol?

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T. H. Al-Noor

https://www.futuremarketinsights.com/reports/petroleum-fuel-dyes-and-markers-market

Andy Towns

Specific markers used in fuel (petroleum, diesel, etc) vary depending on geography and the regulations which apply there. The majority of colorants used are of the Solvent Dye class of the Colour Index. Listings of country-specific requirements for the marking of fuels with dyes can readily be found by a search of the WWW. The dyes used are non-polar, typically resembling conventional textile dyes but also bearing sizeable aliphatic chains to ensure good solubility in fuels; some are soluble up to 40% by weight in aromatic hydrocarbons although the levels used in marking are much lower. There are proprietary technologies out there too for covert fuel marking which are not made public.

Arindam Kumar Das

Sir, Thank you first of all.

I want to know specifically which dye compounds present in petrol? and how to remove this dye from petrol as I need to fluorescence studies upon petrol. Before doing this I have to remove to dye otherwise it gives positive results due to presence of dye,not or my requirement.

Ashis Ranjan Bandyopadhyay

I would, in your place, try out the following methods for this purpose.

A simple distillation of petrol : The dye is likely to remain as residue and if it happens the distillate should be colourless liquid.

Boil coloured petrol under reflux with active charcoal : Observe change in colour.

Pass your petrol through appropriate alumina / silica column: The material coming out of the column should be colourless.

One of the above-mentioned three methods should be able to help you out in solving your problem.

All the best to you,

ARB

I think ARB has made good suggestions. Of the options, I would favour no. 3. A silica column of a few hundred grams ought to be capable of removing even a fairly non-polar dye from at least several litres of fuel provided it’s hydrocarbon-based and alcohol-free. This option ought to have less impact on the composition of the other fuel components compared to option 1. If the fuel marker is an azo dye then stripping it out with aqueous acid is also possible (which is what fuel launderers do, for example, in the case of CI Solvent Yellow 124), but option 3 is simpler if only a small quantity of fuel is required. Good luck with your efforts.