The present application provides a method and system for the characterization of properties of liquids, particularly petroleum and petroleum liquids. The method and system can be used to take measurements of the liquid directly in a storage container, without exposing the contents of the container to the external environment.

The present application provides a method and system for the characterization of properties of liquids, particularly petroleum and petroleum liquids. The method and system can be used to take measurements of the liquid directly in a storage container, without exposing the contents of the container to the external environment.

A device may include a memory storing instructions and a processor configured to execute the instructions to obtain a research octane number for a sample; perform a combustion test for the sample in a constant volume combustion chamber; and record, at time points during the combustion test, pressure values. The processor may be further configured to calculate values for one or more pressure parameters for the sample based on the pressure values; generate a research octane number function for the constant volume combustion chamber based on the determined research octane number and the calculated values for the one or more pressure parameters; and use the generated research octane number function to determine research octane numbers for samples using the constant volume combustion chamber.

A device may include a memory storing instructions and a processor configured to execute the instructions to obtain a research octane number for a sample; perform a combustion test for the sample in a constant volume combustion chamber; and record, at time points during the combustion test, pressure values. The processor may be further configured to calculate values for one or more pressure parameters for the sample based on the pressure values; generate a research octane number function for the constant volume combustion chamber based on the determined research octane number and the calculated values for the one or more pressure parameters; and use the generated research octane number function to determine research octane numbers for samples using the constant volume combustion chamber.

Methods of extracting 1-4 cycle heterocyclic compounds and 2-5 cycle polynuclear aromatic hydrocarbons from a hydrocarbon feedstock are described. The methods include providing a hydrocarbon feedstock containing crude oil fractions, and determining an A/R ratio and an asphaltene concentration of the hydrocarbon feedstock. Based upon the A/R ratio and the asphaltene concentration, the treatable hydrocarbon feedstock undergoes one or more of cracking and fractionating. Subsequently, at least one targeted portion of the heterocyclic compounds is extracted from the fractionated stream with an aqueous solvent. A stream containing the 2-5 cycle polynuclear aromatic hydrocarbons is transferred to an extractor and the 2-5 cycle polynuclear aromatic hydrocarbons are extracted with a solvent system comprising an aprotic solvent.

Methods of extracting 1-4 cycle heterocyclic compounds and 2-5 cycle polynuclear aromatic hydrocarbons from a hydrocarbon feedstock are described. The methods include providing a hydrocarbon feedstock containing crude oil fractions, and determining an A/R ratio and an asphaltene concentration of the hydrocarbon feedstock. Based upon the A/R ratio and the asphaltene concentration, the treatable hydrocarbon feedstock undergoes one or more of cracking and fractionating. Subsequently, at least one targeted portion of the heterocyclic compounds is extracted from the fractionated stream with an aqueous solvent. A stream containing the 2-5 cycle polynuclear aromatic hydrocarbons is transferred to an extractor and the 2-5 cycle polynuclear aromatic hydrocarbons are extracted with a solvent system comprising an aprotic solvent.