ASTM D3279−12 Standard Test Method for n-Heptane Insolubles

ASTM D3279−12 Standard Test Method for n-Heptane Insolubles

Scope
1.1 This test method covers determination of the mass percent of asphaltenes as defined by insolubility in normalheptane solvent.

It is applicable to all solid and semi-solid petroleum asphalts containing little or no mineral matter, to gas oils, to heavy fuel oils, and to crude petroleum that has been topped to a cut-point of 343°C or higher.

1.2 The values stated in SI units are to be regarded as the standard. No other units of measurement are included in this standard.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

See Section 7 for a specific hazard statement.

ASTM D3279−12 Standard Test Method for n-Heptane Insolubles

Significance and Use
4.1 This test method is useful in quantifying the asphaltene content of petroleum asphalts, gas oils, heavy fuel oils, and crude petroleum.

Asphaltene content is defined as those components not soluble in n-heptane.

Hazards
7.1 n-Heptane has a boiling point of 98°C and a flash point of −1°C, which means that it should be handled with care.

It is recommended that both the reflux dispersion and filtration steps be conducted in a ventilated hood and away from flames or other sources of heat.