Several Petroleum Product Carbon Residue Tester

Residual carbon of petroleum products refers to the black carbonaceous residue remaining after the test oil is placed in a residual carbon measuring apparatus and heated to evaporate and thermally cracked under the condition of isolation from air, and is expressed as mass fraction.

Methods for the determination of residual carbon in petroleum products are the electric furnace method, the Conradson method, and the micro method.

Electric furnace method:

This method is applicable to the determination of lubricating oil, heavy liquid fuel or other petroleum products.

Petroleum Product Carbon Residue Determination Method (Electric Furnace Method) Method Summary: Under the specified test conditions, an electric furnace is used to heat (control temperature at 520℃±5℃) a sample of lubricating oil, heavy liquid fuel or other petroleum products for evaporation, and to determine the mass fraction of charred black residue (residual charcoal) formed after combustion.

Conradson Method:

This method is used to determine the carbonaceous residue left after evaporation and thermal cracking of petroleum products to provide an indication of the relative coking tendency of petroleum products.

Outline of the method: A weighed sample is placed in a crucible for decomposition and distillation, and the residue is heated intensely (under the flame of a gas torch) for a certain period of time to carry out cracking and coking reactions. At the end of the specified heating time, the crucible containing the carbonaceous residue is cooled in a desiccator and weighed to obtain the residual carbon value, i.e. the mass percentage of the residue.

Micro Residual Carbon Method:

This method is suitable for the determination of petroleum products with residual carbon values ranging from 0.10% to 30% by mass.

Outline of the method: The weighed sample is placed in a sample tube and heated to 500°C in an inert gas (nitrogen) according to the specified heating procedure. The volatile substances generated during the reaction are carried away by the nitrogen and the charcoal residue left behind is reported as a percentage of the mass of the original sample as the trace residual carbon value.

The micro carbon residue method has a short test period, easy to control the test conditions, small sample dosage (0.1~3.5g), high degree of automation, and can measure 12 samples (including reference samples) at the same time. It is now the international standard for the determination of residual carbon and is gradually replacing the Conradson method and the electric furnace method.