ASTM D4422 Standard Test Method for Ash in Analysis of Petroleum Coke
3. Summary of Test Method
3.1 A representative sample of petroleum coke is dried, ground, and ashed in a muffle furnace at 700 to 750°C. The residue or ash is expressed as a percentage of the dry petroleum coke.
4. Significance and Use
4.1 The ash content is one of the properties used to evaluate petroleum coke and indicates the amount of undesirable residue present. Acceptable ash content varies with the intended use.
5. Interferences
5.1 High sulfur content of the furnace gases, regardless of the source of the sulfur, can react with an alkaline ash to produce erratic results. The furnace must be swept with air to achieve oxidation and to decrease the sulfur content of the gases.
5.2 Preparation and testing of the analysis sample must neither remove nor add ash. Improper dividing, sieving, and crushing equipment, and some muffle furnace lining material can contaminate the sample.
