“…There, lignite with a bitumen content between 10 and 20% is used for industrial extraction of montan wax. The process used involves the following steps: size reduction, drying, extraction, evaporation of the extract, and formulation [57,60]. The yield and composition of the extract are determined by coal quality (clay and mineral content); physical parameters such as water content, particle size, and particle-size distribution; and properties of the solvent.…”