NOVELTY - Production of refinery feedstock from black liquor soap comprises mixing the black liquor soap with an alcohol, and mixing the product resulting from the first step with an acid to produce a refinery feedstock.    USE - For production of refinery feedstock from black liquor soap obtained from a chemical pulp mill, to obtain methanol, biodiesel, sterols and related alcohols (claimed), gasoline, and other fuels.    ADVANTAGE - The method is economically viable. The amount of organics available for further refining is improved; and the amount of organics returned to the mill is minimized. Mills limited by the recovery boiler will be able to achieve further production increases. The soap derived refinery feedstock has a much higher yield of fatty acid esters (biodiesel) than conversion of soap to tall oil followed by production of biodiesel. Because the sterols are not consumed, further distillation can return more sterols than attempting to obtain sterols from tall oil. Refinery feedstock production is more stable and consistent than traditional plant based refinery feedstock, which is dependent on growing seasons. The method makes use of existing pulp mill facilities; thus, is considerably less capital intensive than known greenfield biodiesel plants requiring the installation of steam generating and acid facilities. Production of refinery feedstock from pulp mill byproduct, provides refinery feedstock with ready, year round supply. The method reduces the yield lost to esterification of resin and fatty acids with the sterols and related alcohols, by the conventional tall oil process; reduces greenhouse gas emissions when the resulting feedstock is further refined and used as a fuel in place of fossil fuels. Black liquor soap is mixed with methanol, making it easier to pump and mix. The cost to produce the refinery feedstock starts with a very low cost raw material (black liquor soap); while other processes, which create biodiesel from tall oil, have a much higher cost because of the value already added to the tall oil due to its previous processing.    DESCRIPTION OF DRAWING(S) - The drawing illustrates a flowsheet of the basic method of producing refinery feedstock from black liquor soap, involving sequentially adding methanol and sulfuric acid to black liquor soap to produce soap derived refinery feedstock.