Petroleum pitch preparation
Pitch precursor production by distillation
Plasticizer and method of preparing pitch for use in carbon and
Preparation of industrial asphalt
Preparation of petroleum pitch
Process and apparatus for modifying bitumen
Process for converting acid sludge to intermediate sludge and so
Process for enhancing catalytic response of asphalt oxidation ca
Processes for producing high grade asphaltic materials from low
Production of lubricating oils blending stocks and selected comp