👉 "Bitumenous" is a term that describes something that has a high content of lignin, which is a resinous polymer found in bitumen. This term can be applied to any substance that contains lignin as its main component, whether it is petroleum-based or not. It is often used in the context of petroleum refining and petrochemical industries where lignin is used for the production of various products like polyvinyl alcohol (PVA), cellulose acetate (CA), and