ABSTRACT
Aromatic compounds are those compounds that contain one or more benzene rings or similar ring structures, many of which occur in crude oil and crude oil products. Aromatic compounds are valuable starting materials for a variety of chemical products. In the traditional chemical industry, aromatic derivatives such as benzene, toluene, and the xylene were made from coal during the course of carbonization in the production of coke and town gas. Reforming processes have made benzene, toluene, xylene, and ethylbenzene economically available from petroleum sources. Aromatic hydrocarbon derivatives, paraffin hydrocarbon derivatives, react by substitution, but by a different mechanism under milder reaction conditions. The isomerization reactions of aromatic hydrocarbon derivatives proceed during implementation of such catalytic processes, as reforming, cracking, and also in isomerization processes of alkyl aromatic hydrocarbon derivatives. The benzene is then separated from the other aromatic derivatives by distillation.
