A method for transporting hydrogen may comprise, at a first hydrocarbon processing facility, passing a heavy naphtha stream, a C9+ aromatic compounds-containing stream, and an input hydrogen-containing stream to a hydrotreater to form a hydrotreated effluent stream; passing the hydrotreated effluent stream to a separation unit to form a naphthenics-containing stream and a separation unit effluent stream; transporting the naphthenic stream to a second hydrocarbon processing facility; and at the second hydrocarbon processing facility, passing at least a portion of the naphthenic stream to a dehydrogenation unit to form a hydrogen product stream. The first hydrocarbon processing facility and the second hydrocarbon processing facility may be separated by a distance of at least 100 km. Further disclosed herein are methods of processing hydrogen which produce aromatic compounds, including C9+ aromatic compounds containing streams.

Provided is a continuous process for converting waste polystyrene plastic into recycle for chemical and gasoline production. The process comprises selecting waste polystyrene and preparing a stable blend of a hydrocarbon feedstock and the polystyrene. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a conversion unit. Useful chemicals can be recovered, including C.sub.3 and C.sub.4 olefins and aromatics, as well as high octane gasoline.

Provided is a continuous process for converting waste polystyrene plastic into recycle for chemical and gasoline production. The process comprises selecting waste polystyrene and preparing a stable blend of a hydrocarbon feedstock and the polystyrene. The amount of plastic in the blend comprises no more than 20 wt. % of the blend. The blend is passed to a conversion unit. Useful chemicals can be recovered, including C.sub.3 and C.sub.4 olefins and aromatics, as well as high octane gasoline.