Abstract: Taking a 360 kt/a reforming hydrogenation unit of a refinery as an example, based on the principle of “minimizing revamping cost, maximizing equipment reuse and shortening the construction period”, the process route and effect of revamping an idle unit of naphtha hydrotreating (NHT) into a C₅/C₆ isomerization unit were discussed from the aspects of process selection, construction scheme, application effect and economic benefit evaluation. The results showed that the conversion of a 360 kt/a NHT unit to a C₅/C₆ isomerization unit was one of the best ways to reuse the idle NHT unit.

Key words: reformer, naphtha hydrotreating, C₅/C₆ isomerization, clean gasoline