Abstract: Isomerate does not contain olefin and aromatics, so it is an ideal blending component of gasoline. UOP Penex-DIH (the isomerization reaction＋de-isohexane tower) process can be used to convert normal paraffin with lower octane number into isoparaffin with higher octane number to produce clean gasoline blending component with RON 85 or higher . The core of Penex-DIH isomerization unit is the Ⅰ-82 low-temperature catalyst. In order to avoid the permanent deactivation of Ⅰ-82 catalyst due to the influence of water, nitrogen, oxygen and other impurities in the feed, a purification unit for raw material of isomerization unit was added. The purification results showed that the impurity index can meet the requirements of the Penex-DIH isomerization reactor, ensuring the stability of the isomerization performance of the I-82 catalyst and the long-term operation.

Key words: Penex-DIH process, isomerization, purification of raw material, impurity