Abstract: In order to increase the production of high octane C₅/C₆ isomerization oil and meet the needs of gasoline quality upgrading, a certain refinery adopts the solid superacid C₅/C₆ isomerization technology developed by SINOPEC Research Institute of Petroleum Processing Co., Ltd. to carry out technical transformation of the existing medium temperature molecular sieve C₅/C₆ isomerization unit. Compared with the medium temperature molecular sieve C₅/C₆ isomerization technology, the reaction temperature of solid superacid C₅/C₆ isomerization is lower, the feed air velocity is higher, the catalyst density is higher, and the requirements for water content in the raw materials are more stringent. Therefore, a renovation plan was designed to stop using one original reactor, add a drying unit for raw oil and hydrogen, and add an online water content analysis unit. This technology renovation plan has lower investment costs, lower renovation difficulties, and a high equipment utilization rate (up to 81.5%); After the technological transformation of the device, the isomerization reaction temperature was reduced by 70 ℃, the research octane number of isomerized oil increased by 6.8, reaching 85, and the comprehensive energy consumption of the device decreased by 6.09%, achieving the technical transformation effect of exchanging small investment for large returns.

Key words: medium-temperature zeolite, C₅/C₆ isomerization, solid superacid, RISO-C catalyst