Abstract: SINOPEC Luoyang Company innovatively blended a small amount of C₄ originally used as MTBE feed, C₅ fraction from gas fractionator, or sulfur-free LPG from reformer into the post-MTBE C₄ feedstock in a SINOALKY sulfuric acid alkylation unit, and investigated the change of operation parameters and the effect of various feedstocks on acid consumption of the unit. The results show that the alkylate quality from each feedstock is qualified during blending, with the RON of 96.1—96.8, the final boilling point below 194.2 ℃, and the vapor pressure of 42.8—49.5 kPa. The yield of alkylate increased by 7.40 percentage points when mixing C₄ fration, and increased by 2.46 percentage points when mixing C₅ fraction. The practical application has greatly broadened the adaptability of feedstocks for SINOALKY sulfuric acid alkylation unit, which can provide a new idea for process package improvement and refinery production optimization.

Key words: sulfuric acid alkylation, C4 fraction, isobutene, C5 fraction, gas fractionator