Slurry column gasoline alkylation using gas phase olefin injection

An alkylation system for alkylation of isobutane with olefin to make alkylate for gasoline blending, the alkylation system comprising:

• a slurry reactor that receives a reactor feed slurry including catalyst and liquid isobutane, an olefin feed that is in a vapor phase or vaporizes upon being injected into the slurry reactor, and a circulating reactor vapor stream that combines with the olefin feed in the reactor to form a combined reaction vapor, where an alkylation reaction occurs in the reactor when the combined reaction vapor contacts the reactor feed slurry, and a reactor liquid effluent stream is produced, the reactor liquid effluent stream including catalyst, isobutane, and a liquid alkylate product;
• a slurry vessel that provides the reactor feed slurry to the slurry reactor;
• a catalyst source that provides catalyst to the slurry vessel;
• and
• an isostripper that provides a liquid isobutane feed stream to the slurry vessel.