The results of pilot-industrial tests of sulfuric acid alkylation of isobutene from butane-butylene fractions in a tubular continuous-flow contactor operating in the turbulent regime with internal cooling are reported. After the time of contact (similar to30 sec) of the reagents, an alkylate that satisfies the requirements for specifications is formed. Data from the chromatographic-mass spectrometric analysis of the alkylate are reported.