Gasoline additive (primary application): High-octane blending component to increase gasoline octane rating and reduce emissions of CO and unburned hydrocarbons in exhaust gases. Organic solvents for extraction, chromatographic analysis, and reaction solvents. Solvents for pharmaceutical and pesticide intermediate synthesis. Solvents for chemical raw material cracking to produce high-purity isobutylene for synthetic rubber, plastics, antioxidants, etc.