Tetrahydrofuran, also known as oxacyclopentane, 1, 4-epoxybutane, is a heterocyclic organic compound, the chemical formula is C4H8O, belonging to ether, is the complete hydrogenation product of furan, colorless transparent liquid, soluble in water, ethanol, ether, acetone, benzene, etc., mainly used as solvent, chemical synthesis intermediates, analytical reagents.