The product is colorless transparent liquid, flammable, with ether odor, can generate explosive peroxide in the air, and can be mixed with water, alcohol, ketone, benzene, ester, ether, hydrocarbon. Colorless liquid. Relative density (d204) 0.889, boiling point 67ºC, freezing point -108ºC, flash point -15ºC (open cup), refractive index (n20D) 1.4068, spontaneous combustion point 321.1ºC, viscosity (20ºC) 0.53cP, hue (APHA) ≤20. In the first industrial production, a mixture of sugar aldehyde and vapor was passed into a reactor filled with zinc-chromium-manganese metal oxide (or palladium) catalyst, and furan was decarbonylated at 400-420ºC, and then furan was hydrogenated to tetrahydrofuran at 80-120ºC with skeleton nickel as catalyst. The production of 1 ton of tetrahydrofuran requires about 3 tons of polysaccharide aldehyde. There are many production methods developed later, the industrial method is 1, 4-butanediol catalytic dehydration ring method, because butanediol is prepared from acetylene and formaldehyde, this method is called the Reppe method, using 1, 4-dichlorobutadiene, a byproduct of the neoprene monomer chloroprene to produce tetrahydrofuran, In recent years, a catalytic hydrogenation process using maleic anhydride as raw material has been developed.
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