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A colorless odorless flammable gas alkane with three carbon atoms, molecular formula ch3ch2ch3, melting point - 189.7 ℃, boiling point - 42.1 ℃, relative density 0.5853 (- 45 / 4 ℃), refractive index 1.2898, heavier than air, often staying in low place, forming explosive mixture with air, explosion limit 2.4% - 9.5% (volume), easily soluble in ether, soluble in alcohol, benzene and chloroform, slightly soluble in acetone, insoluble in water However, it is easy to form solid hydrate with water at low temperature, which causes the blockage of natural gas pipeline. The critical temperature is 96.8 ℃, and the critical pressure is 4.24mpa. Chemical properties are not active, but halogenation and other reactions can occur. It exists in oil pyrolysis gas and natural gas.
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