| 摘要 |
A process for recovering oil from an oil-bearing bituminous material containing bituminous resins and oil comprises intimately contacting said bituminous material with liquid neopentane at a temperature within the range of 0 DEG to 250 DEG F., separating the resulting mixture into a first fraction comprising bituminous oil dissolved in neopentane and a second fraction comprising undissolved bituminous material including said resins, and recovering the oil from the first fraction. The oil so obtained is free from asphaltenes, resins and waxes. The insoluble portion may be separated by settling, centrifuging or filtration and may then be treated with another paraffinic solvent to extract resins. Alternatively the bituminous material may first be extracted with n-pentane or iso-pentane to extract oil and resins, and the resins subsequently precipitated from the solution with neo-pentane which dissolves only the oil. |
