| 摘要 |
PCT No. PCT/US92/11394 Sec. 371 Date Jun. 30, 1994 Sec. 102(e) Date Jun. 30, 1994 PCT Filed Dec. 31, 1992 PCT Pub. No. WO93/13035 PCT Pub. Date Jul. 8, 1993.An improved low temperature process for extracting oil from oil-bearing materials by extracting the oil-bearing material in an extraction zone with a normally gaseous solvent selected from propane, butane, and mixtures thereof. As the resulting solvent/oil mixture is passed through the bed of extracted oil-bearing material, from the extraction zone, and to a separation zone, it is done so under conditions that will maintain the solvent in liquid form. The resulting extracted materials have substantially more of their protein and vitamin value intact when compared with similar materials extracted by more conventional high temperature methods. The present process is also a lower energy consuming process than more conventional, extractive processes.
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