| 摘要 |
<p>Case No. 6257 PROCESS FOR RECOVERY OF BITUMEN FROM TAR SANDS Bitumen contained in tar sands is extracted in a primary extraction step which produces a bitumencontaining froth. A hydrogen donor diluent solvent is added to the froth, and the froth-solvent mix is subjected to a desalting operation. A bitumen-solvent product from the desalting step is subjected to a coking operation. In one embodiment, a delayed coker is used, and a gas oil fraction from the coker overhead vapors is hydrogenated and used as the donor solvent in the desalting step.</p> |
