why butane not used in place of propane asphalting
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A DESAPHALTING PROCESS IN WHICH A RESIDUAL OIL HAVING A VISCOSITY ABOVE ABOUT 2500 S.S.U. AT 210* F. IS ADMIXED WITH A DEASPHALTING AGENT CONSISTING ESSENTIALLY OF PROPANE AND BUTANE IN WHICH THE SAID BUTANE COMPRISES ABOUT 14% BY VOLUME OF THE DESAPHALTING AGENT.
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