| 摘要 |
<p>1,167,281. Carbon black oil. CONTINENTAL OIL CO. 1 Jan., 1968 [26 April, 1967], No 132/68. Heading C5E. A low quality carbon black oil is upgraded, i.e. its asphaltene content is decreased for a given correlation index (which is defined), by subjecting the oil to vacuum flash distillation at 10, thermally cracking the overhead at 12, recovering a tar at 16 from the cracking step, and blending the tar with the bottoms 13 from the distillation step. The low quality oil may be the thermal tar from the conventional thermal cracking of a virgin gas oil, see Figure, or the thermal tar manufactured from synthetic tower bottoms and cycle gas oil from a catalytic cracking unit. The process is applicable to hydrocarbon oils having a 5% point of 425‹ to 600‹ F, and the bottoms 10, 13 respectively have 5% points of 800‹ to 900‹ F. and 500‹ to 600‹ F. Cracking conditions are: pressure 150 to 1000 p.s.i.g., outlet temperature 800‹ to 1000‹ F., and in two examples the cracking residence times were 2À5 and 2À2 hours.</p> |
