abstract |
THE FORMATION OF COKE IN HIGH-TEMPERATURE PETROLEUM TREATMENTS IS RETARDED BY ADDING TO THE OIL A COKE-RETARDING AMOUNT OF A COKE RETARDER SELECTED FROM THE GROUP CONSISTING OF ELEMENTAL PHOSPHOROUS AND COMPOUNDS THEREOF. VERY SMALL AMOUNTS OF THESE COKE RETARDERS ARE EFFECTIVE, WHILE THEY GENERALLY BECOME INEFFECTIVE ABOVE ABOUT 0.5%, BASED ON THE WEIGHT OF THE OIL. |