Improved quench oil for high temperature coking of residua

Claim 1

AN IMPROVED FLUIDIZED SOLIDS TRANSFER LINE HEAVY OIL COKING PROCESS FOR THE PRODUCTION OF CHEMICAL AND CHEMICAL INTERMEDIATES WHICH COMPRISES CONTACTING A HEAVY OIL IN A TRANSFER LINE COKING ZONE WITH FLOWING FLUIDIZED PARTICULATE SOLIDS MAINTAINED AT A TEMPERATURE ABOVE 1200* F. TO PRODUCE VAPOROUS PRODUCT AND CARBONACEOUS RESIDUE WHICH IS DEPOSITED ON SAID PARTICULATE SOLIDS, SEPERATING PARTICULATE SOLIDS FROM SAID VAPOROUS PRODUCTS, THEREAFTER INJECTING A LIQUID QUENCH MEDIUM OBTAINED AS DESCRIBED BELOW INTO SAID VAPOROUS PRODUCT TO QUICKLY LOWER THE TEMPERATURE THEREOF BELOW AT LEAST 733*F. AND FORM A LIQUID-VAPOR MIXTURE SEPARATING SAID MIXTURE TO OBTAIN AT LEAST A NAPHTHA PRODUCT A LIGHT GAS OIL FRACTION BOILING IN THE RANGE OF 430-650*F. AND A TAR BOTTOMS HAVING AN INITIAL BOILING POINT IMMEDIATELY ABOVE SAID LIGHT GAS OIL FRACTION AND INCLUDING SUBSTANTIALLY ALL VAPOROUS PRODUCT BOILING ABOVE SAID LIGHT GAS OIL FRACTION, STRIPPING SAID TAR BOTTOMS TO OBTAIN AN OVERHEAD FRACTION HAVING A FINAL BOILING POINT BELOW 800*F. AND CONDENSING AND COMBINING SAID OVERHEAD FRACTION WITH A PORTION OF SAID LIGHT GAS OIL FRACTION AND RETURNING THE COMBINED MATERIAL AS SAID QUENCH MEDIUM.