Nuclear reactor coolants

Claim 1

IN THE OPERATION OF A NUCLEAR REACTOR WHEREIN A FLUID IS PASSED THROUGH THE REACTOR TO ABSORB AND REMOVE HEAT LIBERATED BY THE NUCLEAR FUEL, THE IMPROVEMENT WHEREIN THE AROMATIC EXTRACT IS PASSED THROUGH THE REACTOR TO ABSORB AND REMOVE HEAT LIBERATED BY THE NUCLEAR FUEL, SAID AROMATIC EXTRACT HAVING A SULFUR CONTENT NO MORE THAN 0.5% BY WEIGHT AND IS OBTAINED FROM A CATALYTICALLY CRACKED CYCLE OIL BOILING WITHIN THE RANGE OF 300-500* C., SAID OIL BEING RICH IN AROMATIC COMPOUNDS AND CONTAINING RELATIVELY LARGE AMOUNTS OF SULFUR, BY DILUTING THE CYCLE OIL WITH A HYDROCARBON FRACTION BOILING IN THE RANGE OF 80-200*C., SUBJECTING THE DILUTED CYCLE OIL TO A CATALYTIC HYDROGENATION AT 25-75 ATMOSPHERES HYDROGEN PRESSURE AND 350-400*C. IN THE PRESENCE OF A HYDROGENATION CATALYST OF THE GROUP CONSISTING OF OXIDES AND SULFIDES OF THE IRON GROUP AND A SECOND CATALYST OF THE GROUP CONSISTING OF OXIDES AND SULFIDES OF A METAL OF THE LEFT-HAND COLUMN OF GROUP VI OF THE PERIODIC TABLE, SAID CATALYST BEING DEPOSITED ON A SUPPORT OF THE GROUP CONSISTING OF ALUMINA OR BAUXITE, SO AS TO SELECTIVELY HYDROGENATE AND REMOVE CONTAINED SULFUR COMPOUNDS WITHOUT APPRECIABLY SATURATING THE AROMATIC HYDROCARBON, WHEREBY THE SULFUR CONTENT IS REDUCED TO LESS THAN 0.5%, FRACTIONALLY DISTILLING THE HYDROGENATED PRODUCT TO REMOVE ALL FRACTIONS BOILING BELOW ABOUT 350*C., EXTRACTING THE TREATED CYCLE OIL WITH A SELECTIVE SOLVENT AT 50-100*C., AND RECOVERING AN AROMATIC RICH MIXTURE FROM THE SOLVENT EXTRACT.