Hydrodesulfurization process

Claim 1

IN A CONTACT ABSORPTION HYDRODESULFURIZATION PROCESS IN WHICH A VAPOROUS HIGH BOILING PETROLEUM HYDROCABRON CONTAINING SULFUR, AND HYDROGEN-CONTAINING GAS UNDER PRESSURE ARE PASSED TOGETHER THROUGH A CHAMBER CONTAINING A CONTACT AGENT COMPRISING SUBSTANTIALLY AN IRON GROUP METAL OXIDE ON A CARRIER, WHICH CONTACT AGENT ABSORBS THE SULFUR CONTENT OF THE PETROLEUM HYDROCARBON WITH A CONCOMITANT CONVERSION OF THE IRON GROUP METAL OXIDE INTO IRON GROUP METAL SULFIDE, FOLLOWING WHICH THE CONTACT AGENT IS REGENERATED TO SUBSTANTIALLY ITS ORIGINAL FORM AND THE CONTACT ABSORPTION HYDRODESULFURIZATION PROCESS RENEWED, THE IMPROVEMENT FOR AVOIDING PRESSURE DROPS AND SURGES WHEN THE CONTACT ABSORPTION HYDRODESULFURIZATION PROCESS IS RENEWED DUE TO ABSORPTION OF HYDROGEN BY THE IRON GROUP METAL OXIDE AND FOR OBTAINING MORE PROLONGED CONTACT BETWEEN THE HYDROCARBON AND THE IRON GROUP METAL OXIDE WHICH COMPRISES BRINGING THE SYSTEM TO SUBSTANTIALLY THE OPERATING PRESSURE AFTER THE CONTACT AGENT HAS BEEN REGENERATED BY INTRODUCING A READILY LIQUEFIABLE LOW BOILING SATURATED HYDROCARBON GAS INTO THE CHAMBER CONTAINING THE REGENERATED CONTACT COMPRISING SUBSTANTIALLY THE IRON GROUP METAL OXIDE, AND WHEN SUBSTANTIALLY THE DESIRED PRESSURE HAS BEEN ATTAINED, AGAIN CONTACTING THE PETROLEUM HYDROCARBON AND HYDROGEN-CONTAINING GAS WITH THE IRON GROUP METAL OXIDE IN THE PRESSURED-UP CHAMBER.