Patent ID: 8628656
Filing Date: 2014-01-14
Classification: C10G

Abstract:
1. A process for the hydrodesulfurization of a cracked naphtha, comprising: feeding a cracked naphtha to a fixed bed single pass reaction zone having an inlet and an outlet and containing a hydrodesulfurization catalyst, wherein a portion of the organic sulfur compounds in the cracked naphtha are reacted with hydrogen to produce H recovering an effluent from the fixed bed single pass reaction zone via the outlet and feeding the effluent to a separation zone to remove H analyzing the stripped effluent to determine a boiling temperature at which the stripped effluent exhibits a maximum rate of decline of bromine number on a bromine number—temperature plot; feeding the stripped effluent to a fractionator to separate the stripped effluent into a light fraction and a heavy fraction having an ASTM D-86 initial boiling point within 30° F. of the boiling temperature at which the analysis of the stripped effluent indicates a maximum rate of decline of bromine number on a bromine number—temperature plot; recovering the light fraction as an overheads from the fractionator; recovering the heavy fraction as a bottoms from the fractionator; recycling at least a portion of the heavy fraction to the fixed bed single pass reaction zone, wherein a ratio of recycled heavy fraction to the cracked naphtha fed to the fixed bed single pass reaction zone is in the range from about 0.25:1 to about 10:1.