Process for treating a naphtha stream

Abstract

One exemplary embodiment can be a process for treating a naphtha stream. The process may include providing the naphtha stream to a fractionation zone. The fractionation zone may include a fractionation column producing a first stream having one or more C5 − hydrocarbons and a second stream withdrawn at a lower elevation on the fractionation column than the first stream and having one or more C5 + hydrocarbons, and sending at least a portion of the second stream to an aromatics complex for producing at least one of benzene, toluene, and para-xylene.

1 . A process for treating a naphtha stream, comprising:
 A) providing the naphtha stream to a fractionation zone comprising a fractionation column producing a first stream comprising one or more C5 −  hydrocarbons and a second stream withdrawn at a lower elevation on the fractionation column than the first stream and comprising one or more C5 +  hydrocarbons; and   B) sending at least a portion of the second stream to an aromatics complex for producing at least one of benzene, toluene, and para-xylene.   
     
     
         2 . The process according to  claim 1 , wherein the first stream comprises an overhead stream and the second stream comprises a bottom stream. 
     
     
         3 . The process according to  claim 1 , further comprising passing the naphtha stream through a thiol reduction zone prior to providing the naphtha stream to the fractionation zone. 
     
     
         4 . The process according to  claim 1 , wherein the naphtha stream comprises one or more C5-C12 hydrocarbons. 
     
     
         5 . The process according to  claim 1 , further comprising passing the second stream through one or more hydrogenation zones prior to the aromatics complex. 
     
     
         6 . The process according to  claim 5 , wherein the one or more hydrogenation zones comprises a first hydrotreating zone at a first reaction temperature effective to convert a portion of the sulfur content to hydrogen sulfide. 
     
     
         7 . The process according to  claim 6 , wherein the one or more hydrogenation zones comprises a second hydrotreating zone at a second, higher reaction temperature than the first hydrotreating zone and with a catalyst effective to desulfurize. 
     
     
         8 . The process according to  claim 1 , further comprising passing the second stream through one or more hydrodesulfurization zones prior to the aromatics complex. 
     
     
         9 . The process according to  claim 3 , wherein the thiol reduction zone comprises a reactor. 
     
     
         10 . The process according to  claim 9 , further comprising passing an oxygen-containing stream and an alkaline stream to a reactor in the thiol reduction zone. 
     
     
         11 . The process according to  claim 9 , wherein the reactor operates at a temperature of about 10-about 150° C., and about 1,100-about 7,000 KPa. 
     
     
         12 . A process for treating a naphtha stream, comprising:
 A) passing the naphtha stream to a thiol reduction zone;   B) passing at least a portion of an effluent from the thiol reduction zone to a fractionation zone comprising a fractionation column; and   C) obtaining a first stream comprising one or more C5 −  hydrocarbons and a second stream withdrawn at a lower elevation on the fractionation column than the first stream and comprising one or more C5 +  hydrocarbons.   
     
     
         13 . The process according to  claim 12 , further comprising passing an oxygen-containing stream and an alkaline stream to a reactor in the thiol reduction zone. 
     
     
         14 . The process according to  claim 13 , wherein the reactor operates at a temperature of about 10-about 150° C., and about 1,100-about 7,000 KPa. 
     
     
         15 . The process according to  claim 12 , wherein the naphtha stream comprises one or more C5-C12 hydrocarbons. 
     
     
         16 . The process according to  claim 12 , further comprising passing the second stream through a first hydrotreating zone and then a second hydrotreating zone wherein the second hydrotreating zone is at a second, higher reaction temperature than the first hydrotreating zone. 
     
     
         17 . The process according to  claim 12 , wherein the first stream comprises an overhead stream and the second stream comprises a bottom stream. 
     
     
         18 . A process for treating a naphtha stream, comprising:
 A) passing the naphtha stream to a thiol reduction zone;   B) passing at least a portion of an effluent from the thiol reduction zone to a fractionation zone comprising a fractionation column;   C) obtaining a first stream comprising one or more C5 −  hydrocarbons and a second stream withdrawn at a lower elevation on the fractionation column than the first stream and comprising one or more C5 +  hydrocarbons; and   D) passing the second stream through a first hydrotreating zone and then a second hydrotreating zone wherein the second hydrotreating zone is at a second, higher reaction temperature then the first hydrotreating zone.   
     
     
         19 . The process according to  claim 18 , further comprising passing an oxygen-containing stream and an alkaline stream to a reactor in the thiol reduction zone. 
     
     
         20 . The process according to  claim 19 , wherein the reactor operates at a temperature of about 10-about 150° C., and about 1,100-about 7,000 KPa.