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A process for desulfurizing a gasoline stream while continuing to maintain the octane rating of the blend stock. A gasoline stream containing sulfur compounds and olefins is introduced into a fractionation zone to produce a low boiling fraction containing mercaptan sulfur compounds and olefins, a mi

A process for desulfurizing a gasoline stream while continuing to maintain the octane rating of the blend stock. A gasoline stream containing sulfur compounds and olefins is introduced into a fractionation zone to produce a low boiling fraction containing mercaptan sulfur compounds and olefins, a mid boiling fraction containing thiophene and olefins, and a high boiling fraction containing sulfur compounds. The low boiling fraction containing mercaptan sulfur compounds is contacted with an aqueous alkaline solution to selectively remove mercaptan sulfur compounds. The mid boiling fraction containing thiophene is extracted to produce a raffinate stream containing olefins and having a reduced sulfur content relative to the mid boiling fraction and a hydrocarbonaceous stream rich in thiophene. The resulting hydrocarbonaceous stream rich in thiophene and the higher boiling fraction containing sulfur compounds is reacted in a hydrodesulfurization reaction zone to produce a hydrocarbonaceous stream having a reduced sulfur concentration.

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A process for desulfurizing a gasoline stream while continuing to maintain the octane rating of the blend stock. A gasoline stream containing sulfur compounds and olefins is introduced into a fractionation zone to produce a low boiling fraction containing mercaptan sulfur compounds and olefins, a mi

A process for desulfurizing a gasoline stream while continuing to maintain the octane rating of the blend stock. A gasoline stream containing sulfur compounds and olefins is introduced into a fractionation zone to produce a low boiling fraction containing mercaptan sulfur compounds and olefins, a mid boiling fraction containing thiophene and olefins, and a high boiling fraction containing sulfur compounds. The low boiling fraction containing mercaptan sulfur compounds is contacted with an aqueous alkaline solution to selectively remove mercaptan sulfur compounds. The mid boiling fraction containing thiophene is extracted to produce a raffinate stream containing olefins and having a reduced sulfur content relative to the mid boiling fraction and a hydrocarbonaceous stream rich in thiophene. The resulting hydrocarbonaceous stream rich in thiophene and the higher boiling fraction containing sulfur compounds is reacted in a hydrodesulfurization reaction zone to produce a hydrocarbonaceous stream having a reduced sulfur concentration. tion of the exposure index comprises displaying the exposure index. 4. The method of claim 2, wherein the method further comprises recording data representative of the monitored environmental factors. 5. The method of claim 2, wherein the method further comprises continuously updating the exposure index. 6. The method of claim 1, wherein the method further comprises inspecting the object as a function of the exposure index. 7. The method of claim 1, wherein monitoring one or more environmental factors associated with corrosion of materials comprises sensing at least one of chloride ion concentration and pH in the environment. 8. The method of claim 7, wherein monitoring one or more environmental factors further comprises at least one of sensing humidity. 9. The method of claim 7, wherein monitoring one or more environmental factors comprises sensing temperature in the environment. 10. The method of claim 9, wherein the method further comprises correcting temperature dependence of one or more sensors used to monitor the environment based on the sensed temperature. 11. The method of claim 7, wherein monitoring one or more environmental factors comprises measuring free potential of a material positioned in the environment, wherein the object is formed at least in part of such a material. 12. The method of claim 11, wherein the method further comprises verifying the exposure index using the measured free potential of the material. 13. The method of claim 1, wherein calculating an exposure index comprises calculating the exposure index as a function of a real-time measure of at least one of chloride ion concentration and pH. 14. The method of claim 13, wherein calculating an exposure index further comprises calculating the exposure index as a function of a real-time measure of at least one of temperature and humidity. 15. The method of claim 13, wherein calculating the exposure index comprises calculating the exposure index as a function of a real-time measure of chloride ion concentration, pH, temperature and humidity. 16. A monitoring apparatus for monitoring an environment in which an object is located, comprising: one or more sensors, wherein each sensor is operable to detect the presence of at least one environmental factor associated with corrosion of materials and provide real-time sensor signals representative of the detected environmental factor, and a processing unit operable to receive the sensor signals generated by the one or more sensors, wherein the processing unit is operable to provide a real-time calculation of an exposure index representative of an actual cumulative exposure of the object to the at least one environmental factor as a function of the a real-time measure of each individually received sensor signals. 17. The apparatus of claim 16, wherein the apparatus further comprises an indication device indicating the exposure index. 18. The apparatus of claim 17, wherein indication device comprises a display. 19. The apparatus of claim 17, wherein the indication device continuously updates an indicated exposure index. 20. The apparatus of claim 16, wherein the apparatus further comprises memory to store data representative of at least one of the exposure index and data representative of the sensor signals. 21. The apparatus of claim 16, wherein the one or more sensors comprise at least one of a chloride ion concentration sensor and a pH sensor. 22. The apparatus of claim 21, wherein the one or more sensors further comprise at least one humidity sensor. 23. The apparatus of claim 21, wherein the one or more sensors further comprise a temperature sensor. 24. The apparatus of claim 16, wherein the one or more sensors further comprise a sensor to measure free potential of a sample material positioned in the environment, wherein the object is formed at least in part of such a material. 25. The apparatus of claim 16, wherein the one or more sensors comprise at least a chloride ion concentration sensor, a pH sen sor, a temperature sensor, and a humidity sensor, and further wherein the processing unit provides the real-time calculation of the exposure index as a function of real-time sensor signals from the at least chloride ion concentration, pH, temperature and humidity. 26. The apparatus of claim 16, wherein the one or more sensors are removable from a sensor module housing such that one or more additional sensors can be substituted therefor. 27. The apparatus of claim 16, wherein the one or more sensors are associated with a module that is separate from a module containing the processing unit. 28. A monitoring method for monitoring an environment in which an object is located, the method comprising: monitoring at least chloride ion concentration and pH in the environment; and calculating, in real-time, an exposure index representative of an actual cumulative exposure of the object to a real-time measure of at least chloride ion concentration and pH. 29. The method of claim 28, wherein the method further comprises displaying the exposure index. 30. The method of claim 29, wherein the method further comprises continuously updating and displaying the exposure index. 31. The method of claim 28, wherein monitoring at least chloride ion concentration and pH further comprises sensing a real-time measure of humidity in the environment. 32. The method of claim 28, wherein monitoring at least chloride ion concentration and pH further comprises sensing a real-time measure of temperature in the environment.