Heavy gasoline treating , process

Phases of processing other than heavy-oil distillation processes are discussed in many chapters, particularly under treating (Chaps. 10-11), dewaxing (Chap. 12), thermal cracking (Chap. 19), chemical manufacture (Chap. 20), catalytic cracking and reforming (Chap. 21), and natural gasoline (Chap. 22). 

This term is used to describe oils that have a flash point above ambient temperature. They will therefore not burn or explode at ambient temperature but will do so when hot. Unfortunately many people do not realize this and treat heavy oils with a disrespect that they would never apply to gasoline, as shown by the incidents described below. Another incident was described in Section 12.2 (c). Heavy oils are widely used as fuel oils, solvents, lubricants, and heat transfer oils, as well as process materials. 

Exploratory research showed that treating a heavy MTG gasoline fraction could reduce durene levels sufficiently to meet the specification. Subsequent process development in isothermal and adiabatic bench-scale units confirmed this. 

While this heavy LCO material could be shifted to other markets, this does not necessarily have to be the case. Under certain conditions, this material can be recycled to the FCC unit . For this to be feasible, the refiner must hydrotreat the FCC feed at a pressure sufficient to desulfurize the sterically hindered sulfur containing compounds and the feed hydrotreater must have sufficient excess capacity to handle the additional material. This material could also be sent to an existing hydrocracker, if sufficient capacity existed, and converted into gasoline blendstock. Alternatively, it could be hydrotreated separately under more severe conditions to remove the sulfur, such as with SynAlliance s SynShift process . This would entail higher hydrogen consumption per barrel of treated material because of some aromatic saturation. However, the amount of material being processed would... 

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