A New Downstream Process Design for a Fluid Catalytic Cracking Unit to Raise Propylene Yield and Decrease Gasoline Olefin Content |
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| Authors: | X. Li G. Li Z. Xu H. Sui |
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| Affiliation: | 1. School of Chemical Engineering and Technology, Tianjin University , Tianjin, China;2. National Engineering Research Center for Distillation Technology , Tianjin, China;3. School of Chemical Engineering and Technology, Tianjin University , Tianjin, China;4. Daqing Refining &5. Chemical Company of China National Petroleum Corporation , Daqing, China |
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| Abstract: | Abstract Based on the paraffins, olefins, naphthenes, aromatics (PONA) composition of crude light gasoline, crude heavy gasoline, stabilized gasoline, and wet gas of a pilot plant fluid catalytic cracking (FCC) unit, it was found that the root cause of high gasoline olefin content and low propylene yield was low C5 and C6 olefin content of crude light gasoline. A new design for the main fractionater and absorber–stripper–stabilizer was presented to obtain stabilized light gasoline that contains more C5 and C6 olefins recracked in the secondary riser. Industrial studies on the revamped unit showed that gasoline olefin content was decreased markedly, though research octane number (RON) was preserved. In addition, propylene yield was raised to a higher level and unit energy consumption (or operating cost) was not increased. |
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| Keywords: | energy consumption FCC olefin content propylene stabilized gasoline |
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