Why does the crude gasoline obtained from the top of the catalytic cracking fractionation tower turn light yellow?
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The crude gasoline coming from the top of the fractionation tower in the catalytic cracking unit has turned light yellow on two occasions (it should be white normally), but after 4 to 8 hours, sampling showed that its color returned to normal. The cause has not been identified yet; I was wondering if anyone else has encountered this issue. Any advice would be appreciated The following aspects have been ruled out: 1. There were no fluctuations in the operation of the distillation tower, and all process parameters remained within the specified ranges. 2. The distillation range (dry point) of the crude gasoline sample analyzed was satisfactory, with no increase in density observed ； But the gum content in gasoline increases. I wonder if other substances in crude gasoline are responsible for the reaction; could there be other reasons as well? How to judge and analyze?
1. Changes in raw materials lead to product instability. 2. The catalyst’s activity decreases, affecting the reaction and resulting in unstable products.
1. Changes in raw materials lead to product instability. 2. The catalyst’s activity decreases, affecting the reaction and resulting in unstable products.
Reply to 3# jbcyf: Thank you to the users on floor 2 and floor 3! But is there any way to analyze what substances are responsible for the discoloration of crude gasoline? How to analyze?