Reasons for the yellowing of aromatic gasoline
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Yesterday, the aromatic gasoline was yellow in color; the throughput was 10 t/h for naphtha and 5 t/h for liquefied gas, with the olefin content in the liquefied gas being around 40%. Is it caused by an excessive content of olefins? What are the reasons for the yellowing of aromatic gasoline? Or everyone could share their feed/operating parameters, thank you! !
Yellowing of aromatized gasoline: 1. It is due to the naphtha itself – it has a darker color and a complex composition； 2. The ratio of naphtha to olefin liquefied gas in your mixture is not low; the aromatic oil resulting from the conversion of olefins is slightly yellowish in color ； 3. The aromatization reaction is intense, and the heavy components have not been completely removed ； 4. If just starting up, the issue of a relatively dirty system also needs to be taken into account
The color of the raw naphtha is fine; from the perspective of the dry point of aromatic gasoline, the impact of heavier components is minimal. The olefin content in the raw liquefied gas has indeed increased. What is the reason/ principle behind the slight yellowing of the aromatic oil that results from the conversion of olefins? Thank you