What causes the diesel produced by hydrocracking to turn yellow?
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When hydrogenation first started, the diesel produced was watery in color; however, in the past two days the diesel produced has become yellowish and cloudy. Tests have shown that there is no more sulfur or nitrogen in the diesel. The reaction temperature has been raised to 410 degrees; could there be some aromatic compounds in the raw materials that cannot be cracked?
Could this batch of diesel fuel contain metal impurities?
Firstly, the discoloration of diesel is related to unstable components contained within it, such as small molecular thiols, thiophenols, fatty acids, and basic nitrogen compounds; in particular, the presence of basic nitrogen compounds can easily trigger reactions that lead to discoloration. Secondly, the high residue content in cracked diesel also causes the color of the diesel to darken; therefore, it is possible to measure the residue value, and if it is high, the dry point of the diesel can be controlled during the distillation process.
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The raw material contains metal impurities, with a total metal content of 55