What is the reason for the light yellow-green color of hydrocracked diesel?
Thread Content
The hydrocracked diesel is light yellow-green in color, but colorimetric analysis results show no change in its color. The temperature at the inlet of both the refining reactor and the upgrading reactor was increased by five degrees, yet the diesel remained light yellow-green – could this be due to the properties of the raw material?
What about the quality of the raw materials? Can I take a look?
Pale yellow-green may be the result of aromatic hydrocarbons forming a substance that affects the color of the entire diesel fraction. It is caused by the high content of aromatic hydrocarbons in the raw materials.
Later, we analyzed the aromatic content in the crude oil and refined diesel; the aromatic content in the crude oil was less than 20%, while that in the refined diesel was less than 2%. Yet the color remained the same, which is probably due to the high aromatic content in the crude oil. . .
It is recommended to consult with catalyst suppliers. When I evaluated catalysts in my laboratory previously, some of them used catalytic diesel at 8 MPa and 365°C; although they achieved high removal rates for aromatics, sulfur, and nitrogen, the resulting oil was yellow-green in color.
It’s likely the heat exchanger is leaking; check it
How dry should the raw materials be? What color is the tail oil?
High aromatic content; sometimes it may also be due to excessive hydrogenation
Could you explain it in more detail? What are the ways to solve it?
1. The heat exchanger for diesel and raw materials is leaking. 2. The cracking reaction temperature is too high. Generally, the color of diesel is related to nitrogen; is the nitrogen content in your raw materials high?