The color of the lubricating oil after hydrogenation, following treatment with a supplementary refining catalyst, is not good
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We kindly ask for guidance from our fellow professionals. Our plant carries out frequent catalyst replacements; after a process of hydrodesulfurization using solvent oil, the color of the product remains poor even two days after another catalyst replacement. Upon investigating the issue, we found that the flow rate of recycled hydrogen was showing incorrect readings. Even after correcting this value, the color still remained poor, so we had to carry out another catalyst replacement. Yet once again, the color failed to return to normal. Previously, this material had a Zeebe color value of +30; now it’s only +19.
Has the nitrogen in the raw materials increased?
How to carry out hydrorefining? How to replenish refined substances? What catalyst to use?