Nitrogen in heavy naphtha exceeds standard
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The hydrocracking unit of our plant has newly started construction, and it was recently discovered that the nitrogen content in heavy naphtha exceeds the standard (0.8~1.0ppm, the nitrogen content of reforming feed is required to be ≤0.5ppm). The nitrogen in the purification reaction effluent has always been well controlled, about 5~8ppm. I would like to ask you to help analyze what causes the excessive nitrogen content in heavy naphtha.
The nitrogen content in naphtha is related to many factors. The temperature of the refining reactor, the system pressure, the nitrogen content in the raw material, the corrosion inhibitor at the top of the stripping tower, and the use of medium-pressure deoxygenated water as wash water are all influencing factors.