Benzene hydrogenation; the hydrogenated oil contains 500 ppm of sulfur

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Eight hours after changing the feedstock, the sulfur content in the hydrogenation oil was 500 ppm; the xylene content in this feedstock tank was 15%. The temperature at the bottom of the evaporator decreased by 10°C, and the temperature difference in the main pre-reactor became smaller. The analysis of the circulating hydrogen gas showed a methane content of 30%, a hydrogen sulfide content of 15%, with a significant reduction in the hydrogen content. Many people think the problem lies in the composition of the raw materials; I believe it’s due to the presence of water, and on the other hand, a dealkylation reaction may have taken place. However, after water release, the temperature in the degassing tower remained high, and the sulfur content in the hydrogenation oil reached 8 ppm after 2 hours, resulting in an increased temperature difference. I seek advice from experts.