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Areas that require passivation cleaning after the hydrogenation unit is shut down
The reason for passivation is that ferrous sulfide, which is produced as a result of the reaction between hydrogen sulfide and iron, is prone to spontaneous combustion; therefore, equipment in the system where the hydrogen sulfide concentration is high, such as high-pressure and low-pressure units, reactors, and their associated pipelines, all require passivation.
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High scores, low scores, distillation columns, stripping columns, and their reflux tanks
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