Problems such as drying, presulfurization in high-pressure hydrocracking
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The operating pressure for high-pressure hydrocracking is 17.5 Mpa; what pressure is required to ensure airtightness with nitrogen? What is the pressure during drying and pre-vulcanization?
When nitrogen is compressed to 2 MPa, there is a tendency for the pressure at the compressor’s exhaust valve to increase; depending on the exhaust temperature of the compressor, this pressure can rise to 4 MPa. Hydrogen is the better gas to use for compression, as nitrogen molecules have a high molecular weight and are difficult to compress. Drying and presulfurization should be carried out in accordance with the temperature increase curves and presulfurization protocols provided by the catalyst manufacturer
For nitrogen tightness, it depends on the requirements of the new hydrogen compressor; the pressure for presulfurization is generally the operating pressure, or slightly lower.