Hydrogen chloride distillation
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Hydrogen chloride gas contains small amounts of organic impurities, and it is purified through distillation after being pressurized to 15 bar. The temperature of the gas under this pressure is over 170 degrees. I would like to ask: should the distillation be carried out at this temperature of over 170 degrees, or should the gas be cooled to around 30 degrees before distillation, or cooled to the bubble point? What are the principles? Feeding superheated gas can save cooling capacity and steam consumption, but there is a large difference in temperature with the feed plate, and the gas-liquid loads in the distillation section and the stripping section differ significantly. Feed is added in a bubbling manner; the gas-liquid loads in the distillation section and the stripping section are equal, and the diameters of the two sections of the tower are the same, although large amounts of cooling capacity and steam are required. How should this feeding condition be handled?
Gas-phase feeding requires more cooling capacity than bubble-point feeding; aside from refrigeration, the heating costs are generally higher than the cooling costs