UOP continuous reforming, C6 removal column pressure control
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There is a pressure difference displayed between the top and bottom pressures of the C6 removal tower; no control is provided for this. The gas at the tower top passes through air cooling before reaching the reflux tank. The pressure in the reflux tank is controlled by a self-acting control valve that introduces nitrogen. Does ensuring the pressure in the reflux tank automatically ensure the pressure at the tower top as well?
There should also be an appropriate reflux ratio to ensure effective fractionation