| 摘要 |
Fouling is at least minimized when heating in a distillation unit a stream comprising C4 or C5 diolefins by a method wherein said distillation unit is flushed with an inert gas, thereafter nitric oxide is introduced in an amount ranging from 0.15 to 500, preferably from 5 to 30 gm of nitric oxide per square meter of internal surface area of said heating unit, the heating unit is thereafter flushed with inert gas and the C4 or C5 diolefin stream is introduced into the heating unit. This method may be applied to a depropanizer or a debutanizer the desorber and re-distillation of the CAA process for butadiene recovery, the extractive distillation, stripping tower and re-distillation of the ACN process for isoprene recovery, or extractive distillation, stripping tower and re-distillation of the ACN process for isoprene recovery. |
