The principles and practices for mist-removal are presented by southern-facing skylights, zigzag roof configuration, mist-exhaust tower, flux condensers and combined mist removal system.

The quality of vacuum distillates is closely related to the configuration of feeding part of the vacuum tower for crude distillation.

According to the current research research result, in this paper, reaction tower, air distributor, internals, exit configuration, separator and solids return feeder are expatiated.