A clip assembly for holding down a member in a vessel comprising a clip comprising a first panel comprising a tab extending from the first panel and a protrusion extending from the first panel, and a second panel integral with and normal to the first panel for engaging the member. A wall in the vessel comprises a cut-out adapted to receive the tab and a recess disposed laterally to the cut-out and adapted to receive the protrusion upon inserting the tab into the cut-out and sliding the tab in the cut-out laterally with respect to the recess. The subject matter also pertains to the clip itself and the method of use.

A high capacity and high efficiency vapor-liquid contacting apparatus and process is useful in distillation columns and other vapor-liquid contacting processes. The apparatus is characterized by a half module comprising a downcomer against a shell of a vessel for transporting liquid to a subjacent stage which utilizes a demister to effect vapor-liquid separation at the downcomer outlet.

Refinery apparatus including a distillation column partitioned into a first and second region with a partition wall therebetween in a bottom region thereof, the distillation column including a feed supply port at one side of a middle region, a first outlet provided below the first region, a second outlet provided below the second region and connected to one side of a reboiler, and a reflux inlet provided above the second region and connected to the other side of the reboiler, and a plurality of trays arranged vertically apart from the partition wall provided in the middle region, where one end of a lowest tray among the plurality of trays is opened so as not to contact a side of the distillation column on the first region, and a guide baffle extends downward from one end of the lowest tray to be adjacent to a bottom of the distillation column.