What are the different types of tray efficiencies?
What are the different types of tray efficiencies?
The three main tray efficiency metrics are overall tray efficiency, Murphree Vapor efficiency and Baur Efficiency which are described below.
What are sieve trays?
Sieve trays are simple perforated plates with small holes about 5 to 6 mm (0.2 to 0.25 inch) in diameter. Valve trays are similar, except the perforations are covered by small metal disks that restrict the flow through the perforations under certain process conditions.
What is sieve tray?
The sieve tray is a flat perforated plate with no moving parts. Vapor rises from the holes/ perforations to the tray above, cross-current to the liquid flow. The vapor energy keeps the liquid from flowing down through the holes. Smaller sieves reduce weeping whereas larger sieves are employed in fouling services.
What is Murphy tray efficiency?
The Murphree plate efficiency is therefore expressed as the ratio of the increase in mole fraction of vapour of a volatile component passing through a plate in a column to the same increase when the vapour is in equilibrium. In effect, more stages are therefore required to bring about a desired separation.
What are the uses of a distillation column?
A distillation column is an essential item used in the distillation of liquid mixtures to separate the mixture into its component parts, or fractions, based on the differences in volatilities. Fractionating columns are used in small scale laboratory distillations as well as large scale industrial distillations.
What is sieve tray in distillation?
The “Sieve tray” is a perforated plate type tray , with holes punched into the deck-plate that typically measure from 3/16″ up through 1″ in diameter. Typically, a standard hole size can measure 0.5″ OD. Vapor comes out of the holes which in turn, keeps the liquid from weeping through. The vapor and liquid then, create a mix on the tray deck.
How do distillation columns function?
The primary function of a distillation column is the separation of a feed stream into (at least) one top product stream and one bottom product stream. The quality of the separation performed by a column can be judged from the purity of the top and bottom product streams.
What is a fractional distillation column?
Fractional distillation is a simple technique for accomplishing a large number of simple distillation/separations, in a single continuous operation. A fractionation column (fractional distillation column) has an extensive surface area for exchange of heat between ascending vapor and descending liquid (condensate).
