What are tray columns used for?
A plate column (or tray column) is a chemical equipment used to carry out unit operations where it is necessary to transfer mass between a liquid phase and a gas phase. In other words, it is a particular gas-liquid contactor.
What are the types of trays in column?
There are five major types of tray column; bubble cap tray, sieve deck tray, dual flow tray, valve tray and baffle tray.
What is the role of tray in tray tower?
The function of a tray is to facilitate contact between the vapour phase and liquid phase so that mass transfer between the 2 phases can take place. Each tray can be considered as being made up of 3 sections: weir, bubbling area, and downcomer as shown in the Figure below.
What is a sieve tray column?
Sieve Trays 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.
What is the difference between tray column and packed column?
Plate Column or Tray Tower Plate column is used for relatively large diameter & a large number of stages. A packed column is suitable for low-capacity operation. Plate column can handle a wider range of gas and liquid flow rates.
How does plate column work?
A liquid feed containing the mixture of two or more liquids enters the column at one or more points. The liquid flows over the plates, and vapor bubbles up through the liquid via holes in the plates.
What is tray in distillation column?
Trays are separation devices used in process plants, most often in distillation towers. The tray column is one the most widely used types of distillation columns. It is also at times referred to as a plate column.
What is a tray distillation column?
The tray column is one the most widely used types of distillation columns. It is also at times referred to as a plate column. The number of trays and stages in the column is designed for the desired purity and difficulty of the separation process. Height of the column also determines the number of stages.
What are tray towers?
A vertical process tower for liquid-vapor contacting (as in distillation, absorption, stripping, evaporation, spray drying, dehumidification, humidification, flashing, rectification, dephlegmation), along the height of which is a series of trays designed to cause intimate contact between the falling liquid and the …
What are capillary columns?
Capillary columns are gas chromatography (GC) columns that have the stationary phase coating their inner surfaces rather than being packed into the cavity. Capillary GC columns are used to analyze samples for the individual chemical compounds that they contain.
What is a tray in a distillation column?
When would you use a tray tower?
Tray towers are better at handling solids or other sources of fouling. Tray towers are better at handling lower liquid rates. Packed towers are better for corrosive liquids. Packed towers are better at handling foaming systems.
What is the difference between packed and tray columns?
What is a tray column?
The tray column is one the most widely used types of distillation columns. It is also at times referred to as a plate column. The number of trays and stages in the column is designed for the desired purity and difficulty of the separation process.
What determines the number of trays and stages in a column?
The number of trays and stages in the column is designed for the desired purity and difficulty of the separation process. Height of the column also determines the number of stages. Liquid flows down the column and across the trays after the liquid enters in crossflow or countercurrent flow.
What is the distance between adjacent trays in a column?
Tray Spacing The vertical distance between adjacent trays varies from 450 to 900 mm in the columns generally employed in the chemical process industries (CPI), as seen in Table 1. Spacing involves a tradeoff between column height and column diameter; with greater tray spacing, the column height increases, while the required diameter decreases.
What is a column?
What is Column? – Definition, Facts & Example An arrangement of numbers, shapes or objects, one above the other. A rectangle which has length, longer than width.