What is tray in distillation?

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. The number of trays and stages in the column is designed for the desired purity and difficulty of the separation process.

What is the use of trays in distillation column?

The trays have openings to allow vapor to flow upward through the column, as well as conduits (downcomers) to allow condensed liquid to flow downward (Figure). The tray is designed to promote intimate contact between the upward-moving vapor and downward-moving liquid.

What are the different types of trays?

  • Fast Food Serving Trays. One of the most common types of serving trays that you will see on a regular basis will be fast food serving trays.
  • Serving Trays with Compartments.
  • Appetizer Serving Trays.
  • Tea Serving Trays.
  • Plastic Serving Trays.
  • Wooden Serving Trays.
  • Metal Serving Trays.
  • Fiberglass Serving Trays.

What is sieve tray distillation 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.

How does a distillation tray work?

The distillation column is made up of a series of stacked plates. 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. In essence, the hot mixture is pumped into the bottom.

What is baffle tray?

Baffle, disc-and-donut and showerdeck trays Ascending vapour contacts the liquid by passing through the liquid curtains. These trays are used in washing sections where fouling resistance has priority over high efficiency.

What is the main function of the tray?

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.

What is a waiters tray called?

A bar tray is a flat, round tray specially designed for carrying glassware. Also known as a waiter’s tray, they are most commonly used by waiters and bar staff. They are circular to help the user balance the tray with one hand while serving and carrying.

Which tray is the costliest type of tray?

The cost of bubble cap tray is by far the highest. 6. 6 typesanddesignof the towerstrays Mohamedsalah B. Sieve Tray Sieve tray is perforated plate with holes punched into the plate and usually has holes 3/16 in to 1 in diameter.

How does a tray work?

Liquid runs across the plate. Vapor bubbles up through the holes. If liquid only runs across part of this plate, vapor will still bubble up through the holes in the whole plate. The vapor bubbling up through that portion of the tray deck where the liquid flow is active will mix with the flowing liquid.

What are the four types of distillation?

Types of Distillation

  • Simple distillation.
  • Fractional distillation.
  • Steam distillation.
  • Vacuum distillation.
  • Air-sensitive vacuum distillation.
  • Short path distillation.
  • Zone distillation.

What is sieve tray?

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 are the different types of distillation trays?

Each tray effects a portion of the separation before the vapor and liquid move to the next tray in the column until the desired concentrations (purities) are reached. Common types of trays include bubble-cap trays, valve trays, and sieve trays.

Which is the most common type of distillation column?

Trays are the most commonly selected type of distillation column. Trayed Columns utilize a pressure and temperature differential to separate the products. For most tray columns, the weir holds a liquid level of each tray. The vapor must overcome this liquid head to move up the column.

How does liquid move from top to bottom in a distillation column?

Passage of liquid from the top tray to the bottom of tray occurs via downcomers. Downcomers are conduits having circular, segmental, or rectangular cross sections that convey liquid from upper tray to a lower tray in a distillation column.

How does a baffle tray work in a distillation column?

For a baffle tray column the gas flows upwards through the baffle openings and in doing so contacts the liquid showering down from one baffle to the next. Baffle tray columns have almost same flooding capacity as cross flow trays.