Perkin Triangle
Get Perkin Triangle essential facts below. View Videos or join the Perkin Triangle discussion. Add Perkin Triangle to your topic list for future reference or share this resource on social media.
Perkin Triangle
Perkin triangle
Perkin triangle distillation apparatus.svg
A Perkin triangle distillation setup

InventorWilliam Henry Perkin
Related itemsVacuum distillation

A Perkin triangle is a specialized apparatus for the distillation of air-sensitive materials. It is named after William Henry Perkin Jr., whose design was approximately triangular in shape.[] The diagram shows a more modern version, in which the glass taps have been replaced with more air-tight Teflon taps.

Some compounds have high boiling points and are sensitive to air. A simple vacuum distillation system can be used, whereby the vacuum is replaced with an inert gas after the distillation is complete. However, this is a less satisfactory system if one desires to collect fractions under a reduced pressure. To do this, a "pig" adapter can be added to the end of the condenser, or for better results or for very air-sensitive compounds, a Perkin triangle apparatus can be used.

The Perkin triangle uses a series of glass or Teflon taps to allow fractions to be isolated from the rest of the still, without the main body of the distillation being removed from either the vacuum or heat source, so that the reflux may continue. To do this, the sample is first isolated from the vacuum by means of the taps. The vacuum over the sample is then replaced with an inert gas such as nitrogen or argon. The collection vessel or still receiver can then be removed and stoppered. Finally, a fresh collection vessel can be added to the system, evacuated, and linked back to the distillation system through the taps to collect the next fraction. The process is repeated until all fractions have been collected.

Solvent drying

A Perkin triangle is also a convenient device for drying solvents. The solvent can be allowed to reflux over a drying agent housed in the still pot (shown as 2 in the figure) for a suitable time to dry solvent. The collecting tap (shown as 5 in the figure) can then be opened to collect the solvent in a Schlenk flask for storage. Depending on the boiling point of the solvent, a vacuum can be applied.

Reference textbook

  • John Leonard; B. Lygo; Garry Procter (2 June 1994). Advanced practical organic chemistry. pp. 198-200. ISBN 9780748740710.

External links

Royal Society of Chemistry: Classic Kit: 'Perkin's' triangle: [1]

  This article uses material from the Wikipedia page available here. It is released under the Creative Commons Attribution-Share-Alike License 3.0.



Music Scenes