What is Dean-Stark apparatus used for?
What is Dean-Stark apparatus used for?
The Dean–Stark apparatus, Dean–Stark receiver, distilling trap, or Dean–Stark Head is a piece of laboratory glassware used in synthetic chemistry to collect water (or occasionally other liquid) from a reactor.
What is azeotropic composition?
An azeotropic mixture is a mixture of substances that has the same concentration of vapour and fluid phases. It is basically a mixture that contains two or more liquids. A zeotropic mixture basically has constant or the same boiling points and the mixtures’ vapour will also have the same composition as the liquid.
How do you remove water from toluene?
Toluene can be predried using CaCl2, CaH2, or CaSO4 and is most commonly dried by heating over sodium with benzo- phenone as indicator. 1 Such treatment (Na/benzophenone) reduced the water content from 225 ppm to about 34 ppm in our hands (Table 2).
What is the advantage of reflux condenser?
A reflux apparatus allows for facile heating of a solution, but without the loss of solvent that would result from heating in an open vessel. In a reflux setup, solvent vapors are trapped by the condenser, and the concentration of reactants remains constant throughout the process.
What is the function of the condenser in the reflux process?
The reflux condensation technique utilizes the boiling of a liquid in a vessel connected to a condenser, called the reflux condenser, which enables the continuous condensing of the liquid for reboiling. Reflux condensers enable the continuous condensing of a liquid by reboiling it.
What was the purpose of the Dean Stark reactor?
It is used in combination with a glass condenser and a reactor for continuous removal of the water that is produced during a chemical reaction performed at reflux temperature. It was invented by the American chemists Ernest Woodward Dean (1888–1959) and David Dewey Stark (1893–1979) in 1920 for determination of the water content in petroleum.
What should the temperature be in the Dean Stark trap?
Set the oil bath temperature to 170 °C and heat the reaction mixture to reflux. Monitor the reaction by measuring the water amount in the Dean-Stark trap. The reaction is done when no further water becomes trapped in the side arm of the Dean-Stark trap.
What kind of apparatus is the Dean Stark apparatus?
The Dean–Stark apparatus typically consists of a vertical cylindrical glass tube, often with a volumetric graduation along its full length and a precision stopcock at its lower end, very much like a burette. The lower end of a reflux condenser fits into the top of the cylinder.
How to make the Dean Stark oil bath?
Take a 250 mL round bottom flask equipped with a magnetic stir bar. Place an oil bath under the round bottom flask on a magnetic stirrer. Fill the round-bottom flask with 7.5 g (0.05 mol) m -Nitrobenzaldehyde and add 75 mL of toluene. Add 3.1 mL (3.45 g, 0.055 mol) ethylene glycol. Attach the Dean-Stark trap to the round bottom flask.
