Dean and Stark Apparatus
Product Code : EL-BTLE-10446
Quick Answer: The Dean and Stark Apparatus is used to determine the water content of bitumen and petroleum products by azeotropic distillation, per ASTM D95, ASTM D244, EN 1428 and IP 74. It consists of a vertical cylindrical glass tube (made of 3.3 borosilicate glass), often with a volumetric graduation along its full length and a precision stopcock at its lower end, much like a burette, connected via a sloping side-arm to a heated reaction flask and, at the top, to a reflux condenser. As the reaction flask is heated, vapor containing the reaction solvent and water travels up into the condenser, cools, and drips into the distilling trap, where the immiscible water and solvent separate into layers; the solvent layer flows back to the reactor once it reaches the side-arm level, while the water collects in the trap until it must be drained into the receiving flask. It has a 1000 ml capacity and includes a graduated 10 ml receiver with 0.1 intervals.
The Dean And Stark Apparatus typically consists of 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, made of 3.3 borosilicate glass. The lower end of a reflux condenser fits into the top of the cylinder, and immediately below the joint between the condenser and the cylinder is a sloping side-arm that joins the cylinder to a reaction flask; at the lower end the side-arm turns sharply downward, so that the side-arm is connected to the reaction flask by a vertical tube.
The reaction flask is heated, and boiling chips within it assist with the calm formation of bubbles of vapor containing the reaction solvent and the component to be removed. This vapor travels out of reaction flask up into the condenser where water being circulated around it causes it to cool and drip into the distilling trap. Here, the immiscible liquids separate into layers (water below and solvent above it). When their combined volume reaches the level of the side-arm, the upper, less-dense layer will begin to flow back to the reactor while the water layer will remain in the trap.
The trap will eventually reach capacity when the level of the water in it reaches the level of the side-arm. At this point, the trap must be drained into the receiving flask. The process of evaporation/ condensation/ collection may be continued until it ceases to produce additional amounts of water. Uniform wall distribution of the Flask makes it suitable for heating. Consists of a graduated 10 ml Receiver with 0.1 intervals.
Technical Specifications :
Capacity (ml): 1000 ml
Material: Borosilicate Glass
Glass Thickness: 0.5-5 mm
Application: Chemical Laboratory
Color: Transparent
Standards: ASTM D95, ASTM D244, EN 1428, IP 74
Contact Engineering Lab Equipment for your School, College Civil and Mechanical Engineering Lab Instruments. We are the best and renowned engineering educational equipment, engineering equipments exporters, engineering equipments suppliers, engineering equipments supplier, engineering educational equipments, engineering equipments manufacturers in Ambala, India.
Last Updated: September 2026
Related Products: Reflux Extractor 4000 Gms, Solvent Recovery Unit, Cut Back Bitumen Distillation Equipment, Centrifuge Extractor Hand Operated
