Glassware Products

Distillation Traps - Sigma-Aldrich Glassware Catalog


Apparatus  •  Columns  •  Packing  •  Heads  •  Traps

Dean-Stark Traps • Cold-Traps & Vacuum Traps


On this page:
Dean-Stark trapsJacketed Dean-Stark trapModified Dean-Stark apparatus
Modified, jacketed Dean-Stark trap"N"-tubes



Dean-Stark traps

Designed specifically for azeotropic distillation using solvents lighter than water. Each Dean-Stark trap comes standard with a 4mm bore PTFE stopcock. The 12mL and 25mL traps use a 2mm bore stopcocks.

Cap.
(mL)
Height
(mm)
Side-arm
clearance (mm)
Suggested
flask size
S.T. 14/20 Joints
Catalog Number
S.T. 24/40 Joints
Catalog Number
S.T. 29/32 Joints
Catalog Number
12
205
80
50mL - 5L
-
-
25
255
80
50mL - 5L
-
-
25
280
80
50mL - 5L
-
100
350
100
5L - 12L
-
300
440
170
22L - 50L
-
500
455
170
22L - 50L
-


Back to top

Jacketed Dean-Stark trap


For azeotroping large amounts of water, 325mL capacity. With S.T. 24/40 joints and 4mm bore PTFE stopcock.

Z10,257-1













Back to top

Modified Dean-Stark apparatus



The 8mL reservoir version is specifically designed for small scale azeotropic distillation of valuable solvents using heavy water. 2mm bore PTFE stopcock, 300mm overall height.

The modified Dean-Stark technique
(See Fig. 1)
  • Solvent vapors condense and collect in the receiver
  • The modified Dean-Stark trap separates the two components
  • The heavier than water layer sinks to the bottom of the trap leaving the water on top
  • The solvent is forced back through the inside tube and returned to the boiling flask
  • The upper water layer is drained out through the 2mm PTFE stopcock

Reservoir cap. (mL)
S.T. Joint 24/40
Catalog Number
S.T. Joint 29/32
Catalog Number
8
35


Back to top



Modified, jacketed Dean-Stark trap



350mL capacity. 0-3mm PTFE valve. 300mm overall height.

Z24,960-2

Back to top


"N"-tubes


For small-scale distillation. 10mL capacity.

Description
Catalog Number
S.T. 19/38F, 24/40M joints
S.T. 24/40 joints


Back to top