A compact fractionation unit for distilling small quantities in a vacuum, and for ordinary separation. Column is vacuum jacketed. Indents are positioned to cause the vapor to follow a spiral path, adding to the efficiency of the unit. Approximately three theoretical plates at 60mL/hr. Hold up to 1.2mL operating, 0.5mL static. Receiver capacity is 15mL. Three-way stopcocks achieve manifold arrangement making it possible to remove receivers without disturbing the euilibrium. 10/30 thermometer joints for 25mm immersion thermometers.