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On-line solvent evaporator for coupled LC systems

✍ Scribed by Grob, Konrad ;Tönz, Barbara

Publisher
John Wiley and Sons
Year
1992
Tongue
English
Weight
780 KB
Volume
15
Category
Article
ISSN
0935-6304

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✦ Synopsis

Abstract

The mobile phase of a fraction eluted from a first LC column is removed by an on‐line evaporator in order to reconcentrate the solute material or to exchange the eluent before performing a subsequent LC separation. Evaporation essentially occurs by concurrent evaporation, i.e. the solvent evaporates at a rate equal to the flow rate of the incoming eluent, and is driven by the overflow principle, i.e. vapors leave the tube as a result of the expansion resulting from evaporation.

The liquid is introduced into a small tube (e.g., 4 cm × 1.3 mm i.d.) which is packed, e.g., with a coarse silica gel. The outlet of the evaporator is connected to vacuum in order to enable evaporation at reduced temperature and to increase retention of the volatile components. With normal phase eluents, evaporation rates may approach 1 ml/min; n‐dodecane was the most volatile n‐alkane fully retained by the evaporator.

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