BUCHI Distillation Unit K-355 - Manual (Page 17)

4 Description of function
17 K-350 Operation Manual, Version F
4 .2 Function principle
The Distillation Unit K-50 is suitable for determining nitrogen using the Kjeldahl (TKN; Total Kjeldahl
Nitrogen) and Devarda methods as well as for other distillations of steam-volatile substances (e.g. of
alcohol, SO
2
, volatile acids).
1
2
4
5
a Sample tube
b Splash protector
c Condenser
d Distillate outlet tube
e Receiving vessel with receiver solution
Fig. 4.2: Function principle
Steam is introduced into the sample solution (in sample tube a) to drive out volatile components
(such as ammonia, alcohol, etc.). After condensation (in condenser c) the condensate is collected in
a receiver solution (in receiving vessel e).