A mixture of amines is formed according to the following reactions.
CH3CH2CH2OH + NH3 CH3CH2CH2NH2 + H2O
propylamine
The propylamine formed can further react with propanol to give dipropylamine
CH3CH2CH2OH + CH3CH2CH2NH2 (CH3CH2CH2)2NH2 + H2O
dipropylamine
Dipropylamine can further react to give tripropylamine
CH3CH2CH2OH + (CH3CH2CH2)2NH2 (CH3CH2CH2)3NH2 + H2O
tripropylamine