Octadecylmethyldihydroxyethyl ammonium bromide (OMDAB)was synthesized withN-methyldiethanolamine and octadecylbromide as raw materials under microwave condition.It was analyzed quantitatively with two-phase titration and characterized with IR
1H NMR and elemental analysis.The effects of solvent
microwave power
reaction time
and solvent volume on the conversion rate were studied.The optimal condition obtained through response surface methodology (RSM)is as follows: with hexanol as solvent
solvent volume of 10.7 ml
reaction time of 25 min
and microwave power of 570 W.Under the optimal condition
in a very short reaction time
just 4.63% of the conventional heating time
the conversion can reach 95.30%.The surface tension
Krafft point
CMC and the melting point of the product are determined.