Abstract :
Lauril amide is one of nonionic surfactant and has potency to become an ecofriendly
surfactant. The main problem on lauril amide synthesis is the low conversion of lauric acid.
Optimation of lauril amide synthesis was done with three variabels which give influence. One
stage amidation was done by reacting lauric acid with diethanolamine using catalyst
Novozyme 435® with substrate ratio lauric acid:diethanolamine 1:1, 2:1, 3:1, 4:1,5:1, amount
of catalyst 1,8, 4, 7, 10, 11,8% from lauric acid total amount, solvent ratio 0, 1:1, 2:1, 3:1, 4:1
from lauric acid total amount and reacted for 24 hours with temperature reaction 55oC and
500 rpm. Product separated from catalyst using filtration method and then purified by wash
with acetone and heated with temperature 90oC to remove solvent. Product has been analyzed
with acid value to obtained percent conversion of lauril amide, determine of Hydrophilic
Liphophilic Balance value, spectroscopy Fourier Transform Infrared (FT-IR) and determine
of critical micelle concentrasion. Percent conversion optimum has obtained 86,16% at
condition substrate ratio 1:1, enzyme concentration Novozyme 435® 7% and solvent ratio
2:1. From analyze result of lauril amide surfactant, HLB value has obtained 11,93, this
showed that lauril amide surfactant can use as emultion oil in water.