Method for preparing glutamate-based surfactant

A method for preparing a glutamate-based surfactant, the method comprising:

• a) subjecting a triglyceride derivative to a chlorination addition reaction;
• b) reacting a product from a) with a glutamic acid salt to prepare a reaction mixture;
• c) adding an acid aqueous solution to the reaction mixture from b) to separate layers;
• and
• d) purifying an organic layer separated from c) with a 4 wt % or more inorganic salt aqueous solution to prepare the glutamate-based surfactant.