Abstract
The Krafft temperature of three anionic surfactants, that is, sodium lauryl sulfate (NaLS), potassium lauryl sulfate (KLS), and calcium lauryl sulfate (CaLS), have been determined in the presence of foam boosters such as lauric diethanolamide (LDEA), cocoamidopropylbetaine (CAPB), monoethoxylated cocomonoethanolamide (CMEA(EO)1), and cocomonoethanolamide (CMEA). The Krafft temperatures were depressed with the increase in the concentration of the foam boosters. The decrease in Krafft temperature was greater for the surfactant with bivalent counterions compared to the surfactant with monovalent counterions. CAPB was found to be the most efficient among the foam boosters in reducing the Krafft temperature of the surfactants studied.
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