Abstract
ABSTRACTA series of bi‐component nonylphenol alkyl sulphonate surfactants with different alkyl chains (C12/n‐NPAS, n = 8, 10, 14, 16) were synthesized through sulphonation‐alkylation‐neutralization, using a mixture of linear alpha olefins as raw materials. The chemical structures were characterized by FTIR and ESI‐MS. The purity values measured by the two‐phase titration method were all higher than 0.96 g/g (96 wt%). The effects of the raw materials composition on salinity tolerance, adsorption, and emulsification properties were also investigated. There is marked adsorption amount variation for bi‐component surfactants with a strong difference of carbon number of alkyl groups. The salinity tolerance of C12/n‐NPAS is about 40 g · L−1 of NaCl, and 0.65 g · L−1 of CaCl2. Compared with petroleum sulphonates (14 g · L−1 of NaCl, 0.08 g · L−1 of CaCl2) and LAS (22 g · L−1 of NaCl, 0.37 g · L−1 of CaCl2), NPAS surfactants show a low adsorption, excellent salinity tolerance, and emulsion stability.
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