Open AccessA Novel Hydrate Form of Sodium Dodecyl Sulfate and Its Crystallization Process
Author(s) -
Hung Lin Lee,
Yun Sheng Cheng,
Ken Yeh,
Tu Lee
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c01147
Subject(s) - hydrate , sodium dodecyl sulfate , aqueous solution , thermogravimetric analysis , chemistry , fourier transform infrared spectroscopy , acetone , crystallization , acetonitrile , powder diffraction , mother liquor , inorganic chemistry , nuclear chemistry , organic chemistry , chemical engineering , crystallography , engineering
A novel hydrate form of sodium dodecyl sulfate (SDS) was firstly discovered through a hydrate screening with the use of organic solvents, while SDS is generally prepared solely in aqueous media. Surprisingly, a novel SDS hydrate form with needle-shaped crystals produced by adding acetonitrile to a 20 wt % SDS aqueous solution at a ratio of 3:1 (v/v) and further cooling to around 5 °C could be found with a trace amount in one of the two purchased SDS products that we examined. After comprehensive solid-state characterizations by powder X-ray diffraction (PXRD), thermogravimetric analysis (TGA), Fourier transform infrared (FTIR), Raman spectroscopy, dynamic vapor sorption (DVS), and elemental analysis (EA), it is also successfully made directly from the synthesis of SDS through esterification and saponification. Four times the equal proportion of acetone was added into the reaction solution at an interval of 5 min to separate the side product, sodium sulfate, from the mother liquor. The desired novel hydrate form of SDS was then obtained by cooling the filtered mother liquor to 5 °C and aged for 8 h for a preferential growth.