| dc.description.abstract | Sodium dodecyl sulfate (SDS) was highly water soluble compound and was one of the commonly used surfactants. In previous studies, hydrate forms of SDS, 1/8 hydrate, hemihydrate, monohydrate, and anhydrous had been reported. However, there are few studies mentioned how to control the hydrate forms for SDS in the manufacturing process. Therefore, the aim of this thesis was to produce exact SDS·1/8 hydrate, through the combined process of evaporative, anti-solvent, cooling crystallization, and co-solvent system in batch system. First, purchased SDS crystals were immersed into the 1:17 volume ratio of co-solvent composed of water to acetone (v/v)) for preparation of SDS·1/8 hydrate. In combined process, 255mL of acetone was chosen as anit-solvent to introduce into crystallizer. Finally, produced SDS·1/8 hydrate was tested stability by exploring at 25, 52 and 75% relative humidity. The yield for the combined crystallization process was about 83%. The produced SDS was speculated to be SDS·1/8 hydrate, by characterization of Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and powder X-ray diffraction (PXRD). The result of stability test demonstrated that the produced SDS·1/8 hydrate was a stable form. | en_US |