在文獻回顧中，蒸發結晶、反溶劑結晶以及冷卻結晶法為分離及純化常見之技術，但多為各別探討，較少文獻針對此三種結晶製程合併及放大規模的討論。因此，本研究的目的是發展對於高溶解度分子：十二烷基硫酸鈉（SDS）具有再現性之結晶製備程序，由冷卻結晶、蒸發結晶以及反溶劑結晶法共同組成，並預期能達到理想的產品性質，如產量、顆粒尺寸分佈（PSD）和純度。此合併結晶製程的產率為80.2％至90.2％，其中母液從25℃冷卻至5℃，藉由加入晶種及將丙酮以先慢後快的方式加入的應用，確實可以將PSD改善，其中晶體之平均尺寸為125至177 μm。所產出的晶體皆經過偏振光學顯微鏡（POM）、傅里葉變換紅外光譜（FTIR）、粉末X射線衍射（PXRD）和熱重分析（TGA）完整的鑑定。根據FTIR、PXRD和TGA之檢測結果，產出的SDS與購買的SDS相同。此外，我們也將文獻中提供的SDS-H2O相圖及在蒸發過程中的SDS溶液組成變化進行了相關的研究及比對。;Evaporative, anti-solvent and cooling crystallization are common techniques used in purification and separation, and have been well-studied individually in the literatures. However, there is a few study related to the combination and scaling-up of those three crystallization processes. Therefore, the aim of this research is to develop a reproducible production of a highly water soluble compound: sodium doedecyl sulfate (SDS) through the combined process of evaporative, anti-solvent and cooling crystallization systematically with the desired product attributes such as yield, particle size distribution (PSD) and purity. The yield for the combined crystallization process was 80.2% to 90.2%, where the mother liquor was cooled from 25℃ to 5℃. PSD could indeed be narrowed by applying seeding strategy accompanying with cubic addition of acetone in the combined crystallization process, the mean crystal size was 125 to 177 μm. The produced crystals were also characterized by polarized optical microscopy (POM), Fourier-transform infrared spectroscopy (FTIR), powder X-ray diffraction (PXRD) and thermogravimetric analysis (TGA). Based on the results of FTIR, PXRD and TGA, the produced SDS was identical with the purchased SDS. In addition, the variation of composition during evaporation process was investigated experimentally by the SDS-H2O phase diagram provided in the literature.
