کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
638768 | 1456178 | 2007 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The use of membrane-assisted precipitation for the concentration of xanthan gum
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Combining ultrafiltration and precipitation was studied to improve the productivity of xanthan separation. Changes in solution properties and the association behavior of xanthan were modified by salt (KCl) and solvent (isopropanol) addition, and were assessed using scanning electron microscopy (SEM). The concentration polarization layer produced by xanthan dissolved in buffer solution had a very high specific flux resistance that was enhanced by the addition of either KCl or isopropanol. SEM analysis revealed that the fine macromolecular structure observed with xanthan in buffer was further stabilized in the presence of KCl. Isopropanol addition induced phase separation and the formation of closely packed soft aggregate particles that significantly increased fouling layer specific resistance. The simultaneous salt and organic solvent addition resulted in surface morphologies containing aggregates that associated to create gels with varying porosities. When at least 1% (w/v) KCl and >30% (v/v) isopropyl alcohol was added to 2.5% (w/v) xanthan solution, a very porous fouling layer was created, which dramatically increased membrane flux. Membrane-assisted precipitation reduced the amount of precipitating solutes used while greatly increasing membrane flux, resulting in a large improvement in separation productivity.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 294, Issues 1â2, 15 May 2007, Pages 84-92
Journal: Journal of Membrane Science - Volume 294, Issues 1â2, 15 May 2007, Pages 84-92
نویسندگان
Beatriz Torrestiana-Sanchez, Laura Balderas-Luna, Edmundo Brito-De la Fuente, Robert W. Lencki,