Search Result of "Ubolrat Weerawatsophon"

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Optimum Conditions for Selective Separation of Kraft Lignin

ผู้แต่ง:ImgPawadee Methacanon, ImgUbolrat Weerawatsophon, ImgMonnapat Thainthongdee, ImgMrs.Porntip Lekpittaya, Assistant Professor,





Preparation of Kraft Lignin and Their Application in Natural Rubber Composites

ผู้แต่ง:ImgMrs.Porntip Lekpittaya, Assistant Professor, ImgMonnapat Thainthongdee, ImgPawadee Methacanon, ImgUbolrat Weerawatsophon,




ที่มา:วิทยาสารเกษตรศาสตร์ สาขา วิทยาศาสตร์

หัวเรื่อง:ไม่มีชื่อไทย (ชื่ออังกฤษ : Optimum Conditions for Selective Separation of Kraft Lignin)

ผู้เขียน:ImgPawadee Methacanon, ImgUbolrat Weerawatsophon, ImgMonnapat Thainthongdee, Imgนางพรทิพย์ เล็กพิทยา, ผู้ช่วยศาสตราจารย์



Lignin has been investigated over the last few decades as a promising natural alternative to phenolic resin (phenol-formaldehyde), due to their structural similarity. In the present work, lignin was precipitated from the Kraft black liquor of Eucalyptus camaldulensis Dehn. at pH 2, 4 and 6, respectively in order to determine the optimal separation conditions. A comparison study was performed among the lignin samples obtained, based on yield, average molecular weight, chemical structure and thermal stability. The results showed that the best conditions occurred with lignin precipitation at pH 4. For low molecular weight (MW) lignin, each selective extraction was carried out using dichloromethane, acetone and methanol to study the effects of the lignin to solvent ratio, and extraction time on the lignin yield. Physico-chemical characterization of the low MW lignin was also carried out to evaluate the most suitable lignin for adhesive purposes. The results showed a ratio of 1:5 (lignin:solvent) and an extraction time of 1 h were sufficient for extraction. Dichloromethane-soluble lignin with a molecular weight of approximately 940 g mol-1 would be best for the adhesive formulation in future work.

Article Info
Agriculture and Natural Resources -- formerly Kasetsart Journal (Natural Science), Volume 044, Issue 4, Jul 10 - Aug 10, Page 680 - 690 |  PDF |  Page 



นาง พรทิพย์ เล็กพิทยา, ผู้ช่วยศาสตราจารย์

ที่ทำงาน:ภาควิชาวิศวกรรมวัสดุ คณะวิศวกรรมศาสตร์ บางเขน

สาขาที่สนใจ:Polymer composite, Lignin extraction from agricultural product, Conductive polymer, Surface modification using admicellar polymerization technique