This thesis work aims the ionic liquid pretreatment of peanut shells for co-production of
glucose as fermentable sugar and lignin, considering a multi product perspective. The
effects of ionic liquid type and pretreatment time period on the sugar and lignin yields
were investigated, as the particle size and temperature parameters were determined in the
preliminary studies. Peanut shells were pretreated at constant temperature, 150 oC, for 5,
15 and 30 minutes with 1-ethyl-3-methylimidazolium acetate and for 15, 30 and 60
minutes with 1-ethyl-3-methylimidazolium chloride. The pretreated peanut shells were
then subjected to enzymatic hydrolysis in order to produce fermentable sugars, mostly,
glucose. The solid residue obtained upon enzymatic hydrolysis was analyzed in terms of
lignin quantity. 1-ethyl-3-methylimidazolium acetate pretreatment for 15 minutes resulted
in the maximum reducing sugar and lignin yields / 28 g of reducing sugar and 20 g of solid
residue with 70% lignin were obtained per 100 g of peanut shells. Higher pretreatment
time resulted in lower yields. Moreover, no optimal time period for 1-ethyl-3-
methylimidazolium chloride pretreatment was obtained, since reducing sugar and lignin
yields increased as the time period increased. Also all reducing sugar and lignin yields
were lower than that obtained with 1-ethyl-3-methylimidazolium acetate. Lignin obtained
upon enzymatic hydrolysis of 1-ethyl-3-methylimidazolium acetate pretreated peanut
shells were characterized by SEM, FTIR, TGA and XRD analyses, which also showed the
morphological and structural effects of pretreatment and enzymatic hydrolysis on peanut
shells / and used as concrete admixture, which increased the flow of the concrete by 6%.
| Identifer | oai:union.ndltd.org:METU/oai:etd.lib.metu.edu.tr:http://etd.lib.metu.edu.tr/upload/12615535/index.pdf |
| Date | 01 February 2013 |
| Creators | Tatli, Emre |
| Contributors | Bolukbasi, Ufuk |
| Publisher | METU |
| Source Sets | Middle East Technical Univ. |
| Language | English |
| Detected Language | English |
| Type | M.S. Thesis |
| Format | text/pdf |
| Rights | Access forbidden for 1 year |
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