Efficient Acetylation of Xylans by Exploiting the Potassium Acetate Formed During the Alkaline Extraction

Date

2018-08-01

Author

AKKUS, Merve
Özkan, Necati
BAKIR, Ufuk

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

211
views

0
downloads

Isolation of hemicelluloses through alkaline extraction results in formation of salts, which usually necessitates additional salt removal steps. In this study, acetylation of xylans was studied without the removal of potassium acetate (KAc), a commonly produced salt during the alkaline extraction, to find a facile method to alter the hydrophilic characteristics of hemicelluloses. The acetylation reaction was carried out solely with acetic anhydride without any catalysts or solvents added. The weight gain and ATR-FTIR analyses verified the acetylation of xylans in the presence of KAc. A significant decrease in water solubility and moisture uptake was observed upon acetylation in the presence of KAc which is also accompanied by an increase in thermal stability, disclosing an easy, efficient and environmentally friendly method to obtain hydrophobically modified xylans without the use of toxic catalysts and costly salt purification steps.

Subject Keywords

Lignocellulosic biomass, Hemicellulose, Potassium acetate, Acetylation, Hydrophobic modification

URI

https://hdl.handle.net/11511/30702

Journal

JOURNAL OF POLYMERS AND THE ENVIRONMENT

DOI

https://doi.org/10.1007/s10924-018-1221-8

Collections

Graduate School of Natural and Applied Sciences, Article

Suggestions

OpenMETU
Core

Efficient synthesis of 1-alkoxycarbonyl-methyl-2-alkylpyrroles from dichloro- and methoxychloropropylalkyl ketones Gadzhili, RA; Nadzhafova, RA; Sesenoglu, O (2002-01-01) The condensation reaction of 2,3-dichloropropyl- and 2-methoxy-3-chloropropyl alkyl ketones with alkyl 2-aminoacetate salts leads to 1-alkoxy-carbonylmethyl-2-alkylpyrroles. These compounds, with various bases, gave 1-carbamoylmethyl-, 1-dialkylaminocarbonylmethyl-, 1-carbazoyl methyl-2-alkylpyrroles and potassium salt of 2-alkyl-pyrrolyl-1-acetic acid.
An unconventional approach for improving the integrity and mechanical properties of xylan type hemicellulose based films Bahcegul, Erinc; Toraman, Hilal E.; Erdemir, Duygu; AKINALAN, Busra; Özkan, Necati; Bakir, Ufuk (2014-01-01) The isolation of xylans from lignocellulosic biomass via alkaline extraction typically involves a neutralization step, which results in salt formation. Usually, these salts are removed from the medium to avoid their presence within the isolated xylans and films made from these polymers. The present work shows that it is not always necessary to do so, since the presence of potassium acetate (KAcO) in the films was found to be beneficial both for the film formation and mechanical properties. While desalted xy...
Efficient rearrangement of epoxides catalyzed by a mixed-valent iron trifluoroacetate [Fe3O(O2CCF3)(6)(H2O)(3)] Erturk, Erkan; Gollu, Mehmet; Demir, Ayhan Sıtkı (Elsevier BV, 2010-03-27) The mixed-valent oxo-centered triiron(III, III, II) trifluoroacetate complex [(Fe2FeO)-Fe-III-O-II(C2CCF3)(6)(H2O)(3)] Was prepared by reacting anhydrous iron(III) chloride with boiling trifluoroaceric acid under nitrogen. The non-hygroscopic and readily available mixed-valent triiron trifluoroacetate complex Was found to be an efficient catalyst for the regioselective rearrangement of epoxides. A number of carbonyl compounds formed via the rearrangement of epoxides could be obtained by a simple filtration ...
Multipurpose acetic acid functionalized carbazole derivatives: Synthesis, electrochemical properties and electrochromic device applications Özdemir Hacıoğlu, Şerife; YİĞİT, DENİZ; Akbey, Tuba E.; UDUM, YASEMİN; GÜLLÜ, MUSTAFA; DEPCİ, TOLGA; Toppare, Levent Kamil (2022-03-01) In this study, synthesis of two multifunctional acetic acid functionalized carbazole bearing monomers; 243,6-bis(2,3-dihydrothieno [3,4-b] [1,4]dioxin-5-yl)-9H-carbazol-9-yl)acetic acid (Ml) and 3,6-dithien-2-yl-9H car bazol-9-ylaceticacid (M2) via Stille cross-coupling reaction was reported. Obtained monomers were electro-chemically polymerized in 0.1 M TBAPF(6)/DCM/ACN (5:95, v:v) solution and characterized in terms of electrochemical, spectroelectrochemical and electrochromic switching behaviors. When po...
Selective oxidation of propylene to propylene oxide using combinatorial methodologies Miyazaki, T; Ozturk, S; Onal, I; Senkan, S (Elsevier BV, 2003-06-30) Direct oxidation of propylene by oxygen to propylene oxide (PO) has been studied through the application of the techniques of combinatorial catalysis. Catalytic materials containing single and binary metal components were prepared by impregnating standard gamma-Al2O3 pellets. In the first stage, 34 single component catalytic materials at three different metal loading levels were prepared and screened for PO activity and selectivity using array channel microreactors and mass spectrometry. Experiments were co...

Citation Formats

M. AKKUS, N. Özkan, and U. BAKIR, “Efficient Acetylation of Xylans by Exploiting the Potassium Acetate Formed During the Alkaline Extraction,” JOURNAL OF POLYMERS AND THE ENVIRONMENT, pp. 3397–3403, 2018, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/30702.