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- W2808205544 endingPage "2980" @default.
- W2808205544 startingPage "2967" @default.
- W2808205544 abstract "Lignosulfonate is a byproduct of the sulfite pulping process and has limited use in industry. The main objective of this study was to investigate the carboxyethylation of lignosulfonate to increase its charge density to broaden its applications. The carboxyethylation of lignosulfonate was optimized under the conditions of 30 wt % NaOH, 2.0 mol mol-1 2-chloropropinic acid/lignosulfonate, 90 °C, 0.5 h, and 0.03 mol 2-chloropropinic acid, which produced carboxyethylated lignosulfonate with a charge density and molecular weight of -3.51 meq g-1 and 46 493 g mol-1 , respectively. The mechanism of the carboxyethylation reaction using 2-chloropropinic acid by an SN 1 pathway in an alkaline solution was discussed. Methylation was also used to mask the phenolic hydroxide groups of lignosulfonate to investigate if carboxyethylation occurred on aliphatic hydroxide groups of lignosulfonate. The produced carboxyethylated lignosulfonate was characterized by using FTIR spectroscopy, NMR spectroscopy, gel permeation chromatography, and elemental and functional group analyses. Basic 1 H-1 H 2 D COSY NMR spectroscopy was used to record the coupled spins of the carboxyethyl group on carboxyethylated lignosulfonate. The information from 1 D 1 H NMR and 2 D NMR COSY spectroscopy provided evidence for the existence of a 1-carboxyethyl group on the carboxyethylated lignosulfonate structure." @default.
- W2808205544 created "2018-06-21" @default.
- W2808205544 creator A5015700325 @default.
- W2808205544 creator A5047985992 @default.
- W2808205544 date "2018-07-18" @default.
- W2808205544 modified "2023-09-24" @default.
- W2808205544 title "Synthesis and Characterization of Carboxyethylated Lignosulfonate" @default.
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