Acetylation of Rice Straw with or without Catalysts and Its Characterization as a Natural Sorbent in Oil Spill Cleanup

An investigation of the acetylation of rice straw with acetic anhydride at 100 and 120 degrees C for 1-4 h with four tertiary amine catalysts (pyridine, 4-dimethylaminopyridine, N-methylpyrrolidine, and N-methylpyrrolidinone) or without catalyst in a solvent-free system was undertaken, and the exten...

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Bibliographic Details
Published in:Journal of agricultural and food chemistry 2002-10, Vol.50 (22), p.6428-6433
Main Authors: SUN, Xiao-Feng, SUN, Runcang, SUN, Jing-Xia
Format: Article
Language:English
Subjects:
4-Aminopyridine - analogs & derivatives
4-Aminopyridine - pharmacology
Absorption
Acetic Anhydrides
Acetylation
Applied sciences
Biological and medical sciences
Cellulose - chemistry
Cellulose - metabolism
Decontamination. Miscellaneous
Exact sciences and technology
Food industries
Fundamental and applied biological sciences. Psychology
Kinetics
Lignin - chemistry
Lignin - metabolism
Oryza
Petroleum - analysis
Petroleum - metabolism
Pollution
Soil and sediments pollution
Solvents
Temperature
Time Factors
Use and upgrading of agricultural and food by-products. Biotechnology
Water Pollutants, Chemical - analysis
Water Pollutants, Chemical - metabolism
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Summary:An investigation of the acetylation of rice straw with acetic anhydride at 100 and 120 degrees C for 1-4 h with four tertiary amine catalysts (pyridine, 4-dimethylaminopyridine, N-methylpyrrolidine, and N-methylpyrrolidinone) or without catalyst in a solvent-free system was undertaken, and the extent of acetylation was measured by weight percent gain, which increased with the extent of reaction time and temperature and the amounts of catalyst used. 4-Dimethylaminopyridine was found to be the most effective catalyst of those studied. At a concentration of 7% of the catalyst in acetic anhydride, a weight percent gain of 15.4% was realized, compared with 11.2% for the noncatalyst reaction, after 0.5 h of exposure to the system at 120 degrees C. Characterization of acetylated straw was performed by FT-IR, CP MAS (13)C NMR, and thermal studies. Interestingly, the acetylated straw is significantly hydrophobic and does not get wet with water, thereby offering potential for the better utilization of cheap waste materials as natural sorbents in oil cleanup.
ISSN:0021-8561
1520-5118
DOI:10.1021/jf020392o