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 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.
Sun
Xiao-Feng
XF
College of Forestry, The North-Western Sciences and Technology University of Agriculture and Forestry, Yangling, People's Republic of China.
Sun
RunCang
R
Sun
Jing-Xia
JX
D015761:4-Aminopyridine / Q000031:analogs & derivatives* / Q000494:pharmacology; D000042:Absorption; D000089:Acetic Anhydrides; D000107:Acetylation; D002482:Cellulose / Q000737:chemistry / Q000378:metabolism*; D007700:Kinetics; D008031:Lignin / Q000737:chemistry / Q000378:metabolism*; D012275:Oryza; D010578:Petroleum / Q000032:analysis / Q000378:metabolism*; D012997:Solvents; D013696:Temperature; D013997:Time Factors; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*
D000089:Acetic Anhydrides; D010578:Petroleum; D012997:Solvents; D014874:Water Pollutants, Chemical; C036909:lignocellulose; C031800:acetic anhydride; D002482:Cellulose; D008031:Lignin; D015761:4-Aminopyridine; C003885:4-dimethylaminopyridine