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|Type:||Artigo de periódico|
|Title:||Piassava fibers. (Attalea funifera) .1. Chemical analysis, extraction and reactivity of its lignin|
|Abstract:||Piassava fibers have approximately 14% humidity and contain 0.8% ash, 0.7% extractives, 45.0% Klason lignin and 28.6% cellulose, with a total of 54.4% holocellulose. Microanalysis (54.5% C; 5.84%; 0.52% N) shows a higher carbon content than normally found in plant materials. Total hydroxyl groups are 14.0% of the material. The content of methoxyl groups (4.8% or 10.7% of the lignin) and phenolic hydroxyl groups (3.5% or 7.8% of the lignin) are in the expected range. The calculated C-9 formula for the lignin is C9H5.35O0.92 (OHphen)(0.72)(OCH3)(0.51). The average molecular weight for the dioxane/HCl extracted lignin is in the range of 3,500 dalton and that for the NaOH lignin is 1,100 dalton, but their FTIR spectra are similar. Using an alkaline (pH 10) dioxane/water (1:1 v:v) mixture and pressure (6 MPa), 46% of the piassava can be solubilized in 15 min at 250 degrees. After 30 min at 280 degrees, 88% of the piassava is converted to give a heavy oil with 56% yield. At 200 degrees and 10 Pa, 71% of this oil can be distilled. The distillate was analyzed by GC/MS and five phenols were identified in good individual yields.|
|Editor:||Editura Academiei Romane|
|Citation:||Cellulose Chemistry And Technology. Editura Academiei Romane, v. 29, n. 6, n. 705, n. 712, 1995.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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