Organosolv pulping of wheat straw by use of acetone-water mixtures

Dissolving pulp from corn stalk residue and waste water of Merox unit

“…The 62.9% holocellulose content of the corn stalk is less than that reported for cotton stalk, wheat straw, sugar cane bagasse, and hemp (65-70%) [3,10,[21][22][23]. The 20.5% lignin content is more than the lignin content in kenaf, rice straw, barley straw, and sorghum straw (12-14%) [5], and wheat straw, and hemp (17-19%) [23], is comparable to that of sugar cane bagasse (18-22%) [10,21], and is less than cotton stalk and wood-based materials (20-30%) [5,22].…”

“…The non-wood plants offer several interesting advantages, such as requiring moderate irrigation and fertilization during short growth cycle of plant, reducing energy and chemicals use during pulping due to low lignin content, saving wood raw materials for other uses and preventing massive deforestation, reducing cellulose fiber export, and producing pulp with environmentally friendly technology using non-wood fibers [1][2][3][4][5].…”

“…Basically, it functions as a pulping catalyst and thus speeds up delignification. If high alphacellulose contents and low lignin and acetone-alcohol extractable contents are desired, a high operation temperature (150-170 • C) and an intermediate-to-long cooking time (95-100 min) must be used [3]. During the Kraft pulping process, about 90% of the lignin is removed; the remaining 10% is removed by a subsequent bleaching treatment with chlorine-based chemicals, since this has no adverse effect on the cellulose fiber quality.…”

Properties of Rice Stem Extracts Obtained by Using Subcritical Fluids

“…8) It has been reported that the lignocellulosic materials submitted to a subcritical organic solvent produced a black liquor which had radical scavenging ability. [9][10][11] Chiou et al have reported that subcritical aqueous ethanol and acetone were effective for extracting carbohydrates and phenolic compounds from rice bran. 12) We therefore investigated the effects of the ethanol or acetone content in the extractant on the carbohydrate and phenolic contents of a rice stem extract.…”

Selective Acetone-Water Delignification of Eucalyptus urograndis: An Alternative Towards the Biorefinery Approach

“…In contrast, Pazner and Behera have shown that the extraction of lignin during an organosolv (methanol-water mixture) process occurs from secondary wall and middle lamellae, from the beginning of the process at approximately the same rate [29]. Acetone-water is a very good solvent for lignins, as shown by da Silva Perez et al [11], Balogh et al [30], Jimenez et al [31], Araque et al [32]. Therefore, great selectivity is expected to occur even from the beginning of the extraction process.…”