Delignification of sugarcane bagasse using glycerol–water mixtures to produce pulps for saccharification

Abstract

This paper describes the organosolv delignification of depithed bagasse using glycerol-water mixtures without a catalyst. The experiments were performed using two separate experimental designs. In the first experiment, two temperatures (150 and 190°C), two time periods (60 and 240 min) and two glycerol contents (20% and 80%, v/v) were used. In the second experiment, which was a central composite design, the glycerol content was maintained at 80%, and a range of temperatures (141.7-198.3°C) and time (23-277 min) was used. The best result, obtained with a glycerol content of 80%, a reaction time of 150 min and a temperature of 198.3°C, produced pulps with 54.4% pulp yield, 7.75% residual lignin, 81.4% delignification and 13.7% polyose content. The results showed that high contents of glycerol tend to produce pulps with higher delignification and higher polyoses content in relation to the pulps obtained from low glycerol content reactions. In addition, the proposed method shows potential as a pretreatment for cellulose saccharification.

Pretreatment strategies for delignification of sugarcane bagasse: a review

“…This technique presents advantages when compared with aqueous based processes. In particular, the recovery of lignins and polyoses from the liquor is easily performed by distillation with the simultaneous recycling of solvents (Novo et al 2011). Mesa et al (2011) demonstrated that the combination of a dilute-acid pretreatment followed by the organosolv pretreatment with NaOH under optimized conditions (60 min, 195ºC, 30% v/v ethanol) was efficient for the fractionation of sugarcane bagasse for subsequent enzymatic hydrolysis, yielding a residual solid material containing 67.3% (w/w) glucose, which was easily recovered by the enzymatic hydrolysis.…”

“…Mesa et al (2011) demonstrated that the combination of a dilute-acid pretreatment followed by the organosolv pretreatment with NaOH under optimized conditions (60 min, 195ºC, 30% v/v ethanol) was efficient for the fractionation of sugarcane bagasse for subsequent enzymatic hydrolysis, yielding a residual solid material containing 67.3% (w/w) glucose, which was easily recovered by the enzymatic hydrolysis. Novo et al (2011) developed a process using glycerol-water mixtures and obtained a pulp with a residual lignin amount lower than 8%; the delignification was close to 80% and residual cellulose content was higher than 80%.…”

Avaliação das propriedades química, física e mecânica de painéis aglomerados produzidos com resíduo de madeira da Amazônia - Cumaru (Dipteryx Odorata) e resina poliuretana à base de óleo de mamona

“…As análises químicas como teor de extrativos (T204 cm-97), teor de lignina klason (T222 om-02) e teor de cinzas (T211 om-02), foram realizadas no Instituto de Química de São Carlos (IQSC-SP) baseadas na norma TAPPI (Technical Association of the Pulp and Paper Industry). O teor de lignina solúvel foi analisado de acordo com a metodologia [10] e o teor de celulose e polioses foi determinado por análise cromatográfica no Cromatógrafo SHIMADZU, modelo CR 7A, utilizando o filtrado obtido na determinação do teor de lignina klason [11] .…”

Pretreatment of Wastepaper using Aqueous Glycerol to enhance Enzymatic Hydrolysis

“…또한 EG를 사 용하여 경제성을 더욱 높이는 방법으로 여러 번 사용하고 남 은 EG 폐액을 polyester같은 생분해성 고분자 물질을 제조하 는 연구를 발표하였다 [4]. EG와 비슷한 화학적 성질을 가진 glycerol은 최근 섬유질 기질의 전처리에 많이 이용되고 있다 [5][6][7][8][9][10]. 전처리 용매로 사용된 EG에 비해 glycerol의 가장 큰 장점은 낮은 용매 가격 인데 2006년 기준으로 바이오디젤 공정에서 생산된 glycerol 가격이 석유화학공정에서 생산된 EG가격의 절반 이하이다 [11].…”