Characteristics of NAEM salt-catalyzed alcohol organosolv pulping as a biorefinery

Yawalata, Dominggus; Paszner, L.

doi:10.1515/hf.2006.039

Cited by 10 publications

(6 citation statements)

References 15 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Alternatively, pretreatment under alkaline conditions, such as ammonia fiber explosion and lime pretreatment, results in extensive delignification while preserving a greater amount of hemicellulose in the solid fraction, which may require the addition of hemicellulosic enzymes [4,18]. Moreover, it may also be advantageous to consider the use of neutral alkaline earth metal (NAEM) salt catalysts, such as AlCl 2 and MgCl 2 , as previous studies [20,21] have shown that organosolv pulping using MgCl 2 resulted in the partial preservation of hemicellulose in the solid fraction and comparable delignification when compared to the use of an acid catalyst such as H 2 SO 4 . Although studies with alternative catalysts have focused mostly on the optimization of pulps for papermaking, they may also be useful for creating substrates with varying characteristics and in limiting the formation of sugar degradation products such as furfurals and organic acids [22].…”

mentioning

confidence: 99%

The Effect of Varying Organosolv Pretreatment Chemicals on the Physicochemical Properties and Cellulolytic Hydrolysis of Mountain Pine Beetle-Killed Lodgepole Pine

Rio

Chandra

Saddler

2009

Appl Biochem Biotechnol

View full text Add to dashboard Cite

Mountain pine beetle-killed lodgepole pine (Pinus contorta) chips were pretreated using the organosolv process, and their ease of subsequent enzymatic hydrolysis was assessed. The effect of varying pretreatment chemicals and solvents on the substrate's physicochemical characteristics was also investigated. The chemicals employed were MgCl2, H2SO4, SO2, and NaOH, and the solvents were ethanol and butanol. It was apparent that the different pretreatments resulted in variations in both the chemical composition of the solid and liquid fractions as well in the extent of cellulolytic hydrolysis (ranging from 21% to 82% hydrolysis after 12 h). Pretreatment under acidic conditions resulted in substrates that were readily hydrolyzed despite the apparent contradiction that pretreatment under alkaline conditions resulted in increased delignification (approximately 7% and 10% residual lignin for alkaline conditions versus 17% to 19% for acidic conditions). Acidic pretreatments also resulted in lower cellulose degree of polymerization, shorter fiber lengths, and increased substrate porosity. The substrates generated when butanol/water mixtures were used as the pretreatment solvent were also hydrolyzed more readily than those generated with ethanol/water. This was likely due to the limited miscibility of the solvents resulting in an increased concentration of pretreatment chemicals in the aqueous layer and thus a higher pretreatment severity.

show abstract

mentioning

confidence: 99%

The Effect of Varying Organosolv Pretreatment Chemicals on the Physicochemical Properties and Cellulolytic Hydrolysis of Mountain Pine Beetle-Killed Lodgepole Pine

Rio

Chandra

Saddler

2009

Appl Biochem Biotechnol

View full text Add to dashboard Cite

show abstract

“…Here, aggressive catalyst acids at high concentrations (see Supplementary Information Tab. S2) probably hydrolyze and/or degrade sugars as has been observed for spruce, which was extensively disintegrated after organosolv pretreatment [49]. Nevertheless, it seems that for most experimental conditions, glucose (i.e., cellulose) stays in the recovered fraction.…”

Section: Analysis Of Recovered Materialsmentioning

confidence: 80%

Acetosolv pretreatment of wood for biorefinery applications

Marks

Viell

2021

Biomass Conv. Bioref.

View full text Add to dashboard Cite

The production of biofuels and biochemicals requires a pretreatment to cleave the composite-like structure of lignocellulosic biomass and thus facilitate further conversion. In the case of liquid-based pretreatment, it is important to know which pretreatment liquids allow for an effective conversion of biomass. For the development of effective pretreatment strategies, simple criteria for a fast evaluation of pretreatment results are advantageous. In this study, we use the example of acetosolv pretreatment of beech wood to explore the influence of composition of the employed acetosolv liquids. To this end, we investigate pretreatment phenomena on different scales including macroscopic disintegration, overall mass balances and compositional changes of beech wood. We relate the investigated phenomena with the type and amount of catalyst acid as well as water content of the employed acetosolv liquids. The results show that disintegration increases with both a higher concentration and acidity of the catalyst acid, while excessive disintegration can be balanced by an increased water content up to equimolar ratios of water and acetic acid. Furthermore, an increasing disintegration correlates with an increasing non-recovered fraction up to a maximum of 40 wt%. The non-recovered fraction in turn linearly depends on the amount of removed hemicellulose and lignin. Overall, a low lignin content together with complete disintegration after pretreatment in acetosolv liquids with a high water content allows for increased sugar yields in subsequent enzymatic hydrolysis. Thus, disintegration and non-recovered fraction serve as a simple indicator for a first assessment of pretreatment effectiveness.

show abstract

“…So, the amount of lignin removal after alkaline pretreatment was more than that after treatment with acidic and neutral sulfite. During the ethanol sulfite pretreatment, the surface tension reduced because of the addition of ethanol, which was a benefit of solution penetration and lignin sulfonation, resulting in more lignin removal [17-19]. Moreover, the boiling point of ethanol is lower than that of water; hence, the pressure in the ethanol sulfite pretreated bottle was the highest.…”

Section: Resultsmentioning

confidence: 99%

Comparative study of sulfite pretreatments for robust enzymatic saccharification of corn cob residue

Xing

et al. 2012

Biotechnol Biofuels

View full text Add to dashboard Cite

BackgroundCorn cob residue (CCR) is a kind of waste lignocellulosic material with enormous potential for bioethanol production. The moderated sulphite processes were used to enhance the hydrophily of the material by sulfonation and hydrolysis. The composition, FT-IR spectra, and conductometric titrations of the pretreated materials were measured to characterize variations of the CCR in different sulfite pretreated environments. And the objective of this study is to compare the saccharification rate and yield of the samples caused by these variations.ResultsIt was found that the lignin in the CCR (43.2%) had reduced to 37.8%, 38.0%, 35.9%, and 35.5% after the sulfite pretreatment in neutral, acidic, alkaline, and ethanol environments, respectively. The sulfite pretreatments enhanced the glucose yield of the CCR. Moreover, the ethanol sulfite sample had the highest glucose yield (81.2%, based on the cellulose in the treated sample) among the saccharification samples, which was over 10% higher than that of the raw material (70.6%). More sulfonic groups and weak acid groups were produced during the sulfite pretreatments. Meanwhile, the ethanol sulfite treated sample had the highest sulfonic group (0.103 mmol/g) and weak acid groups (1.85 mmol/g) in all sulfite treated samples. In FT-IR spectra, the variation of bands at 1168 and 1190 cm-1 confirmed lignin sulfonation during sulfite pretreatment. The disappearance of the band at 1458 cm-1 implied the methoxyl on lignin had been removed during the sulfite pretreatments.ConclusionsIt can be concluded that the lignin in the CCR can be degraded and sulfonated during the sulfite pretreatments. The pretreatments improve the hydrophility of the samples because of the increase in sulfonic group and weak acid groups, which enhances the glucose yield of the material. The ethanol sulfite pretreatment is the best method for lignin removal and with the highest glucose yield.

show abstract

Characteristics of NAEM salt-catalyzed alcohol organosolv pulping as a biorefinery

Cited by 10 publications

References 15 publications

The Effect of Varying Organosolv Pretreatment Chemicals on the Physicochemical Properties and Cellulolytic Hydrolysis of Mountain Pine Beetle-Killed Lodgepole Pine

The Effect of Varying Organosolv Pretreatment Chemicals on the Physicochemical Properties and Cellulolytic Hydrolysis of Mountain Pine Beetle-Killed Lodgepole Pine

Acetosolv pretreatment of wood for biorefinery applications

Comparative study of sulfite pretreatments for robust enzymatic saccharification of corn cob residue

Contact Info

Product

Resources

About