A comparison of the autohydrolysis and ammonia fiber explosion (AFEX) pretreatments on the subsequent enzymatic hydrolysis of coastal Bermuda grass

Lee, Jung Myoung; Jameel, Hasan; Venditti, Richard A.

doi:10.1016/j.biortech.2010.02.055

Cited by 88 publications

(36 citation statements)

References 28 publications

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“…This treatment could also open up the cellulose fibers for further reactions and increase the extractability of lignin during the subsequent pulping process (Lavarack et al 2000;Garrote et al 2003). Procedures currently used in pretreatment include hot-water prehydrolysis, wet oxidation (Arvaniti et al 2012), steam pretreatment (Brownell and Saddler 1987), and ammonia fiber explosion (Lee et al 2010). Acetic acid has also been used as a pre-hydrolysis reagent, which is regarded as an environmentally friendly way to obtain cellulose pulps from lignocellulosic materials.…”

Section: Introductionmentioning

confidence: 99%

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Li¹,

Fu²,

Zhou³

et al. 2014

BioResources

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Despite increasing demand for dissolving pulps from raw material, production costs remain quite high compared to regular paper pulp. Research literature to date has focused on improving performance and quality but has not simultaneously explored how to improve yield, which typically falls below 35%. Dissolving pulp from bamboo, as a widely available, high-quality raw material, was investigated with dilute acetic acid pre-hydrolysis before cooking and cold caustic extraction prior to bleaching. It was found that dilute acetic acid in the pre-hydrolysis stage could speed up the degradation of hemicellulose in bamboo and improve the diffusion of the cooking liquor in bamboo fiber compared with hot-water treatment. The dissolving pulp from bamboo was produced with 93% α-cellulose, 90% ISO brightness, 959 mL/g viscosity, 5.23% xylans, and 0.17% ash. The overall yield on the basis of raw material was 37%, which was higher than other documented processes using other agents in prehydrolysis.

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Section: Introductionmentioning

confidence: 99%

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Li¹,

Fu²,

Zhou³

et al. 2014

BioResources

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“…In the ammonia explosion technique, biomass is treated with high-pressure liquid ammonia at a temperature ranging from 90 to 1008C for a 5 min residence time and then the pressure is explosively released. However, ammonia explosion is a more expensive process than steam explosion (Lee et al 2010).…”

Section: Cellulose Treatment By Scco 2 Explosionmentioning

confidence: 99%

“…These treatments are intended either to disrupt the crystalline structure of cellulose or to increase the exposure of the substrate to the hydrolytic enzymes increasing the yield. Among these treatments, 'steam explosion' and 'ammonia explosion' have been proposed as pre-treatments prior to cellulose hydrolysis (Holtzapple et al 1991, Dottori and Benech 2010, Lee et al 2010, Zhenyu Du 2010. During steam explosion, lignocellulosic feed is exposed to highpressure steam to let water molecules penetrate the substrate structure.…”

Section: Cellulose Treatment By Scco 2 Explosionmentioning

confidence: 99%

Cellulosic materials as biopolymers and supercritical CO₂as a green process: chemistry and applications

Medina-González

Camy

Condoret

2012

International Journal of Sustainable Engineering

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. This is an author-deposited version published in : http://oatao. In this review, we describe the use of supercritical CO 2 (scCO 2 ) in several cellulose applications. The focus is on different technologies that either exist or are expected to emerge in the near future. The applications are wide from the extraction of hazardous wastes to the cleaning and reuse of paper or production of glucose. To put this topic in context, cellulose chemistry and its interactions with scCO 2 are described. The aim of this study was to discuss the new emerging technologies and trends concerning cellulosic materials processed in scCO 2 such as cellulose drying to obtain aerogels, foams and other microporous materials, impregnation of cellulose, extraction of highly valuable compounds from plants and metallic residues from treated wood. Especially, in the bio-fuel production field, we address the pre-treatment of cellulose in scCO 2 to improve fermentation to ethanol by cellulase enzymes. Other reactions of cellulosic materials such as organic inorganic composites fabrication and de-polymerisation have been considered. Cellulose treatment by scCO 2 has been discussed as well. Finally, other applications like deacidification of paper and cellulosic membranes fabrication in scCO 2 have been reviewed. Examples of the discussed technologies are included as well.

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“…However, hyperwashing after autohydrolysis removed a similar amount of ink to hyperwashing alone, which indicated that the flexo ink, after high-temperature treatment, was still detachable. Autohydrolysis Autohydrolysis pretreatment is a hydrothermal process that treats lignocellulosic materials under a high-pressure steam at a temperature range of 130 to 260 °C for several seconds to hours (Lee et al 2010b). Optimal hemicellulose solubilization and hydrolysis can be achieved by either high temperature and short retention time or lower temperature and longer retention time.…”

Section: Effect Of Ink and Surfactant On Enzymatic Hydrolysismentioning

confidence: 99%

Enzymatic Hydrolysis of Pretreated Newspaper Having High Lignin Content for Bioethanol Production

et al. 2015

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Recovered papers are suitable biomass sources for conversion into sugars that can be used in bioethanol production. However, paper materials with a high lignin content have been found to be recalcitrant to enzymatic hydrolysis. To address this issue, several biomass pretreatment methods were employed to evaluate their efficiency on the conversion of newspaper with high lignin content to sugar. Autohydrolysis, a hot water treatment, was identified to adversely affect sugar conversion, presumably as a result of pore collapse under high-temperature pretreatment. Flexo ink, used in newspaper printing, had no effect on the enzymatic hydrolysis, with or without autohydrolysis. The ink was still detachable after autohydrolysis, as measured by hyperwashing. Compared to untreated newspaper, separate treatments of either mechanical refining or a non-ionic surfactant (sorbitan polyoxyethylene monooleate) improved the sugar conversion by 10% at enzyme dosages of 2 and 8 FPU/g substrate. The combination of both refining and surfactant resulted in the highest sugar conversions, i.e., 46.3%, 56.7%, and 64.1% at 2, 4, and 8 FPU/g enzyme dosages, respectively. Oxidative pretreatment (oxygen, 100 °C) marginally increased the sugar conversion, whereas alkaline and green liquor (NaCO3 and Na2S) pretreatments (at 160 °C) had either no effect or decreased the sugar conversion. Based on the results of the pretreatments, higher pretreatment temperatures of newsprint negatively impacted subsequent enzyme hydrolysis.

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A comparison of the autohydrolysis and ammonia fiber explosion (AFEX) pretreatments on the subsequent enzymatic hydrolysis of coastal Bermuda grass

Cited by 88 publications

References 28 publications

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Cellulosic materials as biopolymers and supercritical CO₂as a green process: chemistry and applications

Enzymatic Hydrolysis of Pretreated Newspaper Having High Lignin Content for Bioethanol Production

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A comparison of the autohydrolysis and ammonia fiber explosion (AFEX) pretreatments on the subsequent enzymatic hydrolysis of coastal Bermuda grass

Cited by 88 publications

References 28 publications

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Improved Cellulose Yield in the Production of Dissolving Pulp from Bamboo Using Acetic Acid in Prehydrolysis

Cellulosic materials as biopolymers and supercritical CO2as a green process: chemistry and applications

Enzymatic Hydrolysis of Pretreated Newspaper Having High Lignin Content for Bioethanol Production

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Cellulosic materials as biopolymers and supercritical CO₂as a green process: chemistry and applications