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Pretreatment and enzymatic process modification strategies .

Pretreatment and enzymatic process modification strategies .

Pretreatment and enzymatic hydrolysis play a critical role in the economic production of sugars and fuels from lignocellulosic biomass. In this study, we evaluated diverse pilot-scale pretreatments and different post-pretreatment strategies for the production of fermentable sugars from sugarcane bagasse. For the pretreatment of bagasse at pilot-scale level, steam explosion without catalyst and .

Bioconversion of Sugarcane Biomass into Ethanol: An .

Bioconversion of Sugarcane Biomass into Ethanol: An .

Depleted supplies of fossil fuel, regular price hikes of gasoline, and environmental damage have necessitated the search for economic and eco-benign alternative of gasoline. Ethanol is produced from food/feed-based substrates (grains, sugars, and molasses), and its application as an energy source does not seem fit for long term due to the increasing fuel, food, feed, and other needs.

An overview of key pretreatment processes employed for .

An overview of key pretreatment processes employed for .

Sep 05, 2013 · Lime pretreatment of corn stover was studied by Kim and Holtzapple . Corn stover was pretreated with an excess of calcium hydroxide (0.5 g Ca(OH) 2 /g raw biomass) in non-oxidative and oxidative conditions at 55 °C for 4 weeks with aeration. Under these conditions, the total yield of glucose and xylose was 91.3 and 51.8 % at 15 FPU/g cellulose .

A packed bed Ammonia Fiber Expansion reactor system for .

A packed bed Ammonia Fiber Expansion reactor system for .

Chemical pretreatment of corn stover and wheat straw using a laboratory-scale packed bed AFEX reactor system was investigated. The results show that the cycle of presteam, ammonia charge, soak, depressurize and steam strip steps could be repeated with ammonia transfer from bed-to-bed achieved by mechanical recompression of the recovered vapor.

Effect of mechanical disruption on the effectiveness of .

Effect of mechanical disruption on the effectiveness of .

The ZipperClave ® (ZC) and steam gun (SG) are batch reactors in which biomass is pretreated and discharged at the end of pretreatment, whereas the horizontal screw (HS) reactor is a screw-fed, plug flow reactor with continuous biomass feed. Not only is the mode of operation different for each reactor, but the pretreatment mechanism of each .

Biomass Feedstock Pre-Processing – Part 1: Pre-Treatment .

Biomass Feedstock Pre-Processing – Part 1: Pre-Treatment .

Oct 18, 2010 · 3.2.1. Steam explosion. Steam explosion is one of the most applied pre-treatment processes owing to its low use of chemicals and limited energy consumption (Harmsen et al., 2010). During steam explosion pre-treatment process, the lignocellulosic biomass is heated with high pressure saturated steam having temperatures typically in the range of .

Frontiers | Recent Trends in the Pretreatment of .

Frontiers | Recent Trends in the Pretreatment of .

Dec 18, 2018 · Steam explosion was found to be an effective pretreatment technique in enhancing the microbial digestion of pretreated corn stover (Zhao et al., 2018). The efficiency of this pretreatment can be adequately improved by the use of catalysts such as H 2 SO 4, H 3 PO 4, SO 2, or CO 2 .

US20140171664A1 - Furfural production from biomass .

US20140171664A1 - Furfural production from biomass .

Furfural is produced from a xylan-containing lignocellulosic feedstock which is contacted with water in the presence of an acid catalyst. Specifically, the catalyst is sulfuric acid characterized by a room temperature pH in the range of about 0.2 to about 0.6. The use of sulfuric acid in place of phosphoric lowers costs and avoids the high viscosity of very low pH phosphoric acid.

Steam Explosion of Beech Wood: Effect of the Particle Size .

Steam Explosion of Beech Wood: Effect of the Particle Size .

A steam explosion (SE) process was evaluated as a pretreatment method to achieve simultaneously the pretreatment and the decontamination of trace elements (TE) from woody biomass for bioethanol .

Optimization of acetic acid pretreatment of corn stover .

Optimization of acetic acid pretreatment of corn stover .

Optimization of acetic acid pretreatment of corn stover for bioethanol production Lazarus K. Limo1, Dr . Corn stover is lignocellulosic biomass that can be converted . enzymatic or chemical hydrolysis. Chemical pretreatment processes include the use of acids, alkalis, catalyzed steam-explosion, Ammonia fiber/freeze explosion (AFEX), pH .

Chemical and Physicochemical Pretreatment of .

Chemical and Physicochemical Pretreatment of .

The steam-explosion pretreatment process has been a proven technique for the pretreatment of different biomass feedstocks. It is able to generate complete sugar recovery while utilizing a low capital investment and low environmental impacts concerning the chemicals and conditions being implemented and has a higher potential for optimization and .

Methods for Pretreatment of Lignocellulosic Biomass for .

Methods for Pretreatment of Lignocellulosic Biomass for .

Figure 7. Schematic diagram of the jacketed reactor system for lime pretreatment under nonoxidative (N2 supply) and oxidative (air supply) conditions. (Reproduced from ref 93.) the material in a pile for a period of hours to weeks. The particle size of the biomass is typically 10 mm or less. Elevated temperatures reduce contact time.

US8057639B2 - System and method for preextraction of .

US8057639B2 - System and method for preextraction of .

A system has been developed for pretreating cellulosic biomass feed stock including: a first pressurized reactor receiving the feed stock, wherein the feed stock undergoes hydrolysis in the first pressurized reactor; a sealing device having a first pressurized coupling to a feedstock discharge port of the first pressurized reactor, and a second pressurized coupling to a second pressurized .

Pretreatment methods of lignocellulosic biomass for .

Pretreatment methods of lignocellulosic biomass for .

For corn straw biomass, it has been observed that with an increase in the CSF of acid pretreatment from 0.5 to 2.2, a substantially increased glucose release after enzymatic saccharification, from 32 to 57% (mass glucan/ mass untreated biomass) could be achieved (Lloyd and Wyman 2005).

Production of Biofuels from Cellulose of Woody Biomass .

Production of Biofuels from Cellulose of Woody Biomass .

Nov 03, 2011 · Steam explosion has different subcategories, such as ammonia fiber explosion and acid-explosion, in which acid or ammonia is also added to the system during the steaming process. The chemical pretreatment of cellulosic biomass includes oxidizing hydrolysis, acid or alkaline hydrolysis and solvent extraction.

Steam explosion pretreatment of softwood: the effect of .

Steam explosion pretreatment of softwood: the effect of .

Jul 22, 2016 · Steam explosion pretreatment has been examined in many studies for enhancing the enzymatic digestibility of lignocellulosic biomass and is currently the most common pretreatment method in commercial biorefineries. The information available about the effect of the explosive decompression on the biochemical conversion is, however, very limited, and no studies prove that the .

CONTINUOUS STEAM EXPLOSION OF WHEAT STRAW BY .

CONTINUOUS STEAM EXPLOSION OF WHEAT STRAW BY .

Linde et al. 2008). One challenge facing the industrial application of steam explosion pretreatment is the development and deployment of a continuous steam explosion device. In a recent study, the use of an Andritz Pressurized Refining System (Fig. 1) for continuous explosion of spruce was demonstrated (Fang et al. 2010). This system was

Effects of Biomass Particle Size in Cellulosic Biofuel .

Effects of Biomass Particle Size in Cellulosic Biofuel .

For corn stover and big bluestem, biomass particle size did not significantly affect the pelleting energy consumption (α = 0.05). Song et al. also found that the energy consumption did not change significantly when pelleting 0.45, 1, 2, and 4 mm particles; however, pelleting 8 mm particles consumed a larger amount of energy [43].

US Patent for Pretreatment of densified biomass using .

US Patent for Pretreatment of densified biomass using .

A method to convert at least a majority of native cellulose Iβ to cellulose IIII in pretreated or untreated densified biomass is disclosed. The densified biomass (cellulosic or lignocellulosic) is pretreated with anhydrous liquid ammonia or liquid ammonia comprising a solution of at least 80% ammonia. The pretreating can be performed at a temperature from about 4° C. to about 140° C. and a .

US20130017589A1 - Fractionation of lignocellulosic biomass .

US20130017589A1 - Fractionation of lignocellulosic biomass .

A process is defined for the continuous steam pretreatment and fractionation of corn cobs and low lignin lignocellulosic biomass to produce a concentrated cellulose solid stream that is sensitive to enzymatic hydrolysis. Valuable chemicals are recovered by fractionating the liquid and vapor stream composed of hydrolysis and degradation products of the hemicellulose.

Biomass Feedstock Pre-Processing – Part 1: Pre-Treatment .

Biomass Feedstock Pre-Processing – Part 1: Pre-Treatment .

Oct 18, 2010 · 3.2.1. Steam explosion. Steam explosion is one of the most applied pre-treatment processes owing to its low use of chemicals and limited energy consumption (Harmsen et al., 2010). During steam explosion pre-treatment process, the lignocellulosic biomass is heated with high pressure saturated steam having temperatures typically in the range of .

Production of Biofuels from Cellulose of Woody Biomass .

Production of Biofuels from Cellulose of Woody Biomass .

Nov 03, 2011 · Steam explosion has different subcategories, such as ammonia fiber explosion and acid-explosion, in which acid or ammonia is also added to the system during the steaming process. The chemical pretreatment of cellulosic biomass includes oxidizing hydrolysis, acid or alkaline hydrolysis and solvent extraction.

Methods of biomass pretreatment - The Texas A&M University .

Methods of biomass pretreatment - The Texas A&M University .

Feb 02, 1999 · After pretreatment, the biomass is carbonated with a carbonating agent to form calcium carbonate. Calcium carbonate is recovered from the pretreated mixture or recovered after digestion and can be reconverted into calcium hydroxide. BRIEF DESCRIPTION OF THE DRAWINGS. FIG. 1 is a schematic diagram of Reactor System 3.

A review of the thermal pretreatment of lignocellulosic .

A review of the thermal pretreatment of lignocellulosic .

Among the various pretreatment processes, steam explosion (SE) is the most commonly utilized process of lignocellulosic biomass pretreatment that treats the biomass materials structure hydrothermally. In the steam explosion, the lignocellulosic biomass is taken into the reactor and operated at a temperature of 28 C and under atmospheric pressure.

Chemical and Physicochemical Pretreatment of .

Chemical and Physicochemical Pretreatment of .

The steam-explosion pretreatment process has been a proven technique for the pretreatment of different biomass feedstocks. It is able to generate complete sugar recovery while utilizing a low capital investment and low environmental impacts concerning the chemicals and conditions being implemented and has a higher potential for optimization and .

Effect of mechanical disruption on the effectiveness of .

Effect of mechanical disruption on the effectiveness of .

There is considerable interest in the conversion of lignocellulosic biomass to liquid fuels to provide substitutes for fossil fuels. Pretreatments, conducted to reduce biomass recalcitrance, usually remove at least some of the hemicellulose and/or lignin in cell walls. The hypothesis that led to this research was that reactor type could have a profound effect on the properties of pretreated .

Pretreatment for biorefineries: a review of common methods .

Pretreatment for biorefineries: a review of common methods .

Dec 23, 2019 · Steam explosion (pretreatment) and extrusion methods. Steam explosion (or steam pretreatment) is one of the most widely investigated methods and has been so for a long time. In Table 3, a selection of results from steam pretreatment using typically investigated materials is presented. STEX has been used for many purposes on a large range of .

Pretreatment methods of lignocellulosic biomass for .

Pretreatment methods of lignocellulosic biomass for .

Mar 28, 2017 · Physicochemical pretreatment Steam explosion. Steam explosion (SE) is a well-known technique for the pretreatment of various biomass feedstocks. During SE pretreatment, lignocellulosic material is exposed to a high-pressure saturated steam at a temperature of 160–260 °C and a corresponding pressure of 5–50 atm for a few minutes.

Comparative Data from Application of Leading Pretreatment .

Comparative Data from Application of Leading Pretreatment .

May 07, 2003 · biomass pretreatment by leading pretreatment options with common source of cellulosic biomass (corn stover) and identical analytical methods – Aqueous ammonia recycle pretreatment - YY Lee, Auburn University – Water only and dilute acid hydrolysis by co-current and flowthrough systems - Charles Wyman, Dartmouth College

An economic and ecological perspective of ethanol .

An economic and ecological perspective of ethanol .

Dec 07, 2012 · Agro-industrial wastes are generated during the industrial processing of agricultural products. These wastes are generated in large amounts throughout the year, and are the most abundant renewable resources on earth. Due to the large availability and composition rich in compounds that could be used in other processes, there is a great interest on the reuse of these wastes, both from .