Corn stover is a domestic feedstock that has potential to produce significant quantities of fuel ethanol and other bioenergy and biobased products. However, comprehensive yield and carbon mass balance information and validated kinetic models for dilute-sulfuric acid (H 2 SO 4) pretreatment of corn stover have not been available. This has ...
We have explored the use of membrane extraction for removal of acetic acid, sulfuric acid, furfural, HMF and other toxic compounds from dilute acid pretreated biomass hydrolysates. The primary objective however was to remove and recover acetic acid, a potent inhibitor of …
180 C, a sulfuric acid concentration of 0.5%, and a time of 5 min. Cattails pretreated with 0.5% sulfuric acid are digestible with similar results at enzyme loadings above 15 FPU/g glucan. Glucose from cattails cellulose can be efﬁciently fermented to ethanol with an approximately 90% of the theoretical yield. The
Surface Preparation and Pretreatment for Structural Adhesives To prepare 1 liter of this solution, dissolve sodium dichromate in 700 ml of distilled water. Add sulfuric acid and mix well. Add additional distilled water to fill to 1 liter. Heat mixed solution to 66 to 71°C (150 to 160°F). Dissolve 1.5 grams
The sugars and soluble lignin in the pretreated spent liquors proceeding post-acid hydrolysis are listed in Table 2. The concentration was calculated for the original spent liquors. As discussed above, the glucose content of organic acid pretreated spent liquors were lower than sulfuric acid pretreated spent liquor.
With copper oxide, agglomeration and acid curing process are commonly used before leaching. Agglomeration aggregates ﬁne particles produced by crushing into larger particles , which improves the permeability of the heap. The ore is pretreated with concentrated sulfuric acid, which dissolves copper ions from soluble minerals, accelerating
The total sugars yields of sulfuric acid pretreated without the enzyme additions were similar with that of alkali pretreatments at high enzyme dosages (0.75 and 1 mg/g). As seen in table 1, all the Viscozyme L dosages of 0.5% sulfuric acid total sugars were significantly different from the other pretreatments, but not between the different dosages.
Dilute acid pretreatment is regarded suitable either for hydrolysis of lignocellulose or to enhance enzymatic digestibility. In particular, dilute sulfuric acid is known as the most widely tested catalyst for acidic pretreatment [16,17,46,47]. Hydrochloric acid, phosphoric acid, nitric acid and carbonic acid have also been used in ...
The goal of this work was to determine if porosity was one of the factors governing the overall enzymatic digestibility of the cellulose in dilute acid pretreated biomass. The porosity of wet pretreated corn stover was determined using the methods of solute exclusion and 1H nuclear magnetic resonance (NMR) thermoporometry.
steam vapor up to 2.5 MPa and 225 C. Corn stover was pretreated using dry dilute sulfuric acid pretreatment (DDAP) according to He et al. (2014). Brieﬂy, corn stover and dilute sulfuric acid solution were co-currently fed into the 20 L pretreatment reactor at a solid/liquid ratio of 2:1 (w/w) with sulfuric acid …
The goal of this work was to develop a model that predicts the glucose yield (pretreatment and enzymatic digestibility) of dilute acid pretreated switchgrass as a function of pretreatment process conditions (acid loading, 0-1.5 vol%, temperature, 165-195oC, and residence time, 1-10 min).
Sugar yields from dilute sulfuric acid and sulfur dioxide pretreatments and subsequent enzymatic hydrolysis of switchgrass Jian Shia, Mirvat A. Ebrika, Charles E. Wymana,b,⇑ a Center for Environmental Research and Technology, University of California, Riverside, United States bDepartment of Chemical and Environmental Engineering, Bourns College of Engineering, 1084 Columbia Avenue ...
With dry cells of 5% (w/v), the algal biomass was pretreated with sulfuric acid (1-5%) under temperatures from 100 to 120°C, from 15 to 120 min. As a result, the glucose release from the biomass was maximum at 58% (w/w) after pretreatment with 3% sulfuric acid at 110°C for 30 min. ... / Hydrothermal acid pretreatment of Chlamydomonas ...
Impact of Recycling Stillage on Conversion of Dilute Sulfuric Acid Pretreated Corn Stover to Ethanol (Poster) Conference Mohagheghi, A.; Schell, D. J. A description of methods and results from an experiment designed to assess the impact of process water recycle on corn stover-to-ethanol conversion process performance.
Combined sugar yields for dilute sulfuric acid pretreatment of corn stover followed by enzymatic hydrolysis of the remaining solids Todd A. Lloyd, Charles E. Wyman * Thayer School of Engineering, Dartmouth College, 8000 Cummings Hall, Hanover, NH 03755, United States Available online 10 …
• Dilute sulfuric acid pretreatment of corn stover was performed in a continuous pilot-scale reactor • Data was collected on xylose hydrolysis yields and enzymatic digestibilities of the pretreated cellulosic solids • The xylose yield data was used to calculate kinetic rate parameters for a biphasic xylan hydrolysis
Oct 08, 2014· Results. The presented LC/MS method involving only simple sample preparation (filtration and dilution) and external calibration for the analysis of 24 organic acids present in dilute acid pretreated biomass hydrolysate is fast (12 min) and reasonably sensitive despite the small injection volume of …
Pretreated with 0.5% sulfuric acid, the crystalline cellulose surface distributions of 23% on poplar, 28% on switchgrass and, 38% on corn stover were determined as an optimized result. Corn stover cell walls also show less recalcitrance due to more effective pretreatments and
Optimization of Dilute Sulfuric Acid Pretreatment and Enzymatic Hydrolysis of Industrial Hemp (Cannabis sativa) Mehwish Yaqoob1, Sajid Mehmood1, Muhammad Saif …
Dilute sulfuric acid pretreatment of oil palm empty fruit bunches (EFB) followed by the whole slurry fermentation of the pretreated EFB slurry was investigated. The optimized pretreatment conditions were at 1% (w/v) sulfuric acid with 3. min ramping to 190. °C in a microwave digester.
2% phosphoric acid pretreated samples. For these samples pretreatment duration was 30, 60 and 90 minutes to investigate the effect of duration (Agilent1200HPLC)on saccharification. For acid treatment dilute sulfuric acid or phosphoric acid was added to the sample, this …
To establish a simple process, the production of bio-ethanol through integration of whole pretreated slurry (WPS) of SCB with molasses was investigated. The results showed that microwave-assisted dilute sulfuric acid pretreatment reduced the formation of toxic compounds compared to a pretreatment process involving “conventional heating”.
Sugarcane bagasse was pretreated by four different methods: combined acid and alkaline, combined hydrothermal and alkaline, alkaline, and peroxide pretreatment. The raw material and the solid fraction of the pretreated bagasse were characterized according to the composition, SEM, X-ray and FTIR analysis.
The influence of dilute sulfuric acid pretreatment on biogas production from wheat plant Mohsen Taherdanak a, Hamid Zilouei , and Keikhosro Karimia,b aDepartment of Chemical Engineering, Isfahan University of Technology, Isfahan, Iran; bIndustrial Biotechnology Group, Institute of Biotechnology and Bioengineering, Isfahan University of Technology, Isfahan, Iran
Sulfuric acid concentrations of 1% and 2% were applied to test whether enzyme performance in co-hydrolysis dropped with increases in loadings of acid and of neutralization salts. For 1% sulfuric acid, pretreatment released 89% and 95% of the xylose for the lower and higher severity conditions, respectively (Figure 6).
properties of pretreated residues by scanning electron microscopy (SEM), X-ray diffraction (XRD), and Fourier transform infrared (FTIR) spectroscopy. The results showed that dilute sulfuric acid pretreatment primarily hydrolyzed hemicelluloses and resulted in enhanced cellulose and lignin content in the pretreated solids.
Dilute Sulfuric Acid Pretreatment of Switchgrass in Microwave Reactor for Biofuel Conversion: An Investigation of Yields, Kinetics, and Enzymatic Digestibility of Solids A dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy, Chemical and Life Science Engineering at ia
The researchers compared the scattering signatures of native switchgrass biomass and switchgrass that had been pretreated with hot dilute sulfuric acid. While the SANS data demonstrate that the switchgrass materials are very similar at length scales greater than 1000 Å, the materials are different at the shorter length scales studied.
Bo Zhang, Abolghasem Shahbazi (2010) Comparison of three biomass pretreatment methods: sodium hydroxide, hot water, or dilute sulfuric acid.
screen. The screened chips were soaked in 0.35% dilute sulfuric acid at 60°C for 6 h, drained overnight to approximately 40% solids, and air dried to 55% solids before pretreatment. The chips were then pretreated in a steam explosion apparatus (22) that was heated by direct steam injection to 215°C. After 140 s, the particles
Mar 15, 2019· Continuous fermentation of dilute acid-pretreated de-oiled rice bran (DRB) to butanol by the Clostridium acetobutylicum YM1 strain was investigated. Pretreatment of DRB with dilute sulfuric acid ...
Response surface methodology analysis. Rice straw was pretreated with dilute sulfuric acid under previously optimized conditions: 142°C temperature, 1.21% concentration of sulfuric acid, and 11.6 min reaction time .After the pretreatment, the solid portion comprising the treated rice straw and the liquid portion of hydrolysates containing the solubilized xylose was separated by filtration.
Impact of Recycling Stillage on Conversion of Dilute Sulfuric Acid Pretreated Corn Stover to Ethanol Ali Mohagheghi and Daniel J. Schell National Renewable Energy Laboratory, Golden, CO 80401 Objective A national laboratory of the U.S. Department of Energy Office of Energy Efficiency & Renewable Energy
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