Two-stage pretreatment of rice straw using aqueous ammonia and dilute acid

Abstract. Degradation of lignin from lignocellulosic biomass plays a main key role in converting of lignocelluloses to bioethanol. The pretreatment of lignocelluloses is needed to enhance the fermentable sugars production from enzymatic hydrolysis. This research studied the effect of dilute sulfuric acid pretreatment on the ethanol production using alkaline-dilute acid pretreatment. This research used two stages of the pretreatment process. The first stage used NaOH solution with ratio of rice husk and NaOH solution (1:10 w/v). On the second stage, five concentrations of sulfuric acid of 1 to 5% at temperature of 121 o C and various heating times (30-90 min) were investigated. The ethanol production from pretreated rice husk was conducted by the simultaneous saccharification and fermentation (SSF) for various SSF times of 72-160 hr. The experimental results indicated that an increase in concentration of sulfuric acid capable to destroy the lignocellulosic structure of rice husk. The highest value of cellulose content was achieved about 88.84 % for acid pretreated material at H 2 SO 4 concentration of 2% in 90 minutes. The lignin reduction ranged from 47.46% to 79.29%. The highest ethanol concentration obtained was 13.68 g/L for the SSF time of 120 hours and the sulfuric acid concentration of 3 %.

show abstract

“…It was proceed in two stages of pretreatment using hydroxide-dilute sulfuric acid. This is reasonable result with the previous study [17].…”

Section: Effect Of Sulfuric Acid Concentration On Bioethanol Concentrsupporting

confidence: 93%

“…In the other hand, previous researchers [17] investigated the two-steps of rice straw pretreated via aqueous ammonia and dilute sulfuric acid.…”

Section: Introductionmentioning

confidence: 99%

Bioethanol production from sodium hydroxide – dilute sulfuric acid pretreatment of rice husk via simultaneous saccharification and fermentation

2017

View full text Add to dashboard Cite

show abstract

“…Pretreatment of bermuda grass and rye straw with 1.5% sulphuric acid followed by enzymatic hydrolysis yielded 19.71 and 22.93% reducing sugars from bermuda grass and rye straw, respectively (Sun and Cheng 2005). Kim et al (2011a, b) carried pretreatment of rice straw in two-stage process using aqueous ammonia and dilute H 2 SO 4 in percolation mode. The yield of reducing sugars was observed to be 96.9 and 90.8%, respectively, indicating that combination of these two processes resulted in better removal of lignin and hemicelluloses.…”

Section: Methods Of Pretreatmentmentioning

confidence: 99%

“…Further purification may be carried out through ionic liquids which are discussed later in this review (Prado et al 2012). The less toxic nature of ethanol as compared to methanol and it being the final product makes it more popular as compared to other solvents (Kim et al 2011a, b). However, presence of ethanol inhibits the performance of hydrolytic enzymes, therefore lower ethanol: water is used for hydrolysis of hemicellulose and enzymatic degradation of pretreated biomass (Huijgen et al 2008).…”

Section: Methods Of Pretreatmentmentioning

confidence: 99%

Recent updates on different methods of pretreatment of lignocellulosic feedstocks: a review

Kumar

Sharma

2017

Bioresour. Bioprocess.

1,038

446

View full text Add to dashboard Cite

Lignocellulosic feedstock materials are the most abundant renewable bioresource material available on earth. It is primarily composed of cellulose, hemicellulose, and lignin, which are strongly associated with each other. Pretreatment processes are mainly involved in effective separation of these complex interlinked fractions and increase the accessibility of each individual component, thereby becoming an essential step in a broad range of applications particularly for biomass valorization. However, a major hurdle is the removal of sturdy and rugged lignin component which is highly resistant to solubilization and is also a major inhibitor for hydrolysis of cellulose and hemicellulose. Moreover, other factors such as lignin content, crystalline, and rigid nature of cellulose, production of post-pretreatment inhibitory products and size of feed stock particle limit the digestibility of lignocellulosic biomass. This has led to extensive research in the development of various pretreatment processes. The major pretreatment methods include physical, chemical, and biological approaches. The selection of pretreatment process depends exclusively on the application. As compared to the conventional single pretreatment process, integrated processes combining two or more pretreatment techniques is beneficial in reducing the number of process operational steps besides minimizing the production of undesirable inhibitors. However, an extensive research is still required for the development of new and more efficient pretreatment processes for lignocellulosic feedstocks yielding promising results.

show abstract

“…Cellulosic cassava pulp prepared in the previous section was treated with H 2 SO 4 and sodium hydroxide (NaOH) at various concentrations ranging from 0 to 4 wt%, and put in sealed bottles. Temperatures were adjusted at the range of 60-120 °C with the incubation time of 10-30 min, respectively [7]. The solid loading was at 10 %wt.…”

Section: Pre-treatment Of Cellulosic Cassava Pulpmentioning

confidence: 99%

Efficient Process Development for Cellulosic Ethanol Fermentation from Cassava Pulp

Samnuknit¹,

Boontawan²,

Boontawan³

2017

IJCEA

View full text Add to dashboard Cite

Abstract-Ethanol has gain an increasing popularity to be used as biofuels. Various renewable agricultural feed stocks can be used for the fermentation process especially lignocellulosic materials. Pre-treatment of these materials for lignin removal is essential in order to obtain cellulose and hemi-cellulose. In this work, saccharification of cellulosic cassava pulp employed 2 steps of alkaline pretreatment, and enzymatic conversion. Experimental results showed that the reducing sugar was obtained at about 714 mg/g substrate . S. cerevisiae, and P. stipitis showed its ability to ferment glucose and xylose, an abundant C 5 monosaccharide in lignocellulose materials. The produced fermentable sugars can be further converted to ethanol to 40.50 g/L. The process development of this particular system still required further pilot scale tests as well as process simulation. These results could pave a way for the application in an industrial scale cellulosic ethanol production.

show abstract

Two-stage pretreatment of rice straw using aqueous ammonia and dilute acid

Cited by 111 publications

References 22 publications

Bioethanol production from sodium hydroxide – dilute sulfuric acid pretreatment of rice husk via simultaneous saccharification and fermentation

Bioethanol production from sodium hydroxide – dilute sulfuric acid pretreatment of rice husk via simultaneous saccharification and fermentation

Recent updates on different methods of pretreatment of lignocellulosic feedstocks: a review

Efficient Process Development for Cellulosic Ethanol Fermentation from Cassava Pulp

Contact Info

Product

Resources

About