Optimization of dilute acid and alkaline peroxide pretreatment to enhance bioethanol production from wheat straw by co-fermentation

Karagöz, Pınar; Özkan, Melek

doi:10.5505/tjb.2013.57431

Cited by 3 publications

(3 citation statements)

References 32 publications

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“…As seen in Table II, amount of sugars leaving the raw material and entering the liquid fraction changed with respect to the pre-treatment condition [10,22]. Increasing biomass loading in solvent resulted in decrease especially in precipited lignin and decrease lignin content which remains in biomass [Table II].…”

Section: A Optimization Of Sodium Hidroxide Pre-treatmentmentioning

confidence: 99%

Optimization of Pre-treatment Process of Cocoa Pod Husk Using Various Chemical Solvents

Nazir¹,

Novelina²,

Juita³

et al. 2016

International Journal on Advanced Science, Engineering and Information Technology

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The purpose of research is to see the effect of type of reagent (NaOH, H 2 O 2 and H 2 SO 4) and the condition of pretreatment of cocoa pod husk towards lignin content after pre-treatment and hydrolysis, reducing sugar and total sugar content. Response Surface Method (RSM) was used to optimize process conditions of pre-treatment (delignification). Hydrolysis for all pretreated sample were carried out using 3% H 2 SO 4 with a ratio of cocoa pod husk to solvent (1:10) for 2 hours at a temperature of 110 o C using an autoclave. The chemical pre-treatment with NaOH was optimized by varying the concentrations of NaOH (4-8% (w/v), centre point: 6%), reaction time (60-100 minutes, centre point: 80 minutes) and ratio of biomass to solvent (1:15-1:25, centre point 1:20 w/v). The optimum conditions in this study was at the concentration of NaOH (X 1) of 4% w/v, reaction time (X 2) of 100 minutes; ratio of biomass/solvent (X 3) of 1:25 (w/v). The lignin content after pre-treatment was 15.03% lignin, lignin content after hydrolysis was 19.57%, 11.75% of reducing sugar, and 12.78% of total sugar. The chemical pre-treatment with alkaline peroxide (H 2 O 2) was optimized by varying the concentrations of H 2 O 2 (4-7% w/v, centre point 5.5% (w/v)), reaction time (40-90 minutes, centre point: 65 minutes), and ratio of biomass/solvent (4-7% w/v). The optimum conditions in this study was at the concentration of H 2 O 2 concentration (X 1) of 5.52% w/v, reaction time (X 2) of 61.97 minutes, biomass loading in solvent (X 3) 7% w/v. The lignin content after pre-treatment was 8.759, lignin content after hydrolysis was 25.029%, 8.169% of reducing sugar, and 10.371% of total sugar. The chemical pre-treatment with H 2 SO 4 was optimized by varying the concentrations of H 2 SO 4 (0.5-1.5% w/v), reaction time (60-120 minutes, centre point: 90 minutes), and ratio of biomass to solvent (1:4-1:6 w/v, centre point 1:5 w/v). The optimum conditions was reached without hydrolysis. The optimum condition this study is at the H 2 SO 4 concentration (X 1) of 1.5%, reaction time (X 2) of 120 minutes, ratio of biomass/solvent (X 3) of 6%. The lignin content after pre-treatment was 18.8%, 15.59% of reducing sugar and 20.49% of total sugar.

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Section: A Optimization Of Sodium Hidroxide Pre-treatmentmentioning

confidence: 99%

Optimization of Pre-treatment Process of Cocoa Pod Husk Using Various Chemical Solvents

Nazir¹,

Novelina²,

Juita³

et al. 2016

International Journal on Advanced Science, Engineering and Information Technology

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“…However, this yield was comparative to the reported results for dilute acid pretreated wheat straw. 26,33 For example, Saha et al, reported an ethanol concentration of 13 AE 2 g L À1 with yield of 0.17 g ethanol per g raw material aer wheat straw was pretreated by 0.75% H 2 SO 4 at 121 C for 1 h; 26 Karagöz and Özkan reported an ethanol yield of 0.2195 g ethanol per g sugar (43% of theoretic yield), corresponding to 0.1187 g ethanol per g raw material aer the biomass was pretreated with 1% H 2 SO 4 at 140 C for 90 min. 33 The neutralized acid hydrolyzate could be directly utilized by a mutagenized Rhodosporidium toruloides (M18) for lipid accumulation.…”

Section: Discussionmentioning

confidence: 99%

“…26,33 For example, Saha et al, reported an ethanol concentration of 13 AE 2 g L À1 with yield of 0.17 g ethanol per g raw material aer wheat straw was pretreated by 0.75% H 2 SO 4 at 121 C for 1 h; 26 Karagöz and Özkan reported an ethanol yield of 0.2195 g ethanol per g sugar (43% of theoretic yield), corresponding to 0.1187 g ethanol per g raw material aer the biomass was pretreated with 1% H 2 SO 4 at 140 C for 90 min. 33 The neutralized acid hydrolyzate could be directly utilized by a mutagenized Rhodosporidium toruloides (M18) for lipid accumulation. Detoxication with activated charcoal thus can be eliminated, which shows promise to reduce production cost, because that detoxication with activated charcoal adsorption is usually expensive and may cause a signicant loss of sugars.…”

Section: Discussionmentioning

confidence: 99%

Biological co-production of ethanol and biodiesel from wheat straw: a case of dilute acid pretreatment

2014

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Ethanol production from wheat straw by Saccharomyces cerevisiae and Scheffersomyces stipitis co-culture in batch and continuous system

Karagöz

Özkan

2014

Bioresource Technology

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Optimization of dilute acid and alkaline peroxide pretreatment to enhance bioethanol production from wheat straw by co-fermentation

Cited by 3 publications

References 32 publications

Optimization of Pre-treatment Process of Cocoa Pod Husk Using Various Chemical Solvents

Optimization of Pre-treatment Process of Cocoa Pod Husk Using Various Chemical Solvents

Biological co-production of ethanol and biodiesel from wheat straw: a case of dilute acid pretreatment

Ethanol production from wheat straw by Saccharomyces cerevisiae and Scheffersomyces stipitis co-culture in batch and continuous system

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