Different pretreatment technologies of lignocellulosic biomass for bioethanol production: an overview.

Effect of acid pretreatment on different parts of corn stalk for second generation ethanol production

Characterization of microwave-alkali-acid pre-treated rice straw for optimization of ethanol production via simultaneous saccharification and fermentation (SSF)

Ultrasound-assisted alkaline pretreatment for enhancing the enzymatic hydrolysis of rice straw by using the heat energy dissipated from ultrasonication

Lignocellulosic ethanol production: Evaluation of new approaches, cell immobilization and reactor configurations

Pretreatment of rice straw for ethanol production by a two-step process using dilute sulfuric acid and sulfomethylation reagent

Coproduction of xylose, lignosulfonate and ethanol from wheat straw

Lignocellulosic biomass (LB) is potentially a relatively inexpensive and abundant feedstock for ethanol production. One of the most challenging steps during the lignocellulosic ethanol production is to convert the carbohydrates in LB to the fermentable reducing sugars (FRS) in an economically viable and environmentally friendly way. The acid-catalyzed hydrolysis of LB in ionic liquids (ILs) has provided a promising technical tool to improve upon the traditional FRS production process. Compared to the conventional FRS production process from LB via the acid or enzymatic hydrolysis method, it has many advantages, such as a simplified process, mild reaction conditions, low acid consumption, and low equipment investment. However, there are still some technical challenges that need to be solved regarding its use at an industrial scale, for example, improving its reaction selectivity, developing effective methods to separate the FRS and ILs, and alleviating the negative effect of the remaining ILs in FRS on subsequent ethanol fermentation. This editorial will give a brief discussion about opportunities and challenges of the acid catalyzed hydrolysis of LB in ILs for ethanol production.

https://ojs.cnr.ncsu.edu/index.php/BioRes/article/download/BioRes_11_1_Editorial_Zhu_Hydrolysis_Lignocellulosic_Biomass/3972

Acid-Catalyzed Hydrolysis of Lignocellulosic Biomass in Ionic Liquids for Ethanol Production: Opportunities & Challenges

The effects of ionic liquid 1-butyl-3-methylimidazolium chloride (BMIMCl) on the ethanol fermentation process of Saccharomyces cerevisiae AY93161 were investigated by using microcalorimetry. On the basis of microcalorimetric and process data, the thermokinetic parameters of the ethanol fermentation process at different BMIMCl concentrations from 0.001 to 5 gL were calculated. Compared to the control, the BMIMCl caused a decreased value of the maximum specific growth rate μm (from 0.226 to 0.105 h), and an increased value of the maximum specific produced heat rate pm (from 2.08 to 7.06 mWlg ) and the total heat output H for producing 1 g ethanol (from 990 to 1871 Jg). The decreased μm and increased pm and H led to lower final yeast concentration (from 3.85 to 2.39 gL) and ethanol concentration (from 40.3 to 25.1 gL). This gives useful information for improving the lignocellulosic ethanol production process using the ionic liquid technology.

https://openbiotechnologyjournal.com/VOLUME/10/PAGE/391/PDF/

Microcalorimetric Investigation of the Effect of the Ionic Liquid 1-butyl-3-methylimidazolium Chloride on the Fermentation of Saccharomyces cerevisiae AY93161 for Lignocellulosic Ethanol Production

To evaluate the influence of 1-butyl-3-methylimidazolium chloride ((Bmim)Cl) on the ethanol fermentation process of Pichia pastoris GS115, this paper investigated the yeast growth, ethanol formation and the fermentable sugars consumption during the ethanol fermentation process of Pichia pastoris GS115 at different (Bmim)Cl concentrations in the medium. The results indicated that the (Bmim)Cl had no influence on the ethanol fermentation process at its concen- tration less than 0.0001 g.L -1 . The (Bmim)Cl inhibited the yeast growth and had a negative effect on ethanol formation at its concentration higher than 0.0001 g.L -1 . The final biomass and ethanol concentration, and the overall ethanol yield from the fermentable sugars all decreased with its concentration increasing. The yeast growth was very slow and nearly no ethanol formed when its concentration reached 5 g.L -1 . Compared to Saccharomyces cerevisiae, the growth of Pichia pas- toris GS115 was more sensitive to the (Bmim)Cl, and its ethanol fermentation had lower final ethanol concentration and overall ethanol yield from fermentable sugars at the same (Bmim)Cl concentration. This work provides useful information on selecting suitable strains for ethanol fermentation containing the (Bmim)Cl in the medium.

/pdf/influence-of-1-butyl-3-methylimidazolium-chloride-on-the-30h05syl6a.pdf

Ke Wang

Papers

Pretreatment of rice straw for ethanol production by a two-step process using dilute sulfuric acid and sulfomethylation reagent

Coproduction of xylose, lignosulfonate and ethanol from wheat straw

Acid-Catalyzed Hydrolysis of Lignocellulosic Biomass in Ionic Liquids for Ethanol Production: Opportunities & Challenges

Microcalorimetric Investigation of the Effect of the Ionic Liquid 1-butyl-3-methylimidazolium Chloride on the Fermentation of Saccharomyces cerevisiae AY93161 for Lignocellulosic Ethanol Production

Influence of 1-butyl-3-methylimidazolium Chloride on the EthanolFermentation Process of Pichia pastoris GS115