Efficient catalytic conversion of microalgae residue solid waste into lactic acid over a Fe-Sn-Beta catalyst

The catalytic activity and selectivity of SnCl2 for the conversion of biomass derivatives into LacA in the aqueous phase reaction system was found to be increased by the addition of choline chloride.

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Simultaneous saccharification and lactic acid fermentation of the cellulosic fraction of municipal solid waste using Bacillus smithii

Biotechnology Letters ◽

10.1007/s10529-020-03049-y ◽

2020 ◽

Author(s):

Micaela G. Chacón ◽

Christopher Ibenegbu ◽

David J. Leak

Keyword(s):

Lactic Acid ◽

Municipal Solid Waste ◽

Solid Waste ◽

Lactic Acid Production ◽

Lactic Acid Fermentation ◽

Potential Candidate ◽

Acid Fermentation ◽

Promising Candidate ◽

Cellulosic Pulp ◽

Simultaneous Saccharification

Abstract Objective A primary drawback to simultaneous saccharification and fermentation (SSF) processes is the incompatibility of the temperature and pH optima for the hydrolysis and fermentation steps—with the former working best at 50–55 °C and pH 4.5–5.5. Here, nine thermophilic Bacillus and Parageobacillus spp. were evaluated for growth and lactic acid fermentation at high temperature and low pH. The most promising candidate was then carried forward to demonstrate SSF using the cellulosic fraction from municipal solid waste (MSW) as a feedstock. Results B. smithii SA8Eth was identified as the most promising candidate and in a batch SSF maintained at 55 °C and pH 5.0, using a cellulase dose of 5 FPU/g glucan, it produced 5.1 g/L lactic acid from 2% (w/v) MSW cellulosic pulp in TSB media. Conclusion This work has both scientific and industrial relevance, as it evaluates a number of previously untrialled bacterial hosts for their compatibility with lignocellulosic SSF for lactic acid production and successfully identifies B. smithii as a potential candidate for such a process.

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Hydrothermal Catalytic Conversion of Glucose into Lactic Acid with Acidic MIL-101(Fe)

Journal of Chemistry ◽

10.1155/2020/1341563 ◽

2020 ◽

Vol 2020 ◽

pp. 1-7

Author(s):

Xiaofang Liu ◽

Zhigang Liu ◽

Qiuyun Zhang ◽

Hongguo Wu ◽

Rui Wang

Keyword(s):

Catalytic Activity ◽

Lactic Acid ◽

Reaction Time ◽

Specific Surface ◽

Catalytic Conversion ◽

Temperature Reaction ◽

Reaction Parameters ◽

Acid Properties ◽

Catalyst Reusability ◽

First Time

MIL-101(Fe) was explored for the first time for the catalytic conversion of glucose into lactic acid (LA). The as-synthesized MIL-101(Fe) was successfully characterized, and its higher specific surface area, porosity, and feasible acid properties were confirmed to determine the remarkable catalytic activity in glucose-to-LA conversion (up to 25.4% yield) compared with other catalysts like MIL-101(Cr, Al) and UiO-66(Zr). The reaction parameters including temperature, reaction time, and substrate species as well as catalyst reusability were discussed.

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