Use of glycerol, waste glycerol from biodiesel production and other protic solvents in bioactive α,β-unsaturated ketones synthesis

2020 ◽  
Vol 16 ◽  
pp. 100250
Author(s):  
Guilherme Silva Torrezan ◽  
Carlos Roberto Polaquini ◽  
Marcelo Freitas Lima ◽  
Luis Octavio Regasini
Keyword(s):  
Biodiesel Production ◽  
Unsaturated Ketones ◽  
Waste Glycerol ◽  
Protic Solvents

scholarly journals A Review of Catalytic Upgrading of Biodiesel Waste Glycerol to Valuable Products

2020 ◽  
Vol 7 (3) ◽  
pp. 259-266
Author(s):  
Xue-Lian Li ◽  
Quan Zhou ◽  
Shen-Xi Pan ◽  
Yu He ◽  
Fei Chang
Keyword(s):  
Rapid Development ◽  
Production Capacity ◽  
Value Added ◽  
High Energy ◽  
Raw Material ◽  
Biodiesel Production ◽  
Catalytic Upgrading ◽  
Waste Glycerol ◽  
Catalytic Mechanisms ◽  
Specific Reactions

: Glycerol is an organic polyol compound, and is an important raw material with extensive applications in daily/petrochemical and pharmaceutical industry. Glycerol is typically obtained by propylene chlorination, while the method used is complicated process and requires high energy consumption. Interestingly, glycerol is recognized as a major by-product of biodiesel production. Approximately 100 kg of glycerol is yielded for 1 tonne of biodiesel production. With the rapid development of the biodiesel industry, glycerol production capacity has been a serious surplus. This review introduces the selective conversion of glycerol into a variety of value-added chemicals such as propylene glycol, propanol, glyceraldehyde, and dihydroxyacetone via selective hydrogenation and oxidation, as well as hydrocarbons and ethers via pyrolysis, gasification and etherification, respectively. The efficiency of different types of catalysts and the influence of reaction parameters on the valorisation of glycerol have been elucidated. Emphasis is also laid on the study of catalytic mechanisms and pathways for some specific reactions.

scholarly journals Production of lactic acid by Enterococcus faecalis on waste glycerol from biodiesel production

2020 ◽  
Vol 26 (2) ◽  
pp. 151-156
Author(s):  
Jovan Ciric ◽  
Natasa Jokovic ◽  
Slavica Ilic ◽  
Sandra Konstantinovic ◽  
Dragisa Savic ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Carbon Source ◽  
Enterococcus Faecalis ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Raw Material ◽  
Biodiesel Production ◽  
Waste Glycerol ◽  
Pure Glycerol ◽  
Microbial Utilization

Waste glycerol from biodiesel production is a valuable raw material that has been used to produce valuable microbial metabolites. In this work, the possibility of microbial utilization of waste glycerol obtained as a by-product in biodiesel production from sunflower and rapeseed oil by the lactic acid bacterium Enterococcus faecalis MK3-10A on a laboratory level was studied. For comparison, pure glycerol and glucose were used as carbon sources. The kinetics of the microbial biomass growth, the carbon source utilization, and the lactic acid production were monitored. The bacterium E. faecalis MK3-10A better grew in the media with glucose or pure glycerol as a carbon source, but the lactic acid production rate was the highest (14.6 mg/(ml/day)) in the medium with waste glycerol from the sunflower oil-based biodiesel production. Therefore, this waste glycerol might be a promising carbon source for lactic acidbacteria cultivation and lactic acid production.

scholarly journals Valorization of Waste Glycerol to Dihydroxyacetone with Biocatalysts Obtained from Gluconobacter oxydans

2018 ◽  
Vol 8 (12) ◽  
pp. 2517 ◽  
Author(s):  
Lidia Stasiak-Różańska ◽  
Anna Berthold-Pluta ◽  
Pritam Dikshit
Keyword(s):  
Crude Glycerol ◽  
Gluconobacter Oxydans ◽  
Product Yield ◽  
Cell Extract ◽  
Free Cell ◽  
Biodiesel Production ◽  
Glycerol Concentration ◽  
Immobilized Cell ◽  
Waste Glycerol ◽  
Valuable Compounds

Waste glycerol is the main by-product generated during biodiesel production, in an amount reaching up to 10% of the produced biofuel. Is there any method which allows changing this waste into industrial valuable compounds? This manuscript describes a method for valorization of crude glycerol via microbial bioconversion. It has been shown that the use of free and immobilized biocatalysts obtained from Gluconobacter oxydans can enable beneficial valorization of crude glycerol to industrially valuable dihydroxyacetone. The highest concentration of this compound, reaching over 20 g·L−1, was obtained after 72 h of biotransformation with free G. oxydans cells, in a medium containing 30 or 50 g·L−1 of waste glycerol. Using a free cell extract resulted in higher concentrations of dihydroxyacetone and a higher valorization efficiency (up to 98%) compared to the reaction with an immobilized cell extract. Increasing waste glycerol concentration to 50 g·L−1 causes neither a faster nor higher increase in product yield and reaction efficiency compared to its initial concentration of 30 g·L−1. The proposed method could be an alternative for utilization of a petrochemical waste into industry applicated chemicals.

scholarly journals Microbial Production of 2,3- Butanediol From Waste Glycerol

2017 ◽  
pp. 960-974
Author(s):  
S. Yankova ◽  
P. Begova ◽  
V. Beschkov
Keyword(s):  
Klebsiella Oxytoca ◽  
Substrate Inhibition ◽  
Practical Importance ◽  
Product Formation ◽  
Biodiesel Production ◽  
Glycerol Concentration ◽  
Market Demand ◽  
Alkaline Catalyst ◽  
Waste Glycerol ◽  
High Yields

An inevitable waste from biodiesel production is glycerol, contaminated by alkaline catalyst, water and methanol and released in quite big amounts, exceeding its market demand. One way of its utilization is production of different bulk and fine chemicals, for example 2,3- butanediol. The latter is used as a precursor for manufacturing of plastics, synthetic rubber, some pharmaceuticals, etc. In the present paper the ability of the strain Klebsiella oxytoca VA 8391 to produce this compound under batch and fed-batch conditions was studied at initial glycerol concentrations between 10 and 30 g dm-3. Experiments have been carried out in shaking flasks. The bacteria cultivation was at 37oC and stirred conditions at 200 rpm, whereas the product formation was studied both under stirred and still conditions. It was found out that the used strain is capable to produce selectively 2,3- butanediol with very high yields of practical importance (up to 92 %) and no contamination by other products. The optimum glycerol concentration was 20 g dm-3. At higher initialconcentrations substrate inhibition started to occur. It was established that the studied fermentation process required aerobic bacteria cultivation followed by anoxic period of product formation by the developed culture. Only in this case high yields were attained.

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