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Related Concept Videos

Biofuels01:25

Biofuels

The microbial conversion of organic matter into biofuels holds potential as a renewable energy source. Among biofuel sources, microalgae are recognized as a highly efficient and adaptable feedstock for biodiesel production, owing to their rapid biomass accumulation, elevated lipid productivity, and capacity to proliferate in diverse aquatic systems, including freshwater, marine, and wastewater habitats. Unlike terrestrial crops, microalgae do not compete for land and can achieve significantly...
Production of Organic Acids01:25

Production of Organic Acids

Lactic acid, an important organic acid extensively applied in food, pharmaceutical, and biodegradable polymer industries, is primarily produced via microbial fermentation. This method is favored over chemical synthesis due to its environmental sustainability and capacity for enantiomerically pure product formation. Among various microbial processes, the fermentation of starch-based substrates stands out due to the abundance and renewability of raw materials like corn and potatoes.Hydrolysis of...
Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview01:20

Carboxylic Acids to Esters: Acid-Catalyzed (Fischer) Esterification Overview

The Fischer esterification reaction was developed by the German chemist Emil Fischer in 1895. It is a condensation reaction between carboxylic acids and alcohols in an acidic medium to give esters and water.
Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis01:07

Alkylation of β-Ketoester Enolates: Acetoacetic Ester Synthesis

Acetoacetic ester synthesis is a method to obtain ketones from alkyl halides and β-keto esters. The reaction occurs in the presence of an alkoxide base that abstracts the acidic proton of the β-keto esters. The step results in an enolate ion which is doubly stabilized. The enolate then reacts with an alkyl halide via the SN2 process to produce an alkylated ester intermediate with a new C–C bond. The hydrolysis of the intermediate, followed by acidification, results in an alkylated β-keto acid.
Alkylation of β-Diester Enolates: Malonic Ester Synthesis01:14

Alkylation of β-Diester Enolates: Malonic Ester Synthesis

Malonic ester synthesis is a method to obtain α substituted carboxylic acids from ꞵ-diesters such as diethyl malonate and alkyl halides.

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Related Experiment Video

Updated: Jul 3, 2026

Experimental Protocol for Biodiesel Production with Isolation of Alkenones as Coproducts from Commercial Isochrysis Algal Biomass
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Published on: June 24, 2016

Ionic liquid supported acid/base-catalyzed production of biodiesel.

Alexandre A M Lapis1, Luciane F de Oliveira, Brenno A D Neto

  • 1Laboratory of Molecular Catalysis, Institute of Chemistry-UFRGS, Av. Bento Gonçalves, 9500 Porto Alegre 91501-970 RS, Brazil.

Chemsuschem
|August 8, 2008
PubMed
Summary

Imidazolium-based ionic liquids efficiently synthesize biodiesel from vegetable oils via transesterification. This method offers high yields and reusability of the catalyst, making it a sustainable approach for biodiesel production.

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Laboratory Production of Biofuels and Biochemicals from a Rapeseed Oil through Catalytic Cracking Conversion

Published on: September 2, 2016

Area of Science:

  • Green Chemistry
  • Catalysis
  • Renewable Energy

Background:

  • Biodiesel synthesis typically involves transesterification of vegetable oils.
  • Conventional catalysts can be corrosive and difficult to recover.
  • Ionic liquids offer potential as reusable and stable reaction media.

Purpose of the Study:

  • To synthesize biodiesel from vegetable oils using imidazolium-based ionic liquids.
  • To evaluate the efficiency of ionic liquids under acidic and basic multiphase conditions.
  • To assess the reusability and stability of the ionic liquid catalyst system.

Main Methods:

  • Transesterification of soybean oil with various alcohols using specific ionic liquids (BMINTf2).
  • Utilizing both basic (K2CO3) and acidic (H2SO4 immobilized in BMINTf2) catalytic systems.
  • Separation of biodiesel product and glycerol by-product in multiphase systems.

Main Results:

  • High biodiesel yields (>98%) and purity achieved using BMINTf2 under basic conditions with K2CO3.
  • Immobilized H2SO4 in BMINTf2 efficiently catalyzed transesterification with various alcohols.
  • The ionic liquid catalyst, containing immobilized acid, was reused at least six times without significant loss in yield or selectivity.
  • Biodiesel formed a separate phase, facilitating easy separation, while glycerol was captured by the alcohol-ionic liquid phase.
  • Classical ionic liquids (e.g., tetrafluoroborate, hexafluorophosphate) decomposed under the reaction conditions.

Conclusions:

  • Imidazolium-based ionic liquids, particularly BMINTf2, are effective and reusable catalysts for biodiesel synthesis.
  • The multiphase system allows for efficient product separation and catalyst recovery, enhancing process sustainability.
  • This ionic liquid-mediated approach provides a stable and efficient alternative to conventional biodiesel production methods.