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Reduction of Alkynes to trans-Alkenes: Sodium in Liquid Ammonia02:10

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Alkynes can be reduced to trans-alkenes using sodium or lithium in liquid ammonia. The reaction, known as dissolving metal reduction, proceeds with an anti addition of hydrogen across the carbon–carbon triple bond to form the trans product. Since ammonia exists as a gas (bp = −33°C) at room temperature, the reaction is carried out at low temperatures using a mixture of dry ice (sublimes at −78°C) and acetone. 
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Radical substitution reactions can be used to remove functional groups from molecules. The hydrogenolysis of alkyl halides is one such reaction, where the weak Sn–H bond in tributyltin hydride reacts with alkyl halides to form alkanes. Here, the reagent Bu3SnH yields tributyltin halide as a byproduct.
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Esters can be hydrolyzed to carboxylic acids under acidic or basic conditions. Base-promoted hydrolysis of esters is a nucleophilic acyl substitution reaction in which esters react with an aqueous base, followed by an acid to give carboxylic acids. This reaction is also known as saponification because it forms the basis for making soaps from fats.
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This lesson delves into the conversion of alcohols to corresponding alkyl halides and the mechanism of action for different reagents. Typically, the hydroxyl group is first protonated to convert it to a stable leaving group. Consequently, based on the starting alcohol, the mechanism undergoes either of the nucleophilic substitution routes, SN1 or SN2. Tertiary alkyl halides are made using the two-step SN1 mechanism that occurs via a carbocation intermediate, which is stabilized by...
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SN2 Reaction: Stereochemistry02:23

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In an SN2 reaction, the nucleophilic attack on the substrate and departure of the leaving group occurs simultaneously through a transition state. As the nucleophile approaches the substrate from the back-side, the configuration of the substrate carbon changes from tetrahedral to trigonal bipyramidal and then back to tetrahedral, leading to an inversion in the configuration of the product.
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Solvents01:12

Solvents

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A solvent is a substance, most often a liquid, that can dissolve other substances. Here, the substance being dissolved is called a solute. When a solvent and a solute combine, they form a solution - a homogenous mixture of both the solvent and the solute. Water is a universal biological solvent. Its polar structure allows it to dissolve many other polar compounds. The ability of water to dissolve is governed by a balance between water molecules binding to each other and binding to the solute.
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Transesterification of activated sludge in subcritical solvent mixture.

Phuong Lan Tran-Nguyen1, Alchris Woo Go2, Suryadi Ismadji3

  • 1Department of Chemical Engineering, National Taiwan University of Science and Technology, 43, Keelung Road, Section 4, Taipei 10607, Taiwan.

Bioresource Technology
|August 31, 2015
PubMed
Summary

This study introduces a novel method for biodiesel production from sludge using subcritical methanol and acetic acid. This approach significantly reduces reaction time and methanol usage while achieving comparable fatty acid methyl ester yields to traditional methods.

Keywords:
Acetic acidActivated sludgeBiodieselIn situ transesterificationSubcritical solvents

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Area of Science:

  • Chemical Engineering
  • Renewable Energy
  • Biomass Conversion

Background:

  • Traditional biodiesel production from sludge often relies on acid-catalyzed transesterification.
  • Existing methods typically involve long reaction times (approx. 24 hours) and high methanol volumes.
  • These limitations present challenges for efficient and sustainable biodiesel synthesis.

Purpose of the Study:

  • To investigate the in situ transesterification of sludge using a subcritical mixture of methanol and acetic acid.
  • To develop a more efficient biodiesel production method with reduced reaction time and methanol loading.

Main Methods:

  • Utilized in situ transesterification of sludge in a subcritical solvent mixture (85% methanol, 15% acetic acid).
  • Operated at 250°C with a solvent-to-sludge ratio of 5 mL/g.
  • Compared results with conventional acid-catalyzed (4% H2SO4) transesterification.

Main Results:

  • Achieved a fatty acid methyl ester (FAME) yield of 30.11% within 30 minutes under optimized conditions.
  • This yield is comparable to the 35% FAME yield obtained via traditional acid catalysis, which required 24 hours.
  • The new method demonstrated significantly reduced reaction time and methanol loading.

Conclusions:

  • The developed subcritical in situ transesterification method offers a faster and more methanol-efficient route for biodiesel production from sludge.
  • This approach avoids the use of harsh mineral acids, presenting a potentially greener alternative.
  • The findings suggest a viable pathway for improving the sustainability of biodiesel synthesis from waste sludge.