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Aromatic Compounds: Overview01:25

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In general, the term ‘aromatic’ indicates a pleasant smell or fragrance from fresh flowers, freshly prepared coffee, etc. In the early history of organic chemistry, many benzene derivatives were isolated from the pleasant odor oils of the plants. For example, vanillin was isolated from the oil of vanilla, methyl salicylate from the oil of wintergreen, and cinnamaldehyde from the oil of cinnamon. They all had a pleasant odor; hence the name aromatic was given.
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Simple aryl halides do not react with nucleophiles under normal conditions. However, the reaction can proceed under drastic conditions involving high temperatures and high pressure to give the substituted products. For example, chlorobenzene is converted to phenol using aqueous sodium hydroxide at 350 °C under high pressure by the Dow process. The reaction follows an elimination-addition mechanism involving a benzyne intermediate. Here, the chloride ion is...
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Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
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Compounds bearing two hydroxyl groups are known as diols. When the hydroxyl groups are located on adjacent carbon atoms, the diols are called vicinal diols or glycols. Under acidic conditions, vicinal diols undergo a specific reaction called pinacol rearrangement.
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From Pulp to Aromatic Products-Reaction Pathways of Lignin Depolymerization.

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Summary

This study explored lignin depolymerization using hydrothermal liquefaction (HTL) of black liquor. Catechol derivatives were primary monomers, with demethoxylation, demethylation, and alkylation identified as key reactions.

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Area of Science:

  • Chemical Engineering
  • Biomass Conversion
  • Organic Chemistry

Background:

  • Lignin, a byproduct of paper production, is abundant but underutilized.
  • Black liquor (BL) contains lignin and can be directly used as feedstock.
  • Hydrothermal liquefaction (HTL) offers a pathway for lignin valorization.

Purpose of the Study:

  • Investigate lignin depolymerization into aromatic monomers via HTL.
  • Elucidate reaction pathways and kinetics of lignin conversion.
  • Utilize black liquor directly as a feedstock to simplify the process.

Main Methods:

  • Batch and continuous hydrothermal liquefaction experiments.
  • Utilized black liquor and lignin model substances.
  • Analyzed products using 31P NMR, 13C NMR, and size exclusion chromatography.

Main Results:

  • Catechol derivatives identified as major aromatic monomers.
  • Key reactions include demethoxylation, demethylation, and alkylation.
  • Higher temperatures led to decreased monomer yield and increased solid product formation due to repolymerization.

Conclusions:

  • Developed a reaction scheme for lignin depolymerization during HTL.
  • Demonstrated direct use of black liquor as feedstock is feasible.
  • Findings pave the way for developing a lignin HTL reaction kinetic model.