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Related Concept Videos

Preparation and Reactions of Thiols02:33

Preparation and Reactions of Thiols

Thiols are prepared using the hydrosulfide anion as a nucleophile in a nucleophilic substitution reaction with alkyl halides. For instance, bromobutane reacts with sodium hydrosulfide to give butanethiol.
Microbes and the Sulfur Cycle01:29

Microbes and the Sulfur Cycle

Sulfur is a vital element in Earth's biogeochemical systems. It transitions through various inorganic states, including sulfate (SO₄²⁻), elemental sulfur (S⁰), and sulfide (S²⁻). Abiotic and biological mechanisms across oxic and anoxic environments intricately mediate these transformations. Sulfate, the most oxidized form of sulfur, is predominantly stored in rocks, marine sediments, and oceanic waters, acting as a long-term reservoir in the global sulfur cycle.In oxic environments,...
Structure and Nomenclature of Thiols and Sulfides02:17

Structure and Nomenclature of Thiols and Sulfides

Thiols and sulfides are sulfur analogs of alcohols and ethers, respectively, where the sulfur atom takes the place of the oxygen atom. Thus, thiols are generally represented as RSH, where R is an alkyl substituent and —SH is the functional group. On the other hand, in sulfides, the central sulfur atom is bonded to two hydrocarbon groups on either side. Depending upon the type of group, sulfides can be either symmetrical or asymmetrical. Both thiols and sulfides display a bent geometry, similar...
The Sulfur Cycle01:22

The Sulfur Cycle

Sulfur, an important element in the chemical makeup of proteins, is recycled through the atmosphere and aquatic and terrestrial environments. Found in the atmosphere as sulfur dioxide (SO2), sulfur is released by decaying organisms, weathered rocks, geothermal vents, volcanos, and burning fossil fuels. It is deposited into the ecosystem, cycled through the biotic community, and either released back into the atmosphere as gas or deposited in marine sediment for long-term storage and eventual...
Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
Aromatic Compounds: Overview01:25

Aromatic Compounds: Overview

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.
In 1825, Faraday isolated benzene...

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Related Experiment Video

Updated: May 10, 2026

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes
07:49

On-line Analysis of Nitrogen Containing Compounds in Complex Hydrocarbon Matrixes

Published on: August 5, 2016

Thiophenic Sulfur Compounds Released During Coal Pyrolysis.

Mengwen Xing1, Jiao Kong, Jie Dong

  • 1Key Laboratory of Coal Science and Technology, co-founded by Shanxi Province and the Ministry of Science and Technology, Taiyuan University of Technology , Taiyuan, China .

Environmental Engineering Science
|June 20, 2013
PubMed
Summary

This study investigated thiophenic sulfur compounds released during coal pyrolysis. Findings reveal how temperature, heating rates, and coal sulfur content influence the formation of benzothiophene and dibenzothiophene for cleaner coal use.

Keywords:
PY-GC-MSbenzothiophenecoal pyrolysisdibenzothiophene

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Last Updated: May 10, 2026

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06:51

Quantitative Analysis by Thermogravimetry-Mass Spectrum Analysis for Reactions with Evolved Gases

Published on: October 29, 2018

Area of Science:

  • Environmental Chemistry
  • Coal Science
  • Organic Geochemistry

Background:

  • Thiophenic sulfur compounds are persistent environmental pollutants and carcinogens released during coal conversion.
  • Understanding their formation is crucial for controlling emissions and promoting clean coal utilization.

Purpose of the Study:

  • To investigate the release behavior and formation mechanisms of thiophenic sulfur compounds during coal pyrolysis.
  • To determine the impact of operational conditions and coal properties on thiophenic sulfur compound generation.

Main Methods:

  • Pyrolysis of various coal samples using a CDS-5250 pyrolyzer.
  • In situ analysis of thiophenic sulfur compounds using Focus GC-DSQII.
  • Investigation across a range of temperatures (200-1300°C) and heating rates (6-14°C/ms and 6-14°C/s).

Main Results:

  • Quantified levels of benzothiophene and dibenzothiophene released during pyrolysis.
  • Established correlations between coal organic sulfur content and the total release of these compounds.
  • Demonstrated the influence of temperature and heating rate on the yield and speciation of thiophenic sulfur compounds.

Conclusions:

  • Coal pyrolysis conditions significantly affect the formation and release of thiophenic sulfur compounds.
  • Organic sulfur content in coal is a key factor in the generation of benzothiophene and dibenzothiophene.
  • Results provide insights for controlling thiophenic sulfur emissions in clean coal technologies.