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Preparation of Amines: Alkylation of Ammonia and Amines01:30

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Alkylation is one of the methods used to prepare amines. Direct alkylation of ammonia or a primary amine with an alkyl halide gives polyalkylated amines along with a quaternary ammonium salt through successive SN2 reactions. This process of making the quaternary salt through the direct alkylation method is called exhaustive alkylation.
Each alkylation step makes the nitrogen center more nucleophilic, which triggers successive alkylations until a quaternary ammonium salt is formed. Considering...
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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Adsorption of Gases on Solids01:28

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Adsorption is a process where molecules, known as the adsorbates, accumulate on a surface, which is referred to as the adsorbent or substrate. Occurring at the solid-gas interface, this phenomenon is crucial in various scientific and industrial contexts. The reverse of adsorption is desorption.Two types of adsorptions exist: physical (physisorption) and chemical (chemisorption). Physisorption involves gas molecules held to the solid's surface by relatively weak intermolecular van der Waals...
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2° Amines to N-Nitrosamines: Reaction with NaNO201:20

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Secondary amines react with nitrous acid to form N-nitrosamines, as depicted in Figure 1. Nitrous acid, a weak and unstable acid, is formed in situ from an aqueous solution of sodium nitrite and strong acids, such as hydrochloric acid or sulfuric acid, in cold conditions. In the presence of an acid, the nitrous acid gets protonated. The subsequent loss of water results in the formation of the electrophile known as nitrosonium ion.
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Amines to Sulfonamides: The Hinsberg Test01:23

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The Hinsberg test is a method to identify primary, secondary and tertiary amines, named after its pioneer, Oscar Hinsberg. Here, amines are treated with benzenesulfonyl chloride, also known as the Hinsberg reagent, in the presence of an excess of aqueous base, followed by acidification. Based on the nature of the amines, different changes are observed.
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Preparation of 1° Amines: Azide Synthesis01:22

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Direct alkylation of ammonia produces polyalkylated amines, along with a quaternary ammonium salt. To exclusively prepare primary amines, the azide synthesis method can be used.
Azide ions act as good nucleophiles and react with unhindered alkyl halides to form alkyl azides. Alkyl azides do not participate in further nucleophilic substitution reactions, thereby eliminating the chances of polyalkylated products. Alkyl azides are reduced by hydride-based reducing agents, like lithium aluminum...
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Supported polytertiary amines: highly efficient and selective SO2 adsorbents.

Ritesh Tailor1, Mohamed Abboud, Abdelhamid Sayari

  • 1Department of Chemistry, Centre for Catalysis Research and Innovation (CCRI), University of Ottawa , Ottawa, Ontario, Canada K1N 6N5.

Environmental Science & Technology
|January 21, 2014
PubMed
Summary
This summary is machine-generated.

Modified polyamines on nanoporous supports efficiently remove sulfur dioxide (SO2). The PME support demonstrated superior SO2 adsorption capacity, enhanced by humidity but reduced by temperature and polyamine evaporation.

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Chemical Engineering

Background:

  • Selective sulfur dioxide (SO2) removal is crucial for environmental protection and industrial processes.
  • Developing efficient adsorbents for SO2 capture remains a significant challenge.
  • Polyamine-based materials offer potential for SO2 adsorption due to their amine functionalities.

Purpose of the Study:

  • To develop and evaluate modified polyamines, including poly(propyleneimine) dendrimers (G2, G3) and polyethyleneimine (PEI), for selective SO2 removal.
  • To investigate the performance of these modified polyamines when supported on nanoporous materials (SBA-15PL and PME).
  • To understand the influence of temperature, humidity, and regeneration cycles on SO2 adsorption capacity.

Main Methods:

  • N-alkylation was used to convert primary and secondary amines to tertiary amines in polyamines, confirmed by FTIR and NMR.
  • Modified polyamines were impregnated onto SBA-15PL silica and pore-expanded MCM-41 (PME) supports.
  • SO2 adsorption capacity was measured at 23 °C with 0.1% SO2/N2, and the effects of temperature and humidity were investigated.

Main Results:

  • PME-supported modified PEI and G3 exhibited significantly higher SO2 adsorption capacities (4.68 and 4.34 mmol/g, respectively) compared to SBA-15PL supports.
  • Adsorption capacity decreased with increasing temperature, indicating an exothermic process.
  • Humidity dramatically enhanced SO2 adsorption, while consecutive regeneration cycles led to capacity decrease due to polyamine evaporation, not deactivation.

Conclusions:

  • Modified polyamines, particularly when supported on PME, are effective for selective SO2 capture.
  • The PME support enhances SO2 adsorption performance.
  • Polyamines form complexation adducts with SO2, and material stability during regeneration is critical for long-term application.