Quantitative analysis of N-methyl-2-pyrrolidinone in coal extracts by TGA-FTIR

Cai, M. F.; Smart, Ronald B.

doi:10.1021/ef00037a010

Cited by 28 publications

(18 citation statements)

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“…This mass loss is attributed to the loss of NMP during the thermal process. It has been shown that NMP polymerizes when used at elevated temperatures in air [31,32]. This polymerized NMP has been revealed to lose mass in a similar range as that reported in the TGA curves ( Figure 3) in a nitrogen environment [33].…”

Section: % Remaining Of Pristine Cnt −supporting

confidence: 65%

A Simple Two-Step Process for Producing Strong and Aligned Carbon Nanotube-Polymer Composites

Gbordzoe

Adusei

Chauhan

et al. 2019

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In this paper, we present the results of a study related to fabrication of polymer-aligned carbon nanotube (CNT) composites made with different thermoplastic polymers. These composites have been manufactured by employing a simple two-step process using the internal resistive heating approach. The resulting composites have shown improved tensile strength, load, and elastic modulus compared to pristine CNT sheets. Poly (methyl methacrylate) (PMMA)-CNT, UltemTM-CNT and thermoplastic polyurethane (TPU)-CNT composites showed an increase in tensile strength by as much as 41%, 77% and 86% respectively over pristine CNT sheets. The improvement in tensile strength is the result of a good adhesion achieved between the aligned CNTs and polymer as observed with transmission electron microscopy (TEM) and scanning electron microscopy (SEM).

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Section: % Remaining Of Pristine Cnt −supporting

confidence: 65%

A Simple Two-Step Process for Producing Strong and Aligned Carbon Nanotube-Polymer Composites

Gbordzoe

Adusei

Chauhan

et al. 2019

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“…43 NMP has also been suggested to causes cleavage of carbon–oxygen bonds in coals when used under refluxing conditions. 39 In these reactions, a hydroperoxide is thought to be an intermediate in the reaction of NMP and oxygen-yielding N -methylsuccinimide. 40 In our experiments, pure NMP changes color from clear to brown when refluxed under atmospheric oxygen.…”

Section: Resultsmentioning

confidence: 99%

A One-Step, Solvothermal Reduction Method for Producing Reduced Graphene Oxide Dispersions in Organic Solvents

et al. 2010

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Refluxing graphene oxide (GO) in N-methyl-2-pyrrolidinone (NMP) results in deoxygenation and reduction to yield a stable colloidal dispersion. The solvothermal reduction is accompanied by a color change from light brown to black. Atomic force microscopy (AFM) and scanning electron microscopy (SEM) images of the product confirm the presence of single sheets of the solvothermally reduced graphene oxide (SRGO). X-ray photoelectron spectroscopy (XPS) of SRGO indicates a significant increase in intensity of the C=C bond character, while the oxygen content decreases markedly after the reduction is complete. X-ray diffraction analysis of SRGO shows a single broad peak at 26.24° 2θ (3.4 Å), confirming the presence of graphitic stacking of reduced sheets. SRGO sheets are redispersible in a variety of organic solvents, which may hold promise as an acceptor material for bulk heterojunction photovoltaic cells, or electromagnetic interference shielding applications.

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“…4. The broad absorption band at 3440 and 3454 cm -1 in the case of both coal samples and frequencies at 3429, 3435, 1655 and 1661 cm -1 in pure NMP and permeate, were observed due to N-H stretching vibration (Cai and Smart 1993). Two stronger bands 2933 and 2935 cm -1 were observed in pure NMP due to CH 3 -CH 2 vibrations.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir) Analysismentioning

confidence: 88%

Fabrication of cost effective iron ore slime ceramic membrane for the recovery of organic solvent used in coke production

Singh

Meena

Golder

et al. 2016

Int J Coal Sci Technol

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Improvement of coking properties of sub-bituminous coal (A) and bituminous coal (B) was done using blended organic solvents, namely, n-methyl-2-pyrrolidinone (NMP) and ethylenediamine (EDA). Various solvent blends were employed for the coal extraction under the total reflux condition. A low-cost ceramic membrane was fabricated using industrial waste iron ore slime of M/s TATA steel R&D, Jamshedpur (India) to separate out the dissolved coking fraction from the solvent-coal mixture. Membrane separations were carried out in a batch cell, and around 75 % recovered NMP was reused. The fractionated coal properties were determined using proximate and ultimate analyses. In the case of bituminous coal, the ash and sulfur contents were decreased by 99.3 % and 79.2 %, respectively, whereas, the carbon content was increased by 23.9 % in the separated coal fraction. Three different cleaning agents, namely deionized water, sodium dodecyl sulphate and NMP were used to regain the original membrane permeability for the reusing.

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Quantitative analysis of N-methyl-2-pyrrolidinone in coal extracts by TGA-FTIR

Cited by 28 publications

References 0 publications

A Simple Two-Step Process for Producing Strong and Aligned Carbon Nanotube-Polymer Composites

A Simple Two-Step Process for Producing Strong and Aligned Carbon Nanotube-Polymer Composites

A One-Step, Solvothermal Reduction Method for Producing Reduced Graphene Oxide Dispersions in Organic Solvents

Fabrication of cost effective iron ore slime ceramic membrane for the recovery of organic solvent used in coke production

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