Síntesis de una membrana con líquido iónico de tercera generación, su evaluación en separación de CO2 y su captura en un cultivo hidropónico

Mapping Intimacies ◽

10.24275/uama.6738.7471 ◽

2016 ◽

Author(s):

◽

Cinthia Erika Sánchez-Fuentes

Keyword(s):

Ionic Liquids ◽

Chemical Structure ◽

Research Work ◽

Added Value ◽

Amino Group ◽

Amino Groups ◽

X Ray ◽

Variable Volume ◽

Infrared Studies ◽

Volume Method

In the present research work, four membranes supported with ionic liquids (SILMs) were synthesized to be evaluated in the CO2 separation from the CO2/N2 mixture. As for the ionic liquids, two of them were functionalized with an amino group at the cationic part, 1-(2-aminoethyl)-3-methylimidazolium triflate ([AEMIm]Tf) and 1-(2-aminoethyl)-3-methylimidazolium tetrafluoroborate ([AEMIm]BF4), the third and fourth ionic liquids possessed the amino group at the anionic part, trioctylmethylammonium anthranilate ([TOMA]An) and triethylmethylammonium oleate ([TOMA]Ol). The chemical structure of the ionic liquids was confirmed by nuclear magnetic resonance (NMR) and Fourier transform infrared (FTIR) spectroscopies; the thermal properties were studied by thermogravimetric analysis (TGA) and density was measured with a pycnometer. The impregnation degree and distribution of the ionic liquids in an alumina tubular support were established by means of scanning electron microscopy coupled with energy dispersive X-ray spectroscopy (SEM-EDX). The transport properties of the gases were evaluated by the variable volume method using pure gases and their mixtures with a 50/50 volumetric ratio at 30 °C and 1, 2 and 3 bar. The SILM [TOMA]An showed the highest selectivity (70) and the best permselectivity balance, surpassing the limits in the Robeson plot. The SILMs with amino groups reacted with CO2 to obtain the carbamate chemical group. The thermal stability and infrared studies suggest that this group is stable even after the beginning of the decomposition process of the ionic liquid. In order to provide an added value to the use of CO2, a lettuce hydroponic greenhouse was enriched with this gas, observing an accelerated growing effect.

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Axially Chiral Bis(α-amino Acid)s and Their Deamino Analogues. Synthesis and Configurational Assignment

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc19980211 ◽

1998 ◽

Vol 63 (2) ◽

pp. 211-221 ◽

Cited By ~ 5

Author(s):

Miloš Tichý ◽

Luděk Ridvan ◽

Miloš Buděšínský ◽

Jiří Závada ◽

Jaroslav Podlaha ◽

...

Keyword(s):

Amino Acid ◽

Nmr Spectra ◽

Building Blocks ◽

X Ray Diffraction ◽

Amino Groups ◽

X Ray ◽

Configurational Assignment ◽

Symmetry Properties ◽

Axially Chiral ◽

Polymeric Structures

The axially chiral bis(α-amino acid)s cis-2 and trans-2 as possible building blocks for polymeric structures of novel type of helicity were prepared. Their configuration has been determined by NMR spectroscopy and, in the case of the trans-isomer, confirmed by single-crystal X-ray diffraction. Analogous pair of stereoisomeric diacids cis-3 and trans-3, devoid of the amino groups, was also prepared and their configuration assigned. The observed differences in the NMR spectra of cis- and trans-isomers of 2 and 3 are discussed from the viewpoint of their different symmetry properties.

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Combustion and gasification characteristics of low-temperature pyrolytic semi-coke prepared through atmosphere rich in CH4 and H2

Green Processing and Synthesis ◽

10.1515/gps-2021-0015 ◽

2021 ◽

Vol 10 (1) ◽

pp. 189-200

Author(s):

Yuan She ◽

Chong Zou ◽

Shiwei Liu ◽

Keng Wu ◽

Hao Wu ◽

...

Keyword(s):

Functional Groups ◽

Chemical Structure ◽

Nitrogen Adsorption ◽

Inhibitory Effect ◽

X Ray ◽

Coke Reactivity ◽

Reducing Gas ◽

Reactivity Indexes ◽

Infrared Spectrometer ◽

Reducing Gases

Abstract Thermoanalysis was used in this research to produce a comparative study on the combustion and gasification characteristics of semi-coke prepared under pyrolytic atmospheres rich in CH4 and H2 at different proportions. Distinctions of different semi-coke in terms of carbon chemical structure, functional groups, and micropore structure were examined. The results indicated that adding some reducing gases during pyrolysis could inhibit semi-coke reactivity, the inhibitory effect of the composite gas of H2 and CH4 was the most observable, and the effect of H2 was higher than that of CH4; moreover, increasing the proportion of reducing gas increased its inhibitory effect. X-ray diffractometer and Fourier-transform infrared spectrometer results indicated that adding reducing gases in the atmosphere elevated the disordering degree of carbon microcrystalline structures, boosted the removal of hydroxyl- and oxygen-containing functional groups, decreased the unsaturated side chains, and improved condensation degree of macromolecular networks. The nitrogen adsorption experiment revealed that the types of pore structure of semi-coke are mainly micropore and mesopore, and the influence of pyrolytic atmosphere on micropores was not of strong regularity but could inhibit mesopore development. Aromatic lamellar stack height of semi-coke, specific surface area of mesopore, and pore volume had a favorable linear correlation with semi-coke reactivity indexes.

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Study on the efficiency of multiple amino groups in ionic liquids on their sorbents performance for low-temperature CO2 capture

Chemical Engineering Research and Design ◽

10.1016/j.cherd.2021.01.016 ◽

2021 ◽

Vol 167 ◽

pp. 198-206

Author(s):

Zhoulan Huang ◽

Davood Karami ◽

Nader Mahinpey

Keyword(s):

Ionic Liquids ◽

Low Temperature ◽

Co2 Capture ◽

Amino Groups

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Thermal, Viscoelastic, Mechanical and Wear Behaviour of Nanoparticle Filled Polytetrafluoroethylene: A Comparison

Polymers ◽

10.3390/polym12091940 ◽

2020 ◽

Vol 12 (9) ◽

pp. 1940 ◽

Cited By ~ 1

Author(s):

Levente Ferenc Tóth ◽

Patrick De Baets ◽

Gábor Szebényi

Keyword(s):

Room Temperature ◽

Filler Content ◽

Research Work ◽

Tensile Modulus ◽

Al2o3 Content ◽

Wear Behaviour ◽

X Ray ◽

Mechanical Stirring ◽

Wear Analysis ◽

Sintering Method

In this research work, unfilled and mono-filled polytetrafluoroethylene (PTFE) materials were developed and characterised by physical, thermal, viscoelastic, mechanical, and wear analysis. The applied fillers were graphene, alumina (Al2O3), boehmite alumina (BA80), and hydrotalcite (MG70) in 0.25/1/4/8 and 16 wt % filler content. All samples were produced by room temperature pressing–free sintering method. All of the fillers were blended with PTFE by intensive dry mechanical stirring; the efficiency of the blending was analysed by Energy-dispersive X-ray spectroscopy (EDS) method. Compared to neat PTFE, graphene in 4/8/16 wt % improved the thermal conductivity by ~29%/~84%/~157%, respectively. All fillers increased the storage, shear and tensile modulus and decreased the ductility. PTFE with 4 wt % Al2O3 content reached the lowest wear rate; the reduction was more than two orders of magnitude compared to the neat PTFE.

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Investigation of the effect of ring size on the product distribution for the Schiff base reaction of 2-acetylcycloalkanones with diamino alkanes

Canadian Journal of Chemistry ◽

10.1139/v95-004 ◽

1995 ◽

Vol 73 (1) ◽

pp. 16-21 ◽

Cited By ~ 9

Author(s):

Raul G. Enriquez ◽

Juan M. Fernandez-G ◽

Ismael Leon ◽

William F. Reynolds ◽

Ji.-Ping Yang ◽

...

Keyword(s):

Schiff Base ◽

Condensation Reaction ◽

2D Nmr ◽

Product Distribution ◽

Major Product ◽

Ring Size ◽

Amino Group ◽

Amino Groups ◽

Full-field X-ray diffraction microscopy using polymeric compound refractive lenses

Journal of Applied Crystallography ◽

10.1107/s1600576714021256 ◽

2014 ◽

Vol 47 (6) ◽

pp. 1882-1888 ◽

Cited By ~ 11

Author(s):

J. Hilhorst ◽

F. Marschall ◽

T. N. Tran Thi ◽

A. Last ◽

T. U. Schülli

Keyword(s):

Imaging Techniques ◽

Light And Electron Microscopy ◽

Added Value ◽

Acquisition Time ◽

Imaging Method ◽

X Ray Diffraction ◽

Polymeric Compound ◽

Full Field ◽

X Ray ◽

Diffraction Imaging

Diffraction imaging is the science of imaging samples under diffraction conditions. Diffraction imaging techniques are well established in visible light and electron microscopy, and have also been widely employed in X-ray science in the form of X-ray topography. Over the past two decades, interest in X-ray diffraction imaging has taken flight and resulted in a wide variety of methods. This article discusses a new full-field imaging method, which uses polymer compound refractive lenses as a microscope objective to capture a diffracted X-ray beam coming from a large illuminated area on a sample. This produces an image of the diffracting parts of the sample on a camera. It is shown that this technique has added value in the field, owing to its high imaging speed, while being competitive in resolution and level of detail of obtained information. Using a model sample, it is shown that lattice tilts and strain in single crystals can be resolved simultaneously down to 10−3° and Δa/a= 10−5, respectively, with submicrometre resolution over an area of 100 × 100 µm and a total image acquisition time of less than 60 s.

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Upgrading pyrolytic residue from waste tires to commercial carbon black

Waste Management & Research ◽

10.1177/0734242x18764292 ◽

2018 ◽

Vol 36 (5) ◽

pp. 436-444 ◽

Cited By ~ 18

Author(s):

Xue Zhang ◽

Hengxiang Li ◽

Qing Cao ◽

Li’e Jin ◽

Fumeng Wang

Keyword(s):

Carbon Black ◽

Value Added ◽

Pyrolytic Carbon ◽

Ultrasonic Waves ◽

Added Value ◽

Infrared Spectrometry ◽

Raman Spectrometry ◽

X Ray ◽

Waste Tires ◽

Commercial Carbon

The managing and recycling of waste tires has become a worldwide environmental challenge. Among the different disposal methods for waste tires, pyrolysis is regarded as a promising route. How to effectively enhance the added value of pyrolytic residue (PR) from waste tires is a matter of great concern. In this study, the PRs were treated with hydrochloric and hydrofluoric acids in turn under ultrasonic waves. The removal efficiency for the ash and sulfur was investigated. The pyrolytic carbon black (PCB) obtained after treating PR with acids was analyzed by X-ray fluorescence spectrophotometry, Fourier transform infrared spectrometry, X-ray diffractometry, laser Raman spectrometry, scanning electron microscopy, thermogravimetric (TG) analysis, and physisorption apparatus. The properties of PCB were compared with those of commercial carbon black (CCB) N326 and N339. Results showed PRs from waste tires were mainly composed of carbon, sulfur, and ash. The carbon in PCB was mainly from the CCB added during tire manufacture rather than from the pyrolysis of pure rubbers. The removal percentages for the ash and sulfur of PR are 98.33% (from 13.98 wt % down to 0.24 wt %) and 70.16% (from 1.81 wt % down to 0.54 wt %), respectively, in the entire process. The ash was mainly composed of metal oxides, sulfides, and silica. The surface properties, porosity, and morphology of the PCB were all close to those of N326. Therefore, PCB will be a potential alternative of N326 and reused in tire manufacture. This route successfully upgrades PR from waste tires to the high value-added CCB and greatly increases the overall efficiency of the waste tire pyrolysis industry.

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3,3′-N,N′-Bis(amino)-2,2′-bipyridine — An unusually methylation-resistant amine

Canadian Journal of Chemistry ◽

10.1139/v11-066 ◽

2011 ◽

Vol 89 (8) ◽

pp. 971-977

Author(s):

Danielle M. Chisholm ◽

Robert McDonald ◽

J. Scott McIndoe

Keyword(s):

Crystal Structure ◽

Hydrogen Bonds ◽

Complex Mixtures ◽

Amino Groups ◽

Intramolecular Hydrogen Bonds ◽

X Ray ◽

Intramolecular Hydrogen

Methylation of aromatic amino groups is usually straightforward, but the formation of two intramolecular hydrogen bonds in 3,3′-N,N′-bis(amino)-2,2′-bipyridine and (or) the potential for ring methylation prevents the clean tetramethylation of this molecule. Numerous attempts to make 3,3′-N,N′-bis(dimethylamino)-2,2′-bipyridine produced only complex mixtures of variously methylated products, and the only isolated molecule was 3,3′-N,N′-bis(methylamino)-2,2′-bipyridine, for which an X-ray crystal structure was obtained.

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