Functionalization of saturated hydrocarbons by aprotic superacids

1997 ◽  
Vol 46 (3) ◽  
pp. 491-495 ◽  
Author(s):  
I. S. Akhrem ◽  
I. M. Churilova ◽  
S. V. Vitt ◽  
A. V. Orlinkov ◽  
M. E. Vol'pin
Keyword(s):  
Saturated Hydrocarbons ◽  
Aprotic Superacids

ChemInform Abstract: Functionalization of Saturated Hydrocarbons in Aprotic Superacids. Part 1. Ionic Bromination of Alkanes and Cycloalkanes.

ChemInform ◽  
1990 ◽  
Vol 21 (18) ◽  
Author(s):  
I. S. AKHREM ◽  
A. V. ORLINKOV ◽  
S. V. VITT ◽  
L. V. AFANAS'EVA ◽  
M. E. VOL'PIN
Keyword(s):  
Saturated Hydrocarbons ◽  
Aprotic Superacids ◽  
Ionic Bromination

Liquid Crystal Trimers Incorporating Saturated Isosteres of Benzene and Exhibiting Modulated Nematic Phases

2019 ◽  
Author(s):  
Adam Al-Janabi ◽  
Richard Mandle
Keyword(s):  
Liquid Crystal ◽  
Helical Structure ◽  
Molecular Shape ◽  
Saturated Hydrocarbons ◽  
Fluid System ◽  
Structural Requirement ◽  
Disubstituted Benzene ◽  
Bona Fide ◽  
Nematic Phases ◽  
Bend Angles

<p>The nematic twist-bend (N<sub>TB</sub>) liquid crystal phase possesses a local helical structure with a pitch length of a few nanometres and is the first example of spontaneous symmetry breaking in a fluid system. All known examples of the N­<sub>TB­</sub> phase occur in materials whose constituent mesogenic units are aromatic hydrocarbons. It is not clear if this is due to synthetic convenience or a <i>bona fide</i> structural requirement for a material to exhibit this phase of matter. In this work we demonstrate that materials consisting largely of saturated hydrocarbons could also give rise to this mesophase. Furthermore, replacement of 1,4-disubstituted benzene with <i>trans</i> 1,4-cyclohexane or even 1,4-cubane does not especially alter the transition temperatures of the resulting material nor does it appear to impact upon the heliconical tilt angle, suggesting the local structure of the phase is unperturbed. Calculating the probability distribution of bend angles reveals that the choice of isosteric group has little impact on the overall molecular shape, demonstrating the shape-driven nature of the N<sub>TB</sub> phase. </p>

scholarly journals Production of Fuels and Chemicals from a CO2/H2 Mixture

Reactions ◽  
2020 ◽  
Vol 1 (2) ◽  
pp. 130-146
Author(s):  
Yali Yao ◽  
Baraka Celestin Sempuga ◽  
Xinying Liu ◽  
Diane Hildebrandt
Keyword(s):  
Co2 Hydrogenation ◽  
Water Gas Shift ◽  
Liquid Fuels ◽  
Saturated Hydrocarbons ◽  
Reverse Water Gas Shift ◽  
Cu Catalyst ◽  
In Series ◽  
Fuels And Chemicals ◽  
Water Gas ◽  
Aspen Simulation

In order to explore co-production alternatives, a once-through process for CO2 hydrogenation to chemicals and liquid fuels was investigated experimentally. In this approach, two different catalysts were considered; the first was a Cu-based catalyst that hydrogenates CO2 to methanol and CO and the second a Fisher–Tropsch (FT) Co-based catalyst. The two catalysts were loaded into different reactors and were initially operated separately. The experimental results show that: (1) the Cu catalyst was very active in both the methanol synthesis and reverse-water gas shift (R-WGS) reactions and these two reactions were restricted by thermodynamic equilibrium; this was also supported by an Aspen plus simulation of an (equilibrium) Gibbs reactor. The Aspen simulation results also indicated that the reactor can be operated adiabatically under certain conditions, given that the methanol reaction is exothermic and R-WGS is endothermic. (2) the FT catalyst produced mainly CH4 and short chain saturated hydrocarbons when the feed was CO2/H2. When the two reactors were coupled in series and the presence of CO in the tail gas from the first reactor (loaded with Cu catalyst) significantly improves the FT product selectivity toward higher carbon hydrocarbons in the second reactor compared to the standalone FT reactor with only CO2/H2 in the feed.

Characteristics in oxidative degradation by ozone for saturated hydrocarbons in soil contaminated with diesel fuel

Chemosphere ◽  
2007 ◽  
Vol 66 (5) ◽  
pp. 799-807 ◽  
Author(s):  
Do-Yun Yu ◽  
Namgoo Kang ◽  
Wookeun Bae ◽  
M. Katherine Banks
Keyword(s):  
Diesel Fuel ◽  
Oxidative Degradation ◽  
Saturated Hydrocarbons
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