878027-73-7Relevant academic research and scientific papers
Corrosion behaviour of mild steel in 1-alkyl-3-methylimidazolium tricyanomethanide ionic liquids for CO2 capture applications
Molchan, Igor S.,Thompson, George E.,Lindsay, Robert,Skeldon, Peter,Likodimos, Vlassis,Romanos, George Em.,Falaras, Polycarpos,Adamova, Gabriela,Iliev, Boyan,Schubert, Thomas J. S.
, p. 5300 - 5311 (2014)
The corrosion behaviour of mild steel (MS) was systematically investigated as a function of the alkyl chain length in the cation of 1-alkyl-3- methylimidazolium tricyanomethanide ([Cnmim]TCM, n = 2, 4, 6 and 8) ionic liquids (ILs) with respect to their potential application as a structural material and solvents for CO2 capture plants respectively. The surface of MS was examined by scanning electron microscopy, energy dispersive X-ray spectroscopy and micro-Raman mapping before and after immersion testing at temperatures of 70 and 80°C for durations varying from 1 hour to 10 days. Corrosion initiates at the sites of MnS inclusions on the surface of MS, resulting in the formation of cavities due to the MnS dissolution, which may be surrounded by corrosion products containing magnetite (Fe3O 4) and maghemite (γ-Fe2O3). The amount of the corrosion products generated around the inclusion sites decreased with the increase of the cation alkyl chain length, following the order [C 2mim]TCM > [C4mim]TCM > [C6mim]TCM ≈ [C8mim]TCM. This was attributed to the corrosion inhibition effect of the ILs through adsorption on the metal surface and blocking active sites, with the inhibition efficiency increasing with the alkyl chain length. The underlying mechanism was associated with corrosion processes at active sites on the MS surface, such as sulphide inclusions, in the presence of residual water and oxygen in the IL. It was shown that increase of the water content in the ILs to about 50000 ppm resulted in faster dissolution of the MnS inclusions. Finally, it was demonstrated that removal of oxygen from the IL significantly reduced the corrosion rate.
Controlling the reactions of 1-bromogalactose acetate in methanol using ionic liquids as co-solvents
Gilbert, Alyssa,Haines, Ronald S.,Harper, Jason B.
supporting information, p. 5442 - 5452 (2020/09/09)
The reactions of an acetobromogalactose in mixtures of methanol and one of seven different ionic liquids with varying constituent ions were studied. In general, small amounts of ionic liquid in the reaction mixture led to increases in the rate constant compared to methanol, whilst large amounts of ionic liquid led to decreases in the rate constant; this outcome differs significantly from previous reactions proceeding through this mechansim. Temperature dependent kinetic studies indicated that the dominant interaction driving these changes was between the ionic liquid and the transition state of the process. Through considering solvent parameters of ionic liquids, a relationship was found between the changes in the rate constant and both the hydrogen bond accepting ability and polarisability of the solvent, indicating that the interactions affecting reaction outcome are both specific and non-specific in nature; once more, these interactions were different to those observed in previous similar reactions. By changing the amount of ionic liquid in the reaction mixture, additional products not seen in the molecular solvent case were observed, the ratios of which are dependent on the anion of the ionic liquid and the proportion of ionic liquid in the reaction mixture. This demonstrates the importance of considering solvent effects on both the rate and product determining steps and the potential application of such changes is discussed.
NEW COMPOUNDS II
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Page/Page column 10, (2010/10/20)
Compounds of formula I, wherein Y = H, -OH, halo, -OC1-6alkyl, -C1-6alkyl, the two latter optionally substituted with halo, -CN, -OH, -CF3, -NH2; Rl = -C3-6cycloaUcyl, heterocycloalkyl, aryl, alkylaryl, heteroaryl, -C3-6-alkyl, optionally substituted with halo, -CN, -OH, -CF3, -OCF3, -NH2, -CONH2; M = -C(O)-, -C(H2)-, -CH(OR3)-, -N(Ra)-, -S(O)r-, heteroaryl and a bond; wherein Ra = H or C1-6alkyl and r = 0, 1 or 2; R2 = H, halo, -CN, or D = -C1-6alkyl, C3-6cycloalkyl, heterocycloalkyl, -N(CH3)2, aryl, alkylaryl, heteroaryl, and heterocyclic groups; where D is optionally substituted with G = halo, -NO2, -CN, -OH, -CF3, -OCF3, -NH2, -CONH2, -COOH, aryl, heteroaryl, heterocyclic groups, -C1-6alkyl, -C1-6alkoxy, heterocycloalkyl, and C1-6alkylcarboxylate; where D may be connected to G by L = -C(O)-, -S-, or -S(O2)-; and G may be further substituted with substituents selected from halo, -NO2, -CN, -OH, -CH3, -OCH3, -CF3, -OCF3, -NH2, -CONH2, -COOH, C1-6alkylcarboxylate; and R3 = -OH or C1-6alkoxy.
