179863-07-1Relevant academic research and scientific papers
Decision support towards agile eco-design of microreaction processes by accompanying (simplified) life cycle assessment
Huebschmann, Sabine,Kralisch, Dana,Loewe, Holger,Breuch, Denis,Petersen, Jan Hauke,Dietrich, Thomas,Scholz, Ralf
, p. 1694 - 1707 (2011)
Continuously running syntheses in microstructured reactors offers novel ways to intensify conventional chemical processes. An outstanding advantage of microreaction technology is the high surface-to-volume-ratio which enables intensive mixing phenomena as well as high mass and heat transfer rates. Thus, microstructured reactors may be a suitable means to improve multiphase reactions by increasing the interfacial area and the intensification of internal mixing. This improvement in reaction performances may lead to reduced environmental burdens of the process under consideration. The method of simplified life cycle assessment (SLCA) is a suitable tool to evaluate the environmental burdens caused by chemical processes. It has been applied already in research and development to identify the key parameters for a deliberate green process design of two biphasic reactions, the esterification of phenol and benzoyl chloride resulting in phenyl benzoate and the synthesis of one of the corresponding phase transfer catalysts, [BMIM]Cl. Further, SLCA is complemented by a simple cost estimation to investigate the main cost drivers relevant for possible industrial application of the syntheses investigated.
Oligomerisation of isobutene with silica supported ionic liquid catalysts
Feher, Csaba,Krivan, Eszter,Hancsok, Jen,Skoda-Foeldes, Rita
, p. 403 - 409 (2012)
Bronsted acidic ionic liquids, supported on silica gel, have been used effectively in oligomerisation of isobutene. The supported catalysts could be used several times without loss of activity or change in selectivity. The ratio of the products could be influenced by the proper choice of the ionic liquid component of the catalyst and the reaction temperature.
Catalytic hydrolysis of cellulose into furans in MnCl2-ionic liquid system
Tao, Furong,Song, Huanling,Yang, Jian,Chou, Lingjun
, p. 363 - 368 (2011)
Production of 5-hydroxymethylfurfural (HMF) and furfural from microcrystalline cellulose (MCC) was studied in 1-(4-sulfonic acid) butyl-3-methylimidazolium hydrogen sulfate (IL-1) with catalytic amount of MnCl2 under atmospheric pressure within 300 min at 150 °C, in which 88.62% of conversion was obtained. With the presence of a catalytic amount of MnCl2, HMF and furfural yields were up to 37% and 18%, respectively, and generated small amount of levulinic acid (LA) and the total reducing sugars (TRS). Dimer of furans compounds as the important by-products were analyzed through HPLC-MS; some small molecular substances, methane, ethane, CO, CO2 and H2, as gas products were detected using mass spectrometry analysis. Comparing with the previous reports, our catalytic system is simple, and it provides an effective route for the conversion of microcrystalline cellulose into biofuels and important platform chemicals.
Use of SO3H-functionalized halogenfree ionic liquid ([MIM(CH2)4SO3H] [HSO4]) as efficient promoter for the synthesis of structurally diverse spiroheterocycles
Kumar, Mahendra,Sharma, Kailash,Arya, Anand Kumar
, p. 4604 - 4608 (2012)
Structurally diverse spiroheterocycles with fused systems incorporating medicinally privileged systems have been synthesized by an efficient and convenient synthetic method involving four component domino reaction of 2-aminobenzothiazoles with isatin and cyclic β-diketones using SO 3H-functionlized halogenfree ionic liquid ([MIM(CH2) 4SO3H][HSO4]) in aqueous medium.
Direct hydroxylation of p-xylene to 2,5-xylenol with hydroxylamine in ionic liquids/molybdenum catalytic system
Zhang,Gao,Jin,Xue,Zhao,Wang,Wang
, p. 7527 - 7531 (2014)
Direct hydroxylation of p-xylene to 2,5-xylenol with hydroxylamine was carried out in an ionic liquids/molybdenum catalytic system. High 2,5-xylenol selectivity (80-98 %) can be achieved with good p-xylene conversion (5.9-9.9 %) in this catalytic system. The recycling experiments suggested the ionic liquids/molybdenum catalytic system was stable enough to be recycled for the hydroxylation reaction.
Revealing the Charge Transport Mechanism in Polymerized Ionic Liquids: Insight from High Pressure Conductivity Studies
Wojnarowska, Zaneta,Feng, Hongbo,Diaz, Mariana,Ortiz, Alfredo,Ortiz, Inmaculada,Knapik-Kowalczuk, Justyna,Vilas, Miguel,Verdía, Pedro,Tojo, Emilia,Saito, Tomonori,Stacy, Eric W.,Kang, Nam-Goo,Mays, Jimmy W.,Kruk, Danuta,Wlodarczyk, Patryk,Sokolov, Alexei P.,Bocharova, Vera,Paluch, Marian
, p. 8082 - 8092 (2017)
Polymerized ionic liquids (polyILs), composed mostly of organic ions covalently bonded to the polymer backbone and free counterions, are considered as ideal electrolytes for various electrochemical devices, including fuel cells, supercapacitors, and batteries. Despite large structural diversity of these systems, all of them reveal a universal but poorly understood feature: a charge transport faster than the segmental dynamics. To address this issue, we studied three novel polymer electrolyte membranes for fuel cells as well as four single-ion conductors, including highly conductive siloxane-based polyIL. Our ambient and high pressure studies revealed fundamental differences in the conducting properties of the examined systems. We demonstrate that the proposed methodology is a powerful tool to identify the charge transport mechanism in polyILs in general and thereby contribute to unraveling the microscopic nature of the decoupling phenomenon in these materials.
Anionic SO3H-functionalized ionic liquid: An efficient and recyclable catalyst for the Pechmann reaction of phenols with ethyl acetoacetate
Song, Dayong,Chen, Jing,Liang, Yong-Min
, p. 692 - 698 (2018)
This paper has reported an anionic SO3H-functionalized ionic liquid N-methylimidazolium sulfomethylsulfonate ([Hmim][HO3SCH2SO3]) for the synthesis of coumarins by Pechmann reaction. The [Hmim][HO3SCH2SO3] is easier to prepare by one-step neutralization reaction of N-methylimidazole with methanedisulfonic acid and show high catalytic performance for Pechmann reaction. Besides, the catalyst can simply be separated from the reaction mixture and recycled ten times without noticeable loss of activity.
Efficient synthesis of N-substituted pyrroles catalyzed by a novel an organic-inorganic hybrid solid acid catalyst
Gao, Lanchang,Bing, Liu,Zhang, Zehui,Kecheng, Huang,Xiaoyun, Hu,Deng, Kejian
, p. 26 - 31 (2013)
A novel organic-inorganic hybrid solid acid [MIMBS]3PW 12O40 has been successfully prepared. It showed high catalytic activity for N-substituted pyrroles through the cyclocondensation of primary amines with 1,4-dicarbonyl compounds. The solid acid catalyst is stable and can be easily recovered and reused without losing its activity in its efficiency. In addition, a plausible mechanism for the catalytic action of [MIMBS]3PW12O40 has been introduced.
CFacile biodiesel synthesis from esterification of free fatty acids catalyzed by SO3H-Functionalized Ionic Liquid
Zhou, Shuai,Liu, Lu,Wang, Bo,Xu, Feng,Sun, Runcang
, p. 240 - 244 (2013)
The esterifications of free fatty acids with methanol were efficiently accomplished over a SO3H-functionalized ionic liquid, 1-(4-sulphonic acid)butyl-3-methylimidazolium hydrogen sulphate ([BSMim]HSO4), which are commonly considered as both one of the typical synthetic routes and the representative pretreatment process for biodiesel production. Particularly, the maximum yield of methyl oleate was obtained in 99.9 %. Methyl oleate could be isolated through simple decantation from the biphasic system, which is attributed to the immiscibility of [BSMim]HSO4 with hydrophobic ester and the good stability and operability of ionic liquid were demonstrated by the six times reuses without dramatic decrease in methyl oleate yield.
Insights on the catalytic behaviour of sulfonic acid-functionalized ionic liquids (ILs) in transesterification reactions - voltammetric characterization of sulfonic task-specific ILs with bisulfate anions
Martini, María B.,Fernández, José L.,Adam, Claudia G.
, p. 2731 - 2741 (2021)
This work shows for the first time the link between the amount of free sulfuric acid (as detected by cyclic voltammetry) and the activity of sulfonic-acid-functionalized ionic liquids (ILs) as acid catalysts for a transesterification reaction, and demonstrates that sulfonic acid groups, while are not directly involved in the catalysis, release the free acid during the reaction. Two imidazolic ILs with bisulfate as the counterion and their corresponding task-specific ILs (TSILs) that resulted from the addition of a sulfonic acid group inside the imidazolic-base structure were studied. The outstanding catalytic activity at room temperature of the TSILs 1-(4-sulfonic acid)-butyl-3-methylimidazolium bisulfate ([bsmim]HSO4) and 1-(4-sulfonic acid)-butyl-imidazolium bisulfate ([bsHim]HSO4) for the transesterification ofp-nitrophenyl acetate with methanol was associated to the significant amounts of free sulfuric acid in equilibria with the ionic pairs. It was concluded that these TSILs function as reservoirs for releasing the free acid, which is the actual acid catalyst. In contrast, the corresponding non-sulfonic ILs supply very little amounts of free acid and consequently present low catalytic activities at room temperature, which in fact can be improved by increasing the reaction temperature up to 100 °C.
