CAS Lanzhou Institute of Chemical Physics

Lanzhou, China

CAS Lanzhou Institute of Chemical Physics

Lanzhou, China
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Patent
Suzhou OST Advanced Materials Co. and CAS Lanzhou Institute of Chemical Physics | Date: 2015-04-01

The invention relates to a reaction system and process for continuously preparing polymethoxy dimethyl ether (DMM_(3-8)) by a continuous acetalization reaction between an aqueous formaldehyde solution or paraformaldehyde and methanol in the presence of a functionalized acidic ionic liquid as a catalyst. The reaction system of the invention preferably comprises a formaldehyde-concentrating unit, a vacuum-drying unit, an acetalization reaction unit, a product-separating unit and a catalyst-regenerating unit. The process of the invention uses aqueous formaldehyde solution as an initial raw material, which is concentrated in the formaldehyde-concentrating unit to a concentrated formaldehyde of 5080 wt.%, and vacuum-dried to paraformaldehyde, or uses paraformaldehyde as raw material directly, then obtains DMM_(3-8) by an acetalization reaction. The raw materials of the reaction used in the invention are cheap and available easily, and the utilization rate of formaldehyde is high; an efficient separation between the catalyst and product, as well as the reuse of the catalyst and raw materials, are realized by a separation mode of combining extraction and rectification together.


Patent
CAS Lanzhou Institute of Chemical Physics and Suzhou OST Advanced Materials Co. | Date: 2014-03-18

The invention relates to a reaction system and process for continuously preparing polymethoxy dimethyl ether (DMM_(3-8)) by a continuous acetalization reaction between an aqueous formaldehyde solution or paraformaldehyde and methanol in the presence of a functionalized acidic ionic liquid as a catalyst. The reaction system of the invention preferably comprises a formaldehyde-concentrating unit, a vacuum-drying unit, an acetalization reaction unit, a product-separating unit and a catalyst-regenerating unit. The process of the invention uses aqueous formaldehyde solution as an initial raw material, which is concentrated in the formaldehyde-concentrating unit to a concentrated formaldehyde of 5080 wt. %, and vacuum-dried to paraformaldehyde, or uses paraformaldehyde as raw material directly, then obtains DMM_(3-8 )by an acetalization reaction. The raw materials of the reaction used in the invention are cheap and available easily, and the utilization rate of formaldehyde is high; an efficient separation between the catalyst and product, as well as the reuse of the catalyst and raw materials, are realized by a separation mode of combining extraction and rectification together.


Patent
CAS Lanzhou Institute of Chemical Physics and Suzhou OST Advanced Materials Co. | Date: 2015-08-12

The present invention relates to a process for catalytic synthesis of a low-carbon polyether-based compound by using an acidic ionic liquid as the catalyst. The low-carbon polyether-based compound is prepared from an acetal compound and paraformaldehyde under the following conditions: reaction temperature of 70C-200C and reaction pressure of 0.2MPa-6MPa. The process is mainly characterized by avoiding the use of concentrated sulfuric acid or trifluoromethanesulfonic acid, which has strong corrosivity and will pollute the environment, as the catalyst. The ionic liquid being used has no corrosivity and will not pollute the environment, and has high selectivity for the low-carbon polyether-based compound product. Outstanding characteristics of the process include: the reaction system is free of water, the product can be very easily separated from the catalyst, the product can be widely applied, the ionic liquid can be used repeatedly, and therefore the outlook of the use of the process on industrial scale is very good.


Liu C.,Wuhan University | Zhang H.,Wuhan University | Shi W.,Wuhan University | Lei A.,Wuhan University | Lei A.,CAS Lanzhou Institute of Chemical Physics
Chemical Reviews | Year: 2011

Recent progress in the oxidative cross-coupling between two nucleophiles (Nu1/Nu2) is reported. Lipshutz and co-workers reported the first oxidative crosscoupling reaction between two different aryl metal reagents to form unsymmetrical biaryls in the presence of stoichiometric amounts of CuCN with oxygen as the oxidant at low temperature. One catalytic procedure based on the oxidative coupling between two alkyl metal reagents was demonstrated by Lei and Zhang, in which the homocouplings of benzylic zinc reagents were investigated in the presence of a palladium catalyst. The first report about the oxidative cross-coupling of terminal alkynes with alkanes was demonstrated by Miura and co-workers, in which the sp3 carbon of alkane was adjacent to a tertiary amine. Zhang and co-workers developed a one-pot approach to C3-position acetoxylated biindolyls realized via palladium catalysis by the use of AgOAc under oxygen atmosphere as oxidants.


Yang L.,CAS Lanzhou Institute of Chemical Physics | Huang H.,CAS Lanzhou Institute of Chemical Physics
Chemical Reviews | Year: 2015

The scientific review summarizes the developments in transition-metal-catalyzed direct addition of unactivated C(sp2)-H and C(sp3)-H bonds to polar C-C, C-O, and C-N multiple bonds in polar molecules. The scientific review specifically emphasizes on the transformations developed through the two mechanisms. Transition-metal-catalyzed addition of C(sp2)-H bonds to C-C double bonds via C-H bond activation has also been demonstrated to be a simple and atom-economical protocol for the construction of C-C bond frameworks. Various C(sp2)-H bonds.


Gu Y.,Huazhong University of Science and Technology | Gu Y.,CAS Lanzhou Institute of Chemical Physics
Green Chemistry | Year: 2012

Simple and green synthetic procedures constitute an important goal in organic synthesis. The combination of multicomponent reactions (MCRs) and unconventional solvents has become a new research direction, which enables simultaneous growth of both MCRs and green solvents toward ideal organic synthesis. This review summarizes recent results of MCRs obtained in unconventional media including water, ionic liquids, polyethylene glycol and bio-based solvents. © 2012 The Royal Society of Chemistry.


Ye Q.,CAS Lanzhou Institute of Chemical Physics | Zhou F.,CAS Lanzhou Institute of Chemical Physics | Liu W.,CAS Lanzhou Institute of Chemical Physics
Chemical Society Reviews | Year: 2011

The attachment strategy based on catecholic chemistry has been arousing renewed interest since the work on polymerized catecholic amine (polydopamine) (Messersmith et al., Science, 2007, 318, 426) was published. Catechols and their derived compounds can self-assemble on various inorganic and organic materials, including noble metals, metals, metal oxides, mica, silica, ceramics and even polymers. It opens a new route to the modification of various substrates and the preparation of functional composite materials by simple chemistry. However, there is still not a full review so far about the attachment chemistry despite the dramatically increasing number of publications. This critical review describes the state-of-the-art research in the area: the design and synthesis of catecholic molecules, their adsorption mechanisms and the stability of assemblies in solution, and their applications etc. Some perspectives on future development are raised (195 references). © 2011 The Royal Society of Chemistry.


Gu Y.,Huazhong University of Science and Technology | Gu Y.,CAS Lanzhou Institute of Chemical Physics | Jerome F.,CNRS Poitiers Institute of Chemistry: Materials and Natural Resources
Chemical Society Reviews | Year: 2013

Biomass and waste exhibit great potential for replacing fossil resources in the production of chemicals. The search for alternative reaction media to replace petroleum-based solvents commonly used in chemical processes is an important objective of significant environmental consequence. Recently, bio-based derivatives have been either used entirely as green solvents or utilized as pivotal ingredients for the production of innovative solvents potentially less toxic and more bio-compatible. This review presents the background and classification of these new media and highlights recent advances in their use in various areas including organic synthesis, catalysis, biotransformation and separation. The greenness, advantages and limitations of these solvents are also discussed. © 2013 The Royal Society of Chemistry.


Wang Q.,CAS Lanzhou Institute of Chemical Physics
Journal of chromatography. A | Year: 2010

An ionic liquid-based single-drop microextraction (IL-SDME) procedure using IL as an extractant on-line coupled to capillary electrophoresis (CE) is proposed. The method is capable of quantifying trace amounts of phenols in environmental water samples. For the SDME of three phenols, a 2.40 nL IL microdrop was exposed for 10 min to the aqueous sample and then was directly injected into the capillary column for analysis. Extraction parameters such as the extraction time, the IL single-drop volume, pH of the sample solution, ionic strength, volume of the sample solution and the extraction temperature were systematically investigated. Detection limits to three phenols were less than 0.05 microg mL(-1), and their calibration curves were all linear (R(2) > or = 0.9994) in the range from 0.05 to 50 microg mL(-1). And enrichment factors for three phenols were 156, 107 and 257 without agitation, respectively. This method was then utilized to analyze two real environmental samples from Yellow River and tap water, obtaining satisfactory results. Compared with the usual SDME for CE, IL-SDME-CE is a simple, low-cost, fast and environmentally friendly preconcentration technique. 2010 Elsevier B.V. All rights reserved.


Patent
CAS Lanzhou Institute of Chemical Physics | Date: 2013-09-27

A process for producing N-methyl or N,N-dimethyl amines, which comprises using amine compound, nitro-containing compound or nitrile compound as a starting material, carbon dioxide as a methylating agent and hydrogen gas as a reducing agent, and allowing them to react in a sealed reactor for 6 to 48 h in a reaction medium at a reaction temperature of 80 to 180 C. in the presence of a composite catalyst, so as to provide N-methyl or N,N-dimethyl amines. The process of the present invention is simple and under relative mild reaction conditions. By means of the process of the invention, the target products can be prepared at low cost with a high yield. The catalysts used have a high catalytic activity and can be separated from the reaction system simply and reused. Furthermore, the whole process of the present invention is environmental-friendly and facilitates the cycling use of carbon dioxide.

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