111-55-7Relevant academic research and scientific papers
Zinc-catalyzed depolymerization of polyethers to produce valuable building blocks
Enthaler, Stephan
, p. 850 - 859 (2014)
The recycling of polymers continues to be a significant matter for a sustainable society. In particular, the conversion of end-of-life polymers to monomers or suitable low-molecular weight chemicals creates a feedstock for new high-quality polymeric materials and contributes to conserve resources and allow overall an efficient waste-managing system. In the present study, we have set up a straightforward methodology for the depolymerization of artificial polyethers applying cheap and abundant zinc( II) salts as precatalysts. In the presence of bio-based fatty acid chlorides as depolymerization reagent well-defined chloroesters were accessible in good to excellent yields. Moreover, acetic anhydride and fatty acids were applied as depolymerization reagents resulting in the formation of diacetates in moderate yields. In both cases the obtained products (chloroesters, diacetates) can be useful building blocks in polymerization chemistry. Noteworthy, overall a recycling of polyethers are possible. Springer Science+Business Media New York 2014.
Selective Production of C2-Oxygenate Esters from Synthesis Gas using Mixed Metal Homogeneous Catalysts
Whyman, Robin
, p. 1439 - 1441 (1983)
C2-Oxygenate esters, particularly ethylene glycol diacetate, may be prepared in high selectivity directly from synthesis gas in the presence of composite homogeneous catalysts which contain mixtures of ruthenium and rhodium, as major and minor components respectively, together with promoters in the form of nitrogen-containing bases or alkali metal cations, in acetic acid as solvent.
Vicinal Glycol Esters from Synthesis Gas
Knifton, John F.
, p. 188 - 189 (1981)
Vicinal glycol esters, such as ethylene glycol acetate esters, are prepared from synthesis gas via the use of homogeneous ruthenium catalysis.
A Reversible Liquid-to-Liquid Organic Hydrogen Carrier System Based on Ethylene Glycol and Ethanol
Zhou, Quan-Quan,Zou, You-Quan,Ben-David, Yehoshoa,Milstein, David
, p. 15487 - 15490 (2020/10/02)
Liquid organic hydrogen carriers (LOHCs) are powerful systems for the efficient unloading and loading molecular hydrogen. Herein, a liquid-to-liquid organic hydrogen carrier system based on reversible dehydrogenative coupling of ethylene glycol (EG) with ethanol catalysed by ruthenium pincer complexes is reported. Noticeable advantages of the current LOHC system is that both reactants (hydrogen-rich components) and the produced esters (hydrogen-lean components) are liquids at room temperature, and the dehydrogenation process can be performed under solvent and base-free conditions. Moreover, the hydrogenation reaction proceeds under low hydrogen pressure (5 bar), and the LOHC system has a relatively high theoretical gravimetric hydrogen storage capacity (HSC>5.0 wt %), presenting an attractive hydrogen storage system.
Synthesis of glycol diesters through the depolymerization of polyethylene glycols with carboxylic acids using a proton-exchanged montmorillonite catalyst
Maeno, Zen,Midogochi, Kaoru,Mitsudome, Takato,Mizugaki, Tomoo,Jitsukawa, Koichiro
supporting information, p. 832 - 835 (2018/02/06)
A convenient and sustainable method for the synthesis of glycol diesters was developed through the depolymerization of polyethylene glycols (PEGs) with carboxylic acids using proton-exchanged montmorillonite as an efficient solid acid catalyst. Several functionalized glycol diesters were obtained in good yields from PEGs and readily available carboxylic acids. Upon reaction completion, the catalyst could be easily separated by filtration and reused with its activity remaining unchanged.
Effective management of polyethers through depolymerization to symmetric and unsymmetric glycol diesters using a proton-exchanged montmorillonite catalyst
Maeno, Zen,Yamada, Shota,Mitsudome, Takato,Mizugaki, Tomoo,Jitsukawa, Koichiro
supporting information, p. 2612 - 2619 (2017/07/17)
From the standpoint of green sustainable chemistry, it is very important to build a resource recycling system. Herein, an efficient and practical method for catalytic depolymerization of polyethers to glycol diesters was developed using proton-exchanged montmorillonite (H-mont). H-mont uniquely exhibited high catalytic activity for the depolymerization of polyethers with benzoic anhydride to symmetric glycol dibenzoates under mild reaction conditions. Various symmetric and unsymmetric glycol diesters were obtained from the reaction of diverse polyethers with carboxylic acid derivatives. The high catalytic efficiency for this depolymerization of H-mont is interpreted by its character, in which the montmorillonite layers act as an effective two-dimensional macroligand to form the intercalated complex with polyethers. Furthermore, a new protocol for the utilization of waste polyethers in water was developed based on the catalytic and adsorption abilities of H-mont.
the acidity is solidcarries ionic liquid catalyst for synthesizing ethylene glycol acetate method
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Paragraph 0023-0028, (2017/02/24)
The invention discloses a method for synthesizing glycol diacetate under the catalytic action of an acidic immobilized ionic liquid. Under the catalytic action of an acidic immobilized ionic liquid, ethylene glycol and acetic acid used as raw materials are directly esterified to synthesize the glycol diacetate in a batch rectification tower, wherein the acidic immobilized ionic liquid is an acidic ionic liquid immobilized on the surface or in the pores of a support. The method has the advantages of high reaction selectivity, mild conditions, high raw material conversion rate and the like, and the catalyst can be easily separated from the reaction system and is recyclable. The glycol diacetate yield of the method can reach 99.4%, and the reaction selectivity can reach 99.5% above.
Method for synthesis of vinyl acetate
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Paragraph 0131; 0134; 0136, (2016/12/16)
The invention relates to a method for synthesis of vinyl acetate. The method mainly solves the problem that the existing vinyl acetate preparation method utilizing methyl acetate carbonylation and carboxide cracking has a low yield and low selectivity. The method provided through the invention comprises methyl acetate carbonylation for ethylidene diacetate preparation and ethylidene diacetate cracking for vinyl acetate preparation. A carbonylation catalyst comprises a carrier and rhodium, copper, lanthanum and lithium on the carrier. The carrier is at least one of silicon oxide and alumina. The method well solves the technical problem and can be used for vinyl acetate industrial production.
Method for preparing vinyl acetate
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Paragraph 0110; 0111; 0118; 0119, (2016/12/01)
The invention relates to a method for preparing vinyl acetate. The method mainly solves the problem that the prior art for preparing vinyl acetate through methyl acetate carbonylation and carboxide cracking has a low yield and low selectivity. The method provided through the invention comprises methyl acetate carbonylation for ethylidene diacetate preparation and ethylidene diacetate cracking for vinyl acetate preparation. A carbonylation catalyst utilizes SiO2, Al2O3 or their mixture as a carrier and active ingredients comprise rhodium and at least one of cerium, strontium and tin. The method well solves the technical problem and can be used for vinyl acetate industrial production.
Method for synthesis of vinyl acetate through hydroformylation of methyl acetate
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Paragraph 0162; 0169; 0170, (2016/12/01)
The invention relates to a method for synthesis of vinyl acetate through hydroformylation of methyl acetate. The method mainly solves the problem that the existing vinyl acetate preparation method utilizing methyl acetate carbonylation and carboxide cracking has a low yield and low selectivity. The method provided through the invention comprises methyl acetate carbonylation for ethylidene diacetate preparation and ethylidene diacetate cracking for vinyl acetate preparation. A carbonylation catalyst utilizes SiO2, Al2O3 or their mixture as a carrier and active ingredients comprise at least one of iron group metal elements, at least one of IIIB elements and at least one of VA and alkaline earth metals. The method well solves the technical problem and can be used for vinyl acetate industrial production.
