111-55-7Relevant articles and documents
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 synthesizing vinyl acetate
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Paragraph 0149; 0151; 0152; 0153; 0154; 0155, (2016/12/16)
The invention relates to a method for synthesizing vinyl acetate. When vinyl acetate is prepared from methyl acetate through the route of carbonylation and cracking, vinyl acetate yield and selectivity are low. The invention mainly aims at solving the problems. The vinyl acetate synthesis method comprises the following steps: methyl acetate carbonylation is carried out, such that ethylene diacetate is obtained; and ethylene diacetate is cracked, such that vinyl acetate is obtained. A carbonylation catalyst adopts SiO2, Al2O3 or a mixture thereof as a carrier, and has active components comprising at least one selected from iron-series elements, alkaline earth metal and at least one metal element selected from IB and VA. With the technical scheme, the technical problem is well solved. The method can be used in industrial production of vinyl acetate.
Synthetic method for vinyl acetate
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Paragraph 0174; 0175; 0176; 0177; 0178, (2016/12/16)
The invention relates to a synthetic method for vinyl acetate and is mainly to solve the problems of low yield and selectivity of vinyl acetate in preparation for vinyl acetate from methyl acetate successively through carbonylation and cracking routes. According to a technical scheme of the invention, the synthetic method for vinyl acetate comprises the following steps: subjecting methyl acetate to carbonylation so as to obtain ethylidene diacetate, and subjecting ethylidene diacetate to cracking so as to obtain vinyl acetate, wherein a carbonylation catalyst uses SiO2, Al2O3 or a mixture of SiO2 and Al2O3 as a carrier; an active component is at least one selected from the group consisting of platinum-cluster metals, at least one selected from the group consisting of group-VIB metals, and at least one selected from the group consisting of group-IB metals and lanthanide series metals; thus, the above-mentioned technical problems are well solved, and the synthetic method can be applied in industrial production of vinyl acetate.
Production method of vinyl acetate
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Paragraph 0173; 0175; 0176; 0177; 0178; 0179, (2016/12/16)
The invention relates to a production method of vinyl acetate and mainly solves the problems of low yield and low selectivity of the vinyl acetate when methyl acetate is successively subjected to carbonylation and pyrolysis to prepare the vinyl acetate. The production method includes the following steps: 1) carbonylating the methyl acetate to obtain ethylidene diacetate; and 2) pyrolyzing the ethylidene diacetate to obtain the vinyl acetate. A carbonylation catalyst includes a carrier being formed from SiO2, Al2O3 or a mixture of them, and an active component including at least one of platinum-series elements, at least one element from metalloid elements, and at least one metal element from the groups of IIB and lanthanide-series metals. The method solves the technical problems well and can be used in industrial production of the vinyl acetate.