• Effects of diesel/PODE (polyoxymethylene dimethyl ethers ...

    Request PDF on ResearchGate | Effects of diesel/PODE (polyoxymethylene dimethyl ethers) blends on combustion and emission characteristics in a heavy duty diesel engine | Polyoxymethylene dimethyl ...

  • Reaction kinetics of the production of polyoxymethylene ...

    The synthesis of polyoxymethylene dimethyl ethers (PODEn) from methanol and formaldehyde was studied in a fixed bed reactor over the strong acid cation exchange resin catalyst.

  • Synthesis and Application of Polyoxymethylene Dimethyl Ethers

    Abstract: Polyoxymethylene dimethyl ethers (DMM n) were synthesized in moderate yields by the reaction of methylal and paraformaldehyde catalyzed by solid acid.The pure components of DMM 2, DMM 3, DMM 4, and DMM 5 obtained by rectification were characterized by 1 H NMR and mass spectra.

  • Graphene oxide: an effective acid catalyst for the synthesis ...

    Graphene oxide: an effective acid catalyst for the synthesis of polyoxymethylene dimethyl ethers from methanol and trioxymethylene Ruiyi Wang,a,b Zhiwei Wu,a Zhangfeng Qin,*a Chengmeng Chen,c Huaqing Zhu,a Jianbing Wu,a,b Gang Chen,b Weibin Fana and Jianguo Wang*a

  • Effects of polyoxymethylene dimethyl ethers on the solubility ...

    technologies of polyoxymethylene dimethyl ethers. Appl Energy. 2019;233:599‐611. 60. Liu J, Wang H, Li Y, et al. Effects of diesel/PODE (polyoxymeth-ylene dimethyl ethers) blends on combustion and emission charac-teristics in a heavy duty diesel engine. Fuel. 2016;177:206‐216. 61. Li R, Liu Z, Han Y, et al. Target‐oriented fuel design for ...

  • Ch Chemical Sciences Journal

    were investigated for dimethyl ether (DME) direct oxidation to polyoxymethylene dimethyl ethers (DMMx) (x=1-2). The best catalytic performance was obtained over 15%V2O5/Hβ. The catalysts were characterized by XRD, BET, NH3-TPD, H2-TPR, XPS and FT-IR in order to provide the further insight in the relationship of structure and activity.

  • Lewis acids promote the catalytic selectivity to ...

    Polyoxymethylene dimethyl ethers (PODE n with n = 3–8) is a new biofuel that has a great potential to become one of the competitive alternative fuels for diesel engine. It also plays a crucial role in expansion of C1 chemical industry.

  • File:Polyoxymethylene dimethyl ether.svg - Wikipedia

    This file contains additional information, probably added from the digital camera or scanner used to create or digitize it. If the file has been modified from its original state, some details may not fully reflect the modified file.

  • Synthesis of Polyoxymethylene Dimethyl Ethers Catalyzed by ...

    Catalytic reaction of methylal (DMM) with trioxane (TOX) for preparation of polyoxymethylene dimethyl ethers (PODME n, CH 3 O(CH 2 O) n CH 3, where n > 1) was investigated in a series of Brønsted acid ionic liquids with alkanesulfonic acid groups.

  • PROCESS FOR PREPARING POLYOXYMETHYLENE DIMETHYL ETHERS FROM ...

    Process for preparing polyoxymethylene dimethyl ethers having ≥3 oxymethylene units (OME n≥3), comprising the steps: (i) introduction of formaldehyde, methanol and water into a reactor R and reaction to give a reaction mixture containing formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OME n=1) and polyoxymethylene dimethyl ethers (OME n>1 ...

  • Polyoxymethylene dimethyl ethers | Sigma-Aldrich

    Search results for Polyoxymethylene dimethyl ethers at Sigma-Aldrich

  • Synthesis of polyoxymethylene dimethyl ethers from methylal ...

    The flask was immersed in a constant-temperature water bath. A magnetic stirrer was utilized for solution preparation. The precision of the analytical balance was 0.1 mg. Synthesis of polyoxymethylene dimethyl ethers (PODME n) catalyzed by the [RImBs][HSO 4] ionic liquid

  • US7671240B2 - Method for producing polyoxymethylene dimethyl ...

    Processes for preparing tri- and tetraoxymethylene glycol dimethyl ether (POMDME n=3,4 ) include feeding a reaction mixture of an aqueous formaldehyde solution and methanol into a reactive evaporator and separating into a first low boiler fraction and a first high boiler fraction, recycling the first high boiler fraction into the reactor, feeding the first low boiler fraction into a first ...

  • Efficient synthesis of poly(oxymethylene) dimethyl ethers ...

    Chen J, Tang ZH, Xia CG, Zhang XZ, Li Z. Method for producing polyoxymethylene dimethyl ethers from methanol and trioxane in the presence of an ionic liquid acidic catalyst. PRC Patent, CN 101182367A, 2008 Google Scholar

  • Experimental investigation into the oxidation reactivity and ...

    Experimental investigation into the oxidation reactivity and nanostructure of particulate matter from diesel engine fuelled with diesel/polyoxymethylene dimethyl ethers blends

  • Method for producing polyoxymethylene dimethyl ethers from ...

    This forms polyoxymethylene dimethyl ethers where n=2-5 with a selectivity of 94.8%, the dimer (n=2) being obtained to an extent of 49.6%. The resulting polyoxymethylene dimethyl ethers are added to a diesel fuel in amounts of from 4 to 11% by weight.

  • High-efficiency catalytic synthesis of polyoxymethoxy ...

    [9] Hagen G P, Spangler M J. Preparation of polyoxymethylene dimethyl ethers by catalytic conversion of dimethyl ether with formaldehyde formed by dehydrogenation of dimethyl ether: US6160186A [P]. 2000-12-30. [10] Zhao Y P, Xu Z, Chen H, et al. Mechanism of chain propagation for the synthesis of polyoxymethylene dimethyl ethers [J].

  • Plural oxyalkylene groups bonded directly to each other ...

    The refining method by hydrogenation described in the present invention is able to remarkably increase the extracting rate of polyoxymethylene dialkyl ethers, and the polyoxymethylene dialkyl ethers obtained after subsequent rectification have purity greater than 99.5%, yield greater than 97% and atom utilization ratio close to 100%.

  • Prominent role of mesopore surface area and external acid ...

    H-ZSM-5 zeolite has been shown to be an active catalyst for the synthesis of polyoxymethylene dimethyl ethers (OME). However, we demonstrated – by passivation of the zeolite's external surface – that the reaction rate is limited due to severe internal diffusion limitations of the reactants and products.

  • Electronic supplementary information (ESI) for the manuscript ...

    Electronic supplementary information (ESI) for the manuscript: High Si/Al ratio HZSM-5 zeolite: an efficient catalyst for the synthesis of polyoxymethylene dimethyl ethers from dimethoxymethane and trioxymethylene Jianbing Wu,a,b,c Huaqing Zhu,a Zhiwei Wu,a Zhangfeng Qin,*a Lai Yan,b,d Baoliang Du,b Weibin Fana and Jianguo Wang*a

  • US20180134642A1 - Process for preparing polyoxymethylene ...

    Process for preparing polyoxymethylene dimethyl ethers having ≥3 oxymethylene units (OME n≥3 ), comprising the steps: (i) introduction of formaldehyde, methanol and water into a reactor R and reaction to give a reaction mixture containing formaldehyde, water, methylene glycol, polyoxymethylene glycols, methanol, hemiformals, methylal (OME n=1 ) and polyoxymethylene dimethyl ethers (OME n>1 ...

  • Polyoxymethylene dimethyl ethers - Wikipedia

    Polyoxymethylene dimethyl ethers (PODE or DMMn) are a class of chemical compounds with the molecular formula H 3 CO(CH 2 O) n CH 3 where n is typically about 3 to 8.. PODE can be produced from methylal and formaldehyde or a formaldehyde equivalent such as paraformaldehyde or trioxane.

  • Poly(oxymethylene) Dimethyl Ethers As Components of Tailored ...

    Poly(oxymethylene) Dimethyl Ethers as components of tailored diesel fuel - properties, synthesis and purification concepts Jakob Burger 1*, Markus Siegert 2, Eckhard Ströfer 2, Michael Nilles 2, Hans Hasse 1

  • Final Report on the Safety Assessment of Polyoxymethylene Urea'

    Report on the Safety Assessment of this ingredient can be found in the Journal of the American College of Toxicology, Vol. 3, No. 3 (Elder, 1984). CHEMISTRY Definition and Structure Polyoxymethylene Urea (CAS No. 901 l-05-6) is a reaction product of urea with formaldehyde (Nikitakis et al., 1991).

  • (PDF) Catalysis Chemistry of Dimethyl Ether Synthesis

    PDF | Dimethyl ether (DME) is receiving great attention as a clean alternative fuel, owing to the increasing energy demand. Despite tremendous efforts, catalytic synthesis of DME via a high ...

  • Synthesis of Polyoxymethylene Dimethyl Ethers From ...

    Synthesis of Polyoxymethylene Dimethyl Ethers From Dimethoxymethane and Paraformaldehyde Catalyzed By Cation Exchange Resins. ... (methanol, dimethyl ether ...

  • Research Progress on Polyoxymethylene Dimethyl Ethers as the ...

    Due to the good chemical properties, polyoxymethylene dimethyl ethers (DMMn) are regarded as an outstanding additive component of diesel fuel, which are efficient in reducing the formation of soot during the combustion when added to diesel fuel.

  • Effects of polyoxymethylene dimethyl ethers on the solubility ...

    Abstract Ethanol is an oxygen‐containing renewable clean fuel. The use of ethanol in engines can reduce greenhouse emissions and pollutant emissions of NOx and soot.

  • Dimethyl Ether - DieselNet

    Polyoxymethylene dimethyl ethers—abbreviated OME, PODE or POMDME—are a class of DME derivatives that include several oxymethylene (-O-CH 2-) groups in the molecule, with a chemical formula CH 3 (-O-CH 2) n-O-CH 3 (Figure 2). OME compunds with n of 3-4 were tested as diesel engine fuels [3646]. Like DME, OME fuels are characterized by soot ...

  • Catalytic synthesis of polyoxymethylene dimethyl ethers (OME ...

    Polyoxymethylene dimethyl ethers (OME) containing 3–5 CH 2 O units (OME 3–5) are appealing oxygenated fuels, which can be used in diesel engines with only slight fuel system modifications. Their combustion leads to reduced hazardous exhaust gas emissions compared to standard diesel.

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