Abstract: The present invention pertains to the technical field of energy resource chemical industry, and in particular relates to a continuous reaction device and process for synthesizing polyoxymethylene dimethyl ethers by using paraformaldehyde and methylal as feedstock or using trioxane and methylal as feedstock in the presence of an acidic catalyst. The continuous reaction device comprises multiple slurry bed stirred tank reactors connected in series or in combination of series connection and parallel connection, and also comprises an on-line solid-liquid separation device to perform separation of the reaction mixture from the catalyst. Each of the tank reactors is provided with an axial-flow stirring paddle having 2-6 blades per layer, to ensure sufficient mixing of the reactants with the catalyst.

Abstract: The present invention relates to a method for refining polyoxymethylene dialkyl ethers by catalytic hydrogenation using a slurry bed, wherein, using a slurry bed reactor for refining by hydrogenation, an equilibrium system containing polyoxymethylene dialkyl ethers products is refined by catalytic hydrogenation, so as to remove formaldehyde contained therein. The refining method by hydrogenation described in the present invention can remarkably increase the separation and purification efficiency of polyoxymethylene dialkyl ethers, and the polyoxymethylene dialkyl ethers obtained after subsequent rectification have a purity greater than 99.5%, a product yield greater than 97% and an atom utilization ratio close to 100%.

Abstract: The present invention relates to a method for refining polyoxymethylene dialkyl ethers by catalytic hydrogenation using a slurry bed, wherein, using a slurry bed reactor of refining by hydrogenation, an equilibrium system of products containing polyoxymethylene dialkyl ethers is refined by catalytic hydrogenation, so as to remove formaldehyde contained therein. 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%.