A process for selective oxidation of dimethyl-1,1-biphenyl to form methyl-1,1-biphenyl mono-carboxylic acid(s), comprising contacting a solution of dimethyl-1,1-biphenyl in acetic acid solvent in the presence of a Co(II) acetate catalyst and air, and optionally adding a co-solvent, or adding sodium or potassium acetate, and oxidizing the dimethyl-1,1-biphenyl under time and temperature conditions sufficient to form one or more methyl-1,1-biphenyl mono-carboxylic acid(s). The mono-carboxylic acids are advantageously isolated and esterified to form biphenyl mono-esters for use as plasticizers.

A process for selective oxidation of dimethyl-1,1-biphenyl to form methyl-1,1-biphenyl mono-carboxylic acid(s), comprising contacting a solution of dimethyl-1,1-biphenyl in acetic acid solvent in the presence of a Co(II) acetate catalyst and air, and optionally adding a co-solvent, or adding sodium or potassium acetate, and oxidizing the dimethyl-1,1-biphenyl under time and temperature conditions sufficient to form one or more methyl-1,1-biphenyl mono-carboxylic acid(s). The mono-carboxylic acids are advantageously isolated and esterified to form biphenyl mono-esters for use as plasticizers.

A process for selective oxidation of dimethyl-1,1-biphenyl(s) to form methyl-1,1-biphenyl mono-carboxylic acid(s), which can be esterified to form plasticizers, comprising contacting a solution of dimethyl-1,1-biphenyl(s) in acetic acid in the presence of an oxidation catalyst and air under time and temperature conditions sufficient to oxidize the dimethyl-1,1-biphenyl(s) into one or more methyl-1,1-biphenyl mono-carboxylic acid(s) products, conducting at least one of (i) adding an antisolvent, or (ii) optimizing a total conversion of dimethyl-1,1-biphenyl(s) by oxidation based upon a molar ratio of dimethyl-1,1-biphenyl isomers, or (iii) precipitating the methyl-1,1-biphenyl mono-carboxylic acid(s) products by lowering the temperature, or (iv) decreasing the oxidation reaction temperature to enhance conversion of aldehydes over methyl functional groups, so as to limit over-oxidation of the dimethyl-1,1-biphenyl(s), wherein the oxidation reaction is conducted in the absence of bromide-containing catalysts.

A process for selective oxidation of dimethyl-1,1-biphenyl(s) to form methyl-1,1-biphenyl mono-carboxylic acid(s), which can be esterified to form plasticizers, comprising contacting a solution of dimethyl-1,1-biphenyl(s) in acetic acid in the presence of an oxidation catalyst and air under time and temperature conditions sufficient to oxidize the dimethyl-1,1-biphenyl(s) into one or more methyl-1,1-biphenyl mono-carboxylic acid(s) products, conducting at least one of (i) adding an antisolvent, or (ii) optimizing a total conversion of dimethyl-1,1-biphenyl(s) by oxidation based upon a molar ratio of dimethyl-1,1-biphenyl isomers, or (iii) precipitating the methyl-1,1-biphenyl mono-carboxylic acid(s) products by lowering the temperature, or (iv) decreasing the oxidation reaction temperature to enhance conversion of aldehydes over methyl functional groups, so as to limit over-oxidation of the dimethyl-1,1-biphenyl(s), wherein the oxidation reaction is conducted in the absence of bromide-containing catalysts.

The present disclosure relates to a process and a device for producing vinyl acetate by an ethylene process. By additionally arranging an ethylene recovery membrane assembly in a vinyl acetate synthesis section, the content of inert components such as nitrogen in a circulating system is controlled, ethylene gas is recovered from non-condensable gas, and a recovery rate of the ethylene reaches 58% or above. By adding sideline extraction at a refined VAC tower in a vinyl acetate refining section, a vinyl acetate product with purity higher than 99.98% is obtained, a mass fraction of acetic acid is less than or equal to 20 ppm, a mass fraction of acetaldehyde is less than or equal to 20 ppm, and a mass fraction of water is less than or equal to 100 ppm. In synthesis and refining processes of the vinyl acetate, a cooling method is adopted.

The present disclosure relates to a process and a device for producing vinyl acetate by an ethylene process. By additionally arranging an ethylene recovery membrane assembly in a vinyl acetate synthesis section, the content of inert components such as nitrogen in a circulating system is controlled, ethylene gas is recovered from non-condensable gas, and a recovery rate of the ethylene reaches 58% or above. By adding sideline extraction at a refined VAC tower in a vinyl acetate refining section, a vinyl acetate product with purity higher than 99.98% is obtained, a mass fraction of acetic acid is less than or equal to 20 ppm, a mass fraction of acetaldehyde is less than or equal to 20 ppm, and a mass fraction of water is less than or equal to 100 ppm. In synthesis and refining processes of the vinyl acetate, a cooling method is adopted.

The present invention relates to a porous catalyst support, consisting of a material comprising a natural sheet silicate, containing ZrO.sub.2 dispersed throughout the material. The present invention also relates to a method for the production of the catalyst support according to the invention and to a shell catalyst containing the catalyst support according to the invention and also the use of the catalyst according to the invention in particular for the production of vinyl acetate monomer (VAM).

The present invention proposes coupling an oxidative dehydrogenation with a vinyl acetate synthesis, wherein the vinyl acetate synthesis is fed with ethylene and acetic acid from the oxidative dehydrogenation. A common carbon dioxide removal is provided.

The present invention proposes coupling an oxidative dehydrogenation with a vinyl acetate synthesis, wherein the vinyl acetate synthesis is fed with ethylene and acetic acid from the oxidative dehydrogenation. A common carbon dioxide removal is provided.

The present invention proposes coupling an oxidative dehydrogenation with a vinyl acetate synthesis, wherein the vinyl acetate synthesis is fed with ethylene and acetic acid from the oxidative dehydrogenation. A common carbon dioxide removal is provided.