Celanese International Corporation

Council of Scientific and Industrial Research

Bhaskar Datttraya Kulkarni

Prashant Purushottam Barve

Melchior A Meilchen

Ravindra William Shinde

Milind Yashwant Gupte

Ilias S Kotsianis

Barbara F M Kimmich

Sanjay Pandurang Kamble

Gopal Moreshwar Chaphekar

Hang Wang

Satish N Shintre

Amol Arvind Kulkarni

A fractal impeller design for stirred tank reactors comprising plurality of main branches, each of which further having plurality of sub-branches with each sub branch having plurality of blades to distribute/dissipate energy in uniform manner and to achieve uniform temperature throughout the reactor while operating it at lower impeller speed to avoid high shear zones; wherein, the angular distances covered by the blades vary and yield variation in the local blade passage velocity for a given impeller rotation speed.

Fractal impeller for stirring

A continuous process is provided for selective formation of a vinyl ester by reactive distillation from a corresponding carboxylic acid. Carboxylic acid, vinyl acetate, and a palladium acetate&#x2014;bidentate ligand catalyst complex are provided and reacted in a typical embodiment. Acetic acid and vinyl acetate are continuously removed from the reaction mixture and vinyl acetate is recycled to the reaction mixture. The vinyl ester product is separated from the vinyl acetate, residual carboxylic acid, residual acetic acid, and catalyst.

Process for the continuous transvinylation of carboxylic acids with vinyl acetate

A semi-continuous process is provided for selective formation of a vinyl ester by reactive distillation from a corresponding carboxylic acid. Carboxylic acid, vinyl acetate, and a palladium acetate&#x2014;bidentate ligand catalyst complex are provided and reacted in a typical embodiment. Acetic acid and vinyl acetate are continuously removed from the reaction mixture and vinyl acetate is recycled to the reaction mixture. The vinyl ester product is separated from the vinyl acetate, residual carboxylic acid, residual acetic acid, and catalyst.

Process for the semi-continuous transvinylation of carboxylic acids with vinyl acetate

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Pune, India

Bhaskar Datttraya Kulkarni