Apparatus for and method of producing aromatic carboxylic acids

Details Apparatus for and method of producing aromatic carboxylic acids Apparatus for and method of producing aromatic carboxylic acids

2006-12-26

2006-12-26

Bhat, N. (Department: 1764)

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including internal mixing or stirring means

C422S225000, C422S229000, C562S412000, C562S414000, C366S327300, C366S330300

Reexamination Certificate

active

07153480

ABSTRACT:
A reactor for the oxidation of a precursor to an aromatic carboxylic acid or ester thereof in a liquid phase reaction mixture is disclosed. The reactor comprises an elongate vessel, substantially vertical in use, having an upper mixing element and a lower mixing element, characterised in that the upper mixing element is an axial pumping impeller and the lower mixing element is a radial pumping impeller. A process of producing a carboxylic acid or ester thereof in a reactor of the invention is also disclosed. In use, the configuration of mixing elements leads to three highly turbulent mixing zones. In a preferred embodiment of the process of the present invention oxidant, from one inlet, and solvent, precursor and catalyst, are introduced directly into a mixing zone. The highly turbulent mixing zones lead to rapid mass transfer suppressing the formation of unwanted, coloured by-products and reduced reactor fouling.

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