Dow Global Technolgoies LLC

Douglas A Stallard

John G Pendergast, Jr

Andrei S Merenov

Joerg-Peter Gehrke

Luca Balbo

John G Pendergrast, Jr

Amilcar R Collado

David D Hibbitts

The present disclosure relates, according to some embodiments, to apparatus, systems, and/or methods for fractionating a feed mixture comprising, for example, one or more isocyanates, light components, solvents and/or heavier components. In some embodiments, fractionating an isocyanate feed mixture may comprise distilling the feed mixture in a non-adiabatic fractionating apparatus comprising a prefractionating section and/or column and a main section and/or column, which comprises a rectification section, a side section, and a stripping section. For example, isocyanates may be separated from light component(s), solvent(s) and/or heavier component(s). A fractionating apparatus may be configured and arranged, in some embodiments, as a dividing wall column. According to some embodiments of the disclosure, apparatus, systems, and/or methods may be energy efficient and/or may have a broad operating range.

Apparatus, systems, and methods for purification of isocyanate mixtures

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Lake Jackson, TX, United States of America

Douglas A Stallard