Union Carbide Chemicals & Plastics Technology Corporation

Arkema Inc.

Arkeme Inc.

Patrick M Wiegand

Olan Stanley Fruchey

William G Etzkorn

Roger L Roundy

Fungau Ho

George W Schwarz, Jr

Cloid Russell Smith, Iii

Christopher T Reeves

John F Fisher

Timothy D Ligon

Mahmood N A Jawaid

Courtland P Sears, Iii

Elizabeth S Ballard

John Roberts Parrish

John R Parris

Mahmood NA Jawaid

An improved process for the manufacture of technical grade (meth)acrylic acid, e.g., acrylic acid, the process comprising producing a hydrated reaction product from the gas-phase oxidation of at least one (meth)acrylic acid precursor, e.g., propylene, followed by first dehydrating and then concentrating the reaction product, the improvement comprising controlling at least one of the water, acetic acid and (meth)acrylic acid content of the reaction product during the purification of the reaction product using on-line, near IR spectroscopy.

Control of a process for the purification of (meth)acrylic acid using on-line, near IR analysis

The present invention is directed to methods and apparatus for conducting gas chromatography more rapidly than previously disclosed. By means of the present invention the time necessary to conduct a gas chromatographic analysis can be reduced by more than 50%. The methods and apparatus employed reduce system dead volumes to prevent band broadening and mixing of the sample components as the gas sample is analyzed. The present invention also relates to the apparatus described above as applied to controlling chemical, refining, and other processes.

Fast gas chromatography method, apparatus and applications

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South Charleston, WV, United States of America

Patrick M Wiegand