Bayer Corporation

Larry E Philyaw

Robert Nathan Hunt

Gary F Allen

Klaus Sommer

Julie A Jackson

Donald Macnaughton, Jr

Peter J Ryan

Peter Scharein

An in-line spectrometric method for determining the distillation residue content in an opaque, dark-colored mixture containing an isocyanate and tar-like materials (residue) during the isocyanate production process. A probe capable of directing light at wavelengths of from 1050 to 2150 nm is inserted in a stream of the residue-containing mixture and light is transmitted through the stream. Light absorption data is collected and a near-infrared spectrum is generated. The residue content is then determined using a chemometric model. Knowledge of the residue content makes it possible to control and optimize the distillation process.

In-line method for determining the residue content of an isocyanate and apparatus useful therefor

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Seabrook, TX, United States of America

Larry E Philyaw