Patent · US Expired

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

US6300633A · kind A · utility

7Cited by

9References

11Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Robert N. Hunt · Steubenville, US
Gary F. Allen · New Martinsville, US
Julie A. Jackson · Xenia, US
Peter Scharein · Baytown, US
Peter J. Ryan · Arroyo Grande, US
Donald Macnaughton, Jr. · New Martinsville, US
Klaus Sommer · Heidelberg, DE
Larry E. Philyaw · Seabrook, US

Key dates

Filing date	Jul 6, 1998
Grant date	Oct 9, 2001
Priority date	—
Expiry date	Jul 6, 2018

Classification

Technology area (CPC G)Physics
CPC primaryG01N21/8507
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.