On-Line FT-NIR Method to Determine Particle Size and Distribution

摘要

This invention relates to a method for the determination of the average particle size or particle size distribution of a material in a gas phase reactor comprising: 1) analyzing the average particle size and particle size distribution of a baseline composition using the method described in ASTM D1921; 2) analyzing the average particle size and particle size distribution of said baseline composition using an FT-NIR analysis technique; 3) preparing a calibration matrix by comparing results from said reference analytical technique to the results from said FT-NIR analysis technique; 4) analyzing the material using an FT-NIR technique; and 5) identifying and quantifying the type and content of particles present in the material by comparing spectral data obtained from said FT-NIR technique of the material to said calibration matrix.;This invention also relates to a process for determining polymer properties in a polymerization reactor system using such techniques.

主权项

1. A method for the determination of the average particle size or particle size distribution of a material in a gas phase reactor comprising:
a) analyzing the average particle size and particle size distribution of a baseline composition using the method described in ASTM D1921; b) analyzing the average particle size and particle size distribution of said baseline composition using a Fourier Transform-Near Infrared, FT-NIR, analysis technique; c) preparing a calibration matrix by comparing results from said reference analytical technique from step a) to the results from said FT-NIR analysis technique from step b); d) analyzing the material using an FT-NIR technique; and e) identifying and quantifying the type and content of particles present in the material by comparing spectral data obtained from said FT-NIR technique of the material to said calibration matrix.