Dryer effluent monitoring in a chemical pilot plant via fiber-optic near-infrared spectroscopy

被引：13

作者：

Coffey, C ^{[1
]}

Predoehl, A ^{[1
]}

Walker, DS ^{[1
]}

机构：

[1] Glaxo Wellcome Inc, Res Triangle Pk, NC 27709 USA

来源：

APPLIED SPECTROSCOPY | 1998年 / 52卷 / 05期

关键词：

near-infrared spectroscopy; online process measurement; fiber-optics spectroscopy;

D O I：

10.1366/0003702981944139

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

The monitoring of the effluent of a rotary dryer has been developed and implemented, The vapor stream between the dryer and the vacuum is monitored in real time by a process fiber-optic coupled near-infrared (NIR) spectrometer, A partial least-squares (PLS) calibration model was developed on the basis of solvents typically used in a chemical pilot plant and uploaded to an acousto-optic tunable filter NIR (AOTF-NIR), The AOTF-NIR is well suited to process monitoring as it electrically scans a crystal and hence has no moving parts. The AOTF-NIR continuously fits the PLS model to the currently collected spectrum. The returned values can be used to follow the drying process and determine when the material can be unloaded from the dryer. The effluent stream was monitored by placing a gas cell in-line with the vapor stream. The gas cell is fiber-optic coupled to a NIR instrument located 20 m away, The results indicate that the percent vapor in the effluent stream can be monitored in real time and thus be used to determine when the product is free of solvent.

引用

页码：717 / 724

页数：8

共 6 条

[1] Simultaneous spectrophotometric determination of drugs in pharmaceutical preparations using multiple linear regression and partial least-squares regression, calibration and prediction methods [J].