|Abstract Title:||High Performance Raman Photometer for Real Time Reaction and Processing Analysis|
|Presenter Name:||Dr Honggang Li*|
|Co-authors:||Mr David Peters|
|Company/Organisation:||Schneider Electric / Applied Instrument Technologies|
|Session Choice:||Analytical Techniques: Molecular Spectroscopy and On-Line Analysis|
Abstract Information :
Modified celluloses are a group of chemicals that are derived from modification of cellulose or natural polymer. Carboxymethyl cellulose (CMC) is one of most produced compounds among those modified celluloses. Due to its water-soluble properties, it has been widely used in various industries, such as cosmetics, detergents, pharmaceuticals, food, paper, drugs and even in oil well drilling operations. The degree of substitution (DS) is a major characteristic of the properties of cellulose derivatives during CMC synthesis. There are many factors that affect DS, and one of single most important factors is the solvent composition, often comprising different kinds of alcohols in water. Tight control the solvent mole ratios in solvent feed can significantly increase production yield, reduce cost, improve process stability by improving control of CMC synthesis process. In this paper, a safe, robust, reliable, compact and low-cost Raman photometric analyzer for on-line analysis of dynamic solvent mixing process will be demonstrated for carboxymethyl cellulose production. The analyzer is comprised of an optical interface head with laser source, integrated detection optics, signal processing circuitry, custom calibration models for specific applications, which is integrated into a single package. Various solvent mixes of isopropyl alcohol (IPA), ethanol ranging from 0% to 100% concentration and IPA/ethanol mole ratio in range of 0-2 are demonstrated. In addition, application considerations in terms of temperature dependence of Raman signals, hydrogen bonding effects of various water and alcohol interactions will be discussed.