Development of methods and instrumentation for NMR process analysis /
Real-time chemical analysis of production streams by on-line
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| Format: | Thesis Book |
| Language: | English |
| Published: |
[Place of publication not identified] :
[publisher not identified] ;
1996.
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| Subjects: | |
| Online Access: | http://proxy.library.tamu.edu/login?url=http://proquest.umi.com/pqdweb?did=739668861&sid=1&Fmt=2&clientId=2945&RQT=309&VName=PQD |
| Summary: | Real-time chemical analysis of production streams by on-line analytical instrumentation is an important and rapidly growing area in industrial chemistry. Numerous instrumentational technologies have left the laboratory bench and taken residence on or near chemical processes; however, the well developed field of nuclear magnetic resonance (NMR) spectroscopy still remains off-line. The purpose of this research was to develop a proof-of-concept high resolution NMR instrument capable of analyzing most types of industrial streams. The system is based upon three permanent magnets, one home built variable field (8 to 14 MHz) design and two Elbit-ATI prototype models (42 and 57-MHz). The home built magnet was designed for studying bulk materials with large sample cross sections, whereas the higher field magnets were typically used for small-gap liquid stream analysis. Additional hardware was developed for the home built magnet to improve field homogeneity and thermal stability. Other features of the system include in-house developed software for control of simulated process streams through a network of computer controlled pumps and flow controllers. Resolution obtained thus far on flowing systems was less than 2 Hz (HHFW) at 57-MHz. Resolution on the wide-gap, low-field magnet has been found to be 100 Hz or better at 12-MHz without correction. The prototype instrument was capable of rapidly determining the concentration of liquids dissolved in solids with a detection limit of 0.4 w/w%. LODs for resolvable components in liquid streams were typically 0. I v/v%. |
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| Item Description: | Vita. "Major Subject: Chemistry". Includes disk in pocket. |
| Physical Description: | xiv, 233 leaves : illustrations ; 28 cm. Issued also on microfiche from University Microfilms Inc. |
| Bibliography: | Includes bibliographical references: pages 148-155. |