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Chemometric methods for process monitoring and high-performance controller design (1992)

Kaspar, Michael H. ; Ray, W. Harmon

Hoboken, NJ : Wiley-Blackwell

AIChE Journal 38 (1992), S. 1593-1608

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ISSN: 0001-1541

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology , Process Engineering, Biotechnology, Nutrition Technology

Notes: A huge amount of data is collected by computer monitoring systems in the chemical process industry. Such tools as principal component analysis and partial least squares have been shown to be very effective in compressing this large volume of noisy correlated data into a subspace of much lower dimension than the original data set. Because most of what is eliminated is the collinearity of the original variables and the noise, the bulk of the information contained in the original data set is retained. The resulting low dimensional representation of the data set has been shown to be of great utility for process analysis and monitoring, as well as in selecting variables for control. These types of models can also be used directly in control system design. One way of approaching this is to use the loading matrices as compensators on the plant. Some advantages of using this approach as part of the overall control system design include automatic decoupling and efficient loop pairing, as well as natural handling of nonsquare systems and poorly conditioned systems.

Additional Material: 20 Ill.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1002/aic.690381010

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Stabilizer insights by NMR spectroscopy (1990)

Fisch, Michael H.

Brookfield, Conn. : Wiley-Blackwell

Journal of Vinyl and Additive Technology 12 (1990), S. 136-141

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ISSN: 0193-7197

Keywords: Chemistry ; Chemical Engineering

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Process Engineering, Biotechnology, Nutrition Technology

Notes: During the past decade, advances in both hardware and software have made NMR spectroscopy an enormously powerful analytical technique. In this paper, the author presents examples of the use of NMR in support of vinyl stabilizer research; he also covers representative practical applications of proton, carbon, phosphorus, and tin NMR.

Additional Material: 15 Ill.