Abstract

The methods described herein are of general interest because they illustrate the effectiveness of infra-red in the analysis of hydrocarbons and the control of experimental and pilot-plant processes. Some particular problems are discussed. These problems vary in complexity from analyzing for two components in a mixture of two, to analyzing for three components in a mixture of twelve or six in a mixture of six. In some cases the analyses are possible only for certain ranges of concentration; in other cases the concentrations of the components can vary from 0 to 100 percent.

The analyses were determined with an accuracy of plus or minus 1 percent, providing the range of concentration of the various components stayed within the limits for which the method was calibrated.

In some cases it was necessary to set up calibration curves with inadequate standard samples. It is most interesting that even under these adverse conditions it was possible to attain reasonable accuracy and to make a contribution to the problem of controlling the pilot-plant. In control problems it is frequently not important to know the absolute composition; it is sufficient to know relative values of concentration from day to day.

© 1949 Optical Society of America

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