Phillips Petroleum Company

Donald D DeFord

Edwin K Clardy

Lewis B Roof

Edward N Fuller

A continually repeated chemical analysis of a process stream sample is effected by interposing the sample in a flow of titrant, flow of which is interrupted only to permit the interposition of the sample in the line of flow. A holding zone or chamber, e.g. a chromatographic column receives and holds titrant until the interposed sample in the column is titrated. Reaction product eluted from the column is detected.

Method and apparatus suitable for repeated, accurate chemical analyses

A quantitative analysis of the concentration of the individual components in a sample is obtained using a chromatographic analyzer without the need to calibrate the chromatographic analyzer detector. Two chromatographic analyzer systems are utilized to analyze two identical samples using two different carrier fluids. The difference in the response of the two chromatographic analyzers is proportional to the difference in the properties of the two carrier fluids being measured by the chromatographic analyzer detectors and the concentration of the desired component of the sample. Because the proportionality does not involve the property of the individual sample component being measured by the chromatographic analyzer detector, it is possible to obtain a quantitative analysis of the concentration of the individual components of the sample without the need to calibrate the chromatographic analyzer detectors.

Quantitative chromatographic analysis without calibration

A method and apparatus is disclosed for correcting errors in a chromatographic analysis caused by changes in ambient atmospheric pressure. The output signal from a chromatograph is summed with the output signal from a pressure transducer. The output signal from the pressure transducer varies with changes in the atmospheric pressure from a reference pressure and is calibrated in such a manner as to provide a corrected chromatographic analyzer output signal when it is summed with the output signal from the chromatograph. In this manner pressure compensation is provided where normalization of the chromatographic analyzer output signal is not possible or is undesirable.

Pressure compensation method and apparatus for a chromatograph

Chromatographic analysis of the volatile components of a liquid having both volatile and nonvolatile components is accomplished by vaporizing the volatile portion of a liquid sample in a hollow tubular vaporizing column and subsequently analyzing the thus-vaporized portion of the sample. The nonvolatile components of the sample are retained in the vaporizing column during vaporizaton and then are removed by backflushing the vaporizing column with a preselected volume of a liquid solvent.

Chromatographic analysis

The resolution of chromatographic peaks is enhanced by removing trailing edges from the peaks. This is accomplished by combining a first signal representative of the chromatographic analyzer output with one or more delayed second signals which are derived from the first signal.

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Glenview, IL, United States of America

Donald D DeFord