The Dow Chemical Company

Dow Global Technolgoies LLC

Jeffrey Robert Larson

Mark William Beach

Robert A Bredeweg

Nile Nelson Frawley

Stephen W Barr

Steven Randall Erskine

Mark Lindsay Dittenhafer

Joseph J Kiefer

A method for calibrating an analysis instrument, e.g., a gas chromatograph, for water analysis that includes four steps. The first step is to continuously remove water from a liquid that contains water to produce a liquid containing a reduced amount of water such as by membrane pervaporation. The second step is to analyze the liquid containing a reduced amount of water for water by a reference water analysis method such as by Karl Fischer titration. The third step is to analyze the stream of liquid containing a reduced amount of water using the instrument to be calibrated, e.g., a gas chromatograph having a helium photoionization pulse discharge detector. The fourth step is to calibrate the instrument using the analysis of the second step. In a related embodiment, a system for normal phase chromatography.

Method and apparatus for determination of water and for normal phase liquid chromatography

A flow programmer for gas chromatography of the type having a mass flow meter for controlling the flow rate of a gas chromatography carrier gas controllable at a selected carrier gas flow rate program by an electrical input to the mass flow meter and an electrical circuit for generating the electrical input. The improvement is that the electrical circuit for generating the electrical input is an analog electrical circuit which includes an operational amplifier having an electrical capacitor in the feedback loop of the operational amplifier to produce a selected voltage input program.

Flow programmer for gas chromatography

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Midland, MI, United States of America

Jeffrey Robert Larson