On Stream Computer Controlled Gas Chromatograph for the Analysis of Interreactor Catalytic Reformer Products

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Abstract
An on-stream gas chromatographic (GC) system has been developed to evaluate the performance of experimental reforming catalysts. The GC system analyzes a total reactor vapor phase sample obtained as the effluent from any one of the multiple reactors of the reformer chain. This interreactor sampling capability permits multiple space velocity and severity data to be obtained from one equilibrated run condition. Evaluation of reformer type processes, which use several types of catalyst in a cascading reactor configuration, is also possible. The GC system consists of four high resolution WCOT or SCOT columns in two temperature zones and two flame ionization detectors. Temperature and flow programming are used to optimize peak resolution. Up to 280 components have been identified in certain wide boiling range products. From the detailed interreactor analysis, it is possible to calculate such product properties as octane number, specific gravity, molecular weight, and vapor pressure. A comparison of interreactor effluent compositions and calculated properties with those obtained by standard mass balance methods has shown excellent agreement. The vapor phase sampling system, as well as many functions usually associated with the gas chromatographs, are controlled by a PDP-8 mini-computer system.

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