Abstract: Methods and apparatus for analyzing a hydrocarbon sample are provided. The apparatus employs a highly polar column to separate the aromatics from non-aromatic components. The non-aromatic effluent from the highly polar column is passed to a 13X MSCOT column and a first less polar column. In a second configuration the highly polar column is backflushed into a second less polar column. The 13X MSCOT column separates isoparaffins, normal paraffins, and naphthenes by carbon number while the first less polar column individually separates the paraffins and naphthenes. The second less polar column is employed to separate individual aromatics.The method for analyzing a hydrocarbon sample separates the aromatics of the sample from the isoparaffins, normal paraffins, and naphthenes. The isoparaffins, normal paraffins, and naphthenes are then separated and detected by carbon number. Simultaneously, the individual non-aromatic components are separated and detected.

Abstract: An apparatus for analyzing a hydrocarbon sample comprising paraffins, naphthenes and aromatics. The subject apparatus comprises means for providing a sample, a polar column, a 13X molecular sieve coated open tubular column, a nonpolar stationary phase column, a valve means, detection means and means for supplying gas.

Abstract: A system for controlling the addition of small amounts of material to process using the loss-in-weight method. The system uses digital control in combination with an on-off solenoid valve whose on time can be varied to meter the material uniformly at low rates.

Abstract: A method of fabricating an elution chromatography separating column from an elongated capillary tube, such column having a layer comprising a plurality of disunited particles of porous solid material disposed on an inner surface of the tube. The method comprises the steps of: preparing a suspension comprising a dispersive liquid and particles of the solid material; filling an elongated capillary tube with prepared suspension; and flowing an inert gas through the tube to dry the tube thereby leaving a layer comprising a plurality of disunited particles of the solid material attached to the inner surface of the tube.