Gas Partition Analysis of Light Ends in Gasolines

Direct Determination of C3 to C5 Hydrocarbons in Olefinic and Nonolefinic Gasolines by Gas-Liquid Chromatography

“…These agents were coated on 30-to 60-mesh firebrick (25% by weight) and packed in a 16-foot X Vi-inch stainless steel column in the following proportions: 4 feet of di-2-ethylhexyl sebacate followed by 12 feet of tri-m-tolyl phosphate (silver nitrate-saturated). This column is a modification of one suggested by Lichtenfels et al (5).…”

“…Recently, gas chromatography has come into widespread use in determining the Cs and lighter hydrocarbons in petroleum distillates. Gas chromatographic methods for determining the isomeric hexenes and hexanes have been reported (4,5,7, 9, 12-14), but the analytical separation of some isomeric hexenes is still a problem. Very little work on the analysis of petroleum distillates for the individual C?…”

“…The few chromatographic methods advanced to date are limited in speed and versatility by the necessary addition of internal standards to the sample prior to analysis, the use of "bracketing" with mixtures of known composition, or the need for multistage columns and special equipment. Lichtenfels et al (5) used modified equipment and multiple columns. An internal standard or bracketing technique was used for quantitative measurement.…”

Calculation to Relative Molar Response Factors of Thermal Conductivity Detectors in Gas Chromatography.

“…Earlier, some authors expressed the opinion (9)(10)(11)22,23,29,31) that the use of light carrier gases like He to be analyzed. They overlooked the fact that the kinetic theory does not predict simple additivity in thermal conductivity of mixtures.…”

Gas Chromatographic Analysis of Olefinic Naphthas in Three- to Six-Carbon Range. With Aid of Subtraction Technique

“…Determination of individual components in such olefinic naphthas is exceedingly difficult because of the many closeboiling compounds present. Distillation techniques (8,10) were valuable when there was no other approach, but are time-consuming and difficult.…”