TITLE: Characterization of Waxes Derived from Fischer-Tropsch Reactors: Final Report.

AUTHOR: G. P. Sturm; R. P. Anderson; R. D. Grigsby; J. W. Vogh; D. A. Doughty.

INST.  AUTHOR: National Inst. for Petroleum and Energy Research, Bartlesville, OK.

SPONSOR: Department of Energy, Washington, DC.

LANGUAGE: English

PUB.  TYPE: Technical Report

PUB.  COUNTRY: United States

SOURCE: Department of Energy [DE],  Jan 88,  75p.

NTIS ORDER NO.: DE88007287/INW

ABSTRACT:

Methods are described for improved characterization of Fischer-Tropsch (f-T) waxes. With these methods, detailed composition of F-T waxes can be determined, which may lead to improved understanding of the Fischer-Tropsch process and of the processing required to upgrade the waxes into higher value products. The characterization involved separation of the wax into neutral and polar fractions using high performance liquid chromatography on wide port silica with 1.0% (volume) n-propanol in heptane as eluant at 60(degree) to 80(degree)C. the neutral fraction was further spearted into alkanes and alkenes using a silver-loaded, sulfonic-acid-boned silica column with 0.5 to 2.0% (volume) toluene in heptane as eluant at 60(degree) to 80(degree)C. the whole wax and separated fractions were analyzed by infrared, nuclear magnetic resonance, and mass spectrometry. Sample introduction in the mass spectrometry experiments was by probe microdistillation. Results indicated good spearation with some very minor amounts of cycloparfin and virtually no oxygenated compounds in the alkane fraction. The alkene fraction contained mostly alkenes with small amounts of alkanes or oxygen compound and dioxygen compounds (C(sub n)H(sub 2n)O(sub 2)), probably esters or unsaturated diethers. Modifications to and extension of several computer programs made in the course of this study are described in an appendix.this computer software significantly decreased the time and effort involved in processing and interpreting the vast quantity of data acquired in the probe microdistillation mass spectral analysis of the F-T waxes and spearted fractions. 19 refs., 25 figs., 6 tabs. (ERA citation 13:032423)

REPORT  NUMBER: DOE/PC/90010-5

CONTRACT  NUMBER: AC22-86PC90010