| 摘要 |
Liquid petroleum hydrocarbon blends having improved thermal stability at temperatures of 1000 DEG F. and higher are prepared by removing from the blends dissolved molecular oxygen and maintaining low levels of certain trace impurities in the blends. Trace impurity compounds that are maintained at low levels include: sulfur compounds classed as thiols, sulfides, disulfides and polysulfides; organic oxygen compounds classed as hydroperoxides, peroxides, paraffinic carboxylic acids, and phenols; nitrogen compounds classed as amides and alkyl-pyridines; and reactive olefins. Additional improvements in the blends can be obtained by providing them with a dibenzothiophene or a nitrogen compound classed as a paraffinic amine, carbazole or piperidine. The treated blends of this invention have substantially the same physical properties as similar blends that have not been so treated.
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