Vapor Phase Oxidation of Hexanes.

Ignition Behavior of the Hexanes

“…It was anticipated that the ignition behavior of the methylpentanes and «-hexane would be similar, judging from the findings of Cullis (2) regarding 2-methylpentane and «-hexane. It was also expected that these three hexanes should differ markedly in their ease of ignition from 2,2-dimethylbutane and 2,3-dimethylbutane when one considers the oxidation studies of Kahler, Bearse, and Stoner (12) with the hexanes.…”

Reaction Processes Leading to the Spontaneous Ignition of Hydrocarbons

“…In a number of the re-heptane runs, persistent "fogs" were obtained which could not be condensed in cold traps or in solvents (8). A quantity of this fog was collected and allowed to stand overnight in a stoppered flask.…”

Oxidation

“…Peroxides present in the hot reaction gases are decomposed by passing the gas stream in contact with packing material, such as carbon steel rings, having catalytic effect on the peroxides. Maintenance of a pH above about 4.0 in the quench liquors reduces the tendency for formation of acetals, formáis, and esters by secondary reactions (85).…”

“…Alkyl-substituted benzenes having a tertiary alkyl group and at least one nontertiary alkyl group directly substituted on the benzene ring can be selectively oxidized with molecular oxygen in the presence of suitable oxidation catalysts to produce high yields of aromatic carboxylic acids having a tertiary alkyl group on the benzene ring. Preferred catalysts are compounds of heavy metals having atomic weights in the range of 50 to 190 (85).…”

“…Oxidation of n-hexane at precool-flame temperatures (275°t o 280°C .) has been shown to give rise to formation of relatively stable organic peroxides with little hydrogen peroxide (85). Cool-flame oxidation (300°t o 400°C .)…”