Solvent hydrogenation of cottonseed oil

Abstract

Refined and bleached cottonseed oil was dissolved in a solvent (hexane, isopropyl alcohol, or di-isoproIty] ether) and was then hydrogenated in a dead-end hydrogen'ltor. Hydrogenation runs were conducted at temperatures from 115 to 145°C., at hydrogen partial i)ressures from 44 to 74 p.s.i.a., with catalyst eonecntra tlons varying, from 0.05 to 0.40% nickel, and at high rates of agitation to eliminate mqss-transfer resistances. A series of hydrogenation runs was also made ill which no solvent was used.Tile rates of hydrogenation for the v~lrious series of runs were in. the same order of magnitude but deereased in the following order: nonsolvent, hexane, isoprol)y[ ah;ohol, and di-isopropyl other runs, Selectivity and isom(;rization were low in all cases and essentially identie'd for solvent and nonsolvent runs.The rate of hydrogenation increased in all eases with higher catalyst con('entrations. For the isoprollanol runs, the reaction rate was ni3xiniuui as a function of tellillerature <It about 135°C. In the cilse of the ()flier solvents, the rate of hydrogenati(ni increased with ilwreased tOllilioratlire in the raligc froni 115 to 14,5°C., hut the r3N, illcreases of the solvellf rilns were less than lhose of the ll()li.~'.olveilt rulis.

Mixing effects in dead end hydrogenation of oils: Sulfite oxidation model

“…Mass transfer resistance corresponds here to the resistance encountered by hydrogen when diffusing from the gas space and through the liquid towards the catalyst surface. Only four investigations (1)(2)(3)(4) are known in which these resistances were substantially reduced and their conclusions should be important for evaluating the true effect of operating variables.…”

Selective hydrogenation of soybean oil: XII. Trialkyl aluminum‐copper stearate homogeneous catalysts

“…There are no tests available to ascertain whether a catalyst is homogeneous. The observed reduction in the rate of hydrogenation with the addition of 1-2% alcohol can be used as an argument in favor of soluble catalysts, because if the active catalyst species were heterogeneous, then addition of alcohols should have, if any, a promoting effect (12)(13)(14).…”

Rate and Mechanism of Hydrogenation of Cottenseed Oil in Slurry Reactors

“…Other detailed investigations of cottonseed oil hydrogenation have been reported by Albright and co-workers (Eldib and Albright, 1957;Albright et al, 1960;Wisniak and Albright, 1961). Eldib and Albright (1957) investigated the effect of operating variables in hydrogenating cottonseed oil at moderate hydrogen pressures.…”

“…These data are also analyzed and correlated here. Albright et al (1960) investigated the effect of hydrogenation of cottonseed oil with and without the presence of a solvent. Only the nonsolvent data will be considered here.…”

“…Figure 12. Chemical rate constant vs. temperature for hydrogenation of cottonseed oil: O (1), Ubbelhode and Svanoe (1919); (2), Eldib and Albright (1957); (3),Albright, Wei, and Woods (1960); V (4), Wisniak and Albright(1961); + (5), Coenen (1960) (sesame oil); X (6), This work.…”