Conditioner for flotation of oxidized coal
AssigneeThe Dow Chemical Company
InventorRobert E. Hefner, Jr.
Life of this patent
Estimating the term…
Abstract
Condensation products of a fatty acid or fatty acid ester and a hydroxyalkylated polyalkylenepolyamine are useful as conditioners to improve the recovery of clean coal in a froth flotation process. The presence of these condensation products in the flotation medium is particularly effective to enhance the recovery of oxidized bituminous coal.
Claims8
A froth flotation process for the beneficiation of coal which comprises floating coal particles of flotation size in a frothing aqueous medium in the presence of a fuel oil collector and an effective amount of a condensation product of a fatty acid or fatty acid ester and a compound represented by the formula I ##STR4## wherein x is a whole number from 1 to 4;
- each y is independently 2 or 3;
- R at each occurrence is independently hydrogen or ##STR5## with the proviso that at least one R is not hydrogen, and wherein each T is independently hydrogen, methyl or ethyl;
- said condensation product being prepared in a molar ratio of at least about one mole of fatty acid or ester for each mole of the compound of formula I and said condensation product being employed in its free form or as an acid derivative with the proviso that a significant percentage of the compounds in the condensation product bear amide moieties.
Dependencies are inferred from the claim text.