Process for preparing high concentration dispersions of lithium hydroxide monohydrate and of anhydrous lithium hydroxide oils
AssigneeThe Lubrizol Corporation
InventorsDavid M. Hobson, Alex F. Psaila
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Abstract
The disclosed technology relates to a dispersion comprising LiOH and/or LiOH.H2O particulates dispersed in an organic medium comprising at least one oil and at least one surfactant, the concentration of LiOH and/or LiOH.H2O particulates in the dispersion being greater than 10% by weight, the LiOH and/or LiOH.H2O particulates having a mean particle size in the range up to about 10 microns wherein at least about 99% by weight of the LiOH particulates have a particle size in the range up to about 20 microns. A process for making the dispersion is disclosed. Grease compositions made using the dispersion are disclosed.
Claims12
A process for making a dispersion comprising LiOH particulates, the process comprising:
- (A) forming a slurry consisting essentially of LiOH⊙H2O solids and an organic medium, the organic medium comprising at least one oil and at least one surfactant;
- (B) milling the slurry in a media mill to form a dispersion comprising LiOH⊙H2O particulates dispersed in the organic medium;
- (C) dehydrating the dispersion to convert the LiOH⊙H2O particulates to LiOH particulates,
- (D) mixing LiOH⊙H2O solids with the dispersion of LiOH particulates formed in (C) to form a dispersion mixture;
- (E) milling the dispersion mixture to form a second dispersion comprising LiOH and LiOH⊙H2O particulates;
- and
- (F) dehydrating the second dispersion to convert the LiOH⊙H2O particulates in the second dispersion to LiOH particulates.
A process for making grease comprising:
- (A) forming a slurry consisting essentially of LiOH⊙H2O solids and an organic medium, the organic medium comprising at least one oil and at least one surfactant;
- (B) milling the slurry in a media mill to form a dispersion comprising LiOH⊙H2O particulates dispersed in the organic medium;
- and
- (C) dehydrating the dispersion to convert the LiOH⊙H2O particulates to LiOH particulates,
- (D) mixing LiOH⊙H2O solids with the dispersion of LiOH particulates formed in (C) to form a dispersion mixture;
- (E) milling the dispersion mixture to form a second dispersion comprising LiOH and LiOH⊙H2O particulates;
- and
- (F) dehydrating the second dispersion to convert the LiOH⊙H2O particulates in the second dispersion to LiOH particulates
- mixing the dispersion with at least one carboxylic acid and/or ester thereof and at least one oil of lubricating viscosity, and reacting the LiOH particulates with the carboxylic acid and/or ester thereof sufficiently to thicken the oil of lubricating viscosity to a grease composition.
A process for making a dispersion comprising of LiOH particulates, the process consisting essentially of:
- (A) forming a slurry comprising LiOH⊙H2O solids and an organic medium, the organic medium comprising at least one oil and at least one surfactant;
- (B) milling the slurry in a media mill to form a dispersion comprising LiOH⊙H2O particulates dispersed in the organic medium;
- (C) dehydrating the dispersion to convert the LiOH⊙H2O particulates to LiOH particulates,
- (D) mixing LiOH⊙H2O solids with the dispersion of LiOH particulates formed in (C) to form a dispersion mixture;
- (E) milling the dispersion mixture to form a second dispersion comprising LiOH and LiOH⊙H2O particulates;
- and
- (F) dehydrating the second dispersion to convert the LiOH⊙H2O particulates in the second dispersion to LiOH particulates.
A process for making grease consisting essentially of:
- (A) forming a slurry comprising LiOH⊙H2O solids and an organic medium, the organic medium comprising at least one oil and at least one surfactant;
- (B) milling the slurry in a media mill to form a dispersion comprising LiOH⊙H2O particulates dispersed in the organic medium;
- and
- (C) dehydrating the dispersion to convert the LiOH⊙H2O particulates to LiOH particulates,
- (D) mixing LiOH⊙H2O solids with the dispersion of LiOH particulates formed in (C) to form a dispersion mixture;
- (E) milling the dispersion mixture to form a second dispersion comprising LiOH and LiOH⊙H2O particulates;
- and
- (F) dehydrating the second dispersion to convert the LiOH⊙H2O particulates in the second dispersion to LiOH particulates
- mixing the dispersion with at least one carboxylic acid and/or ester thereof and at least one oil of lubricating viscosity, and reacting the LiOH particulates with the carboxylic acid and/or ester thereof sufficiently to thicken the oil of lubricating viscosity to a grease composition.
Dependencies are inferred from the claim text.