Magnesium oxide process
AssigneeBray Oil Company
InventorsCharles R. Dickey, Vanderveer Voorhees
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Abstract
It has been discovered that, whereas magnesium oxide of commerce, usually made by roasting hydrated magnesia, is inert to the action of CO.sub.2 and methanol, when the oxide is made by roasting magnesium carbonate at a critical temperature in the range of 600.degree.-1200.degree. F., it dissolves rapidly in anhydrous methanol under CO.sub.2 pressure, to form a methylate-carbonate. The complex can be emulsified with lubricating oil in the presence of an oil soluble surface active agent, particularly magnesium mahogany sulfonate, to produce an additive for lubricating oil having a high alkali value in the range of 100-400 mg. KOH per gram.
Claims1
In the process of preparing a colloidal dispersion of magnesium carbonate in a lower alcohol of 1 to 4 carbon atoms by the simultaneous action of magnesium oxide and CO.sub.2, the improvement comprising preparing the said magnesium oxide by roasting magnesium carbonate at a temperature of 800.degree.-900.degree. F. and cooling the resulting oxide in the absence of moisture, thereby producing an oxide having a crystal structure rendering it reactive with alcohol and CO.sub.2, then contacting said oxide with said alcohol and CO.sub.2 and a temperature of about 80.degree. to 200.degree. F. to form said colloidal dispersion.
Dependencies are inferred from the claim text.