Layered divalent metal hydrogen phosphates
AssigneeMobil Oil Corporation
InventorsClarence D. Chang, Stuart D. Hellring
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Abstract
Layered divalent metal hydrogen phosphate, MHPO.sub.4.nH.sub.2 O wherein M is a Group IIA or Group IIB element and n ranges from about 0 to 2, is prepared by hydrothermal treatment of an aqueous mixture containing a source of metal oxide, a source of phosphorus oxide and a source of hydrogen atoms, said aqueous mixture having an initial pH ranging between about 3 and 10.
Claims12
A layered magnsium hydrogen phosphate composition having the empirical formula MgHPO.sub.4.nH.sub.2 O, wherein n ranges from 0 to 2, and having a d-spacing of at least about 8 angstroms.
A method for preparing a layered magnesium hydrogen phosphate composition, MgHPO.sub.4.nH.sub.2 O wherein n ranges from 0 to 2 which comprises hydrothermally treating an aqueous mixture having an initial pH prior to said treatment ranging from about 3 to 10 and containing a source of Mg, a source of phosphorus, a source of oxygen, a source of hydrogen, and having a molar ratio of Mg:P of about 0.8 to 1.2, wherein said source of Mg is selected from the group consisting of magnesium oxide and magnesium hydroxide, and wherein said hydrothermal treatment conditions include a temperature ranging between about 100.degree. to 250.degree. C., a pressure ranging between about 100 to 350 kPa, and a contact time ranging between about 10 to 84 hours.
A method of sorbing water which comprises contacting a layered magnesium hydrogen phosphate having the empirical formula MgHPO.sub.4 --nH.sub.2 O, wherein n ranges from 0 to 2, and a d-spacing of at least about 8 angstroms, with a water-containing material under conditions which allow the sorption of water from said water-containing material to said layered magnesium hydrogen phosphate.
Dependencies are inferred from the claim text.