Method of making molded blocks
AssigneeEmerson Electric Co.
InventorPaul V. Henton
Life of this patent
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Abstract
A method of molding porous cores or barrier materials for filtering, drying and removing acids from refrigeration or air conditioning systems includes mixing active solid ingredients in a nominal fully activated condition with a modified phosphate binder, immediately molding the mixed "desiccant" and binder into a desired shape, ejecting the green formed unit, and drying and firing the unit.
Claims2
A molded porous shape for use as a core for filtering, drying and removing acids from refrigeration systems and the like comprising at least one solid particulate desiccant taken from the group consisting of crystalline zeolite molecular sieve, activated alumina, and activated alumina gel, the type and amount of desiccants being determined by the desired water and acid capacity of the core, and a modified aluminum phosphate binder comprising the reaction product of phosphoric acid and aluminum hydroxide plus at least one of a group consisting of oxides and hydroxides of calcium, magnesium, zinc, strontium, antimony, lead, iron and cadmium, said binder containing a ratio of equivalents of aluminum to the said other metals in the range of 0.70 - 2.90 to 1, and a ratio of total metal equivalents to mole equivalents of phosphoric acid in the range of 1.00 - 1.80 to 1.
A process for making porous molded shapes for use as cores for filtering, drying and removing acids from refrigeration systems, which comprises mixing nominally fully activated desiccant taken from the group consisting of crystalline zeolite molecular sieve, activated alumina, and activated alumina gel, with an aqueous solution of a modified aluminum phosphate binder, said binder being the product of the controlled reaction of phosphoric acid and an aqueous slurry containing aluminum hydroxide plus at least one of a group consisting of oxides and hydroxides of calcium, magnesium, zinc, strontium, antimony, lead, iron and cadmium, said binder containing a ratio of equivalents of aluminum to the said other metals in the range of 0.70 - 2.90 to 1, and a ratio of total metal equivalents to mole equivalents of phosphoric acid in the range of 1.00 - 1.80 to 1, molding the mixture to form a green shape, and thereafter firing the shape to activate the desiccants of said molded porous shape.
Dependencies are inferred from the claim text.