POTASSIUM NITRATE MICROENCAPSULATION PROCESS IN A NANOSTRUCTURED INORGANIC ZINC OXIDE SHELL WITH APPLICATION IN THERMAL ENERGY STORAGE

The invention relates to micro-encapsulation process of inorganic phase change materials based on potassium nitrate in a nanostructured inorganic zinc oxide shell with applications in thermal energy storage at temperatures above 300 C. The process according this invention is characterized by the fac...

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Bibliographische Detailangaben
Hauptverfasser:	MOTOC, Adrian Mihail, ROMERO-SANCHEZ, Maria Dolores, PITICESCU, Radu Robert
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ADHESIVES BLASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY COMPOSITIONS BASED THEREON DYES HEAT EXCHANGE IN GENERAL HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS,IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT HEATING LIGHTING MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FORELSEWHERE MECHANICAL ENGINEERING METALLURGY MISCELLANEOUS APPLICATIONS OF MATERIALS MISCELLANEOUS COMPOSITIONS NATURAL RESINS ORGANIC MACROMOLECULAR COMPOUNDS PAINTS PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POLISHES THEIR PREPARATION OR CHEMICAL WORKING-UP THEIR RELEVANT APPARATUS TRANSPORTING USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS WEAPONS
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Beschreibung
Zusammenfassung:	The invention relates to micro-encapsulation process of inorganic phase change materials based on potassium nitrate in a nanostructured inorganic zinc oxide shell with applications in thermal energy storage at temperatures above 300 C. The process according this invention is characterized by the fact that the nanostructured zinc oxide shell is precipitated with potassium hydroxide on the potassium nitrate particles which are dispersed in the alcohol solution of zinc nitrate at 9.0 pH., followed by solvo-thermal treatment in an autoclave for 2 hours at 200 ° C and 40 atm. argon pressure, followed by spray-drying process of the suspensions at an air temperature of about 200 ° C inside the spraying equipment and grain sizing in the range of 20-50 µm.