Nitrate salt compositions comprising alkali metal carbonate and their use as heat transfer medium or heat storage medium

US9133382B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jürgen Wortmann · Weichs, DE
• Michael Lutz · Speyer, DE
• Ter Maat Johan · Mannheim, DE
• Kerstin Schierle-Arndt · Zwingenberg, DE
• Stephan Maurer · Neustadt, DE
• Michael Ladenberger · Annweiler am Trifels, DE
• Karolin Geyer · Mannheim, DE
• Florian Garlichs · Neustadt, DE

Key dates

• Filing date: Apr 10, 2013
• Grant date: Sep 15, 2015
• Expiry date: Apr 10, 2033

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K5/06
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

A nitrate salt composition comprising A) an alkali metal nitrate and optionally an alkali metal nitrite in a total amount in the range from 90 to 99.84% by weight and B)an alkali metal compound selected from the group B1) alkali metal oxide, B2) alkali metal carbonate, B3) alkali metal compound which decomposes into alkali metal oxide or alkali metal carbonate in the temperature range from 250° C. to 600° C., B4) alkali metal hydroxide MetOH, in which Met is lithium, sodium, potassium, rubidium, cesium, B5) alkali metal peroxide Met2O2, in which Met is lithium, sodium, potassium, rubidium, cesium, and B6) alkali metal superoxide MetO2, in which Met is sodium, potassium, rubidium, cesium, in a total amount in the range from 0.16 to 10% by weight, in each case based on the nitrate salt composition.