Method of improving nitrate salt compositions by means of nitric acid for use as heat transfer medium or heat storage medium

US10011754B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Jürgen Wortmann · Weichs, DE
• Michael Lutz · Speyer, DE
• Johan ter Maat · Mannheim, DE
• Kerstin Schierle-Arndt · Zwingenberg, DE
• Stephan Maurer · Neustadt, DE
• Michael Ladenberger · Annweiler am Trifels, DE
• Florian Garlichs · Neustadt, DE
• Katharina Kaleta · Ludwigshafen, DE

Key dates

• Filing date: Jan 23, 2014
• Grant date: Jul 3, 2018
• Expiry date: Sep 7, 2034

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02E10/40
• WIPO field: Thermal processes and apparatus
• WIPO sector: Mechanical engineering

Abstract

Method of maintaining or widening the long-term operating temperature range of a heat transfer medium and/or heat storage medium comprising a nitrate salt composition selected from the group consisting of alkali metal nitrate and alkaline earth metal nitrate and optionally alkali metal nitrite and alkaline earth metal nitrite, wherein the nitrate salt composition is brought into contact with an additive comprising the components nitric acid and/or nitrous acid and oxygen-comprising gas having an oxygen partial pressure which is equal to or greater than that in air and/or oxygen-generating compounds and optionally nitrogen oxides and/or compounds which generate further nitrogen oxide.