LOW TEMPERATURE EXOTHERMIC REACTION OF REILLEXTMHPQ IN NITRIC ACID

Autor:	Steven R. Walter, Edward A. Kyser, William J. Crooks
Rok vydání:	2002
Předmět:	Exothermic reaction Ion exchange General Chemical Engineering Inorganic chemistry General Chemistry Ethylbenzene Chemical reaction chemistry.chemical_compound chemistry Nitric acid Radiolysis Degradation (geology) Thermal stability Nuclear chemistry
Zdroj:	Solvent Extraction and Ion Exchange. 20:543-559
ISSN:	1532-2262 0736-6299
Popis:	Despite reports of the relative inertness of ReillexTM HPQ to chemical and radiolytic degradation, thermal stability studies in nitric acid solutions identified a low temperature exothermic reaction using the Reactive System Screening Tool (RSST). Comparative data for ReillexTM HPQ and IonacTM A-641 both show runaway behavior in nitric acid above 130˚C, but only ReillexTM HPQ had a low temperature exotherm that initiated at about 69˚C. While this exotherm is small in magnitude, gaseous products were identified, leading to concerns of pressurization within the ion exchange column. This work identifies and characterizes the low temperature exothermic reaction of ReillexTM HPQ in nitric acid, identifies ethylbenzene pendant groups as the origin of this reaction, and proposes a chemical pretreatment to eliminate it.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::9d9cc63974f98205db38001f23b96a27 https://doi.org/10.1081/sei-120014371 Zobrazit plný text záznamu