Kinetic Testing of Nitrate-Based Sodalite Formation Over the Temperature Range of 40 to 100 Degrees Centigrade (Final Report)

Mattus, A.J.

Oak Ridge National Laboratory

关键词: Evaporators;    Testing;    Half-Life;    37 Inorganic, Organic, Physical And Analytical Chemistry;    Kinetics;   

DOI  :  10.2172/814572
RP-ID  :  ORNL/TM-2001/117
RP-ID  :  AC05-00OR22725
RP-ID  :  814572

美国|英语

来源: UNT Digital Library

【 摘 要 】

The focus of this study was the desilication kinetics of a Savannah River Site (SRS) tank farm 2H simulant over the temperature range of 40 to 100 C. Results showed that the formation of nitrate-nitrite-based sodalite over aluminum-to-silicon (Al:Si) molar ratios ranging from 1:1 to 20:1 exhibited overall-second order kinetics. The Arrhenius apparent activation energy associated with the crystal growth process of the sodalite was determined to be 35 kJ/mol over the temperature range investigated. Second-order rate constants were extrapolated to the 2H evaporator working temperature of {approx} 130 C and were found to be 0.012 L mol{sup -1} s{sup -1}. At this operating temperature, the half-life of a limiting reactant with a 0.1 M feed would be 14 min.