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research-article

Micro-calorimetric Study on the Thermal Stability of N, N-dimethylhydroxylamine in HNO3 Solution

[+] Author and Article Information
Cao Zhi

China Institute of Atomic Energy, PO.275-26, Beijing, 102413, China
caoz1020@163.com

Yan Taihong

China Institute of Atomic Energy, PO.275-26, Beijing, 102413, China
yanthcn@163.com

Bian Xiaoyan

China Institute of Atomic Energy, PO.275-26, Beijing, 102413, China
13811623465@139.com

LI Chuanbo

China Institute of Atomic Energy, PO.275-26, Beijing, 102413, China
417711593@qq.com

Zuo Chen

China Institute of Atomic Energy, PO.275-26, Beijing, 102413, China
13439212656@139.com

Zheng Weifang

China Institute of Atomic Energy, PO.275-26, Beijing, 102413, China
zhengweifangciae@yeah.net

1Corresponding author.

ASME doi:10.1115/1.4042499 History: Received August 02, 2018; Revised January 01, 2019

Abstract

The thermal stability of N, N-dimethylhydroxylamine (DMHAN) in the HNO3 solution was studied using micro calorimeter. The main influence factors included the concentration of HNO3, the concentration of DMHAN, methylhydrazine (MH), atmosphere (air and nitrogen) and metals were studied. The kinetic parameters and self-accelerating decomposition temperature (SADT) of the feed in process (reductant1BX/ scouring agent 2DS, reductant 2BX and waste aqueous phase 2DW) were calculated by AKTS (Advanced Kinetics and Technology Solutions) thermokinetics software. The molar enthalpy of formation of the reactions of NaNO2 with DMHAN, MH were also determined .The results show that the initial reaction temperature (T0) of DMHAN/HNO3 (HNO3:1.5-3.0 mol/L, DMHAN:0.05-0.8 mol/L) is improved as the acidity is reduced or the concentration of DMHAN is increased. Holding reductant MH made the induction period of the autocatalytic reaction become longer. The air, nitrogen atmosphere, Fe and the fission products (Zr, Ru) do not affect the decomposition of DMHAN, but the stainless steel made the DMHAN/HNO3 show higher reactivity. The SADT of 1BX/ 2DS, 2BX and 2DW are 56 ?, 52 ? and 47 ? respectively. The molar enthalpy of formation of the reactions of NaNO2 with DMHAN, MH is -411.3KJ/mol, -246.0 KJ/mol.

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