Solubility determination and comparison of β-HMX and RDX in two binary mixed solvents (acetonitrile + water, nitric acid + water)

Yuehua Yao; Fan Wang; Yinguang Xu; Zishuai Xu; Lizhen Chen; Jianlong Wang

doi:10.1016/j.cjche.2023.12.016

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Solubility determination and comparison of β-HMX and RDX in two binary mixed solvents (acetonitrile + water, nitric acid + water)

Updated：2026-01-06

- Solubility determination and comparison of β-HMX and RDX in two binary mixed solvents (acetonitrile + water, nitric acid + water)
- Chinese Journal of Chemical Engineering Vol. 69, Issue 5, Pages: 238-249(2024)
- Affiliations：
  
  1. School of Chemistry and Chemical Engineering, North University of China,Taiyuan,China,030051
  2. Gansu Yinguang Chemical Industry Group Co. Ltd.,Baiyin,China,730900
- Author bio：
- Funds：
- DOI：10.1016/j.cjche.2023.12.016
  CLC：
- Published：2024
- Accepted：
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Yuehua Yao, Fan Wang, Yinguang Xu, Zishuai Xu, Lizhen Chen, Jianlong Wang. Solubility determination and comparison of β-HMX and RDX in two binary mixed solvents (acetonitrile + water, nitric acid + water)[J]. Chinese Journal of Chemical Engineering, 2024, 69(5): 238-249.
DOI：

Yuehua Yao, Fan Wang, Yinguang Xu, Zishuai Xu, Lizhen Chen, Jianlong Wang. Solubility determination and comparison of β-HMX and RDX in two binary mixed solvents (acetonitrile + water, nitric acid + water)[J]. Chinese Journal of Chemical Engineering, 2024, 69(5): 238-249. DOI： 10.1016/j.cjche.2023.12.016.

摘要

Abstract

In order to remove hexahydro-1

5-trinitro-1

5-triazine (RDX)

the main impurity

in process of polymorphic transformation of octrahydro-1

7-tetranitro-1

7-tetrazocine (HMX)

the solubility of β-HMX and RDX in acetonitrile (ACN) + water in the temperature range of 288.15-333.15 K and in nitric acid (HNO

) + water in the temperature range of 298.15-333.15 K were measured by laser dynamic method. The results showed that the solubility of both β-HMX and RDX in binary mixed solvents increased monotonously as the temperature increase at a given solvent composition or with increasing of mole fraction of solvent (ACN and nitric acid). Solubility data were well correlated by the modified Apelblat equation

Jouyban-Acree model

Yaws equation and van't Hoff equation

and the Yaws equation achieved the best fitting results according to the relative error and the mean square error root. Furthermore

the solubility of β-HMX and RDX in binary mixed solvent was compared

based on the solubility difference and the solvent's own properties

the best separation degree of β-HMX and RDX was found when the mole fraction of nitric acid was 0.22 at room temperature

which provided data support for HMX crystallization in mixed solvent. The solubility differences between RDX and β-HMX in mixed solvents were explained from the formation of intermolecular and intramolecular hydrogen bonds.

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