Volatility of ammonium chloride over aqueous solutions to high temperatures

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Journal of Chemical and Engineering Data; (United States)

DOI:https://doi.org/10.1021/je00011a036· OSTI ID:6045720

Palmer, D A; Simonson, J M ^[1]

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1. Oak Ridge National Lab., TN (United States)

The chemical carryover of chloride in the water/steam cycles of power plants have been correlated with the expected ammonium chloride volatility in those plants using all-volatile treatment. The partitioning of ammonium chloride from aqueous solutions to the vapor phase was measured from 120 to 350 C. The experiments were performed in a platinum-lined autoclave from which samples of the liquid and vapor phases were withdrawn for analysis by ion chromatography, and acidimetric titration. The liquid-phase pH was maintained either with an excess of hydrochloric acid or by excess ammonia in the ammonium chloride solutions. The molal thermodynamic partitioning constants for NH[sub 4]Cl were calculated from the observed liquid- and vapor-phase concentrations, taking into account the known partitioning coefficients of HCl and NH[sub 3], as well as the known mean stoichiometric activity coefficients of the ionic species in the liquid phase. The partitioning constants for NH[sub 4]Cl, NH[sub 3], and HCl are represented as simple functions of temperature and water density. Some discussion is given of the relevance of these results to modeling the transport of chloride in power plants using ammonia to control the pH of the water/steam cycle.

• OSTI ID: 6045720
• Journal Information: Journal of Chemical and Engineering Data; (United States), Vol. 38:3; ISSN 0021-9568
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
20 FOSSIL-FUELED POWER PLANTS
AMMONIUM CHLORIDES
VOLATILITY
THERMAL POWER PLANTS
WATER CHEMISTRY
AQUEOUS SOLUTIONS
CHROMATOGRAPHY
DENSITY
EXPERIMENTAL DATA
PH VALUE
SAMPLING
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0400-1000 K
THERMODYNAMIC PROPERTIES
TITRATION
WATER
AMMONIUM COMPOUNDS
AMMONIUM HALIDES
CHEMISTRY
CHLORIDES
CHLORINE COMPOUNDS
DATA
DISPERSIONS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INFORMATION
MIXTURES
NUMERICAL DATA
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
POWER PLANTS
SEPARATION PROCESSES
SOLUTIONS
TEMPERATURE RANGE
400201* - Chemical & Physicochemical Properties
200101 - Fossil-Fueled Power Plants- Cooling & Heat Transfer Equipment & Systems