Phase relations in the system NaCl-KCl-H2O. Part I: Differential thermal analysis of the NaCl-KCl liquidas at 1 atmosphere and 500, 1000, 1500, and 2000 bars

A simple differential thermal analysis (DTA) technique has been developed to study phase relations of various chemical systems at elevated pressures and temperatures. The DTA system has been calibrated against known melting temperatures in the system NaCl-KCl. Isobaric sections of the liquidus in the system NaCl-KCl have been determined at pressures of 1 atmosphere and 500, 1000, 1500, and 2000 bars. Using the least-squares method, the following equation was used to fit the experimental data:

$\text{T(°C)=}\text{∑}\text{i=0}\text{6}\text{a}{}_{\mathrm{i}}\text{X}{}^{\mathrm{i}}{}_{\mathrm{KCl}}$

where T is the liquidus temperature, X_KCl is mole fraction of KCl, and a_i (listed below) are the derived empirical constants.

P (bars)	$\text{a}{}_{\mathrm{o}}$	$\text{a}{}_1$	$\text{a}{}_2$	$\text{a}{}_3$	$\text{a}{}_4$	$\text{a}{}_5$	$\text{a}{}_6$
1 atm.	800.1	?334.2	781.6	?6490.3	17553.1	?17638.4	6098.3
500	813.5	?354.9	743.3	?6011.7	16406.4	?16516.3	5702.8
1000	824.5	?406.7	1446.8	?8818.4	21253.5	?20343.7	6839.4
1500	838.6	?418.7	1434.7	?8819.0	21557.9	?20908.4	7123.1
2000	848.5	?381.5	1246.9	?8605.0	21785.8	?21449.1	7375.8
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