Abstract
A variable-volume cell was designed, built and validated to measure the solubility of salts in liquid ammonia, using a polythermal method at high pressure. The apparatus is based on a cell made of stainless steel and fitted with a sapphire window to allow the solubility process to be visually controlled. The solubility of three systems was measured: lithium nitrate in water at atmospheric pressure, lithium nitrate in ammonia at 20bar and sodium thiocyanate in ammonia, also at 20bar. An image processing treatment was also tested as a new procedure for detecting the solubility temperature.
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