Electrothermal Heating of Solutions

Abstract

For heating and evaporation of concentrated solutions of electrolytes, the solution itself can serve as a resistor to give uniform heating throughout. Solutions of salts having a negative temperature coefficient of solubility can be concentrated by electrical heating, provided electrodes are maintained at a temperature below that of the solution. Experimental details are given for solutions of sodium sulfate. The electrical conductivity of saturated solutions of , , , and has been determined from 25°C to 75° or 90°C.