Experimental Study on Thermophysical Property of Deep Eutectic Solvents as Heat Transfer Fluid

Deep eutectic solvents are now widely used in metal electrochemical deposition, biomass catalysis and material synthesis because of their advantages of greenness, low cost, good biocompatibility and biodegradability. In this work, eight DESs were prepared by heating and stirring method using choline chloride as the hydrogen bond acceptor and glycerol, polyethylene glycol 600, lactic acid and o-cresol as the hydrogen bond donor. The flow calorimetry specific heat capacity system was examined, and the maximum deviation of the experimental value and the standard value of the specific heat capacity of deionized water under the pressure 101 kPa was 2.03%, and the average absolute deviation was 1.01%, and the repeatability was less than 1.5%. Then, the densities and the constant pressure specific heat capacities of eight DESs in the temperature range of 293K~353K and 293K~373K were measured respectively.