Solid-Liquid Phase Diagram of the Binary System Octadecanoic Acid and Octadecanol and the Thermal Chemical Property of the Composition at Eutectic Point

Table 2

Temperatures and enthalpies of melting of the binary system of C₁₈-acid + C₁₈-OH (from the heating scan)^a.

Mass fraction (C18–OH)	Temperature, Tp (°C)			Peak enthalpy (J·g^−1)			Total enthalpy (J·g^−1)
	First	Second	Third	First	Second	Third
0.00	52.6	—	—	203.3	—	—	203.3
0.10	50.1	—	—	193.9	—	—	193.9
0.20	48.6	—	—	223.7	—	—	223.7
0.30	47.1	—	—	183.4	—	—	183.4
0.35	45.6	—	—	157.0	—	—	157.0
0.40	44.2	—	—	198.7	—	—	198.7
0.45	45.8	—	—	171.5	—	—	171.5
0.50	47.9	—	—	213.5	—	—	213.5
0.60	49.8	—	—	200.2	—	—	200.2
0.70	51.5	—	—	213.2	—	—	213.2
0.80	53.2	—	—	203.4	—	—	203.4
0.90	55.0	—	—	43.9	138.7	—	182.6
1.00	57.2	—	—	254.6	—	—	254.6

^aThe differential scanning calorimeter was employed in the measurement with an uncertainty of ±0.01 K as well as latent heat with an uncertainly of ±0.2 J·g⁻¹.