Excess volumes and excess heat capacities of some mixtures: (an isomer of hexanol + an n-alkane) at 298.15 K

Excess molar volumes of the mixtures hexan-2-ol + n-alkane at 298.15 K

“…In previous works where hexanol Isomers were used with different types of compounds, it can be observed that VmE,s are greater when the said compounds are mixed with secondary or tertiary aikanols than when mixed with primary akanols. This fact is also observed in works such as that of Treszczanowlcz et al (11) where results for mixtures |xC6H13(OH) + (1 -x)CnH2n+2j (from = 5 to 10), or with those obtained by Bravo et al (6) for {xC3H7CH(CH3)CH2(OH) + (1 -x)CnH2n+2)} (for n = 6, 7, 10, 14), it being evident from our results that branched aikanols produce a less negative contribution for VmE on mixing them with n-alkanes. This is due to the typical contributions appearing in these type of systems such as, on the one hand, that caused by the dipole-dipole interaction, and on the other, that caused by the effect of the aikanol's self-association.…”

Excess molar heat capacities and excess molar volumes of (propan-2-ol, or butan-2-ol, or pentan-2-ol, or pentan-3-ol, or 2-methylbutan-2-ol +n-heptane) at the temperature 298.15 K

“…8, showing a sigmoid curve although the effect is not as obvious as in the former cases. Bravo et al (6) also reported a sigmoid shape of C E p,m for (a secondary hexanol+n-hexane). Benson et al (7) measured C E p,m values for (a secondary hexanol+n-hexane) and found an inflection point which indicated a w-shaped curve for C E p,m .…”

“…Svoboda et al (17) and Bures et al (18) reported a similar trend for pure propanols to pentanols. They explained the differences in molar heat capacities of pure isomeric alkanols in terms of steric effects that disturb the formation of hydrogen bonds by (20) pentan-1-ol 208.19 (1) 190 (1) 207.45 (21) 208.3 (20) (21) 188 247.7 (22) hexan-1-ol 240.57 (1) 210 (1) 239.62 (6) hexan-2-ol 256.31 (8) 210 (8) hexan-3-ol 269.27 (8) 210 (8) 1409 CH 3 -groups in alkanols. Because the weakened hydrogen bonds formed in alkanols with a non-linear hydrocarbon chain tend to be broken more and obtain higher enthalpy H m with a change in temperature T, the derivative of enthalpy with respect to T, (1H m /1T), becomes larger.…”

Volumetric and Transport Properties of Binary Mixtures of n-Octane + Ethanol, + 1-Propanol, + 1-Butanol, and + 1-Pentanol from (293.15 to 323.15) K at Atmospheric Pressure

“…Mixtures of n -alkanes + n -alcohols are important in the chemical industry. Numerous investigations have been done in which the authors try to explain the way in which the alcohol structure is modified with the addition of n -alkanes. − This modification has been related to the partial destruction of the structure formed by the hydrogen bonding of the pure 1-alcohol during the mixing process with an n -alkane bringing a high degree of nonrandomness to the mixture …”