The (T, p, x) surface of phase separation of [(1 - x)H2O + x(CH3){CH3(CH2)4}2PO] in the vicinity of the line of the lower critical solution temperatures at pressures up to 230 MPa

✍ Scribed by M.Z. Faizullin; V.P. Skripov

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 143 KB
• Volume: 26
• Category: Article
• ISSN: 0021-9614
• DOI: 10.1006/jcht.1994.1135

✦ Synopsis

The ((T, p, x)) surface of (liquid + liquid) phase equilibrium has been investigated in the vicinity of the line of lower critical solution points of (\left[(1-x) \mathrm{H}{2} \mathrm{O}+x\left(\mathrm{CH}{3}\right)\left{\mathrm{CH}{3}\left(\mathrm{CH}{2}\right){4}\right}{2} \mathrm{PO}\right]). Measurements were carried out in a high-pressure optical chamber at pressures (p) in the range from (0.1 \mathrm{MPa}) to (230 \mathrm{MPa}). The behaviour of critical exponents for ((p, x)) and ((T, x)) phaseequilibrium diagrams: (\beta_{T}) and (\beta_{p}), respectively, has been studied along the critical line and at the double critical point (DCP) with coordinates (p_{\mathrm{D}}=127 \mathrm{MPa}) and (T_{\mathrm{D}}=296.5 \mathrm{~K}). The exponent (\beta_{p}) retains its value along the line of critical points, including the double critical point; (\beta_{T}) increases anomalously with an approach to the DCP.