七种有机物质临界参数的测定

Determination of Critical Parameters of Seven Organic Compounds

用改进的开管法及Ｃｄ－Ｈｇ合金密封液设备测定了顺－１，４－二甲基环己烷、３，３－二甲基－２－丁酮、戊酸甲酯的临界温度和临界压力，而用对径直线律求取临界密度；同时测定了上述流体在高温下的蒸汽压和饱和汽液相密度。使用快速加热和时间外推法，测定了异丁醛、甲酸异丙酯、乙酸丁酯和乙酸仲丁酯的临界温度和临界压力。

Modified open-ended tube method with cadmium and mercury alloy as sealing fluids was adopted to determine the critical temperatures and pressures for cis-1, 4-dimethylcyclohexane, 3, 3-diamethyl-2-butanone and methyl valerate ,and critical density was obtained by the law of rectilinear diameter. Vapor pressures, saturated vapor and liquid densities for above fluids were measured at high temperatures. By using rapid heating and time-extension method,the critical temperatures and pressures were obtained for isobutyraldehyde, isopropyl formate,butyl acetate and sec～butyl acetate. Most of the experimental data were presented for first time.