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设计、安装了一套测定不稳定化合物的临界温度 (Tc)和临界压力 (pc)的毛细管瞬时法装置 ,以正戊烷 (n -C5H1 2 )、正己烷 (n -C6H1 4 )和 1 -庚烯 (1 -C7H1 4 )为标准试剂对装置的可靠性进行了校验 ,并测定了亚硝酸异戊酯、二烯丙基醚、二甲硫醚和烯丙基胺等 4种物质在不同停留时间 (τ)下的表观临界温度 (Tc,a)和表观临界压力 (pc,a) .停留时间最长为 2 0s,有效地控制了被测流体的热聚合和热分解 .采用线性外推方法得到了这些物质的Tc 和 pc.所有的数据除二甲硫醚外均为首次测定 .
A set of capillary instantaneous method was set up for the determination of the critical temperature (Tc) and the critical pressure (pc) of unstable compounds. The n - pentane (n -C5H1 2), n - Heptene (1 -C7H1 4) was used as the standard reagent to verify the reliability of the device. And four kinds of substances, isoamyl nitrite, diallyl ether, dimethyl sulfide and allylamine, were determined. Apparent critical temperature (Tc, a) and apparent critical pressure (pc, a) at different residence time (τ), the longest residence time is 20s, which can effectively control the thermal polymerization and thermal decomposition of the tested fluid. The Tc and pc of these materials were obtained by linear extrapolation, with all data except for dimethylsulfide being the first determination.