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Liang Yinghua,Ma Peishengand Zhang Hongyan(College of Chemical Engineering, Tianjin University,Tianjin 300072)
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梁英华,马沛生,张红彦
Abstract: A method of measuring the critical temperature and pressure of thermally unstable compounds was developed,in which a thick wall borosilicate glass tube was used as sample tube,and a coated quartz glass was Supported by the Tianjin Natural Science Foundation(No.973602911). To whom correspondence should be addressed.used as heater. The advantage of the measuring apparatus was that a small amount of sample was sufficient to determine the critical properties accurately,a very short time was needed to heat the sample,and the fluid of interest could be uniformly heated. Taking n-pentane,n-hexane and 1-heptene as standard reagents,the reliability of the apparatus was checked by measuring the critical temperatures and critical pressures of these three compounds. Critical temperatures and pressures of 4 substances including dipropyl ether,allyl amine,isoamyl nitrite ester,and dimethylsulfide were measured. The low residence time (<20 s) at elevated temperature minimized decomposition and other reactions,making it possible to measure the critical properties of many unstable fluids. Except for dimethylsulfide,all data were determined for the first time.
摘要: 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 .
CLC Number:
O642
Liang Yinghua,Ma Peishengand Zhang Hongyan(College of Chemical Engineering, Tianjin University,Tianjin 300072). MEASUREMENT OF CRITICAL PROPERTIES OF THERMALLYUNSTABLE COMPOUNDS BY INSTANTANEOUS METHOD[J]. .
梁英华,马沛生,张红彦. 瞬时法测定不稳定化合物的临界温度和临界压力 [J]. CIESC Journal.
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