微流量调节阀在液体饱和蒸气压测定实验中的应用

doi:10.3866/PKU.DXHX202107062

Abstract

Abstract:

A micro-flow regulating valve was introduced into an experimental device used for liquid vapor pressure measurements, to enable the accurate and control of the pressure of the system and address the problem of backward air flow into the experimental system. Desirable results were obtained in the experimental process with the use of the micro-flow regulating valve in the experimental device.

Key words: Physical chemistry experiment, Micro-flow regulating valve, Molar heat of vaporization, Static method

Shuai Zhang, Jian Zhang, Shaowei Bian, Yaping Zhao, Li Shen, Chunying Xian. Application of a Micro-Flow Regulating Valve in Saturated Vapor Pressure Measurements[J].University Chemistry, 2022, 37(6): 2107062.

Figures/Tables 8

References 10

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实验完成情况	实验装置改进前	实验装置改进后
调节b、c管液面平衡一次成功率	< 25%	> 90%
发生空气倒灌比例	> 60%	< 5%
整体完成实验时间	3–4 h	2–3 h
乙醇平均摩尔汽化热值误差在±5%内比例	~10%	~70%
乙醇平均摩尔汽化热值误差在±10%内比例	~20%	~90%

编号	沸点t/℃	沸点T/K	10³T^?1/K^?1	压力差Δp/kPa	蒸气压p =大气压+ Δp/kPa	ln(p/kPa)
1	30.04	303.04	3.298	?90.76	10.78	2.378
2	34.11	307.11	3.256	?88.24	13.30	2.588
3	38.07	311.07	3.213	?85.17	16.37	2.795
4	42.08	315.08	3.172	?81.44	20.10	3.001
5	46.01	319.01	3.133	?77.00	24.54	3.200
6	50.00	323.00	3.095	?71.82	29.72	3.392
7	53.97	326.97	3.057	?65.65	35.89	3.580

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Application of a Micro-Flow Regulating Valve in Saturated Vapor Pressure Measurements

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