Saturated vapor pressure, crystallization temperature and corrosivity of LiBr-[BMIM]Cl/H2O working pair

doi:10.11949/j.issn.0438-1157.20150230

Abstract

Abstract:

In order to solve the problems of crystallization and corrosion for LiBr/H₂O, LiBr-[BMIM]Cl/H₂O and LiBr-[BMIM]Br/H₂O were proposed as new working pairs. The influences of ionic liquids on crystallization temperatures and saturated vapor pressures of LiBr/H₂O were investigated. The saturated vapor pressures, crystallization temperatures and corrosivity of LiBr-IL/H₂O with a mass ratio of 2.5 were measured and compared with that of LiBr/H₂O. The results showed that the saturated vapor pressures of [BMIM]Cl/H₂O and [BMIM]Br/H₂O were almost the same as that of LiBr/H₂O with a 8%—9% lower concentration. In general operation concentration range, the crystallization temperatures of LiBr-[BMIM]Cl/H₂O were about 30℃ lower than that of LiBr/H₂O with the same absorption ability. Under the same corrosion conditions, the corrosion rate of carbon steel for LiBr-[BMIM]Cl/H₂O was obviously smaller than that for LiBr/H₂O, and the corrosion rate of copper for LiBr-[BMIM]Cl/H₂O was nearly the same as that for LiBr/H₂O. As an alternative working pair, LiBr-[BMIM]Cl/H₂O has a great potential for absorption heat pump systems.

Key words: working pair, ionic liquids, saturated vapor pressure, crystallization temperature, corrosion

摘要：

为了解决LiBr/H₂O工质对易结晶和腐蚀性强的问题,提出了LiBr-[BMIM]Cl/H₂O和LiBr-[BMIM]Br/H₂O新型工质对,研究了离子液体 [BMIM]Cl和[BMIM]Br对LiBr/H₂O结晶温度和饱和蒸气压的影响。对质量比为2.5的LiBr-IL(ionic liquids)/H₂O的饱和蒸气压、结晶温度和腐蚀性进行了测定并与LiBr/H₂O的进行了比较,结果表明[BMIM]Cl/H₂O和[BMIM]Br/H₂O的饱和蒸气压与质量分数低8%~9%的LiBr/H₂O的饱和蒸气压基本相同。在常用工作浓度范围内,LiBr-[BMIM]Cl/H₂O的结晶温度比相同吸收能力的LiBr/H₂O的低约30℃。在相同的腐蚀条件下,LiBr-[BMIM]Cl/H₂O对碳钢的腐蚀性明显小于LiBr/H₂O,对紫铜的腐蚀性与LiBr/H₂O的基本相同。因此,采用LiBr-[BMIM]Cl/H₂O作为替代工质对具有一定的应用潜力。

关键词: 工质对, 离子液体, 饱和蒸气压, 结晶温度, 腐蚀

CLC Number:

TK01⁺9

LUO Chunhuan, ZHANG Yuan, SU Qingquan. Saturated vapor pressure, crystallization temperature and corrosivity of LiBr-[BMIM]Cl/H₂O working pair[J]. CIESC Journal, 2016, 67(4): 1110-1116.

罗春欢, 张渊, 苏庆泉. LiBr-[BMIM]Cl/H₂O工质对的饱和蒸气压、结晶温度和腐蚀性[J]. 化工学报, 2016, 67(4): 1110-1116.

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Saturated vapor pressure, crystallization temperature and corrosivity of LiBr-[BMIM]Cl/H₂O working pair

LiBr-[BMIM]Cl/H₂O工质对的饱和蒸气压、结晶温度和腐蚀性

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