摘要
为了解决LiB r/H_2O工质对易结晶和腐蚀性强的问题,提出了Li Br^-[BMIM]Cl/H_2O和LiB r-[BMIM]Br/H_2O新型工质对,研究了离子液体[BMIM]Cl和[BMIM]Br对LiB r/H_2O结晶温度和饱和蒸气压的影响。对质量比为2.5的LiB r-IL(ionic liquids)/H_2O的饱和蒸气压、结晶温度和腐蚀性进行了测定并与LiB r/H_2O的进行了比较,结果表明[BMIM]Cl/H_2O和[BMIM]Br/H_2O的饱和蒸气压与质量分数低8%~9%的LiB r/H_2O的饱和蒸气压基本相同。在常用工作浓度范围内,LiB r-[BMIM]Cl/H_2O的结晶温度比相同吸收能力的LiB r/H_2O的低约30℃。在相同的腐蚀条件下,LiB r-[BMIM]Cl/H_2O对碳钢的腐蚀性明显小于LiB r/H_2O,对紫铜的腐蚀性与LiB r/H_2O的基本相同。因此,采用LiB r-[BMIM]Cl/H_2O作为替代工质对具有一定的应用潜力。
In order to solve the problems of crystallization and corrosion for LiBr/H2 O, LiBr-[BMIM]Cl/H2 O and LiBr-[BMIM]Br/H2 O were proposed as new working pairs. The influences of ionic liquids on crystallization temperatures and saturated vapor pressures of Li Br/H2 O were investigated. The saturated vapor pressures,crystallization temperatures and corrosivity of Li Br-IL/H2 O with a mass ratio of 2.5 were measured and compared with that of LiBr/H2 O. The results showed that the saturated vapor pressures of [BMIM]Cl/H2 O and[BMIM]Br/H2 O were almost the same as that of Li Br/H2 O with a 8% — 9% lower concentration. In general operation concentration range, the crystallization temperatures of Li Br～-[BMIM]Cl/H2 O were about 30 ℃ lower than that of Li Br/H2 O with the same absorption ability. Under the same corrosion conditions, the corrosion rate of carbon steel for Li Br-[BMIM]Cl/H2 O was obviously smaller than that for LiBr/H2 O, and the corrosion rate of copper for LiBr-[BMIM]Cl/H2 O was nearly the same as that for LiBr/H2 O. As an alternative working pair,Li Br-[BMIM]Cl/H2 O has a great potential for absorption heat pump systems.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2016年第4期1110-1116,共7页
CIESC Journal
基金
中央高校基本科研业务费专项资金项目(FRF-TP-14-022A1)
广东省教育部产学研结合项目(2009A090100032)~~
关键词
工质对
离子液体
饱和蒸气压
结晶温度
腐蚀
working pair
ionic liquids
saturated vapor pressure
crystallization temperature
corrosion
