该项目旨在确定和量化从制冷剂11系统、制冷剂12商业制冷系统、制冷剂22空调和热泵以及制冷剂502低温冷冻食品箱中获得的使用过的制冷剂样品中的典型污染物水平。取样系统的运行条件从正常运行系统（最低制冷剂污染）到需要最低维修的系统（平均制冷剂污染），再到电机烧毁的系统（严重制冷剂污染）。对获得的制冷剂样品进行水、酸、高沸点残留物、挥发性杂质和颗粒物含量分析。 然后根据所用制冷剂中存在的污染水平和类型配制合成制冷剂。使用合成制冷剂对制冷剂回收技术进行了初步评估。这项研究的结果将作为建立质量标准的第一步，用于评估当前和未来的回收设备和技术。

This project was performed to identify and quantify the typical contaminant levels in used refrigerant samples obtained from Refrigerant 11 systems, from Refrigerant 12 commercial refrigeration systems, from Refrigerant 22 air conditioners and heat pumps, and from Refrigerant 502 low temperature frozen food cases. The operating conditions of the sampled systems ranged from normal operating systems (minimal refrigerant contamination) to systems requiring minimal repair (average refrigerant contamination) to systems experiencing motor burnouts (severe refrigerant contamination). The obtained refrigerant samples were analyzed for water, acid, high boiling residue, volatile impurity and particulate contents. Synthetic refrigerants were then formulated based on the levels and types of contamination present in the used refrigerants. The synthetic refrigerants were used to make a preliminary evaluation of refrigerant recycling techniques. The results of this research will be used as the initial step in establishing quality standards for evaluating present and future recycling equipment and techniques.