Hydrocarbon Mixtures and Refrigerants

Many gas processing and hydrocarbon cracking and petroleum processing plants have large quantities of hydrocarbon mixtures (such as propane-butane, propane-propylene, ethylene-ethane, ethylene-propylene, etc.) available and these mixtures can be used as refrigerants in properly designed systems. For proper operation of the compressor, condenser, and evaporator in these systems, it is extremely important to maintain uniform compositions (avoiding leaks and random make-up additions of hydrocarbon) and to use only two hydrocarbons in the refrigerant mix, rather than three or more; as the operation can become quite complicated otherwise. Even for a mixture high in composition of one component, say propane at 90 ...

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