Accurately estimating distillation column efficiencies is critical for optimal column design and operation. Binary test systems that have historically been used to collect efficiency data often suffer from physical property inconsistencies during the efficiency measurements that translate into poor correlation development and tower design. In order to address this issue, this project implemented an Oldershaw column to obtain mass transfer efficiency data for a new test system, cyclohexane/methyl cyclohexane (CH/MCH). The physical properties of this new test system remain more consistent across the column height compared to the similar, more widely used test system, cyclohexane/n-heptane (CH/nC7). Though often used in distillation efficiency experiments because of the similarity in boiling points of cyclohexane and n-heptane, this test system experiences significant property changes that affect the accuracy of the point efficiency measurements. Data will be presented over a range of pressures and operating conditions to better understand the utility of this new test system in evaluating column efficiencies.
