Dynamic adsorption of n-heptane/methylhexane/2,2,4-trimethylpentane and refining of high purity n-heptane on UiO-66

Equimolar ternary breakthrough experiments of n-heptane (nHEP), methylcyclohexane (MCH), and 2,2,4-trimethylpentane (224TMP) were carried out at a high hydrocarbon pressure of 10 kPa and a low hydrocarbon pressure of 0.9 kPa with varying adsorption temperature (408–498 K). Binary breakthrough experiments of nHEP/MCH and nHEP/224TMP were performed at 408 K respectively, covering the nHEP partial pressure range from 0.5 to 10 kPa (total hydrocarbon pressure maintains perpetually at nearly 10.5 kPa). The adsorption performance of No. 120 solvent oil and chemical pure nHEP on UiO-66 packed bed were investigated at 408 K. In the ternary experiments (nHEP/MCH/224TMP), the maximum selectivity of MCH/nHEP and 224TMP/nHEP are 5 and 3 respectively. The binary experiments show that increasing the nHEP partial pressure could improve the selectivity of MCH/nHEP and 224TMP/nHEP greatly. High purity nHEP (mass content of more than 99 %) will not be obtained using No. 120 solvent oil (nHEP content of 32.47 %) as raw material directly, but successfully obtained by using chemical pure nHEP (nHEP content of 97.48 %).