2.4 Product analysis
The esterification and hydrogenation products were analyzed on an
Agilent 7890A gas chromatograph equipped with a flame ionization
detector (FID) and an HP PONA capillary column (50 m × 0.2 mm × 0.5 μm).
During the analysis, the flow rate of the N2 carrier gas
was 0.2 mL min–1. The flow rates of
H2 and air were 30 mL min–1 and 400
mL min–1, respectively. The temperatures of the
injector and FID were both 523 K. The initial temperature of the column
was set at 333 K, which was raised to 473 K at the heating rate of 5 K
min–1 and maintained for 15 min. The column
temperature was further raised to 513 K at a heating rate of 5 K
min–1 and maintained for 50 min.
On the basis of the chromatographic results, the conversion of
cyclohexene during esterification was calculated as (initial moles of
cyclohexene – moles of cyclohexene after reaction)/(initial moles of
cyclohexene) × 100%. The selectivity to cyclohexyl acetate was
calculated as (moles of cyclohexyl acetate after reaction)/(initial
moles of cyclohexene) × 100%.
The conversion of cyclohexyl acetate during hydrogenation was calculated
as (initial moles of cyclohexyl acetate – moles of cyclohexyl acetate
after reaction)/(initial moles of cyclohexyl acetate) × 100%. The
selectivity to cyclohexanol was calculated as (moles of cyclohexanol
after reaction)/(initial moles of cyclohexyl acetate) × 100%.