10-8 B OEQ (Old Exam Question). The catalytic dehydration of methanol (ME) to form dimethyl ether (DME) and water was carried out over an ion exchange catalyst (K. Klusacek, Collection Czech. Chem. Commun., 49, 170 (1984)). The packed bed was initially filled with nitrogen, and at t=0. The N2 feed is switched to pure methanol vapor entering the reactor at 413K,100kPa, and 0.2cm3/s. The following partial pressures were recorded at the exit to the differential reactor containing 1.0g of catalyst in 4.5cm3 of reactor volume. 2CH3OHCH3OCH3+H2O