Agas stream consisting of 65 mole% h2, 34.5 mole% co, and 0.5 mole% ch4 is fed to a process to synthesize methanol (co + 2h2 → ch3oh). the stream from the reactor is fed to a condenser where essentially all of the synthesized methanol is condensed and all of the unreacted gases are recycled back to the reactor. to avoid a buildup of methane, a purge stream is removed from the recycle. the overall conversion of co is 85% and the methane mole fraction in the reactor inlet [n3/(n1+n2+n3)] is 0.03.1. find the amount of methanol produced by this process (n11).2. find the fraction of recycle that is purged [np/(nr+np)].

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?