Problema Tipo Unidad 2 A process for methanol synthesis is shown in figure. The pertinent chemical reactions involved are: a) (main reformer reaction) b) (reformer side reaction) c) (CO converter reaction) d) (methanol synthesis reaction) Ten percent excess steam, based on reaction (a), is fed to the reformer, and conversion of methane is 100%, with a 90% yield of CO 2 . Conversion in the methanol reactor is 55% on one pass through the reactor. A stoichiometric quantity of oxygen is fed to the CO converter, and the CO is completely converted to CO 2 . Additional makeup CO 2 is then introduced to establish a 3-to-1 ratio of H 2 to CO 2 in the feed stream to the methanol reactor. The methanol reactor effluent ís cooled to condense all the methanol and water, with the noncondensible gases recycled to the methanol reactor feed. The H 2 /CO 2 ratio in the recycle strearn is also 3-to-l. Because the methane feed contains 1% nitro gen as an impurity, a portian of the recycle stream must be purged as shown in figure to prevent the accumulation of nitrogen in the system. The purge stream analyzes 5% nitrogen. On the basis of 100 mol of methane feed (including the N 2 ), calculate: a) How many moles of H 2 are lost in the purge? b) How many moles of makeup CO 2 are required? c) The recycle to purge ratio in mol/mol. d) How much methanol solution (in kg) of what strength (weight percent) is produced.
A process for methanol synthesis is shown in figure. The
pertinent chemical reactions involved are:
a) (main reformer reaction) b) (reformer side reaction) c) (CO
converter reaction) d) (methanol synthesis reaction)
Ten percent excess steam, based on reaction (a), is fed to the
reformer, and conversion of methane is 100%, with a 90% yield of
CO2. Conversion in the methanol reactor is 55% on one pass through
the reactor. A stoichiometric quantity of oxygen is fed to the CO
converter, and the CO is completely converted to CO2. Additional
makeup CO2 is then introduced to establish a 3-to-1 ratio of H2 to
CO2 in the feed stream to the methanol reactor. The methanol
reactor effluent s cooled to condense all the methanol and water,
with the noncondensible gases recycled to the methanol reactor
feed. The H2/CO2 ratio in the recycle strearn is also 3-to-l.
Because the methane feed contains 1% nitro gen as an impurity, a
portian of the recycle stream must be purged as shown in figure to
prevent the accumulation of nitrogen in the system. The purge
stream analyzes 5% nitrogen. On the basis of 100 mol of methane
feed (including the N2), calculate:
a) How many moles of H2 are lost in the purge? b) How many moles
of makeup CO2 are required? c) The recycle to purge ratio in
mol/mol. d) How much methanol solution (in kg) of what strength
(weight percent) is produced.
