Question

Pt 2NH3 + 3O2 + 2CH4 $\rightarrow$ 2HCN + 6H2O. Pt 2O2 + CH4 $\rightarrow$ 2CO2 + 6H2O. The reaction is conducted with excess NH3 and CH4, which completely consumes the O2. Because both reactions are highly exothermic, heat is removed from the reactor by converting water to steam. Air is used as the O2 source. The N2 in the air does not react. The HCN product is purified by a series of absorbers and strippers. First, an acid solution extracts unreacted NH3 and the by-product H2O from the product gas at 30°C. Next, the HCN is absorbed into a water solution at 20°C and the waste gas is burned as fuel. Finally, the HCN is stripped from the water solution by steam. Find at least six errors in the process flowsheet. Your errors must be distinct and unrelated. For example, if two substances are missing from a stream label, that counts as one error. Redraw your corrected PFD. Hint: Look for errors in style as well as deviations from the chemical reactions described above. Also, an absorber must have two distinct phases: a gas phase and a liquid phase (for example, air and water) or two immiscible liquids (for example, oil and water).

          Pt
2NH3 + 3O2 + 2CH4 $\rightarrow$ 2HCN + 6H2O.
Pt
2O2 + CH4 $\rightarrow$ 2CO2 + 6H2O.
The reaction is conducted with excess NH3 and CH4, which completely consumes the O2.
Because both reactions are highly exothermic, heat is removed from the reactor by converting
water to steam. Air is used as the O2 source. The N2 in the air does not react. The HCN product
is purified by a series of absorbers and strippers. First, an acid solution extracts unreacted NH3
and the by-product H2O from the product gas at 30°C. Next, the HCN is absorbed into a water
solution at 20°C and the waste gas is burned as fuel. Finally, the HCN is stripped from the
water solution by steam.
Find at least six errors in the process flowsheet. Your errors must be distinct and unrelated.
For example, if two substances are missing from a stream label, that counts as one error.
Redraw your corrected PFD. Hint: Look for errors in style as well as deviations from the
chemical reactions described above. Also, an absorber must have two distinct phases: a gas
phase and a liquid phase (for example, air and water) or two immiscible liquids (for example,
oil and water).

pt 2nh3 3o2 2ch4 rightarrow 2hcn 6h2o pt 2o2 ch4 rightarrow 2co2 6h2o the reaction is conducted with excess nh3 and ch4 which completely consumes the o2 because both reactions are highly exo 23021

Added by Tony D.

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