Question

Problem #3 (15 points) The primary process to currently make hydrogen is Steam Methane Reforming (SMR) of natural gas. This involves two reaction steps in the gas phase at high temperature & high pressure using solid catalysts. The final reactor effluent is usually separated using a PSA (Pressure Swing Adsorption) process to produce a very high-purity hydrogen gas stream & a "tail gas" containing residual methane, CO, & hydrogen (that can be used for the process's heating requirements). The table on the right shows the composition of 100 kmol/hr reactor effluent that must be purified. The separation considerations are: • The reactor effluent is cooled & free water is separated from the gas. The composition of the remaining water in the dried gas is 0.25 mol%. • The H2 Product stream is essentially pure hydrogen but only 90% of the hydrogen in the Cooled Syn Gas is recovered as product. The remaining hydrogen is recovered in the Tail Gas stream. Answer the following: • How much hydrogen is produced in H? Product [in kmol/hr]? • How much free water is produced after the initial cooling step [in kmol/hr]? • What is the composition of the Tail Gas stream [in mol%]?

          Problem #3 (15 points)
The primary process to currently make hydrogen is Steam
Methane Reforming (SMR) of natural gas. This involves two
reaction steps in the gas phase at high temperature & high
pressure using solid catalysts. The final reactor effluent is
usually separated using a PSA (Pressure Swing Adsorption)
process to produce a very high-purity hydrogen gas stream &
a "tail gas" containing residual methane, CO, & hydrogen
(that can be used for the process's heating requirements).
The table on the right shows the composition of 100 kmol/hr reactor
effluent that must be purified. The separation considerations are:
• The reactor effluent is cooled & free water is separated from the
gas. The composition of the remaining water in the dried gas is 0.25
mol%.
• The H2 Product stream is essentially pure hydrogen but only 90%
of the hydrogen in the Cooled Syn Gas is recovered as product. The
remaining hydrogen is recovered in the Tail Gas stream.
Answer the following:
• How much hydrogen is produced in H? Product [in kmol/hr]? 
• How much free water is produced after the initial cooling step [in kmol/hr]? 
• What is the composition of the Tail Gas stream [in mol%]?

Problem #3 (15 points)
The primary process to currently make hydrogen is Steam
Methane Reforming (SMR) of natural gas. This involves two
reaction steps in the gas phase at high temperature high
pressure using solid catalysts. The final reactor effluent is
usually separated using a PSA (Pressure Swing Adsorption)
process to produce a very high-purity hydrogen gas stream
a "tail gas" containing residual methane, CO, hydrogen
(that can be used for the process's heating requirements).
The table on the right shows the composition of 100 kmol/hr reactor
effluent that must be purified. The separation considerations are:
• The reactor effluent is cooled free water is separated from the
gas. The composition of the remaining water in the dried gas is 0.25
mol%.
• The H2 Product stream is essentially pure hydrogen but only 90%
of the hydrogen in the Cooled Syn Gas is recovered as product. The
remaining hydrogen is recovered in the Tail Gas stream.
Answer the following:
• How much hydrogen is produced in H? Product [in kmol/hr]?
• How much free water is produced after the initial cooling step [in kmol/hr]?
• What is the composition of the Tail Gas stream [in mol%]?

Added by Shawn A.

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