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Results tagged with chemical-engineering
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user 3569
Use this tag for questions within the problem domain of chemical engineering.
1
vote
Mass Transfer Question
One thing to keep in mind for mass transfer is to stay consistent when using x's and y's. You identified that this must be in the gas phase at STP, yet the equation you used has x's which represent th …
- 538
3
votes
Accepted
Discrepancy of calculated critical compressibility factor in Peng Robinson EoS
The original Peng Robinson (1976) paper has the equation rearranged in cubic form with respect to Z.
$$Z^3-(1-B)Z^2+(A-3B^2-2B)Z-(AB-B^2-B^3)=0$$
$$A=\frac{aP}{R^2T^2}$$
$$B=\frac{bP}{RT}$$
$$Z=\fra …
- 538
2
votes
Accepted
Why isn't air added to the primary reformer in ammonia production?
This report from Rice University covers design and economics of synthesis gas reformers.
Reaction 1: $CH_4+H_2O<->CO+3H_2$ (Steam reforming)
Reaction 2: $CO+H_2O<->CO_2+H_2$ (Water gas shift)
React …
- 538
13
votes
Accepted
What does "a" mean at the end of a refrigerant's designation (R-134a)?
R134a..Here "a" is used to denote that it is an isomer. R134 and R134a have same chemical formula and atomic weight but different chemical structures.
R134 has NBP of about -19 C whereas R134a has a …
- 538
1
vote
Saturation Temperature of Binary Mixture
For the ratio of methane and water use henry's law:
From NIST site: constant for methane 0.0014 mol/kg bar at 298K.
At 2000 kpa = 20 bar,
Concentration in water is 0.028 mol/kg at 298 K. At your temp …
- 538