Huron-Vidal Process Flowsheets & Simulations
Explore 2 validated, solved Huron-Vidal simulation flowsheets in MaximaLabs — real components: methane, co2, methanol, water. Open any one directly in your browser.
Solved via: SRK-HURON-VIDAL, PR-HURON-VIDAL.
Cold-methanol CO2 absorption at 30 bar (SRK + Huron-Vidal)
The Rectisol idea — CO₂ dissolves strongly in methanol at -35 C and 30 bar while methane does not — on the one Gᴱ-mixing package whose parameters were regressed for the rule: SRK with Huron-Vidal mixing driven by Equinor NeqSim's Apache-2.0 set (methanol/CO₂, methanol/methane fitted at infinite pressure), not by the low-pressure NRTL binaries the other Gᴱ packages borrow. 100 mol/s of 30% CO₂ gas against 150 mol/s of cold methanol: the treated gas comes out at 99.9% methane with 0.08% CO₂, the rich methanol holds 17 mol% CO₂, and a first-stage flash to 2 bar releases 6.3 mol/s of 97% CO₂ — a real Rectisol regenerates in several flash stages plus stripping, which is why this solvent still carries 14% CO₂. K-values on the package: CO₂ 0.60 at 238 K against plain SRK's 1.64 (the mixing rule is the whole difference), methane 3100. Two things worth knowing: the lean methanol carries 0.1% dissolved methane on purpose — the cubic K-value refinement collapses onto the trivial solution when a gas is seeded at the 1e-4 placeholder the Kremser absorber uses, and that K of 1 sent 27 mol/s of methane into the solvent before the seed was made physical (recorded in flowsim/solver/ as an open item); and the absorber is a Kremser stage model at the mean of the two inlet temperatures.
8 unit ops • SRK-HURON-VIDAL
1 0
View & openMethanol-water column at 10 atm (PR + Huron-Vidal)
A methanol-water column at 10 atm on Peng-Robinson with the original Huron-Vidal (1979) infinite-pressure Gᴱ mixing rule, driven by the fitted methanol/water NRTL binary. 30 mol% feed, 16 stages, reflux 2, 30% distillate: 96.2 mol% methanol overhead, 1.6% in the bottoms, 3.4 MW on the reboiler at 452 K. The point is the pressure: at 10 atm a gamma-phi activity model is at the edge of its ~10 bar envelope, and a cubic with a Gᴱ rule carries no such ceiling. Bound, as the package's own description says: Huron-Vidal wants activity parameters regressed at infinite pressure, and these are the low-pressure DECHEMA ones, so treat the split as the rule's reading of that binary rather than a validated high-pressure number (the SRK + NeqSim card is the one with parameters fitted for the rule).
4 unit ops • PR-HURON-VIDAL
1 0
View & open