Cryogenics Process Flowsheets & Simulations
Explore 9 validated, solved Cryogenics simulation flowsheets in MaximaLabs — real components: n2, methane, ethane, propane, ethylene, propylene. Open any one directly in your browser.
Solved via: PENG-ROBINSON, COOLPROP.
C3MR LNG liquefaction
A simplified APCI C3MR train: natural gas and the mixed refrigerant are precooled by a closed propane loop, liquefied to 120 K in a multi-stream main cryogenic exchanger against a closed N2/C1/C2/C3 refrigerant cycle, then let down to storage — LNG at ~115 K. Single-level precool and a single MCHE bundle (a real train uses three propane levels and two bundles); refrigerant charges are set via tear_specs.
13 unit ops • PENG-ROBINSON
17 0
View & openTwo-stage cascade (−100 °C)
Propylene + ethylene cascade: the ethylene loop condenses inside a heat exchanger against the evaporating propylene loop and serves a −100 °C load. Two coupled closed cycles. From the ChemSep casebook (Refrigeration_2-Stage-100C).
7 unit ops • PENG-ROBINSON
17 0
View & openThree-stage cascade (−150 °C)
Propylene → ethylene → methane cascade to −150 °C: each colder loop condenses against the next-warmer loop’s evaporator. From the ChemSep casebook (Refrigeration_3-Stage-150C).
10 unit ops • PENG-ROBINSON
17 0
View & openFour-stage cascade (≈−190 °C)
Propylene → ethylene → methane → nitrogen cascade reaching ≈81 K — four coupled closed loops, the full ChemSep cascade ladder (Refrigeration_4-Stage-190C). Air-separation-grade cold from stacked vapor-compression cycles.
13 unit ops • PENG-ROBINSON
17 0
View & openTEALARC LNG liquefaction
A simplified Technip TEALARC train: two closed mixed-refrigerant loops — a heavy C1/C2/C3 precool MR that also cools itself in a 4-stream exchanger, and a light N2/C1/C2/C3 liquefaction MR — bring natural gas to 120 K before letdown to storage (LNG at ~115 K). Both circulations are set via tear_specs; the precool MR runs rich for pinch feasibility (screening fidelity). From the ChemSep casebook (TEALARC).
13 unit ops • PENG-ROBINSON
17 0
View & openHelium liquefaction (Linde-Hampson cycle)
A Joule-Thomson liquefaction loop: helium is compressed, aftercooled, precooled well below its ~40-51 K JT-inversion temperature, then throttled through a valve into a flash drum that draws off liquid helium while the cold vapor recycles back to the compressor suction — the same JT-cycle physics as the platform's LNG/refrigeration loops, run on a fluid whose inversion curve makes precooling mandatory before the throttle can cool it at all.
8 unit ops • COOLPROP
17 0
View & openSnohvit mixed-fluid-cascade LNG liquefaction
A simplified Statoil/Linde MFC train: three independent, cascaded closed refrigerant loops (propane precool, an N2/methane/ethane liquefaction MR, and an N2/methane subcooling MR) each condense/precool through the previous stage's cold box before their own JT expansion -- the same cross-stage coupling TEALARC uses, one level deeper. Natural gas is cooled 300 K -> 255 K -> 175 K -> 112 K across the three multi-stream exchangers before letdown to LNG storage (~114 K). All three circulations are set via tear_specs. From the ChemSep casebook (Snohvit MFC).
17 unit ops • PENG-ROBINSON
17 0
View & openFLNG dual N2-expander liquefaction
A reverse-Brayton (turboexpander, not vapor-compression) liquefaction train — the compact, offshore-friendly FLNG alternative to mixed-refrigerant cycles like C3MR. Natural gas is acid-gas-scrubbed and mol-sieve-dried (fixed-recovery separators, the same simplification the existing carbon-capture example uses for amine treating), then cooled in two cascaded closed nitrogen loops: a warm loop precools the gas and the cold loop's own N2 charge, and a cold loop finishes the liquefaction to ~113 K in a main cryogenic multi-stream exchanger. Both loops are pure compressor + turboexpander cycles — no phase change in the refrigerant, no JT valves — the real differentiator from every other LNG example here. Single precool level and a single MCHE bundle (a real train uses more); refrigerant charges are set via tear_specs.
17 unit ops • PENG-ROBINSON
20 1
View & openCryogenic helium recovery / nitrogen rejection
A helium-rich natural gas is let down through a real isentropic turboexpander, then cascaded through two cryogenic flash stages (125 K, then 105 K) that progressively concentrate helium in the vapor while methane and nitrogen condense out. Honesty note: helium's near-infinite K-value at these conditions is numerically pathological for this solver's rigorous multi-stage column MESH (verified: even a trace of helium in a column feed reliably crashes or hangs the inside-out/Newton solvers) — so the methane/nitrogen split is modeled as a shortcut recovery-fraction separator, not a tray-by-tray column, and helium enrichment comes from cascaded flash equilibrium alone, not a true nitrogen-rejection distillation column.
11 unit ops • PENG-ROBINSON
19 0
View & open