NGL recovery train
Feed cooler -> flash -> compressor recycle
Compare vapor fraction, liquid recovery, compressor duty, and recycle convergence after each solve.
Flash drumCompressorRecycle
Browser-native process simulation
Build, solve, and share chemical process flowsheets.
RHEON combines a visual flowsheet canvas, rigorous thermodynamics, recycle-aware solvers, diagnostics, plots, snapshots, and collaboration tools in a polished web workspace.
- 20+
- Unit operations
- 4
- Thermo packages
- Live
- Validation
- Browser
- No desktop license
Capabilities
A simulator surface that rewards drilling into the details.
Open each capability to see the concrete app features behind the headline: solver behavior, model coverage, plotting, persistence, and collaboration affordances.
Explore capabilitiesFlowsheet authoringBuild process graphs visually with feeds, products, recycles, energy streams, and equipment blocks.Drill down
- Drag blocks onto an infinite process canvas and connect typed streams.
- Autosave versions, restore snapshots, share read-only views, and publish examples publicly.
- Inline diagnostics surface missing specs, invalid links, and convergence risks before solving.
ThermodynamicsRun ideal, cubic, and activity-coefficient property packages without leaving the browser.Drill down
- Ideal/Raoult, Peng-Robinson, SRK, and NRTL are available for vapor-liquid equilibrium.
- PT, PH, PS, and PVF flashes support stream initialization and downstream unit calculations.
- Binary T-x-y, P-x-y, and phase envelope plots help inspect phase behavior before committing a model.
Unit operation modelsModel separation, heat transfer, pressure changing, reaction, and mixing duties in one place.Drill down
- Mixers, splitters, heaters, coolers, valves, pumps, compressors, expanders, and heat exchangers.
- Flash drums, shortcut distillation, rigorous distillation, and four reactor families.
- Equipment glyphs are purpose-built for process engineers, so diagrams stay readable.
Solvers and recycle handlingUse sequential modular solving for practical flowsheets and equation-oriented solving when needed.Drill down
- Recycle detection identifies tear streams and applies acceleration to converge loops.
- Solved runs persist diagnostics, wall time, progress, and final stream/equipment results.
- Concurrency checks prevent stale writes while multiple sessions edit the same model.
These are the types of studies RHEON is built to support: phase equilibrium checks before a solve, equipment-level duties after a solve, and versioned models that can be shared or restored.
Binary separation
Ethanol-water distillation with T-x-y checks
Use phase plots before solving, then inspect stage duties, top/bottom compositions, and reboiler load.
NRTLDistillationPhase diagrams
Heat integration study
Feed preheat with epsilon-NTU exchanger rating
Iterate duty, outlet temperatures, approach constraints, and utility needs with unit switching.
Heat exchangerUtilitiesCosting
Unit library
Process equipment that reads like a flowsheet.
The glyph library makes complex process models scannable while keeping the solver connected to real unit-operation behavior.
Feed
Product
Mixer
Splitter (Tee)
Tee (3-way)
Tank / Buffer
Component Splitter
Heater
Cooler
Valve
Pump
Compressor
Expander / Turbine
Pipe
Heat Exchanger
Flash Drum
Three-Phase Flash
Decanter
Absorber / Stripper
Extractor
Conversion Reactor
Equilibrium Reactor
Gibbs Reactor
CSTR
PFR
Shortcut Distillation
Distillation Column
Sub-flowsheet
1
Sketch
Drop equipment and connect material or energy streams.
2
Specify
Choose components, thermodynamics, feed state, and equipment parameters.
3
Validate
Use warnings to catch missing degrees of freedom or impossible connections.
4
Solve
Persist run results, inspect tables and plots, then snapshot a known-good version.
Start with a model. Leave with a solved case.
Create an account to save projects, rerun simulations, inspect plots, and build a reusable library of process studies.