A process simulator that runs in your browser: steady-state, pressure-driven and dynamic flowsheets, rigorous thermodynamics, and an AI copilot that builds and explains them. There is nothing to install.

Does the AI calculate the results?

No. The copilot proposes a flowsheet or a change and explains it; the deterministic solver computes every temperature, duty and composition you see. A flowsheet from the copilot that does not validate is not applied.

Will it feel familiar if I have used Aspen Plus or HYSYS?

That is the intent. The workbench has a ribbon, an All Items tree, a form for each block and the three run modes — steady state, pressure driven and dynamics — so the habits carry over.

Can it open my Aspen or HYSYS cases?

Aspen Plus .bkp and .apw, HYSYS .hsc and DWSIM files import with deterministic parsing and a report of what was recovered. A HYSYS .hsc import is partial — unit names and types, not connectivity — and the report says so.

Which thermodynamic models are included?

Peng-Robinson and SRK (including Gᴱ mixing rules), NRTL, UNIQUAC, UNIFAC, PC-SAFT, CPA, GERG-2008, electrolyte NRTL, Pitzer and the IAPWS steam tables — more than 30 property packages in all.

Yes. The Python SDK (pip install flowsim-sdk) creates, runs and reads simulations, and its results are the same objects the canvas shows.

How much does it cost?

It is free to start, with no credit card. Paid plans add higher limits and team features; the pricing page has the details.

A process simulator that runs in your browser: steady-state, pressure-driven and dynamic flowsheets, rigorous thermodynamics, and an AI copilot that builds and explains them. There is nothing to install.

Does the AI calculate the results?

No. The copilot proposes a flowsheet or a change and explains it; the deterministic solver computes every temperature, duty and composition you see. A flowsheet from the copilot that does not validate is not applied.

Will it feel familiar if I have used Aspen Plus or HYSYS?

That is the intent. The workbench has a ribbon, an All Items tree, a form for each block and the three run modes — steady state, pressure driven and dynamics — so the habits carry over.

Can it open my Aspen or HYSYS cases?

Aspen Plus .bkp and .apw, HYSYS .hsc and DWSIM files import with deterministic parsing and a report of what was recovered. A HYSYS .hsc import is partial — unit names and types, not connectivity — and the report says so.

Which thermodynamic models are included?

Peng-Robinson and SRK (including Gᴱ mixing rules), NRTL, UNIQUAC, UNIFAC, PC-SAFT, CPA, GERG-2008, electrolyte NRTL, Pitzer and the IAPWS steam tables — more than 30 property packages in all.

Yes. The Python SDK (pip install flowsim-sdk) creates, runs and reads simulations, and its results are the same objects the canvas shows.

How much does it cost?

It is free to start, with no credit card. Paid plans add higher limits and team features; the pricing page has the details.

Direct Air Capture, Calcination & Liquefaction

Two DAC pathways — a liquid-KOH contactor + rotary-kiln calciner, and a lower-temperature solid-sorbent fluidized bed with real compression heat recovery — both into genuine CO2 liquefaction, plus this platform's built-in Scope 1/2/3 carbon-footprint and Capex reporting from one click.

daccalcinationco2 liquefactionesgheat recovery

Concept

A Carbon Engineering-style DAC train: a liquid-KOH contactor captures CO2 from ambient air, causticized and precipitated pellets calcine in a real indirectly-heated rotary kiln (Arrhenius decomposition kinetics, Sullivan-Maynard-Valentine residence time), and the released CO2 is compressed and chilled into genuine subcooled liquid CO2 — not just dense-phase pipeline gas.

The math

Show the governing equations

\text{CaCO}_3 \xrightarrow{k(T)} \text{CaO} + \text{CO}_2 \quad k(T)=k_0 e^{-E_a/RT}

P_{liq} = 19.7\,\text{atm} > P_{sat,\,CO_2}(250\,\text{K}) \approx 17.8\,\text{atm}

Compressing to ~20 atm and chilling to 250 K crosses above CO2's real Span-Wagner/CoolProp saturation pressure at that temperature -- the solved outlet stream reports phase='liquid', a verifiable claim, not an assumption.

Execution

Verified Scope 1/2/3 + Capex, genuinely one click

Open the Report view on this example: Economics/Capex and Carbon/Sustainability render side by side from the same solved flowsheet, and one "Print / Save as PDF" button produces both sections in a single document — a real claim, not marketing copy. Precisely stated: this is a real, correctly-computed analysis pass over the solved result (real emission factors, not fabricated numbers) — it is not literally a field carried on every Stream/node object the way flow or temperature are; don't oversell "native on every node" beyond what that means.

The direct air capture calcination flowsheet in the MaximaLabs workbench

The example as it opens in the workbench. Click to enlarge.

Launch in MaximaLabs Workspace

A second, lower-temperature DAC pathway

Solid-sorbent DAC sorbents regenerate far below a KOH/CaCO3 loop's ~977°C calcination — this second example desorbs a loaded solid sorbent in a real fluidized bed (Wen-Yu minimum-fluidization sizing + Arrhenius desorption kinetics) at 120°C, self-swept by recycled product CO2. The desorbed gas is hot enough after compression (~780 K) that routing it through a heat exchanger against process water — instead of rejecting that heat to cooling water — genuinely converts subcooled liquid water into a boiling mixed-phase stream: real waste-heat recovery, the actual principle behind mechanical vapor recompression (MVR). Honesty note: this recovers real compression heat into a useful utility stream, but does not feed it back into the fluidized bed's own desorption duty (a fixed parameter on this unit op, not a second heating-utility stream) — a literal closed MVR loop onto the desorber itself isn't wireable with this unit op as built.

The fluidized bed dac heat recovery flowsheet in the MaximaLabs workbench

The example as it opens in the workbench. Click to enlarge.

Launch in MaximaLabs Workspace