Multiflash 7.7

Release Note

About Multiflash 7.7

Multiflash 7.7 expands KBC's thermodynamic and PVT modelling capabilities with important developments in chemical reaction modelling, electrolyte thermodynamics, CCS and hydrogen applications, model accuracy, component data, and usability.

Engineering teams increasingly need to model more than conventional hydrocarbon systems. CO2-rich fluids, hydrogen systems, saline produced waters, reactive mixtures, and petrochemical separations may all need to be evaluated within the same engineering workflow. Multiflash 7.7 addresses these challenges by extending the consistent thermodynamic foundation of Multiflash to a broader range of complex energy, chemical, and water-based systems. A major development in this release is the introduction of chemical reaction flash calculations, in which chemical equilibrium is solved together with physical phase equilibrium. This allows users to model systems where chemical reactions influence fluid and phase behaviour within the Multiflash environment. Applications include regular reaction systems, such as methanol synthesis, and selected electrolyte reactions, such as calcium carbonate precipitation.

Multiflash 7.7 also expands support for brines, salts, ions, and aqueous chemistry. These developments strengthen workflows involving scaling, corrosion, produced water, CCS, and other applications where water chemistry affects fluid behaviour. Further developments improve the treatment of CO2-rich and hydrogen-rich systems, extend the component and binary interaction parameter databases, and enhance phase-envelope calculations, PVT experiment simulation, physical property prediction, polymer modelling, model selection, and the Multiflash graphical user interface. Overall, Multiflash 7.7 provides engineers with a more comprehensive platform for modelling reactive and non-reactive systems using a consistent thermodynamic framework across reservoir, production, flow assurance, process, petrochemical, CCS, hydrogen, and water-chemistry applications.

Summary of main themes

  • Model Reactive Systems - Multiflash 7.7 introduces chemical reaction flash calculations that solve chemical equilibrium together with physical phase equilibrium. This enables engineers to model systems in which reactions influence fluid and phase behaviour, including regular chemical reactions and selected electrolyte precipitation systems, within the same thermodynamic framework.
  • Strengthen Electrolyte and Water-Chemistry Workflows - Expanded support for brines, salts, ions, aqueous species, and solid components improves the representation of complex water-based systems. These developments support engineering workflows involving scaling, corrosion, produced water, electrolyte chemistry, and saline fluids.
  • Advance CCS and Hydrogen Modelling - Multiflash 7.7 provides further improvements for CO2-rich and hydrogen-rich systems. Updated component parameters, binary interaction data, electrolyte capabilities, and hydrogen density modelling support applications across carbon capture, transport, storage, hydrogen processing, and related energy-transition workflows.
  • Improve Model Accuracy and Coverage - Updated equations of state, binary interaction parameters, component data, physical property correlations, and model options improve the accuracy and applicability of Multiflash across upstream, flow assurance, chemical, petrochemical, and process applications.
  • Optimise Engineering Workflows - Improvements to the graphical user interface, phase-envelope calculations, PVT experiment tuning, model selection, and integration capabilities make Multiflash easier to deploy across reservoir, pipeline, production, and process engineering environments.

Specific highlights for this release

  • Chemical reaction modelling
    • New reaction flash methods solve chemical equilibrium together with physical phase equilibrium using advanced flash calculation methods.
    • Reaction flash calculations are available through the Multiflash graphical user interface.
    • Support for regular equilibrium reactions, such as methanol synthesis.
    • Support for selected electrolyte reactions, including pure calcium carbonate precipitation.
    • A new Reactions tab provides access to reaction-specific flash calculations.
    • A reaction suggester can help complete missing reactions in electrolyte systems.
    • Total Enthalpy, Total Entropy, Total Volume, and Total Internal Energy specifications have been added for reaction calculations.
    • The new total-property specifications can also be used with regular flash calculations.
    • The reaction functionality is intended for equilibrium reaction systems and does not support more complex reaction mechanisms such as polymerisation.
  • Electrolyte, scaling, and corrosion developments
    • Expanded support for electrolyte reactions and aqueous chemistry.
    • Additional formation data added for Na+, K+, Ca++, Mg++, Ba++, Sr++, H+, CO3--, HCO3-, OH-, SO4--, Cl-, and Br-.
    • New ions added to the component database, including Fe++, Fe+++, Zn+++, Al+++, Mn++, Cd++, Pd++, Cu++, Li+, PO4---, NH4+, HCO2-, F-, HS-, NO2-, and NO3-.
    • The Infocond solid-component database has been extended to support reaction-flash calculations.
    • New solid components include magnesium hydroxide, barium sulphate, calcium magnesium carbonate, magnesium carbonate, strontium sulphate, and strontium carbonate.
    • The expanded electrolyte framework supports workflows involving brines, salts, scaling, corrosion, and produced-water systems.
  • CCS and hydrogen improvements
    • Further improvements have been made to the Multiflash CCS module.
    • New hydrogen volume-shift parameters improve density predictions for hydrogen mixtures at typical process conditions where hydrogen is well above its critical point.
    • The CPA water-hydrogen binary interaction parameters have been updated.
  • Model selection
    • Cubic model selection has been simplified by placing the relevant phase options under the Phases group.
    • The reorganised options include the use of high-accuracy equations of state for water and gas phases.
    • CPA-PR78 has been added as a fluid-phase option for Wax and Asphaltene models.

 

  • Thermodynamic model and binary interaction parameter updates
    • Binary interaction parameters have been updated for selected models and component pairs as part of the continuous improvement of the Multiflash model database.
    • Updated ammonia-nitrogen parameters for RKS, PR, and CPA models.
    • Updated ammonia-carbon monoxide parameters for RKS, PR, and CPA models.
    • Updated ammonia-oxygen parameters for RKS, PR, and CPA models.
    • Updated ammonia-argon parameters for RKS, PR, and CPA models.
    • Updated ammonia-methane parameters for RKS, PR, and CPA models.
    • Updated ammonia-hydrogen parameters for RKS, PR, and CPA models.
    • Updated water-hydrogen parameters for the CPA model.
    • Updated carbon dioxide-methanol parameters for the CPA model.
    • Updated carbon dioxide-glycerol parameters for RKSA-Info, PRA-Info, and CPA models.
    • Updated hydrogen-pyridine parameters for RKS and PR models.
    • Updated hydrogen-piperidine parameters for RKS and PR models.
    • Additional BIPs have been added and adjusted across the database.
    • Many missing CSMA binary interaction parameters have been added or adjusted, including pairs involving water, methanol, MEG, and other components in the Multiflash database.

 

  • New components and component-data improvements
    • N-Methyl-2-pyrrolidone, or NMP, has been added to the Multiflash component database.
    • Binary interaction parameters for NMP have been added for CPA, RKSA-Info, and PRA-Info models.
    • NMP binary interaction data are available for benzene, cyclohexane, ethylbenzene, ethane, pentane, heptane, hexane, M-xylene, O-xylene, P-xylene, octane, methylcyclohexane, methylcyclopentane, toluene, and water.
    • Furfural has been added to the list of supported components.
    • Model support for furfural includes RKS, PR, RKS-Info, PR-Info, and CPA.
    • DIPPR data have been updated to the 2025 version.
    • Ammonia parameters have been improved, including critical temperature, critical pressure, acentric factor, saturation pressure, and saturated-liquid density.
    • The enthalpy-of-vaporisation correlation for sulfolane has been improved.

 

  • Surface-tension modelling
    • The MacLeod-Sugden surface-tension model now uses pure-component saturated-liquid surface tension to determine temperature-dependent parachors.
    • This development improves predicted pure-component surface-tension values near the critical point.

 

  • SAFT and polymer modelling
    • Users can now edit segment bond fractions for co-polymers.
    • This provides additional flexibility when configuring SAFT-based co-polymer models.

 

  • PVT experiment simulation and tuning
    • The robustness of PVT experiment simulation and tuning has been improved for fluids that may form two liquid phases at lower temperatures.
    • These improvements support more reliable handling of complex fluid behaviour during PVT analysis and model tuning.

 

  • Phase-envelope calculations
    • Automatic phase-envelope performance has been improved for mixtures containing large component lists.
    • The improvements are particularly relevant where a significant number of components have zero concentration in the feed.

 

  • Graphical user interface and usability
    • The Multiflash graphical user interface has been upgraded to Qt 6.
    • The Qt upgrade improves handling of multiple monitors, screen resolutions, and display configurations.
    • The Multiflash 7.7 graphical user interface is provided as a 64-bit application.
    • Excel, Python, and other APIs can continue to use the 32-bit Multiflash engine DLL where required.
    • A new Reactions tab provides access to reaction-specific flash calculations.
    • Cubic model and phase-option selection has been simplified and reorganised.
    • Total-property specifications have been added to support reaction and regular flash calculations.

 

  • Integration and engineering workflows
    • Multiflash 7.7 continues to support consistent thermodynamic modelling across reservoir, production, pipeline, flow assurance, and process engineering workflows.
    • Petro-SIM integration has been expanded to support broader use of Multiflash calculations within process-simulation workflows.
    • API connectivity supports deployment of Multiflash thermodynamics within integrated and automated engineering applications.
    • The developments in version 7.7 help reduce inconsistencies caused by using different fluid-property methods across different stages of engineering design and analysis.

   

Why Multiflash 7.7 matters

  Multiflash 7.7 extends KBC's thermodynamic platform beyond conventional hydrocarbon systems by bringing reaction equilibrium, electrolyte chemistry, scaling and corrosion workflows, and improved CCS and hydrogen modelling into a consistent environment.   By combining reaction-aware flash calculations, electrolyte thermodynamics, advanced physical-property models, updated component data, and established flow-assurance capabilities, Multiflash 7.7 helps engineers analyse increasingly complex fluids without moving between disconnected thermodynamic tools.   The result is greater consistency across engineering workflows, improved confidence in complex-fluid calculations, and better-informed decision-making across conventional energy, chemical, petrochemical, CCS, hydrogen, and water-management applications.

  • Expanded electrolyte and aqueous-chemistry capabilities support saline and water-containing systems relevant to CCS applications.
  • These developments strengthen the modelling of CO2-rich and hydrogen-rich systems across capture, transport, storage, and process applications.