Molecule Simulator vs ProcessChem

This app is a molecular viewer. With the data on PubChem and Protein Data Bank, it can show us 3D structure of molecules. Both space filling mode and ball-and-stick mode. --------------------------------------------- Contains some pre-installed modes. And you can download all kinds of molecules from PubChem or Protein Data Bank.

ProcessChem puts a chemical engineer's property tables, equation-of-state solvers, and unit-operation calculators in your pocket — no spreadsheet, no lookup binder, no internet connection required. PROPERTY LOOKUPS Pull density, viscosity, thermal conductivity, heat capacity, vapor pressure, heat of vaporization, compressibility factor, and surface tension for thousands of pure chemicals and mixtures. Hazard and safety data included: flash point, flammability limits, exposure limits, and carcinogen/GWP/ODP flags. Also covers five common polymers (HDPE, LDPE, PP, PET, PVC) by repeat-unit mass, for property lookups and the Heater case. PHASE EQUILIBRIUM & FLASH CALCULATIONS Run flash calculations across any two-property target — temperature, pressure, enthalpy, entropy, internal energy, or volume — to find the resulting phase state and composition. Powered by CoolProp's reference-quality equations of state for over 100 fluids, with a Peng-Robinson backend covering the rest. REACTIONS & EQUILIBRIUM Balance chemical reactions automatically, track excess reagent and conversion, and run full energy balances. A dedicated equilibrium solver finds multi-species reaction composition at any temperature and pressure. An electrochemistry mode computes cell voltage and electron balances for electrolysis and battery chemistry. MULTI-COMPONENT MIXTURES Peng-Robinson with ChemSep binary interaction parameters, bubble/dew point calculations, and per-component hazard data — across every mode in the app. PROCESS ENGINEERING CASES - Heater: heats or cools a batch or stream at constant pressure — give a final temperature and get the duty, or give a duty and get the temperature reached, melting and boiling included - Vessel Heater: a sealed, rigid vessel heated or cooled — finds the resulting pressure, phase and liquid level, and flags the liquid-full overpressure hazard - Fluidized Bed: finds the minimum fluidization and blow-out velocities for your gas rate and the resulting pressure drop, with reacting-bed conversion and composition in both batch and continuous-flow modes - Heat Exchanger: two streams exchange heat — give the duty or one outlet temperature and it finds the rest, refusing any pairing that would need heat to flow backwards UNITS, YOUR WAY A dedicated Units tab lets you pick your preferred unit for every quantity in the app, with a configurable Normal/Standard reference for gas-volume conversions. Save any calculation to a file in Files or iCloud Drive, so your work survives even if you delete the app. Built for process, chemical, and plant engineers, students, and anyone who needs a real thermodynamic answer faster than a lookup table can give one.