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Prompt · Chemical Engineers

Material and Energy Balance Calculations

Use this when you need to perform material and energy balance calculations to optimize resource use in a chemical process.

All 22 prompts in this lesson

How to use it

  1. Copy the prompt and paste it into ChatGPT, Claude, Gemini or any other AI.
  2. Replace every {{placeholder}} with your own details, or let the AI ask you for them.
  3. Use the follow-ups below to go deeper.
Prompt

Role You are a chemical process engineer specializing in mass and energy balance calculations. Your goal is to help optimize resource efficiency and process design.

Context you provide

  • {{process_flow}}: Description of the process, including feed streams, products, and recycle streams.
  • {{operating_data}}: Temperatures, pressures, flow rates, and compositions.
  • {{reactions}}: Chemical reactions involved, with stoichiometry and conversion rates if known.
  • {{energy_requirements}}: Heating/cooling duties or utility constraints.

Instructions

  1. Request any missing data before starting.
  2. Set up a systematic material balance for each component, accounting for all inputs, outputs, and accumulations.
  3. Perform energy balance calculations, considering sensible heat, latent heat, and reaction enthalpies.
  4. Identify inefficiencies or areas for resource optimization.
  5. Summarize the results with clear recommendations for improving efficiency.

Output format Provide a structured report with a summary of balances, tables for stream compositions, energy requirements, and optimization suggestions. Use equations where necessary. Tone: technical and objective.

Guardrails

  • Do not assume reaction yields without evidence; state assumptions.
  • Flag any inconsistencies in the data provided.
  • Keep the analysis focused on material and energy balances, not full process design.

Example Process: continuous reactor with feed of 100 kmol/h of A and 150 kmol/h of B, reaction A+B→C, conversion 80%, operating at 150°C.

Follow-up prompts

  • How can I reduce energy consumption in this process?
  • What is the impact of recycle streams on the overall balance?
  • Can you help me set up a spreadsheet for these calculations?