Recycle Material Balance Problem | Formaldehyde Production | Chemical Engineering

In this long video, we solve a material balance problem with recycle based on formaldehyde production from methanol, following the classical Chemical Engineering approach used in textbooks such as Felder and Rousseau.

🔹 Reaction involved:
CH₃OH → HCHO + H₂

The reactor operates with a single-pass methanol conversion of 60%, and the formaldehyde production rate is 900 kg/h.
Unreacted methanol is separated from the products, and a recycle stream is introduced back to the reactor.

📌 Topics covered in this video:

Definition of single-pass conversion
Material balance without recycle
Material balance with total recycle
Fresh feed calculation
Reactor inlet and outlet flow rates
Clear step-by-step numerical solution
Proper engineering logic (no shortcuts)

🎓 Who this video is for:
Chemical Engineering students
Mass and Energy Balance learners
University exam preparation
Beginners struggling with recycle problems

📚 Reference:
Felder, R. M. and Rousseau, R. W.,
Elementary Principles of Chemical Processes, Wiley.

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