Quick Recap

MSubbu outlined the class schedule for the upcoming week, introduced Karthikeyan, and discussed the day's agenda, which included problems on humidification, crystallization, and extraction. The discussion focused on solving problems related to fuel combustion, flue gas analysis, and the removal of hexane from a gas mixture by condensation, emphasizing the importance of understanding concepts like saturation, condensation, and vapor pressure. MSubbu also discussed the availability of additional study materials, the importance of regular attendance and participation in Friday evening discussion sessions, and advised students to maintain a log of their study time.

Next Steps

  • Students to spend regular time studying and practicing process calculations concepts.
  • Students to maintain a log of their study time and activities.
  • Karthikeyan to lead the peer discussion session on Friday from 7-8 PM.
  • Students to attend the peer discussion session on Friday.
  • MSubbu to post the problems for the next class by Monday.
  • Students to attempt solving problems before watching the solutions.
  • MSubbu to arrange for verification of students' test workouts by a team.
  • Students to take and upload snapshots of their test workouts.
  • MSubbu to post the recorded class video by 11 AM the next day.
  • MSubbu to process and post timestamps for the class videos.

SUMMARY

Upcoming Class Schedule and Peer Discussions: MSubbu outlines the class schedule for the upcoming week, including Sunday classes from 9:30 to 10:30 AM, and Tuesday and Thursday classes from 7 to 8 PM. He introduces Karthikeyan, a recent SSN graduate, who will lead peer discussion sessions on Fridays from 7 to 8 PM. MSubbu discusses the day's agenda, which includes problems on humidification, crystallization, and extraction. He mentions that class videos will be posted by 11 AM the next day, with timestamps for easy navigation. MSubbu also reminds students to take pre-assessment tests and informs them about upcoming thermodynamics classes starting the following Thursday.

Solving Fuel Combustion and Flue Gas: The discussion focuses on solving a problem related to fuel combustion and flue gas analysis. MSubbu explains that the problem involves a fuel mixture of propane and butane, with incomplete combustion resulting in carbon monoxide and unburned fuel in the flue gas. The key to solving the problem is using the dew point temperature of the exit gas to determine the water vapor content. MSubbu emphasizes that the dew point temperature is used instead of directly reporting water vapor content because water is the only condensable component in the flue gas. By using the dew point temperature and vapor pressure data, they can calculate the mole fraction of water in the leaving gas. This information, along with the given composition of other components, will allow them to solve for the original fuel composition.

Solving Combustion Problem With Atomic Balances: The discussion focuses on solving a combustion problem involving propane and butane. MSubbu explains how to use atomic balances for carbon and hydrogen to set up equations with unknowns for the moles of propane (n1), butane (n2), and water (W). He demonstrates how to calculate the water content using the dew point temperature data. MSubbu compares this method to the extent of reaction approach, which would result in more variables and equations. He concludes that the atomic balance method is more straightforward for this problem.

Hexane Removal by Condensation Calculation: The discussion focuses on a problem involving the removal of hexane from a gas mixture by condensation. MSubbu explains how to calculate the molar flow rate from the given volumetric flow rate using the ideal gas equation. He then demonstrates how to determine if the gas is saturated by calculating the relative saturation. The problem requires finding the temperature at which condensation begins and the temperature needed to remove 80% of the hexane. MSubbu emphasizes the importance of understanding concepts like saturation, condensation, and vapor pressure in solving such problems.

Crystallization and Extraction Problems: The instructor discusses crystallization and extraction problems in chemical engineering. He explains how to solve a problem involving sodium sulfate crystallization, focusing on material balances and yield calculations. The instructor then covers an oil extraction problem from mustard seeds using hexane, demonstrating how to calculate oil recovery percentage. Finally, he briefly introduces a problem about reporting potassium content in fertilizers, explaining how potassium chloride (KCl) is expressed in terms of K2O equivalent. Throughout the session, the instructor emphasizes the importance of material balances and provides step-by-step problem-solving approaches.

Study Materials and Class Schedule: MSubbu discusses the availability of additional study materials, including previous year's class recordings and problem sets. He encourages students to attempt solving problems independently before looking at solutions. MSubbu announces that Karthikeyan will lead Friday evening discussion sessions, emphasizing the importance of regular attendance and participation. He also mentions that students should submit their problem-solving work for verification. MSubbu concludes by discussing the upcoming class on energy balance and advising students to maintain a log of their study time.

Last modified: Monday, 2 June 2025, 9:43 AM