วีดีโอ

LDF will not work for desorption processes. For theoretical background, consult my papers R. Krishna, Highlighting the Influence of Thermodynamic Coupling on Kinetic Separations with Microporous Crystalline Materials, ACS Omega 4 (2019) 3409-3419. (doi.org/10.1021/acsomega.8b03480 ) R. Krishna, Maxwell-Stefan Modelling of Mixture Desorption Kinetics in Microporous Crystalline Materials, Sep. Purif. Technol. 229 (2019) 115790. (doi.org/10.1016/j.seppur.2019.115790 ) Krishna, R. Fundamental Insights into Intra-Crystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers. Chem Bio Eng. 2024, 1, 53-66. doi.org/10.1021/cbe.3c00057. Krishna, R. Synergistic and Antisynergistic Intracrystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers. Precision Chemistry 2023, 1, 83-93. doi.org/10.1021/prechem.2c00003. Watch also my TH-cam video Adsorption-Desorption asymmerty.

@@rajamanikrishna250 ok thank you :)

The RAST/IAST implementation in process simulations are discussed in detail in my publications (27) Krishna, R.; Van Baten, J. M. Elucidating the Failure of the Ideal Adsorbed Solution Theory for CO2/H2O Mixture Adsorption in CALF-20. Sep. Purif. Technol. 2025, 352, 128269. doi.org/10.1016/j.seppur.2024.128269. (46) Krishna, R. Highlighting the Influence of Thermodynamic Coupling on Kinetic Separations with Microporous Crystalline Materials. ACS Omega 2019, 4, 3409-3419. doi.org/10.1021/acsomega.8b03480. (47) Krishna, R. Metrics for Evaluation and Screening of Metal-Organic Frameworks for Applications in Mixture Separations. ACS Omega 2020, 5, 16987−17004. doi.org/10.1021/acsomega.0c02218. (48) Krishna, R. Synergistic and Antisynergistic Intracrystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers. Precision Chemistry 2023, 1, 83-93. doi.org/10.1021/prechem.2c00003. (49) Krishna, R. Fundamental Insights into Intra-Crystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers. Chem Bio Eng. 2024, 1, 53-66. doi.org/10.1021/cbe.3c00057

@@rajamanikrishna250 Thank you for prompt and detailed your response. All the above scenarios of implementing RAST are understandable under isothermal conditions. If there are heat effects which cannot be ignored, like in a TSA process then how do we use RAST models to cover over wide range of Pressure and Temperature?

Thermodynamic consistency tests are explained in the video presentation Thermodynamic Non-Idealities in CO2 Capture with CALF-20: Part VI available for viewing on TH-cam www.youtube.com/@rajamanikrishna250/videos

CH4/H2 can be separated using ZIF-8. See my presentation Visualizing Motion of Guest Molecules in ZIF 8

​@@rajamanikrishna250Thank you very much Sir!

The thermodynamic correction due to high pressures is derivable from the Maxwell-Stefan diffusion formulation. See the Supplementary Material accompanying my papers R. Krishna, Diffusing Uphill with James Clerk Maxwell and Josef Stefan, Chem. Eng. Sci. 195 (2019) 851-880. doi.org/10.1016/j.ces.2018.10.032 Krishna, R.; van Baten, J. M. Describing Diffusion in Fluid Mixtures at Elevated Pressures by Combining the Maxwell-Stefan Formulation with an Equation of State Chem. Eng. Sci. 2016, 153, 174-187. doi.org/10.1016/j.ces.2016.07.025.

What was the step sequence and concentration profiles in the desorption step?​@@rajamanikrishna250

What step sequence was used for the process performance? What are the concentration profiles for the desorption step?@@rajamanikrishna250

All the details are provided in the SI accompanying my paper that is available online. Krishna, R. Fundamental Insights into Intra-Crystalline Diffusional Influences on Mixture Separations in Fixed Bed Adsorbers. Chem & Bio Engineering 2024, doi.org/10.1021/cbe.3c00057.

In my presentation Entropy Production & Diffusion on this channel I write the complete expression for the rate of entropy production including viscous flow contribution. In practice, the condition of mechanical equilibrium is established much quicker than diffusion equilibrium. Consequently, it is rare to find scenarios in which we need to include viscous forces in deriving the expression for multicomponent diffusion. As example, in the process of ultracentrifugation for separation of uranium isotopes (watch my video on this topic), the assumption of mechanical equilibrium is invoked in deriving the expressions for the composition gradients within the centrifuge.

More than 200 of Dickinson's poems make reference to scientific themes including physics, astronomy, chemistry, geology, botany, physiology, medicine and psychology. She also deals with science in general terms as well as mathmatics and the appliance of science or technology (White, 1992). www.communicatescience.eu/2010/09/3-science-poems-by-emily-dickinson.html

See also Amherst college item www.amherst.edu/news/archives/classroom/node/439610

I just now arrived in Bordeaux and saw your message. I had posted a video on William Wordsworth; I am preparing one on Emily Dickinson.

It requires understanding of Non-equilibrium thermodynamics which has advanced physics concepts in general, math is just a tool here. This is at least university level of physics and maths

Send me an email

Also of possible interest are the following videos Mumbai local & the ubiquitous M-S equations Pani Puri & the ubiquitous M-S equations

r.krishna@contact.uva.nl

Please note that all my video presentations are based on my own research publications. I have examined MTT zeolite, but have not yet published anything on this zeolite. Please let me know the practical applications of MTT that you are interested in. I will then examine it in more detail.

To get infomation on the entropic contribution, we also need to examine saturation capacities, not just the pre-exponential term. See my presentation on Entropic Separations of Mixtures

Many thanks for your response. I am hoping that my design concept of shallow horizontally disposed soaker vessel without baffles or internals will be adopted by the petroleum industry. I see absolutely no merit in current vertically disposed soaker vessel designs using perforated plates to introduce staging.

send me email r.krishna@contact.uva.nl

Email me r.krishna@contact.uva.nl