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EBULLIOMETRIC DETERMINATION OF THE `INFINITE DILUTION ACTIVITY COEFFICIENT' (IDAC)

EBULLIOMETRIC DETERMINATION OF THE `INFINITE DILUTION ACTIVITY COEFFICIENT' (IDAC). TAs : Bhavin Mehta Abhishek Maheshwari Staff : V. P. Jadiyar Shaunak Dey. AIM.

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EBULLIOMETRIC DETERMINATION OF THE `INFINITE DILUTION ACTIVITY COEFFICIENT' (IDAC)

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  1. EBULLIOMETRIC DETERMINATION OF THE `INFINITE DILUTION ACTIVITY COEFFICIENT' (IDAC) TAs : Bhavin Mehta Abhishek Maheshwari Staff : V. P. Jadiyar Shaunak Dey

  2. AIM • To determine the value of the "Infinite Dilution Activity Coefficient" (IDAC) of a binary at 1 atm pressure using differential ebulliometry and the limiting slope method. • To estimate the parameters in the activity coefficients correlations such as Van Laar/Wilson.

  3. Infinite Dilution Activity Coefficient (IDAC) • Maximum deviation from ideality occurs at infinite dilution. • Indicator of the degree of the non-ideality of the solution. • Phase equilibrium calculation can be performed using IDAC. • Parameters of activity coefficient model can be determined.

  4. Theory of IDAC IDAC of ith species can be given as The following general relationship of the partial derivatives exists for the variables T,P and x1. Combining the two eqs, we get

  5. Ebulliometer • It is a device which is used for precise and simultaneous measurement of both, the bubble point of a liquid and the dew point of the vapour

  6. Procedure • Three ebulliometers are connected to a manifold and a common pressure system. • Pure solution is charged to one of the ebulliometers while rest are with very dilute solutions in range of 0 – 5 mol percent. • Set the pressure to atmospheric and switch ON heating supply.to each ebulliometer. • After temp gets steady, count the avg drop rate of condensation of vapor per min and record it against temperature. • Alter heat input by a very small amount and ensure if there any temp change occurs and also measure the drop rate as before. • For each ebulliometer obtain at least 3 – 4 sets of temperature and drop rate (drop rate should not exceed 100/min) measurement.

  7. Calculations • Plot T Vs Drop rate for each dilute solution separately. Extrapolate it to zero drop rate to get the bubble point temp of solution. • Plot T vs x1 to find the slope of the best straight line. Calculate IDAC for 1st component using this slope. • Repeat the above for other dilute (complementary experiment carried by other group). • Check for +ve or –ve deviation from Raoults law. • Determine Van Laar or Wilson’s parameters and compare with literature data, if available.

  8. Additional Information • TAs: • Abhishek Maheshwari : abhishek.maheshwari@iitb.ac.in • Bhavin Mehta : bhavinmehta@iitb.ac.in • Lab Manual is available on departmental website. http://www.che.iitb.ac.in/courses/uglab/uglabs.html • References: • Introduction to Chemical Engineering Thermodynamics, J.M. Smith, H. C. Van Ness and M. M. Abott

  9. Thank you

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