Sir,
What is your doubt? The circular has clearly stated that -
"The Apex Court has held that no duty could be demanded on the containers used for the packing of inputs, on which credit has been taken when cleared form the factory of the manufacturer availing credit as these containers could not be treated as scrap on waste arising out of the manufacturing process. Similarly, reversal of credit either on proportionate basis or otherwise is also not required as the utilization of input on which credit has been taken is not in dispute.
Accordingly, it is clarified that no duty shall be payable and no reversal of credit is also warranted on waste package /containers used for packing inputs, on which credit has been taken, when cleared from the factory of the manufacturer availing Modvat/CENVAT credit.
Therefore you can sell the empty drums without payment of duty/reversal of credit in which IPA was packed after utilizing the same in the manufacture of your final products.