1. The Department of Chemical Engineering and School of Energy & Environment, Thapar Institute of Engineering and Technology University, Patiala, organized the first international conference on "Advanced Oxidation Processes" during 21st – 23rd November 2013. Convenor: Dr. P. K. Bajpai, Co-convenor: Dr. V.K. Sangal, Organizing Secretary: Alok Garg
  2. National conference: "Advances in Chemical Engineering , AchemE-2011, Thapar Institute of Engineering and Technology University,Patiala, 27-28th February, 2011. Convenor: Dr. P. K. Bajpai, Organizing Secretary: Dr. H. Bhunia.
  3. National conference: "Advances in Chemical Engineering , AchemE-2009, Thapar Institute of Engineering and Technology University,Patiala, 27-29th February, 2009. Convenors: Dr. D. Gangacharyulu and Dr. P. K. Bajpai, Organizing Secretary: Dr. H. Bhunia, Co-ordinators: Dr. (Mrs.) S. Barman, V. K. Sangal.
  4. National conference: "Recent Trends in Polymer Science and Technology", RTPST-2005, Thapar Institute of Engineering and Technology University, Patiala, 6-7th May 2005. Co-ordinators: Dr. Rajeev Mehta, Dr. S. Sinha.