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Tanita Sirirat,Terdthai Vatanatham,Nanthiya Hansupalak,Garry Llewellyn Rempel,Wanvimon Arayapranee 한국화학공학회 2015 Korean Journal of Chemical Engineering Vol.32 No.5
A graft copolymerization model for using cumene hydroperoxide/tetraethylenepentamine (CHPO/TEPA) as a redox initiator was developed to describe the grafting of methyl methacrylate onto natural rubber latex as a coreshell particle. The model allows estimating the effects of the initiator concentration, monomer-rubber weight ratio, and temperature on the properties of graft product, e.g., % grafting efficiency and the % monomer composition in the graft copolymer and free polymer. The rate expressions of polymer chain formation are developed by taking into account a reduction of CHPO by TEPA and a population event of radicals between core/shell phases. The parameter estimation is performed to find the kinetic parameters. Validation with experimental results demonstrates a good applicability of the proposed model. The model results reveal that the formation of grafted polymer chains rather form by the chain transfer reaction to rubber chains from homopolymer radicals and the initiation reaction of cumyloxy radicals to rubber chains.
Cleaning of lubricant-oil-contaminated plastic using liquid carbon dioxide
Manop Charoenchaitrakool,Supaporn Tungkasatan,Terdthai Vatanatham,Sunun Limtrakul 한국공업화학회 2016 Journal of Industrial and Engineering Chemistry Vol.34 No.-
The feasibility of using liquid carbon dioxide for cleaning contaminated plastics was evaluated. Flowsheets for the CO2 cleaning processes have been conceptualized and the material and energy balanceswere conducted using ASPEN Plus. The average % lubricant oil in waste plastics was found to be 2.49%. Although the CO2 cleaning process with hexane as a co-solvent resulted in a higher cleaning efficiencythan the process without co-solvent, it consumed 2.2 times more energy. Based on cleaning 30 kg ofplastics, the operating cost of the process with hexane was 5.7 times higher than that of the processwithout hexane.