@article { author = {Mandal, Pradip and Nasir, Huda}, title = {Total Acid Number Reduction of Naphthenic Acid Using Subcritical Methanol: A Kinetic Study}, journal = {Iranian Journal of Chemistry and Chemical Engineering}, volume = {36}, number = {5}, pages = {143-148}, year = {2017}, publisher = {Iranian Institute of Research and Development in Chemical Industries (IRDCI)-ACECR}, issn = {1021-9986}, eissn = {}, doi = {10.30492/ijcce.2017.30026}, abstract = {The aim of this study is to explore the capability of subcritical methanol to reduce the acidity of naphthenic acids and to determine reaction kinetics for large-scale reactor design.The experiments were carried out in a 25 mL autoclave reactor (China) at temperatures of 70-120oC, Methanol Partial Pressures (MPPs) of 0.1-1.5 MPa, and reaction times of 0-60 min. The total acid number content of the samples was analyzed using ASTM D 974 techniques. Experimental results reveal that total acid number reduction of naphthenic acids increased with increasing reaction temperature, MPP, and reaction time. Approximately 74.20% total acid number was reduced at a temperature of 120oC, a MPP of 1 MPa, and a reaction time of 60 min. Experimental data revealed that total acid number removal reaction kinetics followed second-order kinetics with an activation energy of 11.27 kcal/mol. Therefore, subcritical methanol is able to reduce the total acid number of naphthenic acids without the addition of any catalyst.}, keywords = {Naphthenic acid,Subcritical methanol,Total acid number,Petroleum oil,Reaction kinetics}, url = {https://ijcce.ac.ir/article_30026.html}, eprint = {https://ijcce.ac.ir/article_30026_8d050423e5870e158315cebb1d81d12f.pdf} }