solvent refining meaning in Hindi

The current production facilities of Bashneft Novoil include primary oil refining, hydrotreatment, reforming and iso-reforming, sulphuric acid alkylation, thermocracking and visbreaking, coking and gas fractionation, solvent refining and dewaxing of oil distillates, tar deasphalting and bitumen production, gas desulphurization and sulphur production units as well as environmental facilities.