Paraffin wax precipitates readily from petroleum on chilling. Technical progress has served only to make the separations and filtration more efficient and economical. Purification methods consist of chemical treatment, decolorization by adsorbents, and fractionation of the separated waxes into grades by distillation, recrystallization, or both. Crude oils differ widely in wax content.
date_rangeDec 29' 2018 / India
date_rangeAug 08' 2018 / Iran
date_rangeAug 08' 2018 / Iran
date_rangeAug 07' 2018 / Iran