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_rangeJul 06' 2018 / China
date_rangeJun 02' 2018 / Russia
date_rangeMay 28' 2018 / Russia
date_rangeMay 23' 2018 / Russia