石蜡基减压渣油（减渣）具有氢及饱和烃含量较高和硫、重金属及沥青质含量较低的特点。其直接催化裂化产品分布理想，工业试验表明汽油产率可达50％，无特殊环保问题。技术经济分析表明，当生产轻质燃料时，石蜡基减渣直接催化裂化工艺优于延迟焦化-催化裂化和溶剂脱沥青-催化裂化等传统的减渣加工组合工艺。 Paraffin-based vacuum residue (slag) with hydrogen and saturated hydrocarbon content and sulfur, heavy metals and asphaltene content is low. Its direct catalytic cracking product distribution ideal industrial test shows that the yield of gasoline up to 50%, no special environmental issues. The technical and economic analysis shows that the paraffin-based slag direct catalytic cracking process is superior to the traditional combination process of delayed coker-catalytic cracking and solvent deasphalting-catalytic cracking when producing light fuels.