蒸馏装置减压深拔实验研究及工业应用

Experimental research and industrial application of deep vacuum distillation for distillation unit

采用短程分子蒸馏技术,对独山子石化公司蒸馏装置减压渣油进行了深拔分离,考察了不同拔出深度窄馏分的性质,并对按比例调和的宽馏分减压深拔重蜡油作为催化裂化装置原料的性质进行了分析评价,结果表明,蜡油Ⅱ终馏点达到600.80℃时,蜡油Ⅱ收率提高2.32%,残炭值达1.38%,已不能满足催化原料残炭值控制要求。拔出终馏点大于600℃后,残炭、金属含量等指标迅速上升,重蜡油已不能满足催化原料控制指标。在工业应用中,建议通过优化和调整蒸馏装置的操作,控制拔出深度和重蜡油残炭,达到增加催化裂化原料来源、改善全厂蜡油平衡的目的。

The short-range molecular distillation technology is used to carry out deep vacuum distillation on vacuum residue oil from the distillation unit of Dushanzi Petrochemical Company. The properties of the narrow fractions under different distillation depth are analyzed and studied.The properties of heavy wax wide cuts from deep vacuum distillation,which is reconcile in proportion as FCC feedstock,are analyzed and evaluated.The results show that if the final boiling point of wax II reaches 600.80℃,the yield of wax II will increase 2. 32% and carbon residue value will reach 1. 38%,which has been unable to fit the control requirements of carbon residue value for FCC feedstock. When the final boiling point of distillation exceeds 600℃,the indexes of carbon residue and metal content rise rapidly,heavy wax oil has been unable to fit the control requirements for FCC feedstock.In industrial applications,it is proposed to control the depth of distillation and carbon residue of heavy wax oil through optimization and adjustment of operations of the distillation unit,finally to achieve the target of increasing the raw material source for FCC and improving the balance of wax oil in the whole plant.