提出了一种基于塔总组合曲线(column grand composite curve,CGCC)确定分馏塔合理进料位置的方法——将分馏塔分别视为精馏塔与提馏塔进行物料与能量衡算,构造出与CGCC部分重合的两条相交的全塔精馏线和全塔提馏线,通过分析CGCC进料点...提出了一种基于塔总组合曲线(column grand composite curve,CGCC)确定分馏塔合理进料位置的方法——将分馏塔分别视为精馏塔与提馏塔进行物料与能量衡算,构造出与CGCC部分重合的两条相交的全塔精馏线和全塔提馏线,通过分析CGCC进料点与两曲线交点的位置关系,或定量比较两曲线上各塔板焓差大小,可以判断进料位置的合理性。研究发现,与非进料塔板相比,若CGCC进料点最靠近两曲线交点以及两曲线上进料塔板焓差取得最小值,则该进料位置最佳。两个二组分塔和一个多组分塔的应用实例表明,本文给出方法确定的分馏塔合理进料位置,与其它基于节能考虑确定分馏塔合理进料位置的方法和技术得到的计算结果基本相同。展开更多
True Boiling Point （TBP） distillation is one of the most common experimental techniques for determination of petroleum properties. The methods for performing TBP distillation experiments are described by ASTM D2892 ...True Boiling Point （TBP） distillation is one of the most common experimental techniques for determination of petroleum properties. The methods for performing TBP distillation experiments are described by ASTM D2892 and by ASTM D5236. However, these methods are established for petroleum fractions that reach temperatures up to 565 ~C. In this work, two petroleum residues were distilled in a falling film molecular distillation prototype and the data were used to obtain the extension of the TBP curve above a temperature of 565 ~C. It was possible to extend the TBP curve of both petroleum up to temperatures close to 700 ~C with consistency and continuity in comparison to the standard curve. In addition, an amount of raw material that was been treated as residue could be reused.展开更多
The separation of ternary mixture of butanol, butyl acetate, and methyl isobutyl ketone(MIBK) was initially analyzed by the residual curve. In this process, MIBK was chosen as the azeotropic agent during the first ste...The separation of ternary mixture of butanol, butyl acetate, and methyl isobutyl ketone(MIBK) was initially analyzed by the residual curve. In this process, MIBK was chosen as the azeotropic agent during the first step of separation. The optimum mass ratio of extra MIBK was 1.6 in the modified feed stream according to the residual curve. Thus on this condition the top product was butanol-MIBK azeotrope while the bottom product was butyl acetate in the preliminary separation of the mixture. Then the butanol and MIBK azeotrope was separated by the double effect pressureswing distillation with the low pressure column performing at 30 kPa and the atmospheric pressure column at 101 kPa. The optimal operating conditions were then obtained by using Aspen Plus to simulate and optimize the process. The results showed that the mass purities of butanol, butyl acetate, and MIBK were all more than 99% and reached the design requirements. Additionally, compared with the traditional distillation with outside heating, the double effect pressure swing distillation saved the reboiler duty by 48.6% and the condenser duty by 44.6%.展开更多
文摘提出了一种基于塔总组合曲线(column grand composite curve,CGCC)确定分馏塔合理进料位置的方法——将分馏塔分别视为精馏塔与提馏塔进行物料与能量衡算,构造出与CGCC部分重合的两条相交的全塔精馏线和全塔提馏线,通过分析CGCC进料点与两曲线交点的位置关系,或定量比较两曲线上各塔板焓差大小,可以判断进料位置的合理性。研究发现,与非进料塔板相比,若CGCC进料点最靠近两曲线交点以及两曲线上进料塔板焓差取得最小值,则该进料位置最佳。两个二组分塔和一个多组分塔的应用实例表明,本文给出方法确定的分馏塔合理进料位置,与其它基于节能考虑确定分馏塔合理进料位置的方法和技术得到的计算结果基本相同。
文摘True Boiling Point （TBP） distillation is one of the most common experimental techniques for determination of petroleum properties. The methods for performing TBP distillation experiments are described by ASTM D2892 and by ASTM D5236. However, these methods are established for petroleum fractions that reach temperatures up to 565 ~C. In this work, two petroleum residues were distilled in a falling film molecular distillation prototype and the data were used to obtain the extension of the TBP curve above a temperature of 565 ~C. It was possible to extend the TBP curve of both petroleum up to temperatures close to 700 ~C with consistency and continuity in comparison to the standard curve. In addition, an amount of raw material that was been treated as residue could be reused.
基金Supported by the National Natural Science Foundation of China(21306036)the Basic Research Program of Hebei Province(16964502D)
文摘The separation of ternary mixture of butanol, butyl acetate, and methyl isobutyl ketone(MIBK) was initially analyzed by the residual curve. In this process, MIBK was chosen as the azeotropic agent during the first step of separation. The optimum mass ratio of extra MIBK was 1.6 in the modified feed stream according to the residual curve. Thus on this condition the top product was butanol-MIBK azeotrope while the bottom product was butyl acetate in the preliminary separation of the mixture. Then the butanol and MIBK azeotrope was separated by the double effect pressureswing distillation with the low pressure column performing at 30 kPa and the atmospheric pressure column at 101 kPa. The optimal operating conditions were then obtained by using Aspen Plus to simulate and optimize the process. The results showed that the mass purities of butanol, butyl acetate, and MIBK were all more than 99% and reached the design requirements. Additionally, compared with the traditional distillation with outside heating, the double effect pressure swing distillation saved the reboiler duty by 48.6% and the condenser duty by 44.6%.
