规整填料在加压精馏中的传质性能

高压精馏是现代过程工业中十分重要的分离过程 ,例如炼油工业中轻烃的分离 ,石油化工中乙烯、丙烯等低碳烃类的分离 ,都是经过高压精馏完成的 .高压精馏效率一般较在常压下有所降低 ,其中填料塔较板式塔下降更明显 ,故通常认为采用板式塔比较好 .但规整填料由于其大通量、低压降等优点 ,已经开始涉及高压领域 ,因此对规整填料在高压下的性能需进行测定和研究 .目前 ,对规整填料在高压下传质性能的研究 ,国外ＦＲＩ1] 近年已开始进行 ,但其实验数据较少 ,在国内目前还属空白 .本文在国家重点精馏分离实验室高压热模精馏实验塔上进行了一系列…

MASS TRANSFER CHARACTERISTICS IN HIGH PRESSURE DISTILLATION COLUMN PACKED WITH STRUCTURED PACKING

Experiments were conducted in the high pressure distillation column containing corrugated structured packing of Mellapak 250Y under operating pressure from 0.3 MPa to 2 MPa, using n -butane and n -pentane mixture as the separating material. The height equivalent to a theoretical plate (HETP) was evaluated from the measured n -butane liquid concentration profile along the packing. After carefully analyzed, the HETP may be reasonably divided into two parts. The first part is the ideal height of mass transfer unit, which is caused by the mass transfer resistance between vapor and liquid. Another part is the height of backmixing unit (HBU), which is caused by the backmixing of vapor and liquid. The parameters of HBU correlation were evaluated by the experimental data. The present HETP correlation was used to predict the experimental results in literature, and well agreement was found between them.