板段结构参数对脉冲柱传质的影响

THE EFFECT OF CARTRIDGE STRUCTURE PARAMETERS ON THE MASS TRANSFER OF THE PULSED SIEVE-PLATE EXTRACTION COLUMN

本文研究了在30％TBP(OK)～HNO_3,30％TBP(OK)～UO_2(NO_3)_2～HNO_3体系中,筛板孔径(2～8mm)、自由截面(10～32％)、板间距(2.5～10cm)、开孔形状(平板和喷咀板)、表面浸润性、脉冲强度等对传质的影响。在Ⅰ型柱中,当操作流量相同时,最小的HETS几乎和板结构无关;在Ⅱ型柱中,合适、的板结构(K=2～3)和脉冲强度下,传质效率和Ⅰ型柱相当且有小得多的级停留时间,但K较大时传质效果较差。在较大直径的脉冲柱中,选用大于3mm孔径的板结构是合适的。

In this paper, the effects of sieve-plate hole diameter (2～8mm), free area(10～32%), plate spacing(2.5～10mm), hole shape(flat plate and nozzle plate), plate wettability and pulse intensity on the mass transfer of the pulsed sieve-plate extraction column are studied in the systems of 30%TBP/ OK-HNO_3 and 30%TBP/OK-UO_2(NO_3)_2-HNO_3 respectively·When the operation throughputs are same in the I type column,minimum HETS is nearly independent of cartridge structure. In suitable cartridge geometry (K= 2～3) and pulse intensity, mass transfer efficiency of the Ⅱ type column is near to that of the Ⅰ type column, and resident time ot the Ⅱ type column is shorter, but mass transfer of the column is poorer in the Ⅱ type column when K value is larger. In the pulsed sieve-plate column of larger diameter, sieveplate with hole diameter above 3mm is better choice.