| Centrifugal extraction is an important unit operation in chemical processes and has many applications in the process industry.The geometrical parameters of the extractor have an important influence on the extraction efficiency.However,presently research on extraction efficiency is scarce.In this paper,the variation of extraction efficiency with different geometrical parameters was investigated experimentally using an annular centrifugal contactor(ACC)home-made by 3D Printing with cyclohexane-isopropanolwater as the experimental material system.The result showed that extraction efficiency was 94.5%,89.6%,85.5% when the annular width of ACC was 3.0 mm,4.0 mm,5.0 mm separately,and increased from92.1% to 94.5% when the clearance height increased from 3.0 mm to 5.0 mm.The study found that the extraction efficiency increased by 2.3% and 5.2% when four straight vanes instead of six and eight,respectively.When the bending direction of the vane was the same as the liquid flow in the annulus,the extraction efficiency was enhanced by 2.2% compared with straight vane;if the direction was opposite,extraction efficiency decreased by 3.0%.For the first time,the response surface regression model and partial least squares regression model were applied to fit and analyze the experimental data,respectively.It was found that the influence of various parameters on extraction efficiency was not independent,and there were interactions between these parameters.There was a strong interaction between the rotor inlet diameter and annular width because the quadratic term coefficient in the response surface regression model was-1.46,and the partial derivative in the partial least squares model was-8.17.This study enriches the existing studies of ACCs by providing data on the effects of multiple geometrical parameters on the extraction efficiency and the interaction data between these parameters.These results could serve as references for the design of ACC and the optimization of the extraction process. |
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