Experimental Design and Optimization of Decolourization of Reactive Black-5 Dye Using Cloud Point Extraction

Table 2

Experimental results for optimization of RB-5 dye (25 ppm, 50 ppm, and 75 ppm) with TX-114 at various operating temperatures (40°C, 50°C, and 60°C).

				Experimental results				Calculated results
Test	X1	X2	X3	E (%)	Rv	Xs,d (ppm)	Xs,r (ppm)	E (%)	Rv	Xs,d (ppm)	Xs,r (ppm)
1	−1	1	−1	23.923	2.881	0.031	0.455	23.120	2.674	0.042	0.388
2	−1	1	1	34.577	3.734	0.238	0.796	34.910	3.664	0.065	0.739
3	−1	−1	−1	36.389	3.734	0.263	0.897	35.369	4.166	0.301	0.918
4	−1	0	0	36.441	4.384	0.359	0.911	39.632	4.105	0.453	0.967
5	−1	−1	1	63.657	6.383	0.454	0.987	61.955	6.221	0.511	0.949
6	0	0	−1	64.131	12.108	0.480	1.012	64.003	12.253	0.536	1.185
7	0	1	0	67.404	13.636	0.681	1.219	64.568	13.854	0.668	1.208
8	1	1	−1	67.782	15.741	0.795	1.297	69.776	15.745	0.862	1.344
9	0	0	0	72.755	17.924	0.886	1.603	73.144	17.636	0.809	1.621
10	1	1	1	73.381	19.048	0.897	1.819	74.692	18.614	0.879	1.832
11	1	−1	−1	78.961	18.765	1.208	2.020	78.919	19.237	1.142	1.964
12	0	0	1	80.792	24.378	1.222	2.141	79.754	24.061	1.433	2.047
13	0	−1	0	80.992	25.945	1.589	2.528	82.662	27.324	1.533	2.317
14	1	0	0	85.655	30.548	2.453	2.542	81.298	30.023	2.406	2.608
15	1	−1	1	97.536	36.986	2.853	2.864	98.631	36.597	2.832	2.941