|
| Table 2. Central composite design for the diluted acid pretreatment expressed in coded values. |
Experiment |
Time of exposure |
Acid concentration |
Solid:liquid ratio |
1 |
-1 |
-1 |
+1 |
2 |
+1 |
-1 |
+1 |
3 |
-1 |
-1 |
-1 |
4 |
+1 |
-1 |
-1 |
5 |
-1 |
+1 |
+1 |
6 |
+1 |
+1 |
+1 |
7 |
-1 |
+1 |
-1 |
8 |
+1 |
+1 |
-1 |
9 |
0 |
-α |
0 |
10 |
0 |
+α |
0 |
11 |
0 |
0 |
+α |
12 |
0 |
0 |
-α |
13 |
-α |
0 |
0 |
14 |
+α |
0 |
0 |
15 |
0 |
0 |
0 |
16 |
0 |
0 |
0 |
17 |
0 |
0 |
0 |
|
|
|