Optimization of Deacetylation Process for Regenerated Cellulose Hollow Fiber Membranes
Table 2
The OED results for deacetylation of CA hollow fibers.
Number
Status
Swelling time
Concentration
Solutions
Reaction time
Degree of cross-linking (%)
Acetyl content (%)
PVP content (%)
1
Design
No swelling
0.075 M
50% ethanol
4 h
16.81
14.42
18.83
2
Design
Swelling 24 h
0.075 M
50% ethanol
2 h
25.09
21.44
24.85
3
Design
Swelling 1 h
0.05 M
50% ethanol
2 h
17.62
15.89
21.59
4
Design
Swelling 24 h
0.05 M
96% ethanol
4 h
17.84
13.63
20.20
5
Design
No swelling
0.05 M
50% ethanol
0.5 h
13.25
34.98
17.43
6
Design
Swelling 1 h
0.075 M
96% ethanol
0.5 h
29.22
23.85
21.53
7
Design
Swelling 24 h
0.1 M
50% ethanol
0.5 h
15.89
20.42
21.04
8
Design
Swelling 1 h
0.1 M
50% ethanol
4 h
15.53
15.55
20.50
9
Design
No swelling
0.1 M
96% ethanol
2 h
21.67
19.47
24.08
10
Holdout
Swelling 24 h
0.075 M
96% ethanol
4 h
24.45
14.06
26.40
11
Holdout
Swelling 1 h
0.05 M
96% ethanol
4 h
17.37
12.00
20.30
12
Simulation
Swelling 1 h
0.075 M
50% ethanol
2 h
13
Simulation
Swelling 1 h
0.075 M
96% ethanol
2 h
Holdout; simulation; forms the hydrogen bond between CA and PVP; the value is calculated according to the ratio of absorption from IR spectra (2320 cm−1/1030 cm−1); 1740 cm −1/1030 cm−1; 1655 cm−1/1030 cm−1.
