In
Textile Processing the following materials are considered to be basic
chemicals or bulk chemicals used in processing. The quality of each product
whether basic or auxiliary chemical would certainly affect the final
quality of textile processing. So a good dye-house should have a continuous
quality monitoring procedure like one shown below. As and when a new
product or chemical enters your dye-house, its quality should be compared with
the previous supply without fail.
Caustic Soda lye:
Take approximately 25 grams of caustic diluted
to 500 ml. From this take 20ml and titrate with 1 N, H2SO4
using phenolphthalein as indicator.
Percentage Strength = V x 40 x 100/ 20 x 2 x wt where V is the volume of H2SO4
consumed and wt = 25/500 x 20 grams.
Conversion of Caustic soda concentrations:
To convert a weight of a caustic soda solution
to a weight of solid caustic soda, multiply by the %w/w content and divide by
100.
Example: How much sold caustic soda should be
used in place of 12 kg of 100TW caustic soda (% w/w = 47.33)?
Calculation: 12 x 47.33/100 = 5.7 kg
NaOH solid.
To convert a volume of caustic soda solution in
to weight of solid caustic soda, multiply the volume, in liters, by the g/l
content of the solution.
Example: How much solid caustic soda should be
used in place of 12 liters of 48.1°Be (-710g/l NaOH) caustic solution?
Calculation: 12 x 710 = 8520g = 8.5kg of
NaOH solid.
Specific Gravity and concentration of
Caustic Soda solutions at 20C
| SG |
Be |
TW |
%W/W |
G/L |
| 1.000 |
0 |
0 |
1.05 |
10.6 |
| 1.050 |
6.7 |
10 |
4.68 |
48.9 |
| 1.100 |
13.0 |
20 |
9.19 |
101.1 |
| 1.150 |
18.8 |
30 |
13.73 |
157.9 |
| 1.160 |
19.8 |
32 |
14.64 |
169.8 |
| 1.170 |
20.9 |
34 |
15.54 |
181.8 |
| 1.180 |
22.0 |
36 |
16.44 |
194.0 |
| 1.190 |
23.0 |
38 |
17.35 |
206.4 |
| 1.200 |
24.0 |
40 |
18.26 |
219.0 |
| 1.210 |
25.0 |
42 |
19.61 |
231.8 |
| 1.220 |
26.0 |
44 |
20.07 |
244.9 |
| 1.230 |
26.9 |
46 |
20.98 |
258.0 |
| 1.240 |
27.9 |
48 |
21.90 |
271.5 |
| 1.250 |
28.8 |
50 |
22.62 |
285.2 |
| 1.260 |
29.7 |
52 |
23.28 |
299.0 |
| 1.270 |
30.6 |
54 |
24.65 |
312.9 |
| 1.280 |
31.5 |
56 |
25.56 |
327.1 |
| 1.290 |
32.4 |
58 |
26.48 |
341.6 |
| 1.300 |
33.3 |
60 |
27.41 |
256.2 |
| 1.310 |
34.2 |
62 |
28.33 |
371.1 |
| 1.320 |
35.0 |
64 |
29.26 |
386.2 |
| 1.330 |
35.8 |
66 |
30.20 |
401.6 |
| 1.340 |
36.6 |
68 |
31.14 |
417.2 |
| 1.360 |
38.2 |
72 |
33.06 |
449.6 |
| 1.370 |
39.0 |
74 |
34.03 |
456.0 |
| 1.380 |
39.8 |
76 |
35.01 |
483.2 |
| 1.390 |
40.5 |
78 |
36.00 |
500.4 |
| 1.400 |
41.2 |
80 |
36.99 |
518.0 |
| 1.410 |
42.0 |
82 |
37.99 |
535.6 |
| 1.420 |
42.7 |
84 |
38.99 |
553.6 |
| 1.430 |
43.4 |
86 |
40.00 |
572.0 |
| 1.440 |
44.1 |
88 |
41.03 |
590.8 |
| 1.450 |
44.8 |
90 |
42.07 |
610.0 |
| 1.460 |
45.4 |
92 |
43.12 |
629.6 |
| 1.470 |
46.1 |
94 |
44.17 |
646.2 |
| 1.480 |
46.8 |
96 |
45.22 |
669.2 |
| 1.490 |
47.4 |
98 |
46.27 |
698.2 |
| 1.500 |
48.1 |
100 |
47.33 |
710.0 |
| 1.510 |
48.7 |
102 |
48.30 |
730.4 |
| 1.520 |
49.4 |
104 |
49.44 |
751.2 |
| 1.530 |
50.0 |
106 |
50.50 |
772.4 |
|
