Table 4
Influence of addition amount of sodium hydroxide
| No. | Theoretical value of  /g | Ratio of actual value to theoretical value of  | Content of nitrogen after reaction/% | Quality of remaining liquid after reaction/g | Removal rate of nitrogen/% |
|---|---|---|---|---|---|
| 1 | – | – | 2.49 | 300.00 | – |
| 2 | 21.36 | 0.60 | 2.07 | 317.60 | 11.99 |
| 3 | 21.36 | 0.70 | 1.97 | 315.80 | 16.72 |
| 4 | 21.36 | 0.80 | 1.90 | 312.50 | 20.52 |
| 5 | 21.36 | 0.90 | 1.82 | 313.00 | 23.74 |
| 6 | 21.36 | 1.00 | 0.986 | 339.40 | 55.20 |
| 7 | 21.36 | 1.10 | 0.993 | 319.20 | 57.57 |
| 8 | 21.36 | 1.20 | 0.991 | 323.00 | 57.15 |
| No. | Theoretical value of /g | Ratio of actual value to theoretical value of | Content of nitrogen after reaction/% | Quality of remaining liquid after reaction/g | Removal rate of nitrogen/% |
|---|---|---|---|---|---|
| 1 | – | – | 2.49 | 300.00 | – |
| 2 | 21.36 | 0.60 | 2.07 | 317.60 | 11.99 |
| 3 | 21.36 | 0.70 | 1.97 | 315.80 | 16.72 |
| 4 | 21.36 | 0.80 | 1.90 | 312.50 | 20.52 |
| 5 | 21.36 | 0.90 | 1.82 | 313.00 | 23.74 |
| 6 | 21.36 | 1.00 | 0.986 | 339.40 | 55.20 |
| 7 | 21.36 | 1.10 | 0.993 | 319.20 | 57.57 |
| 8 | 21.36 | 1.20 | 0.991 | 323.00 | 57.15 |