| 1 | The operation practice proves that the DDS desulfurizer is clearly better than the tannin extract. | |
| 2 | Meanwhile, the modification approaches of vegetable tannin extracts for the purpose of combination tanning are described. | |
| 3 | It shows that the solution viscosity drops and the relative molecular mass reduces with narrow distribution. | |
| 4 | Recent advances of vegetable tannin chemistry and technique of tannin extract production in China and foreign countries are briefly discussed and reviewed. | |
| 5 | Influencing factor was discussed for tannin extract solution absorb and regenerate by tannin extract method in production. |
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