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. 2021 Aug 25;6(35):22603–22615. doi: 10.1021/acsomega.1c02570

Table 2. Effect of the Process Conditions on the Sulfur Content in the DEAE-Cellulose Sulfate during Sulfation with Sulfamic Acid in the Presence of Urea at 90 °C.

  sulfur content (wt %)
time (h) 1,4-dioxane deep eutectic solvent (SAA/U)
0.5 2.3 2.0
1 3.8 3.1
1.5 6.9 4.9
2 8.5 6.4
3 10.1 8.9
4 10.2 9.2