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The author and team members used kraft pulp masson pine lignin as raw materials to prepare spherical lignin adsorbents using inverse suspension technology, and used it as a skeleton to graft copolymerize it with acrylonitrile .
① Preparation of spherical lignin beads After adding a certain proportion of dispersed phase transformer oil and chlorobenzene in a 500mL three-necked flask, adding 40.
②The graft copolymerization of lignin beads and acrylonitrile
a.
b.
③ Preparation of chelating spherical lignin adsorbent Weigh a certain amount of SLAN, put it into a three-necked flask containing a certain volume of hydroxylamine hydrochloride methanol solution (V water : V methanol = 1:1), and use a small amount of anhydrous carbonic acid Adjust the pH value of the solution with sodium , place it in a constant temperature water bath, stir for 60 minutes at 80°C, and then stand still at the same temperature for 60 minutes, take it out, wash, dry, and weigh to obtain a spherical wood containing amidoxime groups.
The main influencing factor in the amidoximation experiment is the concentration of hydroxylamine hydrochloride
Figure 4-29 The effect of the concentration of hydroxylamine hydrochloride on the amidoximation reaction
It can be seen from Figure 4-29 that when the concentration of hydroxylamine hydrochloride is 0.
