Graft copolymerization of lignin and acrylonitrile

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.