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Modified lignin adsorbent
[Structural formula] Lignin is an amorphous organic polymer with a huge networked spatial structure.
Currently, there is no unified structure and definition for lignin.
Research so far shows that it is basically composed of the following three types Phenylpropane monomer structure is a kind of high polymer produced by various coupling methods and random coupling
.
[Physical and chemical properties] Originally, lignin is a white or nearly colorless substance.
The commonly seen lignin is caused during the separation and preparation process.
[Preparation method] There are active groups such as aromatic groups, phenolic hydroxyl groups, alcoholic hydroxyl groups, carbonyl groups, methoxy groups, carboxyl groups, and conjugated double bonds in the molecular structure of lignin, which can be subjected to various types of chemical modification
.
Among them, the phenolic hydroxyl group and alcoholic hydroxyl group are the most important.
The chemical modification of lignin can be roughly divided into two categories: aromatic nucleus selective modification and side chain modification
.
Halogenation and nitration reactions occur preferentially on the aromatic nucleus, in addition to carboxymethylation, phenolization, and graft copolymerization
Related Links: Application of Modified Cellulose Adsorbent (2)
