(3) To (2) Above Into A Powder After Drying In The Reaction Vessel, Then Placed In 20: 1 Ratio Of Solid Sodium Hydroxide, Mixing, Temperature Was Raised To 40 Degrees, Then Water Was Added, The Proportion Of Water And Powder 2: 1; Continues To Heat Up To 100 - 110 ° C, The Reaction For 6-8 Hours;
(4) To (3) Above Was Cooled Separation, A Cooling Temperature Of 20- 30 ° C, The Water-Insoluble Portion Between 30- 40 ° C And Dried To Obtain Lignin.
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