Wood products treated spruce

Extractive-free wood flour of Acer saccharum Marsh, (sugar maple), a-cellulose, birch acetyl-4-O-methylglucuronoxylan, and spruce-milled wood lignin were treated with 40% HNO3 and the resulting products were investigated by IR and UV spectroscopy in... 

The most important application of cellulosic materials is the production of paper. Thus wood is transformed first into pulp by mechanical or chemical modification. Hardwood trees such as eucalyptus, birch, and softwood trees like pinus and spruce are used. In the Kraft process woodchips are treated with sodium hydroxide and sodium sulfide to promote the breakdown of the linkage between lignin, some hemicelluloses, and cellulose. This produces cellulose containing residual lignin. The latter is removed by a bleaching process that can apply several oxidizing agents. White pulp is pure cellulose that is used to produce paper. 

---