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Wood is a source of a wide variety of chemical products. In theory, at least, the number and kind of possible chemical products are equal to those of the products made from petroleum. In practice, however, the chemical products of wood fall into two general groups: products of the chemical processing of wood or its components and wood extractives and their derivatives. Products of chemical processing, made by chemical modification of wood and wood components, include pulp and paper (if pulp is produced by chemical or semichemical methods; see the section Pulp and paper), products of cellulose and other molecular ...(100 of 12879 words)