Cellulose and cellulose derivatives / Part III / ed. by Emil by Emil Ott; Harold M Spurlin; Mildred W Grafflin; et al

By Emil Ott; Harold M Spurlin; Mildred W Grafflin; et al

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If the first groups are blocked by sulfite before the phenols have the opportunity of reaction, the process proceeds normally. Douglas fir (Pseudotsuga taxifolia) also has a compound in its heartwood which inhibits the sulfite cook. Pew 46 has isolated the compound and identified it: OH O Taxifolin This flavanone has been given the name taxifolin. According to chemical Its behavior is apparently the same as structure it is dihydroquercetin. pinosylvin in pines. (g) ACID-SUSCEPTIBLE WOOD In a study of some unexpected variations of pulp strength found in wood samples, Green and Yorston 47 found that certain areas in different wood became brittle on treatment with SC>2 or other dilute acids, while the wood retained its soft fibrous character.

1. Types of Cottonseed Fibers on types of hair, lint fibers (or staple cotton) and linters, are found from are removed fibers These the usual varieties of cotton seed (Fig. 9). Two (A) seed with all fibers (lint and linters); Fig, 9. Cotton seeds with fibers: (B) seed with linters after removal of lint; (C) seed with hull fiber after removal of linters. Courtesy of Hercules Powder Company. 1 J. H. Kettering and C. M. Conrad, hid. Ent>. , Anal. , 14, 432 (1942). VI. PREPARATION FROM NATURAL SOURCES 551 the seed in two separate operations.

The color was light yellow due to extraction of water solubles and to small amounts of lignosulfonic acid. About the third hour it changed gradually to a reddish brown with appearance of This color deepened and during the larger quantities of lignosulfonic acid. last 2 hrs. turned to a coffee brown due to decomposition of carbohydrates. These changes can be traced in the curves. Starting with the third hour the methoxyl content, an indication of the lignin present in the liquor, and the total solids increased in parallel fashion.

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