Читать книгу A Text-book of Paper-making - C. F. Cross - Страница 22

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—Jute, exposed to the action of bromine water in the cold, combines with the halogen, being oxidised at the same time, and the products may be dissolved by boiling the modified fibre in weak alkaline solutions. On repeating this treatment four or five times, a residue of cellulose is ultimately obtained, amounting to 72 or 73 per cent. of the original fibre: the cellulose is obtained in the form of the disintegrated fibre elements. On allowing the halogen to act in presence of an alkali, i.e., as hypobromite, not only is its action intensified and accelerated, but its modus operandi more clearly revealed. The chief products are in this case, carbonic acid, bromoform CHBr3 (which may be isolated by distillation), and cellulose. At the same time the yield of cellulose is considerably less than by the former method, the cellulose itself being attacked by the hypobromite.