Читать книгу A Text-book of Paper-making - C. F. Cross - Страница 16

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—Cellulose itself is only slightly affected by exposure to a temperature of 200° C. (392° F.) but in contact with water at this temperature, in sealed glass4 most part into dark brown insoluble products, a portion, however, passing into solution in the water, imparting to it a deep yellow colour. A large quantity of carbonic acid is {15} formed, and the solution contains in addition to formic acid an appreciable quantity of pyrocatechol. The formation of this aromatic substance from cellulose is, perhaps, the most noticeable feature of the decomposition.

4 The action of alkaline substances dissolved from the glass must be taken into account in this decomposition.