| 摘要 |
<p>303,482. Winternitz, R. Jan. 4, 1928, [Convention date]. Cellulose xanthates; preparatory treatment of cellulose.-Alkali lyes which contain organic impurities such as those obtained in the cellulose and viscose industries are purified by precipitating the impurities, for example, hydrocellulose, by addition of am alcohol such as methyl or ethyl alcohol. A small amount of a lead salt such as lead acetate may be added to remove the colour. The filtered lve is distilled to separate the alcohol and treated with quicklime to regenerate caustic soda. The lye may be used again or evaporated to dryness.</p> |
