Abstract
AbstractXanthation can be accomplished by slurrying the alkali cellulose in an organic liquid chosen to be miscible with carbon disulfide, immiscible with water, and a nonsolvent for sodium hydroxide, alkali cellulose, cellulose xanthate, and other components of viscose. Straight‐chain hydrocarbons, such as n‐hexane and n‐heptane, satisfy these requirements and function very well. A viscose preparation system using this method of xanthation would consist of a slurry step wherein the alkali cellulose and carbon disulfide are reacted in the selected organic liquid, a filtering step to remove the xanthate from the liquid, and a mixing operation to dissolve the xanthate in weak alkali to produce viscose. Because of the near‐perfect distribution of carbon disulfide throughout the reaction, this method of xanthation produces filterable viscoses a t very low degree of substitution. It is also possible to produce viscose of identical composition at widely different process conditions by various combinations of temperature, reaction time, and carbon disulfide concentration.
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