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AssigneeDow Global Technologies LLC
InventorsMatthias Sprehe, Bettina Hoelzer
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The present invention relates to a process for the production of alkali cellulose for the production of alkali cellulose and, optionally, cellulose ethers from cellulose in the presence of alkali and, if applicable, with alkylating and/or hydroxyalkylating agent(s) comprising the reaction of a cellulose with an alkali metal hydroxide, wherein the alkali metal hydroxide is mixed with cellulose in a mixing apparatus, the mixing apparatus (1) having an upper region (20, 102a, 202a) with a first cross-section and a lower region (21, 102b, 202b) with a second cross-section, the second cross-section being the same as or smaller than the first cross-section and comprising at least one non-horizontally oriented mixing device (23, 27, 121, 221, 224).
A process for the production of alkali cellulose comprising the reaction of a cellulose with an alkali metal hydroxide, characterized in that the alkali metal hydroxide is mixed with a batch of ground cellulose in a mixing apparatus, the mixing apparatus having an upper region with a first cross-section and a lower region with a second cross-section, the second cross-section being smaller than the first cross-section and comprising at least one non-horizontally oriented continuous or divided single-shaft mixing device in the form of a screw or single or double helix.
Dependencies are inferred from the claim text.