Abstract: The invention relates to a method for modifying cellulose ethers. The inventive method is characterised in that a cellulose ether having a humidity content of between 5 and 90% is intensively mixed with between 0.1 and 5 wt. %—in relation to the dry cellulose ether—of an additive or an additive mixture in the form of an aqueous or organic suspension or solution, at temperatures of between 20 and 100° C., and the mixture obtained is then dried.

Abstract: The invention relates to a method for the production of at least alkylated, non-ionic cellulose ethers, whereby at least 10% of all hydroxy groups contained therein are alkylated and which may flocculate in water, within a temperature range of 45 to 95° C. The invention is characterized in that at least one surfactant in solid, liquid, or solution form is added to the cellulose for production of the cellulose ether.

Abstract: The invention relates to a method for the production of cellulose ethers, whereby cellulose ethers having free hydroxyl groups are reacted with dicarboxylic and/or polycarboxylic acids and a nitrogen-containing compound. The process further comprises intensively mixing essentially dry, pulverulent cellulose ether with a mixture of organic bifunctional and/or polyfunctional acid and nitrogen-containing compound in a non-nucleophilic organic solvent prior to reacting the cellulose ether to provide the modified cellulose ether which can be stirred into water at a pH greater than or equal to 11 without agglutination.

Abstract: A method for the depolymerization of cellulose ethers by acid oxidative decomposition. Ground and dried cellulose ether is exposed to gaseous acid or is sprayed with an acid solution. It is brought into contact with an oxidizing agent or an oxidizing agent solution, and depolymerized at temperatures in the range from 50 to 120° C. over a period in the range from 0.01 to 10 hours. The acid is subsequently neutralized by adding a base. The water content of the reaction mixture does not exceed 10% by weight during depolymerization.

Abstract: The invention relates to a method for the production of at least alkylated, non-ionic cellulose ethers, whereby at least 10% of all hydroxy groups contained therein are alkylated and which may flocculate in water, within a temperature range of 45 to 95° C. The invention is characterised in that at least one surfactant in solid, liquid or solution form is added to the cellulose for production of the cellulose ether.

Abstract: The invention relates to a method for modifying cellulose ethers. The inventive method is characterised in that a cellulose ether having a humidity content of between 5 and 90 % is intensively mixed with between 0.1 and 5 wt. %—in relation to the dry cellulose ether—of an additive or an additive mixture in the form of an aqueous or organic suspension or solution, at temperatures of between 20 and 100 ° C. and the mixture obtained is then dried.

Abstract: In the process according to the invention, the cellulose ether to be depolymerized is depolymerized in the form of an acid slurry in an apparatus which consists of an acid-resistant material and is provided with an inlet and outlet, where the inlet and outlet are separated from one another by a filter element, at a temperature above the flocculation temperature of the depolymerized cellulose ether in the space between the inlet and the filter element, subsequently neutralized and then separated from the filtrate by releasing the filtrate, which, in contrast to the cellulose ether, is not retained by the filter element. If necessary, this can be followed by purification and drying of the cellulose ether.