FIELD: pulp and paper industry.
SUBSTANCE: cellulose masses, according to certain embodiments, contain fibers of cross-linked cellulose and have a high degree of white, chemical activity and intrinsic viscosity, and for this reason, they may be well suited for the use as precursors when producing low-colored cellulose derivatives having high viscosity. A method for producing cellulose mass includes forming cellulose mass from cellulose source materials; bleaching cellulose mass; cross-linking cellulose fibers in cellulose mass using poly-epoxide agent for cross-linking, while cellulose mass has consistency equal to or more than 12%; and drying cellulose mass after bleaching cellulose mass and after cross-linking cellulose fibers, while dried cellulose mass has viscosity of obtained carboxymethylcellulose equal to or more than 60 cP. Cross-linking cellulose fibers can include exposing fibers to the agent for cross-linking based on simple glycidyl ether containing two or more glycidyl groups and having molecular weight per one epoxide in the range from 140 to 175. Another method for producing cellulose mass includes obtaining an aqueous suspension of cellulose mass, where cellulose mass contains fibers of chemically obtained wood cellulose mass, which are preliminarily bleached and dried; cross-linking fibers of chemically obtained wood cellulose mass using the agent for cross-linking based on simple glycidyl ether having two or more glycidyl groups, where during cross-linking the aqueous suspension of cellulose mass has consistency equal to or more than 12%; and drying cellulose mass after cross-linking fibers of chemically obtained wood cellulose mass.
EFFECT: producing cross-linked kraft cellulose.
28 cl, 2 dwg, 12 tbl
