The present technology is directed to fluff pulps with improved odor control as well as methods of making such fluff pulps. A fluff pulp is provided that includes a bleached kraft fiber and a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. The bleached kraft fiber includes a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of more than about 3.5 meq/100 grams; an ISO brightness of at least 80; and a viscosity from about 2 cps to about 9 cps.

The present technology is directed to fluff pulps with improved odor control as well as methods of making such fluff pulps. A fluff pulp is provided that includes a bleached kraft fiber and a copper ion content from about 0.2 ppm to about 50 ppm by weight of the bleached kraft fiber. The bleached kraft fiber includes a length-weighted average fiber length of at least about 2 mm, a copper number of less than about 7, a carboxyl content of more than about 3.5 meq/100 grams; an ISO brightness of at least 80; and a viscosity from about 2 cps to about 9 cps.

The present disclosure belongs to the technical field of papermaking, and specifically relates to a short-sequence ECF bleaching process X/Z/D-E.sub.OP-D or X/D/Z-E.sub.OP-D for kraft wood pulp, comprising the following steps: (1) sequential bleaching (X/Z/D or X/D/Z): subjecting an oxygen delignified wood pulp to X/Z/D.sub.1 or X/D.sub.1/Z sequential bleaching to prepare a semi-bleached pulp; (2) reinforced alkaline extraction treatment (E.sub.OP): performing hydrogen peroxide and oxygen enhanced alkaline extraction treatment on the pulp after sequential bleaching to further dissolve the residual lignin in the pulp; (3) supplemental bleaching (D): performing a chlorine dioxide supplemental bleaching on the pulp after the enhanced alkaline extraction treatment to obtain a fully bleached pulp (88% ISO).

The present disclosure belongs to the technical field of papermaking, and specifically relates to a short-sequence ECF bleaching process X/Z/D-E.sub.OP-D or X/D/Z-E.sub.OP-D for kraft wood pulp, comprising the following steps: (1) sequential bleaching (X/Z/D or X/D/Z): subjecting an oxygen delignified wood pulp to X/Z/D.sub.1 or X/D.sub.1/Z sequential bleaching to prepare a semi-bleached pulp; (2) reinforced alkaline extraction treatment (E.sub.OP): performing hydrogen peroxide and oxygen enhanced alkaline extraction treatment on the pulp after sequential bleaching to further dissolve the residual lignin in the pulp; (3) supplemental bleaching (D): performing a chlorine dioxide supplemental bleaching on the pulp after the enhanced alkaline extraction treatment to obtain a fully bleached pulp (88% ISO).

The present invention relates to a method for bleaching an unbleached or pre-bleached paper pulp comprising at least the following consecutive steps: a) preparing an unbleached or pre-bleached paper pulp having a pH of at least 8, b) bringing the paper pulp obtained at the end of step a) into contact with chlorine dioxide, c) when the pH of the paper pulp obtained from step b) is lower than 10, adding at least one Brønsted base to the paper pulp, d) adding hydrogen peroxide to the paper pulp obtained at the end of step c), e) maintaining the paper pulp obtained at the end of step d) in a first bleaching tower, f) optionally, adding sulphuric acid to the paper pulp obtained at the end of step e) and maintaining the obtained paper pulp in a second bleaching tower, the method dispensing with the need for a step of washing the paper pulp before the end of step e), and, if applicable, before the end of step f).

The present invention relates to a method for bleaching an unbleached or pre-bleached paper pulp comprising at least the following consecutive steps: a) preparing an unbleached or pre-bleached paper pulp having a pH of at least 8, b) bringing the paper pulp obtained at the end of step a) into contact with chlorine dioxide, c) when the pH of the paper pulp obtained from step b) is lower than 10, adding at least one Brønsted base to the paper pulp, d) adding hydrogen peroxide to the paper pulp obtained at the end of step c), e) maintaining the paper pulp obtained at the end of step d) in a first bleaching tower, f) optionally, adding sulphuric acid to the paper pulp obtained at the end of step e) and maintaining the obtained paper pulp in a second bleaching tower, the method dispensing with the need for a step of washing the paper pulp before the end of step e), and, if applicable, before the end of step f).

According to an example aspect of the present invention, there is provided a method of treating, such as hydrolysing, a cellulosic material, comprising: preparing a mixture comprising or consisting of a cellulosic material and a chlorite containing water solution, such as a chlorite salt containing water solution; acidifying said mixture.

According to an example aspect of the present invention, there is provided a method of treating, such as hydrolysing, a cellulosic material, comprising: preparing a mixture comprising or consisting of a cellulosic material and a chlorite containing water solution, such as a chlorite salt containing water solution; acidifying said mixture.

Methods, kits, cartridges, and compounds related to generating chlorine dioxide by exposing ClO.sub.2.sup.− to at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst are described.

Methods, kits, cartridges, and compounds related to generating chlorine dioxide by exposing ClO.sub.2.sup.− to at least one of an iron porphyrin catalyst or an iron porphyrazine catalyst are described.