TH18744A - Pulp production - Google Patents

Abstract

The method for producing chemical pulp from cellulose fibers consists of digestion of the fibrous material with a digestion liquid without a previous peroxide step according to fabrication.The fibrous residue is treated in at least one step prior to such digestion by: A liquid containing at least one compound can form a complex with a metal containing In nature in fibrous materials

Claims (3)

1.Methods for producing chemical membranes From cellulose fiber scraps Combine by doing Digesting fibrous materials with liquid digestion The method does not contain any peroxide step prior to such digestion, characterized by the fact that the fibrous material is minimally treated one step prior to the digestion step by means of a liquid with a helper. At least one separation can form metal complexes. In nature, in fiber materials are included. Which separate assistants were selected from a group consisting of Nitrogenous acid Polycarboxylic, Non-Nitrogenous Acid Polycarboxylic And phosphonic acid At least part of the said liquid is present during the treatment of the fibrous material and has a separator. Contains spent solvents, fresh digestion fluids, bleaching fluids, condensers, tap water or lake water. Or a mixture of that substance The aforementioned used solution has The low metal content obtained from the aforementioned digestion following the treatment with the separator before the digestion process was pre-impregnated with a boiling liquid. And the isolation therapy was combined with pre-impregnation as a single treatment. Complex metal compounds that Resulting in the same treatment And the excess non-reactive separator is sent with the material. The fibers were entered into the digestion process so that they were removed after digestion when the spent solution was removed. 2. The method referred to in item 1, characterized by a procedure using a pH separator approximately 5.0 higher. 3.The method referred to in Clause 1 is characterized by adding a separator to the liquid to 4. The method, as claimed in clause 1, characterizes that the separator was selected from a group containing diethylene, thiamine, pentacetic, ethylenediaminetetraacetic acid. Ndiamine tetracetic, nitrylothyacetic acid, oxalic acid, citric acid, tartaric acid, and diethylene thiaminepenes. Taphosphonic 5. Method referred to in Article 4, characterized by that the separator used is ethylene diamine tetracetic acid. 6. Method as referred. Rights in Article 4 are characterized by that the separator used is diethylene, thiamine, pentacetic and ethylene diamine tetracetic acid 7. 8. The method referred to in Article 7 looks at that the treatment with diphthyamine-pentacetic acid. Separation wizards have been done in The separate treatment container is located at the source of the digestion vessel. 9. The method referred to in Article 8 looks at that isolation and digestion aid therapy has been identified. It is included in the intermittent pulping process 1 0. The method referred to in Article 8 looks at that the separation and digestion aid therapy is It is included in the intermittent pulping process. 1 1.1 2. Method referred to in Article 11, where the temperature is at least 100 ํ C, the pressure is at least 5 bar, and the treatment duration is at least 40 min. 1 3. Methods referred to in Article 11, where the pressure is at least 10 bar, the duration of therapy is at least 60 minutes 1 4. Methods referred to in Article 11 that are characterized as being performed Therapy with a separate aid that Temperature of at least 80 ํ C, pressure at least 2 bar and for a period of at least 20 minutes 1 5. Method referred to in Article 14, characterized by a separation agent in quantities between 0.5-10 kg / m3. Per ton of fibrous material 1 6. Method referred to in Article 14 which uses a separation aid in the amount of 1.5-5 kg per tonne of dry fibrous material 1 7. Method referred to in Article 14 at It is characterized by using a separation aid in the amount of 2-4 kg per tonne of dry fibrous material. From cellulose fiber scraps Which includes the process Digest fiber material with digestion liquid There is no peroxide step before such digestion. Perform at least one process of fibrous residue treatment prior to digestion with a liquid with a separator. At least one can also form naturally occurring metal complexes in fibrous materials. The separator selected from a group containing nitrogen-containing polycarboxylic acids, nitrogen-free polycarboxylic acids and phosphonic acids. And were also selected from a group containing diethylene thiamine pen-tacetic acid, ethylene diamine tetracetic acid, nitrylothyacetic acid, Oxalic acid, citric acid, tartaric acid and diethylenyamine Pentaphosforic Which is treated with the separator and digested in the intermittent pulp production process. And the fibrous material treated with The separator is fed directly into the digestion process along with the resulting complex metal compound and the Help separate the excess That does not react 1 9. Methods for producing chemical membranes From cellulose fiber scraps Which consists of making Digest fiber material with digestion liquid Without the previous peroxide step Digestion The fibrous material is treated in at least one step before such digestion. With a liquid with a separator At least one can form a complex with naturally occurring metals in the fibrous material, the treated fibrous material is fed directly to the digestion process along with the metal compound. The resulting complexes and the inactive extraction auxiliaries. Pulp production Such is a discrete pattern 2 0. Method for producing chemical pulp. From cellulose fiber scraps Which consists of making Digest fiber material with digestion liquid Without the previous peroxide step To perform the sub At least one step of treatment of the fibrous material before digestion, with at least one liquid with a separator capable of forming complexes with naturally occurring metals in the fibrous material. One such procedure at pH above approximately 5.0 is performed with a separation and digestion agent in the intermittent pulp process. From treated fibrous material With the separator, it is fed directly to the digestion process along with the resulting complex metal compound and Non-reactive separation aid 2 1. Manufacturing method of chemical membranes. From cellulose fiber scraps Which consists of making Digest fiber material with digestion liquid Without the previous peroxide step To perform the sub At least one step of treatment of the fibrous material before digestion, with at least one liquid with a separator capable of forming complexes with naturally occurring metals in the fibrous material. One such procedure at pH above about 5.0 is done with the therapy. Separation and digestion aid in the pulp production process Discrete Fiber material treated with The separator is fed directly into the digestion process along with the resulting complex metal compound and the Helps to separate the excess unreactive in at least part of the liquid. Undergoing treatment of fibrous materials And has a separate helper It consists of one type of used solution, fresh digestion fluid, bleaching liquid, condensate, tap water or barrel water. Or a mixture of that substance, which the liquid is used to digest it as white lickers and treated with a separator in conjunction with the process Constant temperature boiling, including the last additional replacement process Which the operating conditions match General condition In the preceding digestion step significantly 2 2. The method referred to in Article 21 is characterized by removing lignin from the membranes. Oxygen gas after digestion 2. 3. The method referred to in Article 22 is that the membrane Was treated with a separate aid immediately Before elimination of lignin with oxygen gas 2 4. The method referred to in Article 22 is characterized by that the membranes having lignin with oxygen gas are The bleaching agent contains hydrogen peroxide 2 5. Methods referred to in Article 24, including the process of combining hydrogen peroxide with ozone 2. 6. Methods referred to in Article 24, which include procedures for Total hydrogen peroxide With peracetic acid 2 7. Any of the methods referred to in clause 18,20 or 21 That looks at at least part Large amounts of free liquids containing complex metal compounds were removed from the fibrous material at the end of the 8. The method referred to in Article 27 looks like that post-emptying washes the strands of material. Filament with a metal-free liquid or containing a low content of metal. 2. 9. Method referred to in clause 27 in which the liquid is removed from the strand material. Fiber after treatment with a separator It is sent directly to the evaporation system 3 0. The method referred to in Article 27 is that liquids containing complex metal compounds have no effect on liquids. It was removed by being replaced with a metal-free or low-metal liquid.3 1. The method referred to in Article 30, in which at least most of the liquid removed from the strand material. The fibers after the separation aid treatment were directed directly to the evaporation system 3. 2. Method for producing chemical pulp From cellulose fiber scraps Which consists of making Digest fiber material with digestion liquid Without the previous peroxide step To perform the sub To treat the fibers At at least one step prior to such digestion, with at least one liquid with a separator capable of forming a complex of naturally occurring metals in the fibrous material, at least one such step is performed at pH above about 5.0 acts the therapy. Separation and digestion aids in the intermittent pulp production process Fiber material treated with The separator is fed directly into the digestion process along with the resulting complex metal compound and the The non-reactive extraction aid before the digestion process, the fibrous material is pre-impregnated with boiling liquid and treated with the separator. It was combined with pre-impregnation as a single treatment. The complex metal compounds formed in the same treatment And the helper that is not The excess reaction is transmitted with the fibrous material into the digestion process in order to be eliminated after the process. Digestion when removing the used solution 3 3. Method for producing chemical pulp That has properties that have been improved from the waste material of cellulose fibers The methods include digestion of fibrous materials with digestion fluids. Without step Peroxide previous That have the characteristics that the fibrous material will be treated in at least one step Perform the digestion with at least one compound liquid that can form a complex. Can be with metals that are naturally present in fibrous materials The extraction agent was selected from a group containing nitroginius acid. Polycarboxylic acids, non-nitrogenic acid, polycarboxylic acid and phosphonic acid for the membranes obtained after the digestion process. The membranes, in addition to having a lower metal content, especially manganese, have at least 10% higher tear resistance, at least 5% higher viscosity and at least 1% higher yield than the corresponding parameters for the membranes produced. Up without Pre-treatment with a separate aid Calculated within the same Kappa number range