A method of manufacturing paper pulp

 

(57) Abstract:

The method relates to the field of pulp and paper industry, namely the production of paper pulp in the production of printing and book and magazine paper. Prepare a water-fibrous dispersion. Fill it, glue and precipitated coagulant and flocculant. As coagulant use the titanyl sulphate and ammonium. As flocculant use polysulfonamide MM 2500 - 3000, or a copolymer of methacrylamide with the ammonium salt of methacrylic acid MM 10000 to 100000, or a copolymer of piperylene with Acrylonitrile 10000 MM, or a copolymer of piperylene methacrylic acid 10000 MM. The technical result consists in increasing the efficiency of paper production, increase the degree of retention of paper pulp by 29 and 38%, reducing consumption of flocculants, the improvement of physical and mechanical properties of paper and reduction of wood consumption per unit of production. 1 C.p. f-crystals, 1 table.

The invention relates to the field of pulp and paper industry, and in particular to methods of manufacturing paper pulp in the manufacture of book and magazine paper and printing paper.

From a large number of organic polymers, synthesized the guy, investigated as flocculants limited number of them. The results of the use of cationic and anionic polyelectrolytes brands "Perkol", "Zetag", "Magna", etc. to streamline the process, improve the quality of the paper is given in the publications. Monomeric structure and functional composition are not published.

Known method of preparing paper pulp, in which the coagulant used aluminum sulfate, and the flocculant is polyacrylamide (see below) (Ivanov, S. N. Technology paper, in "Forest industry", M , 1970, S. 140, 141-189, 192, 195, 233-235, 238, 239-242).

However, the disadvantages of this method are: high enough degree of dehydration, the low retention of paper pulp on a grid table, the PM and not enough high physical-mechanical properties of the product.

The total surface charge of the dispersed phase dispersions of fibrous wood material and filler has the greatest influence on the strength of coupling between the individual fibers and filler particles and, consequently, the degree of retention of the mass. Found that water-soluble synthetic polymers and copolymers as a result of their adsorption of macromolecules on the surface of the fibers and filler particles, sposobnastyami reload.

The present invention is the use of domestic synthetic water-soluble polymers and copolymers as a flocculant for the manufacture of paper pulp in the production of printing and book and magazine paper in the pulp and paper industry, which would increase the degree of retention of paper pulp on a grid table, greatly increase the degree of retention of kaolin, to improve the properties of paper, to reduce the cost of flocculant, and, ultimately, to reduce wood consumption per unit of production in accordance with economic and environmental requirements.

This is the technical result, which is in causal connection with the essential features.

The essential features of the invention are: the preparation of an aqueous fiber dispersion, filling, sizing and sedimentation with coagulant and flocculant, coagulant used the titanyl sulphate and ammonium, as flocculant used water-soluble synthetic organic polymers and copolymers, monomers which contain functional groups: or amide (2) or carboxyl (4) or sulfonic (1) or nitrile (3), can due to adsorption of macromanage dispersed phase, to change the structure of the dispersion of paper pulp, to enhance flocculation by increasing the electrostatic component of the interaction forces, resulting in increased retention of paper pulp on 29-38%, 9-21%, increases breaking length, improve the properties of paper, with the use

(1) (KK-1) Polysulfonamide chloride MM2500-3000

Structure

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or (2) (KK-2) a Copolymer of methacrylamide with the ammonium salt of methacrylic acid MM 10000-100000

Structure

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or (3) (KK-3) a Copolymer of piperylene with Acrylonitrile MM 10000

Structure

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or (4) (KK-4) Copolymer of piperylene methacrylic acid MM 100000

Structure

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where m, n is the number of monomers in a macromolecule polymer.

Castings were prepared listonline apparatus LA-2 JSC "Syktyvkar". As a control sample for comparison was taken polyacrylamide as coagulant-titanyl sulphate and ammonium concentrations in technological.

Example 1. Preparing fibrous mass containing 15% softwood pulp, 10% hardwood pulp, 75% thermomechanical pulp. To the fibrous mass was added to the kaolin at a flow rate of 140 kg/t, the adhesive at the rate of 21 tons, polyacrylamide at a flow rate of 0.44 kg/t, Sul the ode 0.3 kg/t, the titanyl sulphate and ammonium at a flow rate of 6 kg/T. From the cooked pulp was prepared casting. Results: the retention weight - for 70.1%, the rate of dehydration - 0,36 l/min, breaking length - 2670 m, the resistance of the surface to picking - 1,31, flaking to 0.44.

Example 2. Preparing fibrous mass, as in example 1. To the fibrous mass was added to the kaolin at a flow rate of 140 kg/t, the adhesive at the rate of 21 kg/t, polysulfonamide chloride (KK-1) at a flow rate of 0.3 kg/t, the titanyl sulphate and ammonium at a flow rate of 6 kg/so results: hold the mass of 96.5%, the rate of dehydration - 0,38 l/min, breaking length - 3100 m, the resistance of the surface to the plucking is 1.35, flaking - 0,40.

Example 3. Preparing fibrous mass, as in example 1. To the fibrous mass was added to the kaolin at a flow rate of 140 kg/t, the adhesive at the rate of 21 kg/t, copolymer of methacrylamide with the ammonium salt of methacrylic acid (KK-2), titanyl sulphate and ammonium at a flow rate of 6 kg/so results: hold the mass of 91.6%, the rate of dehydration - 0,37 l/m, breaking length - 3050 m, the resistance of the surface to the plucking is 1.34, flaking - 0,39.

Example 4. The composition of the paper pulp is the same as in example 1. As the flocculant added to the copolymer of piperylene with acrylonitrite: hold mass 90.4% of the speed of dehydration 0,31 l/m, breaking length - 2910, resistance to plucking - 1,36, flaking - 0,38.

Example 5. The composition of the paper pulp is the same as in example 1. As the flocculant added to the copolymer of piperylene methacrylic acid (KK-4) at a flow rate of 0.3 kg/t, as a coagulant - titanyl sulphate and ammonium at a flow rate of 6 kg/so results: retention mass - 89,0%, the rate of dehydration - 0,29 l/min, breaking wave - 3150 m, resistance to plucking is 1.34, flaking - 0,38.

As follows from the presented data (see table), the use of water-soluble organic polymer polysulfonamide 2500-3000 MM and copolymers of piperylene methacrylic acid 10000 MM, piperylene with Acrylonitrile MM 10000 and methacrylamide with the ammonium salt of methacrylic acid MM 10000-100000 as a flocculant and titanyl sulphate and ammonium as a coagulant composed of paper pulp in paper production, owing to a strengthening of the forces of interaction between the components of paper pulp to increase retention mass 29-38%, 9-21% to increase the rate of "breaking length" and to improve the properties of paper on indicators of "resistance to plucking" and "flaking". Thus, significantly reduces the consumption of the tree of the fiber dispersion, the filling, sizing and sedimentation with coagulant and flocculant, characterized in that as a coagulant use the titanyl sulphate and ammonium, and as a flocculant use synthetic water-soluble organic polymers and copolymers, containing in its composition or amide, or carboxyl, or sulfonic, or nitrile group, can due to the adsorption of macromolecules of polymers and copolymers of the fibers and filler particles to change the magnitude and sign of the surface charge of the dispersed phase and the structure of the variance of the paper pulp, as a polymer containing a sulfonic group, use polysulfonamide MM 2500 - 3000 (KK-1), structural formulas

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as the polymer containing amide group, use the copolymer methacrylamide with the ammonium salt of methacrylic acid MM 10000 - 100000 (ACS-2), structural formula

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as the polymer containing nitrile group, using a copolymer of piperylene with Acrylonitrile 10000 MM (ck-3), structural formula

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as the polymer containing a carboxyl group is used, the copolymer of piperylene methacrylic acid 10000 MM (ck-4), the structural formula

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where m, n is the number of the leaves of 0.3 kg/T.

 

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