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Method for recovering papermaking black liquor liquid soda

A paper-making black liquor and liquid alkali technology, applied in the regeneration of alkali liquor, etc., can solve the problems of increasing the salt content of organic fertilizer, affecting the quality of organic fertilizer, and high conversion cost, so as to increase the compressive strength and anti-osmotic pressure Impact ability, fast resin exchange speed, and improved wear resistance

Inactive Publication Date: 2007-01-03
NORTHWEST A & F UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The content of sodium ion in black liquor is about 0.8-2.5%, and it exists in the form of complex multi-compounds such as sodium humate, sodium cellulose sulfonate, sodium hydroxide, sodium carbonate, etc., and conventional chemical conversion methods will increase the amount of organic fertilizer The added salt content will affect the quality of organic fertilizer, and the conversion cost is very high

Method used

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  • Method for recovering papermaking black liquor liquid soda

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Embodiment 1. Styrene 82.0g, 55.60% divinylbenzene 18.0g, vinyl acetate 8.0g, dicyclopentadiene 1.0g, benzoyl peroxide 1.1g, 300# liquid paraffin 81.8g. Stir for more than 0.5 hours to make it evenly mixed. Add to the water phase which has been warmed to 40°C. The aqueous phase consists of 400ml of 10% saline and 3.2g of pre-swollen gelatin. After putting the oil phase into the water phase, let it stand for 10 minutes. Start stirring, heat up to 80°C, adjust the stirring speed during the heating process, so that the particle size of the beads is within the required range. The reaction was incubated at 80°C for 3 hours to finalize the beads. Then the temperature was raised to 90° C., and the temperature was kept for 2 hours. Then the temperature was raised to above 95°C and kept for 8 hours. Polymerization is complete. The beads are filtered out, loaded into an exchange column, and the porogen in the beads is extracted with acetone, and the acetone used for extract...

Embodiment 2

[0046] Embodiment 2. Styrene 77.0g, 55.60% divinylbenzene 10.8g, acrylonitrile 5.0g, triallyl isocyanate 6.0g, benzoyl peroxide 1.0g, 200# solvent naphtha 60.0g. Stir for more than 0.5 hours to make it evenly mixed. Add to the water phase which has been warmed to 40°C. The aqueous phase consists of 400ml of 10% saline and 1.0g of pre-swollen hydroxymethylcellulose. After putting the oil phase into the water phase, let it stand for 10 minutes. Start stirring, heat up to 65°C, adjust the stirring speed during the heating process, so that the particle size of the beads is within the required range. The reaction was held at 65°C for 2 hours, then raised to 80°C for 3 hours. Then the temperature was raised to 90° C., and the temperature was kept for 2 hours. Then the temperature was raised to above 95°C and kept for 8 hours. Polymerization is complete. The beads are filtered out, loaded into an exchange column, and the porogen in the beads is extracted with acetone, and the a...

Embodiment 3

[0047] Embodiment 3. Methyl acrylate 77.0g, 55.60% divinylbenzene 5.4g, acrylonitrile 5.0g, triallyl isocyanate 6.0g, benzoyl peroxide 1.0g, 200# solvent naphtha 60.0g. Stir for more than 0.5 hours to make it evenly mixed. Add to the water phase which has been warmed to 40°C. The aqueous phase consists of 400ml of 20% saline and 1.0g of pre-swollen hydroxyethylcellulose. After putting the oil phase into the water phase, let it stand for 10 minutes. Start stirring, heat up to 65°C, adjust the stirring speed during the heating process, so that the particle size of the beads is within the required range. The reaction was held at 65°C for 2 hours, then raised to 80°C for 3 hours. Then the temperature was raised to 90° C., and the temperature was kept for 2 hours. Then the temperature was raised to above 95°C and kept for 8 hours. Polymerization is complete. The beads are filtered out, loaded into an exchange column, and the porogen in the beads is extracted with water vapor....

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Abstract

The present invention relates to a method for recovering liquid alkali from papermaking black liquor. It is characterized by that it adopts on ion exchange process to convert sodium ions into ammonium ions, so that it not only can eliminate the hazard of sodium hydroxide and sodium sulfite, but also can increase fertilizer effect, besides, it can completely control papermaking black liquor so as to attain the goal of pollution-free discharge. Besides, said invention also provides the concrete technical scheme and its concrete implementation steps.

Description

1. Technical field: [0001] The invention relates to a method for converting sodium ions in papermaking black liquor into sodium hydroxide, in particular to a method for recovering liquid alkali from papermaking black liquor, which is characterized in that sodium ions are extracted by resin, concentrated, and prepared by causticizing 3-20% caustic soda solution. 2. Background technology: [0002] At present, due to the limitation of timber resources in China, 70-80% of the raw materials in the papermaking industry are herbaceous plants such as reeds and wheat straw, and the papermaking method is made of straw pulp. [0003] As everyone knows, after straw pulp papermaking method adds sodium hydroxide cooking with wheat straw etc., cellulose is dissociated to become paper pulp, and its weight only accounts for about 40% of wheat straw weight. The rest is a small amount of lignin, hemicellulose (non-water soluble), and a large amount of complex large molecular weight compounds ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04
Inventor 刘存寿张运魏巧云方日尧
Owner NORTHWEST A & F UNIV
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