Method for preparing lignin sodium sulfonate dispersant through advanced catalytic oxidation

A technology of sodium lignosulfonate and advanced catalytic oxidation, which is applied in chemical instruments and methods, chemical/physical processes, transportation and packaging, etc. Improve sulfonation effect, solve the problem of black liquor pollution, and simple production process

Active Publication Date: 2011-08-17
FUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But in general, the dispersibility of alkali lignin sulfonated products is not ideal, which limits its application range

Method used

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  • Method for preparing lignin sodium sulfonate dispersant through advanced catalytic oxidation
  • Method for preparing lignin sodium sulfonate dispersant through advanced catalytic oxidation
  • Method for preparing lignin sodium sulfonate dispersant through advanced catalytic oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. The raw material components used in this embodiment are as follows (unit——kilogram):

[0040] Pulping black liquor (bamboo and masson pine pulping black liquor mixed, mass ratio 1:1, solid content 40%): 200 kg

[0041] Catalyst (mixture of ferrous sulfate / copper sulfate / sodium gluconate, mass ratio 1:1:0.1): 0.047 kg

[0042] Hydrogen peroxide (30% content): 5.5 kg

[0043] Concentrated sulfuric acid (98% content): 1.02 kg

[0044] Sodium α-hydroxymethanesulfonate: 19.44 kg

[0045] Water: 81.9 kg

[0046] 2. Preparation process steps and parameters

[0047] (1) Catalytic oxidation: Mix 0.047 kg of catalyst and 0.11 kg of water to make a 30% solution, mix it with 200 kg of pulping black liquor with a solid content of 40%, add it to the reactor, and react at 35°C for 30 minutes. Add 5.5kg of hydrogen peroxide and react at 80°C for 30min. Then use 1.02 kg of concentrated sulfuric acid and 4.0 kg of water to make a 20% solution, and adjust the pH of the system to...

Embodiment 2

[0050] 1. The raw material components used in this embodiment are as follows (unit——kilogram):

[0051] Pulping black liquor (mixed straw and birch pulp black liquor, mass ratio 3:2, solid content 52%): 850 kg

[0052] Catalyst (mixture of ferrous chloride / cobalt nitrate / thiourea dioxide, mass ratio 0.5:1:0.2): 0.1 kg

[0053] Potassium permanganate: 6.0 kg

[0054] Concentrated phosphoric acid (85% content): 3.0 kg

[0055] Sodium α-hydroxymethanesulfonate: 41.0 kg

[0056] Water: 100.0 kg

[0057] 2. Preparation process steps and parameters

[0058] (1) Catalytic oxidation: Mix 0.1 kg of catalyst and 0.4 kg of water into a 20% solution, mix it with 850 kg of pulping black liquor with a solid content of 52%, add it to the reactor, and react at 40°C for 20 minutes. Mix 6.0 kg of potassium permanganate and 14.0 kg of water to form a 30% solution, add it to the above reaction system at 60°C, and react for 45 minutes. Then use 9.8 kg of concentrated phosphoric acid and 24....

Embodiment 3

[0061] 1. The raw material components used in this embodiment are as follows (unit——kilogram):

[0062] Pulping black liquor (wheat straw and reed pulping black liquor mixed, mass ratio 1:4, solid content 35%): 100 kg

[0063] Catalyst (mixture of nickel sulfate / cobalt nitrate, mass ratio 3:1): 0.035 kg

[0064] Peracetic acid (35% content): 5.1 kg

[0065] Citric acid: 0.76 kg

[0066] Sodium alpha-hydroxymethanesulfonate: 15.87 kg

[0067] Water: 87.65 kg

[0068] 2. Preparation process steps and parameters

[0069] (1) Catalytic oxidation: 0.035 kg of catalyst and 0.32 kg of water are prepared into a 10% solution, mixed with 100 kg of pulping black liquor with a solid content of 35%, added to the reactor, and reacted at 60°C for 30 minutes. Add 5.1 kg of peracetic acid and react at 80°C for 60 min. Then use 0.76 kg of citric acid and 6.84 kg of water to make a 10% solution, and adjust the pH of the system to 13.0.

[0070] (2) Sulfomethylation: Mix 15.87 kg of sodiu...

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Abstract

The invention discloses a method for preparing lignin sodium sulfonate dispersant through advanced catalytic oxidation, comprising the following steps: adding a catalyst to a raw material (black pulp-making liquor containing 20-60% of solid), and subjecting the pulp-making liquor to reaction for 15-120 minutes at the reaction temperature of 30-95 DEG C; adding an oxidant, subjecting the pulp-making liquor to reaction for 15-120 minutes at the reaction temperature of 30-95 DEG C, adding an acidity regulator to regulate the pH value of a reaction system to 10.5-13.5, adding alpha-hydroxymethyl sodium sulfonate, subjecting the materials to reaction for 3-8 hours at the reaction temperature of 95-150 DEG C, decreasing the temperature, and discharging the product which is brown-black liquor, and carrying out spray-drying to obtain brown solid powder. The prepared dispersant has various functions of dispersing, complexing, chelating and the like and can be used in various fields of the dye dispersant, the concrete water reducer, the coal-water slurry additive and the like. The method has the advantages of simple preparation step, low cost, readily available raw material, short production cycle, mild reaction and no discharge of 'three wastes' during production, thereby being a clean and environmental-friendly process.

Description

technical field [0001] The invention relates to the field of dispersants, in particular to a method for preparing sodium lignosulfonate dispersants by advanced catalytic oxidation. Background technique [0002] In recent years, due to the increasing emphasis on environmental protection around the world, as well as the worldwide energy crisis and the increasing shortage of cellulose raw materials, the utilization of lignin, a natural resource with a huge content, has attracted more and more attention from all over the world. In nature, the reserve of lignin is second only to cellulose, and it is regenerated at a rate of 50 billion tons every year. The pulp and paper industry separates about 140 million tons of cellulose from plants each year, while obtaining about 50 million tons of lignin by-products [1] . The use of alkaline pulping accounts for about 80% of my country's paper industry. Among these production enterprises, except for a few large factories, many of them are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H7/00B01F17/50C09K23/50
Inventor 刘明华田晨吕源财
Owner FUZHOU UNIV
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