Dissolving pulp sodium lignosulfonate dispersant, and reducing preparation method and application thereof

A technology of sodium lignosulfonate and dissolving pulp, which is applied in the fields of dissolution, chemical instruments and methods, transportation and packaging, etc., and can solve the problem of unsatisfactory dispersibility of lignosulfonated products, complex components of dissolving pulp waste liquid, and limited promotion Issues such as the scope of application to achieve the effect of alleviating the crisis, improving the competitiveness of enterprises, and applying a wide range of industries

Active Publication Date: 2012-05-09
FUZHOU UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] But in general, the dispersibility of lignin sulfonated products is not ideal enough, which limits its application range
And because the composition of the dissolving pulp waste liquid is complex and has a strong pungent smell
Therefore, utilize conventional method and above domestic and international research method, all can not well solve these problems, so the present invention provides a kind of reduction technology preparation sodium lignosulfonate method for this type of waste liquid, can not only improve the synthesis of product like this Performance (such as molecular weight, concrete late strength, fluidity, cement adaptability and temperature adaptability range, etc.), while removing the irritating smell of waste liquid, making the product smell milder

Method used

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  • Dissolving pulp sodium lignosulfonate dispersant, and reducing preparation method and application thereof
  • Dissolving pulp sodium lignosulfonate dispersant, and reducing preparation method and application thereof
  • Dissolving pulp sodium lignosulfonate dispersant, and reducing preparation method and application thereof

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preparation example Construction

[0026]The reduction preparation method of the dissolving pulp sodium lignosulfonate dispersant comprises the following steps: concentrating the dissolving pulp waste liquid to a solid content of 20-60%, adding a catalyst, and reacting at 40-130°C for 0.5-1.5h; adding acid to adjust Adjust the pH value of the system to 10-13, adjust the temperature to 80-160°C, add sulfonating agent, aldehyde compound, water, and react for 2-5 hours; then adjust the system temperature to 60-130°C, add reducing agent and react again 0.5 ~ 2h to obtain brown black or dark brown liquid, after spray drying to obtain dark brown or dark brown powdery sodium lignosulfonate dispersant; the mass percentage of each raw material is as follows:

[0027] Dissolving pulp waste liquid: 50~85%

[0028] Catalyst: 0.01~0.1%

[0029] Acid regulator: 1.3~5.2%

[0030] Sulfonating agent: 2~8.3%

[0031] Aldehyde compounds: 1.8~8%

[0032] Reducing agent: 0.5~10%

[0033] Water: 2-28%.

[0034] Wherein said di...

Embodiment 1

[0038] (1) Raw material and dosage

[0039] Masson pine dissolving pulp waste liquid (20% solid content): 850.0 Kg

[0040] Mixture of ferrous sulfate and cobalt sulfate (9:1 mass ratio): 0.5 Kg

[0041] Mixture of phosphoric acid and gluconic acid (mass ratio 2:3): 38.5 Kg

[0042] Sodium bisulfite: 20.0 Kg

[0043] Formaldehyde: 55.9 Kg

[0044] Thiourea dioxide: 15.1 Kg

[0045] Water: 20.0 Kg

[0046] (2) Process steps and parameters

[0047] Concentrate the dissolving pulp waste liquid of masson pine to a solid content of 20%, pump 850.0 Kg into the reactor, add 0.5 Kg of a mixture of ferrous sulfate and cobalt sulfate, and react at a temperature of 60°C for 1 hour; add 38.5 The mixture of Kg phosphoric acid and gluconic acid adjusted the pH of the system to 10, raised the temperature to 100°C, and added a mixture of 20.0 Kg sodium bisulfite, 55.9 Kg formaldehyde, and 20.0 Kg water to react for 4 hours; then lowered the system temperature to 90°C, added 15.1 Kg of ...

Embodiment 2

[0049] (1) Raw material and dosage

[0050] Masson pine and birch dissolving pulp waste mixture (mass ratio 3:2, solid content 26%): 844 Kg

[0051] Mixture of ferrous sulfate, copper sulfate and cobalt sulfate (mass ratio 7:2:1): 0.2 Kg

[0052] Mixture of sulfamic acid and amino acid (mass ratio 1:1): 23.5 Kg

[0053] Mixture of sodium bisulfite and sodium sulfite (mass ratio 2: 1): 58.4 Kg

[0054] Mixture of formaldehyde and paraformaldehyde (mass ratio 4:1): 18.0 Kg

[0055] Mixture of sodium dithionite and thiourea dioxide (mass ratio 1:1): 5.0 Kg

[0056] Water: 50.9 Kg

[0057] (2) Process steps and parameters

[0058] Concentrate the masson pine and birch dissolving pulp waste liquid mixture to a solid content of 26%, pump 844.0 Kg into the reactor, and add 0.2 Kg of ferrous sulfate, copper sulfate and cobalt sulfate mixture, at a temperature of 70 ° C 23.5 Kg of sulfamic acid and amino acid mixture were added to adjust the pH of the system to 12, and the temper...

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Abstract

The invention discloses a dissolving pulp sodium lignosulfonate dispersant, and a reducing preparation method and application thereof. Based on a concentrated dissolving pulp waste liquid, the lignose activity is improved under the action of a catalyst, then subjected to sulfomethylation reaction, subjected to reducing reaction to obtain a brownish-black or dark brown liquid, and subjected to spray drying to obtain a dark brown or nut-brown powdered sodium lignosulfonate dispersant, wherein the weight-average molecular weight Mw is 6000-40000, and the number-average molecular weight Mn is 3000-20000. The product can be widely used for concrete admixtures, dye dispersants and coal water slurry additives; each property of the product can meet the related quality standard requirements; and the product has the advantages of simple preparation process, moderate conditions, conventional equipment, low production cost and no emission of three wastes in the production process, and can achieve the purpose of changing wastes into valuables, thereby having popularization and application values.

Description

technical field [0001] The invention belongs to the fields of fine chemicals, environment-friendly materials and dispersants, and in particular relates to a dissolving pulp sodium lignosulfonate dispersant and its reduction preparation method and application. Background technique [0002] Dissolving pulp, also known as special pulp, or refined pulp, is mainly used as viscose fiber for the production of textile raw materials. Raw materials for cellulose, cellulose ether and other products. Dissolving pulp can usually be produced from masson pine, eucalyptus, oak, poplar and birch, and bamboo can also be used as a raw material for producing dissolving pulp. my country is a big textile country, and its output ranks first in the world. With the rapid development of the textile industry, the contradiction in demand for various fiber raw materials has also been exacerbated, especially the petrochemical products used as chemical fiber raw materials are in short supply. The shorta...

Claims

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Application Information

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IPC IPC(8): B01F17/50C08H7/00C04B24/18C10L1/24C04B103/40C09K23/50
Inventor 刘明华田晨张育乾刘剑锋
Owner FUZHOU UNIVERSITY
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