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Lignosulfonate prepared from ground wood pulp waste liquor and preparation process thereof

A lignosulfonate and preparation technology, which is applied in the field of lignosulfonate and its preparation technology, can solve the problems of low utilization rate, easy foaming, high chroma, etc., and achieve low production cost, mild conditions, and high production efficiency. The effect of simple process

Active Publication Date: 2013-06-05
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Groundwood pulp waste liquid is a by-product of various groundwood pulping processes. It contains a large amount of lignin components, but its utilization rate is very low at present. Instead, it is a kind of water pollutant that is difficult to treat. Its COD Cr , BOD, SS content is very large, high chroma, very smelly, easy to foam after dilution

Method used

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  • Lignosulfonate prepared from ground wood pulp waste liquor and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 1. Raw material and dosage

[0049] Masson pine stone groundwood (SGW) waste liquor (20% solids): 900.0 Kg

[0050] Ethylene oxide: 10.0 Kg

[0051] Mixture of sodium sulfite and sodium metabisulfite (mass ratio 2:3): 30.0 Kg

[0052] Mixture of sodium hydroxide and sodium carbonate (mass ratio 1:9): 28.0 Kg

[0053] Formaldehyde: 32.0 Kg

[0054] 2. Process steps and parameters

[0055] Concentrate the waste liquid of masson pine groundwood pulp (SGW) to a solid content of 20% with a concentrator, pump 900.0 Kg into the reactor, raise the temperature of the system to 130°C, and add 10.0 Kg of ethylene oxide Add 30.0 Kg of sodium sulfite and sodium pyrosulfite mixture after 2 h of reaction, add 28.0 Kg of sodium hydroxide and sodium carbonate mixture at the same time, slowly add 32.0 Kg of formaldehyde after 4 h of reaction, discharge after 1 h of reaction, both can get brown black or Brown liquid product, the liquid product is made into yellow-brown or dark brown ...

Embodiment 2

[0057] 1. Raw materials and dosage:

[0058] Masson pine and pine fir biomechanical pulp (BMP), sulfonated chemical mechanical pulp (SCMP) mixed waste liquid (mass ratio 1:1, solid content 30%): 850.0 Kg

[0059] Propylene oxide: 17.8 Kg

[0060] Calcium bisulfite: 48.4 Kg

[0061] Calcium Oxide: 35.7 Kg

[0062] Formaldehyde: 45.5 Kg

[0063] 2. Process steps and parameters:

[0064] Concentrate the mixed waste liquid of biomechanical pulp (BMP) and sulfonated chemical mechanical pulp (SCMP) of masson pine and pine fir to a solid content of 30% with a concentrator, and pump 850.0 Kg into the reactor, and raise the temperature of the system to to 90°C, add 17.8 Kg of propylene oxide to react for 2 hours, then add 48.4 Kg of calcium bisulfite, and at the same time add 35.7 Kg of calcium oxide, slowly add 45.5 Kg of formaldehyde after 2.5 hours of reaction, and discharge the material after 5 hours of reaction to obtain brown Black or brown liquid product, the liquid produ...

Embodiment 3

[0066] 1. Raw materials and dosage:

[0067] Mixed waste liquid of stone ground wood pulp (SGW) and pressure ground wood pulp (PGW) of masson pine and ichthyosaur pine (mass ratio 1:1, solid content 35%): 850.0 Kg

[0068] Propylene oxide: 17.1 Kg

[0069] Mixture of sodium bisulfite and sodium metabisulfite (mass ratio 2:3): 52.5 Kg

[0070] Mixture of sodium hydroxide, potassium hydroxide and urea (mass ratio 2:1:7): ​​32.8 Kg

[0071] Mixture of formaldehyde and paraformaldehyde (3:1 mass ratio): 47.6 Kg

[0072] 2. Process steps and parameters:

[0073] Concentrate the mixed waste liquid of masson pine and ichthyosis pine (SGW) and pressure groundwood pulp (PGW) to a solid content of 35% with a concentrator, and pump 850.0 Kg into the reactor. The temperature of the system was raised to 110°C, and 17.1 Kg of propylene oxide was added to react for 3 hours, then a mixture of 52.5 Kg of sodium bisulfite and sodium metabisulfite was added, and a mixture of 32.8 Kg of sodiu...

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Abstract

The invention relates to lignosulfonate prepared from ground wood pulp waste liquor and a preparation process thereof. The lignosulfonate has molecular weight of 15,000 to 80,000 and is a brownish black or brown liquid product; the pH (potential of hydrogen) value of the lignosulfonate is in the range of 7 to 9; or the product is subjected to spray drying to obtain yellowish-brown or nigger-brownpowder solid; and the preparation process of the lignosulfonate comprises the following step that the concentrate ground wood pulp waste liquor is subjected to etherification, sulfonation reaction and condensation reaction sequentially to obtain the lignosulfonate. The product is widely used for a concrete admixture, a dye dispersant, a coal water slurry additive and other industries. All the performances of the product can meet the requirements of related quality standards. The lignosulfonate product has high dispersion liquidity. The preparation process is simple. The condition is mild. Conventional equipment is adopted. The production cost is low. The aim of changing waste materials into things of value is fulfilled. No three wastes are discharged in the production process. The lignosulfonate has popularization and application value.

Description

technical field [0001] The invention belongs to the fields of fine chemical industry and environment-friendly materials, and more specifically relates to a lignin sulfonate prepared from groundwood pulp waste liquid and a preparation process thereof. Background technique [0002] Due to the limited reserves of non-renewable resources such as coal, oil, and natural gas, and the increasingly serious impact of their development and utilization on the earth's ecological environment, this has prompted the vigorous development of polymer materials that use renewable resources as raw materials. Lignin is the only non-petroleum renewable resource that can provide aryl compounds in nature. It, together with cellulose and hemicellulose, is the main component of the plant skeleton. Its content in land plants is second only to cellulose, and is the second largest. natural organic matter. It is estimated that 150 billion tons of lignin are produced annually worldwide from plant growth. ...

Claims

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Application Information

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IPC IPC(8): C08H7/00
Inventor 刘明华张育乾
Owner FUZHOU UNIV
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