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Method for preparing sodium lignin sulfonate water reducer

The technology of sodium lignosulfonate and water reducing agent is applied in the field of preparing sodium lignosulfonate water reducing agent, can solve the problems of high operating cost, low alkali recovery rate and high benefit, and achieves low cost and high sulfonation degree , the effect of simple process

Active Publication Date: 2012-05-16
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the investment of alkali recovery technology is large. In addition, the pulping black liquor made of lignocellulosic raw materials has high silicon content, low alkali recovery rate, and operating costs are higher than recovered alkali; Physical and chemical methods such as flocculation and air flotation plus biochemical treatment methods such as activated sludge aeration or anaerobic fermentation, this type of technology also requires a large investment, occupies a large area, and has high operating costs. It does not require any Economic benefits and pollution control effects are not very satisfactory; the comprehensive utilization of resources requires less investment, high benefits, and turning waste into treasure

Method used

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  • Method for preparing sodium lignin sulfonate water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 1. Raw material and formula:

[0037] Black liquor: 75.7kg

[0038] Formaldehyde: 0.340kg

[0039] Sodium sulfite: 0.340kg

[0040] 2. Process steps and process parameters:

[0041] Be that the coarse filter (material is PP material) of 5 μm with aperture, carry out coarse filtration to black liquor, weight after filtering is 75.7kg, and solid content is 9.54%, and lignin content is 2.0%;

[0042] The coarse filtrate is subjected to ultrafiltration treatment. The pore size of the ultrafiltration membrane is 5000MD, and the material is an alkali-resistant membrane material (polyolefin, American Hyde Energy Company). During ultrafiltration, the inlet pressure is controlled not to exceed 25kgf / cm 2 , differential pressure 1kgf / cm 2 Within the range, the temperature does not exceed 40°C, and the treatment time is 5 hours. After the treatment, the clear liquid is recycled to the alkali boiling process for use. The weight of the concentrated liquid is 12.8kg, of which the...

Embodiment 2

[0046] 1. Raw material and formula:

[0047] Black liquor: 121.765kg

[0048] Formaldehyde: 0.365kg

[0049] Sodium sulfite: 0.365kg

[0050] 2. Process steps and process parameters:

[0051] Use a coarse filter with a pore size of 1-10 μm, made of PP material, to coarsely filter the black liquor. After filtering, the weight is 121.765kg, the solid content is 6.59%, and the lignin content is 1.3%.

[0052] The coarse filtrate is subjected to ultrafiltration treatment. The pore size of the ultrafiltration membrane is 10000MD, and the material is an alkali-resistant membrane material (polyethersulfone, German Meynard company). During ultrafiltration, the inlet pressure is controlled not to exceed 15kgf / cm 2 , differential pressure 2kgf / cm 2 Within the range, the temperature does not exceed 40°C, and the treatment time is 10.72 hours. After the treatment, the clear liquid is recycled to the alkali boiling process for use. The weight of the concentrated liquid is 14.63 kg, of ...

Embodiment 3

[0056] 1. Raw material and formula:

[0057] Black liquor: 122.4kg

[0058] Formaldehyde: 0.519kg

[0059] Sodium sulfite: 0.519kg

[0060] 2. Process steps and process parameters:

[0061] With the coarse filter (material is PP material) that aperture is 1-10 μ m, carry out coarse filtration to black liquor, weight after filtering is 122.4kg, and solid content is 9.79%, and lignin content is 2.2%;

[0062] The coarse filtrate is subjected to ultrafiltration treatment. The pore size of the ultrafiltration membrane is 2000MD, and the material is an alkali-resistant membrane material (the material is polysulfone, American Koch Company). ℃, the treatment time is 10.9h, and the clear liquid after treatment is recycled to the alkali boiling process for use. The weight of the concentrated liquid is 20.2kg, of which the solid content is 31.55%, and the lignin is 11.63%;

[0063] Take 14.865kg of concentrated liquid for sulfonation test, add 519g of formaldehyde, raise the tempera...

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Abstract

The invention relates to a method for preparing sodium lignin sulfonate water reducer. Black liquor which is generated by alkali cooking corncobs, acidolysis residue of the corncobs, bagasse or corn stalks is taken as a raw material, and then the sodium lignin sulfonate water reducer of low water content is prepared after coarse filtration, ultrafiltration membrane concentration, sulfonation and spray drying. Aiming at the characteristics of the raw material, the coarse filtration and ultrafiltration are combined, cellulose, other impurities and the like can be removed by the coarse filtration, lignin can be retained by the ultrafiltration, and the aim of black liquor concentration can be realized at the same time of going through alkali so as to recover and reuse the alkali; the sulfonation method, which can be operated at room temperature and pressure, is adopted, and the sulfonation degree is high. Compared with the existing method, the method for preparing the sodium lignin sulfonate water reducer has no pollution to the environment, the processes are simple and convenient, and the cost is low.

Description

technical field [0001] The invention relates to the field of natural polymer materials, in particular to a method for preparing a sodium lignin sulfonate water reducer by using corncobs, corncob acid hydrolyzed slag, bagasse or corn stalks boiled with alkali as raw materials. Background technique [0002] Lignin is one of the most abundant renewable resources on the earth. As a natural polymer with three-dimensional structure, lignin widely exists in higher vascular plants, especially in woody plants. [0003] The amount of lignin in nature is very large, lignocellulosic raw materials contain three parts: cellulose, lignin and hemicellulose (polysaccharides), straw sugar only uses cellulose in lignocellulose (accounting for about 40 %), and wherein about 25% of lignin and about 28% of hemicellulose and xylose, potassium, nitrogen, phosphorus and the like are discarded with the black liquor. The lignin, hemicellulose, xylose, potassium, nitrogen, phosphorus and other substan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08H5/02C04B24/18C04B103/30
Inventor 李荣杰薛培俭邓远德张雪锋张毅
Owner ANHUI BBCA FERMENTATION TECH ENG RES
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