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, which can solve the problems of low alkali recovery rate, large floor space and high operating cost, and achieves simple process and sulfonation. High-quality, low-cost effect

Active Publication Date: 2010-06-30
ANHUI BBCA FERMENTATION TECH ENG RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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 materials and formula:

[0037] Black liquor: 75.7kg

[0038] Formaldehyde: 0.340kg

[0039] Sodium sulfite: 0.340kg

[0040] 2. Process steps and process parameters:

[0041] Use a coarse filter with a pore size of 5 μm (the material is PP material) to coarsely filter the black liquor, the weight after filtration is 75.7kg, the solid content is 9.54%, and the lignin content is 2.0%;

[0042] The crude filtrate is subjected to ultrafiltration treatment. The pore size of the ultrafiltration membrane is 5000MD, and the material is an alkali-resistant membrane material (the material is polyolefin, American Hyde Energy Corporation). During ultrafiltration, the inlet pressure should not exceed 25kgf / cm 2 , differential pressure 1kgf / cm 2 The temperature does not exceed 40°C, the treatment time is 5h, and the supernatant after treatment is recovered to be used in the alkaline cooking process. The weight of the dope is 12.8kg, of which the solid content is 27.95%, a...

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 lignosulfonate water-reducing agent by using corncob, corncob acid-hydrolyzed residue, sugarcane bagasse or corn stover black liquor after alkali cooking as raw materials. Background technique [0002] Lignin is one of the most abundant renewable resources on 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, and lignocellulose raw materials contain three parts: cellulose, lignin and hemicellulose (polysaccharides). %), and about 25% of lignin and about 28% of hemicellulose, as well as xylose, potassium, nitrogen, phosphorus, etc., are discarded with black liquor. The lignin, hemicellulose, xylose, potassium, nitrogen, phosphorus and other substances contained in black liquor have high utilization va...

Claims

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Application Information

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Patent Type & Authority Applications(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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