Method for extracting lignin from black liquor

A technology of lignin and black liquor, which is applied in the regeneration of pulping liquid, textiles and papermaking, papermaking, etc., can solve the problems of low purity of lignin products, large amount of acid waste water, high environmental protection treatment cost, and achieve extraction adaptability. Strong, reduce acid consumption, reduce the effect of acid wastewater discharge

Active Publication Date: 2017-05-24
CHINA LIGHT IND NANNING DESIGN ENG
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Problems solved by technology

[0011] The advantages of the acid analysis method are low investment and simple operation, but the disadvantages are the large amount of acid wastewater, high cost of environmental protection treatment, low purity of lignin products, and can only be used as a low-end application

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  • Method for extracting lignin from black liquor
  • Method for extracting lignin from black liquor
  • Method for extracting lignin from black liquor

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Embodiment Construction

[0042] The present invention is further described in detail in conjunction with the embodiments of the present invention.

[0043] see Figure 1-4 Shown, a kind of method for extracting lignin in black liquor, described method comprises the following steps:

[0044] (1) Purify the flue gas of the kiln, pass the flue gas of the kiln through the three-stage furnace gas purification tower to remove dust and impurities, and after purification, the clean CO 2 The gas is respectively pressed into the inner bottom of the carbonization tanks at all levels in the carbonization tank group through the pipeline, and the clean CO 2 The gas emerges from the bottom of the carbonization tank;

[0045] (2) Black liquor pretreatment, the mixed black liquor sent from the pulping workshop is continuously sent to the carbonization tank group, and the mixed black liquor overflows step by step in the carbonization tank group from the first level to the higher level, and the carbonization tank Uni...

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Abstract

The invention discloses a method for extracting lignin from black liquor. The method disclosed by the invention has the characteristics that the method involves a raw material black liquor pretreatment system, a flue gas purification system, an inorganic membrane concentration and filtration system and an acid extraction system, and also involves a device which has the functions of energy-saving drying and automatic packaging and adopts flue gas of a clean boiler or a lime kiln for pre-treating the black liquor, so that a pH (Potential of Hydrogen) value of the black liquid is reduced; the pretreated black liquor is concentrated and filtered by an inorganic membrane, so that the yield and the purity of the lignin are increased, and the method is more energy-saving than a traditional technology; filter pressing is carried out on concentrated and separated lignin liquor, so that the dryness is increased to 60 percent; sulfuric acid is added for carrying out acid extraction on the lignin, acid wastewater generated after washing a lignin product is reused by the black liquor pretreatment system, no wastewater is drained, the acid consumption is reduced furthest, and the like.

Description

technical field [0001] The invention relates to the field of lignin extraction from black liquor, in particular to a method for extracting lignin from black liquor. Background technique [0002] Lignin (1ignin) is a natural polyhydroxy aromatic compound that exists in large quantities in wood and grass plants. It is the main component of plants along with cellulose and hemicellulose. As the second largest renewable resource, lignin is second only to cellulose in terms of production on earth. The production of biomass energy, organic chemical raw materials and modification of lignin through dissolution and cracking process using lignin as raw material is a research and development hotspot in recent years. Lignin is the only non-petroleum resource that can provide a large amount of renewable aromatic compounds in nature. Using it to prepare high value-added chemicals is the key to improving the utilization efficiency of biomass resources. The high value-added products develo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/00
CPCD21C11/0007
Inventor 周爱民莫有光苏华李星龙韦新科
Owner CHINA LIGHT IND NANNING DESIGN ENG
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