Process for extracting lignin by acid separation

A technology of acid analysis lignin and extraction process, which is applied in the field of acid analysis lignin extraction process, can solve problems such as difficulties, lack of detail and specificity, and unexplained static removal efficiency of fiber sludge, etc., to achieve large processing capacity and one-time investment small effect

Inactive Publication Date: 2005-03-02
SHANDONG TRALIN PAPER
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Problems solved by technology

[0019] The content disclosed in the above patent does not explain the efficiency of static removal of fiber sludge, the specific impact of acidification and deterioration caused by static overtime, the amount of sulfuric acid, the final pH value, and the specific data that the lignin extraction rate reaches 90%, which is more important What's more, on the technical problem of lignin extraction, every step of progress, even a small technical progress, is considered extremely difficult. Although the above-mentioned patents involve some technical contents of lignin extraction, these contents It is not detailed enough. For those skilled in the art, reproducing the technical solutions and technical effects described in this invention will have an important impact

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  • Process for extracting lignin by acid separation
  • Process for extracting lignin by acid separation

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Effect test

Embodiment 1

[0048] Put 500 cubic meters of black liquor in the pool for 10 hours to allow the fiber mud and sediment to settle, and the upper layer of black liquor enters the two-stage series cooling tower to cool down, so that the temperature of the black liquor drops to 35°C; the cooled black liquor enters the Collect in the storage tank, get 50 square meters of black liquor as solvent, add molecular weight to it and be 15 million polyacrylamide (Gongyi City Lanxing Water Purification Material Factory, APAM, white granule) 50kg, when adding, in the vertical direction of black liquor inlet Add the black liquor evenly from the top, mix evenly in the special dissolution tank, pour it into the folded plate reaction tank through the metering pump, merge with another part of the black liquor, and after uniform mixing, enter the secondary main tank with a four-stage stepped drop mixing system Reaction tank; at the same time as adding, add H with a concentration of 93% to the secondary main reac...

Embodiment 2

[0050] Put 1,000 cubic meters of black liquor in the pool for 8 hours to allow the fiber mud and sediment to settle, and the upper layer of black liquor enters the two-stage series cooling tower to cool down, so that the temperature of the black liquor drops to 30°C; the cooled black liquor enters the Collect in the storage tank, get 200 square meters of black liquor as solvent, add molecular weight to it to be 10 million polyacrylamide (Gongyi City Lanxing Water Purification Material Factory, APAM, white granule) 120kg, when adding, in the vertical direction of black liquor inlet Add the black liquor evenly from the top, mix evenly in the special dissolution tank, pour it into the folded plate reaction tank through the metering pump, merge with another part of the black liquor, and after uniform mixing, enter the secondary main tank with a four-stage stepped drop mixing system Reaction tank; at the same time as adding, add H with a concentration of 95% to the secondary main re...

Embodiment 3

[0054] Put 1,000 cubic meters of black liquor in the pool for 12 hours to allow the fiber mud and sediment to settle, and the upper layer of black liquor enters the two-stage series cooling tower to cool down, so that the temperature of the black liquor drops to 20°C; the cooled black liquor enters the Collect in the storage tank, take 300 square meters of black liquor as a solvent, add 200kg of polyacrylamide (Yixing Angel Synthetic Chemical Co., Ltd.) with a molecular weight of 20 million to it, and add evenly with the black liquor above the vertical direction of the black liquor inlet , mixed evenly in the special dissolution tank, poured into the folded plate reaction tank through the metering pump, merged with another part of the black liquor, after uniform mixing, entered the secondary main reaction tank with a four-level stepped drop mixing system; while adding , adding 100% H to the secondary main reaction tank through a ceramic pump 2 SO 4 ; The inlet and the bottom ...

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Abstract

The present invention relates to the extraction process of acid out lignin, and is especially the process of treating waste digestion liquid produced during making paper pulp to extract lignin. The extraction process includes depositing separation to eliminate fiber mud and silt from black liquor, cooling black liquor containing lignin, adding flocculent and acid to deposit lignin, and filtering to obtain lignin containing product. The said process has high lignin extracting rate up to 95 %, and the obtained lignin has excellent water filtering performance and dryness over 25 %.

Description

Technical field: [0001] The invention relates to an acid analysis lignin extraction process, in particular to a method for extracting lignin from cooking waste liquid produced in papermaking and pulping. Background technique: [0002] In the process of alkaline pulping, the chemical reaction of fiber raw materials and lye after cooking produces organic sodium salt and dissolves in the cooking liquid. Because it is black, it is called black liquor. Inorganic matter in black liquor is mainly compound sodium salt and free NaOH, Na 2 SO 4 、Na 2 S, Na 2 CO 3 And the inorganic ashes brought in by raw materials, most of which are sodium combined with black liquor organic compounds. Organic matter mainly includes lignin and alkaline degradation products of carbohydrates. [0003] Lignin is a class of complex aromatic polymers in plant cells, and it acts as a binder for cellulose to increase the mechanical strength of plants. [0004] Lignin is always associated with cellulose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C02F1/52C07G1/00C08H7/00
Inventor 李洪法郭良进杨吉慧宋明信贾明昊
Owner SHANDONG TRALIN PAPER
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