Method for separating lignin from brown windsor saponin pulp

A technology for lignin and saponin, which is applied in the field of lignin separation from turmeric saponin pulp, can solve problems such as separation and recovery of lignin, and achieve the effects of simple operation and simple process.

Inactive Publication Date: 2009-10-14
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, methods for separating lignin from pulping black liquor in papermaking industry have been reported, such as Chinese patent CN9

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weighing turmeric saponin slurry 50Kg (from applying for a patent on the same day as the present invention, the name of the invention is the production technique of extracting saponin from turmeric with the catalytic solvent method, the following examples are the same), its solid content is 16%, and it uses 40% concentration The lye adjusts the pH value of the turmeric saponin pulp to 11, after which, the upper layer black liquor containing lignin is separated from the turmeric saponin by means of centrifugation, and 40Kg of black liquor is separated to obtain 40Kg of black liquor, which is put into the reaction vessel and then added with a concentration of 98% H 2 SO 4 , adjust the pH value of the black liquor in the reaction vessel to 4, stir and react for 1h, after the lignin in the black liquor is precipitated, obtain 6Kg of lignin product by natural filtration, and the dryness is 25%. The one-time extraction rate of lignin is 94%, and saponin pulp with a purity of...

Embodiment 2

[0022] Weigh 50Kg of turmeric saponin slurry, its solid content is 12%, adjust the pH value of turmeric saponin slurry to 12 with the lye of concentration 40%, afterwards the upper layer black liquor that contains lignin will be separated from turmeric saponin by means of centrifugation, separate Obtain 40Kg black liquor, enter in the reaction vessel, then add the H that concentration is 95% wherein 2 SO 4 , adjust the pH value of the black liquor in the reaction vessel to 3, stir and react for 1.5h, after the lignin in the black liquor is precipitated, by natural filtration, 5.1Kg of lignin product is obtained, and the dryness is 30%. The one-time extraction rate of lignin is 92%, and saponin pulp with a purity of 91% is obtained.

Embodiment 3

[0024] Weigh 50Kg of turmeric saponin slurry, its solid content is 14%, adjust the pH value of turmeric saponin slurry to 10 with the lye of concentration 40%, afterwards, by the mode of centrifugation, the upper layer black liquor containing lignin is separated from turmeric saponin, Separation obtains 40Kg black liquor and enters in the reaction vessel, then adds the H that concentration is 93% wherein 2 SO 4 , adjust the pH value of the black liquor in the reaction vessel to about 2, stir and react for 1h, after the lignin in the black liquor is precipitated, by natural filtration, 5.3Kg of lignin product is obtained, and the dryness is 27%. The one-time extraction rate of lignin is 95%, and saponin pulp with a higher purity of 92.5% is obtained.

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PUM

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Abstract

The invention discloses a method for separating lignin from brown windsor saponin pulp. The method comprises the steps of: adopting lye to regulate the pH value of the brown windsor saponin pulp to 10-12 and carrying out pre-separation to obtain supernatant black liquor of the lignin; adding an inorganic acid to regulate the pH value to 2-4 to lead the lignin to precipitate; and obtaining lignin product by filtering and separating and simultaneously obtaining the saponin pulp with purity of 90 to 93 percent. The brown windsor saponin pulp comes from an invention which applies for patent right together with the invention and is named as production process for extracting saponin from brown Windsor by adopting a catalytic solvent method, and the brown windsor saponin pulp has solid content of 10 to 20 percent with or without the separation of lignin. The method has the advantages of having high one-time lignin extraction yield which reaches 90 to 95 percent for average; realizing separation and recycle of lignin content in brown windsor so as to lead the lignin to be further utilized; and not only obtaining high economic benefits but also largely reducing discharge amount of contamination generated in producing process of brown windsor saponin so as to obtain better environmental benefits.

Description

technical field [0001] The invention relates to a method for separating substances from natural plants, in particular to a method for separating lignin from turmeric saponin pulp. Background technique [0002] 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. Lignin is always associated with cellulose, and cellulose and hemicellulose are the main components of the plant skeleton. In terms of total amount, the amount of lignin on the earth is second only to cellulose, and it is estimated that 150 billion tons of lignin can be produced by plant growth in the world every year. [0003] As a by-product of industrial production, lignin has become an environmental pollutant due to insufficient utilization, seriously polluting the environment and causing a series of environmental and social problems. The content of lignin in turmeric accounts for about 14% of the total. In the turmer...

Claims

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Application Information

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IPC IPC(8): C07G1/00C08H7/00
Inventor 倪晋仁付东康周国辉吴绍祖吴广安王玉枝刘美
Owner PEKING UNIV
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