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A method and device for extracting lignin from kraft pulping black liquor

A technology of pulping black liquor and kraft method, which is applied in the regeneration of pulping liquid, textiles and papermaking, papermaking, etc., can solve the problems of low yield of high-purity lignin, and achieve the improvement of lignin yield and operation simple effect

Active Publication Date: 2019-08-02
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a method for extracting lignin from kraft pulping black liquor, which solves the problem of low yield of high-purity lignin in existing methods

Method used

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  • A method and device for extracting lignin from kraft pulping black liquor
  • A method and device for extracting lignin from kraft pulping black liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0021] Please refer to figure 1 and figure 2 , a device for extracting lignin from kraft pulping black liquor, comprising: a fiber filter, a thickening tank, a first reaction kettle, a first filter press, a second reaction kettle, a second filter press, an alkali Liquid storage tank, acid storage tank and lignin storage tank, fiber filter, concentration tank, first reaction kettle, first filter press, second reaction kettle, second filter press and lignin storage tank are connected in sequence, The first filter press is connected with the lye storage tank, and the second filter press is connected with the acid storage tank.

[0022] A method for extracting lignin from kraft pulping black liquor, comprising the following steps:

[0023] ①Pretreatment: Use a fiber filter to filter the pulping black liquor with a mass concentration of 14% to recover most of the fibers remaining in the black liquor to the pulping system. Because the solubility of fibers in black liquor itself i...

Embodiment 2

[0030] Please refer to figure 1 and figure 2 , a device for extracting lignin from kraft pulping black liquor, comprising: a fiber filter, a thickening tank, a first reaction kettle, a first filter press, a second reaction kettle, a second filter press, an alkali Liquid storage tank, acid storage tank and lignin storage tank, fiber filter, concentration tank, first reaction kettle, first filter press, second reaction kettle, second filter press and lignin storage tank are connected in sequence, The first filter press is connected with the lye storage tank, and the second filter press is connected with the acid storage tank.

[0031] A method for extracting lignin from kraft pulping black liquor, comprising the following steps:

[0032] ①Pretreatment: Use a fiber filter to filter and recover most of the fibers remaining in the black liquor to the pulping system from the pulping black liquor with a concentration of 16%. Because the solubility of the fiber in the black liquor ...

Embodiment 3

[0039] Please refer to figure 1 and figure 2 , a device for extracting lignin from kraft pulping black liquor, comprising: a fiber filter, a thickening tank, a first reaction kettle, a first filter press, a second reaction kettle, a second filter press, an alkali Liquid storage tank, acid storage tank and lignin storage tank, fiber filter, concentration tank, first reaction kettle, first filter press, second reaction kettle, second filter press and lignin storage tank are connected in sequence, The first filter press is connected with the lye storage tank, and the second filter press is connected with the acid storage tank.

[0040] A method for extracting lignin from kraft pulping black liquor, comprising the following steps:

[0041] ①Pretreatment: Use a fiber filter to filter the pulping black liquor with a mass concentration of 18% and recover most of the fibers remaining in the black liquor to the pulping system. Because the solubility of the fiber in the black liquor ...

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Abstract

The invention discloses a method for extracting lignin from kraft pulping black liquor. The method comprises the following steps: filtering pulping black liquor, and conveying the filtered black liquor into a first reaction vessel; introducing CO2 containing flue gas, and adjusting the pH value of the black liquor in the first reaction vessel to 7 to 8.5; separating a lignin filter cake from an alkali liquor by utilizing the black liquor undergone press filtering treatment of a first press filter, and conveying the lignin filter cake into a second reaction vessel; adding sulfuric acid or a hydrochloric acid solution into the lignin filter cake in the second reaction vessel, carrying out heating to 40 DEG C to 85 DEG C, then carrying out stirring, and adjusting the pH value of the solution to 2 to 3; and separating a mixed solution undergone press filtering acidification of a second press filter so as to prepare a lignin precipitate, then carrying out washing, and subjecting the washed lignin precipitate to press filtering so as to obtain a lignin finished product. Through the method provided by the invention, the lignin extraction yield of the pulping black liquor is improved; meanwhile, the purity of the prepared lignin reaches 92 to 98%.

Description

technical field [0001] The application relates to resource utilization of kraft pulping black liquor, in particular to a method and device for extracting lignin from kraft pulping black liquor. Background technique [0002] Lignin (lignin for short), together with cellulose and hemicellulose, is the main component of the plant skeleton, and is a natural organic polymer synthesized by the secondary metabolism of the plant. Lignin and its derivatives extracted from pulping black liquor are widely used in industries such as agriculture, petrochemical industry, cement and concrete industry, plastics and polymer materials. However, application fields such as adhesives and foam materials have higher requirements on the purity of lignin. [0003] Lignin is the main by-product extracted from the black liquor of kraft pulping process. It has various structures and relative molecular masses, and is extremely heterogeneous. It can be dissolved in various aqueous solutions, but insolub...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/00
Inventor 苏坚训
Owner HAINAN JINHAI PULP & PAPER