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A method for total separation of components of papermaking black liquor

A technology for papermaking black liquor and a separation method, which is applied in the field of papermaking black liquor, can solve the problem of limiting the quality of lignin to improve the popularization and use of lignin, does not solve the problem of comprehensive utilization of inorganic substances in black liquor, and has not found comprehensive utilization of hemicellulose, etc. problems, to achieve the effect of saving cooling equipment investment, saving equipment investment, and simplifying the pretreatment process

Active Publication Date: 2019-01-08
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane separation method is a purely physical method and is environmentally friendly, but the lignin purity of membrane separation method is not high. For example, lignin products contain inorganic salts, sodium ions tightly bound to lignin and other reducing organic substances. Limit the improvement of lignin quality and the further popularization and use of lignin
And among the black liquor treatment methods commonly used at present, some methods have the problems of high energy consumption and low comprehensive utilization efficiency, some methods have the problems of being unfriendly to the environment and the product grade is not high, and most of the methods only solve the problem of lignin extraction. The problem is that no comprehensive utilization method has been found for hemicellulose, and the comprehensive utilization of inorganic substances in black liquor has not been solved.

Method used

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  • A method for total separation of components of papermaking black liquor

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Such as figure 1 Shown:

[0035] S1. Pretreatment: transport the papermaking black liquor with a temperature of 83°C and a solid content of 16.1% to the bag filter with a pump, and the outlet pressure of the pump is 0.23MPa to remove coarse particles and hard objects in the black liquor;

[0036] S2. Inorganic membrane filtration: Then use a high-pressure pump to transport to a section of inorganic membrane filtration device. The inorganic membrane is a ceramic tubular membrane. The membrane support material of the inorganic membrane is alumina, and the membrane layer is a composite zirconium membrane. The inorganic membrane The molecular weight cut-off of the membrane filtration device is more than 3000, and the outlet pressure of the high-pressure pump is 1.0 MPa to obtain a filtrate and a concentrated solution with a solid content of 22.1%.

[0037] S3, separation of lignin:

[0038] S3-1. Weak acid acid analysis and filtration of the concentrated solution: add liq...

Embodiment 2

[0046] Such as figure 1 Shown:

[0047] S1. Pretreatment: transport the papermaking black liquor with a temperature of 79°C and a solid content of 16.5% to the bag filter with a pump, and the outlet pressure of the pump is 0.26MPa to remove coarse particles and hard objects in the black liquor;

[0048] S2. Inorganic membrane filtration: Then use a high-pressure pump to transport to a section of inorganic membrane filtration device. The inorganic membrane is a ceramic tubular membrane. The membrane support material of the inorganic membrane is alumina, and the membrane layer is a composite zirconium membrane. The inorganic membrane The molecular weight that the membrane filtration device can cut off is more than 3000, and the outlet pressure of the high pressure pump is 2.0Mpa, and the filtrate and the concentrated solution with a solid content of 22.6% are obtained.

[0049] S3, separation of lignin:

[0050] S3-1. Weak acid acid analysis and filtration of the concentrated ...

Embodiment 3

[0058] Such as figure 1 Shown:

[0059] S1. Pretreatment: transport the papermaking black liquor with a temperature of 82°C and a solid content of 16.2% to the bag filter with a pump, and the outlet pressure of the pump is 0.25MPa to remove coarse particles and hard objects in the black liquor;

[0060] S2. Inorganic membrane filtration: Then use a high-pressure pump to transport to a section of inorganic membrane filtration device. The inorganic membrane is a ceramic tubular membrane. The membrane support material of the inorganic membrane is alumina, and the membrane layer is a composite zirconium membrane. The inorganic membrane The molecular weight cut-off of the membrane filtration device is more than 3000, and the outlet pressure of the high-pressure pump is 1.2MPa to obtain a filtrate and a concentrated solution with a solid content of 23.3%.

[0061] S3, separation of lignin:

[0062] S3-1. Weak acid acid analysis and filtration of the concentrated solution: add liqu...

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Abstract

The invention discloses a full separating method of a papermaking black liquid component; the method includes steps of applying multi-section filtering method of an inorganic film and an organic film, and combining with acid eduction of weak acid and strong acid, effectively treating the black liquid component, separating and recycling lignin, semi-fiber and inorganic salt matter in the papermaking black liquid, acquiring high-purity lignin product; meanwhile, an additive for multi-purpose of the papermaking industry can be acquired; pulping cooking soup capable of circulation is acquired. The technique and handling method belong to a green technique, and method is simple in operation, high in efficiency, and convenient to realize large-scale popularization and application.

Description

technical field [0001] The invention relates to the technical field of papermaking black liquor, in particular to a method for completely separating components of papermaking black liquor. Background technique [0002] At present, some work has been carried out on the utilization of lignin in black liquor at home and abroad, and some achievements have been made, but the research on the comprehensive utilization of various components in black liquor has just started, and the results are very few. At present, the extraction techniques of alkali lignin mainly include acid analysis method, membrane separation method, flocculation precipitation method, electrochemical method and so on. Acid analysis and membrane separation are the common methods for separating lignin from black liquor. Sulfuric acid is generally used in the acid analysis method, which is a chemical extraction method, which will produce more waste water and foul-smelling waste gas such as hydrogen sulfide gas, wh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/04
CPCD21C11/04
Inventor 陈龙平谢勤苏坚训
Owner HAINAN JINHAI PULP & PAPER
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