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Device and method for separating lignin from papermaking black liquor in grading manner

A papermaking black liquor, fractionation and separation technology, applied in the field of pulp and papermaking, can solve the problem of industrial lignin being only 10%, waste of resources, etc., and achieve the effect of simple operation and low energy consumption

Inactive Publication Date: 2015-11-18
HAINAN JINHAI PULP & PAPER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, only a small part of the industrial lignin produced in the process of pulping and papermaking can be effectively utilized, such as making lignin adsorbents, soil conditioners, crop fertilizers, surface modifiers, polyurethane foams, adhesives, etc. There are good applications and developments in various fields, but most of the rest are directly discharged into rivers along with papermaking wastewater, which is a great waste of resources, or industrial lignin is directly burned as fuel to provide heat and recovery alkali
According to the survey, due to the limitations of technology and capacity, the utilization rate of industrial lignin in my country is still only 10%.

Method used

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  • Device and method for separating lignin from papermaking black liquor in grading manner
  • Device and method for separating lignin from papermaking black liquor in grading manner
  • Device and method for separating lignin from papermaking black liquor in grading manner

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A device for fractionating lignin in papermaking black liquor, comprising a black liquor storage tank 1, a first transfer pump 2, a pretreatment device 3, a first membrane filter 4, a second membrane filter 5, and a third membrane filter 6 , polymer lignin storage tank 7, membrane filtrate storage tank 8, the second transfer pump 9, the fourth membrane filter 10, the fifth membrane filter 11, the sixth membrane filter 12, connecting pipe 13 and low molecular lignin Plain storage tank 14; The first membrane filter 4 is provided with the first filter membrane 41, the first filtrate inlet 42, the first filtrate outlet 43 and the first concentrate outlet 44; The second membrane filter 5 is provided with The second filter membrane 51, the second filtrate inlet 52, the second filtrate outlet 53 and the second concentrate outlet 54; the third membrane filter 6 is provided with the third filter membrane 61, the third filtrate inlet 62, the third filtrate Outlet 63 and the third...

Embodiment 2

[0042] Based on the apparatus for fractionating and separating lignin in papermaking black liquor in Example 1, further, the connecting pipe 13 is provided with a water hole 131 .

[0043] In the specific operation, during the first membrane filtration process, water is added from the water hole of the connecting pipe to wash the inorganic matter in the mixture I, so as to ensure the quality of lignin in the concentrated solution.

Embodiment 3

[0045] Based on the lignin fractionation and separation device in the papermaking black liquor of Example 1, in the specific operation, add the black liquor and water at the bottom of the pulping through flash evaporation and fiber recovery machine treatment in the black liquor storage tank 1, and the concentration is 15%. The papermaking black liquor is diluted to 4.5%. The concentration is the mass ratio of the total solids to the papermaking black liquor. The papermaking black liquor is sent to the pretreatment device 3 by the first transfer pump 2 for pretreatment. First, the papermaking black liquor The liquid passes through the heat exchanger 31, heats up to 35°C, and then passes through the bag filter 32 for pretreatment. The main purpose of the pretreatment is to ensure the operating conditions of the membrane. The filter cloth of the bag filter 32 has a filter cloth specification of 7 μm, and the mixture I is obtained. Then the mixture I enters the first membrane filte...

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PUM

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Abstract

The invention discloses a device and a method for separating lignin from papermaking black liquor in a grading manner. The device is characterized by comprising a black liquor storage tank, a first transfer pump, a pretreatment device, a first membrane filter, a second membrane filter, a third membrane filter, a macromolecular lignin storage tank, a membrane filtering medium storage tank, a second transfer pump, a fourth membrane filter, a fifth membrane filter, a six membrane filter, a connecting pipe and a low-molecular-weight lignin storage tank. The method comprises the following steps: pretreatment, primary membrane filtration and secondary membrane filtration. By virtue of the device and method for separating the lignin from the papermaking black liquor in the grading manner, alkali and lignin in the black liquor can be separated, alkali can be returned to a pulping system so as to be subjected to liquor circulation, lignin different in molecular weight grades can be separated out so as to serve as different byproducts for sale or serve as intermediate products for reprocessing, and the method is simple in operation and low in water consumption and energy consumption and has a favorable prospect.

Description

technical field [0001] The invention relates to the field of pulp and papermaking, in particular to a device for fractionating and separating lignin in papermaking black liquor and a method thereof. Background technique [0002] As one of the main components of plant fiber raw materials, lignin mainly exists in woody tissue, accounting for 25% in woody plants, and is the most abundant organic matter in the world, second only to cellulose. Lignin, a phenolic polymer compound with a three-dimensional three-dimensional network structure, is composed of highly substituted phenylpropane structural units randomly polymerized, and together with hemicellulose and cellulose, it constitutes the main component of the plant skeleton. [0003] At present, only a small part of the industrial lignin produced in the process of pulping and papermaking can be effectively utilized, such as making lignin adsorbents, soil conditioners, crop fertilizers, surface modifiers, polyurethane foams, adh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C11/04C08H7/00
CPCD21C11/04
Inventor 谢勤
Owner HAINAN JINHAI PULP & PAPER