Preparation method for co-producing bleached paper pulp, lignin carbon fibers and fuel ethanol

A technology of lignin carbon and fuel ethanol, which is applied in the co-production of bleached pulp, fuel ethanol, and lignin carbon fiber, can solve the problem of increased difficulty in wastewater treatment, affecting the degradation of cellulose and hemicellulose, cellulase and Cellulase degrades carbohydrates and other problems to achieve good penetration and diffusion performance, reduce the generation of pollutants, and reduce mechanical energy consumption.

Inactive Publication Date: 2011-05-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because macromolecules such as cellulose, hemicellulose, and lignin are linked by hydrogen bonds or covalent bonds to form complex and dense structural systems, the intra-chain and inter-chain links of cellulose and hemicellulose are mainly linked by hydrogen bonds, while In addition to strong hydrogen bonds, lignin also forms a stable lignin-carbohydrate complex with hemicellulose through covalent bonds; cellulose, hemicellulose and lignin interweave to form a complex, difficult-to-degrade The cell wall structure determines that the degradation of any type of component must be restricted by other components, resulting in low conversion utilization of untreated lignocellulose; lignin hinders the degradation of carbohydrates by cellulase and hemicellulase, It affects the degradation of cellulose and hemicellulose, thereby reducing the fermentation yield of ethanol. Lignin must be decomposed through proper pretreatment to improve the conversion efficiency of cellulose and hemicellulose, but it will increase production costs, especially The difficulty of wastewater treatment is increasing; especially the high crystallinity of cellulose fibers requires an acidic environment and a temperature of 190°C to effectively hydrolyze, which increases the cost of biomass refining

Method used

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  • Preparation method for co-producing bleached paper pulp, lignin carbon fibers and fuel ethanol
  • Preparation method for co-producing bleached paper pulp, lignin carbon fibers and fuel ethanol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The co-production preparation method of bleached pulp, lignin carbon fiber and fuel ethanol lies in the following steps:

[0027] (1) Hemicellulose extraction

[0028] After the eucalyptus wood is cut into flakes and cleaned to remove sand and gravel, hemicellulose is hydrolyzed at 155°C for 120 minutes. During the hydrolysis process, lye is added to keep the pH value of the hydrolyzate at 7 to prevent acid hydrolysis of cellulose fibers; Filter the hemicellulose-containing hydrolyzate from the sheet-shaped eucalyptus raw material under normal pressure to obtain hemicellulose and lignin hydrolyzate;

[0029] (2) Hemicellulose extrusion extraction

[0030] During the hydrolysis process of the sheet-shaped eucalyptus raw material, the cellulose fiber absorbs water and swells, and part of the hemicellulose and lignin are hydrolyzed but not dissolved. Use a parallel twin-screw extruder to apply ≥ 1Mpa to the sheet-shaped eucalyptus raw material that has filtered out the hy...

Embodiment 2

[0038] The co-production preparation method of bleached pulp, lignin carbon fiber and fuel ethanol lies in the following steps:

[0039] (1) Hemicellulose extraction

[0040]After the eucalyptus is cut into flakes and cleaned to remove sand and gravel, hemicellulose is hydrolyzed at 155°C for 180 minutes. During the hydrolysis process, lye is added to keep the pH value of the hydrolyzate at 9 to prevent acid hydrolysis of cellulose fibers; Filter the hemicellulose-containing hydrolyzate from the sheet-shaped eucalyptus raw material under normal pressure to obtain hemicellulose and lignin hydrolyzate;

[0041] (2) Hemicellulose extrusion extraction

[0042] During the hydrolysis process of the sheet-shaped eucalyptus raw material, the cellulose fiber absorbs water and swells, and part of the hemicellulose and lignin are hydrolyzed but not dissolved. Use a parallel twin-screw extruder to apply ≥ 1Mpa to the sheet-shaped eucalyptus raw material that has filtered out the hydrolyz...

Embodiment 3

[0050] The co-production preparation method of bleached pulp, lignin carbon fiber and fuel ethanol lies in the following steps:

[0051] (1) Hemicellulose extraction

[0052] Poplar raw materials are cut into flakes, cleaned and removed of sand and gravel, then hydrolyzed hemicellulose at 165°C for 150 minutes, adding lye at the right time during the hydrolysis process to keep the pH value of the hydrolyzed solution at 8, so as to prevent acid hydrolysis of cellulose fiber; filtering the hemicellulose-containing hydrolyzate from the flaky poplar raw material under normal pressure by using a sieve to obtain the hemicellulose and lignin hydrolyzate;

[0053] (2) Hemicellulose extrusion extraction

[0054] During the hydrolysis process of flaky poplar raw materials, the cellulose fiber absorbs water and swells, and part of the hemicellulose and lignin are hydrolyzed but not dissolved. A parallel twin-screw extruder is used to apply ≥ 1Mpa to the flaky poplar raw material that ha...

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Abstract

The invention discloses a preparation method for co-producing bleached paper pulp, lignin carbon fibers and fuel ethanol. The method comprises the following steps of: (1) extracting hemicellulose to obtain hemicellulose and lignin hydrolyzate; (2) extruding and extracting the hemicellulose so as to extrude the hemicellulose and lignin hydrolyzate out; (3) bleaching cellulosic fibers to obtain a product, namely the bleached paper pulp; (4) extracting the lignin carbon fibers to obtain the lignin carbon fibers; and (5) separating the hemicellulose out of the hemicellulose and lignin hydrolysate to extract the fuel ethanol. The method has a simple process and improves the product quality on the premise of not increasing the production cost.

Description

technical field [0001] The invention relates to the fields of papermaking technology and new energy technology, in particular to a co-production preparation method of bleached pulp, lignin carbon fiber and fuel ethanol. Background technique [0002] Pulping and papermaking is a heavily polluting industry. Pulping and papermaking mainly use plant cellulose fibers. About 70% of the plant components are cellulose and hemicellulose, and 15-20% of lignin, cellulose and hemicellulose are aggregated. It exists in filamentary bundles, and lignin is filled in it, and combines with various structural proteins and other polysaccharides to form a polymeric structure. During the production process, under the action of high temperature and chemicals, a large amount of lignin and hemicellulose are dissolved to form pollution thing. High-yield pulping process: pretreatment of plant raw materials + mechanical extrusion, kneading or disc grinding to separate fibers into pulp. Pretreatment is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C9/10C12P7/06D01F9/17C08H7/00
CPCY02E50/10
Inventor 陈荣朱小林刘焕彬
Owner SOUTH CHINA UNIV OF TECH
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