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A method for extracting lignin from cellulosic ethanol fermentation residue and co-producing phosphorus and potassium compound fertilizer

A technology of fermentation residue and fiber ethanol, which is applied in fiber raw material treatment, fertilizer mixture, fertilization equipment, etc., to achieve the effect of improving utilization rate, reducing reaction energy consumption, and improving sustainable cycle

Active Publication Date: 2018-10-09
NANJING TECH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Purpose of the invention: The present invention provides a method for extracting lignin from cellulosic ethanol fermentation residues and co-producing phosphorus and potassium compound fertilizers, which solves the acid or high-salt wastewater generated in the traditional lignin production process, and is an economical method. Energy-saving and environment-friendly lignin separation and extraction method

Method used

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  • A method for extracting lignin from cellulosic ethanol fermentation residue and co-producing phosphorus and potassium compound fertilizer
  • A method for extracting lignin from cellulosic ethanol fermentation residue and co-producing phosphorus and potassium compound fertilizer

Examples

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Embodiment 1

[0024] Get 1kg of corn stalk fiber ethanol fermentation residue and put it into an 8L reaction tank, and add 2.16wt.% KOH aqueous solution 5.799L thereinto to adjust the final alkali concentration of the reaction solution (referring to the water and KOH in the corn stalk fiber ethanol fermentation residue The alkali concentration in the mixed solution obtained by mixing the aqueous solution, the same below) is 2wt.%, and the final solid-liquid ratio (referring to the solid-liquid ratio of the absolute dry substance in the corn stalk fiber ethanol fermentation residue and the mixed solution, the same below) is 1kg: 12L, and then extract lignin by alkaline method at 70°C for 3h. After the reaction, the screw press was used to separate the solid and liquid, and the mass ratio of HM straw decomposing and solid phase residue was 0.1g:1kg, and the composting treatment was carried out for 15 days, so as to realize the reuse of biomass in the field, and the filtrate was lignin solutio...

Embodiment 2

[0029] Take 1kg of corn stalk fiber ethanol fermentation residue and put it into an 8L reaction tank, and add 4.753L of 3.30wt.% KOH aqueous solution to it to adjust the final alkali concentration of the reaction solution to 3wt.%, and the final solid-liquid ratio to 1kg:10L , and then lignin was extracted by alkaline method at 80°C for 2.5h. After the reaction, the screw press was used to separate the solid and liquid, and the mass ratio of HM straw decomposing and solid phase residue was 0.1g:1kg, and the composting treatment was carried out for 15 days, so as to realize the reuse of biomass in the field, and the filtrate was lignin solution.

[0030] Slowly add 85wt.% industrial phosphoric acid to the lignin solution to adjust its pH to 4, during which the stirring speed is set to 500rpm. The mixture is then injected into a plate and frame filter device for solid-liquid separation again. The solid phase is washed and dried to obtain lignin solid powder; the liquid phase i...

Embodiment 3

[0033] Take 1kg of corn stalk fiber ethanol fermentation residue and put it into an 8L reaction tank, and add 4.230L of 4.45wt.% KOH aqueous solution to it to adjust the final alkali concentration of the reaction solution to 4wt.%, and the final solid-liquid ratio to 1kg:9L , and then lignin was extracted by alkaline method at 90° C. for 1 h. After the reaction, use a screw press for solid-liquid separation, and mix and compost the HM straw for 15 days at a mass ratio of 0.1 g: 1 kg to solid phase residue, so as to realize the reuse of biomass in the field. The liquid is lignin solution.

[0034] Slowly add 85wt.% industrial phosphoric acid to the lignin solution to adjust its pH to 4, during which the stirring speed is set to 500rpm. The mixture is then injected into a plate and frame filter device for solid-liquid separation again. The solid phase is washed and dried to obtain lignin solid powder; the liquid phase is spray-dried, and the final product can be used as a high...

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Abstract

The invention discloses a method for extracting lignin from a fibrous ethanol fermentation residue as a raw material and coproducing a phosphorus-potassium compound fertilizer. The method comprises the following steps: (1) adding a potassium-containing alkaline aqueous solution into the fermentation residue for extracting the lignin, and performing solid-liquid separation to obtain a solid residueand an alkali extract; (2) adding a decomposing agent into the obtained solid residue for decomposing treatment; (3) adjusting the pH of the alkali extract to 2-6 by using a phosphorus-containing alkaline aqueous solution, performing solid-liquid separation, and washing and drying a solid phase to obtain the lignin; (4) drying a filtrate to obtain the phosphorus-potassium compound fertilizer. Through gradient adjustment of the pH of the alkali extract, the fertilizer efficiency of the slow-release phosphorus-potassium compound fertilizer is controlled so as to meet needs of different crops onthe phosphorus-potassium compound fertilizer.

Description

technical field [0001] The invention belongs to the field of biological energy and biochemical industry, and specifically relates to a method for extracting lignin and co-producing phosphorus and potassium compound fertilizer by using cellulosic ethanol fermentation residue as a raw material. Background technique [0002] In recent years, with the gradual depletion of fossil resources such as petroleum and the increasingly prominent problems of environmental pollution, the concept of green and low-carbon development has been deeply rooted in the hearts of the people. The refining technology using all components of biomass has become a research and development field that has attracted much attention in the world. , in which fuel ethanol, as a renewable biomass energy, is gradually permeating people's daily life. [0003] In 2015, the global fuel ethanol production reached 98.3 billion liters, accounting for 75% of the total bio-liquid fuel (including ethanol, biodiesel and hy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C5/00D21D5/18C05G1/00
Inventor 应汉杰陈彦君朱晨杰唐成伦单军强陈勇吴菁岚柳东
Owner NANJING TECH UNIV
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