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Lignocellulose pretreatment method and application thereof in a fluid shear-driven urea/alkali system

A lignocellulose and fluid shearing technology, which is applied in the fields of biomass resource utilization and agricultural waste comprehensive utilization, can solve the problems of solution instability, little industrial significance, and insufficient solvency, so as to increase porosity and enhance Effect of Enzymatic Hydrolysis Efficiency and Chemical Catalytic Conversion Efficiency

Active Publication Date: 2021-03-16
CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At a cooling temperature close to freezing point, cellulose is soluble in a medium concentration (8-10%wt%) NaOH solution, but only cellulose with a small degree of polymerization can be dissolved, and the solution is unstable at room temperature and has insufficient solubility , so that NaOH is of little industrial significance as a solvent

Method used

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  • Lignocellulose pretreatment method and application thereof in a fluid shear-driven urea/alkali system
  • Lignocellulose pretreatment method and application thereof in a fluid shear-driven urea/alkali system
  • Lignocellulose pretreatment method and application thereof in a fluid shear-driven urea/alkali system

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Experimental program
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Effect test

Embodiment 1

[0034]12wt% urea / 7wt% sodium hydroxide aqueous solution was pre-cooled to -12°C. Pass the beech wood powder through a 60-mesh sieve, put it in an oven at 50°C and dry it for 24 hours to constant weight. After dry milling for 15 minutes, take 20g of wood powder and add it to the pre-cooled urea / alkali aqueous solution to prepare a mixed solution, the solid-to-liquid ratio is 1:10, and after stirring, put it into a high-speed homogenizer (Jieshi 100-Y) for fluidization Shearing (rotating speed is 49000r / min) for 20min. Freeze the mixture at -20°C for 12 hours, then continue to shear for 10 minutes, accumulatively shearing for 30 minutes. Solid-liquid separation is performed on the pretreated mixed liquid, and the collected solid residue is washed with water until neutral, which is the lignocellulose pretreated product S1 and the supernatant liquid L1. Add conc . The determination of cellulose, hemicellulose, lignin and soluble sugar in biomass is based on the standard determ...

Embodiment 2

[0039] Beech wood flour is passed through a 60-mesh sieve, put into an oven at 50°C for 24 hours to constant weight, and after 15 minutes of dry grinding, take 20g of wood flour and 12wt% urea / 7wt% sodium hydroxide aqueous solution to prepare a mixed solution, the solid-to-liquid ratio The ratio is 1:10, pre-cooled to -12°C after stirring, and placed in a high-speed homogenizer (Jieshi 100-Y) for fluid shearing (49000r / min) for 10min. Freeze the mixture at -20°C for 12 hours, then continue to shear for 20 minutes, accumulatively shearing for 30 minutes. Solid-liquid separation is performed on the pretreated mixed liquid, and the collected solid residue is washed with water until neutral, which is the lignocellulose pretreated product S1 and the supernatant liquid L1. Add conc . The content of L2 carbohydrates in the supernatant was detected by high performance liquid chromatography. The temperature of the whole pretreatment process does not exceed 60°C.

[0040] The result...

Embodiment 3

[0044] Beech wood flour is passed through a 60-mesh sieve, put into an oven at 50°C for 24 hours to constant weight, and after 15 minutes of dry grinding, take 20g of wood flour and 12wt% urea / 7wt% sodium hydroxide aqueous solution to prepare a mixed solution, the solid-to-liquid ratio The ratio is 1:10, pre-cooled to -12°C after stirring, and placed in a high-speed homogenizer (Jieshi 100-Y) for fluid shearing (49000r / min) for 30min. Solid-liquid separation is performed on the pretreated mixed liquid, and the collected solid residue is washed with water until neutral, which is the lignocellulose pretreated product S1 and the supernatant liquid L1. Add conc . The content of L2 carbohydrates in the supernatant was detected by high performance liquid chromatography. The temperature of the whole pretreatment process does not exceed 60°C.

[0045] The results show that the pretreated material S2 contains the following components (calculated by mass fraction): dextran (8.7%), xy...

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Abstract

The invention belongs to the technical field of biomass resource utilization and agricultural waste comprehensive utilization, and particularly relates to a pretreatment method for lignocellulose in aurea / alkali system driven by fluid shearing and application thereof. The invention aims to provide a lignocellulose pretreatment method. The method comprises the following steps: mixing crushed woodpowder with a urea / alkali water solution, carrying out fluid shearing, carrying out solid-liquid separation on the mixed solution, and washing solid residues with water until the solid residues are neutral so as to obtain a pretreated product S1; and adjusting the pH value of supernatant to 3.2 or below with hydrochloric acid, carrying out solid-liquid separation, and washing solid residues with water until the solid residues are neutral so as to obtain a pretreated product S2. The method is short in treatment period and high in treatment capacity and efficiency, lignin can be removed to the maximum extent, high-purity lignin is obtained, the intrinsic structure of the high-purity lignin is kept, meanwhile, a crystalline region of cellulose is damaged, and the porosity is increased. According to the invention, the conversion rate of converting lignocellulose into reducing sugar and the enzymolysis efficiency of carbohydrates can be obviously improved under mild conditions, and meanwhile, the dosages of chemical reagents are reduced.

Description

technical field [0001] The invention belongs to the technical field of utilization of biomass resources and comprehensive utilization of agricultural waste, and in particular relates to a lignocellulose pretreatment method in a fluid shear-driven urea / alkali system and its application. Background technique [0002] In today's society, petrochemical energy sources such as coal, oil, and natural gas are gradually exhausted, and environmental problems caused by greenhouse gases are becoming more and more serious. The development and utilization of renewable energy has become an inevitable trend and research focus. Therefore, as a renewable energy source, the development and utilization of biomass energy has very important practical significance. Lignocellulosic biomass is the most abundant organic renewable resource on earth, mainly derived from agricultural and forestry residues, rich in cellulose, hemicellulose and lignin. The use of lignocellulosic biomass resources to prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12P19/14C12P19/02C13K1/02
CPCC12P19/02C12P19/14C12P2201/00C13K1/02
Inventor 王洪亮朱万斌黎晶雪李雪
Owner CHINA AGRI UNIV
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