Esterifiable modification method of lignocelluloses and esterifiable modified lignocelluloses

A technology for lignocellulose and esterification modification, which is applied in the field of preparation of lignocellulose esterification materials based on imidazolium-based ionic liquids, can solve problems such as restricting commercial applications, and achieve the effects of less impurity content and simple product purification treatment.

Inactive Publication Date: 2012-01-11
BEIJING FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its commercial application is limited because lignocellulose is insoluble in common solvents or the solvents used when dissolving or releasing non-environmentally friendly substances

Method used

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  • Esterifiable modification method of lignocelluloses and esterifiable modified lignocelluloses
  • Esterifiable modification method of lignocelluloses and esterifiable modified lignocelluloses
  • Esterifiable modification method of lignocelluloses and esterifiable modified lignocelluloses

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0060] Embodiment 1: the preparation of ethyl esterified poplar lignocellulose

[0061] 1. Dissolving lignocellulose

[0062] 1) Add poplar wood powder into a ceramic pot with a volume of 2 L and 68 ceramic balls with a diameter of 15 mm, and grind the wood powder at room temperature (25°C) at a speed of 70 rpm for 48 hours to obtain Ball-milled poplar wood flour with particle size ≤50um;

[0063] 2) Put 0.5g of ball-milled poplar wood powder (the molar number of hydroxyl groups is 14.6mmol / g) and 9.5g of 1-butyl-3-methylimidazolium chloride salt in a 50mL three-necked bottle, turn on nitrogen, and carry out nitrogen protection. Put it in an oil bath and heat it with constant stirring, wherein the 1-butyl-3-methylimidazolium chloride salt dissolves into an ionic liquid, control the heating temperature of the oil bath to 110°C, and stir until the wood powder is completely dissolved in the ionic liquid.

[0064] 2. Esterification treatment

[0065] Stop heating, and when the ...

Embodiment 2

[0068] The preparation of embodiment 2 butylated poplar lignocellulose

[0069] 1. Dissolving lignocellulose

[0070] 1) Add poplar wood powder into a ceramic pot with a volume of 2 L and 68 ceramic balls with a diameter of 15 mm, and grind the wood powder at room temperature (25°C) at a speed of 70 rpm for 48 hours to obtain ≤50um ball-milled poplar wood flour;

[0071] 2) Put 0.5g of ball-milled poplar wood powder (the molar number of hydroxyl groups is 14.6mmol / g) and 9.5g of 1-butyl-3-methylimidazole acetate (placed in a 50mL three-necked bottle, connect to nitrogen, and carry out nitrogen protection, put The three-neck flask was heated in an oil bath and stirred continuously, in which 1-butyl-3-methylimidazole acetate was dissolved into an ionic liquid, and the temperature of the oil bath was controlled to be 130°C, and stirred until the wood powder was dissolved in the ionic liquid middle.

[0072] 2. Esterification treatment

[0073] Stop heating, and when the tempe...

Embodiment 3

[0079] The preparation of embodiment 3 butylated poplar lignocellulose

[0080] Except that the esterification reagent butyryl chloride used in the esterification treatment step was 7.3 mmol, the rest was the same as in Example 2. The mass increase percentage of the prepared butylated poplar lignocellulose is 11.9%, and the hydroxyl substitution degree is 1.7mmol / g.

[0081] Scanning electron microscopy was used to detect the morphology of esterified modified lignocellulose, such as Figure 5 Shown in B4a, B4b, B4c in.

[0082] Figure 5 Middle (B4a) is a scanning electron micrograph of esterified modified lignocellulose magnified 1000 times; Figure 5 Middle (B4b) is a scanning electron micrograph of esterified modified lignocellulose magnified 5000 times; Figure 5 Middle (B4c) is a scanning electron micrograph of esterified modified lignocellulose magnified 10,000 times.

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Abstract

The invention discloses an esterifiable modification method of lignocelluloses and esterifiable modified lignocelluloses. The esterifiable modification method comprises the following steps: dissolving lignocelluloses in an ionic liquid; and carrying out esterification reaction on the lignocelluloses and an esterifying agent. The method disclosed by the invention has the characteristics that the prices of the used raw materials are low, the technologic process is simple, the reaction process has no pollution, a reaction system can be reused, the hydroxyl substitution degree of a prepared lignocellulose esterification material can be controlled, and the like; and the method is one of important methods for industrial transformation and utilization of renewable lignocellulose resources.

Description

technical field [0001] The invention relates to the technical fields of preparation of biomass degradable materials and green and renewable resources, and specifically refers to a preparation method of lignocellulose esterification materials based on imidazole-based ionic liquids. technical background [0002] With the increasing shortage of petroleum resources and the emergence of a series of problems such as environmental pollution caused by the development of corresponding petrochemical products, people have turned their attention to the research and development of other alternative resources. Among them, coal, natural gas and biomass attract people's attention the most. The biomass resource represented by lignocellulose has become a research hotspot due to its unique renewability and carbon dioxide neutrality. Biomass will become the only source of organic carbon compounds in the entire synthetic material industry. [0003] my country's biomass production exceeds 2.1 bi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08H8/00C08J3/09C08L97/02
Inventor 袁同琦孙少妮许凤孙润仓
Owner BEIJING FORESTRY UNIVERSITY
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