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New method for dissolving lignin by ionic liquid containing sulfonic acid anion radicals

A sulfonic acid anion, ionic liquid technology, applied in the field of agricultural and forestry biomass resource utilization and treatment, can solve the problems of difficult disposal of waste liquid, high requirements for experimental containers, harsh conditions, etc.

Active Publication Date: 2016-12-07
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems existing in the existing lignin dissolution and extraction, and to provide a method to realize the effective dissolution of lignin under mild experimental conditions, so as to solve the problem of strong alkali, harsh conditions, and experimental problems in the traditional lignin dissolution process. High requirements for containers and difficult disposal of waste liquid

Method used

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  • New method for dissolving lignin by ionic liquid containing sulfonic acid anion radicals
  • New method for dissolving lignin by ionic liquid containing sulfonic acid anion radicals
  • New method for dissolving lignin by ionic liquid containing sulfonic acid anion radicals

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Experimental program
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Effect test

Embodiment 1

[0033] Alkali lignin at 100℃ in ionic liquid [Ch][Me 2 NC 4 SO 3 ] Dissolution in

[0034] a), alkali lignin dissolved in ionic liquid: accurately weigh 1g of ionic liquid [Ch][Me] containing sulfonic acid anion group 2 NC 4 SO 3 ] in a 5ml sample bottle, heated to 100°C, then added 5mg of alkali lignin to the ionic liquid, and stirred at a speed of 300rpm until the alkali lignin was completely dissolved, and whether the dissolution was complete was observed with an optical microscope. After the alkali lignin is completely dissolved, add 5 mg of alkali lignin again until the maximum solubility is reached. Finally, at 100℃, alkali lignin in ionic liquid [Ch][Me 2 NC 4 SO 3 ] The maximum solubility in 265mg / g.

[0035] b), recycling of ionic liquids: [Ch][Me] containing alkali lignin 2 NC 4 SO 3 ] Add 3ml absolute ethanol in the ionic liquid, a large amount of alkali lignin solid particles are separated out, and alkali lignin-ionic liquid [Ch][Me 2 NC 4 SO 3 ]- Th...

Embodiment 2

[0037] Alkali lignin at 100℃ in ionic liquid [Et 4 N][Me 2 NC 4 SO 3 ] Dissolution in

[0038] a), alkali lignin dissolved in ionic liquid: accurately weigh 1g ionic liquid containing sulfonic acid anion group [Et 4 N][Me 2 NC 4 SO 3 ] in a 5ml sample bottle, heated to 100°C, then added 5mg of alkali lignin to the ionic liquid, and stirred at a speed of 300rpm until the alkali lignin was completely dissolved, and whether the dissolution was complete was observed with an optical microscope. After the alkali lignin is completely dissolved, add 5 mg of alkali lignin again until the maximum solubility is reached. Finally, at 100°C, alkali lignin in ionic liquid [Et 4 N][Me 2 NC 4 SO 3 ] The maximum solubility in 385mg / g.

[0039] b), recycling of ionic liquids: [Et 4 N][Me 2 NC 4 SO 3 ] Add 3ml absolute ethanol in ionic liquid, a large amount of alkali lignin solid particles are separated out, alkali lignin-ionic liquid [Et 4 N][Me 2 NC 4 SO 3 ]- The turbid sol...

Embodiment 3

[0041] Alkali lignin at 100℃ in ionic liquid [Et 4 N][i-PrNHC 3 SO 3 ] Dissolution in

[0042] a), alkali lignin is dissolved in the ionic liquid: accurately weigh 1g of the ionic liquid containing the sulfonic acid anion group [Et 4 N][i-PrNHC 3 SO 3 ] in a 5ml sample bottle, heated to 100°C, then added 5 mg of alkali lignin to the ionic liquid, stirred at a speed of 300 rpm until the alkali lignin was completely dissolved, and then added 5 mg of alkali lignin after the alkali lignin was completely dissolved, until the maximum solubility is reached. Finally, at 100°C, alkali lignin in ionic liquid [Et 4 N][i-PrNHC 3 SO 3 ] The maximum solubility in 345mg / g.

[0043] b), recycling of ionic liquids: [Et 4 N][i-PrNHC 3 SO 3 ] Add 3ml absolute ethanol in ionic liquid, a large amount of alkali lignin solid particles are separated out, alkali lignin-ionic liquid [Et 4 N][i-PrNHC 3 SO 3 ]- The turbid solution of ethanol is transferred to a centrifuge, and centrifuged ...

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Abstract

The invention provides a new method for dissolving lignin by ionic liquid containing sulfonic acid anion radicals. The new method comprises the following steps of dissolving lignin in biomass raw materials and lignin being subjected to other industrial treatments in the ionic liquid containing the sulfonic acid anion radicals, performing refining and recycling the ionic liquid. Compared with systems of conventional organic solvents and the like, the method has the advantages that the lignin is safe and non-toxic, requirements for experimental equipment are low, the lignin is quickly and effectively dissolved, and the ionic liquid can be recycled.

Description

technical field [0001] The invention relates to the technical field of utilization and treatment of agricultural and forestry biomass resources, and in particular provides a new method for dissolving lignin by an ionic liquid containing sulfonic acid anion groups. Background technique [0002] With the shortage and price rise of non-renewable resources such as petroleum and coal, and people's concern about environmental pollution, the research on the conversion and utilization of natural polymer materials has been highly valued. Lignin, also known as lignin, is a complex polymer compound widely present in the xylem of most terrestrial plants, accounting for about 1 / 3 of the biomass of terrestrial plants, and the total amount is second only to cellulose. Lignin is the only non-petroleum resource in nature that can provide renewable aryl compounds. However, due to the inertness of the macromolecular structure of lignin, only a small amount of lignin can be effectively utilize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/09C08L97/00
Inventor 张宗超颜佩芳
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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