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Method for catalyzing cellulose hydrolysis by sulfonic acid functionalized ionic liquid composite system

A technology of sulfonic acid functionalization and ionic liquid, which is applied in the field of catalysis to achieve the effect of improving selectivity and good catalytic activity

Inactive Publication Date: 2016-07-27
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The research on the preparation of sugars and furan compounds by catalytic conversion of cellulose is one of the most important applications of cellulosic biomass, and it is also a topic that researchers have devoted themselves to in recent years. As a solid crystalline polymer with a special structure, there are a large number of hydrogen bonds inside the molecule, and the structure is very stable. The yield of furan compounds from its hydrolysis needs to be improved, and the catalyst and catalytic system need to be optimized urgently.

Method used

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  • Method for catalyzing cellulose hydrolysis by sulfonic acid functionalized ionic liquid composite system
  • Method for catalyzing cellulose hydrolysis by sulfonic acid functionalized ionic liquid composite system
  • Method for catalyzing cellulose hydrolysis by sulfonic acid functionalized ionic liquid composite system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Mix 0.5g microcrystalline cellulose (MCC), 2.0g 1-(4-sulfobutyl)-3-methylimidazole bisulfate, 1mL H 2 O, 8mL of methyl isobutyl ketone was added to a 100mL lined glass tube, placed in a stainless steel autoclave, and heated to 150 o After C, electromagnetically stir, react under its own pressure (2.5atm) for 300min, then cool down to room temperature, filter, wash the reacted solution with water and absolute ethanol; collect the water phase to analyze the content of total reducing sugar after the reaction; the collected residue is in 100 Dry at ℃ for 8 hours, calculate the conversion rate of cellulose; collect the aqueous phase, organic phase and ethanol phase respectively, and analyze the content of the products 5-hydroxymethylfurfural (5-HMF), levulinic acid (LA) and furfural (Furfural) Yield.

Embodiment 2

[0016] Mix 0.5g microcrystalline cellulose (MCC), 2.0g 1-(4-sulfobutyl)-3-methylimidazole bisulfate, 1mL0.2mol / LMnCl 2 Aqueous solution, 8mL methyl isobutyl ketone into 100mL lined glass tube, placed in a stainless steel autoclave, to be heated to 150 o After C, electromagnetically stir, react under its own pressure (2.5atm) for 300min, then cool down to room temperature, filter, wash the reacted solution with water and absolute ethanol; collect the water phase to analyze the content of total reducing sugar after the reaction; the collected residue is in 100 Dry at ℃ for 8 hours, calculate the conversion rate of cellulose; collect the aqueous phase, organic phase and ethanol phase respectively, and analyze the yields of the products 5-HMF, LA and Furfural.

Embodiment 3~6

[0018] Other process conditions and experimental steps are with implementation example 2, but add different metal salt solutions (FeCl 3 , FeCl 2 , CoCl 2 , ZnCl 2 ) as co-catalyst, the results are shown in Table 1.

[0019] Table 1 The influence of different kinds of metal chlorides on the hydrolysis of MCC

[0020]

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Abstract

The invention discloses a method for catalyzing cellulose hydrolysis by a sulfonic acid functionalized ionic liquid composite system. The method comprises: taking methyl isobutyl ketone-water as the solvent, adding a transition metal salt water solution and a sulfonic acid functionalized ionic liquid into cellulose to carry out reaction under a temperature of 120DEGC-180DEG C and a pressure of 2atm-3atm for 3-8h; wherein, the transition metal salt is a manganese salt, an iron salt, a ferrous salt, a cobalt salt or a zinc salt; the sulfonic acid functionalized ionic liquid is 1-(4-sulfobutyl)-3-methylimidazolium hydrogen sulfate, and the structural formula is shown as the specification. The sulfonic acid functionalized ionic liquid provided by the invention shows good catalytic activity in catalyzing cellulose hydrolysis, and when a catalytic amount of the transition metal salt (Mn<2+>, Fe<3+>, Fe<2+>, CO<2+>, Zn<2+>) is added into the system, the product selectivity and the cellulose hydrolysis efficiency are improved.

Description

technical field [0001] The invention relates to a method for catalyzing cellulose hydrolysis by a composite catalyst system of a sulfonic acid functionalized ionic liquid and a transition metal salt, belonging to the field of catalysis. Background technique [0002] With the depletion of coal, oil, natural gas and other fossil fuels and the continuous pollution of the environment, people are trying to find new renewable resources to replace the existing energy chemical raw materials. As one of the most important components of biomass, cellulose has a large reserve, is clean and renewable, so it has received extensive attention from researchers. However, as a solid crystalline polymer, cellulose has a large number of hydrogen bonds inside its molecule, and its structure is very stable. In addition, the conversion of cellulose is greatly restricted by mass transfer and heat transfer, and the conversion rate is not high. Obviously, the composition of the product is complex and...

Claims

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Application Information

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IPC IPC(8): C07D307/46C07D307/50C07C59/185C07C51/00B01J31/30B01J31/28B01J31/34B01J31/32B01J31/26
Inventor 丑凌军陶芙蓉宋焕玲杨建赵军赵华华梁宁
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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