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Preparation method and application of a lignin-based hydrothermal carbon sulfonic acid catalyst

A lignin-based, carbon sulfonic acid technology, applied in chemical instruments and methods, physical/chemical process catalysts, applications, etc., can solve problems such as mass reduction, pore collapse, and non-compliance with green environmental protection principles, and achieve easy separation and process. Mild conditions and sustainable results

Active Publication Date: 2018-10-16
HUAQIAO UNIVERSITY
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the currently widely used method of pyrolysis to prepare biochar materials will cause mass loss and pore collapse during the pyrolysis process, and produce many toxic by-product gases, which does not conform to the principle of green environmental protection. Environmentally friendly functionalization of carbonaceous materials is of great significance for high-value utilization of renewable biomass resources and green catalysis

Method used

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  • Preparation method and application of a lignin-based hydrothermal carbon sulfonic acid catalyst
  • Preparation method and application of a lignin-based hydrothermal carbon sulfonic acid catalyst
  • Preparation method and application of a lignin-based hydrothermal carbon sulfonic acid catalyst

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Embodiment 1

[0024] About 100 g of industrial alkali lignin containing ash is subjected to alkali-dissolving acid analysis treatment: the crude alkali lignin is dissolved in 10% aqueous sodium hydroxide solution so that the mass fraction of the lignin solution is not greater than 10%, and the insoluble matter is removed by filtration to obtain Purified alkali lignin solution. Then, at a temperature of 60° C. and a stirring speed of 200 rpm, concentrated sulfuric acid was added to make the solution pH=3, and stirred for 6 hours. The acidified lignin was washed with a large amount of distilled water to neutralize the centrifuged sediment, and then dried in an oven at 50°C for 48 hours to obtain refined lignin. Grind the refined alkali lignin, pass it through a 90-120 mesh sieve, then mix it with water at a mass ratio of 1:10, ultrasonically impregnate for 30 minutes to become a suspension, and carry out hydrothermal carbonization in a hydrothermal reaction kettle with a hydrothermal temperat...

Embodiment 2

[0026] About 100 g of industrial alkali lignin containing ash is subjected to alkali-dissolving acid analysis treatment: the crude alkali lignin is dissolved in 10% aqueous sodium hydroxide solution so that the mass fraction of the lignin solution is not greater than 10%, and the insoluble matter is removed by filtration to obtain Purified alkali lignin solution. Then, at a temperature of 80° C. and a stirring speed of 180 rpm, concentrated sulfuric acid was added to make the solution pH=3, and stirred for 3 hours. The acidified lignin was washed with a large amount of distilled water to neutralize the centrifuged sediment, and then dried in an oven at 50°C for 48 hours to obtain refined lignin. Grind the refined alkali lignin, pass it through a 90-120 mesh sieve, then mix it with water at a mass ratio of 1:10, ultrasonically impregnate it for 15 minutes to become a suspension, add 20wt% citric acid and mix evenly, and carry out in a hydrothermal reaction kettle Hydrothermal ...

Embodiment 3

[0028]About 100 g of industrial alkali lignin containing ash is subjected to alkali-dissolving acid analysis treatment: the crude alkali lignin is dissolved in 10% aqueous sodium hydroxide solution so that the mass fraction of the lignin solution is not greater than 10%, and the insoluble matter is removed by filtration to obtain Purified alkali lignin solution. Then, at a temperature of 80° C. and a stirring speed of 200 rpm, concentrated sulfuric acid was added to make the solution pH=3, and stirred for 3 hours. The acidified lignin was washed with a large amount of distilled water to neutralize the centrifuged sediment, and then dried in an oven at 50°C for 48 hours to obtain refined lignin. Grind the refined alkali lignin, pass it through a 90-120 mesh sieve, then mix it with water at a mass ratio of 1:10, ultrasonically impregnate it for 20 minutes to become a suspension, add 40wt% acrylic acid and mix evenly, and carry out water heating in a hydrothermal reaction kettle....

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Abstract

The invention discloses a preparation method of a lignin-based hydrothermal-carbon sulfonic acid catalyst. The hydrothermal-carbon sulfonic acid catalyst is prepared from alkali lignin, which serves as a raw material, in industrial papermaking waste liquid through refining, hydrothermal carbonization and sulfonation; the solid acid is abundant in oxygen containing functional groups and has relatively good hydrophilicity and thermal stability, and the yield of reducing sugar, which is obtained through carrying out catalyzed hydrolysis on cellulose by the solid acid, can reach 50% to 75%. After reactions end, the catalyst is easy to separate and can be reused. The solid acid catalyst obtained by the method is simple in preparation process, is environmentally friendly and has relatively high catalytic activity, so that a new way for realizing the resource-converting utilization of biomass is developed.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a preparation method and application of a lignin-based hydrothermal charcoal sulfonic acid catalyst. Background technique [0002] Mineral resources such as coal, oil and natural gas are currently the most important energy sources, accounting for more than 80% of global energy consumption every year. At present, with the continuous increase of energy demand and the increasingly prominent problems related to fossil fuels, a large amount of consumption will inevitably lead to rapid depletion, and also bring huge environmental damage. People began to look for low-cost, renewable energy to replace the excessive dependence on fossil energy. In the utilization process of lignocellulose, biomass is used as raw material, and the biochemical conversion technology based on sugar platform has attracted much attention due to its advantages of environmental friendliness and mild conditions...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J31/02C13K1/02
CPCB01J31/0225C13K1/02
Inventor 甘林火朱俊东吕丽
Owner HUAQIAO UNIVERSITY
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