Method for preparing aromatic-rich bio-oil by liquefying lignin with supercritical mixed solvent

A technology for aromatic compounds and lignin, which is used in the preparation of liquid hydrocarbon mixtures, petroleum industry, processing of hydrocarbon oils, etc., can solve problems such as low chemical potential, and achieve the effects of high conversion efficiency, economical price, and low energy consumption

Active Publication Date: 2018-08-07
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Supercritical carbon dioxide is widely used as a solvent, separation medium and reaction medium. Its disadvantage is that when it is used as a reactant, it often needs to use a rare noble metal as a catalyst because of its low chemical position.

Method used

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  • Method for preparing aromatic-rich bio-oil by liquefying lignin with supercritical mixed solvent
  • Method for preparing aromatic-rich bio-oil by liquefying lignin with supercritical mixed solvent
  • Method for preparing aromatic-rich bio-oil by liquefying lignin with supercritical mixed solvent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1 Effect of the mass volume ratio of raw material and solvent on the yield of aromatic compounds in bio-oil

[0045] 1 Alkali lignin pretreatment

[0046] S11. Preliminary grinding and placement

[0047] Take 3~5 clean petri dishes, use a sampling spoon to spoon a part of the lignin into the mortar, crush the large-grained lignin as much as possible, then use the sampling spoon to take a small part of the lignin to the petri dish, and spread it on the petri dish At the bottom, the powder coverage height is below 1.5 mm.

[0048] S12. Preliminary drying

[0049] The petri dish and mortar in S11 were scattered and dried in a vacuum oven at 65 °C for 4 h, and vacuumed for 2–5 min every 15 min.

[0050] S13. Grinding again

[0051] After taking out the petri dish and mortar in S12, pour the lignin in the petri dish into the mortar, pulverize the large particles of lignin, and spread the lignin to the bottom of the petri dish with a sampling spoon after the pulve...

Embodiment 2

[0067] Example 2 The influence of reaction temperature on the yield of aromatic compounds in bio-oil when the reaction medium is a mixed solvent

[0068] Add 2 g of dried lignin powder with a particle size of 40-60 mesh and 120 mL of mixed solvent (methanol:ethanol 1:0.5~1:1.5) into a batch autoclave with a volume of 500 mL and a magnetic stirrer After sealing, the temperature was raised to 340 °C, and the reaction was kept at this temperature for 60 min. Cool to room temperature and collect the product.

[0069] Products that are gaseous at normal temperature and pressure are gas phase products. Wash the inner wall of the reactor with acetone, collect the solid-liquid mixed product, extract it with acetone, and filter it with a vacuum pump. The filtrate evaporates the organic solvent with a rotary evaporator, and the remaining substance is bio-oil. Finally, the acetone-insoluble material was the residual solid.

[0070] The bio-oil produced by the liquefaction of lignin at...

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Abstract

The invention discloses a method for preparing bio-oil enriched in aromatic compounds through a supercritical mixed organic solvent liquefied lignin. The method comprises the following steps: adding alkali lignin and a low-molecule organic solvent under supercritical conditions to a pressure-resistant container with a magnetic stirring device, reacting under the conditions of the temperature of 280-340 DEG C and the pressure of 8.8-16.0MPa for 0-120 minutes, cooling to room temperature, and collecting the product, thereby obtaining the bio-oil, wherein a ratio of the usage amount of the alkali lignin to the mixed solvent is (1-3g):(60-120mL). According to the method disclosed by the invention, the supercritical mixed low-molecule organic solvent and the like are taken as reaction media, the concentration and activity of hydroxyl and hydrogen group produced in a supercritical state can be greatly improved along with rise of the reaction temperature, and the hydroxyl and hydrogen group have obvious effects of promoting liquefied conversion from the lignin to the bio-oil. Moreover, the method is mild in reaction conditions, low in performance requirements of equipment materials, economic in price, high in application and popularization properties and high in yield of the aromatic compounds in the bio-oil.

Description

technical field [0001] The invention belongs to the technical field of energy and chemical industry, and more specifically relates to a method for preparing bio-oil rich in aromatic compounds by liquefying lignin with a supercritical mixed organic solvent. Background technique [0002] With the great improvement of the material civilization of human society and the rapid economic development momentum, every city needs huge resources such as electric energy and fuel, and the trend of decreasing fossil resources is already a certainty. Accelerate the development of renewable resources and the development of green energy It is imminent and has become a key research topic in today's energy research and development. With the crisis of fossil energy resources, high prices and social concern for environmental protection, people will seek renewable bio-energy to replace fossil energy. Biomass refers to all renewable substances derived from animals and plants in organic matter excep...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G1/00C10G1/04
CPCC10G1/00C10G1/04C10G2300/1014
Inventor 解新安魏星樊荻李雁李璐
Owner SOUTH CHINA AGRI UNIV
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