Rapid evaluation method for quality of lignin-pyrolyzed bio-oil based on radical detection and application thereof

Patent metadata

Field	Value
Publication number	US-2023194449-A1
Application number	US-202118008722-A
Country	US
Kind code	A1
Filing date	Oct 13, 2021
Priority date	Dec 30, 2020
Publication date	Jun 22, 2023
Grant date	—

Abstract

The present invention discloses a rapid evaluation method for quality of lignin-pyrolyzed bio-oil and an application thereof, and particularly relates to a rapid evaluation method for quality of lignin-pyrolyzed bio-oil based on radical detection and an application thereof. The method can be used to evaluate the quality of lignin-pyrolyzed bio-oil by detecting the spin concentration of radicals in lignin char obtained by lignin pyrolysis, thus avoiding the complex processes involved in the evaluation for the quality of conventional pyrolyzed bio-oils such as, extraction, separation and detection and reducing the detection costs substantially. The detection method of the present invention is simple and easy to operate, thus achieving the rapid evaluation for the quality of lignin-pyrolyzed bio-oil. Moreover, the detection method of the present invention is non-contact detection without destructive samples, which is applicable to the rapid detection on the quality of lignin-pyrolyzed bio-oil in the field of industry and scientific research. The present invention further broadens the application fields of radical detection and contributes to the development of radical detection technology in the field of pyrolysis, and provides a reliable method for the detection of lignin-pyrolyzed bio-oil, which has good application prospect.

First claim

1 . A rapid evaluation method for quality of lignin-pyrolyzed bio-oil based on radical detection, comprising steps of:
pyrolyzing lignin to prepare a lignin char; detecting a spin concentration of radicals in the lignin char; and evaluating quality of a lignin-pyrolyzed bio-oil according to the spin concentration of radicals; wherein the lower the spin concentration of radicals is, the better the quality of the lignin-pyrolyzed bio-oil is; the quality of the lignin-pyrolyzed bio-oil is capable of being represented by detecting a monomer yield of the lignin-pyrolyzed bio-oil, and the higher the monomer yield of the lignin-pyrolyzed bio-oil is, the better the quality of the lignin-pyrolyzed bio-oil is; wherein the method for preparing the lignin char comprises steps of: placing the detected lignin and plastic with a mass ratio to a material area of a pyrolysis reactor; sealing the pyrolysis reactor and purging with an inert gas until the pyrolysis reactor is filled with the inert gas, and then turning on the pyrolysis reactor and heating up to a preset temperature; putting the lignin and the plastic to a pyrolysis area for pyrolysis after the pyrolysis reactor is stabilized at the preset temperature; and at the end of the pyrolysis, collecting a solid product derived from the lignin pyrolysis and washing to remove adhered bio-oil with an organic solvent, and performing drying to obtain the lignin char.

2 . (canceled)

3 . The evaluation method according to claim 1 , wherein the method for detecting the spin concentration of radicals in the lignin char comprises:
grinding the lignin char to a powder having a grain size less than 0.5 mm, and then detecting a spin concentration of radicals in the powder.

4 . The evaluation method according to claim 3 , wherein the method for detecting the spin concentration of radicals in the powder comprises: putting the ground lignin char powder having a grain size less than 0.5 mm to a quartz tube, and detecting the spin concentration of radicals by an electron paramagnetic resonance spectrometer.

5 . The evaluation method according to claim 1 , wherein the placement mode of the lignin and the plastic is one of mechanical blending, contact-type layered placement and non-contact layered placement.

6 . The evaluation method according to claim 1 , wherein the mass ratio of the lignin to the plastic ranges from (0.1-10):1.

7 . The evaluation method according to claim 1 , wherein the lignin and the plastic are co-pyrolyzed at 300-1200° C. and the pyrolysis time is 10 s−1 h.

8 . The evaluation method according to claim 1 , wherein the organic solvent used for washing the solid product derived from the lignin pyrolysis is at least one of methyl alcohol, ethyl alcohol, propyl alcohol, isopropyl alcohol, acetone, diethyl ether, ethyl acetate, n-hexane, benzene, methylbenzene, tetrachloromethane, trichloromethane, dichloromethane, N,N-dimethyl formamide, dimethyl sulfoxide and 1,4-dioxane.

9 . The evaluation method according to claim 1 , wherein the lignin is one of native lignin, industrial lignin or laboratory-prepared lignin; the plastic is at least one of polyethylene, polyvinyl chloride, polypropylene, acrylonitrile-butadiene-styrene copolymer, polyethylene terephthalate, polystyrene and polymethyl methacrylate.

10 . An application of the rapid evaluation method for quality of lignin-pyrolyzed bio-oil based on radical detection of claim 1 in the rapid evaluation for the quality of bio-oil pyrolyzed by lignin.

Assignees

• Univ Southeast

Inventors

• Xiao Rui
• Fan Yuyang
• Liu Chao
• Lei Ming
• Kong Xiangchen
• Xu Weicong

Classifications

• G01N24/10 Primary

  by using electron paramagnetic resonance (G01N24/12 takes precedence) · CPC title

• C10G2300/1014

  of vegetal origin · CPC title

• C10G2300/201

  Impurities · CPC title

• C10G1/002 Primary

  in combination with oil conversion- or refining processes · CPC title

• G01N30/06

  Preparation · CPC title