Method for preparing bio-oil by catalytically degrading lignin

A biomass oil and catalytic degradation technology, which is applied in the preparation of biological raw materials, liquid hydrocarbon mixtures, petroleum industry, etc., can solve the problems of unstable biomass oil yield, low biomass oil yield, and high reaction conditions. Inexpensive, selectivity-enhancing, alkali-metal-reducing effects

Active Publication Date: 2018-01-09
NANJING FORESTRY UNIV
View PDF4 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Patent CN102372607A discloses a method for preparing bio-oil from alkali lignin, which does not pretreat lignin, straw lignin alkali metal affects the catalytic activity, the yield of biomass oil is low, and using alkali compounds as solvents is not environmentally friendly , the reaction conditions are relatively high, for example, the reaction pressure needs to be 4-10Mpa; Chinese patent CN20141053976.8 discloses a method for preparing bio-oil by hydrodegrading lignin, which does not pretreat lignin, and the alkali metal contained in it affects the catalytic Activity, the yield of biomass oil is not stable

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for preparing bio-oil by catalytically degrading lignin
  • Method for preparing bio-oil by catalytically degrading lignin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Grind wheat straw lignin to 40 mesh, sieve, take 100g into a beaker containing 2L hydrochloric acid solution (pH=3), then stir at 50°C for 2 hours, then filter to obtain solid and wash with deionized water until neutral. Finally, the samples were dried to obtain pretreated lignin. The metal ion content in the pretreated lignin was detected, see Table 1.

[0026] 2) Weigh 50g of treated lignin, add 1g of Ru / C catalyst and mix evenly, then add 160ml of isopropanol, stir evenly and seal the reaction vessel, wherein the Ru content in Ru / C catalyst is 5wt%.

[0027] 3) Feed in nitrogen to drive away the air in the reactor, feed in hydrogen to drive away the nitrogen in the reactor, finally feed in hydrogen, and keep the pressure to 2.5Mpa.

[0028] 4) React at 280°C for 8 hours, put the reaction kettle into a cooler to cool, and filter the solution in the kettle to obtain solids and liquids after cooling.

[0029] 5) Add the obtained liquid to a rotary evaporator to ev...

Embodiment 2

[0036] 1) Grind wheat straw lignin to 40 mesh, sieve, take 100g into a beaker containing 2L hydrochloric acid solution (pH=3), then stir at 50°C for 2 hours, then filter to obtain solid and wash with deionized water until neutral. Finally, the samples were dried to obtain pretreated lignin.

[0037] 2) Weigh 50g of treated lignin, add 1.25g of Ru / C catalyst and mix evenly, add 200ml of isopropanol, stir evenly and seal the reaction vessel, wherein the Ru content in Ru / C catalyst is 8wt%.

[0038] 3) Feed in nitrogen to drive away the air in the reactor, feed in hydrogen to drive away the nitrogen in the reactor, finally feed in hydrogen, and keep the pressure to 2.5Mpa.

[0039] 4) React at 280°C for 6 hours, put the reaction kettle into a cooler to cool, and filter the solution in the kettle to obtain solids and liquids after cooling.

[0040] 5) Add the obtained liquid to a rotary evaporator to evaporate isopropanol, then add ethyl acetate to extract to obtain ethyl acetat...

Embodiment 3

[0047] 1) Grind wheat straw lignin to 40 mesh, sieve, take 100g into a beaker containing 2L hydrochloric acid solution (pH=3), then stir at 50°C for 2 hours, then filter to obtain solid and wash with deionized water until neutral. Finally, the samples were dried to obtain pretreated lignin.

[0048] 2) Weigh 50g of treated lignin, add 1.15g of Ru / C catalyst and mix evenly, heat 180ml of isopropanol, stir evenly and seal the reaction vessel, wherein the Ru content in Ru / C catalyst is 10wt%.

[0049] 3) Feed in nitrogen to drive away the air in the reactor, feed in hydrogen to drive away the nitrogen in the reactor, finally feed in hydrogen, and keep the pressure to 2.5Mpa.

[0050] 4) React at 280°C for 7 hours, put the reaction kettle into a cooler to cool, and filter the solution in the kettle to obtain solids and liquids after cooling.

[0051] 5) Add the obtained liquid to a rotary evaporator to evaporate isopropanol, then add ethyl acetate to extract to obtain ethyl acet...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for preparing bio-oil by catalytically degrading lignin. After lignin, serving as a raw material, is treated with acid, with isopropanol as a solvent, Ru/C as a catalyst, oxygen as a carrier gas and a high-pressure reaction kettle with a heating agitator as a reactor, the bio-oil is prepared by degradation, and lignin first undergoes acid soaking pretreatment. Since the alkali metal content of straw lignin is relatively high, the activity of the catalyst can be decreased; since the method first carries out acid pickling pretreatment on the lignin, the alkali metal content in the lignin can be greatly decreased, and thereby the activity of the catalyst is increased. Moreover, since the method disclosed by the invention adopts the isopropanol as the solvent,the price is low, and the impact on the environment is minor as well. The technological method greatly increases the yield of bio-oil, and the yield of produced oil reaches 72 percent; furthermore, the quality of the prepared bio-oil is high as well, and the C content of bio-oil reaches 69 percent; the selectivity of phenolic compound in oil can also be increased, and the selectivity of the phenolic compound in th oil reaches 53 percent.

Description

technical field [0001] The invention relates to a method for preparing biomass oil by catalytic degradation of lignin, and belongs to the field of utilization of biomass resources. Background technique [0002] Lignin is one of the three major components of biomass, and it is the only non-petroleum resource that can provide renewable aromatic compounds in nature. At present, the industrial application of lignin is mainly to produce polymer materials such as aldehyde resin and epoxy resin through chemical modification. However, due to the constraints of the market and other conditions, the utilization of lignin is also limited. The field of application is imminent. In recent years, the preparation of phenols by lignin degradation has become a research hotspot. Phenolic compounds are widely used in medicine, tobacco, flavors and fragrances and other industries, with higher added value and economic benefits. Scholars at home and abroad have done a lot of research on the degra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C10G3/00
CPCY02P30/20
Inventor 章一蒙成亮周秉亮周建斌
Owner NANJING FORESTRY UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap