Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for efficiently and cleanly degrading lignin in straw biomass

A biomass and lignin technology, applied in biofuels, energy wastewater treatment, textiles and papermaking, etc., can solve problems such as difficult direct degradation and utilization, and achieve the effect of improving resource utilization and low cost

Pending Publication Date: 2022-08-09
SOUTHEAST UNIV
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because the lignin in the composition structure of straw has a highly cross-linked polymer structure, which wraps cellulose and hemicellulose, making it difficult to be directly degraded and utilized

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 efficiently and cleanly degrading lignin in straw biomass
  • Method for efficiently and cleanly degrading lignin in straw biomass
  • Method for efficiently and cleanly degrading lignin in straw biomass

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Sesame straw, washed and dried in an oven. Then, use a small pulverizer to crush the washed and dried sesame straws and pass through a 60-mesh sieve, and repeat this operation until all the sesame straws are completely sieved. The sieved powder was collected and kept dry in a vacuum desiccator.

Embodiment 2

[0042] Experiment on the effect of photocatalyst concentration on the degradation rate of lignin: Weigh 2.5g of dry sesame straw powder into a 250mL conical flask, weigh 50mg, 100mg, 150mg, 200mg, 250mg of TiO 2A conical flask was added, and 250 mL of distilled water was added, and ultrasonically dispersed for 15 min. After fully mixing, adjust the pH value of the system to 10, and move it into a photocatalytic reaction device, absorb it in the dark for 35 minutes, and then turn on the ultraviolet lamp (wavelength 254 nm) to irradiate for 6 hours to carry out the photocatalytic reaction. After the reaction, the sample was separated by suction filtration and washed with distilled water until the washing solution was neutral. The washed samples were placed in a constant temperature drying oven at 80°C and dried to constant weight. When TiO 2 When the mass concentration is 0.8g / L, the cellulose content reaches the maximum, which is 55.02%.

Embodiment 3

[0044] Experiment on the effect of the pH value of the catalytic system on the degradation rate of lignin: Weigh 2.5g of dry sesame straw powder and 150mg of TiO 2 Placed in a 250mL conical flask and added 250mL distilled water, ultrasonically dispersed for 15min. After fully mixing, adjust the pH value of the system to 6, 7, 8, 9, 11, 12, respectively, and move it into the photocatalytic reaction device, absorb it in the dark for 35 minutes, and then turn on the ultraviolet lamp (wavelength 254nm) for 6 hours of photocatalysis. reaction. After the reaction, the sample was separated by suction filtration and washed with distilled water until the washing solution was neutral. The washed samples were placed in a constant temperature drying oven at 80°C and dried to constant weight. When the initial pH of the photocatalytic system was 10.0, the mass concentration of lignin reached the lowest value of 14.07%, and the content of cellulose reached the maximum value of 54.88%.

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 efficiently and cleanly degrading lignin in straw biomass, which is characterized in that the lignin in the biomass of sesame straw is degraded by a photocatalysis method at room temperature, and a biomass precursor with high cellulose content and low lignin content is obtained by optimizing photocatalysis reaction conditions. After the biomass provided by the invention is subjected to photocatalytic degradation, the highest cellulose content can reach 55.43%, and the lignin content can be reduced to 9.96%.

Description

technical field [0001] The invention relates to a biomass material method, in particular to an efficient and clean method for degrading lignin in straw biomass. Background technique [0002] Due to the increasing shortage of non-renewable resources such as coal and oil, biomass energy has become the focus of research as a cheap, green and renewable energy source. Among them, straw biomass is rich in cellulose and hemicellulose resources, which can be used to prepare high value-added products such as adsorbents, biomass ethanol, and superabsorbent resins. Therefore, its efficient utilization can generate huge economic benefits. and ecological benefits. [0003] In the process of utilizing straw resources, researchers found that the efficiency of direct utilization is not high. This is because the lignin existing in the composition structure of straw has a highly cross-linked polymeric structure, which encapsulates cellulose and hemicellulose, making it difficult to be direc...

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
IPC IPC(8): D21C5/00D21B1/02
CPCD21C5/00D21B1/02Y02W10/37
Inventor 吉远辉张洋程龙
Owner SOUTHEAST UNIV