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Method for utilizing straw biomass by grades

A biomass and straw technology, applied in sugar production, biofuels, lignin derivatives, etc., can solve the problems of the application effect of lignin derivatives, poor performance, and difficulty in preparing high value-added products, etc. Biomass utilization, overcoming feedback inhibition, overcoming the effect of high production costs

Inactive Publication Date: 2010-02-10
CENT FOR CLEAN ENERGY TECH OF SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because the chemical functional groups of lignin are destroyed during the papermaking process, the performance is poor, and it is difficult to prepare high value-added products, which also greatly affects the application effect of these lignin derivatives

Method used

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  • Method for utilizing straw biomass by grades
  • Method for utilizing straw biomass by grades
  • Method for utilizing straw biomass by grades

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Example 1 , steam explosion (steam explosion)

[0034] In this embodiment, a steam explosion reaction tank is used to steam-explode straw materials. The steam explosion reaction tank can be, for example, the steam explosion tank disclosed in the Chinese Utility Model Patent No. 01218677.6. The specific structure is as follows figure 2 As shown, the tank body 10 is included, the top of the tank body 10 is provided with a feed port 11, and the bottom is provided with a discharge port 12 and a slag discharge port 13. In addition, the upper part of the tank body 10 is provided with a saturated steam flower tube 14, and the lower part is provided with a saturated steam flower tube 14. A saturated steam nozzle 15 is arranged, and a compressed gas mixture (air and saturated steam) nozzle 16 is provided in the middle.

[0035] As shown in Table 1, using straws such as bean stalks and corncobs as raw materials, steam explosion reaction tanks were used for steam explosion, and...

Embodiment 2

[0040] Example 2 , Separation of hemicellulose, cellulose and lignin from steam-exploded straw

[0041]The steam-exploded stalk (hemicellulose, cellulose and lignin) that embodiment 1 obtains is soaked in the hot water of 75 ℃ with the concentration of 15wt%, carries out extraction after 4 hours, to isolate water-soluble hemicellulose ( Xylose and xylooligosaccharides), water-insoluble cellulose and lignin are still retained in the straw, the specific extraction method is as follows:

[0042] a) Repeated extraction (sample 1~3)

[0043] Four times of repeated extractions were used, and the filtrate obtained from each extraction was used to extract new steam-exploded straw. The sugar concentrations of hemicellulose in the obtained extracts were 92.6g / l, 85.3g / l and 83.9g / l (corresponding to samples 1~3);

[0044] b) Continuous extraction (samples 4-6)

[0045] Adopt 4 times of continuous extraction, in the course of operation, materials and water are continuously reversely...

Embodiment 3

[0046] Example 3 , Purification and concentration of xylooligosaccharides

[0047] Get the extract obtained in Example 2, heat and concentrate to 1 / 4 of its volume, put the concentrated solution on an activated carbon chromatography column (height-to-diameter ratio is 5-10), then elute with 60% ethanol, collect the eluted Liquid was tested with 3,5-dinitrosalicylic acid method, and the collection was stopped until it no longer contained reducing sugars, and the eluents collected were combined and analyzed by HPLC. The analysis results showed that the obtained reducing sugars were active xylooligosaccharides .

[0048] Under the temperature condition of 40°C, the collected active xylooligosaccharides were evaporated under reduced pressure to remove the ethanol contained therein (which can be recycled and reused), and then the active xylooligosaccharides were obtained by nanofiltration with a content of about 50%. % syrup. The syrup is a colorless and transparent viscous slu...

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Abstract

The invention discloses a method for utilizing straw biomass by grades, comprising the following steps: carrying out steam explosion to straw biomass; extracting and separating water soluble constituents and water insoluble constituents in steam exploded straw by water, wherein the water soluble constituents are purified and concentrated to obtain active low polyxylose and xylose and the water insoluble constituents are used for further fermentation to generate ethanol; and extracting lignin from the fermentation residue. The invention realizes the maximization of utilization of biomass and overcomes the disadvantages of high production cost, low efficiency and environmental pollution and the like in the prior art.

Description

technical field [0001] The invention belongs to the technical field of biomass utilization, in particular, it relates to a method for graded utilization of straw-like biomass, and more specifically, it relates to realizing the three main components of cellulose from straw-like biomass through physical and chemical methods. A method for converting and separating hemicellulose and lignin. Background technique [0002] Due to the increasing shortage of traditional energy sources, the use of renewable energy including biomass (including about 40% cellulose, about 30% hemicellulose and about 30% lignin) is on the rise and is expected to Play an important role in the future energy structure. At present, the most representative biomass energy utilization technologies are biomass biochemical conversion and thermochemical conversion technology, among which biochemical conversion technology has been considered as the most important technology because of its low energy consumption, mi...

Claims

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Application Information

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IPC IPC(8): C13K13/00C12P7/10C07G1/00D21B1/36
CPCY02E50/16Y02E50/10
Inventor 田丰黄伟光
Owner CENT FOR CLEAN ENERGY TECH OF SHANGHAI
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