CN102311982A - Pretreatment method for efficiently saccharifying straws - Google Patents
Pretreatment method for efficiently saccharifying straws Download PDFInfo
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- CN102311982A CN102311982A CN2010102211225A CN201010221122A CN102311982A CN 102311982 A CN102311982 A CN 102311982A CN 2010102211225 A CN2010102211225 A CN 2010102211225A CN 201010221122 A CN201010221122 A CN 201010221122A CN 102311982 A CN102311982 A CN 102311982A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E50/00—Technologies for the production of fuel of non-fossil origin
- Y02E50/10—Biofuels, e.g. bio-diesel
Abstract
The invention discloses a pretreatment method for efficiently saccharifying straws, which comprises the following steps: firstly, carrying out acidification reaction on raw material serum comprising straw particles, a peroxide, inorganic salt and an inorganic acid at the temperature of 150-180 DEG C for 1-15min; then, cooling to 100-130 DEG C to continue to react for 1-30min; and finally, cooling to terminate the reaction, and separating a solid-liquid product, wherein a liquid product is hydrolysis sugar liquid, and a solid is an enzymolysis raw material. The pretreatment method for efficiently saccharifying the straws has a simple operation flow, short treatment time, low energy consumption, high straw use ratio and a good saccharifying effect.
Description
Technical field
The present invention relates to a kind of pretreatment process of stalk efficiently saccharifying, specifically relate to a kind of pretreatment process that improves Mierocrystalline cellulose and semicellulose efficiently saccharifying in the stalk.
Background technology
The main chemical compositions of stalk is Mierocrystalline cellulose, semicellulose, xylogen, and the gross weight of above-mentioned three kinds of materials is basically about 70%.Mierocrystalline cellulose and semicellulose be degraded into glucose, wood sugar be master's glucide and be converted into liquid fuel and industrial chemicals is one of desirable approach that efficiently utilizes stalk.
Enzymic hydrolysis is one of effective means of stalk saccharification, mainly is to utilize cellulase with the glucose of the cellulose conversion in the stalk for being utilized.The important factor that influences saccharification efficient in the enzymatic saccharification process, saccharification speed and hydrolysis sugar composition is xylogen and the hemicellulose components in the lignocellulose; Therefore straw is carried out pre-treatment to remove semicellulose and the influence of xylogen to the lignocellulose saccharification, be present cellulose raw material saccharification utilization gordian technique.Stalk pre-treatment at present has several different methods, is broadly divided into three kinds of physics method, chemical method and biological processes.Wherein, chemical method mainly adopts Mierocrystalline cellulose, semicellulose and the xylogen in acid, alkali and the organic solvent de-fibering raw material.
Zhang Xuquan etc. have reported the influence factor of utilizing dilute sulphuric acid that corn straw is hydrolyzed in " Mierocrystalline cellulose science and technology " the 10th volume the 2nd phase P32-36 " preliminary study of corn straw dilute sulphuric acid pretreatment condition ".At h 2 so 4 concentration is 1.0%, 120 ℃ of hydrolysis temperatures, hydrolysis time 2h; Straw powder granularity 20～40 orders; The stalk massfraction is that the percent hydrolysis of stalk is 19.2% under 10% the hydrolysising condition, and what contents of monosaccharides was maximum in the hydrolyzed solution is wood sugar; Secondly be pectinose and glucose, also have a fraction of semi-lactosi.The efficient of this method saccharification is low, and hydrolysis time is long, and the monose of generation continues easily to transform and loses.
Li etc. have reported in " Bioresource Technology " the 100th volume 23 phase P5865-5871 " Corn stover pretreatment by inorganic salts and its effects on hemicellulose and cellulose degradation " and have utilized inorganic metal salt hydrolysis corn straw.At FeCl
3Mass concentration is 1.6%, 140 ℃ of hydrolysis temperatures, and hydrolysis time 20min, stalk granularity 2mm, under the hydrolysising condition of solid quality content 10%, 91% semicellulose is degraded, and wherein 60% changes into wood sugar.The usage quantity of inorganic metal salt is big in this method, and cost is high, and contents of monosaccharides is low in the hydrolyzed solution.
US20060124124 discloses a kind of biomass material pretreatment process.This method adopts one section acidification reaction that raw material is carried out pre-treatment; The acidification reaction temperature is 170 ℃-200 ℃; Reaction times is 1-40min, before carrying out acidification reaction, must hydrogen peroxide, iron(ic)chloride and vitriolic mixed aqueous solution be joined in the biomass material, under 50 ℃ of-70 ℃ of temperature, soaks 6-24 hour; Hydrogen peroxide slowly decomposes in the immersion process, and iron(ic)chloride content is at least 90mg/L in the mixed aqueous solution.After acidification reaction finished, mixed solution directly carried out enzymolysis without separating.Though this method has reduced the usage quantity of inorganic metal salt, stalk must soak for a long time before the acidification reaction, and at least more than six hours, so pretreatment process is long, and in the process of soaking, needs to continue heat supply, and energy expenditure is big.
Summary of the invention
To the deficiency of prior art, the straw pretreatment method that the present invention provides a kind of segmentation to carry out acidification reaction, this method operating process is short, and energy consumption is low, and the utilization ratio height and the saccharification result of stalk are good.
The pretreatment process of stalk efficiently saccharifying of the present invention comprises following content; At first the raw slurry of stalk particle, superoxide, inorganic salt and mineral acid composition carries out acidification reaction at 150 ℃～180 ℃, and the reaction times is 1～15min, continues reaction 1～30min at 100 ℃～130 ℃ then; The termination reaction of lowering the temperature at last; Separation is with the liquid product, and product liquid is a hydrolysis sugar liquid, and solid is as the enzymolysis raw material.
The superoxide that contains in the raw slurry of the present invention is one or more of hydrogen peroxide, manganese peroxide, calcium superoxide, Magnesium Superoxol, preferred hydrogen peroxide.The massfraction of superoxide in raw slurry is 0.05%～0.2%.
The granularity of stalk particle is at 4～10 orders among the present invention, and the massfraction of stalk particle in raw slurry is 10%～15%.Stalk is one or more in corn straw, straw, rice straw, the sorghum stalk etc.
Employed mineral acid is one or more in sulfuric acid, hydrochloric acid, phosphoric acid, the nitric acid among the present invention, preferably sulfuric acid.The massfraction of mineral acid in raw slurry is 0.1%～1.0%.
Inorganic metal salt described in the present invention comprises one or more in iron(ic)chloride, iron protochloride, ferric sulfate, calcium chloride, magnesium chloride, cupric chloride, copper sulfate, zinc chloride, aluminum chloride, tin chloride, the tin protochloride etc., preferred iron(ic)chloride.The massfraction that inorganic metal salt accounts for raw slurry is 0.003%～0.025%.
Cellulase described in the present invention can be made by oneself according to prior art, also can adopt commercially available cellulase commodity.
The pretreatment process of stalk efficiently saccharifying of the present invention adopts two sections acidification reaction treating processess of low temperature behind the first high temperature; At first under comparatively high temps, make the semicellulose in the stalk that mixtures such as hydrolysis generation semicellulose monose, disaccharides and oligosaccharide take place fast; Then under lower temperature; The further hydrolysis of semicellulose, the disaccharides and the oligosaccharide of hydrolysis of hemicellulose are decomposed to form monose simultaneously, and have avoided the decomposition loss of monose under hot conditions.The inventive method can be removed the semicellulose in the stalk effectively, the content of monose in cellulosic enzymolysis efficiency and the semicellulose liquid glucose in the raising stalk.The inventive method is in high temperature acidified reaction process; The superoxide that contains in the raw slurry can decomposite oxyradical; The stalk particle reaction that under oxyradical and inorganic salt and mineral acid synergy, is hydrolyzed; Improve the speed of hydrolysis and reduced the consumption and the hydrolysis temperature of inorganic metal salt, shortened hydrolysis time, further reduced the decomposition loss of hydrolysis monose.In addition, the inventive method can directly be carried out acidification reaction after raw materials mix, need not immersion treatment, shortened the treatment time, and simplified the flow process of handling, reduced energy consumption.
Embodiment
Further specify scheme of the present invention and effect through embodiment below.
Embodiment 1
To pass through corn stalk pellets (4-10 order), massfraction 0.5% sulfuric acid, massfraction 0.003% iron(ic)chloride, massfraction 0.05% ydrogen peroxide 50 pulverizing and sieve mixes; Wherein the stalk particle mass concentration 10%; Heat temperature raising to 160 ℃ reacted 10 minutes, was cooled to 120 ℃ then; Reacted the cooling termination reaction again 10 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 2.21%, and calculating hydrolysis of hemicellulose is 88.4% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 85.3%, calculating the cellulose hydrolysis inversion rate of glucose is 81.6%.
Semicellulose sugar transformation efficiency calculation formula is following:
Embodiment 2
To pass through corn stalk pellets (4-10 order), massfraction 0.2% sulfuric acid, massfraction 0.025% iron(ic)chloride, massfraction 0.2% ydrogen peroxide 50 pulverizing and sieve mixes; Wherein the stalk particle mass concentration 15%; Heat temperature raising to 170 ℃ reacted 5 minutes, was cooled to 110 ℃ then; Reacted the cooling termination reaction again 30 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 1.90%, and calculating hydrolysis of hemicellulose is 76.0% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 82.9%, calculating the cellulose hydrolysis inversion rate of glucose is 79.4%.
Embodiment 3
To pass through corn stalk pellets (4-10 order), massfraction 0.9% sulfuric acid, massfraction 0.025% iron(ic)chloride, massfraction 0.05% ydrogen peroxide 50 pulverizing and sieve mixes; Wherein the stalk particle mass concentration 10%; Heat temperature raising to 160 ℃ reacted 10 minutes, was cooled to 130 ℃ then; Reacted the cooling termination reaction again 5 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 2.08%, and calculating hydrolysis of hemicellulose is 83.2% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 86.5%, calculating the cellulose hydrolysis inversion rate of glucose is 82.7%.
Embodiment 4
To pass through corn stalk pellets (4-10 order), massfraction 0.9% sulfuric acid, massfraction 0.005% iron(ic)chloride, massfraction 0.1% ydrogen peroxide 50 pulverizing and sieve mixes; Wherein the stalk particle mass concentration 15%; Heat temperature raising to 150 ℃ reacted 15 minutes, was cooled to 100 ℃ then; Reacted the cooling termination reaction again 30 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 2.26%, and calculating hydrolysis of hemicellulose is 90.4% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 84.6%, calculating the cellulose hydrolysis inversion rate of glucose is 80.9%.
Embodiment 5
To pass through corn stalk pellets (4-10 order), massfraction 0.6% sulfuric acid, massfraction 0.003% iron(ic)chloride, massfraction 0.05% ydrogen peroxide 50 pulverizing and sieve mixes; Wherein the stalk particle mass concentration 10%; Heat temperature raising to 180 ℃ reacted 5 minutes, was cooled to 130 ℃ then; Reacted the cooling termination reaction again 10 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 2.17%, and calculating hydrolysis of hemicellulose is 86.8% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 81.7%, calculating the cellulose hydrolysis inversion rate of glucose is 78.4%.
Embodiment 6
To pass through corn stalk pellets (4-10 order), massfraction 0.9% sulfuric acid, massfraction 0.003% iron(ic)chloride, massfraction 0.05% ydrogen peroxide 50 pulverizing and sieve mixes; Wherein the stalk particle mass concentration 10%; Heat temperature raising to 160 ℃ reacted 10 minutes, was cooled to 120 ℃ then; Reacted the cooling termination reaction again 10 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 2.21%, and calculating hydrolysis of hemicellulose is 88.4% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 25FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 92.2%, calculating cellulose hydrolysis glucose transformation efficiency is 87.7%.
Comparative Examples 1
To pass through corn stalk pellets (4-10 order), massfraction 0.9% sulfuric acid, massfraction 0.003% iron(ic)chloride, massfraction 0.05% ydrogen peroxide 50 pulverizing and sieve mixes; Wherein the stalk particle mass concentration 10%; Heat temperature raising to 160 ℃ reacted 20 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 1.76%, and calculating hydrolysis of hemicellulose is 70.4% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 81.1%, calculating the cellulose hydrolysis inversion rate of glucose is 77.8%.
Comparative Examples 2
To pass through corn stalk pellets (4-10 order), massfraction 1.5% sulfuric acid, massfraction 0.003% iron(ic)chloride, massfraction 0.05% ydrogen peroxide 50 pulverizing and sieve and mix, wherein the stalk particle mass concentration 10%, and heat temperature raising to 120 ℃ reacted 0 minute.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 1.81%, and calculating hydrolysis of hemicellulose is 72.4% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make with liquor ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 82.5%, calculating the cellulose hydrolysis inversion rate of glucose is 79.1%.
Comparative Examples 3
To through mixed 60 ℃ of immersions 6 hours that are incorporated in of corn stalk pellets (4-10 order), massfraction 0.9% sulfuric acid, massfraction 0.003% iron(ic)chloride, massfraction 0.05% ydrogen peroxide 50 pulverizing and sieve; Wherein the stalk particle mass concentration 10%; Heat temperature raising to 180 ℃ reacted 10 minutes.After the cooling of question response mixture; Push and filter; Filtrating then promptly gets semicellulose sugar hydrolyzed solution through neutralization, filtration, and semicellulose sugar (wood sugar+semi-lactosi+pectinose) liquid mass concentration is 1.43%, and calculating hydrolysis of hemicellulose is 57.2% for the monose transformation efficiency.Filter residue adds cellulase solution after washing to make solid-to-liquid ratio be 1: 10 with buffering solution; The pH value is transferred to 5.0; In 50 ℃ of hydrolysis 72 hours, the consumption of cellulase was a 20FPU/ gram Mierocrystalline cellulose, obtains containing the hydrolyzed solution of glucose and can be used for fermenting alcohol; Cellulose hydrolysis rate 67.6%, calculating the cellulose hydrolysis inversion rate of glucose is 62.0%.
Can know from comparative example; Not segmentation of s.t. is carried out (Comparative Examples 1 and 2) or is carried out pre-treatment according to the process of US20060124124 (Comparative Examples 3); All can not in increasing hydrolyzed solution, improve enzymolysis efficiency in the contents of monosaccharides, have only present method could improve contents of monosaccharides and enzymolysis efficiency in the hydrolyzed solution simultaneously.
Claims (10)
1. the pretreatment process of a stalk efficiently saccharifying; It is characterized in that comprising following content: at first the raw slurry of stalk particle, superoxide, inorganic salt and mineral acid composition carries out acidification reaction at 150 ℃～180 ℃, and the reaction times is 1-15min, continues reaction 1-30min at 100 ℃-130 ℃ then; The termination reaction of lowering the temperature at last; Separate the solid-liquid product, product liquid is a hydrolysis sugar liquid, and solid is as the enzymolysis raw material.
2. the method for claim 1 is characterized in that: described superoxide is one or more of hydrogen peroxide, manganese peroxide, calcium superoxide, Magnesium Superoxol.
3. according to claim 1 or claim 2 method, it is characterized in that: the massfraction of described superoxide in raw slurry is 0.05%～0.2%.
4. the method for claim 1, it is characterized in that: the granularity of described stalk particle is at 4～10 orders, and the massfraction that stalk particle accounts for raw slurry is 10%～15%.
5. like claim 1 or 4 described methods, it is characterized in that: stalk particle is selected from one or more in corn straw, straw, rice straw, the sorghum stalk.
6. the method for claim 1, it is characterized in that: described mineral acid is one or more in sulfuric acid, hydrochloric acid, phosphoric acid, the nitric acid.
7. like claim 1 or 6 described methods, it is characterized in that: the massfraction of the add-on of said mineral acid in raw slurry is 0.1%～1.0%.
8. the method for claim 1, it is characterized in that: described inorganic metal salt is one or more in iron(ic)chloride, iron protochloride, ferric sulfate, calcium chloride, magnesium chloride, cupric chloride, copper sulfate, zinc chloride, aluminum chloride, tin chloride, the tin protochloride.
9. like claim 1 or 8 described methods, it is characterized in that: the massfraction that described inorganic metal salt accounts for raw slurry is 0.003%～0.025%.
10. the method for claim 1 is characterized in that: used cellulase is commercially available cellulase commodity or makes by oneself according to prior art in the said enzymolysis.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102733218A (en) * | 2012-02-23 | 2012-10-17 | 重庆恒远晋通科技有限公司 | Method for extracting cellulose from tobacco waste based on aluminium chloride process |
| CN103898245A (en) * | 2014-04-23 | 2014-07-02 | 哈尔滨工业大学 | Efficient saccharification processing method for maize straws |
| CN110747236A (en) * | 2018-07-23 | 2020-02-04 | 天津市职业大学 | Pretreatment method of lignocellulose and application thereof in improving lignocellulose enzymolysis efficiency |
| CN113183266A (en) * | 2021-04-27 | 2021-07-30 | 中南林业科技大学 | Method for pretreating poplar fibers by hydrothermal-peroxyacetate metal salt cooperation |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060124124A1 (en) * | 2004-12-14 | 2006-06-15 | Gas Technology Institute | Hydroxyl radical/dilute acid hydrolysis of lignocellulosic materials |
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2010
- 2010-07-07 CN CN201010221122.5A patent/CN102311982B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060124124A1 (en) * | 2004-12-14 | 2006-06-15 | Gas Technology Institute | Hydroxyl radical/dilute acid hydrolysis of lignocellulosic materials |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102733218A (en) * | 2012-02-23 | 2012-10-17 | 重庆恒远晋通科技有限公司 | Method for extracting cellulose from tobacco waste based on aluminium chloride process |
| CN103898245A (en) * | 2014-04-23 | 2014-07-02 | 哈尔滨工业大学 | Efficient saccharification processing method for maize straws |
| CN110747236A (en) * | 2018-07-23 | 2020-02-04 | 天津市职业大学 | Pretreatment method of lignocellulose and application thereof in improving lignocellulose enzymolysis efficiency |
| CN113183266A (en) * | 2021-04-27 | 2021-07-30 | 中南林业科技大学 | Method for pretreating poplar fibers by hydrothermal-peroxyacetate metal salt cooperation |
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