CN104561183A - Pretreatment method for maize straws - Google Patents
Pretreatment method for maize straws Download PDFInfo
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- CN104561183A CN104561183A CN201510021573.7A CN201510021573A CN104561183A CN 104561183 A CN104561183 A CN 104561183A CN 201510021573 A CN201510021573 A CN 201510021573A CN 104561183 A CN104561183 A CN 104561183A
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Abstract
The invention provides a pretreatment method for maize straws. The pretreatment method comprises the following steps of placing the maize straws and ethylenediamine into a closed reactor, and heating to the temperature of 120-200 DEG C to react to obtain pretreated maize straws. According to the pretreatment method, ethylenediamine can be sufficiently and uniformly mixed with materials, so that the usage amount of ethylenediamine can be reduced; ethylenediamine has relatively strong alkalinity, so that ether bonds between lignin and hemicellulose can be opened, lignin can be degraded, cellulose and hemicellulose are retained to the maximum extent, and the enzymolysis efficiency of the pretreated maize straws is increased. The pretreatment method is simple in operation, free of high-pressure equipment, low in equipment requirement and energy consumption and suitable for industrial production.
Description
Technical field
The invention belongs to cellulosic ethanol technical field, be specifically related to a kind of pretreatment process of maize straw.
Background technology
Liquid fuel conveniently transports and is convenient to utilize, and has become important industry and daily energy derive.Wherein, oil is that at present the whole world uses maximum liquid fuels, but, the non-renewable and CO of petroleum resources
2the deterioration of environment can be caused with the discharge of other dusty gass.Develop the most important thing that reproducible clean energy becomes the energy development strategy of China.Ethanol is paid close attention to widely as the alternative cleaning liq energy and is paid attention to, the method of traditional mode of production ethanol take grain as raw material, adopt the method for yeast direct fermentation to produce ethanol, but this kind of method needs to consume a large amount of grain, face the problem of " strive ground with people, strive grain with people ".People turn one's attention to agricultural wastes gradually, as maize straw, broomcorn straw, wheat stalks etc., because agricultural wastes are also carbohydrate, and annual output is huge, maize straw, broomcorn straw, wheat stalk etc. just have 700,000,000 tons annual, these wastes can not get effective utilization and just can be burnt by peasant, not only waste energy but also contaminate environment.The glucose and xylose utilizing agricultural wastes and lignocellulose to obtain through enzymolysis after pre-treatment can utilize by yeast generation cellulosic ethanol; adopt and namely protect environment in this way; effectively make use of resource; having got back clean energy, is very promising Energy utilization patterns.
But at present, the bottleneck that restriction lignocellulose utilizes is due to high pre-treatment cost, and first the utilization of lignocellulose will destroy the rock steady structure of plant cell wall, remove xylogen, reduce degree of crystallinity, increase the contact area of substrate and enzyme, thus improve cellulosic enzymolysis efficiency.
Existing preprocessing means comprises: physical method, chemical process, physical chemistry-method and biological method.Physical method, mainly comprises mechanical crushing method, steam explosion, supercritical water treatment and wet oxygen method; Chemical process, mainly comprises alkaline purification, dilute acid pretreatment, concentrated acid process, oxidizer treatment and organic solvent process; Biological method adopts fungi to process lignocellulose.
In these pretreatment processs, alkaline process can open the ehter bond between xylogen and hemicellulose, removes xylogen, retains Mierocrystalline cellulose and hemicellulose largely.Alkaline matter conventional in prior art has ammoniacal liquor, liquefied ammonia, sodium hydroxide, unslaked lime etc.But, although adopt sodium hydroxide or unslaked lime to carry out at ambient pressure, after pre-treatment, need large water gaging to wash, removing alkaline reagents, and the discharge of alkaline reagents pollutes the environment; And need when carrying out pre-treatment with ammoniacal liquor or liquefied ammonia to adopt high-tension apparatus to carry out, condition is harsh.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is the pretreatment process providing a kind of maize straw, and pretreatment process of the present invention, without the need to adopting high-tension apparatus, requires low to conversion unit.
The invention provides a kind of pretreatment process of maize straw, comprise the following steps:
Maize straw and quadrol are placed in airtight reactor, under the condition of 120 ~ 200 DEG C, carry out reacting by heating, obtain pretreated maize straw.
Preferably, the dry-matter in described maize straw and the mass volume ratio of quadrol are 1g:(0.1 ~ 10) mL.
Preferably, the thickness of dividing of described maize straw is 0.5 ~ 5cm.
Preferably, the time of described reacting by heating is 0.5 ~ 5h.
Preferably, after carrying out reacting by heating, also comprise and maize straw is carried out cooling and drying successively.
Preferably, the temperature of described cooling is 50 ~ 110 DEG C.
Preferably, the temperature of described oven dry is 70 ~ 180 DEG C.
Compared with prior art, the invention provides a kind of pretreatment process of maize straw, comprise the following steps: maize straw and quadrol are placed in airtight reactor, under the condition of 120 ~ 200 DEG C, carry out reacting by heating, obtain pretreated maize straw.The present invention can fully make quadrol and material mix, save the usage quantity of quadrol, quadrol has stronger alkalescence, the ehter bond between xylogen and hemicellulose can be opened, lignin degrading, retain Mierocrystalline cellulose and hemicellulose largely, the enzymolysis efficiency of pretreated maize straw is improved.The present invention is simple to operate, and without the need to adopting high-tension apparatus, low for equipment requirements, energy consumption is low, is applicable to suitability for industrialized production.
Result shows, the yield of the glucose of maize straw after pre-treatment enzymolysis is 40 ~ 90%.
Embodiment
The invention provides a kind of pretreatment process of maize straw, comprise the following steps:
Maize straw and quadrol are placed in airtight reactor, under the condition of 120 ~ 200 DEG C, carry out reacting by heating, obtain pretreated maize straw.
The present invention is preferably to pass through broken maize straw for raw material.Wherein, the degree of crushing of the present invention to described maize straw does not have particular restriction.Above-mentioned maize straw and quadrol are placed in airtight reactor, and wherein, the dry-matter in described maize straw and the mass volume ratio of quadrol are 1g:(0.1 ~ 10) mL.In one embodiment of the invention, dry-matter in described maize straw and the mass volume ratio of quadrol are 1g:5mL, in another embodiment of the present invention, dry-matter in described maize straw and the mass volume ratio of quadrol are 1g:10mL, in another embodiment of the present invention, the dry-matter in described maize straw and the mass volume ratio of quadrol are 1g:0.1mL.
In the present invention, preferably described maize straw is divided uniformly in pallet, to increase the contact area with quadrol.Wherein, the thickness of dividing of described maize straw is preferably 0.5 ~ 5cm, in one embodiment of the invention, the thickness of dividing of described maize straw is 0.5cm, in another embodiment of the present invention, the thickness of dividing of described maize straw is 2cm, and in another embodiment of the present invention, the thickness of dividing of described maize straw is 5cm.
The feed postition of the present invention to described quadrol does not have particular restriction, preferably quadrol is placed in the bottom of closed reactor.
After maize straw and quadrol being placed, carry out reacting by heating.The temperature of described reacting by heating is 120 ~ 200 DEG C, under this temperature condition, quadrol is evaporated to gaseous state by liquid state, fully contact with maize straw, save the usage quantity of quadrol, quadrol has stronger alkalescence, can open the ehter bond between xylogen and hemicellulose, lignin degrading, retains Mierocrystalline cellulose and hemicellulose largely.The time of described reacting by heating is 0.5 ~ 5h.The pressure of reacting by heating is the true pressure in closed reactor.After reacting by heating terminates, obtain pretreated maize straw.In one embodiment of the invention, the temperature of described reacting by heating is 150 DEG C, and the reaction times is 3h; In another embodiment of the present invention, the temperature of described reacting by heating is 200 DEG C, and the reaction times is 5h; In another embodiment of the present invention, the temperature of described reacting by heating is 120 DEG C, and the reaction times is 0.5h.
In the present invention, after reacting by heating terminates, also comprise and maize straw is carried out cooling and drying successively.In the present invention, the temperature of described cooling is 50 ~ 110 DEG C, under said temperature condition, and quadrol condensation of gas.Dried by maize straw, the temperature of described oven dry is 70 ~ 180 DEG C again.After oven dry terminates, obtain pretreated maize straw.
The present invention can fully make quadrol and material mix, save the usage quantity of quadrol, quadrol has stronger alkalescence, the ehter bond between xylogen and hemicellulose can be opened, lignin degrading, retain Mierocrystalline cellulose and hemicellulose largely, the enzymolysis efficiency of pretreated maize straw is improved.The present invention is simple to operate, and without the need to adopting high-tension apparatus, low for equipment requirements, energy consumption is low, is applicable to suitability for industrialized production.
Result shows, the yield of the glucose of maize straw after pre-treatment enzymolysis is 40 ~ 90%.
In order to understand the present invention further, be described below in conjunction with the pretreatment process of embodiment to maize straw provided by the invention, protection scope of the present invention is not limited by the following examples.
Embodiment 1
To take the dry matter content shredded be 5g water content be 5% maize straw divide on pallet, thickness is 0.5cm, puts into reactor, adds 25ml quadrol at reactor bottom, closed reactor, raise temperature of reactor to 150 DEG C, reaction 3h, by reactor cooling to 110 DEG C, the whole condensation of quadrol gas in question response device, open reactor upper cover, be again warming up to 180 DEG C of drying solids, obtain pretreated maize straw.
Pretreated maize straw is through saccharification analysis, and glucose yield is 90%.
Embodiment 2:
To take the dry matter content shredded be 5g water content be 60% maize straw divide on pallet, thickness is 2cm, puts into reactor, adds 50ml quadrol at reactor bottom, closed reactor, raise temperature of reactor to 200 DEG C, reaction 5h, by reactor cooling to 90 DEG C, the whole condensation of quadrol gas in question response device, open reactor upper cover, be again warming up to 120 DEG C of drying solids, obtain pretreated maize straw.
Pretreated maize straw is through saccharification analysis, and glucose yield is 79%.
Embodiment 3:
To take the dry matter content shredded be 5g water content be 40% maize straw divide on pallet, thickness is 5cm, puts into reactor, adds 0.5ml quadrol at reactor bottom, closed reactor, raise temperature of reactor to 120 DEG C, reaction 0.5h, by reactor cooling to 50 DEG C, the whole condensation of quadrol gas in question response device, open reactor upper cover, be again warming up to 70 DEG C of drying solids, obtain pretreated maize straw.
Pretreated maize straw is through saccharification analysis, and glucose yield is 40%.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. a pretreatment process for maize straw, is characterized in that, comprises the following steps:
Maize straw and quadrol are placed in airtight reactor, under the condition of 120 ~ 200 DEG C, carry out reacting by heating, obtain pretreated maize straw.
2. pretreatment process according to claim 1, is characterized in that, the dry-matter in described maize straw and the mass volume ratio of quadrol are 1g:(0.1 ~ 10) mL.
3. pretreatment process according to claim 1, is characterized in that, the thickness of dividing of described maize straw is 0.5 ~ 5cm.
4. pretreatment process according to claim 1, is characterized in that, the time of described reacting by heating is 0.5 ~ 5h.
5. pretreatment process according to claim 1, is characterized in that, after carrying out reacting by heating, also comprises and is carried out successively cooling and drying by maize straw.
6. pretreatment process according to claim 5, is characterized in that, the temperature of described cooling is 50 ~ 110 DEG C.
7. pretreatment process according to claim 5, is characterized in that, the temperature of described oven dry is 70 ~ 180 DEG C.
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| CN201510021573.7A CN104561183B (en) | 2015-01-16 | 2015-01-16 | A kind of preprocess method of corn stover |
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| CN201510021573.7A CN104561183B (en) | 2015-01-16 | 2015-01-16 | A kind of preprocess method of corn stover |
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| CN104561183B CN104561183B (en) | 2019-01-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086106A (en) * | 2016-06-14 | 2016-11-09 | 江南大学 | A kind of many hydrogen bond donors eutectic solvent pretreatment corn straw and circulation utilization method thereof |
| CN106834360A (en) * | 2017-03-06 | 2017-06-13 | 上海交通大学 | The preprocess method and device of a kind of lignocellulosic material |
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| CN102076859A (en) * | 2008-04-30 | 2011-05-25 | 希乐克公司 | biomass processing |
| CN102257150A (en) * | 2008-12-19 | 2011-11-23 | 纳幕尔杜邦公司 | Organic solvent pretreatment of biomass to enhance enzymatic saccharification |
| CN102257151A (en) * | 2008-12-19 | 2011-11-23 | 纳幕尔杜邦公司 | Organic solvent pretreatment of biomass to enhance enzymatic saccharification |
| EP2816124A1 (en) * | 2012-02-13 | 2014-12-24 | Toray Industries, Inc. | Method for producing sugar solution, sugar solution, and method for producing ethanol |
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2015
- 2015-01-16 CN CN201510021573.7A patent/CN104561183B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102076859A (en) * | 2008-04-30 | 2011-05-25 | 希乐克公司 | biomass processing |
| CN102257150A (en) * | 2008-12-19 | 2011-11-23 | 纳幕尔杜邦公司 | Organic solvent pretreatment of biomass to enhance enzymatic saccharification |
| CN102257151A (en) * | 2008-12-19 | 2011-11-23 | 纳幕尔杜邦公司 | Organic solvent pretreatment of biomass to enhance enzymatic saccharification |
| EP2816124A1 (en) * | 2012-02-13 | 2014-12-24 | Toray Industries, Inc. | Method for producing sugar solution, sugar solution, and method for producing ethanol |
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| 孟华等: "纤维素预处理后的结构及溶液流变性能", 《纺织学报》 * |
| 苏茂尧等: "预处理对纤维素微结构和反应性能影响的研究", 《华南理工大学学报（自然科学版）》 * |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106086106A (en) * | 2016-06-14 | 2016-11-09 | 江南大学 | A kind of many hydrogen bond donors eutectic solvent pretreatment corn straw and circulation utilization method thereof |
| CN106834360A (en) * | 2017-03-06 | 2017-06-13 | 上海交通大学 | The preprocess method and device of a kind of lignocellulosic material |
| CN106834360B (en) * | 2017-03-06 | 2020-06-26 | 上海交通大学 | Pretreatment method and device for lignocellulose raw material |
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| CN104561183B (en) | 2019-01-22 |
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