CN109628652B - Method for preparing xylose by one-step catalysis of hemicellulose in corn straws - Google Patents
Method for preparing xylose by one-step catalysis of hemicellulose in corn straws Download PDFInfo
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- CN109628652B CN109628652B CN201811543196.3A CN201811543196A CN109628652B CN 109628652 B CN109628652 B CN 109628652B CN 201811543196 A CN201811543196 A CN 201811543196A CN 109628652 B CN109628652 B CN 109628652B
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- SRBFZHDQGSBBOR-IOVATXLUSA-N D-xylopyranose Chemical compound O[C@@H]1COC(O)[C@H](O)[C@H]1O SRBFZHDQGSBBOR-IOVATXLUSA-N 0.000 title claims abstract description 90
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 title claims abstract description 45
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 239000010902 straw Substances 0.000 title claims abstract description 43
- 240000008042 Zea mays Species 0.000 title claims abstract description 37
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 title claims abstract description 37
- 235000002017 Zea mays subsp mays Nutrition 0.000 title claims abstract description 37
- 235000005822 corn Nutrition 0.000 title claims abstract description 37
- 229920002488 Hemicellulose Polymers 0.000 title claims abstract description 32
- 238000000034 method Methods 0.000 title claims abstract description 29
- 238000006555 catalytic reaction Methods 0.000 title abstract description 5
- 238000006243 chemical reaction Methods 0.000 claims abstract description 64
- 239000003054 catalyst Substances 0.000 claims abstract description 28
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims abstract description 27
- 239000002994 raw material Substances 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 12
- 239000012298 atmosphere Substances 0.000 claims description 6
- 239000011261 inert gas Substances 0.000 claims description 6
- 239000000203 mixture Substances 0.000 claims description 6
- 238000010438 heat treatment Methods 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 239000012299 nitrogen atmosphere Substances 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 238000002360 preparation method Methods 0.000 claims 5
- 229920002678 cellulose Polymers 0.000 abstract description 14
- 239000001913 cellulose Substances 0.000 abstract description 14
- 229920005610 lignin Polymers 0.000 abstract description 13
- 239000002028 Biomass Substances 0.000 abstract description 7
- 239000000126 substance Substances 0.000 abstract description 4
- 239000006227 byproduct Substances 0.000 abstract description 3
- 238000009776 industrial production Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 9
- 230000035484 reaction time Effects 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 6
- 150000007522 mineralic acids Chemical class 0.000 description 6
- 239000002699 waste material Substances 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- AMVQGJHFDJVOOB-UHFFFAOYSA-H aluminium sulfate octadecahydrate Chemical compound O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O AMVQGJHFDJVOOB-UHFFFAOYSA-H 0.000 description 4
- 235000011128 aluminium sulphate Nutrition 0.000 description 4
- 239000001164 aluminium sulphate Substances 0.000 description 4
- BUACSMWVFUNQET-UHFFFAOYSA-H dialuminum;trisulfate;hydrate Chemical compound O.[Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O BUACSMWVFUNQET-UHFFFAOYSA-H 0.000 description 4
- 239000000843 powder Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- 241000609240 Ambelania acida Species 0.000 description 3
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 3
- 239000010905 bagasse Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000003912 environmental pollution Methods 0.000 description 3
- 239000012263 liquid product Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 239000010907 stover Substances 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- YLQBMQCUIZJEEH-UHFFFAOYSA-N Furan Chemical compound C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 239000002154 agricultural waste Substances 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 238000000855 fermentation Methods 0.000 description 2
- 230000004151 fermentation Effects 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 2
- 239000002029 lignocellulosic biomass Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- BDAGIHXWWSANSR-UHFFFAOYSA-N methanoic acid Natural products OC=O BDAGIHXWWSANSR-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 238000000746 purification Methods 0.000 description 2
- 239000012429 reaction media Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 238000000967 suction filtration Methods 0.000 description 2
- OSWFIVFLDKOXQC-UHFFFAOYSA-N 4-(3-methoxyphenyl)aniline Chemical compound COC1=CC=CC(C=2C=CC(N)=CC=2)=C1 OSWFIVFLDKOXQC-UHFFFAOYSA-N 0.000 description 1
- 241000501754 Astronotus ocellatus Species 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- 240000008790 Musa x paradisiaca Species 0.000 description 1
- 235000018290 Musa x paradisiaca Nutrition 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 210000002421 cell wall Anatomy 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 235000019253 formic acid Nutrition 0.000 description 1
- 238000004128 high performance liquid chromatography Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 150000002989 phenols Chemical class 0.000 description 1
- 229920001282 polysaccharide Polymers 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000007086 side reaction Methods 0.000 description 1
- 238000007873 sieving Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13K—SACCHARIDES OBTAINED FROM NATURAL SOURCES OR BY HYDROLYSIS OF NATURALLY OCCURRING DISACCHARIDES, OLIGOSACCHARIDES OR POLYSACCHARIDES
- C13K13/00—Sugars not otherwise provided for in this class
- C13K13/002—Xylose
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Organic Chemistry (AREA)
- Catalysts (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the field of biomass resource utilization, and particularly relates to a method for preparing xylose by one-step catalysis of hemicellulose in corn straws. In particular to a method for preparing xylose by taking aluminum sulfate as a catalyst and hemicellulose in corn straws as a single raw material source. The invention creatively uses aluminum sulfate to only catalyze the hemicellulose in the corn straws to produce xylose with high selectivity, and the conversion efficiency is high; the method has strong pertinence, hardly catalyzes and converts cellulose and lignin in the corn straws, reserves the structural integrity of the two substances for other use, avoids generating other unnecessary byproducts, and obtains high purity xylose. The reaction method is simple and low in cost, and can be widely applied to industrial production.
Description
Technical Field
The invention belongs to the field of biomass resource utilization, and particularly relates to a method for preparing xylose by one-step catalysis of hemicellulose in corn straws.
Background
With the increasing energy crisis and environmental pollution, the development of renewable lignocellulosic biomass for the production of high value-added chemicals is imminent. The corn straw resources in China are very rich, but the rich renewable resources are not effectively utilized, and most of the resources are burned, so that huge resource waste and environmental pollution are caused. Therefore, there is a need to develop an efficient corn stalk biorefinery industry.
Corn stalks are a typical biomass and mainly consist of three major components, namely hemicellulose, cellulose and lignin. In lignocellulosic biomass, hemicellulose is the second largest carbohydrate polymer that makes up the plant cell wall structure, second only to cellulose, and generally accounts for 15% to 30%. Meanwhile, xylose is a typical five-carbon sugar and is an important raw material for utilizing lignocellulose by biological fermentation. Therefore, the corn straw is used as a reaction raw material, the hemicellulose of the corn straw is selectively converted, the cellulose and lignin components are reserved, the xylose is obtained with high yield and high selectivity, and the method has important significance for further utilizing the xylose to obtain products with high added values by subsequent biological fermentation.
In the prior art, inorganic acid is generally used as a catalyst to react hemicellulose in straws to produce xylose. For example, in patent publication No. CN107267688A, 70% of xylose (based on the mass of hemicellulose in raw lignocellulose) can be obtained by soaking bagasse as a raw material in an acid solution at 50 ℃ for 8 hours, and then subjecting the resultant material to disc milling for 10 minutes under the conditions of steam heating and pressurization at 0.3 MPa. As another example, Oscar OYola-river et al report in Biomass and Bioenergy119(2018)284-292 that banana peel is used as raw material, 0.50 wt% H2SO4As a catalyst, 80:20 wt% GVL: H2O as the reaction medium, was raised to 490K at a heating rate of 0.5K/min, and 41% xylose (based on the initial carbon moles of cellulose and hemicellulose in the feedstock) was obtained. But inorganic acid is used as a catalyst, so that the catalyst has certain corrosivity on reaction equipment; moreover, the part of inorganic acid is difficult to recycle from the reaction system, which causes waste of raw materials; meanwhile, the inorganic acid also causes certain risks to human health and environment.
Furthermore, Zhang Hongdan et al reported in Bioresource Technology 249(2018)395-3As a catalyst, 11.4% xylose (calculated on the mass of bagasse) can be obtained by treating bagasse with 60% ethanol solvent at 160 ℃ for 1 h. The method uses FeCl3The method overcomes the defect of using inorganic acid as a catalyst, but in the treatment process, the hemicellulose is converted, simultaneously, the lignin is also converted, and the obtained liquid product is a complex mixture jointly consisting of carboxylic acid, furan, phenols, saccharides, oligomers and the like, so that the selectivity of xylose is low, and the obtained purity is not high.
Whether in the form of mineral acids or FeCl3As a catalyst, the hemicellulose is converted while the cellulose and/or lignin components are also converted. On one hand, the conversion of cellulose and lignin has no promotion effect on the generation of xylose, and can influence the forward progress of the reaction for generating xylose; a series of byproducts are also generated, which affect the purity of the target product xylose and finallyFurther, purification and the like are required. On the other hand, the method destroys the structures of cellulose and lignin, does not effectively utilize the cellulose and the lignin, and causes a great deal of resource waste.
Therefore, the development of the method which is low in cost, green and environment-friendly, and can directionally and efficiently generate xylose by only utilizing the hemicellulose in the corn straws has important practical significance.
Disclosure of Invention
The invention aims to provide a method for producing xylose by directionally and efficiently utilizing hemicellulose in corn straws, which is low in cost, green and environment-friendly.
In order to achieve the purpose of the invention, the technical scheme adopted by the invention is as follows: a method for preparing xylose uses hemicellulose in straws as a single raw material source to prepare xylose. It should be understood that the straw is directly used as the raw material, and the hemicellulose in the straw is directionally utilized; pure hemicellulose, which has been extracted commercially from corn stover, is not used as a feedstock. The invention directly takes the primary biomass (straws) as the starting material, is more favorable for realizing the resource utilization of the agricultural waste biomass, thereby realizing the industrial popularization.
Preferably, aluminum sulfate is used as the catalyst.
Preferably, the aluminum sulfate is hydrated aluminum sulfate.
Preferably, the method specifically comprises the following steps: uniformly mixing the straws, aluminum sulfate and water necessary for reaction, placing the mixture in the inert gas atmosphere, heating the mixture from room temperature to 100-180 ℃ in 0.3-0.6 h, and then reacting for 0-4 h.
Preferably, the straw is mixed with the following components in percentage by mass: 20: 1-5 of aluminum sulfate.
Preferably, the straw is mixed with the following components in percentage by mass: 20: 3-5 of aluminum sulfate.
Preferably, the reaction temperature is 130-140 ℃, and/or the reaction time is 0.5-4 h.
Preferably, the inert gas atmosphere is a nitrogen atmosphere.
Preferably, the initial pressure of the inert gas atmosphere is 2 MPa.
Preferably, the straw is corn straw.
The invention has the following beneficial effects:
1. the raw materials used in the invention are all rich in sources, cheap and easily available. Corn stalks are common agricultural waste biomass, and the waste is changed into valuable, so that the problems of environmental pollution and resource waste can be effectively solved. Hydrated aluminum sulfate is a common cheap chemical product, has high catalytic activity and is environment-friendly, and the problems that the traditional catalyst such as inorganic acid corrodes equipment and is inconvenient for subsequent treatment are effectively solved.
2. The invention creatively uses aluminum sulfate to only catalyze the hemicellulose in the corn straws to produce xylose with high selectivity, and the conversion efficiency is high; the method has strong pertinence, hardly catalyzes and converts cellulose and lignin in the corn straw, retains the structural integrity of the two substances for other uses, avoids generating other unnecessary byproducts, and obtains high xylose purity.
3. The reaction method is simple and low in cost, and can be widely applied to industrial production.
Detailed Description
The specific reaction method comprises the following steps: the method comprises the steps of crushing corn straws, sieving the crushed corn straws with a 40-100-mesh sieve, placing the sieved corn straws in a high-pressure reaction kettle, taking water as a solvent and a reaction medium (the mass ratio of the water to the corn straws is 100: 1-10), and taking aluminum sulfate as a catalyst. Setting the initial pressure in the reaction kettle to be 2MPa, raising the temperature from room temperature to 100-180 ℃ at a constant speed in a nitrogen atmosphere, wherein the total temperature rise time is 0.3-0.6 h, and carrying out closed reaction for 0-4 h after the target temperature is reached.
And after the reaction is finished, rapidly cooling the reaction kettle by flushing with running water, collecting a product in the kettle after the reaction kettle is cooled to room temperature, and performing suction filtration and separation to obtain solid residue and liquid, wherein the liquid is the required product.
Wherein, according to the mass ratio, the corn straw: the aluminum sulfate is 20:1 to 5, preferably 20:3 to 5. The low dosage of aluminum sulfate can affect the conversion rate of hemicellulose, thereby affecting the yield of xylose; too high a quantity of raw materials is wasted. The aluminum sulfate is preferably hydrated aluminum sulfate, which is more commonly and easily available and cheaper than aluminum sulfate, and the presence of crystal water in the hydrated aluminum sulfate is more favorable for forward reaction.
The reaction temperature in the present invention is preferably 130 ℃ to 140 ℃. When the reaction temperature is lower than 130 ℃, the conversion rate of hemicellulose in the corn straws is lower, so that the yield of the obtained xylose is lower. When the reaction temperature is higher than 140 ℃, although the hemicellulose in the corn stalks can be almost completely dissolved, a part of the cellulose and the lignin are simultaneously converted. Moreover, with the increase of the temperature, the generated xylose can be further converted into small molecular products such as furfural, formic acid, acetic acid and the like or subjected to a repolymerization reaction, so that the yield of the xylose is reduced.
The reaction time of the method is preferably 0.5-4 h. If the reaction time is too short and is less than 0.5h, the conversion rate of hemicellulose is only about 60 percent, so that the yield of xylose is low. The reaction time is prolonged, the conversion rate of hemicellulose is increased, and the yield of xylose is increased. Within 0.5-4 h, the conversion rate of hemicellulose is continuously kept about 90%, and the yield of xylose is relatively stable. Further extension of the reaction time may lead to other side reactions.
The present invention is further illustrated below with reference to specific examples. Wherein, the corn straws in the embodiment come from Sichuan province in double-flow county of city, and the corn straws are crushed and sieved by a 40-mesh sieve. The corn stalk powder was determined to contain 17.5 wt% hemicellulose, 36.5 wt% cellulose, 20.9 wt% lignin, 8.2 wt% moisture, 3.5 wt% wax, 5.8 wt% ash, and 7.6 wt% other materials.
Example 1: influence of reaction temperature
1. The 6 sets of reactions were carried out under the same conditions except that the target temperature was different. A150 mL autoclave was charged with 4g of corn stover powder and 100mL of water. Sealing the reaction kettle, replacing air in the reaction kettle with nitrogen, adjusting the initial pressure of the nitrogen in the reaction kettle to be 2.0MPa, and maintaining the stirring speed to be 400 rpm. The reactor is heated from room temperature to the target temperature at a constant speed within 0.5h, namely 120-200 ℃, and then the target temperature is maintained for 2 h. After the reaction is finished, the reaction is quickly flushed and cooled by flowing water. And when the reaction system is cooled to room temperature, pouring out the mixture in the reaction kettle, and performing suction filtration and separation by using filter paper to obtain solid residues and liquid products.
The solid residue is used for calculating the conversion rate of the raw material and the content of three major components in the corn straw. The content of the three major components in the corn straws is determined by a paradigm titration method. And calculating the conversion rate of the three components under corresponding conditions according to the content of the three components in the corn straws measured under different treatment conditions. The liquid product was analyzed using high performance liquid chromatography. Wherein the xylose yield is calculated based on the hemicellulose content in the corn stover. Specific results are shown in table 1.
Table 1 table of reaction results for each group
2. The procedure was exactly the same as in step 1 except for the test temperature and the reaction materials. The reaction raw materials of the step are: 4g of corn stalk powder, 100mL of water and 1g of aluminum sulfate octadecahydrate. Because the catalyst was added in this step, the required initial reaction temperature was lower, so the test temperature was adjusted accordingly, see table 2 for each set of temperatures and results.
TABLE 2 tables of reaction results for each group
As can be seen from tables 1 and 2, without the catalyst, the xylose yield at 180 ℃ was the highest, 14.1%; at 130 ℃, the conversion rate of hemicellulose is only 36.1 percent; with the catalyst, the xylose yield reached the highest at 130 ℃ of 61.2%, and the hemicellulose conversion had reached 90.8% at this time.
Example 2: influence of the catalyst
The following 20 sets of reactions were carried out in the same manner as in set 10 and set 11 of example 1, and the kind of catalyst, reaction temperature and results of each set are shown in Table 3. Because of too many catalysts tested, the reaction time of each group is 2h, only the effect of each group of catalysts is shown, and the optimal reaction is not shownTime. Wherein with H2SO4(pH 3.24) was used as a catalyst, and the pH was the same as that of 100mL of water containing 1g of aluminum sulfate octadecahydrate completely dissolved. With H2SO4(pH 1.35) as a catalyst, the pH was the same as the pH at which 1g of aluminum sulfate octadecahydrate in 100mL of water was completely hydrolyzed to form sulfuric acid.
Table 3 table of reaction results of each group
As can be seen from Table 3, the use of ferric chloride gives a slightly higher yield of xylose than the use of aluminum sulfate, but at the same time the conversion of cellulose and lignin is much higher than when aluminum sulfate is used. This indicates that the product obtained by using ferric trichloride is more complex, and the purification, utilization and the like of the target product at the later stage are more difficult. The other catalysts such as sulfuric acid and the like have obvious effect which is not the same as aluminum sulfate.
In addition, when aluminum sulfate is used as a catalyst at a relatively high temperature, the conversion of cellulose and lignin is also increased, so that the reaction is preferably carried out at a relatively low temperature.
It can also be seen from table 3 that at higher temperatures, the yield of xylose is lower using aluminium sulphate as catalyst, because at this temperature the xylose produced by aluminium sulphate catalysis is further converted to other products, demonstrating that aluminium sulphate has a higher catalytic activity towards hemicellulose in the straw than other catalysts, again demonstrating that aluminium sulphate is used as catalyst, if one wants to obtain xylose specifically, a lower temperature needs to be chosen.
Example 3: influence of the amount of catalyst
The reactions were carried out in the same manner as in example 1, group 9 for 0.5 hour for 6 groups, and the kinds and amounts of the catalysts of the respective groups and the results are shown in Table 5.
Table 4 table of reaction results of each group
Example 4: influence of reaction time
1. 5 groups of reactions were carried out according to the method of example 1, group 5 (reaction temperature 180 ℃ C.), and the reaction time of each group was 0 to 4 hours. Specific results are shown in table 5.
TABLE 5 tables of reaction results for each group
2. The reaction is carried out according to the method of the step 1, but the reaction temperature is selected to be 130 ℃, 4g of corn straw powder, 100mL of water and 1g of aluminum sulfate octadecahydrate are added into a reaction kettle, and 5 groups of reactions are carried out. The results are shown in Table 6.
TABLE 6 tables of reaction results for each group
Claims (6)
1. A method for producing xylose, comprising: preparing xylose by taking hemicellulose in straws as a single raw material source; aluminum sulfate is used as a catalyst; the method specifically comprises the following steps: uniformly mixing straws, aluminum sulfate and water necessary for reaction, putting the mixture in an inert gas atmosphere, heating the mixture from room temperature to 130-140 ℃ within 0.3-0.6 h, and reacting for 0.5-4 h; according to the mass ratio, the straw: aluminum sulfate =20: 1-5.
2. The process for the preparation of xylose according to claim 1, characterized by the fact that: the aluminum sulfate is hydrated aluminum sulfate.
3. The process for the preparation of xylose according to claim 1, characterized by the fact that: according to the mass ratio, the straw: aluminum sulfate =20: 3-5.
4. The process for the preparation of xylose according to claim 1, characterized by the fact that: the inert gas atmosphere is nitrogen atmosphere.
5. The process for the preparation of xylose according to claim 1, characterized by the fact that: the initial pressure of the inert gas atmosphere is 2 MPa.
6. The process for the preparation of xylose according to claim 1, characterized by the fact that: the straw is corn straw.
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| CN105713050A (en) * | 2016-01-21 | 2016-06-29 | 河南农业大学 | Method for selectively degrading cob hemicellulose to increase xylose yield |
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| CN105713050A (en) * | 2016-01-21 | 2016-06-29 | 河南农业大学 | Method for selectively degrading cob hemicellulose to increase xylose yield |
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