WO2008096971A1 - Method of producing xylitol using hydrolysate containing xylose and arabinose prepared from byproduct of tropical fruit biomass - Google Patents
Method of producing xylitol using hydrolysate containing xylose and arabinose prepared from byproduct of tropical fruit biomass Download PDFInfo
- Publication number
- WO2008096971A1 WO2008096971A1 PCT/KR2008/000457 KR2008000457W WO2008096971A1 WO 2008096971 A1 WO2008096971 A1 WO 2008096971A1 KR 2008000457 W KR2008000457 W KR 2008000457W WO 2008096971 A1 WO2008096971 A1 WO 2008096971A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- hydrolysate
- xylose
- arabinose
- xylitol
- preparing
- Prior art date
Links
- 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 156
- PYMYPHUHKUWMLA-UHFFFAOYSA-N arabinose Natural products OCC(O)C(O)C(O)C=O PYMYPHUHKUWMLA-UHFFFAOYSA-N 0.000 title claims abstract description 138
- SRBFZHDQGSBBOR-UHFFFAOYSA-N beta-D-Pyranose-Lyxose Natural products OC1COC(O)C(O)C1O SRBFZHDQGSBBOR-UHFFFAOYSA-N 0.000 title claims abstract description 136
- 239000000413 hydrolysate Substances 0.000 title claims abstract description 65
- PYMYPHUHKUWMLA-WDCZJNDASA-N arabinose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)C=O PYMYPHUHKUWMLA-WDCZJNDASA-N 0.000 title claims abstract description 58
- TVXBFESIOXBWNM-UHFFFAOYSA-N Xylitol Natural products OCCC(O)C(O)C(O)CCO TVXBFESIOXBWNM-UHFFFAOYSA-N 0.000 title claims abstract description 56
- HEBKCHPVOIAQTA-UHFFFAOYSA-N meso ribitol Natural products OCC(O)C(O)C(O)CO HEBKCHPVOIAQTA-UHFFFAOYSA-N 0.000 title claims abstract description 56
- 239000000811 xylitol Substances 0.000 title claims abstract description 56
- HEBKCHPVOIAQTA-SCDXWVJYSA-N xylitol Chemical compound OC[C@H](O)[C@@H](O)[C@H](O)CO HEBKCHPVOIAQTA-SCDXWVJYSA-N 0.000 title claims abstract description 56
- 229960002675 xylitol Drugs 0.000 title claims abstract description 56
- 235000010447 xylitol Nutrition 0.000 title claims abstract description 56
- 238000000034 method Methods 0.000 title claims abstract description 55
- 235000013399 edible fruits Nutrition 0.000 title claims abstract description 31
- 239000006227 byproduct Substances 0.000 title claims abstract description 27
- 239000002028 Biomass Substances 0.000 title claims abstract description 24
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 45
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 41
- 238000000909 electrodialysis Methods 0.000 claims abstract description 26
- 244000060011 Cocos nucifera Species 0.000 claims abstract description 22
- 235000013162 Cocos nucifera Nutrition 0.000 claims abstract description 22
- 238000003763 carbonization Methods 0.000 claims abstract description 15
- 239000002253 acid Substances 0.000 claims abstract description 9
- 230000004913 activation Effects 0.000 claims abstract description 9
- 240000003133 Elaeis guineensis Species 0.000 claims abstract description 6
- 235000001950 Elaeis guineensis Nutrition 0.000 claims abstract description 6
- 238000005903 acid hydrolysis reaction Methods 0.000 claims description 22
- 239000003014 ion exchange membrane Substances 0.000 claims description 7
- 239000012528 membrane Substances 0.000 claims description 4
- 238000001556 precipitation Methods 0.000 claims description 4
- 150000001450 anions Chemical class 0.000 claims description 2
- 150000001768 cations Chemical class 0.000 claims description 2
- 238000005342 ion exchange Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 26
- 238000000855 fermentation Methods 0.000 abstract description 18
- 230000004151 fermentation Effects 0.000 abstract description 18
- 230000007062 hydrolysis Effects 0.000 abstract description 17
- 238000006460 hydrolysis reaction Methods 0.000 abstract description 17
- 238000000746 purification Methods 0.000 abstract description 14
- 238000001994 activation Methods 0.000 abstract description 10
- 238000002360 preparation method Methods 0.000 abstract description 10
- 244000005700 microbiome Species 0.000 description 24
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- 238000006243 chemical reaction Methods 0.000 description 20
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- NWUYHJFMYQTDRP-UHFFFAOYSA-N 1,2-bis(ethenyl)benzene;1-ethenyl-2-ethylbenzene;styrene Chemical compound C=CC1=CC=CC=C1.CCC1=CC=CC=C1C=C.C=CC1=CC=CC=C1C=C NWUYHJFMYQTDRP-UHFFFAOYSA-N 0.000 description 12
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 10
- 239000003456 ion exchange resin Substances 0.000 description 10
- 229920003303 ion-exchange polymer Polymers 0.000 description 10
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- 239000000126 substance Substances 0.000 description 9
- 150000002500 ions Chemical class 0.000 description 8
- 239000003513 alkali Substances 0.000 description 7
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 description 7
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- MYRTYDVEIRVNKP-UHFFFAOYSA-N 1,2-Divinylbenzene Chemical compound C=CC1=CC=CC=C1C=C MYRTYDVEIRVNKP-UHFFFAOYSA-N 0.000 description 4
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 229920002488 Hemicellulose Polymers 0.000 description 4
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 4
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- MUBZPKHOEPUJKR-UHFFFAOYSA-N Oxalic acid Chemical compound OC(=O)C(O)=O MUBZPKHOEPUJKR-UHFFFAOYSA-N 0.000 description 3
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- 229940041514 candida albicans extract Drugs 0.000 description 3
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- 230000008929 regeneration Effects 0.000 description 3
- 238000011069 regeneration method Methods 0.000 description 3
- 150000008163 sugars Chemical class 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000012138 yeast extract Substances 0.000 description 3
- HBGPNLPABVUVKZ-POTXQNELSA-N (1r,3as,4s,5ar,5br,7r,7ar,11ar,11br,13as,13br)-4,7-dihydroxy-3a,5a,5b,8,8,11a-hexamethyl-1-prop-1-en-2-yl-2,3,4,5,6,7,7a,10,11,11b,12,13,13a,13b-tetradecahydro-1h-cyclopenta[a]chrysen-9-one Chemical compound C([C@@]12C)CC(=O)C(C)(C)[C@@H]1[C@H](O)C[C@]([C@]1(C)C[C@@H]3O)(C)[C@@H]2CC[C@H]1[C@@H]1[C@]3(C)CC[C@H]1C(=C)C HBGPNLPABVUVKZ-POTXQNELSA-N 0.000 description 2
- PFRGGOIBYLYVKM-UHFFFAOYSA-N 15alpha-hydroxylup-20(29)-en-3-one Natural products CC(=C)C1CCC2(C)CC(O)C3(C)C(CCC4C5(C)CCC(=O)C(C)(C)C5CCC34C)C12 PFRGGOIBYLYVKM-UHFFFAOYSA-N 0.000 description 2
- RGHHSNMVTDWUBI-UHFFFAOYSA-N 4-hydroxybenzaldehyde Chemical compound OC1=CC=C(C=O)C=C1 RGHHSNMVTDWUBI-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 2
- 235000017491 Bambusa tulda Nutrition 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- 239000007836 KH2PO4 Substances 0.000 description 2
- 244000082204 Phyllostachys viridis Species 0.000 description 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 2
- 108010009736 Protein Hydrolysates Proteins 0.000 description 2
- SOKRNBGSNZXYIO-UHFFFAOYSA-N Resinone Natural products CC(=C)C1CCC2(C)C(O)CC3(C)C(CCC4C5(C)CCC(=O)C(C)(C)C5CCC34C)C12 SOKRNBGSNZXYIO-UHFFFAOYSA-N 0.000 description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 2
- 239000011425 bamboo Substances 0.000 description 2
- 238000010170 biological method Methods 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000004587 chromatography analysis Methods 0.000 description 2
- 238000012258 culturing Methods 0.000 description 2
- 230000003247 decreasing effect Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- HYBBIBNJHNGZAN-UHFFFAOYSA-N furfural Chemical compound O=CC1=CC=CO1 HYBBIBNJHNGZAN-UHFFFAOYSA-N 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 230000002401 inhibitory effect Effects 0.000 description 2
- JVTAAEKCZFNVCJ-UHFFFAOYSA-N lactic acid Chemical compound CC(O)C(O)=O JVTAAEKCZFNVCJ-UHFFFAOYSA-N 0.000 description 2
- 229910000402 monopotassium phosphate Inorganic materials 0.000 description 2
- 238000006386 neutralization reaction Methods 0.000 description 2
- 239000011368 organic material Substances 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 229920002223 polystyrene Polymers 0.000 description 2
- GNSKLFRGEWLPPA-UHFFFAOYSA-M potassium dihydrogen phosphate Chemical compound [K+].OP(O)([O-])=O GNSKLFRGEWLPPA-UHFFFAOYSA-M 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000006722 reduction reaction Methods 0.000 description 2
- 230000001105 regulatory effect Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 239000010902 straw Substances 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- QTBSBXVTEAMEQO-UHFFFAOYSA-M Acetate Chemical compound CC([O-])=O QTBSBXVTEAMEQO-UHFFFAOYSA-M 0.000 description 1
- 235000018185 Betula X alpestris Nutrition 0.000 description 1
- 235000018212 Betula X uliginosa Nutrition 0.000 description 1
- 239000004484 Briquette Substances 0.000 description 1
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 241000222120 Candida <Saccharomycetales> Species 0.000 description 1
- 241000222178 Candida tropicalis Species 0.000 description 1
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 244000068988 Glycine max Species 0.000 description 1
- 235000010469 Glycine max Nutrition 0.000 description 1
- COLNVLDHVKWLRT-QMMMGPOBSA-N L-phenylalanine Chemical compound OC(=O)[C@@H](N)CC1=CC=CC=C1 COLNVLDHVKWLRT-QMMMGPOBSA-N 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 230000003213 activating effect Effects 0.000 description 1
- 239000002154 agricultural waste Substances 0.000 description 1
- PYMYPHUHKUWMLA-VPENINKCSA-N aldehydo-D-xylose Chemical compound OC[C@@H](O)[C@H](O)[C@@H](O)C=O PYMYPHUHKUWMLA-VPENINKCSA-N 0.000 description 1
- 150000001413 amino acids Chemical class 0.000 description 1
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 239000004202 carbamide Substances 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 239000001913 cellulose Substances 0.000 description 1
- 229920002678 cellulose Polymers 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000002860 competitive effect Effects 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000004459 forage Substances 0.000 description 1
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- 239000000446 fuel Substances 0.000 description 1
- 229930182830 galactose Natural products 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-M hydroxide Chemical compound [OH-] XLYOFNOQVPJJNP-UHFFFAOYSA-M 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 239000004310 lactic acid Substances 0.000 description 1
- 235000014655 lactic acid Nutrition 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 239000003077 lignite Substances 0.000 description 1
- WRUGWIBCXHJTDG-UHFFFAOYSA-L magnesium sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Mg+2].[O-]S([O-])(=O)=O WRUGWIBCXHJTDG-UHFFFAOYSA-L 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 150000007524 organic acids Chemical class 0.000 description 1
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- 235000006408 oxalic acid Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- COLNVLDHVKWLRT-UHFFFAOYSA-N phenylalanine Natural products OC(=O)C(N)CC1=CC=CC=C1 COLNVLDHVKWLRT-UHFFFAOYSA-N 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000002203 pretreatment Methods 0.000 description 1
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- 239000010907 stover Substances 0.000 description 1
- 235000012141 vanillin Nutrition 0.000 description 1
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- 238000005406 washing Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
- C12P7/18—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic polyhydric
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L27/00—Spices; Flavouring agents or condiments; Artificial sweetening agents; Table salts; Dietetic salt substitutes; Preparation or treatment thereof
- A23L27/30—Artificial sweetening agents
- A23L27/33—Artificial sweetening agents containing sugars or derivatives
- A23L27/34—Sugar alcohols
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23L—FOODS, FOODSTUFFS, OR NON-ALCOHOLIC BEVERAGES, NOT COVERED BY SUBCLASSES A21D OR A23B-A23J; THEIR PREPARATION OR TREATMENT, e.g. COOKING, MODIFICATION OF NUTRITIVE QUALITIES, PHYSICAL TREATMENT; PRESERVATION OF FOODS OR FOODSTUFFS, IN GENERAL
- A23L29/00—Foods or foodstuffs containing additives; Preparation or treatment thereof
- A23L29/30—Foods or foodstuffs containing additives; Preparation or treatment thereof containing carbohydrate syrups; containing sugars; containing sugar alcohols, e.g. xylitol; containing starch hydrolysates, e.g. dextrin
- A23L29/37—Sugar alcohols
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/42—Electrodialysis; Electro-osmosis ; Electro-ultrafiltration; Membrane capacitive deionization
- B01D61/44—Ion-selective electrodialysis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/20—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising free carbon; comprising carbon obtained by carbonising processes
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/30—Active carbon
- C01B32/312—Preparation
- C01B32/318—Preparation characterised by the starting materials
- C01B32/324—Preparation characterised by the starting materials from waste materials, e.g. tyres or spent sulfite pulp liquor
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/02—Monosaccharides
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P7/00—Preparation of oxygen-containing organic compounds
- C12P7/02—Preparation of oxygen-containing organic compounds containing a hydroxy group
- C12P7/04—Preparation of oxygen-containing organic compounds containing a hydroxy group acyclic
- C12P7/06—Ethanol, i.e. non-beverage
- C12P7/08—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate
- C12P7/10—Ethanol, i.e. non-beverage produced as by-product or from waste or cellulosic material substrate substrate containing cellulosic material
-
- 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
-
- 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
-
- A—HUMAN NECESSITIES
- A23—FOODS OR FOODSTUFFS; TREATMENT THEREOF, NOT COVERED BY OTHER CLASSES
- A23V—INDEXING SCHEME RELATING TO FOODS, FOODSTUFFS OR NON-ALCOHOLIC BEVERAGES AND LACTIC OR PROPIONIC ACID BACTERIA USED IN FOODSTUFFS OR FOOD PREPARATION
- A23V2002/00—Food compositions, function of food ingredients or processes for food or foodstuffs
-
- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
-
- 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
-
- 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
- Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
Definitions
- the present invention relates to a method of producing xylitol using a hydrolysate containing xylose and arabinose prepared from a byproduct of a tropical fruit biomass. More precisely, the present invention relates to a method of producing xylitol which includes the steps of producing xylose and arabinose by the pretreatment of tropical fruit biomass byproduct including coconut shell, palm shell and oil palm empty fruit bunch (OPEFB), such as an acid (0.2-5%) hydrolysis and an electrodialysis (ED) and an ionic purification; and producing xylitol with high yield based on repeated batch fermentation using the hydrolysate containing the above xylose and arabinose as a carbon source.
- the present invention relates to an active carbon produced by carbonization and activation of the hydrolysis remainder of the tropical fruit shell, the byproduct of xylose and arabinose production, at a certain temperature and a preparation method of the same.
- Xylitol is industrially produced by a chemical reduction of hemicellulose hydrolysate prepared from plant materials such as birch and corncob, etc, or by a biological conversion of the hydrolysate using a microorganism.
- the chemical reduction not only is difficult to separate and purify xylitol or xylose from other hy- drolysates produced from hemicellulose and gives as low yield as 50 - 60% but also has risks of undergoing a reaction at high temperature and high pressure using alkali and waste problem.
- Biomass is a reusable organic material extracted from energy crops and trees, agricultural products and forage crops, agricultural wastes and remnants, forestry wastes and debris, water plants, animal excrements, municipal wastes and other various wastes. It also indicates organic components of wood, plants, agricultural forestry byproducts, municipal wastes and industrial wastes which have been used as an energy source.
- plants are composed of three mapr components of cellulose, hemicellulose and lignin and other minor resins. From the decomposition or conversion of such components, a renewable resource, which is fibrous hydrolysate having high xylose content can be prepared. During the xylose production, arabinose can also be additionally obtained. To separate or decompose the above mapr three components, bonds among them have to be first disrupted before the conversion.
- xylose has been produced by the steps of acid-hydrolysis of hemicellulose existing in wood, straw or corncob, decoloration, ion purification and crystallization.
- the hydrolysate obtained from the acid-hydrolysis contains xylose, arabinose and a large amount of inorganic ions, so that purification process is required to eliminate such inorganic ions.
- the purification of usable sugar components including xylose from the hydrolysate has been generally performed by the following processes.
- a neutralizing agent is added to the hydrolysate of acid-hydrolysis to adjust pH to 3.0 ⁇ 7.Ov to obtain a precipitate; the precipitated salt is separated by filtering; color materials are eliminated by using charcoal; then the hydrolysate proceeds to ion exchange resin tower filled with cation exchange resin, anion exchange resin and mixed resin in that order, resulting in the separation of usable ingredients including xylose from the hydrolysate.
- ED electrolytic ED
- electrolysis is a purification method to eliminate impurities included in the reaction solution such as colloid using direct current voltage.
- an ion-exchange membrane is generally used.
- an organic material can be burned because of carbon (C) therein, and any substance can be used as a raw material for the production of the active carbon as long as it can be burned.
- Representative raw materials for the production of active carbon are wood, lignite and anthracite, etc, and active carbon is produced by carbonizing them to charcoal.
- the charcoal is mainly composed of carbon resulted from the incomplete oxidation during carbonization of wood, and the charcoal varies from the kind of wood and temperature of burning.
- the mapr wood materials for charcoal are exemplified by an oak, a bamboo, a broadleaf tree, a palm tree, a coconut, etc, and particularly the charcoal made by an oak has been known to have better treatment effect on water purification, cleaning, fuel and garden plants, compared with other charcoal produced from a broadleaf tree, a bamboo, a palm tree or a coconut.
- the two most important processes for the production of an active carbon are the carbonization process and activation process.
- the carbonization process indicates the procedure in which a raw material is heated at 500 ⁇ 700 0 C, leading to dehydration and deoxidation, and then the surface oxygen is released as the forms of water, carbon monoxide and carbon dioxide, suggesting that all the volatile ingredients are eliminated and fixed carbon is left alone.
- the activation process indicates the oxidation reaction of carbon occurring at 800 ⁇ 1,000 0 C, in which the surface of a carbide is eroded and thereby micropore structure is developed in the carbide.
- the present invention provides a method for preparing the hydrolysate containing xylose and arabinose, comprising the steps of acid-hydrolyzing the byproducts of tropical fruit biomass such as coconut shell, palm shell and OPEFB (Oil Palm Empty Fruit Bunch); obtaining the hydrolysate containing xylose and arabinose by the above acid-hydrolysis; and separating and purifying the hydrolysate by electrodialysis.
- tropical fruit biomass such as coconut shell, palm shell and OPEFB (Oil Palm Empty Fruit Bunch)
- the present invention also provides a method for preparing xylitol, comprising the steps of adapting xylitol fermenting microorganism to the hydrolysate containing xylose and arabinose; and inoculating and fermenting the microorganism in the culture medium containing the hydrolysate as a carbon source.
- the present invention further provides a method for preparing an active carbon by carbonization and activation of the hydrolysis remainder of the tropical fruit shell such as coconut shell and palm shell, the byproduct of xylose and arabinose production.
- the present invention provides a method for preparing the hydrolysate containing xylose and arabinose, comprising the steps of acid-hydrolyzing the byproducts of tropical fruit biomass such as coconut shell, palm shell and OPEFB (Oil Palm Empty Fruit Bunch); obtaining the hydrolysate containing xylose and arabinose by the above acid-hydrolysis; and separating and purifying the hydrolysate by electrodialysis.
- tropical fruit biomass such as coconut shell, palm shell and OPEFB (Oil Palm Empty Fruit Bunch)
- the byproducts of tropical fruit biomass of the present invention which are coconut shell, palm shell and EFB (Empty Fruit Bunch), are pulverized into 0.5 ⁇ 5 cm 2 in average surface area or 0.1 ⁇ 5 cm in average length, followed by drying at 40 ⁇ 8O 0 C for 12 ⁇ 24 hours.
- Acid-hydrolysis is induced by the following steps; 100 ⁇ 1,000 g of 0.2 ⁇ 5.0 % sulfuric acid solution is added to 100 g of the dried coconut shell, palm shell or OPEFB (Oil Palm Empty Fruit Bunch) to make a mixture of a solvent and the biomass for acid-hydrolysis at the ratio of 1 : 1 ⁇ 1 : 20; and the mixture is reacted by stirring at 100 ⁇ 200 0 C, 10 ⁇ 50 rpm under the reaction pressure of 0 ⁇ 10 kgf/ ⁇ n 2 for 0.5 ⁇ 10 hours.
- OPEFB Oil Palm Empty Fruit Bunch
- the electrodialysis apparatus preferably includes the ion exchange membrane, the electrode plate, the flow control pump and the rectifier.
- the desalinated reaction solution is vacuun-concentrated with the sugar concentration of 25 ⁇ 45 Brix, followed by decoloration using a granular activated carbon.
- the decoloration is preferably performed at 79 ⁇ 8O 0 C at linear velocity (LV) of 1 ⁇ 3 m/hr.
- the decolored reaction solution proceeds to a strong acid cation exchange resin, a weak alkali anion exchange resin and a mixed resin one after another to eliminate inorganic salts and ionic substances.
- a strong acid cation exchange resin a weak alkali anion exchange resin
- a mixed resin one after another to eliminate inorganic salts and ionic substances.
- the hydrolysate containing xylose as a mapr component a small amount of arabinose and other monosaccharides (up to 5%) is prepared.
- the ion exchange membrane herein is preferably composed of a cation membrane and an anion membrane.
- the present invention also provides a method for preparing xylitol, comprising the steps of adapting xylitol fermenting microorganism to the hydrolysate containing xylose and arabinose; and inoculating and fermenting the microorganism in the culture medium containing the hydrolysate as a carbon source.
- the hydrolysate of the present invention is obtained by the method described hereinbefore, which is added to the microorganism culture medium for the production of xylitol after being through separate pre-treatment processes (neutralization, filtering, and purification using an ion exchange resin).
- the culture maximn for fermentation is preferably the one that contains a complex nitrogen source such as yeast extract, malt extract and soybean cake, KH 2 PO 4 , and MgSO 4 .7H 2 O.
- the xylitol fermenting microorganism of the invention is not limited to a specific one and any microorganism that is able to ferment xylitol is accepted.
- Candida tropicalis CJ-FID and its mutants are preferably used (Korean Patent Publication No. 2005-0025059).
- the xylitol fermenting microorganism of the invention is characteristically adapted to the hydrolysate by culturing in the mediun containing the hydrolysate for a long time enough for 10 - 30 generation growth. It is preferred to increase conversion yield of xylitol by using the xylitol fermenting microorganism adapted to the hydrolysate by 20 sub-cultures. As shown in Fig. 1, adequate nunbers of sub-culture, in order to increase the yield of xylitol by adapting the xylitol fermenting microorganism to the hydrolysate, is 20 times. Even if the sub-culture is continued farther than 20 times, the yield of xylitol is not increased. Thus, 20 times of sub-culture would be proper and economical.
- the maximn for sub-culture herein can be any conventional culture medium containing the hydrolysate.
- Fermentation herein is carried out by batch type fermentation and repeated batch type fermentation in which a required amount of xylose hydrolysate is loaded in a single fermentor and then when the xylose is all consuned the fermentation is terminated.
- a microorganism that can ferment xylitol is inoculated into a culture mediun and cultured in a vacuumed microfiltration bioreactor.
- Culture solution is obtained and the medium is serially loaded in the bioreactor.
- the collected culture solution is separated into cells and remaining solution by using microfiltration system using vacuum pressure or a centrifuge.
- the microfiltration system using vacuum pressure is preferred for the efficient use of the automation system.
- the microfiltration system using vacuun pressure can be either separately established or equipped into the bioreactor.
- the separated cells are concentrated to 30 ⁇ 70g/l, re-inoculated, and re-circulated in the bioreactor, followed by culture using the hydrolysate as a carbon source. Then, xylitol is recovered from the remaining culture solution separated above.
- the present invention further provides a method for preparing an active carbon by carbonization and activation of the hydrolysis remainder such as coconut shell or palm shell, the byproducts generated from the preparation process of the hydrolysate containing xylose and arabinose resulted from the acid-hydrolysis of the byproducts of tropical fruit biomass such as coconut shell and palm shell.
- the hydrolysate containing xylose and arabinose is separated by acid-hydrolysis and the remaining byproducts of tropical fruit biomass such as coconut shell and palm shell are hydrolyzed and the byproducts therefrom are used as the raw material for the active carbon, which were carbonized at 500 ⁇ 1,000 0 C for 72 - 168 hours and activated to prepare a gas-absorbing active carbon with high purity.
- the carbon purity of the hydrolysis remainder is increased during the extraction process, the ash content is decreased.
- a high quality active carbon such as a high purity gas-absorbing active carbon can be prepared due to the development of micropore production method.
- the active carbon of the invention has excellent gas-absorbing capacity, compared with the conventional active carbon produced from coconut shell or palm shell not been through acid-hydrolysis (see Table 6).
- Fig. 1 is a graph illustrating the changes of conversion yield (•) over the nunbers of sub-culture.
- Fig. 2 is a graph illustrating the changes of cell density (•), xylose ( ⁇ ) and xylitol
- Fig. 3 is a graph illustrating the changes of cell density (•), xylose ( ⁇ ) and xylitol
- Acid-hydrolysis was performed by the following steps; 100 ⁇ 1,000 g of 0.2 ⁇ 5.0% sulfuric acid solution was added to 100 g of the dried coconut shell, palm shell or OPEFB to make a mixture of the biomass and a solvent for acid-hydrolysis at the ratio of 1 : 1 ⁇ 1 : 20; and the mixture was reacted by stirring at 100 ⁇ 200 0 C, 10 ⁇ 50 rpm under the reaction pressure of 0 ⁇ 10 kgf/cm 2 for 0.5 ⁇ 10 hours.
- Sugar compositions according to the extraction time are shown in Table 1.
- the desalinated reaction solution was vacuun-concentrated with the sugar concentration of 25 ⁇ 45 Brix, followed by decoloration using a granular activated carbon. At this time, the decoloration was preferably performed at 79 ⁇ 8O 0 C at linear velocity (LV) of 1 ⁇ 3m/hr.
- Example 4 Sugar compositions of the hydrolvsates containing monosaccharides, xylose and arabinose [73] The sugar compositions of the hydrolysates containing monosaccharides, xylose and arabinose obtained in examples 1 - 3 and comparative example 1 were investigated and the results are shown in Table 4
- Example 6 Components and contents of the hydrolysis remainders after car- bonization and activation
- carbon was oxidized at 800 - 1,000 0 C to induce surface erosion and to form a micropore structure.
- An active carbon was produced using coconut shell and palm shell which had not been through the acid-hydrolysis.
- an active carbon prepared by gas (vapor, carbon dioxide, air, etc) activation was used as a control. Then the components and contents were examined. The results are shown in Table 6. As shown in Table 6, the active carbon prepared from the hydrolysis remainder of coconut shell and palm shell, the byproducts of tropical fruit biomass, exhibited excellent gas absorption, compared with the control.
- Example 7 Batch type fermentation using the hvdrolvsate containing 20Qg/L of
- the hydrolysate contains furfural, 5-hydroxymethyl (HMF), acetate, hydroxyben- zaldehyde (HBA) and vanillin having a microorganism growth inhibiting activity.
- HMF 5-hydroxymethyl
- HBA hydroxyben- zaldehyde
- vanillin having a microorganism growth inhibiting activity.
- the best xylose conversion rate was 58%.
- the present inventors adapted the xylitol fermenting microorganism through 20 times of sub-culture on the solid medium comprising the hydrolysate containing 20% of xylose as a carbon source.
- Fig. 1 illustrates that the yield of xylitol was increased by adapting the microorganism to the inhibitor using the solid medium comprising the hydrolysate containing a microorganism growth inhibiting component as a carbon source.
- a preculture medium comprising 20g/L of glucose and 5g/L of yeast extract was prepared.
- Candida tropicalls CJ FID was inoculated into a 250ml flask containing 50ml of the medium, followed by preculture at 3O 0 C with 240rpm for 10 hours.
- a main culture maximn comprising the hydrolysate containing 200g/L of xylose, 5g/L of yeast extract, 5g/L urea, 5g/L KH 2 PO 4 , and MgSO 4 -H 2 O was prepared. 2L of the main culture maximn was added into a 5L fermentor, to which the microorganism was inoculated.
- the microorganism was shaking-cultured at 3O 0 C for 24hours (500 - 300rpm, l.Ovvm, pH 5.0).
- the changes of cell density (•), xylose ( ⁇ ) and xylitol (A) concentrations over the fermentation time are shown in Fig. 2.
- Example 8 Production of xylitol by repeated batch type fermentation [91] The microorganism was cultured in the same maximn as the one used in example 7 in a bioreactor. Just before xylose was all consuned, the culture solution where the reaction was terminated was transferred to microfiltration system using vacuun pressure attached to the bioreactor. The cells and the remaining reaction solution were separated and the isolated cells were concentrated. The concentrated cells were cultured in a bioreactor supplemented with 2L of a fresh medium. The culture conditions were same as described in Example 8.
- xylose and arabinose the functional sugars
- xylitol could also be prepared repeatedly with high yield from the xylose solution by the steps of preparing hydrolysate containing xylose and arabinose; culturing a microorganism using the hydrolysate as a carbon source; concentrating the cells by a vacuun microfiltration bioreactor; reusing the concentrated cells to prepare xylitol.
- high quality carbide could be prepared by carbonizing and activating the hydrolysis remainder produced during the production of xylose and arabinose and thereby waste treatment would be less difficult and waste treatment cost could be lowered.
- xylose and arabinose and further xylitol the competitive high value functional sugars, can be efficiently produced by using inexpensive biomass.
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Abstract
Disclosed is a method of producing xylitol using a hydrolysate containing xylose and arabinose prepared from byproducts of tropical fruit biomass and more precisely, a method of producing xylitol which includes the steps of producing xylose and arabinose by the pretreatment of tropical fruit biomass byproducts including coconut shell, palm shell and oil palm empty fruit bunch (OPEFB) via acid (0.2-5%) hydrolysis and an electrodialysis and an ionic purification; and producing xylitol with high yield based on repeated batch fermentation using a hydrolysate containing xylose and arabinose as a carbon source. In addition, the present invention relates to an active carbon produced by carbonization and activation of a hydrolysate remainder of a tropical fruit shell, the byproduct of xylose and arabinose production, at a certain temperature and a preparation method of the same.
Description
Description
METHOD OF PRODUCING XYLITOL USING HYDROL YSATE
CONTAINING XYLOSE AND ARABINOSE PREPARED FROM
BYPRODUCT OF TROPICAL FRUIT BIOMASS
Technical Field
[1] The present invention relates to a method of producing xylitol using a hydrolysate containing xylose and arabinose prepared from a byproduct of a tropical fruit biomass. More precisely, the present invention relates to a method of producing xylitol which includes the steps of producing xylose and arabinose by the pretreatment of tropical fruit biomass byproduct including coconut shell, palm shell and oil palm empty fruit bunch (OPEFB), such as an acid (0.2-5%) hydrolysis and an electrodialysis (ED) and an ionic purification; and producing xylitol with high yield based on repeated batch fermentation using the hydrolysate containing the above xylose and arabinose as a carbon source. In addition, the present invention relates to an active carbon produced by carbonization and activation of the hydrolysis remainder of the tropical fruit shell, the byproduct of xylose and arabinose production, at a certain temperature and a preparation method of the same. Background Art
[2] Xylitol is industrially produced by a chemical reduction of hemicellulose hydrolysate prepared from plant materials such as birch and corncob, etc, or by a biological conversion of the hydrolysate using a microorganism. The chemical reduction, however, not only is difficult to separate and purify xylitol or xylose from other hy- drolysates produced from hemicellulose and gives as low yield as 50 - 60% but also has risks of undergoing a reaction at high temperature and high pressure using alkali and waste problem.
[3] One of the alternative biological methods which are expected to have high price competitiveness compared with the conventional chemical methods is the attempt to produce xylitol using a renewable resource containing a required amount of sugar based on a biological procedure. Although this method is expected to reduce production costs and enables recycling of resources, there is still a long way to go to establish a method of producing xylitol using such a renewable resource based on a biological method. Studies are undergoing to develop a highly efficient sacchari- fication process using a fibrous biomass. But they are all focused on soft materials
such as a straw and a corn stover.
[4] Biomass is a reusable organic material extracted from energy crops and trees, agricultural products and forage crops, agricultural wastes and remnants, forestry wastes and debris, water plants, animal excrements, municipal wastes and other various wastes. It also indicates organic components of wood, plants, agricultural forestry byproducts, municipal wastes and industrial wastes which have been used as an energy source.
[5] Among many natural fibrous biomasses, plants (leaves, stems and roots) are composed of three mapr components of cellulose, hemicellulose and lignin and other minor resins. From the decomposition or conversion of such components, a renewable resource, which is fibrous hydrolysate having high xylose content can be prepared. During the xylose production, arabinose can also be additionally obtained. To separate or decompose the above mapr three components, bonds among them have to be first disrupted before the conversion.
[6] Up to date, xylose has been produced by the steps of acid-hydrolysis of hemicellulose existing in wood, straw or corncob, decoloration, ion purification and crystallization. The hydrolysate obtained from the acid-hydrolysis contains xylose, arabinose and a large amount of inorganic ions, so that purification process is required to eliminate such inorganic ions.
[7] The purification of usable sugar components including xylose from the hydrolysate has been generally performed by the following processes. A neutralizing agent is added to the hydrolysate of acid-hydrolysis to adjust pH to 3.0 ~ 7.Ov to obtain a precipitate; the precipitated salt is separated by filtering; color materials are eliminated by using charcoal; then the hydrolysate proceeds to ion exchange resin tower filled with cation exchange resin, anion exchange resin and mixed resin in that order, resulting in the separation of usable ingredients including xylose from the hydrolysate.
[8] In the above processes, all ions in the hydrolysate are attached on the ion exchange resin and acids and alkalis are passed through, resulting in the separation of ions and the recovery of the resin. The solution containing the usable sugar components purified from ion exchange resin tower proceeds to a separation tower filled with Na + type chromatography separation resin in the form of sulfated polystyrene cross-linked with divinylbenzene. As a result, the fraction with xylose in high content and the fraction having high arabinose content can be obtained. The fractionated xylose and arabinose are concentrated by Brix 60 ~ 80, followed by crystallization to give xylose crystals and arabinose crystals.
[9] In the purification process above, precipitation is induced by adding a chemical substance that is able for form an insoluble salt with the inorganic ion. And, the precipitated salt is separated by using a filter and as a result the salt concentration is reduced. However, salt residue remaining not-filtered can form a scale during the concentration, even though it is a small amount, resulting in the decrease of productivity. According to the method using an ion exchange resin, massive ion exchange resins are required to treat such samples that have high content of total ions. And large amount of acid/alkali solution is necessarily used for the regeneration of the ion exchange resin. Accordingly, waste water containing high content of salt increases with increasing the waste water treatment costs. Therefore, an alternative technology to reduce chemicals and waste water is strongly requested.
[10] Another exemplary purification method is ED (electrodialysis). ED is a purification method to eliminate impurities included in the reaction solution such as colloid using direct current voltage. At this time, an ion-exchange membrane is generally used.
[11] The conventional ED had an economical limitation in industrial applicability because this method requires high energy cost and an expensive ion exchange membrane. However, since 1980s, approximately 50 ion exchange membranes have been developed by many companies including Asahi Chemical, Asahi Glass and Tokuyama Co. of Japan and Ionics and Dupont of USA, reducing high economic costs. There are also many patent applications in relation of ED ( f Recovering method of organic acidsJ (Application No: 98-0053421), ^Production methods of lysine-HClJ (Application No: 98-0011107), ^Separation and purification methods for phenylalanine by electrodialysis J (Application No: 99-0001349), f Recovery method of lactic acid by electrodialysis process] (Application No: 00-0028758), f Method for purification of amino acid containing solutions by electro- dialysisJ (Application No: 02-7005661) , etc) .
[12] In general, an organic material can be burned because of carbon (C) therein, and any substance can be used as a raw material for the production of the active carbon as long as it can be burned. Representative raw materials for the production of active carbon are wood, lignite and anthracite, etc, and active carbon is produced by carbonizing them to charcoal. The charcoal is mainly composed of carbon resulted from the incomplete oxidation during carbonization of wood, and the charcoal varies from the kind of wood and temperature of burning. The mapr wood materials for charcoal are exemplified by an oak, a bamboo, a broadleaf tree, a palm tree, a coconut, etc, and particularly the charcoal made by an oak has been known to have better treatment effect
on water purification, cleaning, fuel and garden plants, compared with other charcoal produced from a broadleaf tree, a bamboo, a palm tree or a coconut.
[13] The two most important processes for the production of an active carbon are the carbonization process and activation process. The carbonization process indicates the procedure in which a raw material is heated at 500 ~ 7000C, leading to dehydration and deoxidation, and then the surface oxygen is released as the forms of water, carbon monoxide and carbon dioxide, suggesting that all the volatile ingredients are eliminated and fixed carbon is left alone. The activation process indicates the oxidation reaction of carbon occurring at 800 ~ 1,0000C, in which the surface of a carbide is eroded and thereby micropore structure is developed in the carbide.
[14] The patents regarding the production of charcoal using byproducts of tropical fruit biomass are exemplified by Korean Patent Publication No. 2002-0095809 (Coconut charcoal and manufacturing process of it), No. 2000-0055003 (Manufacturing process of yellow ocher charcoal), No. 10-2005-0003585 (Charcoal and manufacturing method thereof), No. 2000-0012825 (Manufacturing process of coconut shell charcoal briquette) and No. 10-2005-0031310 (Ignition coal using palm charcoal dust and manufacturing method thereof). As shown in the list, there are many reports regarding the method of preparing various pressing charcoals using palm charcoal dust as a mapr raw material, but there have been no reports on the preparation of a high value active carbon by extracting xylose from the byproducts of tropical fruit biomass to produce charcoal using the remainders.
[15] One problem of the conventional precipitation method is the reduced productivity owing to the scale formation. Another problem is the production of lots of waste water and the high price for the waste water treatment. Precisely, the inorganic salts and organic acids included in the hydrolysate of acid-hydrolysis resulted from the acid treatment can be eliminated by using an ion exchange resin because they have electrical charge, but to eliminate such ions rich in the hydrolysate, resin regeneration is required frequently and thereby massive acid/alkali waste water is generated. And the cost for the treatment of such waste water is very high. Disclosure of Invention Technical Problem
[16] It is an object of the present invention to provide a method for preparing the hydrolysate containing xylose and arabinose obtained by acid-hydrolysis, electrodialysis, ion purification and decoloration of a raw material, in order to efficiently use effective
ingredients including xylose in the byproducts of tropical fruit biomass such as coconut shell, palm shell and OPEFB, and to provide a method for producing xylitol from the above hydrolysate via microorganism fermentation.
[17] It is another object of the present invention to provide an active carbon produced by carbonization and activation of the hydrolysis remainder, the byproduct resulted from the above hydrolysate preparation process, and a preparation method of the same. Technical Solution
[18] The above objects and other objects of the present invention can be achieved by the following embodiments of the present invention.
[19] To achieve the objects of the invention, the present invention provides a method for preparing the hydrolysate containing xylose and arabinose, comprising the steps of acid-hydrolyzing the byproducts of tropical fruit biomass such as coconut shell, palm shell and OPEFB (Oil Palm Empty Fruit Bunch); obtaining the hydrolysate containing xylose and arabinose by the above acid-hydrolysis; and separating and purifying the hydrolysate by electrodialysis.
[20] The present invention also provides a method for preparing xylitol, comprising the steps of adapting xylitol fermenting microorganism to the hydrolysate containing xylose and arabinose; and inoculating and fermenting the microorganism in the culture medium containing the hydrolysate as a carbon source.
[21] The present invention further provides a method for preparing an active carbon by carbonization and activation of the hydrolysis remainder of the tropical fruit shell such as coconut shell and palm shell, the byproduct of xylose and arabinose production.
[22]
[23] The present invention is described in detail hereinafter.
[24] The present invention provides a method for preparing the hydrolysate containing xylose and arabinose, comprising the steps of acid-hydrolyzing the byproducts of tropical fruit biomass such as coconut shell, palm shell and OPEFB (Oil Palm Empty Fruit Bunch); obtaining the hydrolysate containing xylose and arabinose by the above acid-hydrolysis; and separating and purifying the hydrolysate by electrodialysis.
[25] The byproducts of tropical fruit biomass of the present invention, which are coconut shell, palm shell and EFB (Empty Fruit Bunch), are pulverized into 0.5 ~ 5 cm2 in average surface area or 0.1 ~ 5 cm in average length, followed by drying at 40 ~ 8O0C for 12 ~ 24 hours.
[26] Acid-hydrolysis is induced by the following steps; 100 ~ 1,000 g of 0.2 ~ 5.0 % sulfuric acid solution is added to 100 g of the dried coconut shell, palm shell or
OPEFB (Oil Palm Empty Fruit Bunch) to make a mixture of a solvent and the biomass for acid-hydrolysis at the ratio of 1 : 1 ~ 1 : 20; and the mixture is reacted by stirring at 100 ~ 2000C, 10 ~ 50 rpm under the reaction pressure of 0 ~ 10 kgf/αn 2 for 0.5 ~ 10 hours.
[27] To recover the soluble substances dissolved in the solution after the acid-hydrolysis, the precipitate is eliminated and pH of the hydrolysate is up-regulated from 1.0 ~ 2.0 to 3.0 ~ 7.0, followed by stirring at 60 ~ 9O0C for 30 ~ 120 minutes. Sulfate ion in the hydrolysate is reacted with calciun ion to precipitate as calcium sulfate. The hydrolysate is cooled down to under 3O0C using a heat exchanger. Calciun sulfate hydrated in the reaction solution is precipitated by using the difference of solubility over temperature. The precipitated calciun sulfate is eliminated by a filter cloth. The filtered reaction solution is desalinated with conductivity of up to 1,000 μS/cm by electrodialysis.
[28] In the above precipitation, however, non-precipitated remaining salts, even though they are a small amount, might form a scale during concentration process and reduce productivity. So, to overcome this problem, the present inventors introduced electro- dialysis. According to this electrodialysis, a scale that cause a problem is not formed, so that the productivity of xylose and arabinose is increased and the total amount of ions remaining in hydrolysis is reduced with reducing the repeated nunbers of resin regeneration necessary for the method using an ion exchange resin, resulting in the significant decrease of the use of acid/alkali solution. The production of xylose and arabinose via electrodialysis has advantages of reducing the amount of waste water and reducing production costs owing to the increase of productivity.
[29] The electrodialysis apparatus preferably includes the ion exchange membrane, the electrode plate, the flow control pump and the rectifier.
[30] The desalinated reaction solution is vacuun-concentrated with the sugar concentration of 25 ~ 45 Brix, followed by decoloration using a granular activated carbon. At this time, the decoloration is preferably performed at 79 ~ 8O0C at linear velocity (LV) of 1 ~ 3 m/hr.
[31] The decolored reaction solution proceeds to a strong acid cation exchange resin, a weak alkali anion exchange resin and a mixed resin one after another to eliminate inorganic salts and ionic substances. As a result, the hydrolysate containing xylose as a mapr component, a small amount of arabinose and other monosaccharides (up to 5%) is prepared. The ion exchange membrane herein is preferably composed of a cation membrane and an anion membrane.
[32] The present invention also provides a method for preparing xylitol, comprising the
steps of adapting xylitol fermenting microorganism to the hydrolysate containing xylose and arabinose; and inoculating and fermenting the microorganism in the culture medium containing the hydrolysate as a carbon source.
[33] The hydrolysate of the present invention is obtained by the method described hereinbefore, which is added to the microorganism culture medium for the production of xylitol after being through separate pre-treatment processes (neutralization, filtering, and purification using an ion exchange resin). The culture mediun for fermentation is preferably the one that contains a complex nitrogen source such as yeast extract, malt extract and soybean cake, KH2PO4, and MgSO4.7H2O.
[34] The xylitol fermenting microorganism of the invention is not limited to a specific one and any microorganism that is able to ferment xylitol is accepted. In this invention, Candida tropicalis CJ-FID and its mutants are preferably used (Korean Patent Publication No. 2005-0025059).
[35] The xylitol fermenting microorganism of the invention is characteristically adapted to the hydrolysate by culturing in the mediun containing the hydrolysate for a long time enough for 10 - 30 generation growth. It is preferred to increase conversion yield of xylitol by using the xylitol fermenting microorganism adapted to the hydrolysate by 20 sub-cultures. As shown in Fig. 1, adequate nunbers of sub-culture, in order to increase the yield of xylitol by adapting the xylitol fermenting microorganism to the hydrolysate, is 20 times. Even if the sub-culture is continued farther than 20 times, the yield of xylitol is not increased. Thus, 20 times of sub-culture would be proper and economical.
[36] The mediun for sub-culture herein can be any conventional culture medium containing the hydrolysate.
[37] Fermentation herein is carried out by batch type fermentation and repeated batch type fermentation in which a required amount of xylose hydrolysate is loaded in a single fermentor and then when the xylose is all consuned the fermentation is terminated.
[38] According to the repeated batch type fermentation of the invention, a microorganism that can ferment xylitol is inoculated into a culture mediun and cultured in a vacuumed microfiltration bioreactor. Culture solution is obtained and the medium is serially loaded in the bioreactor. The collected culture solution is separated into cells and remaining solution by using microfiltration system using vacuum pressure or a centrifuge. The microfiltration system using vacuum pressure is preferred for the efficient use of the automation system. The microfiltration system using vacuun
pressure can be either separately established or equipped into the bioreactor. The separated cells are concentrated to 30 ~ 70g/l, re-inoculated, and re-circulated in the bioreactor, followed by culture using the hydrolysate as a carbon source. Then, xylitol is recovered from the remaining culture solution separated above.
[39] When a microorganism is used, the productivity is just 2.0 ~ 3.0g/l-h and the cells are only possible for one-time use. But, when the microfiltration system using vacuum pressure is used, the cells are reusable without loss, no additional cost is required for washing and pre-culture process for repeated culture, compared with repeating batch type fermentation, and xylitol can be produced economically with high yield owing to the high density culture.
[40] The present invention further provides a method for preparing an active carbon by carbonization and activation of the hydrolysis remainder such as coconut shell or palm shell, the byproducts generated from the preparation process of the hydrolysate containing xylose and arabinose resulted from the acid-hydrolysis of the byproducts of tropical fruit biomass such as coconut shell and palm shell.
[41] Precisely, according to the method for preparing an active carbon of the invention, the hydrolysate containing xylose and arabinose is separated by acid-hydrolysis and the remaining byproducts of tropical fruit biomass such as coconut shell and palm shell are hydrolyzed and the byproducts therefrom are used as the raw material for the active carbon, which were carbonized at 500 ~ 1,0000C for 72 - 168 hours and activated to prepare a gas-absorbing active carbon with high purity.
[42] The carbon purity of the hydrolysis remainder is increased during the extraction process, the ash content is decreased. Using the hydrolysis remainder, a high quality active carbon such as a high purity gas-absorbing active carbon can be prepared due to the development of micropore production method.
[43] To produce the gas-absorbing active carbon with high purity, the acid-hydrolysis remainders are collected, dried at 40 ~ 1000C for 24 ~ 48 hours, and carbonized and activated at 500 ~ 1,0000C for 72 - 168 hours.
[44] The active carbon of the invention has excellent gas-absorbing capacity, compared with the conventional active carbon produced from coconut shell or palm shell not been through acid-hydrolysis (see Table 6). Brief Description of the Drawings
[45] The application of the preferred embodiments of the present invention is best understood with reference to the accompanying drawings, wherein:
[46]
[47] Fig. 1 is a graph illustrating the changes of conversion yield (•) over the nunbers of sub-culture.
[48] Fig. 2 is a graph illustrating the changes of cell density (•), xylose (■) and xylitol
(A) concentrations over the fermentation time according to batch type fermentation.
[49] Fig. 3 is a graph illustrating the changes of cell density (•), xylose (■) and xylitol
(A) concentrations over fermentation time according to repeated batch type fermentation. Best Mode for Carrying Out the Invention
[50] Practical and presently preferred embodiments of the present invention are illustrative as shown in the following Examples.
[51] However, it will be appreciated that those skilled in the art, on consideration of this disclosure, may make modifications and improvements within the spirit and scope of the present invention.
[52]
[53] Example 1 : Preparation of xylose and arabinose
[54] Coconut shell, palm shell and OPEFB, the byproducts of tropical fruit biomass, were pulverized into 0.5 ~ 5 cm2 in average area or 0.1 ~ 5 cm in average length, and dried at 40 ~ 8O0C for 12 ~ 24 hours.
[55] Acid-hydrolysis was performed by the following steps; 100 ~ 1,000 g of 0.2 ~ 5.0% sulfuric acid solution was added to 100 g of the dried coconut shell, palm shell or OPEFB to make a mixture of the biomass and a solvent for acid-hydrolysis at the ratio of 1 : 1 ~ 1 : 20; and the mixture was reacted by stirring at 100 ~ 2000C, 10 ~ 50 rpm under the reaction pressure of 0 ~ 10 kgf/cm2 for 0.5 ~ 10 hours. Sugar compositions according to the extraction time are shown in Table 1.
[56] Table 1
[Table 1]
# Giu (glucose), XyI (xylose), Ara (arabinose), Gal (galactose)
[57] To recover the soluble substances dissolved in the solution after the acid-hydrolysis, the precipitate was eliminated and pH of the hydrolysate was up-regulated from 1.0 ~ 2.0 to 3.0 ~ 7.0, followed by stirring at 60 ~ 9O0C for 30 ~ 120 minutes. Sulfate ion in the hydrolysate was reacted with calcium ion to precipitate as calcium sulfate. The hydrolysate was cooled down to under 3O0C using a heat exchanger. Calcium sulfate hydrated in the reaction solution was precipitated by using the difference of solubility over temperature. The precipitated calcium sulfate was eliminated by a filter press (0.5//M). The filtered reaction solution was desalinated with conductivity of up to l,000μS/cm by electrodialysis. The concentrations of xylose and arabinose and conductivities before and after electrodialysis were measured and shown in Table 2.
[58] Table 2
[Table 2]
Concentrations of xylose and arabinose and conductivities before and after electrodialysis
# XyI (xylose), Ara (arabinose), Cond. (conductivity)
[59] The desalinated reaction solution was vacuun-concentrated with the sugar concentration of 25 ~ 45 Brix, followed by decoloration using a granular activated carbon. At this time, the decoloration was preferably performed at 79 ~ 8O0C at linear velocity (LV) of 1 ~ 3m/hr.
[60] The decolored reaction solution proceeded to a strong acid cation exchange resin, a weak alkali anion exchange resin and a mixed resin one after another to eliminate inorganic salts and ionic substances. As a result, the hydrolysate containing xylose as a mapr component, a small amount of arabinose and other monosaccharides (up to 5%) was obtained.
[61] The hydrolysate containing useful sugars proceeded to a separation tower filled with
Na+ type chromatography separation resin in the form of sulfated polystyrene in which divinylbenzene is cross-linked. As a result, the fraction having high xylose content and the fraction having high arabinose content were obtained. The fractionated xylose and arabinose were concentrated by Brix 60 ~ 80, followed by crystallization to obtain xylose crystals and arabinose crystals. The yields and purity of the obtained xylose and arabinose are shown in Table 3.
[62]
[63] Example 2: Preparation of xylose and arabinose (using different hydrolase)
[64] An experiment was performed by the same manner as described in example 1 except that the acid treatment was performed with 0.2 - 5.0% HCl solution instead of 0.2 5.0% sulfuric acid solution. The yields and purity of the obtained xylose and arabinose are shown in Table 3.
[65]
[66] Example 3: Preparation of xylose and arabinose (using different hydrolase)
[67] An experiment was performed by the same manner as described in example 1 except that the acid treatment was performed with 0.2 - 5.0% oxalic acid solution instead of 0.2 - 5.0% sulfuric acid solution. The yields and purity of the obtained xylose and arabinose are shown in Table 3.
[68]
[69] Comparative Example 1: Preparation of xylose and arabinose (using different hydrolase)
[70] An experiment was performed by the same manner as described in example 1 except that alkali treatment was performed by 0.2 - 5.0% sodiun hydroxide solution instead of acid treatment with 0.2 - 5.0% sulfuric acid solution and neutralization was induced by using HCl until pH reached 5.0 - 70. The yields and purity of the obtained xylose
and arabinose are shown in Table 3.
[71] Table 3 [Table 3]
Yields and purity of the obtained xylose and arabinose (%)
[72] Example 4: Sugar compositions of the hydrolvsates containing monosaccharides, xylose and arabinose [73] The sugar compositions of the hydrolysates containing monosaccharides, xylose and arabinose obtained in examples 1 - 3 and comparative example 1 were investigated and the results are shown in Table 4
[74] Table 4
[Table 4]
Sugar compositions of the hydrolysates containing monosaccharides, xylose and arabinose
[75] From the above results, it was confirmed that xylose crystals with at least 85% yield and 98% purity and arabinose crystals with at least 80% yield and 98% purity were produced by desalination using an ion exchange resin and crystallization according to the method of example 1.
[76] [77] Example 5: Components and contents of the hydrolysis remainders after carbonization
[78] The hydrolysis remainders, the byproducts resulted from the production of xylose and arabinose in examples 1 - 3 and comparative example 1 were dried at 40 - 1000C for 24 - 48 hours, followed by carbonization at 500 - 7000C for 72 - 168 hours (for 10 kg of the remainder) and then the components and contents were examined. Coconut shell and palm shell without acid-hydrolysis were used for the control and the components and contents of the control were also examined and shown in Table 5. As shown in Table 5, the carbon yield and fixed carbon were increased in experimental
groups, compared with the control, but the ash content was reduced.
[79] Table 5 [Table 5]
Components and contents of the hydrolysis remainders after carbonization
[80] Example 6: Components and contents of the hydrolysis remainders after car- bonization and activation [81] After carbonization of the hydrolysis remainders, which were the byproducts generated from the production of xylose and arabinose in Example 5, carbon was oxidized at 800 - 1,0000C to induce surface erosion and to form a micropore structure. An active carbon was produced using coconut shell and palm shell which had not been through the acid-hydrolysis. And an active carbon prepared by gas (vapor, carbon dioxide, air, etc) activation was used as a control. Then the components and contents were examined. The results are shown in Table 6. As shown in Table 6, the active carbon prepared from the hydrolysis remainder of coconut shell and palm shell, the byproducts of tropical fruit biomass, exhibited excellent gas absorption, compared with the control.
[82] Table 6
[Table 6]
Components and contents of the hydrolysis remainders after carbonization and activation
[83] Example 7: Batch type fermentation using the hvdrolvsate containing 20Qg/L of
[84] The hydrolysate contains furfural, 5-hydroxymethyl (HMF), acetate, hydroxyben- zaldehyde (HBA) and vanillin having a microorganism growth inhibiting activity. Up to date, the best xylose conversion rate was 58%. To enhance the growth of a microorganism and to improve the yield of xylitol, the present inventors adapted the xylitol fermenting microorganism through 20 times of sub-culture on the solid medium comprising the hydrolysate containing 20% of xylose as a carbon source.
[85] According to the above method, the yield of xylitol was increased up to 80% (Fig. 1).
Fig. 1 illustrates that the yield of xylitol was increased by adapting the microorganism to the inhibitor using the solid medium comprising the hydrolysate containing a microorganism growth inhibiting component as a carbon source.
[86] First, a preculture medium comprising 20g/L of glucose and 5g/L of yeast extract was prepared. Candida tropicalls CJ FID was inoculated into a 250ml flask containing 50ml of the medium, followed by preculture at 3O0C with 240rpm for 10 hours.
[87] Then, a main culture mediun comprising the hydrolysate containing 200g/L of xylose, 5g/L of yeast extract, 5g/L urea, 5g/L KH2PO4, and MgSO4-H2O was prepared. 2L of the main culture mediun was added into a 5L fermentor, to which the microorganism was inoculated. The microorganism was shaking-cultured at 3O0C for 24hours (500 - 300rpm, l.Ovvm, pH 5.0). The changes of cell density (•), xylose (■) and xylitol (A) concentrations over the fermentation time are shown in Fig. 2.
[88] The yield of xylitol produced by the above method and the yield of xylitol produced from the purified xylitol powder were compared and the result is shown in Table 7. As shown in Table 7, the obtained xylitol concentration was 161g/L, cell concentration was 16.5g/L and the yield of xylitol was 80%. In the meantime, when the purified xylitol powder was used for the production of xylitol, the yield was slightly decreased and the production time was prolonged. When the hydrolysate was used instead of the purified xylose (same microorganism was used), purification process can be omitted and thus xylitol can be prepared much more economically.
[89] Table 7 [Table 7]
[90] Example 8: Production of xylitol by repeated batch type fermentation [91] The microorganism was cultured in the same mediun as the one used in example 7 in a bioreactor. Just before xylose was all consuned, the culture solution where the reaction was terminated was transferred to microfiltration system using vacuun pressure attached to the bioreactor. The cells and the remaining reaction solution were separated and the isolated cells were concentrated. The concentrated cells were cultured in a bioreactor supplemented with 2L of a fresh medium. The culture conditions were same as described in Example 8.
[92] 322g of xylitol was produced from the first 2L of culture solution which was not
filtered by the microfiltration system (productivity: 2.98g/l-h, xylitol yield from xylose: 80%). In the mean time, l,415g of xylitol was produced from the 8L of the next culture solution filtered by the microfiltration system (productivity: 7.86g/l-h, xylitol yield from xylose: 88.4%). The changes of cell density (•), xylose (■) and xylitol (A) concentrations over the fermentation time are shown in Fig. 2. Industrial Applicability
[93] In the present invention, the inventors confirmed that xylose and arabinose, the functional sugars, could be efficiently prepared from tropical fruit shell biomass by electrodialysis. The inventors also confirmed that xylitol could also be prepared repeatedly with high yield from the xylose solution by the steps of preparing hydrolysate containing xylose and arabinose; culturing a microorganism using the hydrolysate as a carbon source; concentrating the cells by a vacuun microfiltration bioreactor; reusing the concentrated cells to prepare xylitol. In addition, the inventors also confirmed that high quality carbide could be prepared by carbonizing and activating the hydrolysis remainder produced during the production of xylose and arabinose and thereby waste treatment would be less difficult and waste treatment cost could be lowered.
[94] Therefore, according to the present invention, xylose and arabinose and further xylitol, the competitive high value functional sugars, can be efficiently produced by using inexpensive biomass.
[95]
[96] Those skilled in the art will appreciate that the conceptions and specific embodiments disclosed in the foregoing description may be readily utilized as a basis for modifying or designing other embodiments for carrying out the same purposes of the present invention. Those skilled in the art will also appreciate that such equivalent embodiments do not depart from the spirit and scope of the invention as set forth in the appended claims.
Claims
[1] A method of preparing a hydrolysate containing xylose and arabinose, comprising the following steps: acid-hydrolyzing a byproduct of tropical fruit biomass; obtaining a hydrolysate containing xylose and arabinose by the acid-hydrolysis; and separating and purifying the hydrolysate by electrodialysis.
[2] The method for preparing a hydrolysate according to claim 1, wherein the byproduct of tropical fruit biomass is coconut shell, palm shell or oil palm empty fruit bunch (OPEFB).
[3] The method for preparing a hydrolysate according to claim 1, wherein the acid- hydrolysis is performed at the acid concentration of 0.2 - 5%, at the temperature of 100 - 2000C for 30 minutes - 10 hours.
[4] The method for preparing a hydrolysate according to claim 1, wherein the electrodialysis is carried out is using an electrodialysis apparatus composing of an ion exchange membrane, an electrode plate, a flow control pump and a rectifier.
[5] The method for preparing a hydrolysate according to claim 4, wherein the ion exchange membrane is composed of a cation membrane and an anion membrane.
[6] The method for preparing a hydrolysate according to claim 1, wherein the step of separating and purifying is performed by a precipitation before the electrodialysis and an ion exchange after the electrodialysis.
[7] A method for preparing an active carbon comprising the step of carbonization and activation of a residue of a hydrolysate prepared by an acid-hydrolysis of a tropical fruit shell at 500 - 1,0000C for 72 - 168hours.
[8] The method for preparing an active carbon according to claim 7, wherein the tropical fruit shell is a coconut shell or a palm shell.
[9] An active carbon prepared by the method of claim 7.
[10] A method of preparing xylitol comprising the step of fermenting the hydrolysate according to any one of claims 1 - 6.
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JP2008557221A JP4792509B2 (en) | 2007-02-09 | 2008-01-25 | Method for producing xylitol using hydrolyzed saccharified solution containing xylose and arabinose produced from tropical fruit biomass by-products |
EP08704950.8A EP2118294B1 (en) | 2007-02-09 | 2008-01-25 | Method of producing xylitol using hydrolysate containing xylose and arabinose prepared from byproduct of tropical fruit biomass |
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US10519522B2 (en) | 2014-10-31 | 2019-12-31 | Centralesupelec | Method for purifying oses without adjusting pH |
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Also Published As
Publication number | Publication date |
---|---|
EP2118294B1 (en) | 2019-10-09 |
US20100068121A1 (en) | 2010-03-18 |
EP2118294A4 (en) | 2012-01-25 |
BRPI0800097B1 (en) | 2018-02-06 |
CN101326973A (en) | 2008-12-24 |
KR20080074687A (en) | 2008-08-13 |
BRPI0800097A (en) | 2008-09-23 |
EP2118294A1 (en) | 2009-11-18 |
JP2009520504A (en) | 2009-05-28 |
CN101326973B (en) | 2013-02-27 |
KR101108789B1 (en) | 2012-03-13 |
MY150754A (en) | 2014-02-28 |
US8283139B2 (en) | 2012-10-09 |
JP4792509B2 (en) | 2011-10-12 |
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