CN1058996C - Improved technology for extracting xylose from corncob - Google Patents
Improved technology for extracting xylose from corncob Download PDFInfo
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- CN1058996C CN1058996C CN96105693A CN96105693A CN1058996C CN 1058996 C CN1058996 C CN 1058996C CN 96105693 A CN96105693 A CN 96105693A CN 96105693 A CN96105693 A CN 96105693A CN 1058996 C CN1058996 C CN 1058996C
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- hydrolysis
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Abstract
The present invention relates to an improved technology for extracting xylose from corncobs, which is composed of unit processes of pretreatment, hydrolysis, decoloring, concentration for crystallisation, etc., wherein the concentration of acid liquor in the processes of pretreatment and hydrolysis is respectively 0.07 to 0.1% and 0.7 to 0.8%, the temperature is respectively 105 DEG C and 120 DEG C, and the time is respectively one hour and three hours. The present invention eliminates the process of neutralization, simplifies the procedures, lowers energy consumption, produces xylose similar to pure products, and has the advantages of short periodicity of production, high rate of equipment utilization and safe operation.
Description
The present invention relates to a kind of xylose production method, specifically a kind of improving one's methods by corn cob extraction wood sugar.
Wood sugar is the aldose (CH of five carbon atoms
2OH (CHOH)
3CHO), white crystalline powder, pleasantly sweet, 144 ℃ of fusing points, water-soluble.Wood sugar is mainly used in diabetic subject's sweeting agent as foodstuff additive, industrial be auxiliary agent in printing and dyeing and the curriery.
Wood sugar is present in corn cob, wood chip and the straw.The industrial preparation wood sugar is many to be extracted by the corn cob hydrolysis.
Extract wood sugar with corn cob and generally use acid hydrolysis.In the existing technology, giving and handling acid concentration is to handle 3 hours under 0.5%, 120 ℃ of condition; Acid concentration is hydrolysis 4 hours under 7%, 120～125 ℃ of conditions during hydrolysis.Because acid concentration is big, the temperature height, the time is long, thus separating obtained hydrolyzed solution acid big, color is dark, need can concentrate after neutralizing treatment, crystallization.
Corn cob still has a large amount of corn cob slags after hydrolysis, will discharge in still after the washing.In the existing technology, deslagging after Slagoff method is to use open steam to boost, this has not only wasted a large amount of energy, and warm sludge easily causes operator's scald accident.
Hydrolyzed solution after neutralization, decolouring are handled needs recrystallize after concentrating.In the existing technology, concentrate for twice all in concentration tank static condition of negative pressure down dehydration concentrate, dewatering for the first time to hydrolyzed solution concentration is 30% to drop into when above and continue in next concentration tank to dewater, and is to send crystallization in the crystallizer at 80% o'clock to concentration.Because material heated time in jar is long, so easily carbonization influences quality product.
The present invention is intended to improve this traditional technology, under the prerequisite of ensuring the quality of products, simplifies technology, reduces cost.
The present invention has carried out sufficient condition test to the principle of giving acid concentration in processing and hydrolysis two unit processes, three factors utilizations of temperature and time orthogonal design, and the condition that optimizes is succeedd aborning.
1, give processing: acid concentration: 0.07～0.1%, temperature: 105～110 ℃, the time: 1 hour;
2, hydrolysis: acid concentration: 0.7～0.8%, temperature: 120～125 ℃, the time: 2.5～3 hours.Corn cob slag after the washing uses pressurized air normal temperature lower dreg discharging.
3, concentrated, crystallization: concentrate the secondary that uses concentration tank and rotary film evaporator to combine and concentrate, in concentration tank, dewater under the condition of negative pressure for the first time, to hydrolyzed solution concentration is 20% can send into dehydration for the second time in the rotary film evaporator when above, directly enters crystallization in the crystallizer after the dehydration for the second time.
During the present invention has got rid of and operation, flow process is short.The normal temperature deslagging, both rapid safety has been saved a large amount of steams again.Owing to give and handling and the hydrolysis high-temperature time is short, concentrate with pressurized air deslagging, the secondary that selects concentration tank and rotating thin film steaming device to combine, its synthesis energy saving effect compares with having technology now among the present invention, and energy consumption will reduce more than 1/3rd.Material residence time in concentration process is short, has guaranteed the quality of product.Technology of the present invention is simple, energy consumption is low, and is with short production cycle, improved plant factor, and operational safety, ensures the quality of products.
Embodiment:
Getting 1 ton of corn cob pulverizes in the input hydrolytic decomposition pot of back.
1, gives processing: 5 tons of water are dropped in the hydrolytic decomposition pot, add 9～12.5 kilogram 40% the dilute sulphuric acid or 3.7～5.1 kilogram 98% the vitriol oil (acid strength is 0.07～0.1%) then, under 105～110 ℃ of conditions, handled 1 hour, cooling back venting acid solution.
2, hydrolysis: 2.5 tons of water are dropped in the hydrolytic decomposition pot, add 18～20 kilogram 98% the vitriol oil (acid strength is 0.7～0.8%) then, heat up, hydrolysis is 2.5～3 hours under 120～125 ℃ of conditions.Hydrolysis finishes the back and separates, and collects hydrolyzed solution.Washing corn cob slag, water lotion are waited to decolour with the hydrolyzed solution merging, and the back concentrates, crystallization.Add suitable quantity of water during deslagging earlier, airtight material mouth charges into pressurized air, at 0.2MPa condition lower dreg discharging.
3, condensing crystal: hydrolyzed solution after the decolouring drops in the concentration tank, dewaters under condition of negative pressure, sends into dehydration for the second time in the rotary film evaporator when hydrolyzed solution concentration reaches 20% when above, directly enters crystallization in the crystallizer after dewatering for the second time.
One ton of corn cob slag can and arrive 110 kilograms of white powdery wood sugars, 144 ℃ of fusing points, and purity is more than 99.5%.
Claims (1)
1, a kind ofly extract improving one's methods of wood sugar by corn cob, by give processing, acid hydrolysis, concentrate, each unit process of crystallization constituted, it is characterized in that:
A, give processing: aqueous sulfuric acid concentration is 0.07～0.1%, handles 1 hour under 105～110 ℃ of conditions;
B, hydrolysis: aqueous sulfuric acid concentration is 0.7～0.8%, and hydrolysis is 2.5～3 hours under 120～125 ℃ of conditions; Corn cob slag after separation and washing discharges under the 0.2MPa condition with pressurized air;
C, concentrate: it is 20% to send dehydration for the second time in the rotary film evaporator when above that hydrolyzed solution dewaters under the condition of negative pressure in concentration tank to concentration, and the hydrolyzed solution after dewatering for the second time send crystallization in the crystallizer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96105693A CN1058996C (en) | 1996-05-14 | 1996-05-14 | Improved technology for extracting xylose from corncob |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN96105693A CN1058996C (en) | 1996-05-14 | 1996-05-14 | Improved technology for extracting xylose from corncob |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1165195A CN1165195A (en) | 1997-11-19 |
| CN1058996C true CN1058996C (en) | 2000-11-29 |
Family
ID=5118953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN96105693A Expired - Fee Related CN1058996C (en) | 1996-05-14 | 1996-05-14 | Improved technology for extracting xylose from corncob |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1058996C (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101108789B1 (en) | 2007-02-09 | 2012-03-13 | 씨제이제일제당 (주) | A method for xylitol production using the hydrolysate containing xylose and arabinose prepared from byproduct of tropical fruit biomass |
| CN101200479B (en) * | 2007-12-20 | 2010-08-25 | 武汉工程大学 | Method for reclaiming xylose from waste liquor of cellulose raw material pretreated by dilute acid |
| CN102597253B (en) | 2009-10-30 | 2015-04-08 | Cj第一制糖株式会社 | Process for economically manufacturing xylose from hydrolysate using electrodialysis and direct recovery method |
| CN102703613A (en) * | 2012-06-26 | 2012-10-03 | 山东福田药业有限公司 | Xylose hydrolysate preparation pre-treatment method for papermaking wastewater |
| CN103555864B (en) * | 2013-10-22 | 2015-07-22 | 广西金麦克生物科技有限公司 | Preparation method for xylose |
| CN107540714B (en) * | 2017-09-14 | 2019-09-17 | 齐鲁工业大学 | A kind of highly effective extraction method of Eucalyptus xylose |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2617503A1 (en) * | 1987-07-03 | 1989-01-06 | Etude Realisa Traitement Mais | Process for preparing xylose from maize |
| CN1032940A (en) * | 1988-11-12 | 1989-05-17 | 福建省漳州糖厂 | The preparation method of crystalline xylose |
| EP0432015A1 (en) * | 1989-12-07 | 1991-06-12 | Institut Français du Pétrole | Process and unit for producing a mixture of sugars containing at least 80% xylose from a lignocellulosic substrate |
-
1996
- 1996-05-14 CN CN96105693A patent/CN1058996C/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2617503A1 (en) * | 1987-07-03 | 1989-01-06 | Etude Realisa Traitement Mais | Process for preparing xylose from maize |
| CN1032940A (en) * | 1988-11-12 | 1989-05-17 | 福建省漳州糖厂 | The preparation method of crystalline xylose |
| EP0432015A1 (en) * | 1989-12-07 | 1991-06-12 | Institut Français du Pétrole | Process and unit for producing a mixture of sugars containing at least 80% xylose from a lignocellulosic substrate |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1165195A (en) | 1997-11-19 |
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