CN103803547B - A kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac - Google Patents

A kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac Download PDF

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CN103803547B
CN103803547B CN201410052526.4A CN201410052526A CN103803547B CN 103803547 B CN103803547 B CN 103803547B CN 201410052526 A CN201410052526 A CN 201410052526A CN 103803547 B CN103803547 B CN 103803547B
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bagasse
gac
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CN103803547A (en
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李正元
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JIANGSU ZHUHAI ACTIVATED CARBON Co Ltd
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JIANGSU ZHUHAI ACTIVATED CARBON Co Ltd
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Abstract

The present invention relates to absorbent charcoal material, be specifically related to a kind of biological waste resource-bagasse that utilizes to prepare the method for foodstuff sanitation-stage gac.Rear for sugaring remaining bagasse is collected cleaning, after fully fermenting at 10-50 DEG C, dries, pulverize, sieve.Then by pretreated bagasse after the manipulation such as activator solution immersion, charing, activation, washing, oven dry, pulverizing obtain high performance activated carbon product, can be used for the decolouring in the food and medicine field such as sugar industry and medical material medicine, refining and removal of impurities.Present method utilizes discarded bagasse to be raw material, is not only conducive to comprehensive utilization and the protection of the environment of resource, and cheap, and quality product is high, has good economic and social benefit.

Description

A kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac
Technical field
The present invention relates to absorbent charcoal material, be specifically related to a kind of biological waste resource-bagasse that utilizes to prepare the method for foodstuff sanitation-stage gac.
Background technology
Bagasse is the principal by product of sugar industry, is a kind of important renewable biomass resource; China is the third-largest cane planting state being only second to Brazil and India, and sugarcane ultimate production is more than 7,000 ten thousand tons, and the output of the fibering stem stalk material-bagasse after cane milling sugaring reaches more than 7,000,000 tons; The composition of bagasse is based on Mierocrystalline cellulose, hemicellulose and xylogen, and albumen, starch and soluble sugar content are less; Because the degree of lignification of bagasse is higher; there is the reasons such as silicified cell in stem epidermis; it is all difficult to be effectively transformed utilization for a long time, often go out of use need not, or be only simple as fuel; utilization ratio is very low; not only cause the waste of resource, but also bring the pollution of environment, therefore; the sugar industry solid slag how cost-effective disposal and utilization produces every year in a large number, for resource to make full use of with the protection of environment be all very important problem.
Utilize bagasse to prepare gac and not only can provide approach and thinking for the trans-utilization solving bagasse, and with other materials for raw material is prepared compared with gac, there is unique advantage: dry matter content high (90-92%) in bagasse, raw material sources are concentrated, output is large, it is simple, cheap to collect, and the composition of bagasse is relatively stable, character is homogeneous, meet raw material centrality, continuity and the uniformity requirements needed for industrialization scale operation; In addition, as the reproducible biomass material of one, not containing any harmful element and composition in bagasse, non-toxic and safe, therefore, bagasse is the high quality raw material that preparation can be used for the high performance active carbon of the processes such as the decolouring of food and medicine health field, refining and removal of impurities.
At present, the preparation of gac mainly contains Physical and chemical method two kinds; Physical mainly with water vapour and carbonic acid gas for activated media, chemical method mainly with the chemical reagent such as phosphoric acid, zinc chloride for activator, compared with Physical, chemical method has the advantages such as energy consumption is low, yield is high.In chemical method, the complex body of the portion of cellulose molecule in bagasse can dissolve by activator, when heating charing, activation, activator is had an effect as the hydroxyl of electron pair donor and acceptor center and cellulose complex, makes the bond rupture between cellulosic molecule, form chain molecule, thus being easy to ring structureization formation condensation ring-type two dimensional structure, further condensation, forms tridimensional network, and then form the polycondensation charcoal of micropore, mesopore, excessively hole prosperity, there is excellent decolouring, adsorptive power; Therefore, in chemical method, chemical activating agent is not only as dewatering agent but also as oxygenant, the steps such as dehydration and oxidation, charing and activation are carried out simultaneously, not only decrease processing step, shorten the production cycle, and be conducive to forming vesicular structure, good product quality, in the actual production of current gac and research, also based on chemical method.
Chinese patent CN101920966 discloses a kind of method utilizing rice hull ash to produce gac, namely first adopt subcarbonate secondary alkali molten at a lower temperature, after filtration with highly basic such as sodium hydroxide for activator, activation, washing, obtain the gac with high specific surface area after drying; Chinese patent CN101717085 take coal-tar pitch as raw material, after formerly carrying out preoxidation, is that activator activates equally with strongly alkaline compound, then with after sanitising agent cleaning, drying obtains a kind of ball shape active carbon product; But the practical technique that current China utilizes bagasse to carry out scale operation high performance active carbon for raw material is also very rare.
Summary of the invention
The object of the invention is: provide a kind of sugar industry residue-bagasse that utilizes to produce the method for foodstuff sanitation-stage gac; The inventive method is adopted to produce gac, comprehensive utilization not only for solving bagasse provides good approach, and the gac specific surface area prepared is high, decolouring, high adsorption capacity, non-toxic and safe, can be used for the decolouring of sugar industry and medical material medicine, refining and removal of impurities etc.
To achieve these goals, a kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac of the present invention,
Mainly comprise the steps:
1) be 1:1 ~ 10 according to the volume ratio of bagasse and water, bagasse is cleaned 1-3 time, removing sandstone wherein
Impurity, dries or oven for drying naturally.
2), after bagasse step 1) obtained fully ferments at 10-50 DEG C, screened by 30-60 mesh sieve,
Removing finely ground particle substance.
3) by step 2) bagasse that obtains and activator solution mix according to the ratio of volume ratio 0.4-2 and soak, soaked
Apply in journey to stir, make mixing of materials even; After immersion, utilize screen filtration separation of sugarcane slag and activator solution, activator solution recycling use.
4) bagasse step 3) obtained at high temperature carries out carbonizing and activating, and is then 3-5 by clear water rinsing to pH value, pulverizes and dries.
Preferably, in step 1), the drying mode of employing is that nature dries or oven for drying, and oven temperature is 70-120 DEG C, and time of drying is 2-5 hour.
Preferably, step 2) the middle fermentation process adopted, its leavening temperature is 10-50 DEG C, and fermentation time is 20-30 days, and when sieving after fermentation, screen cloth is 30-60 order.
Preferably, the promoting agent adopted in step 3) is phosphoric acid, zinc chloride or salt of wormwood, and the concentration of activator solution is 300-600g/L, and soaking temperature is 20-60 DEG C, and soak time is 0.5-3 hour, and the impregnating ratio of bagasse and promoting agent is 0.4-2.
Preferably, the charing adopted in step 4), activation method, carbonization temperature is 350-450 DEG C, and carbonization time is 400-550 minute; Activation temperature is 500-800 DEG C, and soak time is 45-120 minute.
The gac that the inventive method prepares has following characteristic index and performance through thermogravimetric analysis and X-ray fluorescence spectra test:
Ash content (mass percentage) :≤5%;
Muriate (mass percentage) :≤0.05%;
Molysite (mass percentage) :≤0.05%;
Heavy metal (mass percentage) :≤0.05%;
Zinc salt (mass percentage) :≤0.08%;
All the other are gac composition.
Methylene blue decolours: >=140ml/g;
Caramel decolours: 100%;
The bagasse of preparation prepares foodstuff sanitation-stage gac photo as shown in Figure 1.
In bagasse, dry matter content is high, stable components, and source is concentrated, and it is convenient to collect, cheap, utilizes bagasse to prepare gac obvious especially for the decolouring of sugar industry, treating process advantage because bagasse this be exactly main waste residue after refining sugar; Prepare gac own characteristic according to bagasse, add unique spontaneous fermentation preprocessing process, improve yield and the absorption property of gac; As without sufficient spontaneous fermentation process, directly prepare gac, although also activated carbon product can be obtained, but ash oontent in the finished product can be caused greatly to exceed standard, and ash oontent is at 10-15%), adsorption bleaching characteristic also reduces, caramel decolours: 95%, and methylene blue decolours: 100-120ml/g.
Beneficial effect of the present invention is: the present invention adopts the solid slag-bagasse of sugar industry to be that raw material is to prepare gac, be not only the recycling of solution bagasse, avoid the waste of resource and environmental pollution to provide effective way, and bagasse itself is a kind of recyclable organism material of safety non-toxic, the gac prepared by it can be directly used in the food such as sugaring and medicaments injection, the decolouring of medicine industry, refining and removal of impurities, added value of product is high, can produce good Social and economic benef@.In addition, with with other materials for raw material is prepared compared with gac, dry matter content high (90-92%) in bagasse, raw material sources are concentrated, output is large, it is simple, cheap to collect, and the composition of bagasse is relatively stable, character is homogeneous, meet raw material centrality, continuity and the uniformity requirements needed for industrialization scale operation.
A kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac provided by the invention, first fermentation process is utilized to carry out pre-treatment in early stage to bagasse, then phosphoric acid or the agent of salt of wormwood isoreactivity is utilized to soak bagasse, carbonize, activate, not only increase the yield of gac, and the gac prepared has excellent decolouring and adsorptive power, food, the relevant decolouring of pharmaceutical industries, the service requirements of refining and impurity removal process can be met.
Accompanying drawing explanation
Fig. 1 is that foodstuff sanitation-stage gac photo prepared by bagasse prepared by the present invention.
Embodiment
Embodiment 1:
By bagasse and clear water with the ratio mix and blend of solid-to-liquid ratio 1:1, after cleaning 3 times, naturally dry; Then by bagasse 10 DEG C of temperature bottom fermentations 30 days, cross 30 mesh sieve, removing finely ground particle substance; With the phosphoric acid solution of concentration 400g/L for promoting agent, according to the impregnating ratio of 1.5:1 the bagasse after fermentation mixed with activator solution and soak, at 20 DEG C, insulated and stirred is after 3 hours, filtering separation bagasse and activator solution, activator solution recycling use; Then, under 350 DEG C of conditions, carbonize 550 minutes by filtering obtain bagasse, being warmed up to 500 DEG C of continuation activation 120 minutes, with water rinse to pH value 3, finally, ovendry power is broken to 200 orders, obtains final activated carbon product.
Embodiment 2:
By bagasse and clear water with the ratio mix and blend of solid-to-liquid ratio 1:4, after cleaning 2 times, naturally dry; Then by bagasse 20 DEG C of temperature bottom fermentations 26 days, cross 30 mesh sieve, removing finely ground particle substance; With the solution of potassium carbonate of concentration 300g/L for promoting agent, according to the impregnating ratio of 2:1 the bagasse after fermentation mixed with activator solution and soak, at 30 DEG C, insulated and stirred is after 2 hours, filtering separation bagasse and activator solution, activator solution recycling use; Then, under 400 DEG C of conditions, carbonize 480 minutes by filtering obtain bagasse, being warmed up to 700 DEG C of continuation activation 80 minutes, with water rinse to pH value 5, finally, ovendry power is broken to 200 orders, obtains final activated carbon product.
Embodiment 3:
By bagasse and clear water with the ratio mix and blend of solid-to-liquid ratio 1:8, after cleaning 1 time, put into baking oven and dry 5 hours at 70 DEG C; Then by the bagasse after cleaning, drying 40 DEG C of temperature bottom fermentations 23 days, cross 40 mesh sieve, removing finely ground particle substance; With the solution of potassium carbonate of concentration 600g/L for promoting agent, according to the impregnating ratio of 0.4:1 the bagasse after fermentation mixed with activator solution and soak, at 60 DEG C, insulated and stirred is after 0.5 hour, filtering separation bagasse and activator solution, activator solution recycling use; Then, under 450 DEG C of conditions, carbonize 400 minutes by filtering the bagasse obtained, be warmed up to 750 DEG C and continue activation 55 minutes, be 4 by water rinse to pH value, finally, ovendry power is broken to 200 orders, obtains final activated carbon product.
Embodiment 4:
By bagasse and clear water with the ratio mix and blend of solid-to-liquid ratio 1:10, after cleaning 1 time, put into baking oven and dry 2 hours at 120 DEG C; Then by the bagasse after cleaning, drying 50 DEG C of temperature bottom fermentations 20 days, dry rear mistake 60 mesh sieve, removing finely ground particle substance.With the phosphoric acid solution of concentration 600g/L for promoting agent, according to the impregnating ratio of 0.4:1 the bagasse after fermentation mixed with activator solution and soak, at 40 DEG C, insulated and stirred is after 1.5 hours, filtering separation bagasse and activator solution, activator solution recycling use; Then, under 400 DEG C of conditions, carbonize 500 minutes by filtering obtain bagasse, being warmed up to 800 DEG C of continuation activation 45 minutes, with water rinse to pH value 4, finally, ovendry power is broken to 200 orders, obtains final activated carbon product.
The invention provides a kind of utilize bagasse to prepare foodstuff sanitation-stage gac thinking and method, the method and access of this technical scheme of specific implementation is a lot, and the above is only the preferred embodiment of the present invention.

Claims (4)

1. utilize bagasse to prepare a method for foodstuff sanitation-stage gac, it is characterized in that comprising the steps:
1), after bagasse being cleaned, naturally dry or oven for drying;
2) bagasse that step 1) obtains fully is fermented, after screening, remove finely ground particle substance;
3) by step 2) bagasse that obtains and activator solution mix according to the ratio of volume ratio 0.4-2 and soak, soak
Apply in process to stir, make mixing of materials even; After immersion, utilize screen filtration separation of sugarcane slag and activator solution, activator solution recycling use;
4) bagasse step 3) obtained at high temperature carries out carbonizing and activating, and is then 3-5 by clear water rinsing to pH value, pulverizes and dries;
Described abundant fermentation refers to: leavening temperature is 10-50 DEG C, and fermentation time is 20-30 days; The screen cloth of described screening is 30-60 order; The charing adopted in step 4), activation method, carbonization temperature is 350-450 DEG C, and carbonization time is 400-550 minute; Activation temperature is 500-800 DEG C, and soak time is 45-120 minute.
2. a kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac as claimed in claim 1, it is characterized in that described bagasse is cleaned after, naturally to dry or oven for drying refers to: be 1:1 ~ 10 according to the volume ratio of bagasse and water, bagasse is cleaned 1-3 time, removing sandstone impurity wherein, dries or oven for drying naturally.
3. a kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac as claimed in claim 1 or 2, it is characterized in that: described oven for drying refers to: oven temperature is 70-120 DEG C, time of drying is 2-5 hour.
4. a kind of method utilizing bagasse to prepare foodstuff sanitation-stage gac as claimed in claim 1, it is characterized in that: the promoting agent adopted in step 3) is phosphoric acid, zinc chloride or salt of wormwood, the concentration of activator solution is 300-600g/L, soaking temperature is 20-60 DEG C, and soak time is 0.5-3 hour.
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