CN102807627A - Corn starch preparation method - Google Patents
Corn starch preparation method Download PDFInfo
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- CN102807627A CN102807627A CN2011101460831A CN201110146083A CN102807627A CN 102807627 A CN102807627 A CN 102807627A CN 2011101460831 A CN2011101460831 A CN 2011101460831A CN 201110146083 A CN201110146083 A CN 201110146083A CN 102807627 A CN102807627 A CN 102807627A
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Abstract
The invention provides a corn starch preparation method. The method includes: soaking niblets, condensing obtained corn soak solution, smashing soaked niblets to separate germs out, grinding niblet tissues containing corn bran and endosperms after degerming to separate fibers out, separating obtained coarse starch milk to obtain gluten water and starch milk, and washing the starch milk. The concentration method of the obtained corn soak solution includes evaporation of the corn soak solution, and the evaporation method includes that a falling film evaporator is used for condensing the corn soak solution to 40-45wt%, and a scraper film evaporator is used for condensing the 40-45wt% of corn steep liquor to 48-52wt%. Using the method can obtain high-concentration corn steep liquor and avoid the problem of influences on drying capacity of a drying machine and steam consumption caused by high water content of corn steep liquor added to a subsequent fiber feed drying procedure.
Description
Technical field
The present invention relates to a kind of preparation method of W-Gum.
Background technology
The leaching process of starch is the chief component separating process of corn grain, and the separation of each integral part of corn grain has two kinds of dry method and wet methods, and lock out operation main be to grind, therefore, the branch of dry grinding and wet-milling is arranged.
Wherein, wet-milling is the general technology of current corn starch industry, is mainly the corn process fragmentation of passing through dipping, takes off embryo, correct grinding and screening, to tell plumule, fibrous residue, makes the process of rough milk of starch.After starch wearable riddler preface was extracted, the gained milk of starch still was a coarse starch milk, still contains a large amount of insoluble proteins and soluble substance, and the concentration of powder slurry is also rarer, need make with extra care and concentrate, for processing and deep processing at last provides purified smart milk of starch.
Steeping water is one of significant by-products of wet milling process W-Gum production, also is the sub product that proposes at first in the starch production, is concentrated by corn steeping water to obtain, and is actually the extract of corn.Said corn steeping water outward appearance is the brown viscous liquid; Solids content is about 5-8 weight %, and the staple major part is corn soluble protein and degradation product thereof, like peptide class, each seed amino acid etc.; Also contain lactic acid, phytic acid ca magnesium salts, soluble saccharide in addition; Very high nutritive value is arranged, can be used for the microbiological culture media of fermentation industry, but most additive as animal-feed.
Because the concentration of corn steeping water is low, be not easy to store, transport and use, therefore, need to concentrate and remove moisture, in order to save energy consumption, generally take the multiple-effect evaporation that reduces pressure, being concentrated into solids content is about 40-45 weight %, is dense steeping water.Usually adopt the multiple-effect falling film vaporizer that steeping water is concentrated in the prior art; Purpose is the water cut that as far as possible reduces in the steeping water; To reduce the moisture that sprays into steeping water in the follow-up fiber feedstuff drying process as far as possible; The energy consumption of avoiding causing owing to excess moisture strengthens, and causes the reduction of drying machine output and makes steeping water can not join the medium problem of fiber feedstuff fully.Because falling-film evaporator adopts tubulation indirect heating material usually; If heated material concentration is too high, viscosity is big, is easy to cause the local dried wall of vaporizer heating tube; Coking, scale formation; And the obstruction heating tube, make steam capability reduce greatly, so spissated steeping water concentration generally can only reach about 40-45 weight %.
Summary of the invention
The objective of the invention is to overcome steeping water among the existing W-Gum preparation technology, to prepare the concentration of the concentrated steeping water that process of preparing obtains lower; Cause back dao feed drying process because of adding the defectives that steeping water institute band excess moisture influences the drying power of drying machine and consumes steam more, a kind of W-Gum preparation method of concentrated steeping water that can the by-product high density is provided.
The invention provides a kind of preparation method of W-Gum, this method comprises the soaking corn grain, concentrates the corn steep liquor that obtains; And the corn grain that will pass through immersion carries out fragmentation; Isolate plumule, the corn grain tissue that contains maize peel and endosperm that will take off behind the embryo grinds, and isolates fiber; The coarse starch milk that obtains separated obtain seitan water and milk of starch; And milk of starch washed, wherein, the method that concentrates the corn steep liquor that obtains comprises evaporates corn steep liquor; The method of said evaporation comprises that the employing falling-film evaporator is concentrated into 40-45 weight % with corn steep liquor, and adopts scrapper thin film evaporator that the steeping water of the 40-45 weight % that obtains is concentrated into 48-52 weight %.
Contriver of the present invention finds that though adopt the multiple-effect falling film vaporizer that steeping water is concentrated in the prior art usually, owing to receive all restrictions, spissated steeping water concentration generally can only reach about 40-45 weight %.In addition, scrapper thin film evaporator is because reasons in structure own can not be made too greatly, so its steam capability is limited, and prior art does not adopt scrapper thin film evaporator that steeping water is concentrated usually yet.And contriver of the present invention is surprised to find that; Adopt scrapper thin film evaporator and falling-film evaporator to form multi-effect evaporation system; Adopt falling-film evaporator that corn steep liquor is concentrated into 40-45 weight % earlier; Then utilize scrapper thin film evaporator as the high density concentrating unit, can be further be that the steeping water of 40-45 weight % is concentrated into 48-52 weight % with concentration.Avoided on the one hand when adopting falling-film evaporator that steeping water is concentrated; The dense steeping water of excessive concentration is because viscosity Da Yi stops up the problem of the heating tube of falling-film evaporator; And utilized the characteristics of scrapper thin film evaporator dexterously, as, what scrapper thin film evaporator adopted is the chuck heating; There is not obstructing problem; And can utilize the scraper plate in the scrapper thin film evaporator to force to stir, thereby can the concentration of steeping water be increased to suitable concentrated concentration (48-52 weight %), and obtain the higher steeping water liquid concentrator of concentration.Water-content reduces in the steeping water liquid concentrator of the high density that the present invention obtains, and therefore, can reduce the energy consumption of follow-up highly energy-consuming dehumidification system greatly.In addition, the high density steeping water that the present invention obtains is because drop temperature is high, and is better mobile, and available pipe is transported to follow-up drying plant and in time sprays in the fiber dry.
Other features and advantages of the present invention will partly specify in embodiment subsequently.
Description of drawings
Accompanying drawing is to be used to provide further understanding of the present invention, and constitutes the part of specification sheets, is used to explain the present invention with embodiment of the present invention, but is not construed as limiting the invention.In the accompanying drawings:
Fig. 1 adopts multi-effect evaporation system that corn steep liquor is carried out spissated schema among the preparation method of W-Gum provided by the invention.
Embodiment
The preparation method of W-Gum provided by the invention comprises the soaking corn grain; Concentrate the corn steep liquor obtain, and the corn grain that will pass through immersion carries out fragmentation, isolate plumule; The corn grain tissue that contains maize peel and endosperm that will take off behind the embryo grinds; Isolate fiber, the coarse starch milk that obtains is separated obtaining seitan water and milk of starch, and milk of starch is washed; Wherein, The method that concentrates the corn steep liquor that obtains comprises evaporates corn steep liquor, and the method for said evaporation comprises that the employing falling-film evaporator is concentrated into 40-45 weight % with the steeping water soak solution, and adopts scrapper thin film evaporator that the steeping water of the 40-45 weight % that obtains is concentrated into 48-52 weight %; Under the preferable case, adopt falling-film evaporator that the steeping water soak solution is concentrated into 40-42 weight %, and adopt scrapper thin film evaporator that the steeping water of the 40-42 weight % that obtains is concentrated into 48-50 weight %.
According to the present invention; As long as the method for said evaporation guarantees that after adopting falling-film evaporator that said steeping water soak solution is concentrated, making the concentration of the steeping water that obtains is 40-45 weight %; Be preferably 40-42 weight %; And guarantee adopting scrapper thin film evaporator with the 40-45 weight % that obtains, making the concentration of the spissated steeping water that obtains after the steeping water that is preferably 40-42 weight % concentrates is 48-52 weight %, is preferably 48-50 weight % and gets final product.
Under the preferable case, contriver of the present invention adopts scrapper thin film evaporator and falling-film evaporator to form multi-effect evaporation system, and said corn steep liquor is carried out multiple-effect evaporation.Wherein, said multiple-effect evaporation refers to the evaporation operation with several evaporator series operations, and steam thermal energy is repeatedly utilized, thereby improves the utilization ratio of heat energy.
Contriver of the present invention finds that adopting falling-film evaporator that number is imitated in the spissated evaporation of corn steep liquor can imitate for 3-4, and adopting the film-falling scraping plate vaporizer will pass through the further spissated evaporation of steeping water that the falling-film evaporator evaporation obtains, to imitate number be that 1-2 is imitated; Under the preferable case; Can adopt falling-film evaporator that the steeping water soak solution is carried out triple effect evaporation; Make the concentration of the steeping water that obtains reach 40-45 weight %, be preferably 40-42 weight %, then adopt one to imitate scrapper thin film evaporator the 40-45 weight % that obtains; Making the concentration of the spissated steeping water that obtains after the steeping water that is preferably 40-42 weight % concentrates is 48-52 weight %, is preferably 48-50 weight %.
According to a kind of embodiment of the present invention; Can adopt the method for quadruple effect evaporation that corn steep liquor is concentrated; That is, as shown in Figure 1, the first effect scrapper thin film evaporator and the second effect falling-film evaporator are connected; Second imitates falling-film evaporator connects with the triple effect falling-film evaporator, and the triple effect falling-film evaporator is connected with the quadruple effect falling-film evaporator.The method of said evaporation comprises corn steep liquor is pumped in the quadruple effect falling-film evaporator; Under 65-75 ℃ Heating temperature; Heating evaporation circulates to this corn steep liquor (IV is imitated charging); Obtaining concentration is the quadruple effect steeping water feed liquid of 7-10 weight % and 50-55 ℃ four effect juice steams, and this quadruple effect steeping water feed liquid (IV is imitated feed liquid) is pumped in the second effect falling-film evaporator, under 98-105 ℃ Heating temperature; To this quadruple effect steeping water feed liquid heating evaporation that circulates, obtain concentration and be two effect juice steams that two of 18-20 weight % is imitated steeping water feed liquids and 85-90 ℃; This two effect steeping water feed liquid (II is imitated feed liquid) is pumped in the triple effect falling-film evaporator; Under 85-90 ℃ Heating temperature; This two is imitated steeping water feed liquid heating evaporation that circulates, and obtaining concentration is the triple effect steeping water feed liquid of 40-45 weight % and 65-75 ℃ three effect juice steams; This triple effect steeping water feed liquid (III is imitated feed liquid) is pumped into one imitates in the scrapper thin film evaporator; Under 120-130 ℃ Heating temperature; This triple effect steeping water feed liquid is evaporated, and obtaining concentration is the concentrated steeping water (I is imitated discharging) of 48-52 weight % and an effect juice steam of 98-110 ℃.
According to the present invention; The vacuum tightness that above-mentioned quadruple effect, triple effect, second effect and first are imitated when evaporating is corresponding one by one with the thermodynamic principles of the vaporization temperature foundation of each effect; For the ease of observing operation; Under the preferable case, the vacuum tightness of in the quadruple effect falling-film evaporator, evaporating can be 0.08MPa to 0.09MPa, more preferably 0.084MPa to 0.088MPa; The vacuum tightness of in the triple effect falling-film evaporator, evaporating can be 0.06MPa to 0.075MPa; Imitate the vacuum tightness of evaporating in the falling-film evaporator second and can be 0.03MPa to 0.04MPa; Imitate the pressure that evaporates in the scrapper thin film evaporator first and can be 0.01, more preferably 0.01-0.046MPa to 0.05MPa.Wherein, said vacuum tightness refers to be in the rare book degree of gas under the vacuum state.If the pressure in institute's measurement equipment is lower than atmospheric pressure, its pressure survey needs vacuum meter.Claim vacuum tightness from the numerical value that vacuum meter is read.Vacuum values is to express the numerical value that the system pressure actual numerical value is lower than atmospheric pressure, that is: vacuum tightness=(atmospheric pressure-psia).
In order to reduce the consumption of living steam, under the preferable case, the heating steam that is used for the second effect falling-film evaporator comes from the mixing steam that an effect juice steam perhaps is an effect juice steam and living steam; The heating steam that is used for the triple effect falling-film evaporator comes from two effect juice steams; The heating steam that is used for the quadruple effect falling-film evaporator comes from three effect juice steams; The heating steam that is used for the first effect scrapper thin film evaporator comes from living steam.Four effect juice steams can cool off through condensing surface with water coolant usually, and are connected with vacuum system.
That is, in the flow process of above-mentioned quadruple effect evaporation operation, first imitates scrapper thin film evaporator giving birth to steam as heating steam, and second imitates the heating steam as this effect of the juice vapour (being secondary steam) that all produces with its last effect to the quadruple effect falling-film evaporator.Especially, if the effect juice steam that the first effect scrapper thin film evaporator produces can not satisfy the heating requirements of the second effect falling-film evaporator, can replenish living steam and satisfy its heating requirements to produce enough juice vapour.Can guarantee that like this multi-effect evaporation system has enough steam capabilitys, and heating steam can utilize repeatedly, thereby can reduce the consumption of living steam significantly.
Wherein, heating steam and corn steep liquor or each imitate the steeping water liquid concentrator that obtains the flow direction can for and flow process, countercurrent flow, also can be the cross-flow flow process, be preferably the cross-flow flow process.
Under the preferable case; In order to make the steam capability maximum of falling-film evaporator; Before this method also is included in and goes into quadruple effect corn syrup liquid pump in the second effect falling-film evaporator; Quadruple effect steeping water feed liquid is preheated to the vaporization temperature of imitating near two, that is, can carries out second after quadruple effect steeping water feed liquid is preheated to 85-90 ℃ immediately and imitate in the falling-film evaporator and evaporate.According to the present invention; Said method with the corn steep liquor preheating can adopt the conventional various heat-exchange equipments in this area to heat; Under the preferable case, can adopt tubular heat exchange to heat, and said preheating can at least partly come from two effect juice steams with heating steam.
According to the present invention, said falling-film evaporator and scrapper thin film evaporator are this area evaporation equipment commonly used.The principle of work of said falling-film evaporator is: the shell side of vertical closed container internal heating tube bank is heating steam, and tube side is for being evaporated solution, and solution is membranaceous landing by being pumped to the container top distribution plate along the tubulation inwall; And by external steam heating vaporization; Get into the separate chamber in the bottom and carry out vapor-liquid separation, because vacuum action, juice vapour gets into the shell side of back single-effect evaporator; Liquid is then pumped into the container top heating again, and circulation constantly.The principle of work of said scrapper thin film evaporator is: be heating steam in the chuck of vertical closed container; Container is interior for being evaporated solution; And adopt scraper plate to force to stir; Make solution become membranaceous distribution, and, get into the separate chamber on container top and carry out vapor-liquid separation by the vaporization of the steam heating in the chuck at container inner wall.
According to the present invention, corn grain soaked can adopt method known in those skilled in the art, for example, under 50-55 ℃, be that the sulfurous acid aqueous solution of 0.1-0.35 weight % contacts 40-52 hour with corn particle and concentration, obtain corn steep liquor.Can make its each integral part loose with sulfurous acid soaking corn grain; Weaken mutual contact, sulfurous acid can also destroy the protein net, makes the semipermeable partition of corn grain epidermis become permeable membrane; Quicken and promote to permeate and diffusion; Make a large amount of water absorption and swellings of corn grain, softening, the great amount of soluble protein dissolution helps further being processed into steeping water in soak solution.The difference of solid content in the corn steep liquor that different soaking conditionses possibly cause obtaining, generally, the solid content of said corn steep liquor is 5-8 weight %.
According to the present invention, the corn grain that will pass through immersion takes off embryo, and the method for isolating plumule also can be carried out according to the method for well known to a person skilled in the art; For example, utilize corn degerming mill (TCM920), make the corn grain that gets into degerming mill under action of centrifugal force, get into the moving of band double wedge and decide between tooth plate; Because two dishes are done rotation relatively; And close outside dredging in recessed tooth is on dish, maize germ, scurf and endosperm are because of the fragmentation in various degree of the different quilts of physical property, and be separated from one another.Because the specific density of plumule and rest part is different, under action of centrifugal force, the free plumule is separated.
According to the present invention; The corn grain tissue that contains maize peel and endosperm that will take off behind the embryo grinds; Isolate the method for fiber and also can carry out, for example, utilize the impact grinding of pin type to grind according to the method for well known to a person skilled in the art; At moving pin that receives high speed rotating and the fixed strong bump in repeated multiple times ground of deciding pin, most starch and fiber get loose and dissociate out.The thickness slag ratio generally can be 2.5-3: 1.Though the starch through after grinding has been unbound state, but still mixes with fibrous residue, owing to varying in size of several kinds of material particles; The screening plant that therefore, can utilize different apertures with fiber by separating in the farinaceous size, in said farinaceous size; The size of starch granules is generally the 3-30 micron; The particle size of fine-fibered is generally more than 65 microns in the fibrous residue, and the robust fibre slag becomes big sheet, and the seitan particle size is generally the 1-2 micron.Said screening plant can be various screening plants, for example, and trommel, oscillating flat sieve, centrifugal screen etc.
According to the present invention, the coarse starch milk that obtains separated obtaining seitan water and milk of starch, and the method that milk of starch washs can be carried out for method well known in the art.For example, milk of starch and the isolating principle of seitan mainly utilize specific density and the particle size of these two kinds of materials different and separate, and for example, can adopt settling process or centrifuging to separate.
Need to prove in addition; Each concrete technical characterictic described in above-mentioned embodiment under reconcilable situation, can make up through any suitable manner; For fear of unnecessary repetition, the present invention is to the explanation no longer separately of various possible array modes.
In addition, also can carry out arbitrary combination between the various embodiment of the present invention, as long as it is without prejudice to thought of the present invention, it should be regarded as the disclosed content of the present invention equally.
To further describe in detail the present invention through specific embodiment below, following examples only are used to explain the present invention, but are not used for limiting scope of the present invention.
Used two effects, triple effect and quadruple effect falling-film evaporator and this area falling-film evaporator commonly used among the following embodiment, available from the Yixing City,Grant dry and enrichment equipment Co., Ltd, model is JMZ-4.5, the moisture evaporation ability is 4500kg/h; Used one imitates the scrapper thin film evaporator that scrapper thin film evaporator and this area are used always, avenges unrestrained chemical plant factory available from Wuxi City Xishan, and model is LG-0.8, and the moisture evaporation ability is 160kg/h.
Adopt disc separator that seitan water is concentrated perhaps among the following embodiment and carry out solid-liquid separation, concentrated phase flows out from underflow, and stream flows out water from the top; The model of used disc-type separating centrifuge is DPF530.
Embodiment 1
Present embodiment is used to explain the preparation method of W-Gum provided by the invention.
(1) raw materials pretreatment
Maize raw material (water cut 14 weight %) through chapelet carry get into successively receiving sieve, tramp iron separator, plane rotation cleaning screen, except that cleaning sections such as stone, magnetic separation;
(2) soak
To purify corn metering back, back and be delivered to steeping tank with waterpower, use concentration is that the sulfurous acid aqueous solution of 0.25 weight % carries out the adverse current immersion.Soaking filling is 10; Every tankage is 50 tons of maize raw materials after the above-mentioned purification, and the soak solution of steeping tank passes through a pump part self circulation, and a part is countercurrent flow with the adding corn; Be that initiate corn is used old soak; The corn that soaks is at most used new soak, and the soak time of corn is 48 hours, and soaking temperature is 50 ± 2 ℃.
(3) evaporation
According to Fig. 1; Three falling-film evaporators and a scrapper thin film evaporator are formed multiple-effect evaporator; The first effect scrapper thin film evaporator and the second effect falling-film evaporator are connected; Second imitates falling-film evaporator connects with the triple effect falling-film evaporator, and the triple effect falling-film evaporator is connected with the quadruple effect falling-film evaporator.
Will (every jar goes out 30m approximately by 50 ℃ of corn steep liquors extracting out in the steeping tank
3, dry matter content is 7 weight %), pump in the quadruple effect falling-film evaporator in the said multi-effect evaporation system that (control corn soaking flow quantity is 6m
3/ h); Under the vacuum tightness of 70 ℃ Heating temperatures, 0.068MPa; To the said corn steep liquor heating evaporation that circulates; Obtaining concentration is the quadruple effect steeping water feed liquid of 9 weight % and 52 ℃ four effect juice steams, this four effect juice steam is connected with vacuum pump through pipe bundle condenser, and (control feed liquid flow is 5-6m with the extraction of quadruple effect steeping water feed liquid
3/ h) and pump into second after being preheated to 85 ℃ and imitate in the falling-film evaporator; Under the vacuum tightness of 103 ℃ Heating temperatures, 0.015MPa; To the said quadruple effect steeping water feed liquid heating evaporation that circulates, obtain concentration and be two effect juice steams (part two is imitated the juice gas can be used for preheating quadruple effect steeping water feed liquid) that two of 20 weight % are imitated steeping water feed liquids and 88 ℃; Imitate the corn syrup liquid pumps with said two then and go into that (control feed liquid flow is 2-3m in the triple effect falling-film evaporator
3/ h); Under the vacuum tightness of 88 ℃ Heating temperatures, 0.034MPa; Adopt the two juice vapour of imitating to imitate the steeping water feed liquids heating evaporation that circulates to said two; Obtain output and be 1000kg/h, concentration and be triple effect steeping water feed liquid and 70 ℃ three effect juice steams about 42 weight %, and three effect juice steams to remake be the thermal source of quadruple effect falling-film evaporator; With said 1000kg/h, concentration is that triple effect corn syrup liquid pump about 42 weight % is gone into first and imitated in the scrapper thin film evaporator; And adopt 125 ℃ living steam, under the pressure of 0.24MPa; Said triple effect steeping water feed liquid is carried out heating evaporation, and obtaining output is that 840kg/h, concentration are the concentrated steeping water about 50 weight %.
(4) take off embryo
Corn after soaking is got into the wet corn hopper by the wet corn transferpump through rockover remover; Get into the one-level degerming mill again; Corn is broken into the 4-6 lobe; Contain shaping corn amount and be no more than 1 weight %, and tell the plumule of the 75-89 weight % of plumule total amount, discharge the starch of the 20-25 weight % of total starch content simultaneously;
Corn after the fragmentation is pumped to the plumule primary cyclone with plumule, and the effusive plumule in separator top removes washing system, and the underflow thing gets into the secondary degerming mill; Corn is broken for the 10-12 lobe; In this slurry, do not contain whole kernel corn, the plumule that is in bonding state is no more than 0.3 weight %, and the slurry of process secondary breaking is pumped into secondary plumule cyclone separator through plumule; Top stream thing gets into one-level germ separation device again, and underflow slurry is gone into the fine grinding operation.
(5) fine grinding
The underflow grout that process secondary cyclone separator is isolated behind the plumule passes through pressure curved sieve, and screen underflow is a coarse starch milk; Screen overflow gets into impact grinding (or pin mill) and carries out fine grinding, dissociates out with the free starch that itself and fiber are connect, and in the feasible slurry after grinding of the condition of pin mill, connects starch and is not more than 10 weight %.
Slurry after the fine grinding gets into the fiber wash groove, delivers to first step pressure curved sieve at these washing water with later washing the fibre.Screen underflow is isolated coarse starch milk, and through the countercurrent washing of the bent sieve of 6 stage pressures, washing process water adds before the last step sieve screen overflow again; Through compass screen surface, carrying the free starch that washs and moving forward step by step, before first step sieve in the rinse bath; Merge with the slurry after the fine grinding, get into first step pressure curved sieve jointly, tell coarse starch milk; The screen underflow coarse starch milk that this milk of starch and fine grinding fore worker are told converges, and gets into the starch separation circuit.Fiber on the compass screen surface, skin slag and washing water are gone against the stream, and,, after washing screening several times, discharge from the bent sieve of last step to each sieve is mobile later on from first sieve, dewater through screw extrusion press then.
(6) milk of starch is refining
Bent screening after sand separator, revolving filter are removed impurity, gets into elementary separating centrifuge (disc separator) from the thick starch that obtains from the fine grinding front and back, and it is rare seitan water that the overflow substance of discharging is flowed on the top;
The starch concentration that obtains from elementary separating centrifuge underflow is 19-20 ° of Be '; And the moisture about 60 weight % of purified starch breast after 12 grades of swirler-washings; Protein contnt is less than 0.35 weight %; Smart milk of starch obtains the wet starch of moisture 38-40 weight % after dehydration, wet starch is sent into pneumatic drier and is dried to the commodity starch finished product.
Embodiment 2
Present embodiment is used to explain the preparation method of W-Gum provided by the invention.
Method according to embodiment 1 prepares W-Gum, and different is: in the evaporation technology of step (3), and will (every jar goes out 25m approximately by 50 ℃ of corn steep liquors extracting out in the steeping tank
3, dry matter content is 8 weight %) and pump in the quadruple effect falling-film evaporator in the said multi-effect evaporation system that (control corn soaking flow quantity is 6.2m
3/ h); Under the vacuum tightness of 70 ℃ Heating temperatures, 0.068MPa; To the said corn steep liquor heating evaporation that circulates; Obtaining concentration is the quadruple effect steeping water feed liquid of 10 weight % and 52 ℃ four effect juice steams, this four effect juice steam is connected with vacuum pump through pipe bundle condenser, and (control feed liquid flow is 5-6m with the extraction of quadruple effect steeping water feed liquid
3/ h) and pump into second after being preheated to 88 ℃ and imitate in the falling-film evaporator; Under the vacuum tightness of 105 ℃ Heating temperatures, 0.023MPa; To the said quadruple effect steeping water feed liquid heating evaporation that circulates, obtain concentration and be two effect juice steams (part two is imitated the juice gas can be used for preheating quadruple effect steeping water feed liquid) that two of 21 weight % are imitated steeping water feed liquids and 90 ℃; Imitate the corn syrup liquid pumps with said two then and go into that (control feed liquid flow is 2-3m in the triple effect falling-film evaporator
3/ h); Under the vacuum tightness of 90 ℃ Heating temperatures, 0.03MPa; Adopt the two juice vapour of imitating to imitate the steeping water feed liquids heating evaporation that circulates to said two; Obtain output and be 1180kg/h, concentration and be triple effect steeping water feed liquid and 70 ℃ three effect juice steams about 42 weight %, and three effect juice steams to remake be the thermal source of quadruple effect falling-film evaporator; With said 1180kg/h, concentration is that triple effect corn syrup liquid pump about 42 weight % is gone into first and imitated in the scrapper thin film evaporator; And adopt 130 ℃ living steam, under the pressure of 0.18MPa; Said triple effect steeping water feed liquid is carried out heating evaporation, and obtaining output is that 990kg/h, concentration are the concentrated steeping water about 51 weight %.
Embodiment 3
Present embodiment is used to explain the preparation method of W-Gum provided by the invention.
Method according to embodiment 1 prepares W-Gum, and different is: in the evaporation technology of step (3), and will (every jar goes out 35m approximately by 50 ℃ of corn steep liquors extracting out in the steeping tank
3, dry matter content is 6 weight %) and pump in the quadruple effect falling-film evaporator in the said multi-effect evaporation system that (control corn soaking flow quantity is 5.8m
3/ h); Under the vacuum tightness of 65 ℃ Heating temperatures, 0.075MPa; To the said corn steep liquor heating evaporation that circulates; Obtaining concentration is the quadruple effect steeping water feed liquid of 8 weight % and 50 ℃ four effect juice steams, this four effect juice steam is connected with vacuum pump through pipe bundle condenser, and (control feed liquid flow is 5-6m with the extraction of quadruple effect steeping water feed liquid
3/ h) and pump into second after being preheated to 85 ℃ and imitate in the falling-film evaporator; Under the pressure of 99 ℃ Heating temperatures, 0MPa; To the said quadruple effect steeping water feed liquid heating evaporation that circulates, obtain concentration and be two effect juice steams (part two is imitated the juice gas can be used for preheating quadruple effect steeping water feed liquid) that two of 19 weight % are imitated steeping water feed liquids and 85 ℃; Imitate the corn syrup liquid pumps with said two then and go into that (control feed liquid flow is 2-3m in the triple effect falling-film evaporator
3/ h); Under the vacuum tightness of 85 ℃ Heating temperatures, 0.04MPa; Adopt the two juice vapour of imitating to imitate the steeping water feed liquids heating evaporation that circulates to said two; Obtain output and be 830kg/h, concentration and be triple effect steeping water feed liquid and 65 ℃ three effect juice steams about 42 weight %, and three effect juice steams to remake be the thermal source of quadruple effect falling-film evaporator; With said 830kg/h, concentration is that triple effect corn syrup liquid pump about 42 weight % is gone into first and imitated in the scrapper thin film evaporator; And adopt 120 ℃ living steam, under the pressure of 0.1MPa; Said triple effect steeping water feed liquid is carried out heating evaporation, and obtaining output is that 700kg/h, concentration are the concentrated steeping water about 50 weight %.
Comparative Examples 1
This Comparative Examples is used to explain the preparation method of the W-Gum of prior art.
Method according to embodiment 1 prepares W-Gum; Different is: in the evaporation technology of step (3); Adopt triple effect falling-film evaporator system that corn steep liquor is concentrated; That is be that the corn steep liquor of 7 weight % pumps into that (control corn soaking flow quantity is 6m in the quadruple effect falling-film evaporator in the said multi-effect evaporation system, with 50 ℃, dry matter content
3/ h); Under the vacuum tightness of 70 ℃ Heating temperatures, 0.068MPa; To the said corn steep liquor heating evaporation that circulates; Obtaining concentration is the quadruple effect steeping water feed liquid of 9 weight % and 52 ℃ four effect juice steams, this four effect juice steam is connected with vacuum pump through pipe bundle condenser, and (control feed liquid flow is 5-6m with the extraction of quadruple effect steeping water feed liquid
3/ h) and pump into second after being preheated to 85 ℃ and imitate in the falling-film evaporator; Under the vacuum tightness of 103 ℃ Heating temperatures, 0.015MPa; To the said quadruple effect steeping water feed liquid heating evaporation that circulates, obtain concentration and be two effect juice steams (part two is imitated the juice gas can be used for preheating quadruple effect steeping water feed liquid) that two of 20 weight % are imitated steeping water feed liquids and 88 ℃; Imitate the corn syrup liquid pumps with said two then and go into that (control feed liquid flow is 2-3m in the triple effect falling-film evaporator
3/ h); Under the vacuum tightness of 88 ℃ Heating temperatures, 0.034MPa; Adopt the two juice vapour of imitating to imitate the steeping water feed liquids heating evaporation that circulates to said two; Obtain output and be 1000kg/h, concentration and be triple effect steeping water feed liquid and 70 ℃ three effect juice steams about 42 weight %, and three effect juice steams to remake be the thermal source of quadruple effect falling-film evaporator.If in the triple effect falling-film evaporator, feed liquid is continued evaporation, make its concentration reach 48-52 weight %, then can be owing to viscosity of sludge is excessive; Mobile poor; And dried wall, coking phenomenon appear in heating tube, heating tube is stopped up in the long-time running meeting, and vaporizer can not normally be moved.
Claims (9)
1. the preparation method of a W-Gum, this method comprises the soaking corn grain, concentrates the corn steep liquor that obtains; And the corn grain that will pass through immersion carries out fragmentation; Isolate plumule, the corn grain tissue that contains maize peel and endosperm that will take off behind the embryo grinds, and isolates fiber; The coarse starch milk that obtains separated obtain seitan water and milk of starch; And milk of starch washed, it is characterized in that the method that concentrates the corn steep liquor that obtains comprises evaporates corn steep liquor; The method of said evaporation comprises that the employing falling-film evaporator is concentrated into 40-45 weight % with corn steep liquor, and adopts scrapper thin film evaporator that the steeping water of the 40-45 weight % that obtains is concentrated into 48-52 weight %.
2. method according to claim 1; Wherein, The method of said evaporation comprises that the employing falling-film evaporator is concentrated into 40-42 weight % with the steeping water soak solution, and adopts scrapper thin film evaporator that the steeping water of the 40-42 weight % that obtains is concentrated into 48-50 weight %.
3. method according to claim 1 and 2; Wherein, Adopting falling-film evaporator that number is imitated in the spissated evaporation of corn steep liquor is that 3-4 is imitated, and adopting the film-falling scraping plate vaporizer will pass through the further spissated evaporation of steeping water that the falling-film evaporator evaporation obtains, to imitate number be that 1-2 is imitated.
4. method according to claim 3; Wherein, the method for said evaporation comprises corn steep liquor is pumped in the quadruple effect falling-film evaporator, under 65-75 ℃ Heating temperature; To this corn steep liquor heating evaporation that circulates; Obtaining concentration is the quadruple effect steeping water feed liquid of 7-10 weight % and 50-55 ℃ four effect juice steams, and this quadruple effect corn syrup liquid pump is gone in the second effect falling-film evaporator, under 98-105 ℃ Heating temperature; To this quadruple effect steeping water feed liquid heating evaporation that circulates, obtain concentration and be two effect juice steams that two of 18-20 weight % is imitated steeping water feed liquids and 85-90 ℃; This two is imitated corn syrup liquid pump and go in the triple effect falling-film evaporator, under 85-90 ℃ Heating temperature, this two is imitated steeping water feed liquid heating evaporation that circulates, obtaining concentration is the triple effect steeping water feed liquid of 40-45 weight % and 65-75 ℃ three effect juice steams;
This triple effect corn syrup liquid pump is gone into one imitate in the scrapper thin film evaporator, under 120-130 ℃ Heating temperature, this triple effect steeping water feed liquid is evaporated, obtaining concentration is the concentrated steeping water of 48-52 weight % and an effect juice steam of 98-110 ℃.
5. method according to claim 4; Wherein, The vacuum tightness of in the quadruple effect falling-film evaporator, evaporating is 0.08MPa to 0.09MPa; The vacuum tightness of in the triple effect falling-film evaporator, evaporating is 0.06MPa to 0.075MPa, and imitating the vacuum tightness of evaporating in the falling-film evaporator second is 0.03MPa to 0.04MPa, and imitating the pressure that evaporates in the scrapper thin film evaporator first is 0.01MPa to 0.05MPa.
6. method according to claim 4, wherein, the heating steam that is used for the second effect falling-film evaporator comes from the mixing steam that an effect juice steam perhaps is an effect juice steam and living steam; The heating steam that is used for the triple effect falling-film evaporator comes from two effect juice steams; The heating steam that is used for the quadruple effect falling-film evaporator comes from three effect juice steams.
7. method according to claim 4; Wherein, This method is preheated to 85-90 ℃ with quadruple effect steeping water feed liquid before also being included in and going into quadruple effect corn syrup liquid pump in the second effect falling-film evaporator, and said preheating at least partly comes from two effect juice steams with heating steam.
8. method according to claim 1, wherein, the method for said soaking corn grain is included under 50-55 ℃, is that the sulfurous acid aqueous solution of 0.1-0.35 weight % contacts 40-52 hour with corn grain and concentration, obtains corn steep liquor.
9. according to claim 1 or 8 described methods, wherein, the solid content of said corn steep liquor is 5-8 weight %.
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| CN109776689A (en) * | 2019-01-15 | 2019-05-21 | 迈安德集团有限公司 | A kind of processing technology of corn |
| CN111359240A (en) * | 2020-03-30 | 2020-07-03 | 山东凯斯达机械制造有限公司 | Tubular falling film evaporator, concentration device and using method and process of concentration device |
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| CN112915563A (en) * | 2021-03-10 | 2021-06-08 | 郑州博大浓缩干燥设备有限公司 | Efficient energy-saving evaporation system for corn soaking liquid |
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| CN112457419A (en) * | 2020-11-23 | 2021-03-09 | 鲁洲生物科技（山东）有限公司 | Method for shortening corn soaking time by using tumbling technology in cooperation with sulfurous acid |
| CN112915563A (en) * | 2021-03-10 | 2021-06-08 | 郑州博大浓缩干燥设备有限公司 | Efficient energy-saving evaporation system for corn soaking liquid |
| CN114440670A (en) * | 2021-12-23 | 2022-05-06 | 肇庆焕发生物科技有限公司 | Method for comprehensively utilizing waste heat in corn starch production |
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