CN102433369B - Comprehensive process and equipment for producing starch through enzymolysis of corn in high proportion - Google Patents
Comprehensive process and equipment for producing starch through enzymolysis of corn in high proportion Download PDFInfo
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- CN102433369B CN102433369B CN2011103499713A CN201110349971A CN102433369B CN 102433369 B CN102433369 B CN 102433369B CN 2011103499713 A CN2011103499713 A CN 2011103499713A CN 201110349971 A CN201110349971 A CN 201110349971A CN 102433369 B CN102433369 B CN 102433369B
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/50—Improvements relating to the production of bulk chemicals
- Y02P20/52—Improvements relating to the production of bulk chemicals using catalysts, e.g. selective catalysts
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- Enzymes And Modification Thereof (AREA)
Abstract
The invention belongs to the technical field of enzyme fermentation, and provides a method for deep processing corn through enzymolysis. The method comprises a step of adding acid-resistant cellulase in a high proportion into an aqueous solution of sulphurous acid, so that the production efficiency of deep processing the corn can be improved. In addition, the invention also provides a method for preparing corn starch through enzymolysis, acid-resistant cellulase, a desulfurization treatment system and the like.
Description
Invention field
The invention belongs to the enzymic fermentation technical field, particularly, the present invention relates to the composite technology flow process of enzymolysis Maize Production starch and used equipment wherein.
Technical background
Corn is one of staple food crop in the world, and China's corn yield is about 100,000,000 tons.The part of corn most worthy is its seed.The surface coverage of seed cortex, is plumule and endosperm below cortex, and wherein the plumule oleaginousness is high, and toughness is strong; And the skin of endosperm is wrapped in aleurone layer (slag crust), and the inside is full of starch granules.The maize kernel nutritive ingredient is abundant, except starch, also comprises protein, grease, Mierocrystalline cellulose, soluble sugar, mineral substance etc.
In order effectively to utilize each nutritive ingredient in the corn, what mostly adopt in the present domestic W-Gum processing is as shown in Figure 1 comprehensive process flow process, obtains respectively corn steep liquor, maize germ and germ oil, zein fiber, zein and W-Gum by each operation.These operations and equipment thereof are except form of presentation slightly the difference, the introduction of detailed content is arranged in Chinese patent 02144742 and Chinese patent application 200510135112, and these two patent documentations have also elaborated the recycle of waste water in the technique, but to soaking technology and dry after exhaust gas emission and comprehensive utilization aspect do not enlighten to some extent.
In said process, step at first is to soak, and is about in about 0.3% (w/w) sulfurous acid aqueous solution of maize kernel about 50 ℃ Dipping about 72 hours.This step is most important concerning abundant separating corn slurry and other products, but owing to used sulfurous acid, causes in the liquids and gases in subsequent step and inevitably can produce the sulfur dioxide pollution thing.For this reason, Chinese patent application 200810051296 discloses the immersion process in a kind of new production of corn starch, and soaking corn in pressurized environment has wherein used proteolytic enzyme and the cellulase of high density in the soak solution.The characteristics of the method are not use nor can use sulfurous acid to soak, because wherein the proteolytic enzyme of employed market sale and cellulase just have high reactivity in the neutral and even alkaline environment of pH, the very low and even forfeiture of activity in having added the pH sour environment of sulfurous acid, thereby it has the advantage that reduces sulfur dioxide pollution and soak time weak point.
But, the method also has following shortcoming: soaking needs to use pressurizing vessel, this tests for the testing laboratory that carries out with the 10L scale in this patent application is feasible, but now in the plant produced easily in the Dipping tank of ton, almost can't be transformed into pressurizing vessel, need all to change, cost is high and caused the waste of original steeping tank; The operation and maintenance cost that pressurization needs is higher, and Duo an accident potential than the normal pressure operation after the pressurization, i.e. aging along with equipment, and pressurization can cause the blast of pressurized vessel, this also is not easy to promote for keeping the safety in production by today of pay attention to day by day; The large usage quantity of use therein proteolytic enzyme, cost is higher, and this is long-term running cost; Wherein used proteolytic enzyme, causing protein degradation is that water-soluble polypeptide and amino acid run off, thereby so that follow-up corn protein output significantly reduces, has greatly reduced the output of the product of a fairly high profit.In addition, although the method soak time is short, because present domestic W-Gum processing industry is generally in remote districts, the place abundance, the Dipping tank is cheap and be easy to safeguard in addition, has generally adopted a large amount of steeping tank parallel runnings to overcome the long shortcoming of soak time at present.
The inventor is through long-term research and in conjunction with the practice of present domestic W-Gum processing industry, find that the existing corn deep processing technology that adopts sulfurous acid to soak all only focuses on the sulfurous gas of administering in the liquid, and the no matter processing of plumule, the preparation of albumen, or the final finished product of starch that obtains, all need drying machine dry, the gas that drying evaporates contains more sulfurous gas and is excluded contaminate environment, thereby invented one and overlapped new technical scheme, in the situation of the equipment such as steeping tank that need not to change present use, at first, the a high proportion of acid-proof fibre element enzyme that in immersion process, has used the inventor to find, can effectively reduce the usage quantity of sulfurous acid in the immersion process, further reduce the time of required immersion, improved production efficiency; Secondly, keeping soaking in the situation of effect, reducing the content of sulfurous gas in the dry gas that evaporates; Again, collect the dry gas that evaporates, by the tail gas treatment device of inventor's unitized design, not only so that the heat energy of gas be utilized effectively, and further remove sulfurous gas in the gas, so that the sulfur dioxide concentration in the gaseous emission is lower than the 5mg/ cubic meter.
Summary of the invention
The object of the present invention is to provide the method for new enzymolysis corn deep processing, it is in the situation of using Dipping equipment, by adding new acid-proof fibre element enzyme, reduced the consumption of sulfurous acid, control the generation of sulfur dioxide gas from the source, and added new dried tail gas treatment facility, not only taken full advantage of the heat energy of tail gas, and basically eliminate sulfurous gas in the tail gas, so that environmentally friendly.In addition, the present invention also provides new acid-proof fibre element enzyme and new dried tail gas treatment facility.
Particularly, aspect first, the invention provides the method for enzymolysis corn deep processing, it is included in the sulfurous acid aqueous solution maize kernel that soaks behind the removal of contamination and soak solution is become corn steep liquor through evaporator evaporation, corase grind is broken to be soaked the solids that obtains and will roughly grind the plumule that fragmentation goes out and wash successively, dehydration, dry and oil expression is processed, correct grinding is sieved and washed the broken endosperm that goes out of corase grind and is discarded the slag crust that correct grinding is sieved and washed out, separating correct grinding through separating machine sieves and washes the coarse starch milk that obtains and thereby isolated gluten water concentrate and dry acquisition protein powder successively, and isolated starch washed successively, thereby dehydration and the dry finished product of starch that obtains, it is characterized in that
Following (a) or the element of acid-proof fibre (b) enzyme that add high add-on in the described sulfurous acid aqueous solution,
(a) cellulase that is formed by the aminoacid sequence shown in the SEQ ID NO:2;
(b) aminoacid sequence in above-mentioned (a) is through replacing, lack and/or adding one or several amino acid and the acid proof cellulase that obtains;
With, arbitrary, any combination of described drying step or whole tail gas that evaporates are processed through desulfurization.Preferably wherein, thus described isolated starch is washed successively, dewaters and the dry process that obtains finished product of starch in the tail gas that evaporates of drying step process without desulfurization.Because the adding of acid-proof fibre element enzyme, although what intermediate steps produced still can contain more sulfurous gas, thus isolated starch washed successively, dewaters and the process of dry acquisition finished product of starch in the sulfur dioxide in tail gas that produces considerably less.
In this article, the processing of waste water can be carried out according to the disclosed patent documentation of background technology part.Yet, can be used for the processing that industrial prior art has only been enlightened sulfur dioxide pollution thing in the waste water that corn deep processing is produced, there is not research and practice that the sulfur dioxide pollution thing in the waste gas is processed problem.And the inventor is through studying for a long period of time and putting into practice discovery, in steeping tank, soak, as long as steeping tank seal, with regard to Exhaust Gas outward not, even blow-by, the tail gas that also steeping tank can be discharged directly pass into desulfurization in the thionizer of desulfurization treatment system of the present invention by pipeline; Other are except the tail gas that drying step produces, miscellaneous part if not the sealing, because temperature is low, tail gas slow evaporation and quantity is few, tail gas also can directly pass into desulfurization in the thionizer of desulfurization treatment system of the present invention by pipeline, and just because direct evaporation contains the soak solution of sulfurous acid, sulfurous gas is dense in the water vapour of evaporator evaporation, it is too many that direct desulfurization does not lose sulfurous acid, therefore usually flows into steeping tank by back of pipeline after condensation; But the tail that produces in the drying step is large-minded, but and the dry sulfur dioxide in tail gas that evaporates do not reach the content that Efficient Cycle utilizes.
Therefore, the inventor at first by add new acid-proof fibre element enzyme in immersion process, effectively reduces the usage quantity of sulfurous acid, and has reduced the time of soaking; And, in the situation that does not reduce quality product and output, reduced the content of sulfur dioxide in tail gas; In addition, process the sulfurous gas that further removes in the tail gas by desulfurization, reach eco-friendly effect.Because the content of sulfur dioxide in tail gas reduces from the source, so the running cost of desulfurization in processing reduced, and just reduced such as the consumption such as alkali lye such as NaOH solution.
In this article, arbitrary, any combination or whole tail gas that evaporates of drying step refer to, the broken plumule that goes out of corase grind washs successively, dewaters, in dry and the process that oil expression is processed, isolated gluten water concentrate successively and dry process in, and isolated starch washs successively, dewaters and dry process in, any one, the tail gas that evaporates of the drying step in two or all processes.Isolated starch wash successively, dewater and dry process in, the sulfur dioxide in tail gas content that drying evaporates has been lower than some very strict emission standards, therefore can process without desulfurization.Therefore, in the present invention, arbitrary, any combination or whole tail gas that evaporates of drying step preferably refer to, except isolated starch wash successively, dewater and dry process in the converging of the tail gas that evaporates of the drying step of all the other two processes the tail gas that evaporates of drying step.
Acid-proof fibre of the present invention element enzymic activity is high, and anti-acid environment and produce effects.Although add in high proportion largely upper output and the quality that reduces zein fiber of acid-proof fibre element enzyme, can greatly accelerate soak time the most consuming time in the corn deep processing, enhance productivity.Preferably in the method aspect first of the present invention, the add-on of described acid-proof fibre element enzyme is 20～50IU/g maize kernel, is preferably 25～40IU/g maize kernel, more preferably 28～35IU/g maize kernel.
The adding of acid-proof fibre element enzyme of the present invention can effectively reduce the content of sulfurous acid.Preferably in the method aspect first of the present invention, the concentration of sulfurous acid is 0.1～0.28% (w/w) in the described sulfurous acid aqueous solution, is preferably 0.12～0.2% (w/w), more preferably 0.15～0.18% (w/w).
The equipment that continuity has used at present business enterprise expand at home to use then can significantly reduce improvement cost, also is convenient to popularization of the present invention.Preferably in the method aspect first of the present invention, the pressure of described immersion is normal pressure.Like this, can continue the normal pressure equipment that comprises existing steeping tank that uses.
The adding of acid-proof fibre element enzyme of the present invention can effectively reduce soaks required temperature and time, immersion efficient is provided, and has saved the energy.Preferably in the method aspect first of the present invention, the temperature of described immersion is 38～60 ℃, is preferably 45～55 ℃, more preferably 48～53 ℃.Also preferably in the method aspect first of the present invention, the time of described immersion is 24～48 hours, is preferably 30～40 hours, more preferably 32～38 hours.
Tail gas can directly pass into the thionizer desulfurization, but owing to contain dust in the tail gas, and exhaust temperature is higher, causes easily upstream device aging, and directly entering thionizer will waste energy, and stop up thionizer easily.Therefore, in the method aspect first of the present invention, described desulfurization is processed and is comprised with described tail gas successively vapour pipe and the thionizer by washing tower, blower fan, described vaporizer.Washing tower absorbs dust by spray water.Tail gas enough passes in the vapour pipe of vaporizer through Fan Regulation speed, and soak solution flows through the vapour pipe surface, thereby heating flashes to corn steep liquor with soak solution.Therefore also preferred, described vaporizer will be reduced to from the exhaust temperature of its discharge 30～60 ℃, be preferably 40～55 ℃, more preferably 45～50 ℃.Save energy so more efficiently.
Aspect second, the invention provides following (a) or acid-proof fibre (b) element enzyme,
(a) cellulase that is formed by the aminoacid sequence shown in the SEQ ID NO:2;
(b) aminoacid sequence in above-mentioned (a) is through replacing, lack and/or adding one or several amino acid and the acid proof cellulase that obtains.This enzyme can be used in the method for the present invention aspect first.
Preferred second aspect of the present invention provides the cellulase that is comprised of the aminoacid sequence shown in the SEQ ID NO:2.
Aspect the 3rd, the invention provides the gene of second aspect of code book invention described acid-proof fibre element enzyme.According to the DNA recombinant technology, can easily design gene according to known aminoacid sequence.In the specific embodiment of the present invention, the polynucleotide sequence of preferred described gene is shown in SEQ ID NO:1.
Aspect the 4th, the invention provides the carrier that comprises the described gene of third aspect of the present invention, preferably expression vector.Current had many carrier commercializations, can be with in the described gene delivery system of third aspect of the present invention by conversion, transfection or other gene recombination means.In the specific embodiment of the present invention, preferred carrier is pPICZ α A plasmid, and it is Yeast expression carrier.
Aspect the 5th, the invention provides transform or transfection the host cell of the 4th the described carrier in aspect of the present invention.This host cell can be used for expressing second aspect of the present invention described acid-proof fibre element enzyme.The host cell of the 5th aspect of the present invention is yeast preferably, is more preferably pichia spp, and override is Pichia pastoris GS115.
Aspect the 6th, the invention provides the method for preparing second aspect of the present invention described acid-proof fibre element enzyme, it is included under the suitable condition of expressing, cultivate the 5th described cell in aspect of the present invention, and second aspect of the present invention described acid-proof fibre element enzyme of giving expression to of purifying.
Aspect the 7th, the invention provides the desulfurization treatment system for corn deep processing, it comprises washing tower, blower fan, vaporizer and thionizer, it is characterized in that, described washing tower comprises, what can pass into arbitrary, any combination of drying step in the corn deep processing or whole tail gas that evaporate passes into hole, the spray apertures that can pass into water of condensation, sieve plate, water vent and the venting hole that links to each other by pipeline with the inlet mouth of described blower fan; The air outlet of described blower fan links to each other by pipeline with the inlet mouth of the vapour pipe of described vaporizer; Comprise the air inlet port that links to each other by pipeline with the air outlet of the vapour pipe of described vaporizer with, thionizer, can pass into limbers, water vent and the venting hole of alkali lye.
Preferably in the desulfurization treatment system of the 7th fermentation of the present invention, pass into the hole and be positioned at washing tower lower part, venting hole is positioned at washing tower upper part, is conducive to like this water that tail gas sprays by the sieve plate contact; Spray apertures is preferably placed at the top of washing tower, is conducive to like this water and more effectively contacts with tail gas from top to bottom; Porose on the sieve plate, preferably be evenly distributed with the hole, have in the washing tower in addition one or more (as, two, three, four, five) sieve plate that is arranged in parallel, preferred sieve plate is arranged on the position that passes between hole and the venting hole, evenly falls to more effectively contacting with tail gas thereby be conducive to like this water; And/or, water vent is positioned at washing tower lower part than passing into low position, hole, is preferably placed at the bottom of washing tower, will flood when passing into the hole when the water surface in the washing tower like this, wherein water can be discharged, as be discharged in the described Waste Water Treatment of prior art and go.
Preferably in the desulfurization treatment system of the 7th fermentation of the present invention, the vapour pipe of vaporizer is circuitous shape, is more conducive to like this enlarge contact surface and increases vaporization efficiency.
Preferably in the desulfurization treatment system of the 7th fermentation of the present invention, air inlet port be arranged in thionizer alkali lye (such as, NaOH solution) liquid level below, be preferably placed at thionizer lower part, thereby make tail gas pass through the alkali lye desulfurization; Venting hole be arranged in thionizer alkali lye (such as, NaOH solution) liquid level above, be preferably placed at thionizer upper part, prevent that alkali lye from flowing out from venting hole; And/or water vent is positioned at thionizer lower part, is preferably placed at the bottom of thionizer, about too high at the alkali lye liquid level like this or alkali lye pH value is neutralized into 7 in, expel liquid replenishes alkali lye by the limbers.
The desulfurization treatment system of the 7th aspect of the present invention can be used in the corn deep processing.Therefore, aspect the 8th, the invention provides the application of desulfurization treatment system in the corn deep processing method of the 7th aspect of the present invention, preferably the application in the method for the present invention aspect first.
Beneficial effect of the present invention is: reduce the discharging of sulfurous gas in the gas, and useful to environment; Reduce the consumption of sulfurous acid, reduce cost; Significantly improve the efficient of immersion, save time and the energy; Can technical scale use, except the lower Mierocrystalline cellulose of the output value, do not reduce output and the quality of other products; Can adopt the equipment that Present Domestic enterprise uses, reduce the renewal and renovation of equipment cost, be more convenient for promoting.
For the ease of understanding, below will the present invention be described in detail by concrete drawings and Examples.It needs to be noted that specific examples and accompanying drawing only are in order to illustrate, not consist of limitation of the scope of the invention.Obviously those of ordinary skill in the art can illustrate according to this paper, within the scope of the invention the present invention is made various corrections and change, and these corrections and change are also included in the scope of the present invention.In addition, the present invention has quoted open source literature, and these documents also are in order more clearly to describe the present invention, and their full text content is all included the present invention in and carried out reference, just look like they full text in specification sheets of the present invention repeated description excessively the same.
Description of drawings
Fig. 1 has shown the schema of corn deep processing process.
Fig. 2 has shown the schema of desulfurization treating processes of the present invention.
Fig. 3 has shown the synoptic diagram of desulfurization treatment system of the present invention, wherein, washing tower 1 comprises, the spray apertures 12, sieve plate 13, water vent 14 that pass into hole 11, can pass into water of condensation B that can pass into tail gas A and the venting hole 15 that links to each other by pipeline with the inlet mouth 21 of blower fan 2; The inlet mouth 32 of the air outlet 22 of blower fan 2 and the vapour pipe 31 of vaporizer 3 links to each other by pipeline; And, thionizer 4 comprises the air inlet port 42 that links to each other by pipeline with the air outlet 33 of the vapour pipe 31 of vaporizer 3, can pass into the limbers 42 of alkali lye D, discharge through neutralization and the water vent 43 and the venting hole 44 that is higher than liquid level E of the waste liquid F of environmental sound, it can discharge the waste gas G of environmental sound.
Embodiment
Following this paper will describe invention by specific embodiment.As not specializing part, listed method is implemented in the reference that can quote according to " molecular cloning experiment guide " (third edition) (Cold Spring Harbor laboratory Press), " W-Gum manual industry " handbooks such as (China Light Industry Press) and this paper that those skilled in the art were familiar with.In addition, employed material and facility and parts thereof all can be bought by commercial sources except special instruction is arranged from the market among the embodiment.
Clone and the purifying of embodiment 1 acid-proof fibre element enzyme
According to the long-term strain acid resistance Penicillium notatum (Penicillium purporogenum) that obtains that screens of the inventor, entrust Institute of Microorganism, Academia Sinica to clone the cellulose enzyme gene of polynucleotide sequence shown in SEQ ID NO:1 by commercial sources, the cellulase of its encoding amino acid sequence shown in SEQ ID NO:2, and it is upper and be transformed into Pichia pastoris GS115 strain (can available from Invitrogen company) to be cloned into yeast secreted expression carrier pPICZ α A (can available from Invitrogen company) according to normal frame according to conventional methods, after PCR and order-checking check correctly, return the inventor with expressing positive yeast clone.
According to the explanation of the manufacturer of Invitrogen, yeast clone (single bacterium colony) is inoculated in 25mL BMGH substratum, be cultured to OD600 and reach 5 in 30 ℃, 250rpm jolting.Then centrifugal, abandon supernatant, the yeast body weight is suspended from the 100mL BMMH substratum, cultivate in 30 ℃, 250rpm jolting, during to add final concentration in per 24 hours be the methyl alcohol of 1% (v/v), carried out altogether 3 days.
Then, centrifugal collection supernatant liquor (about 100mL), ice bath adds ammonium sulfate and reaches 80% saturation ratio, ice bath was saltoutd 6 hours, centrifugal 15 minutes of 15000rpm, precipitation heavily is dissolved in 20mL 25mM Bis-tris damping fluid (pH5.5), dialysed overnight in 25mM Bis-tris damping fluid (pH5.5).The liquid of dialysing is splined on Q Sepharose Fast Flow chromatography column (available from GE Healthcare), carry out gradient elution with the Bis-tris damping fluid (pH5.5) that contains 0～0.3M NaCl, collect wherein maximum peak, correct and carry out protein quantification through SDS-PAGE detection molecules amount, obtain thus acid-proof fibre element enzyme liquid.
(can be available from Megazyme International Ireland with the AZCL-HE-Mierocrystalline cellulose of color mark, Ltd.) be suspended in the citrate buffer solution of the different pH values of 0.1M (pH4.0～6.5), be made into the solution that contains AZCL-HE-Mierocrystalline cellulose 0.2% (w/w).The enzyme liquid that adds the different dilution above-mentioned purifying of 2oul in the cellulosic solution of the freshly prepared AZCL-HE-of 200ul, hatched 20 minutes in 50 ℃, 500rpm concussion, then with 3000rpm centrifugal 5 minutes, get the absorbancy at thorough 595nm place between supernatant liquor, take the cellulase standard substance as contrast, calculate enzymic activity.The result is as shown in table 1, shows the acidproof onset of endonuclease capable of the present invention.
Table 1 enzyme of the present invention is to the cellulosic enzymic activity of different pH
| pH | Enzymic activity (IU/mg) |
| 6.5 | 39.8 |
| 5.5 | 127.5 |
| 5.0 | 133.2 |
| 4.5 | 116.7 |
Embodiment 2 enzymolysis corn deep processing processes
As a comparative example, as shown in Figure 1, adopt corn deep processing flow process and the equipment (referring to " W-Gum manual industry ") promoted the use of at home to produce continuously, wherein, the maize kernel of having removed impurity Dipping 72 hours in 0.3% (w/w) sulfurous acid aqueous solution of 50 ℃; Drying step adopts the heat drying step, remains on 75～95 ℃ so that carry out the tail gas of the drying machine discharge of each drying step, collects the tail gas detection that each drying step is discharged, and the result is as follows:
The tail gas sulphur dioxide content 550mg/m of drying step in the plumule treating processes
3± 10%;
The tail gas sulphur dioxide content 430mg/m of drying step in the fiber process process
3± 15%;
The tail gas sulphur dioxide content 730mg/m of drying step in the protein powder course of processing
3± 10%; With
The tail gas sulphur dioxide content 40mg/m of drying step in the starch treating processes
3± 15%.
Though the content of sulfur dioxide of above-mentioned tail gas is lower than the source of pollution Air Pollutant Emission limit value of national standard, but still very high, some is near limit value, long-term discharging will be built seriously corroded so that peripheral steel makes up.
Adopt enzymolysis corn deep processing process of the present invention, its step and device parameter are all basic identical with above-mentioned comparative example, all differences are as follows: wherein, the maize kernel of having removed impurity Dipping 36 hours in 0.175% (w/w) sulfurous acid aqueous solution of 50 ℃, the described aqueous solution contain the purified acid-proof fibre element enzyme of embodiment 1 of 30IU/g maize kernel; Slag crust affects quality because of cellulose degraded, so do not reclaim; The tail gas of drying step directly enters the atmosphere in the starch treating processes, after converging, the tail gas of other drying step passes into desulfurization treatment system shown in Figure 3, thereby by washing tower the time, regulate condensation water quantity exhaust temperature is reduced to 80～85 ℃, thereby in vaporizer, by regulating blower fan air draft speed and soak solution throughput exhaust temperature is reduced to 45～50 ℃, when the liquid pH in the thionizer reached 7, expel liquid also passed into NaOH solution in addition.The germ oil, zein and the finished product of starch that adopt this enzymolysis corn deep processing process to produce are all distinguished without remarkable Quality and yield with the corresponding product that comparative example is produced, and all meet the corresponding product standard.Collect the tail gas of each drying step discharge and the tail gas detection of processing through the desulfurization treatment system, the result is as follows:
The tail gas sulphur dioxide content 320mg/m of drying step in the plumule treating processes
3± 15%;
The tail gas sulphur dioxide content 580mg/m of drying step in the protein powder course of processing
3± 15%;
The tail gas G content of sulfur dioxide 0.3mg/m that the desulfurization treatment system is processed
3± 5%; With
The tail gas sulphur dioxide content 15mg/m of drying step in the starch treating processes
3± 15%.
Therefore, adopt acid-proof fibre element enzyme of the present invention, can significantly reduce the usage quantity of sulfurous acid in the immersion process, and significantly shorten soak time and reduce soaking temperature; And, except the lower product of this output value of Mierocrystalline cellulose, in the situation that does not affect product production and quality, significantly reduce the content of sulfur dioxide in the tail gas that discharges, especially iff producing starch (other intermediate products are processed as liquid debris), then the tail gas sulphur dioxide content in the starch treating processes even be lower than the Residential areas emission standard of European Union can directly discharge.Further combined with using desulfurization treatment system of the present invention, even in each exhaust emissions link of corn deep processing, can both make content of sulfur dioxide be reduced to level at the bottom of the utmost point.
Claims (21)
1. the method for enzymolysis corn deep processing, it is included in the sulfurous acid aqueous solution maize kernel that soaks behind the removal of contamination and soak solution is become corn steep liquor through evaporator evaporation, corase grind is broken to be soaked the solids that obtains and will roughly grind the plumule that fragmentation goes out and wash successively, dehydration, dry and oil expression is processed, correct grinding is sieved and washed the broken endosperm that goes out of corase grind and is discarded the slag crust that correct grinding is sieved and washed out, separating correct grinding through separating machine sieves and washes the coarse starch milk that obtains and thereby isolated gluten water concentrate and dry acquisition protein powder successively, and isolated starch washed successively, thereby dehydration and the dry finished product of starch that obtains, it is characterized in that
The acid-proof fibre element enzyme that adds following (a) of high add-on in the described sulfurous acid aqueous solution,
(a) cellulase that is formed by the aminoacid sequence shown in the SEQ ID NO:2;
With, arbitrary, any combination of described drying step or whole tail gas that evaporates are processed through desulfurization.
2. method claimed in claim 1 is characterized in that, the add-on of described acid-proof fibre element enzyme is 20～50IU/g maize kernel.
3. method claimed in claim 2 is characterized in that, the add-on of described acid-proof fibre element enzyme is 25～40IU/g maize kernel.
4. method claimed in claim 3 is characterized in that, the add-on of described acid-proof fibre element enzyme is 28～35IU/g maize kernel.
5. method claimed in claim 1 is characterized in that, the concentration of sulfurous acid is 0.1～0.28% (w/w) in the described sulfurous acid aqueous solution.
6. method claimed in claim 5 is characterized in that, the concentration of sulfurous acid is 0.12～0.2% (w/w) in the described sulfurous acid aqueous solution.
7. method claimed in claim 6 is characterized in that, the concentration of sulfurous acid is 0.15～0.18% (w/w) in the described sulfurous acid aqueous solution.
8. method claimed in claim 1 is characterized in that, the pressure of described immersion is normal pressure.
9. method claimed in claim 1 is characterized in that, the temperature of described immersion is 38～60 ℃.
10. method claimed in claim 9 is characterized in that, the temperature of described immersion is 45～55 ℃.
11. method claimed in claim 10 is characterized in that, the temperature of described immersion is 48～53 ℃.
12. method claimed in claim 1 is characterized in that, the time of described immersion is 24～48 hours.
13. the described method of claim 12 is characterized in that, the time of described immersion is 30～40 hours.
14. the described method of claim 13 is characterized in that, the time of described immersion is 32～38 hours.
15. method claimed in claim 1 is characterized in that, described desulfurization is processed and is comprised vapour pipe and the thionizer that described tail gas is passed through successively washing tower, blower fan, described vaporizer.
16. the described method of claim 15 is characterized in that, described vaporizer will be reduced to 30～60 ℃ by 75～95 ℃ from the exhaust temperature that pipe bundle drier is discharged.
17. the described method of claim 16 is characterized in that, described vaporizer will be reduced to 40～55 ℃ by 75～95 ℃ from the exhaust temperature that pipe bundle drier is discharged.
18. the described method of claim 17 is characterized in that, described vaporizer will be reduced to 45～50 ℃ by 75～95 ℃ from the exhaust temperature that pipe bundle drier is discharged.
19. be used for the desulfurization treatment system of corn deep processing, it comprises washing tower, blower fan, vaporizer and thionizer, it is characterized in that, described washing tower comprises, what can pass into arbitrary, any combination of drying step in the method for arbitrary described enzymolysis corn deep processing of claim 1 ~ 18 or whole tail gas that evaporate passes into hole, the spray apertures that can pass into water of condensation, sieve plate, water vent and the venting hole that links to each other by pipeline with the inlet mouth of described blower fan; The air outlet of described blower fan links to each other by pipeline with the inlet mouth of the vapour pipe of described vaporizer; Comprise the air inlet port that links to each other by pipeline with the air outlet of the vapour pipe of described vaporizer with, thionizer, can pass into the limbers of alkali lye, water vent and venting hole,
And wherein, pass into the hole and be positioned at washing tower lower part, venting hole is positioned at washing tower upper part; Spray apertures is positioned at the top of washing tower; A plurality of sieve plates that are arranged in parallel are arranged in the washing tower, be evenly distributed with the hole on the sieve plate, sieve plate is arranged on the position that passes between hole and the venting hole; Water vent is positioned at washing tower lower part than passing into low position, hole; The vapour pipe of vaporizer is circuitous shape; Air inlet port is positioned at thionizer lower part; Venting hole is positioned at thionizer upper part; And water vent is positioned at thionizer lower part.
20. the application of the described treatment system of claim 19 in the corn deep processing method.
21. the application of the described treatment system of claim 19 in the arbitrary described method of claim 1～18.
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| CN1792221A (en) * | 2005-12-23 | 2006-06-28 | 鲁洲生物科技（山东）有限公司 | Tech. of closed water circulation in maize starch prodn. process |
| CN101372702A (en) * | 2008-10-21 | 2009-02-25 | 吉林农业大学 | Method for shortening maize immersion time in cornstarch production process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1792221A (en) * | 2005-12-23 | 2006-06-28 | 鲁洲生物科技（山东）有限公司 | Tech. of closed water circulation in maize starch prodn. process |
| CN101372702A (en) * | 2008-10-21 | 2009-02-25 | 吉林农业大学 | Method for shortening maize immersion time in cornstarch production process |
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| Title |
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| 玉米深加工过程中异味气体的来源及其治理措施;王红、汤洁、王筠;《环境保护》;20070710(第13期);第48－50页 * |
| 王红、汤洁、王筠.玉米深加工过程中异味气体的来源及其治理措施.《环境保护》.2007,(第13期),第48－50页. |
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