CN115466760A - Preparation method of starch syrup - Google Patents
Preparation method of starch syrup Download PDFInfo
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- CN115466760A CN115466760A CN202210978913.5A CN202210978913A CN115466760A CN 115466760 A CN115466760 A CN 115466760A CN 202210978913 A CN202210978913 A CN 202210978913A CN 115466760 A CN115466760 A CN 115466760A
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- 229920002472 Starch Polymers 0.000 title claims abstract description 56
- 235000019698 starch Nutrition 0.000 title claims abstract description 56
- 239000008107 starch Substances 0.000 title claims abstract description 56
- 239000006188 syrup Substances 0.000 title claims abstract description 44
- 235000020357 syrup Nutrition 0.000 title claims abstract description 44
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- 238000011282 treatment Methods 0.000 claims abstract description 88
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 claims abstract description 40
- 238000000034 method Methods 0.000 claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- 238000005342 ion exchange Methods 0.000 claims abstract description 33
- 238000001914 filtration Methods 0.000 claims abstract description 25
- 239000011347 resin Substances 0.000 claims abstract description 20
- 229920005989 resin Polymers 0.000 claims abstract description 20
- 239000002253 acid Substances 0.000 claims abstract description 16
- 150000001450 anions Chemical class 0.000 claims abstract description 12
- 150000001768 cations Chemical class 0.000 claims abstract description 12
- 239000002002 slurry Substances 0.000 claims description 32
- 229920002261 Corn starch Polymers 0.000 claims description 28
- 239000008120 corn starch Substances 0.000 claims description 28
- 108090000790 Enzymes Proteins 0.000 claims description 23
- 102000004190 Enzymes Human genes 0.000 claims description 23
- 238000002156 mixing Methods 0.000 claims description 21
- 238000001704 evaporation Methods 0.000 claims description 15
- 230000008020 evaporation Effects 0.000 claims description 15
- 239000000843 powder Substances 0.000 claims description 15
- 238000005507 spraying Methods 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 15
- 235000013336 milk Nutrition 0.000 claims description 13
- 239000008267 milk Substances 0.000 claims description 13
- 210000004080 milk Anatomy 0.000 claims description 13
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000047 product Substances 0.000 claims description 10
- 238000012546 transfer Methods 0.000 claims description 10
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 9
- 150000002500 ions Chemical class 0.000 claims description 9
- 239000000049 pigment Substances 0.000 claims description 9
- 239000004382 Amylase Substances 0.000 claims description 8
- 102000013142 Amylases Human genes 0.000 claims description 8
- 108010065511 Amylases Proteins 0.000 claims description 8
- 235000019418 amylase Nutrition 0.000 claims description 8
- 238000010979 pH adjustment Methods 0.000 claims description 8
- 238000004321 preservation Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 7
- 239000000463 material Substances 0.000 claims description 7
- 102000004169 proteins and genes Human genes 0.000 claims description 7
- 108090000623 proteins and genes Proteins 0.000 claims description 7
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 5
- 239000012535 impurity Substances 0.000 claims description 5
- 229910052740 iodine Inorganic materials 0.000 claims description 5
- 239000011630 iodine Substances 0.000 claims description 5
- 238000002834 transmittance Methods 0.000 claims description 5
- 239000007921 spray Substances 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 235000011121 sodium hydroxide Nutrition 0.000 claims description 3
- 108010073178 Glucan 1,4-alpha-Glucosidase Proteins 0.000 claims description 2
- 102100022624 Glucoamylase Human genes 0.000 claims description 2
- 238000001816 cooling Methods 0.000 claims 1
- 238000002347 injection Methods 0.000 abstract description 14
- 239000007924 injection Substances 0.000 abstract description 14
- 239000006260 foam Substances 0.000 abstract description 6
- 238000009835 boiling Methods 0.000 abstract description 5
- 238000011143 downstream manufacturing Methods 0.000 abstract description 5
- 238000005265 energy consumption Methods 0.000 abstract description 5
- 238000003889 chemical engineering Methods 0.000 abstract description 2
- 239000000243 solution Substances 0.000 description 23
- 230000000694 effects Effects 0.000 description 6
- 238000004042 decolorization Methods 0.000 description 5
- 238000005457 optimization Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 230000007062 hydrolysis Effects 0.000 description 3
- 238000006460 hydrolysis reaction Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000796 flavoring agent Substances 0.000 description 2
- 235000019634 flavors Nutrition 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000011534 incubation Methods 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 229920001353 Dextrin Polymers 0.000 description 1
- 239000004375 Dextrin Substances 0.000 description 1
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 235000019425 dextrin Nutrition 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000008103 glucose Substances 0.000 description 1
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920001542 oligosaccharide Polymers 0.000 description 1
- 150000002482 oligosaccharides Chemical class 0.000 description 1
- 238000001556 precipitation Methods 0.000 description 1
- 235000019605 sweet taste sensations Nutrition 0.000 description 1
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- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/14—Preparation of compounds containing saccharide radicals produced by the action of a carbohydrase (EC 3.2.x), e.g. by alpha-amylase, e.g. by cellulase, hemicellulase
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- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
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- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/02—Monosaccharides
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/04—Polysaccharides, i.e. compounds containing more than five saccharide radicals attached to each other by glycosidic bonds
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- C12P19/00—Preparation of compounds containing saccharide radicals
- C12P19/22—Preparation of compounds containing saccharide radicals produced by the action of a beta-amylase, e.g. maltose
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- C—CHEMISTRY; METALLURGY
- C13—SUGAR INDUSTRY
- C13B—PRODUCTION OF SUCROSE; APPARATUS SPECIALLY ADAPTED THEREFOR
- C13B20/00—Purification of sugar juices
- C13B20/14—Purification of sugar juices using ion-exchange materials
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Abstract
The invention relates to the technical field of light industry and chemical engineering biotechnology, in particular to a preparation method of starch syrup, which improves the treatment processes of low-conductivity ion exchange and high-concentration jet liquefaction; in the step of low-conductivity ion exchange treatment, styrene strong-acid cation resin and styrene weak-base anion resin are adopted for ion exchange, so that the ion exchange discharge conductivity is less than or equal to 10 mu s/cm, and the prepared syrup is purer without affecting the taste of the product; the product has no foam, and is convenient for downstream processing and boiling. In the high-concentration jet liquefaction treatment step, high-concentration jet and low-concentration saccharification are adopted. The liquefaction injection concentration is controlled to be 19-20 Baume, the reduced concentration is 38-40%, and high-concentration liquefaction injection is adopted, so that the steam energy consumption is saved; and adding RO water through a saccharification tank to adjust the concentration to 35-36%, thereby facilitating subsequent filtration.
Description
Technical Field
The invention relates to the technical field of light industry and chemical engineering biotechnology, in particular to a preparation method of starch syrup.
Background
Starch syrup, refers to the incomplete hydrolysis product of starch. Is colorless, transparent and viscous liquid. Has good storability and no crystal precipitation, and the sugar component is glucose, oligosaccharide, dextrin, etc. The content ratio of each component is different due to the difference of hydrolysis degree and production process. Can be divided into high, medium and low invert syrup. The starch syrup is a viscous liquid processed after starch hydrolysis and decoloration, has soft sweet taste and is easy to be directly absorbed by human bodies.
In the existing starch syrup preparation process, the design of an ion exchange process is not perfect enough, so that the finally obtained finished syrup has the defects of being not pure enough, having unexpected taste and being easy to generate foam. Secondly, in the step of the injection liquefaction process, energy cannot be well saved due to unreasonable process design.
Therefore, how to provide a method for preparing starch syrup, which has simpler and more reasonable steps, can better improve the quality of finished syrup and can better save energy, becomes a technical problem to be solved by technical personnel in the field.
Disclosure of Invention
In view of the above defects in the prior art, the technical problem to be solved by the present invention is how to provide a method for preparing starch syrup, which has simpler and more reasonable steps, can better improve the quality of the finished syrup, and can better achieve energy saving.
In order to achieve the aim, the invention provides a preparation method of starch syrup, which comprises the steps of preparing and obtaining starch milk by adopting corn starch, and then sequentially carrying out high-concentration spraying liquefaction treatment, maintaining column heat preservation treatment, saccharification treatment, decoloration and filtration treatment, low-conductivity ion exchange treatment, pH adjustment treatment of a transfer tank and MVR evaporation concentration treatment on the obtained starch milk to obtain finished product syrup; the method is characterized in that: in the low-conductivity ion exchange treatment step, secondary ion exchange is adopted, the sugar solution is treated by styrene strong-acid cation resin and styrene weak-base anion resin respectively, and protein, pigment and ions in the sugar solution are removed; and the conductance of the discharged sugar solution in the ion exchange process is less than or equal to 10 mus/cm.
Thus, in the preparation method of the starch syrup, the starch milk is prepared from the corn starch, and then the finished product syrup is obtained through high-concentration spraying liquefaction treatment, maintaining column heat preservation treatment, saccharification treatment, decoloration and filtration treatment, low-conductivity ion exchange treatment, pH adjustment treatment of a transfer tank and MVR evaporation concentration treatment in sequence. The whole process has simple steps and reasonable design. In the low-conductivity ion exchange treatment step, secondary ion exchange is adopted, the sugar solution is treated by styrene strong-acid cation resin and styrene weak-base anion resin respectively, and protein, pigment and ions in the sugar solution are removed; and the conductance of the discharged sugar solution in the ion exchange process is less than or equal to 10 mus/cm. Secondary ion exchange: the method adopts styrene strong acid cation resin and styrene weak base anion resin for ion exchange to remove impurities such as anions and cations, protein, pigment and the like in the sugar solution. The conductance is less than or equal to 10 mus/cm: the sugar solution has few ions and is pure. The syrup can keep the original taste and flavor to the maximum extent, has no foam, and is convenient for downstream processing and boiling.
As optimization, the steps of preparing and obtaining the starch milk by adopting the corn starch comprise starch opening treatment and size mixing treatment.
Therefore, the corn starch is used as a raw material, the starch milk is obtained through starch opening treatment and size mixing treatment, and the method steps are simpler.
In the starch slurry opening treatment step, corn starch is unpacked and poured into a slurry opening tank, water is added to prepare slurry, and the water temperature is less than or equal to 62 ℃; and the concentration is corn starch according to mass ratio: water = 1.35.
Thus, in the starch pulping treatment step, the water temperature is less than or equal to 62 ℃ to prevent excessive gelatinization. Powder: water = 1.35, approximately 42% in concentration, in preparation for subsequent high-concentration liquefaction of 38-40%; the method of adjusting concentration in place at one step is not adopted, so that the concentration can be better adjusted and controlled.
As optimization, in the step of size mixing treatment, slurry obtained by the size mixing treatment of corn starch is conveyed to a size mixing tank, water is added into the size mixing tank for size mixing, and the concentration of the starch slurry is controlled to Be 19-20 degrees Be'; adding 4 percent of food-grade dilute caustic soda to regulate the pH value to 5.4-5.6; adding liquefied amylase, and adding corn starch at an amount of 0.2L/t.
Thus, in the size mixing treatment step, the Baume concentration of 19-20: the reduced concentration is 38-40%, and high-concentration liquefaction injection is adopted, so that the steam energy consumption is further saved. Adjusting the pH value to 5.4-6.5: optimal activity of high-temperature amylase; the addition amount of the liquefying enzyme is 0.2L/t starch: the viscosity is reduced by adding liquefying enzyme, the primary liquefaction is realized, and the effect of 0.2L/t is optimal.
As optimization, in the step of high-concentration jet liquefaction treatment, 95 ℃ water is used for heating the powder slurry to 62 ℃; preheating the ejector to 115 ℃ by using high-temperature steam, and then spraying the slurry, wherein the spraying temperature is controlled to be 116-118 ℃; and adding liquefied amylase into the sprayed powder slurry.
Thus, in the high-concentration jet liquefaction treatment step, the temperature is raised to 62 ℃: after the 62 ℃ water and the slurry are mixed, the temperature is reduced, and the temperature is increased to 62 ℃ again, so that the temperature of the slurry is increased, and the steam for spraying is saved. The injection temperature is 116-118 ℃: at this injection temperature, the liquefaction effect is optimal. Adding a liquefying enzyme: the liquefied enzyme is killed by high-temperature spraying and needs to be supplemented.
As optimization, in the step of maintaining the heat preservation of the column, the laminar flow is maintained for more than 1.0 h; the laminar flow discharging DE is controlled between 18 and 22; the iodine color reaction of the liquefied liquid discharged by laminar flow is non-blue.
Thus, in the step of maintaining the column incubation, the laminar flow time is more than 1.0 h: fully liquefy and increase the DE value. DE is controlled between 18 and 22: the subsequent saccharification is optimal, and both too low and too high a DE value can affect the saccharification DE value. The iodine color reaction of the liquefied liquid is non-blue: indicating that the starch was fully hydrolyzed.
In the saccharification treatment step, laminar flow is maintained, discharged materials are cooled to be below 64 ℃, and then the materials enter a saccharification tank; after the feeding amount in the saccharification tank reaches the stirring lower limit of the stirring equipment, starting stirring, and adding RO water with the water amount of 0.3-0.4 m 3 Water/t corn starch; adding enzyme according to the following proportion of each ton of corn starch: BBA enzymes: complex saccharifying enzyme = 0.05-0.1L: 0-0.02L/ton powder; after the feed of the saccharification tank is finished, stirring is continuously carried out for 30min to fully mix, then stirring is stopped for saccharification, and the DE value of the saccharification liquid is more than or equal to 50, and the saccharification is qualified.
Thus, in the saccharification treatment step, the temperature is reduced by 64 ℃: if the temperature is too high, the saccharifying enzyme is killed. RO water amount is added by 0.3-0.4 m 3 Water/powder t: according to the proportion, the saccharification concentration is 35-36%, which is convenient for subsequent filtration. (the concentration of saccharification is high, and filtration is difficult). BBA enzymes: complex saccharifying enzyme = 0.05-0.1L: 0-0.02L/ton powder: when the enzyme is prepared, the DE value of saccharification can be more than or equal to 50.DE value is more than or equal to 50: the method has the advantages of high saccharification degree and low viscosity, and is more beneficial to customer production.
As optimization, in the steps of decoloring and filtering treatment, a filter aid is added for filtering to remove visible impurities; adding active carbon for decoloring and filtering; and the transmittance of the filtrate is more than or equal to 95 percent.
Thus, in the decolorization and filtration treatment step, a filter aid is added: which helps to increase the filtration rate. Adding activated carbon: is helpful for removing pigment in sugar solution, and is convenient for decolorization. The transmittance of the filtrate is more than or equal to 95%: the sugar solution is filtered to be cleaner.
And optimally, in the pH adjusting treatment step of the transfer tank, the pH of the sugar solution is adjusted, and the adjusted pH is ensured to be between 4.0 and 7.0 in the evaporation, concentration and discharge of MVR in the subsequent process.
Thus, in the transfer tank pH adjustment treatment step, the pH is 4-7: too high pH, easily yellow sugar. Without the addition of acid, the syrup pH will generally be > 4. If the control is lower, only acid can be added, and more acid is added to increase ions, which affects the purity of syrup.
In the MVR evaporation concentration treatment step, concentration, pH and sugar temperature are detected in the evaporation concentration process, the discharging concentration is controlled to be 75.0-76.0%, the pH is controlled to be 4.0-7.0, and the sugar temperature is controlled to be 50-60 ℃.
Thus, in the MVR evaporation concentration treatment step, the concentration is 75.0% -76.0%: has moderate concentration and fluidity, and is convenient for addition and processing. Sugar temperature is 50-60 ℃: the sugar temperature is too low, the viscosity is high, and the syrup fluidity is poor; the sugar is too warm and is easily yellow. Most suitably 50-60 ℃.
In summary, in the steps of the above process, high-concentration spraying and low-concentration saccharification are adopted. The liquefaction injection concentration is controlled to be 19-20 Baume, the reduced concentration is 38-40%, and high-concentration liquefaction injection is adopted, so that the steam energy consumption is saved; and adding RO water to adjust the concentration to 35-36% through a saccharification tank, thereby facilitating subsequent filtration. The method adopts styrene strong acid cation resin and styrene weak base anion resin for ion exchange, so that the ion exchange material conductance is less than or equal to 10 mus/cm, and the prepared syrup is purer without influencing the taste of the product; the product has no foam, and is convenient for downstream processing and boiling.
Drawings
FIG. 1 is a process step diagram of a method of making a starch syrup in accordance with an embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and examples, wherein the terms "upper", "lower", "left", "right", "inner", "outer", and the like, as used herein, refer to an orientation or positional relationship indicated in the drawings, which is for convenience and simplicity of description, and does not indicate or imply that the referenced devices or components must be in a particular orientation, constructed and operated in a particular manner, and thus should not be construed as limiting the present invention. The terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
As shown in fig. 1, a method for preparing starch syrup comprises the steps of preparing starch milk from corn starch, and sequentially subjecting the obtained starch milk to high-concentration spray liquefaction treatment, maintaining column heat preservation treatment, saccharification treatment, decolorization and filtration treatment, low-conductivity ion exchange treatment, pH adjustment treatment in a transfer tank, and MVR evaporation concentration treatment to obtain finished product syrup; in the low-conductivity ion exchange treatment step, secondary ion exchange is adopted, the sugar solution is treated by styrene strong-acid cation resin and styrene weak-base anion resin respectively, and protein, pigment and ions in the sugar solution are removed; and the conductance of the discharged sugar solution in the ion exchange process is less than or equal to 10 mus/cm.
Thus, in the preparation method of the starch syrup, the starch milk is prepared from the corn starch, and then the finished product syrup is obtained through high-concentration spraying liquefaction treatment, maintaining column heat preservation treatment, saccharification treatment, decoloration and filtration treatment, low-conductivity ion exchange treatment, pH adjustment treatment of a transfer tank and MVR evaporation concentration treatment in sequence. The whole process has simple steps and reasonable design. In the low-conductivity ion exchange treatment step, secondary ion exchange is adopted, the sugar solution is treated by styrene strong-acid cation resin and styrene weak-base anion resin respectively, and protein, pigment and ions in the sugar solution are removed; and the conductance of the discharged sugar solution in the ion exchange process is less than or equal to 10 mus/cm. Secondary ion exchange: and (3) performing ion exchange by using styrene strong-acid cation resin and styrene weak-base anion resin to remove impurities such as anions, cations, proteins, pigments and the like in the sugar solution. The electric conductivity is less than or equal to 10 mu s/cm: the sugar solution has few ions and is pure. The syrup can keep the original taste and flavor to the maximum extent, has no foam, and is convenient for downstream processing and boiling.
In the specific embodiment, the step of preparing and obtaining the starch milk by adopting the corn starch comprises starch slurry opening treatment and slurry mixing treatment.
Therefore, the corn starch is used as a raw material, the starch milk is obtained through starch opening treatment and size mixing treatment, and the method steps are simpler.
In the specific embodiment, in the starch slurry opening treatment step, corn starch is unpacked and poured into a slurry opening tank, water is added to prepare slurry, and the water temperature is less than or equal to 62 ℃; and the concentration is corn starch by mass ratio: water = 1.35.
Thus, in the starch pulping treatment step, the water temperature is less than or equal to 62 ℃ to prevent excessive gelatinization. Powder: water = 1.35, approximately 42% in concentration, in preparation for subsequent high-concentration liquefaction of 38-40%; the method of adjusting the concentration in place at one step is not adopted, so that the concentration can be better adjusted and controlled.
In the specific embodiment, in the step of size mixing treatment, slurry obtained by opening corn starch is conveyed to a size mixing tank, water is added into the size mixing tank for size mixing, and the concentration of the starch slurry is controlled to Be 19-20 degrees Be'; adding 4 percent food-grade dilute caustic soda to adjust the pH value to 5.4-5.6; adding liquefied amylase, and adding corn starch at an amount of 0.2L/t.
Thus, in the size mixing treatment step, the Baume concentration of 19-20: the reduced concentration is 38-40%, and high-concentration liquefaction injection is adopted, so that the steam energy consumption is saved. Adjusting the pH value to 5.4-6.5: the best activity of the high-temperature amylase; the addition amount of the liquefying enzyme is 0.2L/t starch: the viscosity is reduced by adding liquefying enzyme, the primary liquefaction is realized, and the effect of 0.2L/t is optimal.
In the specific embodiment, in the high-concentration spray liquefaction treatment step, 95 ℃ water is used for heating the powder slurry to 62 ℃; preheating the ejector to 115 ℃ by using high-temperature steam, and then spraying the powder slurry, wherein the spraying temperature is controlled to be 116-118 ℃; and adding liquefied amylase into the sprayed powder slurry.
Thus, in the high-concentration jet liquefaction treatment step, the temperature is raised to 62 ℃: after the 62 ℃ water and the slurry are mixed, the temperature is reduced, the temperature is increased to 62 ℃ again, the temperature of the slurry is increased, and steam for injection is saved. The injection temperature is 116-118 ℃: at this injection temperature, the liquefaction effect is optimal. And (3) adding a liquefying enzyme: the liquefying enzyme is killed by high-temperature spraying and needs to be supplemented.
In the specific embodiment, in the step of maintaining the heat preservation of the column, the laminar flow maintaining time is more than 1.0 h; the laminar flow discharging DE is controlled between 18 and 22; the iodine color reaction of the liquefied liquid discharged by laminar flow is non-blue.
Thus, in the step of maintaining the column incubation, the laminar flow time is more than 1.0 h: fully liquefy and increase the DE value. DE is controlled between 18 and 22: the subsequent saccharification is optimal, and both too low and too high DE values can affect the saccharification DE value. The iodine color reaction of the liquefied liquid is non-blue: indicating that the starch was fully hydrolyzed.
In the specific embodiment, in the saccharification treatment step, the discharged material is cooled to below 64 ℃ by maintaining laminar flow and then enters a saccharification tank; after the feeding amount in the saccharification tank reaches the stirring lower limit of the stirring equipment, starting stirring, and adding RO water with the water amount of 0.3-0.4 m 3 Water/t corn starch; adding enzyme according to the following proportion of each ton of corn starch: BBA enzymes: complex glucoamylase = 0.05-0.1L: 0 to 0.02L/ton of powder; and after the feed of the saccharification tank is finished, continuously stirring for 30min to fully mix, stopping stirring for saccharification, and determining that the saccharification is qualified if the DE value of the saccharification liquid is more than or equal to 50.
Thus, in the saccharification treatment step, the temperature is reduced by 64 ℃: if the temperature is too high, the saccharifying enzyme is killed. RO water amount is added by 0.3-0.4 m 3 Water/powder t: according to the proportion, the saccharification concentration is 35-36%, which is convenient for subsequent filtration. (the concentration of saccharification is high, and filtration is difficult). BBA enzyme: complex saccharifying enzyme = 0.05-0.1L: 0-0.02L/ton powder: when the enzyme is formulated, the DE value of saccharification can be more than or equal to 50.DE value is more than or equal to 50: the method has the advantages of high saccharification degree and low viscosity, and is more beneficial to customer production.
In the specific embodiment, in the decoloring and filtering treatment steps, a filter aid is added for filtering to remove visible impurities; adding active carbon for decoloring and filtering; and the transmittance of the filtrate is more than or equal to 95 percent.
Thus, in the decolorization and filtration treatment step, a filter aid is added: helping to increase the filtration rate. Adding activated carbon: is helpful for removing pigment in sugar solution, and is convenient for decolorization. The transmittance of the filtrate is more than or equal to 95%: the sugar solution is filtered to be cleaner.
In the specific embodiment, in the pH adjustment processing step of the transfer tank, the pH of the sugar solution is adjusted, and the adjusted pH is required to ensure that the pH of the evaporation, concentration and discharge material of the MVR in the subsequent process is between 4.0 and 7.0.
Thus, in the transfer tank pH adjustment treatment step, the pH is 4-7: too high pH, easily yellow sugar. The pH of the syrup is generally greater than 4 without the addition of acid, and if the pH is controlled to be lower, only acid can be added, so that more acid is added, and more ions are added, thus affecting the purity of the syrup.
In the specific embodiment, in the step of MVR evaporation concentration, pH and sugar temperature are detected in the evaporation concentration process, the discharge concentration is controlled to be 75.0-76.0%, the pH is controlled to be 4.0-7.0, and the sugar temperature is controlled to be 50-60 ℃.
Thus, in the MVR evaporation concentration treatment step, the concentration is 75.0% -76.0%: moderate concentration and fluidity, and convenient addition and processing. Sugar temperature is 50-60 ℃: the sugar temperature is too low, the viscosity is high, and the syrup fluidity is poor; the sugar is too warm and is easily yellow. Most suitably 50-60 ℃.
In summary, in the steps of the above process, high-concentration spraying and low-concentration saccharification are adopted. The liquefaction injection concentration is controlled to be 19-20 Baume, the reduced concentration is 38-40%, and high-concentration liquefaction injection is adopted, so that the steam energy consumption is further saved; and adding RO water to adjust the concentration to 35-36% through a saccharification tank, thereby facilitating subsequent filtration. The method adopts styrene strong acid cation resin and styrene weak base anion resin for ion exchange, so that the conductance of the ion exchange discharge is less than or equal to 10 mu s/cm, and the prepared syrup is purer without affecting the taste of the product; the product has no foam, and is convenient for downstream processing and boiling.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the above teachings. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (10)
1. A preparation method of starch syrup comprises the steps of preparing starch milk by adopting corn starch, and then sequentially carrying out high-concentration spray liquefaction treatment, column heat preservation treatment, saccharification treatment, decoloration and filtration treatment, low-conductivity ion exchange treatment, pH adjustment treatment by a transfer tank and MVR evaporation concentration treatment on the obtained starch milk to obtain finished product syrup; the method is characterized in that: in the low-conductivity ion exchange treatment step, secondary ion exchange is adopted, the sugar solution is treated by styrene strong-acid cation resin and styrene weak-base anion resin respectively, and protein, pigment and ions in the sugar solution are removed; and the conductance of the discharged sugar solution in the ion exchange process is less than or equal to 10 mus/cm.
2. The method of claim 1, wherein the starch syrup is prepared by: the steps of preparing and obtaining the starch milk by adopting the corn starch comprise starch slurry opening treatment and slurry mixing treatment.
3. The method of claim 2, wherein the starch syrup is prepared by: in the starch slurry opening treatment step, corn starch is unpacked and poured into a slurry opening tank, water is added to prepare slurry, and the water temperature is less than or equal to 62 ℃; and the concentration is corn starch according to mass ratio: water = 1.35.
4. The method of claim 2, wherein the starch syrup is prepared by: in the step of size mixing treatment, slurry obtained by the size mixing treatment of the corn starch is conveyed to a size mixing tank, water is added into the size mixing tank for size mixing, and the concentration of the starch slurry is controlled to Be 19-20 degrees Be'; adding 4 percent of food-grade dilute caustic soda to regulate the pH value to 5.4-5.6; adding liquefied amylase, and adding 0.2L/t corn starch.
5. The method of claim 1, wherein the starch syrup is prepared by: in the high-concentration spray liquefaction treatment step, the powder slurry is heated to 62 ℃ by using water with the temperature of 95 ℃; preheating the ejector to 115 ℃ by using high-temperature steam, and then spraying the slurry, wherein the spraying temperature is controlled to be 116-118 ℃; and adding liquefied amylase into the slurry after spraying.
6. The method of claim 1, wherein the starch syrup is prepared by: in the step of maintaining the heat preservation of the column, the laminar flow maintaining time is more than 1.0 h; the laminar flow discharging DE is controlled between 18 and 22; the iodine color reaction of the liquefied liquid discharged by laminar flow is non-blue.
7. The method of claim 1, wherein the starch syrup is prepared by: in the saccharification treatment step, maintaining laminar flow, cooling the discharged material to below 64 ℃, and then feeding the material into a saccharification tank; after the feeding amount in the saccharification tank reaches the stirring lower limit of the stirring equipment, starting stirring, and adding RO water with the water amount of 0.3-0.4 m 3 Water/t corn starch; adding enzyme according to the following proportion of each ton of corn starch: BBA enzyme: complex glucoamylase = 0.05-0.1L: 0 to 0.02L/ton of powder; after the feed of the saccharification tank is finished, stirring is continuously carried out for 30min to fully mix, then stirring is stopped for saccharification, and the DE value of the saccharification liquid is more than or equal to 50, and the saccharification is qualified.
8. The method of claim 1, wherein the starch syrup is prepared by: in the decoloring and filtering treatment steps, a filter aid is added for filtering to remove visible impurities; adding active carbon for decoloring and filtering; and the transmittance of the filtrate is more than or equal to 95 percent.
9. The method of claim 1, wherein the starch syrup is prepared by: and in the pH adjusting treatment step of the transfer tank, the pH of the sugar solution is adjusted, and the adjusted pH is ensured to be between 4.0 and 7.0 when the MVR is evaporated, concentrated and discharged in the subsequent process.
10. The method of claim 1, wherein the starch syrup is prepared by: in the MVR evaporation concentration treatment step, concentration, pH and sugar temperature are detected in the evaporation concentration process, the discharging concentration is controlled to be 75.0-76.0%, the pH is controlled to be 4.0-7.0, and the sugar temperature is controlled to be 50-60 ℃.
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