A method for producing high fructose corn syrup

Abstract

The invention discloses a method for producing fructose-glucose syrup, comprising the following steps: edible starch is liquefied, saccharified, filtered, concentrated, and ion-exchanged once to obtain material A; magnesium sulfate heptahydrate solution is added to material A to obtain material B; material B is passed through a strong base anion exchange resin to obtain material C; magnesium sulfate heptahydrate solution and sodium pyrosulfite solution are added to material C to obtain material D; material D is isomerized through an isomerase column to obtain material E; material E is passed through a strong acid and weak base ion exchange resin complex bed to obtain material F; material F is concentrated to obtain F42 fructose-glucose syrup product. The method for producing fructose-glucose syrup provided by the invention uses a strong base anion exchange resin bed for the production of starch-sugar-glucose syrup, and is used for pH adjustment and refining of syrup fed to the isomerase column, so as to improve the quality of the fructose-glucose syrup product and reduce the production cost of the fructose-glucose syrup.

Description

Technical Field

[0001] The invention belongs to the technical field of sugar processing, and in particular relates to a method for producing fructose-glucose syrup. Background Art

[0002] Fructose syrup is a product made by hydrolysis and isomerization of plant starch. It is an important sweetener. The main product types are F-42, F-55 and F-90. "F" stands for fructose, and the number after it stands for the percentage of fructose content in dry matter. Starch milk is hydrolyzed by enzymatic method to obtain saccharification liquid, which contains 95-97% glucose. Then, glucose isomerase is used to convert part of the glucose into fructose to obtain F-42 fructose syrup product. F-42 fructose syrup is then used as raw material for chromatographic separation to obtain syrup with a fructose content of more than 90%, which is mixed with an appropriate amount of F-42 product to obtain F-55 and F-90 products.

[0003] Zhang Litian's "Starch Sugar" (3rd edition) describes: In order to obtain the best enzyme economic benefits and high-quality syrup, the pH of the feed should be selected at 7.5-8.0 (measured at 25°C) based on the purity of the feed syrup. Impure feed will catalyze the decomposition of glucose and fructose into byproducts such as acid, resulting in low output pH. The pH reading of the output should be avoided below 7.0 (measured at 25°C). Milder buffers Na2CO3 and NaHCO3 can help control the pH of the feed syrup. Using Na2CO3 to adjust the pH of the isomerization liquid can ensure the buffering effect in most cases.

[0004] After the glucose syrup is refined by ion exchange resin, magnesium sulfate heptahydrate, sodium metabisulfite and soda ash are added to enter the isomerase column. The syrup discharged from the isomerase column is passed through the ion exchange resin again to remove the above-mentioned added chemicals. By reducing the amount of soda ash added through appropriate process, the sugar passing multiple of the ion exchange resin per cycle of the isomerized syrup can be increased, thereby reducing production costs.

[0005] In the production of starch sugar, strong acid and weak base ion exchange resin complex beds are generally used to refine the syrup. For further refining of the syrup, strong acid and strong base ion exchange resin mixed bed processes are generally used. Strong base resins can remove organic weak acids and 5-hydroxymethyl-2-furfural in the syrup that affect product quality. Since reducing sugars will undergo isomerization and decomposition reactions under alkaline conditions, if used in an inappropriate scenario, OH - The strong base anion exchange resin will cause the syrup to decompose and increase the color, so no OH - Application of single bed of strong base anion exchange resin in starch sugar refining, only OH - A mixed bed in which a strong base anion exchange resin and a strong acid cation exchange resin are mixed in proportion is used for the refining of fructose syrup. The mixed bed has a large investment, low efficiency and high operating cost. Summary of the invention

[0006] In order to reduce the amount of soda ash added to the syrup before isomerization and overcome the problems of large mixed bed investment, low efficiency and high operating cost in the prior art, one of the objects of the present invention is to provide a method for producing high fructose corn syrup, and the second object of the present invention is to provide an application of the method for producing high fructose corn syrup.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is:

[0008] The first aspect of the present invention provides a method for producing high fructose corn syrup, comprising the following steps:

[0009] (1) The edible starch is liquefied, saccharified, filtered, concentrated, and ion-exchanged to obtain material A;

[0010] (2) adding magnesium sulfate heptahydrate solution to material A to adjust the conductivity to obtain material B;

[0011] (3) Material B is subjected to a strong base anion exchange resin to obtain material C;

[0012] (4) adding magnesium sulfate heptahydrate solution and sodium pyrosulfite solution to material C to obtain material D;

[0013] (5) Material D is isomerized through an isomerase column to obtain material E;

[0014] (6) Material E is passed through a strong acid and weak base ion exchange resin bed to obtain material F;

[0015] (7) Material F is concentrated to obtain F42 fructose syrup product.

[0016] Preferably, in the method for producing high fructose corn syrup, the temperature of material A is 35-50°C; further preferably, the temperature of material A is 38-48°C; further preferably, the temperature of material A is 40-45°C.

[0017] Preferably, in the method for producing high fructose corn syrup, the glucose content of material A is ≥92wt%; further preferably, the glucose content of material A is ≥92.5wt%; still further preferably, the glucose content of material A is ≥93.0wt%; further preferably, the glucose content of material A is ≥93.5wt%.

[0018] Preferably, in the method for producing high fructose corn syrup, the conductivity of material A is ≤15 μS / cm; further preferably, the conductivity of material A is ≤14 μS / cm; still further preferably, the conductivity of material A is ≤13 μS / cm; further preferably, the conductivity of material A is ≤12 μS / cm.

[0019] Preferably, in the method for producing high fructose corn syrup, the pH of material A is 3.5-6.5; further preferably, the pH of material A is 4.0-6.5; further preferably, the pH of material A is 4.5-6.0.

[0020] Preferably, in the method for producing high fructose corn syrup, the dry matter concentration of material A is 42-52 wt %; further preferably, the dry matter concentration of material A is 45-50 wt %.

[0021] Preferably, in the method for producing high fructose corn syrup, the conductivity of material B is 15-35 μS / cm; further preferably, the conductivity of material B is 20-30 μS / cm.

[0022] Preferably, in the method for producing high fructose corn syrup, the strong base anion exchange resin is connected in series with a secondary column, when the pH value of the secondary column output is less than 7.8, the primary column is regenerated, the secondary column becomes the primary column, and the regenerated column is activated as the secondary column; the strong base anion exchange resin is OH - Type strong base anion exchange resin; further preferably, the resin is regenerated using a sodium hydroxide solution; further preferably, the resin is regenerated using a 4-6wt% sodium hydroxide solution.

[0023] Preferably, in the method for producing high fructose corn syrup, in step (3), the temperature of material B before passing through the strong base anion exchange resin is 30-45°C; further preferably, the temperature of material B before passing through the strong base anion exchange resin is 35-40°C.

[0024] Preferably, in the method for producing high fructose corn syrup, the pH of material C is 7.6-8.5; further preferably, the pH of material C is 7.8-8.4; further preferably, the pH of material C is 7.8-8.3.

[0025] The present invention reduces the amount of soda used for adjusting the pH of isomerized feed syrup by using a strong base anion exchange resin, and glucose syrup to which a portion of magnesium sulfate heptahydrate is added in advance passes through the strong base anion exchange resin, and anions such as sulfate are exchanged to release OH - , the pH of glucose syrup is increased from 3.5-6.5 to 7.6-8.5, thereby reducing the amount of soda ash used to adjust the pH of the syrup fed into the isomerase column by more than 30%.

[0026] Preferably, in the method for producing high fructose corn syrup, in step (4), the content of magnesium sulfate heptahydrate in material D is 0.60-0.90 g / L, and the content of sulfur dioxide in material D is 70-120 mg / L; further preferably, the content of magnesium sulfate heptahydrate in material D is 0.65-0.90 g / L, and the content of sulfur dioxide in material D is 80-110 mg / L; further preferably, the content of magnesium sulfate heptahydrate in material D is 0.70-0.85 g / L, and the content of sulfur dioxide in material D is 80-100 mg / L.

[0027] Preferably, in the method for producing high fructose corn syrup, in step (5), the pH of material D before passing through the isomerase column is 7.4-8.2; further preferably, the pH of material D before passing through the isomerase column is 7.5-8.0; when material D does not meet the pH condition before passing through the isomerase column, a 4-6wt% soda solution is used to adjust the pH.

[0028] Preferably, in the method for producing high fructose corn syrup, in step (5), the temperature of material D before passing through the isomerase column is 48-62°C; further preferably, the temperature of material D before passing through the isomerase column is 49-61°C; still further preferably, the temperature of material D before passing through the isomerase column is 50-60°C; the isomerase column is loaded with immobilized isomerase, and the glucose in the material is converted into fructose through the isomerization action of the isomerase.

[0029] Preferably, in the method for producing high fructose corn syrup, in step (5), the temperature inside the isomerase column is controlled to be 50-60° C., and the fructose content of the discharge is controlled by adjusting the discharge flow rate to obtain high fructose corn syrup with a fructose content of 42-44 wt %.

[0030] Preferably, in the method for producing high fructose corn syrup, the temperature of material E before passing through the strong acid and weak base ion exchange resin bed is 35-50°C; further preferably, the temperature of material E before passing through the strong acid and weak base ion exchange resin bed is 38-48°C; further preferably, the temperature of material E before passing through the strong acid and weak base ion exchange resin bed is 40-45°C.

[0031] Preferably, in the method for producing high fructose corn syrup, the conductivity of material F is ≤10 μS / cm; further preferably, the conductivity of material F is ≤9 μS / cm; further preferably, the conductivity of material F is ≤8 μS / cm.

[0032] The second aspect of the present invention provides application of the above-mentioned method for producing high fructose corn syrup in preparing high fructose corn syrup from starchy raw materials.

[0033] The beneficial effects of the present invention are:

[0034] The method for producing fructose-glucose syrup provided by the present invention creatively uses a strong base anion exchange resin for the production of starch-sugar-glucose syrup and for pH adjustment and purification of syrup fed to an isomerase column; the specific beneficial effects are as follows:

[0035] 1. The ion exchange production cycle of glucose syrup after isomerization is extended, and the production cost is reduced. Some magnesium sulfate heptahydrate is added to the glucose syrup before entering the isomerase column. The syrup containing magnesium sulfate passes through the strong base anion exchange resin, and the anions such as sulfate are replaced by the strong base resin ion exchange to produce OH - The pH of glucose syrup was increased from 3.5-6.5 to 7.6-8.5, and then magnesium sulfate heptahydrate and sodium metabisulfite were added. The amount of soda ash used to adjust the pH of the syrup fed into the isomerase column was reduced by more than 30%, and the production capacity of the strong acid and weak base ion exchange resin complex bed after isomerization was increased by more than 25%.

[0036] 2. Increased isomerase production capacity and reduced production costs. The use of strong base anion exchange resin further purifies the syrup, reduces the contamination of isomerase by syrup impurities, extends the isomerase production cycle, and increases the isomerase column production capacity by more than 19%.

[0037] 3. Improved product quality. The use of strong base anion exchange resin can absorb organic weak acids and 5-hydroxymethyl-2-furfural in the syrup that affect product quality, thereby improving the quality of high fructose corn syrup products, and the color of the syrup is not easy to increase during storage. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below through specific examples. Unless otherwise specified, the materials and reagents used in the examples and comparative examples are commercially available.

[0039] Example 1

[0040] A method for producing high fructose corn syrup comprises the following steps:

[0041] (1) preparing syrup: edible corn starch is subjected to liquefaction, saccharification, filtration, concentration, and primary ion exchange (strong acid and weak base ion exchange resin multiple bed) to obtain glucose syrup, wherein the glucose content is ≥93.5wt%, the glucose syrup temperature is 40-45°C, the conductivity is 4-10μS / cm, the pH is 4.5-6.0, and the dry matter concentration is 50wt%, to obtain material A;

[0042] (2) primary batching: adding magnesium sulfate heptahydrate solution to material A obtained in step (1) online to meet the syrup conductivity of 20-25 μS / cm, to obtain material B;

[0043] (3) Secondary ion exchange: Material B obtained in step (2) is passed through a strong base anion exchange resin (DuPont FPA900UPS, USA), the feed syrup temperature is controlled at 35°C, and the discharge pH is 7.8-8.3, to obtain material C; the strong base anion exchange resin is connected in series as a secondary column, and when the discharge pH of the secondary column is lower than 7.8, the primary column is regenerated, the secondary column becomes the primary column, and the regenerated column is activated as the secondary column;

[0044] (4) Secondary batching: adding 0.65 g / L magnesium sulfate heptahydrate to the material C obtained in step (3) online, and adding sodium metabisulfite solution in an amount sufficient to ensure that the syrup contains 80-100 ppm of sulfur dioxide, to obtain material D;

[0045] (5) pH adjustment: 5 wt % pure alkali solution was added online to the material D obtained in step (4) to fine-tune the pH to obtain material E with a pH of 7.6-7.8;

[0046] (6) Isomerization: The material E obtained in step (5) is heated to 55° C. and enters the isomerase column (filled with GENSWEETIGI-HF), the temperature in the column is controlled at 55° C., and the fructose content of the discharge is controlled by adjusting the discharge flow rate to obtain a fructose syrup F with a fructose content of 42-44 wt %;

[0047] (7) Tertiary ion exchange: Material F obtained in step (6) is passed through a strong acid and weak base ion exchange resin bed, with the feed syrup temperature at 40-45° C. and the discharge conductivity at <8 μS / cm, to obtain material G;

[0048] (8) Concentration: The material G obtained in step (7) is concentrated to obtain the finished product F42 fructose syrup.

[0049] Example 2

[0050] A method for producing high fructose corn syrup comprises the following steps:

[0051] (1) preparing syrup: edible corn starch is subjected to liquefaction, saccharification, filtration, concentration, and primary ion exchange (strong acid and weak base ion exchange resin multiple bed) to obtain glucose syrup, wherein the glucose content is ≥93.5wt%, the glucose syrup temperature is 40-45°C, the conductivity is 6-12μS / cm, the pH is 4.0-6.0, and the dry matter concentration is 45wt%, to obtain material A;

[0052] (2) primary batching: adding magnesium sulfate heptahydrate solution to material A obtained in step (1) online to meet the syrup conductivity of 20-25 μS / cm, to obtain material B;

[0053] (3) Secondary ion exchange: Material B obtained in step (2) is passed through a strong base anion exchange resin (DuPont FPA900UPS, USA), the feed syrup temperature is controlled at 40°C, and the discharge pH is 7.8-8.3, to obtain material C; the strong base anion exchange resin is connected in series as a secondary column, and when the discharge pH of the secondary column is lower than 7.8, the primary column is regenerated, the secondary column becomes the primary column, and the regenerated column is activated as the secondary column;

[0054] (4) Secondary batching: adding 0.65 g / L magnesium sulfate heptahydrate to the material C obtained in step (3) online, and adding sodium metabisulfite solution in an amount sufficient to ensure that the syrup contains 80-100 ppm of sulfur dioxide, to obtain material D;

[0055] (5) pH adjustment: 5 wt % pure alkali solution was added online to the material D obtained in step (4) to fine-tune the pH to obtain material E with a pH of 7.6-7.8;

[0056] (6) Isomerization: The material E obtained in step (5) is heated to 58° C. and enters the isomerase column (filled with GENSWEETIGI-HF), the temperature in the column is controlled at 60° C., and the fructose content of the discharge is controlled by adjusting the discharge flow rate to obtain a fructose syrup F with a fructose content of 42-44 wt %;

[0057] (7) Tertiary ion exchange: Material F obtained in step (6) is passed through a strong acid and weak base ion exchange resin bed, with the feed syrup temperature at 40-45° C. and the discharge conductivity at <8 μS / cm, to obtain material G;

[0058] (8) Concentration: The material G obtained in step (7) is concentrated to obtain the finished product F42 fructose syrup.

[0059] Example 3

[0060] A method for producing high fructose corn syrup comprises the following steps:

[0061] (1) preparing syrup: edible corn starch is subjected to liquefaction, saccharification, filtration, concentration, and primary ion exchange (strong acid and weak base ion exchange resin multiple bed) to obtain glucose syrup, wherein the glucose content is ≥93.5wt%, the glucose syrup temperature is 40-45°C, the conductivity is 10-15μS / cm, the pH is 3.5-6.0, and the dry matter concentration is 45wt%, to obtain material A;

[0062] (2) primary batching: adding magnesium sulfate heptahydrate solution to material A obtained in step (1) online to meet the syrup conductivity of 25-30 μS / cm, to obtain material B;

[0063] (3) Secondary ion exchange: Material B obtained in step (2) is passed through a strong base anion exchange resin (DuPont FPA900UPS, USA), the feed syrup temperature is controlled at 45°C, and the discharge pH is 7.8-8.5 to obtain material C; the strong base anion exchange resin is connected in series as a secondary column, and when the discharge pH of the secondary column is lower than 7.8, the primary column is regenerated, the secondary column becomes the primary column, and the regenerated column is activated as the secondary column;

[0064] (4) Secondary batching: adding 0.65 g / L magnesium sulfate heptahydrate to the material C obtained in step (3) online, and adding sodium metabisulfite solution in an amount sufficient to ensure that the syrup contains 80-100 ppm of sulfur dioxide, to obtain material D;

[0065] (5) pH adjustment: 5 wt % pure alkali solution was added online to the material D obtained in step (4) to fine-tune the pH to obtain material E with a pH of 7.6-7.8;

[0066] (6) Isomerization: The material E obtained in step (5) is heated to 60° C. and enters the isomerase column (filled with GENSWEETIGI-HF), the temperature in the column is controlled at 60° C., and the fructose content of the discharge is controlled by adjusting the discharge flow rate to obtain a fructose syrup F with a fructose content of 42-44 wt %;

[0067] (7) Tertiary ion exchange: Material F obtained in step (6) is passed through a strong acid and weak base ion exchange resin bed, with the feed syrup temperature at 40-45° C. and the discharge conductivity at <8 μS / cm, to obtain material G;

[0068] (8) Concentration: The material G obtained in step (7) is concentrated to obtain the finished product F42 fructose syrup.

[0069] Comparative Example 1

[0070] A method for producing high fructose corn syrup comprises the following steps:

[0071] (1) preparing syrup: edible corn starch is subjected to liquefaction, saccharification, filtration, concentration, and primary ion exchange (strong acid and weak base ion exchange resin multiple bed) to obtain glucose syrup, wherein the glucose content is ≥93.5wt%, the glucose syrup temperature is 40-45°C, the conductivity is 4-10μS / cm, the pH is 4.5-6.0, and the dry matter concentration is 50wt%, to obtain material A;

[0072] (2) Ingredients: Add 0.75 g / L of magnesium sulfate heptahydrate to the material A obtained in step (1) online, and add sodium metabisulfite solution online in an amount such that the syrup contains 80-100 ppm of sulfur dioxide;

[0073] (3) pH adjustment: 5 wt % pure alkali solution was added online to the material obtained in step (2) to adjust the pH to 7.6-7.8;

[0074] (4) Isomerization: The material obtained in step (3) is heated to 55° C. and enters the isomerase column (filled with GENSWEET IGI-HF), the temperature in the column is controlled at 55° C., and the fructose content of the discharge is controlled by adjusting the discharge flow rate to obtain a fructose syrup F with a fructose content of 42-44 wt %;

[0075] (5) Secondary ion exchange: The fructose-glucose syrup F obtained in step (4) is passed through a strong acid and weak base ion exchange resin bed, the feed syrup temperature is 40-45° C., and the discharge conductivity is less than 8 μS / cm, to obtain material G;

[0076] (6) Concentration: The material G obtained in step (5) is concentrated to obtain the finished product F42 fructose syrup.

[0077] Comparative Example 2

[0078] A method for producing high fructose corn syrup comprises the following steps:

[0079] (1) preparing syrup: edible corn starch is subjected to liquefaction, saccharification, filtration, concentration, and primary ion exchange (strong acid and weak base ion exchange resin multiple bed) to obtain glucose syrup, wherein the glucose content is ≥93.5wt%, the glucose syrup temperature is 40-45°C, the conductivity is 6-12μS / cm, the pH is 4.0-6.0, and the dry matter concentration is 45wt%, to obtain material A;

[0080] (2) Ingredients: Add 0.75 g / L of magnesium sulfate heptahydrate to the material A obtained in step (1) online, and add sodium metabisulfite solution online in an amount such that the syrup contains 80-100 ppm of sulfur dioxide;

[0081] (3) pH adjustment: 5 wt % pure alkali solution was added online to the material obtained in step (2) to adjust the pH to 7.6-7.8;

[0082] (4) Isomerization: The material obtained in step (3) was heated to 58° C. and entered into an isomerase column (filled with GENSWEET IGI-HF), the temperature in the column was controlled at 60° C., and the fructose content of the discharge was controlled by adjusting the discharge flow rate to obtain a fructose syrup F with a fructose content of 42-44 wt %;

[0083] (5) Secondary ion exchange: The fructose-glucose syrup F obtained in step (4) is passed through a strong acid and weak base ion exchange resin bed, the feed syrup temperature is 40-45° C., and the discharge conductivity is less than 8 μS / cm, to obtain material G;

[0084] (6) Concentration: The material G obtained in step (5) is concentrated to obtain the finished product F42 fructose syrup.

[0085] Glucose syrup was isomerized by the methods of Examples 1-3 and Comparative Examples 1-2 to obtain F42 fructose syrup, and the 5-hydroxymethyl-2-furfural content of the fructose syrup discharged from the isomerase column was measured, and the results were shown in Table 1; the fructose syrup discharged from the isomerase column was further ion exchanged and concentrated to obtain a finished F42 fructose syrup, and the 5-hydroxymethyl-2-furfural content of the obtained F42 fructose syrup was measured, and the results were shown in Table 2; the chroma of the obtained F42 fructose syrup product and the chroma after storage for 3 months (using the RBU method) were measured, and the results were shown in Table 3; the isomerase production capacity and the ion exchange oversugar multiple after isomerization were counted, and the results are shown in Table 4.

[0086] Table 1 Comparison of the quality of the isomerase column output of Examples 1-3 and Comparative Examples 1-2

[0087]

[0088] Table 2 Comparison of the quality of the finished product of F42 fructose syrup of Examples 1-3 and Comparative Examples 1-2

[0089]

[0090] Table 3 Storage quality of finished F42 fructose syrup of Examples 1-3 and Comparative Examples 1-2

[0091]

[0092] Table 4 Production capacity data of Examples 1-3 and Comparative Examples 1-2

[0093]

[0094] It can be seen from Table 1 that the 5-hydroxymethyl-2-furfural content of the high fructose syrup discharged from the isomerase column obtained by the high fructose syrup production method provided in Example 1-3 is lower than the 5-hydroxymethyl-2-furfural content of the high fructose syrup obtained in Comparative Example 1-2, indicating that the quality of the high fructose syrup obtained by the high fructose syrup production method provided in Example 1-3 is better than that of Comparative Example 1-2.

[0095] It can be seen from Table 2 that the 5-hydroxymethyl-2-furfural content of the finished F42 fructose syrup of Example 1-3 is lower than the 5-hydroxymethyl-2-furfural content of the syrup obtained in Comparative Example 1-2, indicating that the quality of the finished fructose syrup obtained by the fructose syrup production method provided by Example 1-3 is better than that of Comparative Example 1-2.

[0096] It can be seen from Table 3 that the chromaticity of the finished product F42 fructose syrup of Example 1-3 after storage for 3 months is lower than the chromaticity of the syrup obtained in Comparative Example 1-2, indicating that the quality of the finished product of fructose syrup obtained by the fructose syrup production method provided by Example 1-3 is better than that of Comparative Example 1-2.

[0097] As can be seen from Table 4, the production method of high fructose syrup provided in Examples 1-3 is used to produce F42 high fructose syrup, and the isomerase production capacity is higher than that of Comparative Examples 1-2, and the ion exchange sugar multiple after isomerization is higher than that of Comparative Examples 1-2, indicating that the production method of high fructose syrup provided in Examples 1-3 can improve the isomerase production capacity and the ion exchange sugar multiple after isomerization. The use of strong base resin further purifies the syrup, reduces the irreversible contamination of syrup impurities to isomerase, prolongs the production cycle of isomerase, and increases the production capacity of isomerase from 15000kg sugar / kg dry enzyme to 18000kg sugar / kg dry enzyme, thereby reducing production costs.

[0098] In summary, compared with the conventional isomerization production method, the starch fructose syrup production method of the present invention has improved qualities of 5-hydroxymethyl-2-furfural and the like of the F42 fructose product, improved quality of the fructose syrup, and less chromaticity increase during storage; the production capacity of the isomerase is increased by more than 19%, the exchange capacity of the ion exchange resin after isomerization is increased by more than 25%, and the production cost of the fructose syrup is reduced.

[0099] The above is a detailed description of the embodiments of the present invention, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the present invention. In addition, the embodiments of the present invention and the features in the embodiments can be combined with each other without conflict.

Claims

1. A method for producing high fructose corn syrup, characterized in that: The following steps are involved: (1) The edible starch is liquefied, saccharified, filtered, concentrated, and ion-exchanged to obtain material A; The pH of material A is 3.5-6.5; the conductivity of material A is ≤15 μS / cm; (2) adding magnesium sulfate heptahydrate solution to material A to adjust the conductivity to obtain material B; The electrical conductivity of the material B is 15-35 μS / cm; (3) Material B is subjected to a strong base anion exchange resin to obtain material C; The temperature of material B before passing through the strong base anion exchange resin is 30-45°C; the pH of material C is 7.6-8.5; (4) adding magnesium sulfate heptahydrate solution and sodium pyrosulfite solution to material C to obtain material D; (5) Material D is isomerized through an isomerase column to obtain material E; (6) Material E is passed through a strong acid and weak base ion exchange resin bed to obtain material F; (7) Material F is concentrated to obtain F42 fructose syrup product.

2. The method for producing high fructose corn syrup according to claim 1, characterized in that: The strong base anion exchange resin is connected in series as a secondary column. When the pH value of the secondary column output is less than 7.8, the primary column is regenerated, the secondary column becomes the primary column, and the column that has completed the regeneration is activated as the secondary column.

3. The method for producing high fructose corn syrup according to claim 1, characterized in that: The sulfur dioxide content in the material D is 70-120 mg / L.

4. The method for producing high fructose corn syrup according to claim 1, characterized in that: In step (5), the pH of the material D before passing through the isomerase column is 7.4-8.

2.

5. The method for producing high fructose corn syrup according to claim 1, characterized in that: In step (5), the temperature of the material D before passing through the isomerase column is 48-62°C.

6. The method for producing high fructose corn syrup according to claim 1, characterized in that: The electrical conductivity of the material F is ≤10 μS / cm.

7. Use of the method for producing high fructose corn syrup according to any one of claims 1 to 6 in preparing high fructose corn syrup from starchy raw materials.

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