CN114380925A

CN114380925A - Method for drying corn distillers' grains and extracting soluble polysaccharide

Info

Publication number: CN114380925A
Application number: CN202111644730.1A
Authority: CN
Inventors: 邹传军; 邹佳锐
Original assignee: Wuhan Meiweiyuan Biological Engineering Co ltd
Current assignee: Wuhan Meiweiyuan Biological Engineering Co ltd
Priority date: 2021-12-30
Filing date: 2021-12-30
Publication date: 2022-04-22

Abstract

The invention provides a method for drying corn distillers' grains and extracting soluble polysaccharide, which comprises the following steps: filtering the alcohol residue filtrate by using a membrane to obtain clear liquid and membrane concentrate; performing membrane separation on the clear liquid to obtain a macromolecular polysaccharide component and a micromolecular mixture; treating the macromolecular polysaccharide component to obtain a soluble polysaccharide product; concentrating the small molecule mixture to obtain a high-concentration mixture; and mixing the membrane concentrate and the high-concentration mixture with vinasse and drying to obtain the protein feed. According to the invention, the soluble saccharides in the vinasse filtrate are extracted, so that the Maillard reaction of the saccharides and the amino acid is avoided or reduced, the loss of the amino acid is reduced, the problem of color deepening of the DDGS feed during drying is solved, and the quality of the DDGS feed is greatly improved. In the invention, after soluble polysaccharide in the DDGS feed is extracted, the anti-nutritional factors of the feed are reduced, and the reduction of the absorption capacity of the animal on nutrient components after the animal intakes indigestible polysaccharide is avoided.

Description

Method for drying corn distillers' grains and extracting soluble polysaccharide

Technical Field

The invention relates to the technical field of DDGS feed production, in particular to a method for drying corn distillers' grains and extracting soluble polysaccharide.

Background

At present, alcohol (ethanol) is a very important basic raw material, and is widely used for foods, medicines, fuels, and the like. The production of alcohol mainly uses starch as raw material, and the production process includes the procedures of raw material cooking, saccharifying agent preparation, saccharification, yeast preparation, fermentation and distillation. DDGS (Distillers Dried Grains with Solubles) feed is a trade name for protein feed in Distillers Grains, i.e., Distillers Dried Grains with soluble solids. In the process of preparing ethanol by fermenting corn, starch in the ethanol is converted into ethanol and carbon dioxide, and other nutrient components such as protein, fat, fiber and the like are remained in vinasse.

The filtrate obtained in the DDGS feed production process mainly contains oil, sugar, amino acid, fiber, protein and the like, most of the filtrate is soluble substances, contains a small amount of insoluble fiber and protein, has low concentration of only about 1-5 percent, and produces about 10-15 tons of filtrate per ton of alcohol.

At present, the commonly used DDGS feed production process is to evaporate and concentrate the filtrate to 30-50% concentration, and then directly use the filtrate or mix the filtrate with distillers' grains for drying. Since the concentrated filtrate contains a large amount of oil and fat and cannot be dried, it is necessary to mix the filtrate with distillers' grains and then dry the resulting mixture.

The prior process has the disadvantages that:

1. the evaporation cost is high, the concentration of the vinasse filtrate is from 1-5% to 30-50%, about 10 tons of water needs to be evaporated, 2-3 tons of steam needs to be consumed, a large amount of electric energy needs to be consumed, and the energy consumption is high;

2. the temperature during evaporation is high, and the evaporation is in a vacuum state, a large amount of organic matters can volatilize, the evaporated water can take away a large amount of organic matters, and the COD of the generated sewage is about more than 3000, so that the sewage treatment difficulty is increased;

the color of the DDGS is a very important quality index, because soluble carbohydrate and amino acid exist in the filtrate, when the filtrate is concentrated, Maillard reaction can be generated due to high temperature, a large amount of amino acid is consumed, when the filtrate is concentrated and mixed with vinasse for drying, a large amount of protein contained in the vinasse can also generate Maillard reaction with the soluble carbohydrate, the protein is consumed, the nutritional value of the feed is greatly reduced, and simultaneously, the DDGS protein feed is blackened, and the food calling performance of the product is seriously influenced;

4. soluble carbohydrate in the filtrate is polysaccharide, and the carbohydrate cannot be utilized by animals, and can wrap and carry other nutrient components to influence the absorption of the nutrient components by the animals.

Disclosure of Invention

In view of this, the invention provides a method for drying corn distillers' grains and extracting soluble polysaccharides, and aims to reduce the production cost of DDGS and reduce the soluble polysaccharides in DDGS during DDGS feed production.

In one aspect, the invention provides a method for drying corn distillers' grains and extracting soluble polysaccharide, which comprises the following steps:

filtering the alcohol residue filtrate by using a membrane to obtain clear liquid and membrane concentrate;

performing membrane separation on the clear liquid to obtain a macromolecular polysaccharide component and a micromolecular mixture;

treating the macromolecular polysaccharide component to obtain a soluble polysaccharide product;

concentrating the small molecule mixture to obtain a high-concentration mixture;

and mixing the membrane concentrate and the high-concentration mixture with vinasse and drying to obtain the protein feed.

Further, when the macromolecular polysaccharide component is treated, the soluble polysaccharide product is obtained after the macromolecular polysaccharide component is concentrated, refined, evaporated and dried.

Further, when the macromolecular polysaccharide component is concentrated, the macromolecular polysaccharide component is concentrated by 1-8 times through a reverse osmosis membrane, and then is evaporated and concentrated through an evaporator.

Further, when the macromolecular polysaccharide is refined, the macromolecular polysaccharide is sequentially subjected to activated carbon decolorization and ion exchange treatment.

Further, when the alcohol lees filtrate is subjected to membrane filtration, the alcohol lees filtrate is filtered through a ceramic membrane.

Furthermore, the filtering aperture of the ceramic membrane is 2-100 nanometers.

Further, when the membrane separation is carried out on the clear liquid, a roll-type ultrafiltration membrane is adopted to carry out the separation on the clear liquid.

Furthermore, the cut-off molecular weight of the roll-type ultrafiltration membrane is 2000-50000 or 5000-10000.

Further, when the small molecule mixture is concentrated, the small molecule mixture is firstly subjected to reverse osmosis concentration, and then is concentrated by an evaporator to obtain the high-concentration mixture.

Further, when the small molecule mixture is subjected to reverse osmosis concentration, the small molecule mixture is concentrated by 1-8 times.

Compared with the prior art, the method has the advantages that the concentration treatment of the alcohol lees filtrate is carried out in a membrane concentration mode, the membrane concentration only consumes electric energy, the energy consumption can be effectively reduced, and the operation cost is saved. Meanwhile, the steam basically adopts a coal-fired boiler, so that the environment is polluted, the membrane concentration only needs electric energy, and the COD (chemical oxygen demand) of the water obtained by concentration is lower than that of the water obtained by evaporation, so that the environmental pollution is reduced while the sewage treatment difficulty is effectively reduced, and the environment is effectively protected.

Furthermore, in the invention, the soluble saccharide in the vinasse filtrate is extracted, so that the Maillard reaction of the saccharide and the amino acid is avoided or reduced, the loss of the amino acid is reduced, the problem of dark color of the DDGS feed during drying is solved, and the quality of the DDGS feed is greatly improved.

Further, in the invention, after soluble polysaccharide in the DDGS feed is extracted, the anti-nutritional factors of the feed are reduced, and the reduction of the absorption capacity of the animal on nutrient components after the animal intakes the polysaccharide which can not be digested is avoided.

Further, in the invention, the soluble polysaccharide extracted from the DDGS feed is high-quality soluble dietary fiber, can absorb water and swell in the stomach of a human body to bring a feeling of satiety, avoid excessive eating, and help to clean fat and cholesterol in the intestinal tract to reduce the absorption of the human body to rich nutrients, and the soluble polysaccharide in the DDGS feed is beneficial to human beings but not animals, and can be effectively utilized after being extracted to improve the utilization value.

Further, in the invention, the soluble polysaccharide extracted from the DDGS feed is prepared into the soluble polysaccharide product, so that the extract in the DDGS feed preparation process can be fully utilized, the product value is greatly improved, and the production cost can be effectively reduced.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

FIG. 1 is a flow chart of a conventional protein feed preparation process provided in an embodiment of the present invention;

FIG. 2 is a flow chart of a method for corn distillers grains filtrate concentration and extraction of sugar and protein according to an embodiment of the present invention;

FIG. 3 is a flow chart of preparing protein feed from low concentration filtrate according to the embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1, in the prior art, when preparing the DDGS feed, corn is generally fermented and then distilled to obtain alcohol and distiller's grains, and the obtained distiller's grains are used for preparing the DDGS feed. And carrying out solid-liquid separation on the obtained vinasse to obtain filter residue and low-concentration filtrate. Evaporating the low-concentration filtrate to obtain high-concentration filtrate and water. And mixing distiller's grains into the high-concentration filtrate obtained after evaporation, and drying to obtain protein feed (DDGS feed). The problem that the production cost is high, and soluble polysaccharide generated in the DDGS feed preparation process cannot be fully utilized when the DDGS feed preparation is carried out in the prior art, so that the product value is low is solved.

The embodiment provides a method for concentrating corn alcohol vinasse filtrate and extracting sugar and protein, which is characterized in that low-concentration filtrate obtained in a DDGS feed preparation process is treated, so that the cost of treating the low-concentration filtrate is saved, the generation of pollutants in the protein feed is reduced, the sugar component in the alcohol vinasse filtrate can be extracted, the problem of blackened color in the DDGS drying process after syrup and vinasse are mixed is effectively solved, and the quality of DDGS is improved.

Meanwhile, the method can extract soluble polysaccharide from the DDGS feed, the soluble polysaccharide is high-quality soluble dietary fiber, the soluble polysaccharide can absorb water and swell in the stomach of a human body to bring satiety, excessive diet is avoided, meanwhile, the method can help to clean fat and cholesterol in the intestinal tract and reduce the absorption of the human body to rich nutrients, the soluble polysaccharide in the DDGS feed is beneficial to human beings but not beneficial to animals, and the soluble polysaccharide can be effectively utilized after being extracted, so that the utilization value is improved.

Specifically, the embodiment can also extract the saccharide components in the corn distillers' grains filtrate, thereby not only improving the product value, but also avoiding the influence of the saccharide substances in the DDGS feed on the intake of the feed by the animals, improving the absorption of fat and nutrition by the animals, and effectively improving the nutritional characteristics of the DDGS feed after the syrup is extracted. In addition, the soluble polysaccharide extracted from the DDGS feed is prepared into a soluble polysaccharide product, so that the extract in the DDGS feed preparation process can be fully utilized, the product value is greatly improved, and the production cost can be effectively reduced.

Referring to fig. 2, the present embodiment provides a method for concentrating corn distillers' grains filtrate and extracting sugar and protein, comprising the following steps:

step 1: filtering the alcohol residue filtrate by using a membrane to obtain clear liquid and membrane concentrate;

step 2: performing membrane separation on the clear liquid to obtain a macromolecular polysaccharide component and a micromolecular mixture;

and step 3: treating the macromolecular polysaccharide component to obtain a soluble polysaccharide product;

and 4, step 4: concentrating the small molecule mixture to obtain a high-concentration mixture;

and 5: and mixing the membrane concentrate and the high-concentration mixture with vinasse and drying to obtain the protein feed.

Specifically, the distillers 'grains filtrate in this embodiment is a low concentration filtrate obtained by solid-liquid separation of distillers' grains during the preparation of the DDGS feed.

Specifically, in the present embodiment, when the corn distillers 'grains filtrate is concentrated, the membrane concentration is adopted to perform the concentration of the distillers' grains filtrate, and compared with the conventional evaporation treatment, the membrane concentration treatment method in the present embodiment requires a large amount of steam resources to be consumed in the conventional evaporation mode, and the membrane concentration in the present embodiment only consumes electric energy, which can effectively reduce energy consumption and save operation cost. For example, while a traditional process requires 0.25 ton of steam for evaporating one ton of water, which requires a cost of 50 yuan per ton of steam, a process using membrane concentration for filtering one ton of water requires only about 10 yuan, which saves 80% of the operating cost.

Particularly, steam in the traditional evaporation mode is basically produced by adopting a coal-fired boiler, the production process of the steam has great pollution to the environment, the membrane concentration mode of the embodiment only needs to consume electric energy, and the COD (chemical oxygen demand) of the water obtained by concentration is lower than that of the water obtained by evaporation, so that the environmental pollution is reduced while the treatment difficulty of sewage is effectively reduced, and the environment is effectively protected.

Specifically, the lees filtrate is obtained by filtering lees, that is, the lees filtrate is obtained by solid-liquid separation of lees. It is understood that the solid-liquid separation of the whole stillage is carried out by filtration.

Specifically, the embodiment solves the problem of color darkening when the DDGS feed is dried by extracting the saccharides from the vinasse filtrate, and can effectively avoid the influence on the product quality caused by the blackening of the DDGS protein feed due to the Maillard reaction generated at high temperature when the saccharides in the clear liquid and the vinasse are mixed and dried, namely, the method can effectively avoid the blackening of the DDGS protein feed, and greatly improve the quality of the DDGS protein feed.

Specifically, the syrup extracted in the embodiment is soluble dietary fiber, so that after being taken by animals, satiety is enhanced, calorie intake is reduced, fat absorption is reduced, the absorption of the nutrition by the animals is influenced, and after being extracted, the nutritional characteristics of the DDGS feed can be effectively improved.

Specifically, as shown in fig. 3, in step 1, when the alcohol residue filtrate is subjected to membrane filtration to obtain a clear solution and a membrane concentrate, the alcohol residue filtrate is treated by filtration with a filtration membrane to obtain a filtered clear solution and a membrane concentrate.

Specifically, when the alcohol residue filtrate is subjected to membrane filtration, a microfiltration membrane is preferably selected as the filtration membrane for filtration, and the filtration precision of the microfiltration membrane is 2-100 nm.

Specifically, microfiltration membranes with corresponding pore diameters can be selected according to actual conditions, and after the microfiltration membranes are used for carrying out membrane filtration on the alcohol tank filtrate, the microfiltration membranes can intercept grease and insoluble substances in the alcohol tank filtrate, so that clear liquid and membrane concentrate are obtained. The film concentrate contains fats and oils, insoluble matter and soluble matter. The clear liquid is the above clear liquid.

Specifically, the microfiltration membrane is preferably a ceramic membrane, and the pore diameter of the ceramic membrane is preferably 2 to 100 nm.

Specifically, the clarified liquid filtered by the ceramic membrane contains soluble substances such as amino acids, saccharides, and proteins at a concentration of about 1 to 4%.

Specifically, in the step 2, when the macromolecular polysaccharide component is treated, the macromolecular polysaccharide component is concentrated, refined, evaporated and dried to obtain the soluble polysaccharide product.

Specifically, when the macromolecular polysaccharide component is concentrated, the macromolecular polysaccharide component is concentrated by 1-8 times through a reverse osmosis membrane, and then is evaporated and concentrated through an evaporator.

Specifically, when the macromolecular polysaccharide is refined, the macromolecular polysaccharide is sequentially subjected to activated carbon decoloration and ion exchange treatment to obtain a soluble polysaccharide product.

Specifically, when the membrane separation is performed on the clear liquid, the clear liquid is separated by using a roll-type ultrafiltration membrane.

Specifically, the cut-off molecular weight of the roll-type ultrafiltration membrane is 2000-50000 or 5000-10000.

Specifically, in the step 3, when the small molecule mixture is concentrated, the small molecule mixture is first concentrated by reverse osmosis, and then concentrated by an evaporator to obtain a high concentration mixture.

Specifically, when the reverse osmosis concentration is performed on the small molecule mixture, the small molecule mixture is concentrated by 1-8 times.

Specifically, in the step 5, after the medium-and-large-molecular polysaccharide component in the clear liquid is extracted, the small-molecular mixture separated from the clear liquid is concentrated to obtain a high-concentration mixture, the membrane concentrate and the high-concentration mixture are simultaneously mixed with the vinasse, and the mixed substances are dried to obtain the protein feed.

In the embodiment, the soluble saccharides in the vinasse filtrate are extracted, so that the Maillard reaction of the saccharides and the amino acid is avoided or reduced, the loss of the amino acid is reduced, the problem of color deepening of the DDGS feed during drying is solved, and the quality of the DDGS feed is greatly improved. By extracting the soluble polysaccharide from the DDGS feed, the anti-nutritional factors of the feed are reduced, and the reduction of the absorption capacity of the animal on the nutritional ingredients after the animal intakes the polysaccharide which can not be digested is avoided.

In the embodiment, the soluble polysaccharide extracted from the DDGS feed is high-quality soluble dietary fiber, can absorb water and swell in the stomach of a human body to bring a feeling of satiety, avoids excessive eating, can help to clean fat and cholesterol in the intestinal tract and reduce the absorption of the human body to rich nutrients, is beneficial to human beings but is not beneficial to animals, and can be effectively utilized after being extracted, so that the utilization value is improved.

In the embodiment, the soluble polysaccharide extracted from the DDGS feed is prepared into the soluble polysaccharide product, so that the extract in the DDGS feed preparation process can be fully utilized, the product value is greatly improved, and the production cost can be effectively reduced.

It can be understood that, in the method for drying and extracting soluble polysaccharide from corn distillers 'grains, the clear liquid and the concentrated mixture are obtained by performing membrane filtration on a distillers' grains filtrate; separating the clear liquid by an ultrafiltration membrane to obtain a macromolecular polysaccharide component and other micromolecular mixtures; and mixing the small molecular mixture and the concentrated mixture with vinasse to obtain the protein feed. The soluble polysaccharide component extracted in the embodiment is soluble dietary fiber, has quite important physiological action, is supplemented and regarded as a seventh nutrient by the nutritional community, is parallel to the traditional six nutrients of protein, fat, carbohydrate, vitamin, mineral substances and water, can enhance satiety, reduce caloric intake and fat absorption after being ingested by animals, can influence the absorption of the nutrition by the animals, and can effectively improve the nutritional characteristics of the DDGS feed after being extracted by syrup. By extracting the saccharides in the vinasse filtrate, the problem of deepening of the DDGS feed during drying is solved, and the quality of the DDGS protein feed is improved. Meanwhile, the drying cost can be reduced through the membrane concentration process.

In another preferred embodiment based on the above examples, in this embodiment, after the alcohol residue filtrate is filtered to obtain a clear solution and a membrane concentrate, the membrane concentrate is separated to obtain an oil phase, an aqueous phase and a solid phase, and the clear solution and the membrane concentrate are obtained again after the aqueous phase is subjected to membrane filtration.

Specifically, in an embodiment, the membrane concentrate is obtained and then separated to obtain an aqueous phase, an oil phase, and a solid phase.

Specifically, after the membrane concentrate is separated to obtain an aqueous phase, the aqueous phase is subjected to membrane filtration to obtain a clear liquid and a membrane concentrate again, the steps 2 to 5 in the above examples are repeated, and the clear liquid and the membrane concentrate obtained again are subjected to treatment, that is, after the aqueous phase is obtained, the steps 2 to 5 are repeatedly performed to treat the clear liquid and the membrane concentrate obtained from the aqueous phase again.

Specifically, when the alcohol lees filtrate and the water phase are subjected to membrane filtration, a microfiltration membrane is selected for filtration, and the filtration precision of the microfiltration membrane is 2-100 nanometers.

Specifically, in the above examples, after the membrane concentrate is separated to obtain the aqueous phase, the aqueous phase is again subjected to membrane filtration to obtain the clear liquid and the membrane concentrate from the membrane-filtered aqueous phase, and the clear liquid and the membrane concentrate are again treated according to the above treatment method, so that the oil phase and the solid phase of the membrane concentrate can be efficiently extracted to sufficiently extract the utilizable substances.

Specifically, the membrane concentrate is separated to obtain an oil phase and a solid phase, and the oil phase and the solid phase are mixed with the high-concentration mixture and are dried with vinasse to obtain the protein feed.

Specifically, in the above examples, when the membrane concentrate is separated, the membrane concentrate is separated by a centrifuge. The centrifuge is preferably a disk centrifuge which can divide the mixed material into three parts: an oil phase, an aqueous phase and a solid phase.

Specifically, the membrane concentrate contains a large amount of soluble substances, the efficiency of microfiltration membrane filtration is low due to the influence of fats and oils and solid impurities, the membrane concentrate is separated by a centrifuge to remove solid impurities and fats and oils to obtain an aqueous solution (i.e., the aqueous phase), and the aqueous solution is treated again.

Specifically, when the clear liquid is subjected to ultrafiltration membrane separation, the clear liquid is subjected to reverse osmosis dehydration to obtain a concentrated solution, and the concentrated solution is subjected to ultrafiltration membrane separation to obtain a macromolecular polysaccharide component and a micromolecular mixture.

Specifically, the polysaccharide fraction obtained in this example was concentrated, refined, evaporated, and dried to obtain a polysaccharide product.

Specifically, in the present embodiment, when the small molecule mixture is subjected to reverse osmosis dehydration, the small molecule mixture is subjected to reverse osmosis dehydration by a reverse osmosis membrane to obtain a concentrated solution.

Specifically, in the above examples, after the clear liquid was dehydrated by reverse osmosis, the clear liquid was further concentrated after being subjected to osmotic filtration by a reverse osmosis membrane, and the resulting concentrated solution was obtained.

Specifically, the reverse osmosis membrane can retain most of the components in the clear liquid and allow only water to permeate therethrough, thereby obtaining a concentrated solution after concentration, which is the high-concentration mixture.

Specifically, the membrane concentrate of the above example was separated to obtain an oil phase and a solid phase, which were separated and extracted to achieve the effect of concentration.

It can be understood that, in the above embodiment, the concentration treatment of the alcohol residue filtrate is performed in a membrane concentration manner, and the membrane concentration only consumes electric energy, so that the energy consumption can be effectively reduced, and the operation cost can be saved. Meanwhile, the steam basically adopts a coal-fired boiler, so that the environment is polluted, the membrane concentration only needs electric energy, and the COD (chemical oxygen demand) of the water obtained by concentration is lower than that of the water obtained by evaporation, so that the environmental pollution is reduced while the sewage treatment difficulty is effectively reduced, and the environment is effectively protected.

In the embodiment, the problem of color deepening of the DDGS feed during drying is solved by extracting the saccharides in the vinasse filtrate, and the problem that the DDGS protein feed is blackened due to Maillard reaction generated at high temperature when the saccharides in the clear liquid and the vinasse are mixed and dried can be effectively avoided, so that the quality of the product is influenced.

The polysaccharide component extracted in the embodiment is soluble dietary fiber, after being ingested by animals, satiety can be enhanced, caloric intake can be reduced, absorption of fat can be reduced, absorption of nutrition by the animals can be influenced, and after the polysaccharide component is extracted, the nutritional characteristics of the DDGS feed can be effectively improved.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.

Claims

1. A method for drying corn distillers' grains and extracting soluble polysaccharide is characterized by comprising the following steps:

2. The method of claim 1, wherein the soluble polysaccharide is obtained by concentrating, refining, evaporating and drying the macromolecular polysaccharide fraction during the treatment of the macromolecular polysaccharide fraction.

3. The method for drying and extracting soluble polysaccharides from corn distillers grains according to claim 2, wherein the concentration of the macromolecular polysaccharides is performed by concentrating the macromolecular polysaccharides 1-8 times through a reverse osmosis membrane, and then evaporating and concentrating the macromolecular polysaccharides through an evaporator.

4. The method of claim 3, wherein the macromolecular polysaccharide is purified by sequentially decolorizing with activated carbon and ion-exchanging the macromolecular polysaccharide.

5. The method of claim 1, wherein the membrane filtration is performed on the spent grain filtrate, and the spent grain filtrate is filtered through a ceramic membrane.

6. The method of claim 5, wherein the ceramic membrane has a filtration pore size of 2-100 nm.

7. The method for drying the corn distillers grains and extracting the soluble polysaccharides as claimed in claim 1, wherein the membrane separation of the clear solution is performed by using a roll-type ultrafiltration membrane.

8. The method for drying and extracting soluble polysaccharide from corn distillers' grains as claimed in claim 7, wherein the molecular weight cut-off of the spiral-wound ultrafiltration membrane is 2000-50000 or 5000-10000.

9. The method of claim 1, wherein the small molecule mixture is concentrated by reverse osmosis and then concentrated by an evaporator to obtain the high concentration mixture.

10. The method of claim 9, wherein the small molecule mixture is concentrated 1-8 times during the reverse osmosis concentration of the small molecule mixture.