Method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography

Abstract

The present invention relates to a method for producing liquid maltitol and liquid polyols using chromatographic maltitol raffinate, which includes the steps of hydrogenating a pre-treated chromatographic maltitol raffinate to obtain a hydrogenated liquid, then post-treating the hydrogenated liquid to remove impurities and obtain a post-treated liquid, and then membrane-separating the post-treated liquid to obtain a dilute liquid and a maltitol-rich concentrated liquid, respectively, and using the dilute liquid as liquid polyol as it is, and blending the maltitol-rich concentrated liquid with an existing maltitol blend liquid having a maltitol content of more than 50% to obtain liquid maltitol having a maltitol content of more than 50% and meeting national standards. The present invention reduces the reducing sugar content in the sugar liquid by hydrogenation prior to membrane separation, thereby reducing the risk of yellowing during the process and improving the quality of the final product. The present invention is easy to operate, has a short production cycle, and comprehensively utilizes by-products, and has excellent economic effects.

Description

[Technical field]

[0001] The present invention belongs to the technical field of recycling maltitol raffinate, and in particular to a method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography. [Background technology]

[0002] Maltol is made from high-quality starch, which is liquefied and saccharified with an enzyme preparation to obtain ultra-high maltose slurry (maltose content 85% or more), then hydrogenated to obtain maltol liquid, and crystalline maltol is obtained through processes such as decolorization, chromatography, and crystallization. Among them, the raffinate obtained after separating the maltitol liquid by chromatography contains maltitol (15% to 40%), sorbitol (25% to 40%), and oligosaccharide alcohol (35% to 45%) as main components, and is usually used as a liquid polyol product, so the added value of the product is low. If it is possible to separate a portion of the maltitol components to produce liquid maltitol, the added value of the raffinate can be increased.

[0003] Patent publication number CN104177229B discloses a method for producing solid oligosaccharide alcohol and solid sorbitol using chromatographic maltitol raffinate, which can add high value to chromatographic maltitol raffinate for use.However, this method uses chromatographic separation technology to obtain three different raffinates, among which the maltitol-rich component is returned to the system, and the oligosaccharide alcohol and sorbitol-rich raffinates are purified by crystallization, which makes the technology complicated and the operation difficult.

[0004] Patent No. CN111206056A discloses a method for producing sorbitol liquid and liquid polyols using maltitol raffinate obtained by chromatography, in which glucose saccharification enzyme and dry yeast are added to the maltitol raffinate for fermentation, and the fermented liquid is decolorized and filtered and separated by membrane to obtain sorbitol liquid and liquid polyols. This method reduces the content of reducing sugar and oligosaccharides and increases the content of sorbitol through fermentation with saccharification enzyme, but this method requires a long time for saccharification and fermentation, which has a negative effect on efficiency. Summary of the Invention [Problem to be solved by the invention]

[0005] The technical problem to be solved by the present invention is to provide a method for producing liquid maltitol and liquid polyols using chromatographic maltitol raffinate by hydrogenating the chromatographic maltitol raffinate to reduce the content of reducing sugars in the raffinate, and then obtaining liquid polyol and maltitol-rich concentrate respectively by membrane separation technology, and blending the separated maltitol-rich concentrate with an existing maltitol blended liquid to obtain liquid maltitol that meets national standards, thereby effectively utilizing the chromatographic maltitol raffinate, increasing its added value, and providing a method that is simple, practical, and low-cost. [Means for solving the problem]

[0006] The present invention is achieved as follows: A method for producing liquid maltitol and liquid polyols using chromatographic maltitol raffinate is provided, which includes hydrogenating a pre-treated chromatographic maltitol raffinate to obtain a hydrogenated liquid, then post-treating the hydrogenated liquid to remove impurities to obtain a post-treated liquid, and then membrane separating the post-treated liquid to obtain a dilute liquid and a maltitol-rich concentrated liquid, respectively, and using the dilute liquid as liquid polyol as it is, and blending the maltitol-rich concentrated liquid with an existing maltitol blend liquid having a maltitol content of more than 50% to obtain liquid maltitol having a maltitol content of more than 50% and meeting national standards.

[0007] The maltitol raffinate is pretreated by chromatography to obtain a pretreated liquid, which has a refractive index of 48-54%, a maltitol content of 15%-40%, a sorbitol content of 25%-40%, and an oligosaccharide alcohol content of 35%-45%.

[0008] Under normal circumstances, in the maltitol raffinate obtained by chromatography, the content of maltitol is 15%-40%, the content of sorbitol is 25%-40%, and the content of oligosaccharide alcohols is 35%-45%.

[0009] According to the national standard for liquid maltitol, the content of maltitol is not less than 50%, the content of sorbitol is not more than 8%, and the content of reducing sugar is not more than 0.3%.

[0010] In the liquid maltitol after the blending of the present invention, the content of maltitol is 50.2%-60%, the content of sorbitol is 1%-5.7%, and the content of reducing sugar is 0.1%-0.14%, which meets the national standard for liquid maltitol.

[0011] Further, the pretreatment for the maltitol raffinate by chromatography includes a membrane concentration treatment or an evaporation concentration treatment, a primary decolorization treatment, and an evaporation treatment.

[0012] Furthermore, the type of evaporator used in the evaporation process is any one of a triple effect evaporator, a quadruple effect evaporator, an MVR evaporator, and a plate type evaporator.

[0013] Further, post-treatment of the hydrogenated liquid includes secondary decolorization and ion exchange treatment.

[0014] Further, the conditions of the hydrogenation treatment are a hydrogenation reaction temperature of 130° C. to 145° C., a pH value of the hydrogenation reaction liquid material of 5.5 to 6.5, and a hydrogenation reaction pressure of 6 MPa to 8 MPa.

[0015] Furthermore, the method includes the steps of first pretreating the maltitol raffinate by chromatography to obtain a pretreated liquid with a refractive index of 49.5%, then hydrogenating the pretreated liquid, and post-treating the hydrogenated liquid to remove impurities. Furthermore, the post-treated liquid is subjected to membrane separation treatment by a membrane separation device to obtain a dilute liquid which is a liquid polyol and a maltitol-rich concentrated liquid, respectively, and blending the maltitol-rich concentrated liquid with an existing maltitol blended liquid having a maltitol content of more than 50% in a ratio of 1:0.75 to obtain liquid maltitol with a maltitol content of 50.2% and a sorbitol content of 4.6%, which meets the national standard.

[0016] Furthermore, the method includes the steps of first pretreating the maltitol raffinate by chromatography to obtain a pretreated liquid with a refractive index of 49.5%, then hydrogenating the pretreated liquid, and post-treating the hydrogenated liquid to remove impurities. Furthermore, the post-treated liquid is subjected to membrane separation treatment by a membrane separation device to obtain a dilute liquid which is a liquid polyol and a maltitol-rich concentrated liquid, respectively, and blending the maltitol-rich concentrated liquid with an existing maltitol blended liquid having a maltitol content of more than 50% in a ratio of 1:0.75 to obtain liquid maltitol with a maltitol content of 50.2% and a sorbitol content of 5.7%, which meets the national standard. Effect of the Invention

[0017] Compared with the prior art, the method for producing liquid maltitol and liquid polyols using maltitol raffinate obtained by chromatography of the present invention comprises hydrogenating the maltitol raffinate obtained by chromatography after pretreatment to obtain a hydrogenated liquid, then post-treating the hydrogenated liquid to remove impurities to obtain a post-treated liquid, and then membrane separating the post-treated liquid to obtain a dilute liquid and a maltitol-rich concentrated liquid, respectively, and using the dilute liquid as liquid polyol as it is, and blending the maltitol-rich concentrated liquid with a maltitol blended liquid having a maltitol content of more than 50% to obtain liquid maltitol having a maltitol content of 50% or more and meeting national standards. The present invention obtains the maltitol-rich concentrated liquid and the dilute liquid of liquid polyol by membrane separation technology, thereby increasing the blending ratio with the maltitol blended liquid, and improving the value of the maltitol raffinate obtained by chromatography. In addition, the present invention has the following features:

[0018] 1. Prior to membrane separation, the hydrogenation process is used to reduce the reducing sugar content in the sugar solution, reducing the risk of yellowing during the process and improving the quality of the final product.

[0019] 2. It is easy to operate, has a short production cycle, and comprehensively utilizes by-products, with excellent economical effects. [Brief description of the drawings]

[0020] [Figure 1] FIG. 1 is a schematic diagram showing the principle of the process for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0021] In order to clarify the technical problems, technical solutions and advantageous effects of the present invention, the present invention will be described in more detail with reference to the drawings and examples below. Note that the specific examples described herein are only for the purpose of interpreting the present invention and are not intended to limit the present invention.

[0022] Referring to FIG. 1, a preferred embodiment of the method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to the present invention is shown, and the direction of the arrows in the figure indicates the production flow of materials.

[0023] The method includes the steps of hydrogenating the pre-treated chromatographic maltitol raffinate to obtain a hydrogenated liquid, then post-treating the hydrogenated liquid to remove impurities to obtain a post-treated liquid, and then membrane-separating the post-treated liquid to obtain a dilute liquid and a maltitol-rich concentrated liquid, respectively, and using the dilute liquid as is as liquid polyol, and blending the maltitol-rich concentrated liquid with an existing maltitol blend liquid having a maltitol content of more than 50% to obtain liquid maltitol having a maltitol content of more than 50% that meets the national standard.

[0024] The maltitol raffinate is pretreated by chromatography to obtain a pretreated liquid, which has a refractive index of 48-54%, a maltitol content of 15%-40%, a sorbitol content of 25%-40%, and an oligosaccharide alcohol content of 35%-45%.

[0025] Specifically, the pretreatment of the maltitol raffinate by chromatography includes membrane concentration or evaporation, primary decolorization, and evaporation. The posttreatment of the hydrogenated liquid includes secondary decolorization and ion exchange. The type of evaporator used in the evaporation is any one of a triple-effect evaporator, a quadruple-effect evaporator, an MVR evaporator, and a plate evaporator.

[0026] Specifically, the hydrogenation treatment conditions are a hydrogenation reaction temperature of 130° C. to 145° C., a pH value of the hydrogenation reaction liquid material of 5.5 to 6.5, and a hydrogenation reaction pressure of 6 MPa to 8 MPa.

[0027] The contents of each sugar alcohol component in the obtained dilute and concentrated solutions are shown in Table 1 below.

[0028] [Table 1]

[0029] The dilute liquid has ingredients that meet the standards for liquid polyols, and the reducing sugar is lower than the control index of 0.3%, so it can be used as a liquid polyol product as it is. The concentrated liquid is rich in maltitol, and when mixed with a liquid maltitol blend with a maltitol content of more than 50%, it becomes liquid maltitol that meets the national standard. The liquid maltitol blend used has a maltitol content of 60%, a sorbitol content of 3%, and a reducing sugar content of 0.1%. According to the national standards for liquid maltitol, the maltitol content is ≧50%, the sorbitol content is ≦8%, and the reducing sugar content is ≦0.3%.

[0030] The process of the present invention is further illustrated by the following specific examples.

[0031] Example 1 A first embodiment of the method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to the present invention comprises the following steps:

[0032] First, the maltitol raffinate was pretreated by chromatography to obtain a pretreated liquid with a refractive index of 49.5%, and then the pretreated liquid was hydrogenated. The hydrogenation reaction temperature was 137°C, the pH value of the hydrogenation reaction liquid material was 5.9, and the hydrogenation reaction pressure was 7MPa. The measurement results showed that the hydrogenation conversion rate was 99.88%, and the content of reducing sugars in the liquid material after the hydrogenation reaction was 0.13%.

[0033] After hydrogenation, the hydrogenated liquid is sequentially subjected to decolorization and ion exchange post-treatment to remove impurities. The post-treatment liquid is then subjected to membrane separation treatment using a membrane separation device to obtain a dilute liquid, which is a liquid polyol, and a maltitol-rich concentrated liquid. The maltitol-rich concentrated liquid is blended with an existing maltitol blended liquid with a maltitol content of over 50% in a ratio of 1:0.75 to obtain liquid maltitol with a maltitol content of 50.2% and a sorbitol content of 5.6%, which meets the national standard.

[0034] The content of each sugar alcohol component in the obtained dilute solution, concentrated solution, and maltitol blend solution is shown in Table 2 below.

[0035] [Table 2]

[0036] Example 2 A second embodiment of the method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to the present invention comprises the following steps:

[0037] First, the maltitol raffinate was pretreated by chromatography to obtain a pretreated liquid with a refractive index of 49.5%, and then the pretreated liquid was hydrogenated. The hydrogenation reaction temperature was 136°C, the pH value of the hydrogenation reaction liquid material was 6.1, and the hydrogenation reaction pressure was 7.5MPa. The measurement results showed that the hydrogenation conversion rate was 99.85%, and the content of reducing sugars in the liquid material after the hydrogenation reaction was 0.14%.

[0038] After hydrogenation, the hydrogenated liquid is sequentially subjected to decolorization and ion exchange post-treatment to remove impurities. The post-treatment liquid is then subjected to membrane separation treatment using a membrane separation device to obtain a dilute liquid, which is a liquid polyol, and a maltitol-rich concentrated liquid. The maltitol-rich concentrated liquid is blended with an existing maltitol blended liquid with a maltitol content of over 50% in a ratio of 1:1.9 to obtain liquid maltitol with a maltitol content of 54.8% and a sorbitol content of 4.7%, which meets the national standard.

[0039] The contents of each sugar alcohol component in the obtained dilute solution, concentrated solution, and maltitol blend solution are shown in Table 3 below.

[0040] [Table 3]

[0041] The above is merely a preferred embodiment of the present invention, and is not intended to limit the present invention. All modifications, equivalent replacements, improvements, etc. made without departing from the spirit and principles of the present invention are intended to be included in the patent scope of the present invention.

Claims

1. A method for producing liquid maltitol and liquid polyols using a maltitol raffinate by chromatography, comprising the steps of: The method includes the steps of hydrogenating the pre-treated chromatographic maltitol raffinate to obtain a hydrogenated liquid, then post-treating the hydrogenated liquid to remove impurities to obtain a post-treated liquid, and then membrane-separating the post-treated liquid to obtain a dilute liquid and a maltitol-rich concentrated liquid, respectively, and using the dilute liquid as it is as a liquid polyol, and blending the maltitol-rich concentrated liquid with an existing maltitol blend liquid having a maltitol content of more than 50% to obtain a liquid maltitol having a maltitol content of 50% or more; The maltitol raffinate obtained by chromatography is pretreated to obtain a pretreated liquid, the pretreated liquid having a refractive index of 48-54%, a maltitol content of 15%-40%, a sorbitol content of 25%-40%, and an oligosaccharide alcohol content of 35%-45%; The chromatographic pretreatment of the maltitol raffinate includes a membrane concentration treatment or an evaporation concentration treatment, a primary decolorization treatment, and an evaporation treatment; A method for producing liquid maltitol and liquid polyols using a maltitol raffinate by chromatography, characterized in that the post-treatment of the hydrogenated liquid includes a secondary decolorization treatment and an ion exchange treatment.

2. The method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to claim 1, characterized in that the type of evaporator used in the evaporation process is any one of a triple effect evaporator, a quadruple effect evaporator, an MVR evaporator, and a plate type evaporator.

3. The method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to claim 1, characterized in that the conditions of the hydrogenation treatment are: hydrogenation reaction temperature: 130°C to 145°C; pH value of hydrogenation reaction liquid material: 5.5 to 6.5; and hydrogenation reaction pressure: 6 MPa to 8 MPa.

4. The method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to claim 1 includes the steps of: first, pretreating the maltitol raffinate by chromatography to obtain a pretreated liquid with a refractive index of 49.5%, then hydrogenating the pretreated liquid, and post-treating the hydrogenated liquid to remove impurities; and further performing membrane separation treatment on the post-treated liquid using a membrane separation device to obtain a dilute liquid which is a liquid polyol and a maltitol-rich concentrated liquid, respectively. The maltitol-rich concentrated liquid is blended with an existing maltitol blended liquid having a maltitol content of more than 50% in a ratio of 1:0.75 to obtain liquid maltitol having a maltitol content of 50.2% and a sorbitol content of 4.6%.

5. The method for producing liquid maltitol and liquid polyols using maltitol raffinate by chromatography according to claim 1 includes the steps of: first, pretreating the maltitol raffinate by chromatography to obtain a pretreated liquid with a refractive index of 49.5%, then hydrogenating the pretreated liquid, and post-treating the hydrogenated liquid to remove impurities; and further performing membrane separation treatment on the post-treated liquid using a membrane separation device to obtain a dilute liquid which is a liquid polyol and a maltitol-rich concentrated liquid, respectively. The maltitol-rich concentrated liquid is blended with an existing maltitol blended liquid having a maltitol content of more than 50% in a ratio of 1:0.75 to obtain liquid maltitol having a maltitol content of 50.2% and a sorbitol content of 5.7%.

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