JPS5919000B2 - Method for purifying sugar solution containing fructose - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a method for purifying a fructose-containing sugar solution, and more specifically, a fructose-containing sugar solution is prepared by mixing a strongly basic anion exchange resin and a weakly basic anion exchange resin. The present invention relates to a method for purifying a sugar solution containing fructose that is treated with an anion exchange resin.

Currently, the composition ratio of sugar is the highest among fructose-containing sugar solutions.
Sugar solutions as shown in the table are generally known.

These liquid sugar and sugar solution (hereinafter simply referred to as sugar solution) contain fructose, which has a higher degree of sweetness at low temperatures than sucrose.
Since it is low in calories, it has recently attracted attention as a sweetener for Western confectionery, ice cream, etc.

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In the various sugar solution manufacturing processes mentioned above, impurities originating from the production method, such as high-fructose corn syrup, isomerized sugar solution, etc., contain impurities such as polymer colloids, protein colorants, and salts. A method is adopted in which a sugar solution containing impurities such as coloring matter and salt is obtained, such as invert sugar solution, and then the sugar solution is purified to produce various desired sugar solutions.

For example, a method for purifying isomerized sugar solution is to pass the solution through a strong acidic cation exchange resin, a weakly basic anion exchange resin, and then a strong acidic cation exchange resin and a strong basic anion exchange resin. A method of obtaining a purified isomerized sugar solution by passing the solution through a mixed bed is used.

Bifructose sugar solution is obtained by further concentrating the above-mentioned purified isomerized sugar solution to 70-90% of the fructose content using a special ion exchange resin for separating fructose and glucose. It will be done.

The bifructose sugar solution obtained in this way contains impurities such as small amounts of colored substances and salts brought in from the separation ion exchange resin, as well as colored substances generated during the separation process. The usual purification method is to pass the solution through a mixed bed of a strongly acidic cation exchange resin and a strongly basic anion exchange resin.

However, in the various sugar solution purification methods described above, when the sugar solution is treated with a strongly basic anion exchange resin, a portion of fructose isomerized into glucose and other sugars, resulting in a decrease in the amount of fructose recovered. was there.

The isomerase used to isomerize glucose into fructose is expensive, so it is extremely inconvenient from an economic standpoint that the produced fructose is isomerized to glucose during the purification process, reducing the amount of fructose recovered. there were.

Therefore, the present inventors conducted various studies in order to develop a method for suppressing the rate of decrease in recovered fructose without reducing the amount of processed sugar solution containing fructose, and as a result, the present invention was completed.

That is, the gist of the present invention is to treat a fructose-containing sugar solution with an anion exchange resin that is a mixture of a strongly basic anion exchange resin and a weakly basic anion exchange resin. The main idea is a method for purifying liquids.

The ratio of the weakly basic anion exchange resin to the total exchange capacity of the strongly basic anion exchange resin and the weakly basic anion exchange resin can be in the range of 70 to 30%, preferably 60 to 40%. .

By using it within this range, the increase in pH of the sugar solution near the particle surface of the anion exchange resin can be suppressed to a low level, so that the isomerization of fructose to glucose can be suppressed to an extremely low level.

In the present invention, both gel type and porous type resins can be used as the ion exchange resin.

Furthermore, the method for regenerating the anion exchange resin of the present invention whose ion exchange ability has been reduced by the present invention is a method of directly regenerating with an alkali, and a method of regenerating the conventional anion exchange resin such as a method of regenerating with an alkali after pre-Ming with an acid or salt. The entire method can be carried out in the same way, and there is no need to separate and regenerate the strongly basic anion exchange resin and the weakly basic anion exchange resin.

Further, even when used in a mixed bed with a cation exchange resin, there is no need to separate the strong and weak basic anion exchange resins of the present invention from each other.

Next, the present invention will be explained with reference to examples, but the present invention is not limited to the following examples.

Example The total sugar concentration was 37.0%, consisting of 94.1% fructose and 4.3% glucose, and the specific resistance value was 5. l
A porous anion exchange resin 20TLl is prepared by mixing a sugar solution with a The solution was passed through a mixed bed of 10 ml of gel-type strongly acidic cation exchange resin having sulfonic acid groups, and the amount of treated solution and the amount of purified fructose sugar solution at that time were measured.

The above sulfonic acid type strongly acidic cation exchange resin is Diaion [F]S K manufactured and sold by Mitsubishi Chemical Industries, Ltd.
1. B was used.

The porous anion exchange resin shown in Table 2 was a mixture of a strongly basic anion exchange resin Diaion 18PA408 and a weakly basic anion exchange resin WA30, also manufactured and sold by Mitsubishi Chemical Industries, Ltd.

The strongly acidic cation exchange resin used in the test was regenerated with 8% hydrochloric acid (hydrochloric acid 100?/1i-R), and the anion exchange resin was regenerated with 4% caustic soda (caustic soda 100?/1i-R) in a mixed state.
−R) are transferred to φ14 at a predetermined ratio.
A jacketed glass column of X500%H was packed and these resins were uniformly mixed to form a mixed bed.

The liquid was passed through the bifructose sugar solution at a constant temperature of 40'C at a rate of 90ml/Hr, S V 3 Hr'
The treated sugar solution obtained is 90 to 180 ml.
Each fraction was sampled, and the component ratio of fructose and glucose was analyzed using high performance liquid chromatography, and the specific resistance was also measured.

At the end point of the treated sugar solution, the specific resistance value is 50 x 104 Ωcm (25
℃).

The results are shown in Table 3, Figures 1 and 2.

In FIG. 1, the vertical axis represents the recovery rate (%) of fructose, and the horizontal axis represents the ratio (%) of the exchange capacity of the weakly basic anion exchange resin to the total exchange capacity of the anion exchange resin.

In Figure 2, the vertical axis is the amount of bifructose sugar solution processed per unit amount of resin (l/l-Re5in
), and the horizontal axis indicates the ratio (%) of the exchange capacity of the weakly basic anion exchange resin to the total exchange capacity of the anion exchange resin, as in FIG.

These results show that as the exchange capacity of the weakly basic anion exchange resin decreases, the amount of treated liquid decreases, and conversely, the effect of inhibiting isomerization of fructose to glucose increases.

Therefore, the exchange capacity ratio of the weakly basic anion exchange resin to the total exchange capacity of the anion exchange resin is 60 to 40%.
Within this range, isomerization of fructose to glucose can be prevented without reducing the amount of processed sugar solution as much as possible.

[Brief explanation of the drawing]

In Figure 1, the vertical axis shows the recovery rate of fructose, the horizontal axis shows the ratio (%) of the exchange capacity of the weakly basic anion exchange resin to the total exchange capacity of the anion exchange resin, and in Figure 2, The vertical axis shows the processing amount of Hataifructose sugar solution per unit resin (l/l-Re5in), and the horizontal axis shows the ratio of the exchange capacity of the weakly basic anion exchange resin to the total exchange capacity of the anion exchange resin. (%) is shown.

Claims (1)

[Claims] 1. A fructose-containing sugar solution characterized by treating a fructose-containing sugar solution with an anion exchange resin that is a mixture of a strongly basic anion exchange resin and a weakly basic anion exchange resin. Method for purifying sugar solution. 2. In the method for purifying a sugar solution containing fructose according to claim 1, the exchange capacity ratio of the strongly basic anion exchange resin and the weakly basic anion exchange resin is 60:40.
A purification method characterized in that the ratio is 40:60.