JPS63177800A - Method for purifying sugar solution - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] C. Industrial Application Field] The present invention relates to a method for purifying a sugar solution that efficiently removes impurities such as "olid-like components" and "filtration-inhibiting components" from the sugar solution. be.

[Summary of the invention]

The present invention causes impurities such as oliy-like components, filtration-inhibiting precursor components, and filtration-inhibiting components in the sugar solution to be adsorbed to the cristobalite by causing a contact reaction between cristobalite and sugar solution. The aim is to improve the processing characteristics of sugar solution and molasses, which had been thought to be impossible, to facilitate cleaning operations and to increase the added value of molasses products.

[Conventional technology]

Sugar solutions that contain sweet ingredients derived from plant ingredients, such as cane sugar, beet sugar, and glucose, are characterized by containing various plant- or soil-derived ingredients as impurities, which makes it difficult to develop refined sugar technology. The basis of this field is technology that efficiently separates organic and inorganic components other than sugar.

These techniques are lime cleaning method, carbonate filling method, phosphoric acid cleaning method, sulfite cleaning method, bone charcoal method, and activated carbon method.

These methods include the ion exchange resin method, and each method seems to have been almost completed as a unit operation.

By the way, in the above-mentioned cleaning method, various types of filters are employed as unit operations that complement each cleaning process, and therefore, the filterability of the sugar solution is an important factor that determines the process capacity.

From this point of view, research has been conducted for a long time on the filtration-inhibiting components contained in sugar solutions, and methods for separating the filtration-inhibiting components have been studied, but an efficient method for separating them has yet to be found. The current situation is that this has not been done.

Alternatively, when refining molasses, for example, it is important to efficiently remove not only filtration-inhibiting substances but also sludge-like components in molasses, thereby increasing the added value of molasses products. .

However, the method for removing the sludge components in molasses is to dilute the molasses to a Bx of 50 (Brix 50) or less, boil it, and leave it for a long time to remove the sludge-like precipitated material and the upper layer of sugar. A common method is to separate the liquid from the
It has been almost impossible to remove sludge-like components from molasses containing a large amount of sludge-like components by a filtration method (for example, using a filter cloth filter plate).

As a method for separating olivine components by filtration, slightly special filtration operations 1 such as ultra-precise filtration, self-exclusion membrane method,
Separation and removal was possible only by ultrafiltration membrane methods, etc., but in any case these methods have poor filtration efficiency and are problematic in terms of cost. Another method for purifying molasses is the phosphoric acid purification method, which is the same as for sugar solution.

Carbonation saturation methods and the like are also being considered, but both methods have difficulties in separating the sludge material and clear liquid, and there are many problems in implementing them on an industrial scale.

[Problem that the invention seeks to solve]

As mentioned above, the efficient removal of filtration-inhibiting components and sludge-like components is a major issue in order to facilitate the cleaning operation of sugar solution and increase the added value of molasses.

The present invention was proposed in view of the above-mentioned actual situation in the technical field, and an object of the present invention is to provide a method for purifying a sugar solution that can efficiently remove filtration-inhibiting components and sludge-like components. The purpose of this invention is to improve the processing characteristics of sugar solutions and molasses, which were considered impossible to filter using conventional techniques.

[Means for solving problems]

The present inventors have conducted basic research on adsorption phenomena of various natural minerals in order to solve such technical problems, and as a result, for example, the adsorption of silica compounds and powdered strong basic anion exchange resins When comparing the effects, it was found that the cristobalized silicate compound was superior.

Furthermore, through the results of a series of basic experiments, we found that cristobalized silicic acid compounds mutually adsorb and react with oliy-like substances in molasses. When the liquid is applied as a liquid to be treated in the powder strong base anion exchange resin cleaning method, the contamination of the powder ion exchange resin is extremely reduced and the separation and filtration operation of the powder ion exchange resin is significantly improved. I came to this knowledge.

The present invention was completed based on this knowledge, and is characterized by bringing a sugar solution into contact with cristobalite and then separating the cristobalite that has adsorbed impurities.

Cristobalite is a mineral with the same composition (SiO□) as quartz. Unlike quartz, it is stable from 1470°C to a melting point of 1700°C due to the difference in molecular arrangement in the crystal.
It is metastable from 230°C to around 250°C. Naturally occurring crystals form regular octahedral crystals, which are low-temperature (tetrahedral) and high-temperature (tetrahedral) crystals at 180°C to 270°C.
Equiaxed products). It occurs as fine crystals in the crevices of andesite, but it can also be found in the base of rocks. Cristobal stone that is naturally produced in Japan includes one produced in Aomori Prefecture (for example, manufactured by Nippon Steel Mining Co., Ltd.).

Methods for cleaning the sugar solution using the above-mentioned cristobalite include a method of passing the sugar solution through a filter made of granular cristobalite, a method of causing a contact reaction between powdered cristobalite and the sugar solution, or a combination of these methods. Examples include methods.

In this case, for example, the operating conditions for removing the oliy-like substance in the sugar solution are to heat the sugar solution to be treated to 90°C or higher to generate an oliy-like substance, and then to cause a contact reaction with cristobalite. Although the adsorption removal effect is large, it was also found that a considerable amount of sludge components can be removed even without heat treatment.

However, the processed I! It is desirable to heat the i-liquid to 90°C or higher, as this has a sterilizing effect.

A dilute sugar solution such as cane sugar juice or beet sugar liquid (Bx, 2
0 or less), either add powdered cristobalite directly to the sugar juice or use the lime cleaning method (defication).
At the same time, an addition contact reaction may be carried out, and in either case, filtration-inhibiting components can be effectively removed. The reactivity of cristobalite with filtration-inhibiting substances and ore-like substances increases as the particle size of cristobalite becomes finer, but fine particles are difficult to separate from the sugar solution. However, in the case of a dilute sugar solution, powdered cristobalite (specific gravity 2) adsorbs and precipitates oliy-like substances and filtration-inhibiting substances in the sugar solution, so it can not only be applied at the same time as the definition operation, but also In fact, it makes it possible to carry out the definition operation more effectively.In addition, diatomaceous earth is used as a filter aid in the various filter plates used in each process of the refined sugar system to increase the filtration rate. However, the method of substituting this diatomaceous earth with powdered Cristobalite is as follows.
It is an excellent method for removing filtration-inhibiting precursors and filtration-inhibiting substances.

The most effective way to apply Cristobalite to a sugar solution is to
A filter is constructed using granular Cristobalite, and molasses containing a large amount of filtration-inhibiting substances is passed through the filter. With this method, it is possible to remove "olith-like components" and "filtration-inhibiting substances" from high-density molasses, which cannot be purified using conventional techniques, and the added value of molasses can be dramatically improved. The economic effects of this are enormous.

The cristobalite that has adsorbed impurities through the above-mentioned operation needs to be separated from the sugar solution by a fractionation operation, but this fractionation operation may be performed by filtration or sedimentation.

It is possible to easily separate them using either method. When configured as a filtration system, the sugar solution and Cristobalite can be separated without any special separation operation.

Furthermore, as described above, the cristobalite used for cleaning the sugar solution and molasses can be regenerated by a cleaning operation or the like. For example, a filter made of granular cristobalite can easily be returned to its original state by backwashing with warm water or a dilute acid solution, and will once again exhibit its adsorption effect. Therefore, it can be used repeatedly, which is very advantageous when considering use on an industrial scale.

[Effect]

Granular cristobalite and powdered cristobalite exhibit extremely excellent adsorption properties among natural minerals, and mutually adsorb impurities such as sludge components, filtration-inhibiting precursors, and filtration-inhibiting substances in sugar solution. react and remove them efficiently.

Furthermore, cristobalite that has adsorbed impurities is easy to separate, and is quickly separated from the sugar solution by filtration, sedimentation, or the like.

〔Example〕

Hereinafter, the present invention will be explained using specific examples, but it goes without saying that the present invention is not limited to these examples.

Next time Y First, the configuration of the filter and evacuation system used in this embodiment will be explained.

As shown in Fig. 1, the filter used in this example is a first filter filled with granular Cristobalite (particle size 2-5 mm)
The basic structure is a slow-moving seat (1) and a second slow-moving seat (2) filled with granular cristobalite having a smaller particle size (approximately 0.33 m11). In this example, the first filter seat (1) is filled with granular Cristobal stone, manufactured by Nippon Steel Mining Co., Ltd., trade name Crisbar G 700, and the second filter seat (2) is filled with the granular Cristobal stone. As the granular Cristobal stone to be used, the product name Cristobal G300 manufactured by Nippon Steel Mining Co., Ltd. was used.

Water jackets (3) and (4) are provided around each of the above-mentioned filter seats (1) and (2), and by passing hot water for heating, these filter seats (1) and ( 2
) can be heated to a predetermined temperature.

Then, the sugar solution to be treated is supplied to the first filtration pressure (1) via the pump (5), and after being treated to some extent, it is further passed through the second filtration pressure (2). filtration pressure (2
) is configured to be taken out as a treated sugar solution from the bottom of the container.

Using the filtration pressure configured above, the following experiment was conducted.

Blackstrap molasses produced from a refined sugar factory was prepared to Bx, 58,
After adding sodium hydroxide to make r+ H6,4, 9
Heated to 0°C.

Next, the temperature of the sugar solution was lowered to 60°C, and the liquid was passed through the overpressure Cristobalite layer shown in FIG. 1 in a downward flow under the conditions of 60°C, S, and Vl.

By treating about 30 times the amount of molasses to Cristobalite, the filtration pressure (differential pressure) became 2 kg/ct or more, so the flow was stopped and the sugar was removed with hot water.

The Cristobal stone-treated sugar solution was mainly measured for its filtration performance and the amount of sludge produced. The analysis method is as follows.

Filtration performance: After preparing the test sugar solution to Bx 50, filter it into a constant pressure filtration tester (manufactured by Toyo Kagaku Co., Ltd., filtration area IQcJ).
No. 2) was loaded, pressure filtration was performed at 25° C. and 1 kg/cJ, and the time required to filter 200rd was determined.

Ori component amount: Prepare the test sugar solution to Bx 50, boil it for 1 minute, and then add 1! to a 100ml measuring cylinder. The liquid was transferred and left to stand in a constant temperature bath at 38°C for 15 hours. The ratio of the lower layer of the dregs-containing sugar solution at this time was expressed as a percentage as the amount of dregs generated.

In addition, Bx, pH, and apparent pure sugar rate dichromatic value were measured by conventional methods according to the Sugar Manufacturing Handbook (Asakura Shoten) method. The results are shown in Table 1.

Table 1 Tianyu Zunji.

Refined sugar factory method molasses (Bx, 60) was heated to 70°C under Cristobal stone filtration pressure [bottom area (15 Cnl) Without heating, 6000 mN of liquid was passed in an upward flow at a flow rate of 300 mf/hour. The treated sugar solution was analyzed in the same manner as in Example 1. The results are shown in Table 2.

Table 2 - Powdered cristobalite (particle size 10 to 100 μm) was placed in a Nusoche test filter (effective filtration area 10 cJ).
It was precoated to a thickness of m. And this, BX, 5
500mA at 70℃ with Okinawan raw sugar dissolved in 0! The liquid was passed through. The properties of the treated sugar solution were measured in the same manner as in Examples 1 and 2. The results are shown in Table 3.

Table 3 Low-quality sweet potato juice was collected at 500+++f)-ruby strength and adjusted to pH 7 by adding milk of lime.

On the other hand, powdered Cristobalite (manufactured by Nippon Steel Mining Co., Ltd., product name Cristobal PW-300) was added to the cane juice prepared in the same manner.
, particle size of 100 μm or less) was added to prepare sugar juice.

These two types of sugar juices were heated to just before boiling using an electric heater, and then allowed to stand to determine the difference in sedimentation between the clear liquid in the upper layer and the sludge.

As a result, the sedimentation rate of the sugar juice sludge portion to which cristobalite was added was high, and the liquid and sedimentation portion were clearly separated in just 20 minutes. On the other hand, in the case of the sugar juice subjected to the normal definition operation, the separation between the two was incomplete even after one hour had passed.

〔Effect of the invention〕

As is clear from the above description, in the present invention,
By causing a contact reaction between cristobalite and the sugar solution, impurities such as filtration-inhibiting precursor components and filtration-inhibiting components in the sugar solution are adsorbed onto the cristobalite, making it possible to efficiently separate these impurities. be. Therefore, it is possible to improve the processing characteristics of sugar liquor and molasses, which were considered impossible to filter using conventional techniques.

The method of the present invention is particularly effective as a pretreatment method for sugar solution purification methods using ion exchange resins, electrodialysis methods, ion chromatography methods, and sugar solution purification methods using various membrane separation methods. It is possible to simplify a series of cleaning operations, such as reducing the amount of water and significantly improving separation and filtration operations.

In addition, especially when applied to molasses, it is possible to efficiently remove not only filtration-inhibiting components but also sludge-like substances, and the added value of the molasses product can be significantly improved.

Furthermore, since it is possible to regenerate cristobalite that has adsorbed impurities, when considering implementation on an industrial scale,
It can be said that the value is great.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an example of the configuration of a filter and retractor used in an embodiment of the present invention.

Claims (1)

[Claims] A method for purifying a sugar solution, which comprises bringing the sugar solution into contact with Cristobalite, and then separating the Cristobalite that has adsorbed impurities.