JP4274505B2 - Sugar liquid purification method and apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method and an apparatus for purifying a sugar solution that can efficiently remove salts and greatly reduce the amount of chemicals used.
[0002]
[Prior art]
The refinement of the sugar solution is carried out to remove impurities over a wide range of electrolytes and non-electrolytes derived from the production method. Currently, there are (1) a method for removing impurities by crystallization, (2) a method for removing salts using chemicals, and (3) an ion exchange method using an ion exchange resin to remove salts in a sugar solution. The impurity removal method by crystallization of (1) requires a great deal of energy to evaporate water during crystallization. In addition, the method (2) for removing salts using a chemical has problems such as cost increase due to the installation of a chemical injection facility, chemical management, or chemical waste liquid treatment. Therefore, the ion exchange method using the ion exchange resin (3) is usually employed. This ion exchange method includes a treatment for purifying a sugar solution and a treatment for decolorizing the sugar solution.
[0003]
Conventionally, when a sugar solution is purified, the raw sugar factory has removed salts contained in the stock solution through a purification process such as carbonation and a crystallization process. At the beet sugar factory, refined sugar factory, and starch sugar factory, the salt contained in the stock solution was removed by combining a purification process such as carbonation and an ion exchange purification process.
[0004]
[Problems to be solved by the invention]
However, there is a problem in that the amount of regenerant used to regenerate the ion exchange resin is large in the ion exchange purification process in the conventional beet factory or starch sugar factory. In recent years, a method has been proposed in which a chromatograph is installed in front of the ion exchange resin device to reduce the load on the ion exchange resin. However, if the raw sugar solution is applied to the chromatograph, salt can be reduced, but the concentration of the sugar solution This causes a problem that the amount of water to be evaporated at the time of crystallization is increased. Although a method of removing salts with an electrodialyzer is also conceivable, there is a problem that current cannot be supplied due to organic matter contamination of the anion exchange membrane, and this is not a practically usable technique.
[0005]
On the other hand, as a simple desalting method for converting raw water such as industrial water and city water into pure water, a method using a flow-through capacitor has been proposed. The liquid-passing capacitor uses an electrostatic force to remove and recover (regenerate) ionic components in the liquid to be treated, and its principle is as follows. In other words, a liquid-flowing capacitor is removed by applying a DC voltage to the pair of electrodes it holds and adsorbing ionic components, charged particles, or organic substances in the liquid to be treated to the pair of electrodes. To obtain a desalted solution from which the ionic components have been removed, and then short-circuit the pair of electrodes or reversely connect a DC power source to release the ionic components adsorbed on the pair of electrodes and regenerate the pair of electrodes. However, the removal ion component is repeatedly collected as a concentrated liquid together with the liquid to be treated in the liquid. However, as described above, although it is known that a liquid-flow condenser can be used for desalting raw water such as industrial water and city water, it is not known to be used for purification of sugar liquid.
[0006]
Accordingly, an object of the present invention is to provide a method and an apparatus for purifying a sugar solution that can efficiently remove salts without diluting the concentration of the sugar solution and can greatly reduce the amount of chemicals used.
[0007]
[Means for Solving the Problems]
In such a situation, the present inventors have intensively studied, and as a result, processed the raw sugar solution with a liquid condenser or passed the raw sugar liquid through the liquid condenser and included in the raw sugar liquid. If the salt is removed roughly, and then the purified liquid of the flow-through condenser is further processed with an ion exchange resin device, the salt can be removed efficiently without reducing the concentration of the sugar solution, greatly increasing the amount of chemical used. The present inventors have found that it can be reduced and have completed the present invention.
[0008]
That is, in the present invention (1), the raw sugar solution is applied to a pair of electrodes by applying a DC voltage to remove the ionic component of the liquid to be treated, and the pair of electrodes are short-circuited or a DC power source is reversely connected. Thus, the present invention provides a method for purifying a sugar solution, characterized in that the removed ionic component is treated with a flow-through condenser for collecting the removed ionic component into a liquid to be treated or water for collection. By adopting such a configuration, regeneration can be performed without diluting the sugar solution concentration and without using a drug, and since this regeneration can also be performed in a short time, a purified solution can be obtained semi-continuously.
[0009]
In addition, the present invention (2) provides the method for purifying a sugar solution according to the above (1), wherein the purified solution of the flow-through capacitor is treated with a strongly basic anion exchange resin. . By adopting such a configuration, the first-stage flow-through capacitor has the same effects as the above invention, and the sugar solution is decolorized by the second-stage strongly basic anion exchange resin, so that a decolored purified solution can be obtained. it can.
[0010]
Moreover, this invention (3) processes the refinement | purification liquid of the said flow-through capacitor | condenser with the ion exchange resin which mixed strong acid cation exchange resin and weakly basic anion exchange resin, or it processes with strong acid cation exchange resin. Then, a method for purifying a sugar solution according to the above (1) is provided, which is then treated with a weakly basic anion exchange resin. By adopting such a configuration, particularly in starch sugar, a purified solution can be efficiently obtained without causing alkali decomposition or alkali isomerization, and can be processed at a temperature of 40 ° C. or higher. Can be prevented from spoilage due to the propagation of microorganisms.
[0011]
Moreover, this invention (4) processes the refinement | purification liquid of the said flow-through capacitor | condenser with the ion exchange resin which mixed strong basic anion exchange resin and weakly acidic cation exchange resin, or is strong basic anion exchange resin. The method for purifying a sugar solution according to the above (1) is characterized in that it is treated and then treated with a weakly acidic cation exchange resin. By adopting such a configuration, particularly in sucrose, a purified solution can be efficiently obtained without causing acid decomposition and can be processed at a temperature of 40 ° C. or higher. Prevents spoilage caused by breeding.
[0012]
In the present invention (5), a DC voltage is applied to the pair of electrodes to remove the ionic component of the liquid to be treated, and the pair of electrodes are short-circuited or removed by reversely connecting a DC power source. Liquid component condenser that collects the ionic components in the liquid to be treated or water for collection, and an ion exchange resin device filled with a strongly basic anion exchange resin, and the raw sugar solution is passed in this order. An apparatus for purifying a sugar solution is provided. By adopting such a configuration, the invention (2) can be reliably implemented.
[0013]
Further, in the present invention (6), a DC voltage is applied to the pair of electrodes to remove the ionic component of the liquid to be treated, and the pair of electrodes are short-circuited or removed by reverse connection of a DC power source. A raw-material sugar solution comprising a liquid-flowing type condenser that collects the ionic components in a liquid to be treated or water for collection, and an ion-exchange resin device filled with a strongly acidic cation exchange resin and a weakly basic anion exchange resin. Are provided in this order to provide a sugar solution purifier. By adopting such a configuration, the invention of (3) can be reliably implemented.
[0014]
In the present invention (7), a DC voltage is applied to the pair of electrodes to remove the ionic component of the liquid to be treated, and the pair of electrodes are short-circuited or removed by reversely connecting a DC power source. A raw-material sugar solution comprising a liquid-flowing type condenser that collects the ionic components in a liquid to be treated or water for collection, and an ion-exchange resin device filled with a strongly basic anion exchange resin and a weakly acidic cation exchange resin. Are provided in this order to provide a sugar solution purifier. By adopting such a configuration, the invention (4) can be reliably implemented.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
In the first method for purifying a sugar solution according to the present invention, a raw material sugar solution is subjected to a direct current voltage applied to at least a pair of electrodes to remove ionic components of the liquid to be treated, and the pair of electrodes are short-circuited or A DC power supply is reversely connected, and the removed ionic component is treated with a liquid-pass condenser that collects the removed ionic component in a liquid to be treated or water for recovery.
[0016]
Examples of the sugar solution include glucose, isomerized sugar including glucose and fructose, starch sugar such as sugar beet sugar, syrup, sorbitol, lactose, sucrose, various oligosaccharides, and the like.
[0017]
There are no particular restrictions on the liquid-passing capacitor, but a pair of electrodes in which a high surface area activated carbon is in contact with a collector electrode of metal, graphite or the like is housed in a column, and a non-conductive spacer is interposed between the pair of electrodes. It has been made. And this liquid flow type capacitor connects a direct-current power supply to a pair of electrodes, and when a liquid to be treated containing ions is passed through the column in a state where a direct-current voltage, for example, 1 to 2 V is applied, Can adsorb ions and remove the ionic component to obtain a purified solution. Thereafter, when the pair of electrodes are short-circuited, the electrically neutralized and adsorbed ions are separated from the pair of electrodes, In addition to regenerating the electrode, a concentrated solution in which a concentrated ionic component is recovered can be obtained. In addition, the voltage applied between a pair of electrodes can be set arbitrarily.
[0018]
An example of a first sugar liquid refining apparatus having such a liquid-flow condenser will be described with reference to FIG. FIG. 1 is a flow diagram of the first sugar solution purification apparatus. In FIG. 1, the upstream side of the liquid-flow condenser 1 is connected to a liquid feed pump 3 for quantitatively supplying water to be treated through a safety pipe 4 having an absolute pore diameter of 10 μm on the way through a supply pipe 7. The downstream side of the liquid-flow condenser 1 is connected to the liquid quality monitoring device 5 by a discharge pipe 8, and the discharge pipe 9 of the liquid quality monitoring device 5 is a concentration having a purified liquid discharge pipe 11 having a switching valve 13 and a switching valve 12. The liquid discharge pipe 10 is branched into two. It should be noted that the symbols 2 and 14 are omitted in the first sugar solution purifier 20.
[0019]
The liquid-flowing capacitor 1 includes at least a pair of electrodes 30 and 31, and the electrode 30 is connected to the cathode of the DC power supply 34 through a switch 32. The pair of electrodes 30 and 31 are connected to each other via a switch 35. The operation control of the devices shown in FIG. 1 is performed by a known control device such as a sequencer or a microcomputer. As the detailed operation control, for example, a liquid passing method of a liquid passing capacitor described later is used. Can be mentioned.
[0020]
In FIG. 1, the liquid quality monitoring device 5 measures the liquid quality and is not particularly limited as long as it is a measuring instrument with an index that can accurately grasp the degree of ion removal, and includes a conductivity meter and a specific resistance meter. In this embodiment, it is a conductivity meter.
[0021]
Next, a purification method using the first sugar liquid purification apparatus will be described. In FIG. 1, when the liquid feed pump 3 is driven, the liquid to be treated which is a sugar liquid is supplied to the liquid-flowing condenser 1 through the safety filter 4 and the supply pipe 7. In the liquid-flowing capacitor 1, the switch 32 is turned on to apply a DC voltage to the pair of electrodes 30, 31, the switching valve 13 is opened, the switching valve 12 is closed, and the liquid quality monitoring device 5 is set to the monitoring state. . At this stage, the flow-through capacitor 1 enters a refining process (ion component removal process), and the liquid to be treated is adsorbed by the pair of electrodes 30 and 31 of the flow-through capacitor 1 to remove the ionic component. Is discharged through the purified liquid discharge pipe 11. In addition, the water flowing out at the beginning of this step or the sugar solution having a low sugar concentration may be drained to prevent the whole sugar solution from thinning.
[0022]
If this state continues, the ionic component is gradually adsorbed on the pair of electrodes 30 and 31 and approaches a saturated state, the ionic component removal performance decreases, and the conductivity of the purified liquid gradually increases. When the conductivity measured by the liquid quality monitoring device 5 becomes an unacceptable value for purified liquid collection, the switching valve 13 is closed, the switching valve 12 is opened, the switch 32 is immediately turned off, and the flow-through capacitor 1 is connected. The application of the DC voltage is stopped, and the switch 35 is turned on to short-circuit the pair of electrodes 30, 31 or reversely connect the DC power source 34 to separate the adsorbed ion component from the pair of electrodes 30, 31 to be processed. The pair of electrodes 30 and 31 is regenerated by moving to the liquid side. That is, the liquid-flowing capacitor 1 enters a concentration process (ionic component recovery process), and the concentrated liquid in which the ionic components are concentrated is discharged out of the system through the concentrated liquid discharge pipe 10. In addition, it is preferable to replace and recover the in-apparatus sugar solution with insufficient purification just before the purification step (ion component removal step) is completed, and then enter the concentration step (ion component recovery step).
[0023]
The purification step (removal step) and the concentration step (recovery step) are defined as one cycle, and this cycle is repeated to recover the purified liquid from which the ionic components have been removed from the liquid to be treated and the removed ionic components. A concentrated solution having a high ion concentration is obtained, and the pair of electrodes 30 and 31 of the flow-through capacitor 1 are repeatedly saturated and regenerated.
[0024]
Such a liquid passing type capacitor is disclosed in Japanese Patent Laid-Open No. 5-258992. In this example of the known example, an inlet for introducing a liquid to be processed into a column and a liquid from which ion components have been removed are discharged. An outlet is provided, and the pair of electrodes is accommodated in the column. In both of these pairs of electrodes, a high surface area conductive surface layer is supported on a conductive support layer, and a nonconductive porous spacer is further included. Therefore, a pair of electrodes is a non-conductive porous spacer of one electrode, a conductive support layer, a high surface area conductive surface layer, a non-conductive porous spacer of the other electrode, a conductive support layer, a high surface area conductive. The surface layer has a six-layer structure. The pair of electrodes is wound around a hollow porous central tube with a high surface area conductive surface layer inside to form a cartridge. A lead wire extends from the conductive support layer of one electrode and the conductive support layer of the other electrode to the outside of the column and is connected to a DC power source. Is connected to a switching valve for separating the desalted liquid from which the ionic component has been removed and the concentrated liquid from which the ionic component has been recovered.
[0025]
Furthermore, as another example of the structure of the liquid-permeable capacitor, a pair of electrodes that are activated carbon layers mainly composed of high specific surface area activated carbon are arranged with a spacer made of a non-conductive porous liquid-permeable sheet interposed therebetween, A pair of collector electrodes are arranged outside the electrodes, and a flat plate shape is arranged with a holding plate arranged outside the collector electrodes. A DC power source is connected to the collector electrodes, and a short circuit between the collector electrodes or reverse connection of the DC power source is performed. It may be what performs. Further, the electrode and the collector electrode may be integrated.
[0026]
In the second method for purifying a sugar solution according to the present invention, the raw sugar solution is treated with a flow-through condenser similar to that described above, and the purified solution of the fluid-flow condenser is further treated with a strongly basic anion exchange resin. Is. That is, the second sugar solution purifying apparatus is that a strongly basic anion exchange resin apparatus is installed in the subsequent stage of the first sugar liquid purifying apparatus. In FIG. 1, symbol 2 indicates a strongly basic anion exchange resin. It is a device and is connected to the liquid-flowing capacitor 1 by a purified liquid discharge pipe 11. Symbol 14 is an outflow pipe.
[0027]
The strongly basic anion exchange resin apparatus is installed for the purpose of decolorizing the sugar solution. Specific examples of strongly basic anion exchange resins include Amberlite (registered trademark, the same applies hereinafter) IRA-402BL, IRA-900, IRA-411S, XT-5007, Diaion (registered trademark, same applies hereinafter) PA312, etc. Is exemplified. The strongly basic anion exchange resin, particularly a porous R-Cl ^- be in the form of a strongly basic anion exchange resin, the feed solution is high temperature usually 70 ° C., that it has a heat resistance to withstand this Is preferable. The conditions other than the temperature at which the purified liquid of the flow-through capacitor is treated with the strongly basic anion exchange resin are not particularly limited and are usually used.
[0028]
In the second method for purifying the sugar solution, a purified solution is obtained from the purification step of the first-stage flow-through condenser, and then this purified solution is passed through the second-stage strongly basic anion exchange resin apparatus. In the basic anion exchange resin apparatus, the coloring component can be removed to obtain a decolorizing liquid.
[0029]
In the third method for purifying the sugar solution, the raw material sugar solution is treated with a flow-through capacitor similar to the above, and the purified solution of the flow-through capacitor is further treated with a strongly acidic cation exchange resin and a weakly basic anion exchange resin. Or a strongly acidic cation exchange resin, and then a weakly basic anion exchange resin. That is, the third sugar solution purifying apparatus uses a strongly acidic cation exchange resin and a weakly basic anion exchange resin instead of the strongly basic anion exchange resin apparatus installed in the subsequent stage of the second sugar liquid purifying apparatus. The point is that an ion exchange resin apparatus filled with is installed.
[0030]
Examples of the sugar solution in the third sugar solution purification method include the same as those exemplified in the first sugar solution purification method, and among these, starch sugar or lactose causes alkaline decomposition as described later. It is preferable in that it can be purified without any problems.
[0031]
The ion exchange resin device used here is a mixed bed type in which a strongly acidic cation exchange resin and a weakly basic anion exchange resin are mixed, or a strongly acidic cation exchange resin on the upstream side and a weakly basic anion exchange on the downstream side. A two-layered form filled with resin is used.
[0032]
Specific examples of the strongly acidic cation exchange resin include Amberlite IR-120B, Amberlite 200C, Diaion SKIB, and the like. Specific examples of the weakly basic anion exchange resin include Amberlite IRA-68, IRA-93ZU, IRA-94S and Diaion WA30. The conditions for treating the purified liquid of the flow-through capacitor with the ion exchange resin are not particularly limited, and are usually used conditions.
[0033]
In the third method for purifying the sugar solution, the salt is roughly removed by the first-stage liquid-flow condenser, and then the remaining salts are removed by the ion-exchange resin device filled with the ion-exchange resin in the second stage. The salt removal rate in the former stage and the salt removal rate in the latter stage are not particularly limited, but 50 to 90%, preferably 70 to 90% of the salt contained in the raw material sugar liquid is removed by the former stage flow-through condenser, The removal of the remaining salts in the subsequent ion exchange resin device enables an electrically efficient operation of the previous stage flow-through capacitor, and the load on the subsequent ion exchange resin device does not increase so much. Both advantages of extending the period until regeneration or replacement with a new product can be exhibited. In the latter stage, the method does not use a strong basic anion exchange resin, so there is no risk of sugar isomerization or decomposition, and the use of a weak basic anion exchange resin increases the throughput. There is an effect that it is significantly superior to the case of using a strongly basic anion exchange resin.
[0034]
In the fourth method for purifying the sugar solution, the raw material sugar solution is treated with a flow-through capacitor similar to the above, and the purified solution of the flow-through capacitor is further treated with a strongly basic anion exchange resin and a weakly acidic cation exchange resin. Are treated with a mixed ion exchange resin or treated with a strongly basic anion exchange resin and then treated with a weakly acidic cation exchange resin. In other words, the fourth sugar solution purification apparatus uses a strongly basic anion exchange resin and a weakly acidic cation exchange resin instead of the strong base anion exchange resin apparatus installed at the subsequent stage of the second sugar solution purification apparatus. It is in the point which installed the ion exchange resin apparatus with which it filled.
[0035]
Examples of the sugar solution in the fourth sugar solution purification method include those exemplified in the first sugar solution purification method. Among these, sucrose and oligosaccharides, particularly raffinose, kestose, Oligosaccharides containing sucrose units such as nystose and galactosyl sucrose are preferable in that they can be purified without causing acid degradation as described later.
[0036]
The ion exchange resin device used here is a mixed bed type in which a strongly basic anion exchange resin and a weakly acidic cation exchange resin are mixed, or a strongly basic anion exchange resin on the upstream side and a weakly acidic cation exchange on the downstream side. A two-layered form filled with resin is used.
[0037]
Specific examples of strongly basic anion exchange resins include Amberlite IRA402BL and Diaion PA308. Specific examples of the weakly acidic cation exchange resin include Amberlite IRC-76, IRC-50, Levacit (registered trademark) CNP-80, Diaion WK11, and the like. The conditions for further treating the purified solution of the flow-through capacitor with the ion exchange resin are not particularly limited, and are the conditions usually used.
[0038]
In the fourth method for purifying the sugar solution, the salt is roughly removed by the first-stage flow-through condenser, and then the remaining salts are removed by the ion-exchange resin device filled with the ion-exchange resin in the second stage. The removal rate of the salts in the former stage and the removal rate of the salts in the latter stage are 50 to 90%, preferably 70 to 90, contained in the raw material sugar liquid in the first stage liquid-flow condenser, as in the third sugar liquid purification method. % Of the salt, and then the remaining salt in the ion exchange resin device in the latter stage can be electrically operated efficiently in the former stage and the ion exchange resin device in the latter stage. Both of the advantages that the load does not become so large and the period until regeneration or replacement with a new one is extended can be exhibited. Moreover, since it is the method which does not use a strongly acidic anion exchange resin in the latter stage, there exists an effect of preventing a hydrolysis of a sucrose molecule | numerator.
[0039]
Further, in addition to the ion exchange treatment or in place of the ion exchange treatment, a low-temperature liquid passing method performed in a conventional beet factory, that is, a treatment temperature of less than 40 ° C., preferably 4 to 10 ° C. Use a method of treating with a strongly acidic cation exchange resin and a weakly basic anion exchange resin at a temperature, or treating with a strongly acidic cation exchange resin and then treating with a weakly basic anion exchange resin. You can also. Thereby, even if a strongly acidic cation exchange resin is used, since it is a treatment at a low temperature, it can be purified without causing acid decomposition.
[0040]
In the present invention, the liquid-flow type capacitor applies a DC voltage to a pair of electrodes, or short-circuits the pair of electrodes or reversely connects a DC power source, but the pair of electrodes means at least a pair of electrodes, A plurality of pairs of electrodes may be provided, a DC voltage may be applied thereto, a plurality of pairs of electrodes may be short-circuited, or a DC power supply may be reversely connected. Moreover, you may make it obtain a refinement | purification liquid or a concentrated liquid continuously by installing several units | sets of a liquid-flow type capacitor | condenser in parallel.
[0041]
In the present invention, an ultrafiltration membrane device or an activated carbon device can also be installed in front of the liquid-flowing capacitor. As a result, stains such as a pigment component and an organic component contained in the raw sugar solution are removed in advance, so that the effective area of the electrode of the liquid-passing capacitor can be maintained as it is, and stable salts can be removed.
[0042]
【Example】
EXAMPLES Next, the present invention will be described more specifically with reference to examples. However, this is merely an example and does not limit the present invention.
[0043]
Example 1
The following raw sugar solution was used as a liquid to be treated, and purified using the sugar solution purification apparatus having a flow as shown in FIG. In FIG. 1, symbol 2 is an ion exchange resin apparatus having the following specifications.
(Purification conditions)
-Raw sugar solution: Beet sugar solution (Bx18.0wt / wt%, ash content of solid 3.15%, conductivity 2,800 μS / cm)
・ Specification and operating condition equipment of liquid-flow type capacitor; total activated carbon amount of activated carbon electrode manufactured by Kansai Thermal Chemical Co., Ltd.
Applied voltage: DC 1.2V
Treatment liquid flow rate: 300 ml / min operation method: Conductivity was monitored with a conductivity meter, and operation was performed so as to obtain a purified liquid having a purification rate (desalting rate) of 90% from the purification step.
-Ion exchange resin apparatus; It processed in order of a numerical value with the serial connection apparatus of the following 4 tower columns.
In addition, experimentally, the stored purified solution of the flow-through capacitor was continuously used.
(1) Strong acid cation exchange resin tower (resin amberlite IR-124, capacity 2,000ml)
(2) Weakly basic anion exchange resin tower (resin amberlite IRA-478, capacity 2,000ml)
(3) Strongly basic anion exchange resin tower (resin Amberlite IRA-402BL, capacity 2,000 ml)
(4) Weakly acidic cation exchange resin tower (resin amberlite IRC-76, capacity 600ml)
Temperature conditions: (1) and (2) above are at 6 ° C, (3) and (4) above are at a temperature of 60 ° C; 10,000ml / hour, evaluation method; Purified sugar with conductivity of 5μS / cm The amount of liquid that could be continuously obtained was determined.
[0044]
Comparative Example 1
The same procedure as in Example 1 was performed except that the treatment of the liquid-flow type capacitor was omitted.
[0045]
The properties of the purified sugar solution obtained from the purification process of the flow-through capacitor in Example 1 were Bx18.0 wt / wt% and the ash content in the solid content was 0.2%. In addition, the liquid flow rate in Example 1 was 360 L, the liquid flow rate in Comparative Example 1 was 30 L, and Example 1 was able to process 12 times the amount of Comparative Example 1.
[0046]
【The invention's effect】
According to the present invention, salts can be removed efficiently without reducing the concentration of sugar solution, and the amount of chemicals used can be greatly reduced.
[Brief description of the drawings]
FIG. 1 is a flowchart showing a processing method of a first sugar solution purifying apparatus of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flow-through type capacitor 2 Ion exchange resin device 3 Liquid feed pump 4 Safety filter 5 Liquid quality monitoring device 7 Supply pipe 8, 9 Connection pipe 10 Concentrate discharge pipe 11 Purified liquid discharge pipe 12, 13 Switching valve 14 Outflow pipe

Claims (7)

The raw sugar solution is applied to a pair of electrodes by applying a DC voltage to remove the ionic components of the liquid to be treated, and the paired electrodes are short-circuited or a DC power source is reversely connected to remove the removed ionic components. A method for purifying a sugar solution, characterized in that the treatment is carried out with a flow-through condenser that collects the liquid to be treated or the water for collection. The method for purifying a sugar solution according to claim 1, wherein the purified solution of the liquid-flow condenser is treated with a strongly basic anion exchange resin. The purified solution of the flow-through capacitor is treated with an ion exchange resin obtained by mixing a strong acid cation exchange resin and a weak base anion exchange resin, or treated with a strong acid cation exchange resin, and then a weak base anion exchange resin. The method for purifying a sugar solution according to claim 1, wherein The purified solution of the flow-through capacitor is treated with an ion exchange resin obtained by mixing a strongly basic anion exchange resin and a weakly acidic cation exchange resin, or treated with a strongly basic anion exchange resin, and then a weakly acidic cation exchange resin. The method for purifying a sugar solution according to claim 1, wherein A DC voltage is applied to the pair of electrodes to remove the ionic component of the liquid to be treated, and the paired electrodes are short-circuited or a DC power supply is reversely connected to pass the removed ionic component in the liquid. A sugar solution characterized by comprising a flow-through condenser for collecting in a treatment liquid or water for recovery and an ion exchange resin device filled with a strongly basic anion exchange resin, and the raw sugar solution is passed in this order. Purification equipment. A DC voltage is applied to the pair of electrodes to remove the ionic component of the liquid to be treated, and the paired electrodes are short-circuited or a DC power supply is reversely connected to pass the removed ionic component in the liquid. It is equipped with a flow-through condenser that collects in the treatment liquid or recovery water, and an ion-exchange resin device tower filled with a strongly acidic cation exchange resin and a weakly basic anion exchange resin, and the raw sugar solution is passed in this order. An apparatus for purifying a sugar solution characterized by the above. A DC voltage is applied to the pair of electrodes to remove the ionic component of the liquid to be treated, and the paired electrodes are short-circuited or a DC power supply is reversely connected to pass the removed ionic component in the liquid. It is equipped with a flow-through type condenser that collects in the treatment liquid or recovery water, and an ion-exchange resin device filled with a strongly basic anion exchange resin and a weakly acidic cation exchange resin, and the raw sugar solution is passed in this order. A device for purifying a sugar solution.

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