JP5069606B2 - Sugar liquid decolorization equipment - Google Patents

Description

  The present invention relates to a decolorization device for a sugar solution.

  In the manufacturing process of sugar liquid, removal of pigments derived from raw materials or produced in the manufacturing process is important for obtaining high-quality products, and color value is one of the important management items especially for manufacturing sucrose crystals. . Decoloring agents used for decolorizing sucrose liquid include granular activated carbon, bone charcoal, and ion exchange resin. Activated carbon and bone charcoal adsorb pigments with large molecular weights, and have a large adsorption capacity of pigments. On the other hand, the ion exchange resin adsorbs a dye having a relatively small molecular weight and strongly adsorbs the dye, but has a small adsorption capacity. For this reason, activated carbon and bone charcoal are used for roughing a liquid with a high pigment load, and ion exchange resin is used for finishing decolorization.

  As the ion exchange resin, a chloride ion type basic anion exchange resin is generally used. Decolorization is performed by passing a sugar solution in a downward flow from the upper part of the tower to the lower part of the tower filled with an ion exchange resin. When the adsorption capacity of the ion exchange resin decreases, regeneration is performed to elute the dye adsorbed on the ion exchange resin. A sodium chloride aqueous solution is used as the regenerant, and it is regenerated by passing the solution downward from the top of the tower. In addition, as a regenerant, sodium hydroxide may be added to a sodium chloride aqueous solution.

  As the basic anion exchange resin, a basic anion exchange resin having quaternary ammonium as a functional group is usually used. The basic anion exchange resin includes a styrenic basic anion exchange resin (hereinafter referred to as a styrene resin) whose resin base is a styrene-divinylbenzene copolymer, and an acrylic-divinylbenzene copolymer as the resin base. There are acrylic basic anion exchange resins (hereinafter referred to as acrylic resins). Styrenic resins have a feature that they are suitable for finish decolorization because they have a strong dye adsorption force but are difficult to regenerate. Acrylic resins have a feature that they are suitable for roughing of pigments because they have a weak pigment adsorption force but are easy to regenerate. Utilizing such characteristics, a high decolorization rate column liquid can be obtained by passing the sugar solution passed through the resin tower filled with the acrylic resin through the resin tower filled with the styrene resin. A decoloring apparatus has been reported (for example, Non-Patent Document 1).

Such decolorization equipment has an acrylic resin in the previous stage, so the load on the styrene resin, which is difficult to regenerate, is small, and the irreversible adsorption that causes the performance degradation is reduced. Use period until replacement becomes longer. Regeneration is performed by a method of passing a regenerant in a downward flow in parallel to an acrylic resin and a styrene resin, and a method of passing a regenerant in a down flow in series in the order of styrene resin-acrylic resin. . The latter has the advantage that the resin can be efficiently regenerated with a small amount of regenerant.
Lief Ramm-Schmidt, Erkki Talbitie, Matti Tylli, Erkki Luoma, “Experience of Polystyrene and Acrylic Resin Journal” (International Sugar Journal), 1989, Vol. 91, no. 1084, p. 65-70

However, the decolorizing device that passes the sugar solution in the order of acrylic resin and styrene resin shows excellent decoloring performance, but the installation cost increases because two resin towers are installed, and the installation space Needs to be expanded. In addition, since the regeneration of the styrenic resin with low regeneration efficiency is performed in the same downward flow as the liquid flow, the regeneration efficiency is low, and the dye remaining at the bottom of the resin tower without being regenerated leaks into the sugar solution, It will raise the color value of the sugar solution. In order to reduce the color value of the sugar solution as much as possible, there is a problem that the frequency of regeneration is increased and an excessive amount of the regenerant is required, resulting in an increase in running cost.
SUMMARY OF THE INVENTION The present invention is directed to a sugar liquid decolorizing apparatus that can obtain high decoloring performance at low cost.

The sugar liquid decoloring apparatus of the present invention is a sugar liquid decoloring apparatus having a resin tower for decoloring by bringing a sugar liquid to be treated into contact with a basic anion exchange resin, wherein the resin tower is separated by an upper part by a partition member. The upper chamber is filled with an acrylic basic anion exchange resin in a space above the upper chamber, and the lower chamber is filled with a styrene basic anion exchange. Resin is filled to form a space above the lower chamber, and an intermediate collector is embedded in the styrene basic anion exchange resin in the lower chamber, and the acrylic basic anion exchange resin is basic. the regenerant for reproducing the anion exchange resin was passed through the column at downflow, means for discharging waste regenerant from said intermediate collector, the styrenic basic anion exchange resin is filled below the intermediate collector The regenerant for reproducing the basic anion-exchange resin was passed through the column at ascending flow, the waste of regenerant have a, and means for discharging from the intermediate collector, the styrene basic anion exchange resin, said intermediate collector The basic anion exchange resin covering the upper surface of the substrate is a weakly basic anion exchange resin, and the basic anion exchange resin filled below the intermediate collector is a strongly basic anion exchange resin .
It is preferable to have means for passing the waste liquid of the regenerant that has passed through the styrenic basic anion exchange resin filled below the intermediate collector to the upper chamber in a downward flow.
It is preferable to discharge from the intermediate collector both the styrene-based basic anion exchange resin and the regenerated waste liquid by means of passing a regenerant for regenerating the basic anion exchange resin in an upward flow.

  According to the decoloring apparatus of the present invention, high decoloring performance can be obtained at low cost.

  An example of an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic view of a decolorization device 8 (hereinafter simply referred to as a decolorization device) for a sugar solution according to an embodiment of the present invention. As shown in FIG. 1, the decoloring device 8 includes a resin tower 10, a storage tank 60, a sugar solution supply source 22 to be processed, regenerant supply sources 24 and 52, washing water supply sources 26 and 54, and purified sugar. A liquid storage tank 58.

  The resin tower 10 is partitioned by a partition member 30 to form an upper chamber 12 and a lower chamber 14. The upper chamber 12 includes an acrylic resin layer 102 filled with an acrylic basic anion exchange resin (hereinafter referred to as an acrylic resin). A space 101 is formed above the acrylic resin layer 102 in the upper chamber 12. A distributor 20 is installed in the space 101, and a pipe 21 is connected to the distributor 20. The pipe 21 is connected to the sugar solution supply source 22 via the valve 23, connected to the regenerant supply source 24 via the valve 25, and connected to the washing water supply source 26 via the valve 27. ing. A drainage means (not shown) is provided above the distributor 20 of the resin tower 10.

  The lower chamber 14 includes a styrene resin layer 104 filled with a styrene basic anion exchange resin (hereinafter referred to as a styrene resin). A space 103 is formed above the styrene resin layer 104 in the lower chamber 14. An intermediate collector 40 is embedded above the styrene-based resin layer 104, and pipes 42 and 44 are connected to the intermediate collector 40. The pipe 42 is connected to the storage tank 60 via the valve 43. The pipe 44 is connected to a discharge port (not shown) via a valve 45. A lower collector 50 is embedded under the styrene resin layer 104. Pipes 51 and 57 are connected to the lower collector 50. The pipe 51 is connected to the regenerant supply source 52 via the valve 53 and is connected to the cleaning water supply source 54 via the valve 55. The pipe 57 is connected to the purified sugar solution storage tank 58 via a valve 59. The storage tank 60 is connected to the pipe 21 via a valve 62 by a pipe 61.

  Here, “the means for passing a regenerant for regenerating the basic anion exchange resin in a downward flow through the acrylic basic anion exchange resin” means the regenerant supply source 24, the washing water supply source 54, , Valves 25 and 55, pipes 21 and 51, a distributor 20, an intermediate collector 40, and a lower collector 50. "Means for passing a regenerant for regenerating the basic anion exchange resin into the styrenic basic anion exchange resin filled below the intermediate collector in an upward flow" means a washing water supply source 26, The regenerant supply source 52, valves 27 and 53, pipes 21 and 51, a lower collector 50, an intermediate collector 40, and a distributor 20 are configured. “Means for passing the waste liquid of the regenerant that has passed through the styrenic basic anion exchange resin filled below the intermediate collector in a downward flow to the upper chamber” means the storage tank 60 and the pipe 21. , 42, 61, valves 43, 62, distributor 20, and intermediate collector 40.

  The partition member 30 is not particularly limited as long as it can circulate the sugar liquid to be treated, the washing water, and the regenerant, and can support the acrylic resin, and can be selected according to the particle size of the acrylic resin. . For example, it can be configured using Saran or a partition plate with a filter nozzle.

The acrylic resin filled in the acrylic resin layer 102 is not particularly limited, and can be selected in consideration of the quality of the sugar solution to be treated. It is preferable to select a strongly basic anion exchange resin. This is because the strongly basic anion exchange resin has a high adsorbing power of the dye.
The acrylic resin may be in a base (OH) form or a salt (Cl) form, but is preferably in a salt form. This is because the pH of the sugar solution fluctuates to the alkaline side when the sugar solution to be treated is passed through the OH form. In addition, the Cl form can be regenerated with an aqueous sodium chloride solution, which is economically advantageous.

Examples of the salt-form acrylic strongly basic anion exchange resin include Amberlite IRA958 (trade name), IRA458 (trade name) manufactured by Rohm and Haas, Purolite A860 (trade name) manufactured by Purolite International, LANXESS Levachit VPOC 1074 (trade name) manufactured by the company can be used. Moreover, you may fill as a mixed bed form which mixed strong basic anion exchange resin and weak basic anion exchange resin.
The structure of the resin is not particularly limited, and may be a gel type or a porous type.

The styrenic resin filled in the styrenic resin layer 104 is not particularly limited, and can be selected in consideration of the quality of the sugar solution to be treated. It is preferable to select a strongly basic anion exchange resin. This is because the strongly basic anion exchange resin has a high adsorbing power of the dye.
The styrenic resin may be in a base (OH) form or a salt (Cl) form, but is preferably in a salt form. This is because the pH of the sugar solution fluctuates to the alkaline side when the sugar solution to be treated is passed through the OH form. In addition, the Cl form can be regenerated with an aqueous sodium chloride solution, which is economically advantageous.

Examples of the salt-type styrenic strongly basic anion exchange resin include Amberlite IRA404J (trade name) manufactured by Rohm and Haas, Diaion PA308 (trade name) manufactured by Mitsubishi Chemical Corporation, and Dowex MSA- manufactured by Dow Chemical Co., Ltd. 1 (trade name) or the like can be used. Moreover, you may fill as a mixed bed form which mixed strong basic anion exchange resin and weak basic anion exchange resin.
The structure of the resin is not particularly limited, and may be a gel type or a porous type.

The ratio of the space 101 to the volume of the upper chamber 12 is preferably 30 to 50% by volume. If it is less than 30% by volume, the resin may not flow sufficiently during backwashing, and the resin may not be sufficiently washed. If it exceeds 50% by volume, the proportion of the space 101 in the upper chamber 12 becomes too large, and the decoloring device 8 is undesirably enlarged.
The ratio of the space 103 to the volume of the lower chamber 14 is preferably 30 to 50% by volume. If it is less than 30% by volume, the resin may not flow sufficiently during backwashing, and the resin may not be sufficiently washed. If it exceeds 50% by volume, the proportion of the space 103 occupying the lower chamber 14 becomes too large, and the decolorizing device 8 is enlarged. In addition, with the increase in the size of the decolorizing device 8, the amount of the sugar solution to be treated and the washing water staying in the resin tower 10 increases at the beginning and at the end of the liquid passage, which is not preferable.

The intermediate collector 40 is a device that collects the regenerant and washing water that has been passed through the acrylic resin layer 102 in a downward flow and the regenerant and washing water that has been passed through the styrene resin layer 104 in an upflow. . Examples of the intermediate collector include a pipe in which a plurality of holes are provided, and a water-permeable synthetic resin cloth such as saran is wound, and the plurality of pipes are arranged substantially parallel to the top surface.
The installation position of the intermediate collector 40 is not particularly limited, but is preferably embedded at a position within 500 mm from the top surface of the styrene resin layer 104. If it exceeds 500 mm, the amount of the resin that does not come into contact with the regenerant that has flowed in the upward flow from the bottom of the resin tower 10 during backwashing increases, and the regeneration efficiency decreases.

  The distributor 20 is a device that supplies the sugar solution to be treated, the regenerant, and the cleaning water from the upper surface of the acrylic resin layer 102. The distributor 20 is not particularly limited, and a known one can be used.

  The lower collector 50 collects the purified sugar solution purified by circulating the acrylic resin layer 102 and the styrene resin layer 104 in a downward flow, and the regenerant and the washing water in an upward flow as the styrene resin layer. 104 is a device that passes liquid, and the same one as the intermediate collector 40 can be used.

  The drainage means provided in the resin tower 10 is not limited as long as it can drain the washing water at the time of backwashing and prevents the resin from flowing out of the resin tower 10. For example, the top surface of the resin tower 10 A hole may be provided in the pipe and connected to the pipe as it is, or the hole may be covered with a net-like salan or wire for the purpose of preventing resin outflow.

Next, a method for decolorizing the sugar liquid by the sugar liquid decoloring device 8 will be described.
First, the valves 23 and 59 are opened, the valves 25, 27, 43, 45, 53, 55, and 62 are closed, and the processed sugar solution is allowed to flow from the processed sugar solution supply source 22 to the pipe 21. The sugar solution to be treated flows through the pipe 21 to the distributor 20 and is supplied from the distributor 20 to the upper chamber 12. The sugar solution to be treated supplied to the upper chamber 12 flows while diffusing in the acrylic resin of the acrylic resin layer 102 in a downward flow, permeates the partition member 30 and flows into the lower chamber 14. During this time, a part of the pigment in the sugar solution to be treated is adsorbed by the acrylic resin, and roughing is performed.

  Next, the sugar solution to be processed that has reached the lower chamber 14 circulates in a downward flow while diffusing through the styrene resin of the styrene resin layer 104 and reaches the bottom of the resin tower 10. During this time, the pigment in the sugar solution to be treated, which has not been removed by the acrylic resin, is adsorbed on the styrene resin to become a purified sugar solution. The purified sugar solution is collected by the lower collector 50 and sent to the purified sugar solution storage tank 58 via the pipe 57.

  After performing the decoloring step for an arbitrary period, the valves 27 and 59 are opened, the valves 23, 25, 43, 45, 53, 55 and 62 are closed, and the water is supplied as water for extrusion from the washing water supply source 26. Water is poured into the pipe 21. The washing water reaches the distributor 20 from the pipe 21 and is supplied from the distributor 20 to the upper chamber 12. The washing water supplied to the upper chamber circulates in the resin tower 10 in a downward flow, and pushes the sugar liquid to be treated in the resin tower into the purified sugar liquid storage tank 58. During this time, the sugar solution to be treated is decolored by circulating the acrylic resin and the styrene resin in order while diffusing (the decoloring step).

  Next, the valve 55 is opened, and the valves 23, 25, 27, 43, 45, 53, 59, 62 are closed. From the cleaning water supply source 54, the cleaning water is passed through the pipe 51. The washing water that has flowed into the pipe 51 is supplied from the lower collector 50 to the lower chamber 14 and flows through the styrene resin layer 104 in an upward flow. During this time, the washing water flows through the styrene resin and takes in foreign substances and turbidity accumulated in the styrene resin. The washing water that has flowed through the styrene resin layer 104 in an upward flow passes through the partition member 30 and flows into the upper chamber 12. The washing water that has flowed flows through the acrylic resin layer 102 in an upward flow. During this time, the washing water takes in foreign substances and turbidity accumulated in the acrylic resin while flowing through the acrylic resin. Then, the washing water is discharged out of the resin tower 10 by drain means (not shown) provided in the upper part of the upper chamber 12 (the reverse washing process).

Next, the valves 27, 43, 53 are opened, and the valves 23, 25, 45, 55, 59, 62 are closed. At the same time as the regenerant is supplied from the regenerant supply source 52 to the pipe 51, the wash water is supplied from the wash water supply source 26 to the pipe 21. The regenerant that has flowed through the pipe 51 is supplied from the lower collector 50 to the lower chamber 14, flows in an upward flow while diffusing through the styrene resin of the styrene resin layer 104, and reaches the intermediate collector 40. During this time, the dye adsorbed on the styrene resin elutes and is taken into the regenerant.
On the other hand, the wash water that has flowed into the pipe 21 is supplied from the distributor 20 to the upper chamber 12, flows through the acrylic resin layer 102 in a downward flow, passes through the partition member 30, and flows into the lower chamber 14. Then, it reaches the intermediate collector 40 from the top surface of the styrene resin layer 104.

  Thus, the wash water supplied from the distributor 20 passes from above the intermediate collector 40 via the styrene resin, and the regenerant supplied from the lower collector 50 passes from below the intermediate collector 40 via the styrene resin. It acts to apply water pressure to. Then, the regenerant and the wash water are collected by the intermediate collector 40 and stored in the storage tank 60 as a regenerated waste liquid.

Next, the valves 25, 45, 55 and 62 are opened, and the valves 23, 27, 43, 53 and 59 are closed. At the same time as the regenerant is supplied from the regenerant supply source 24 to the pipe 21, the wash water is supplied from the wash water supply source 54 to the pipe 51. Further, a pump (not shown) attached to the storage tank 60 is activated to cause the recycled waste liquid to flow through the pipe 21 via the pipe 61. The regenerant and the regenerated waste liquid that have flowed into the pipe 21 are supplied from the distributor 20 to the upper chamber 12, circulate in a downward flow while diffusing through the acrylic resin of the acrylic resin layer 102, and pass through the partition member 30. Then, it flows into the lower chamber 14. During this time, the dye adsorbed on the acrylic resin is eluted and taken into the regenerant. Then, from the top surface of the styrene-based resin layer 104, it flows while diffusing in the styrene-based resin covering the intermediate collector 40, and reaches the intermediate collector 40. During this time, the dye adsorbed on the styrene resin covering the intermediate collector 40 is eluted and taken into the regenerant.
On the other hand, the wash water that has flowed into the pipe 51 is supplied from the lower collector 50 to the lower chamber 14, flows in an upward flow through the styrene-based resin layer 104, and reaches the intermediate collector 40.

  Thus, the regenerant supplied from the distributor 20 passes from above the intermediate collector 40 via the styrene resin, and the wash water supplied from the lower collector 50 passes from below the intermediate collector 40 via the styrene resin to the intermediate collector 40. It acts to apply water pressure to. Then, the regenerant and the washing water are collected by the intermediate collector 40 and discharged through the pipe 44 and the valve 45 (the regeneration process).

After performing the regeneration step for an arbitrary period, the valves 27, 45, and 55 are opened, and the valves 23, 25, 43, 53, 59, and 62 are closed. At the same time as the cleaning water is supplied from the cleaning water supply source 26 to the pipe 21, the cleaning water is supplied from the cleaning water supply source 54 to the pipe 51. The washing water that has flowed into the pipe 21 is supplied from the distributor 20 to the upper chamber 12. The supplied wash water flows through the acrylic resin layer 102 in a downward flow while pushing the regenerant, passes through the partition member 30 and flows into the lower chamber 14. The washing water that has flowed into the lower chamber 14 circulates from the top surface of the styrene resin layer 104 while pushing away the regenerant in the styrene resin that covers the intermediate collector 40, and reaches the intermediate collector 40.
On the other hand, the wash water that has flowed into the pipe 51 is supplied from the lower collector 50 to the lower chamber 14, and flows through the styrene resin layer 104 in an upward flow while pushing the regenerant, and reaches the intermediate collector 40.

  The wash water circulated in the downward flow from the distributor 20 passes through the styrene resin from above the intermediate collector 40, and the wash water circulated in the up flow from the lower collector 50 passes through the styrene resin from below the intermediate collector 40. The intermediate collector 40 acts to apply water pressure. Then, the wash water circulated in the downward flow from the distributor 20 and the wash water circulated in the upward flow from the lower collector are collected in the intermediate collector 40 and discharged through the pipe 44 and the valve 45 (this is the above-described washing). Process).

  The sugar solution to be treated is not particularly limited, and examples thereof include sugar solutions in which sucrose, glucose, various oligosaccharides and the like are dissolved. The concentration of the sucrose and the like in the sugar solution to be treated is not particularly limited, but it is preferable to adjust, for example, in the range of Brix 30 to 65%. If it is less than 30%, the saccharification of the sugar solution tends to proceed in the resin tower 10 during the passage of the liquid, and the quality of the refined saccharified solution is deteriorated, and the acrylic resin layer 102 and the styrene resin layer 104 are clogged. Cause. If it exceeds 65%, the viscosity becomes too high, the contact efficiency with the basic anion exchange resin is lowered, and the removal of the pigment in the sugar solution to be treated may be insufficient.

  The flow rate of the sugar solution to be treated can be determined according to the dye concentration in the sugar solution to be treated and the color value required for the purified sugar solution, and is determined so that the bed volume (BV) is 5 or more. It is preferable. This is because if the BV is less than 5, the frequency of reproduction increases, which is economically undesirable. BV represents the amount of liquid flow in resin volume units, and BV = 1 represents the amount of liquid flow equal to the resin volume.

  The liquid passing speed of the sugar solution to be treated can be determined according to the dye concentration in the sugar liquid to be treated, the color value required for the purified sugar liquid, Brix, and the passing temperature, for example, SV = 0.5 to A range of 10 can be determined. If it is less than 0.5, the production efficiency becomes too low, and if it exceeds 10, the contact efficiency with the basic anion exchange resin is lowered, and there is a possibility that the removal of the dye in the liquid to be treated may be insufficient. .

  Although the temperature of a to-be-processed sugar liquid is not specifically limited, It is preferable to determine in the range of 40-80 degreeC. If the temperature is lower than 40 ° C., the viscosity of the sugar solution is increased, the contact efficiency between the sugar solution to be treated and the basic anion exchange resin is lowered, and there is a possibility that the pigment removal in the sugar solution to be treated is insufficient. This is because when the temperature exceeds 80 ° C., the sugar is likely to be denatured and the basic anion exchange resin is likely to deteriorate.

  The regenerant is not particularly limited as long as it can elute the dye adsorbed on the basic anion exchange resin. For example, an aqueous sodium chloride solution or an aqueous solution obtained by adding sodium hydroxide to an aqueous sodium chloride solution can be used. Although the density | concentration of sodium chloride aqueous solution is not specifically limited, For example, it is preferable to determine in 4-15 mass%. If it is less than 4% by mass, there is a possibility that the detachment of the dye from the basic anion exchange resin may be insufficient. This is because if it exceeds 15% by mass, the basic anion exchange resin may be broken due to a rapid change in osmotic pressure.

  The flow rate of the regenerant can be determined in consideration of the degree of adsorption of the dye to the basic anion exchange resin, and is preferably determined in the range of BV = 1 to 4, for example. If it is less than 1, regeneration of the basic anion exchange resin may be insufficient, and if it exceeds 4, the amount of the regenerant becomes excessive, which is economically undesirable.

  The flow rate of the regenerant is not particularly limited, but is preferably determined in the range of SV = 0.5 to 5, for example. If it is less than 0.5, it takes a long time to regenerate, and if it exceeds 5, the contact efficiency with the basic anion exchange resin decreases, and the dye may be insufficiently detached from the basic anion exchange resin. Because there is.

  The washing water is not particularly limited as long as the regenerant is washed away upon restarting the decolorization step and does not affect the quality of the purified sugar solution, and for example, pure water, tap water, industrial water, or the like can be used. .

  The flow rate of the washing water is not particularly limited, and is preferably determined in the range of BV = 2 to 10, for example. If it is less than 2, extrusion of the regenerant becomes insufficient, the regenerant is mixed into the purified sugar solution, and there is a disadvantage such as color reversion in the subsequent purification step. If it exceeds 10, the amount of washing water becomes excessive, which is economically undesirable.

  As above-mentioned, the decoloring apparatus 8 can process according to the characteristic of each resin by letting a to-be-processed sugar liquid flow in order of acrylic resin and styrene resin. That is, the rough sugar is removed with the acrylic resin layer 102 and then decolorized with the styrenic resin layer 104 having a high ability to remove the dye, so that the purified sugar liquid having a high color value is stabilized. Can be obtained. Such a decolorization method for passing an acrylic resin and a styrene resin in this order is conventionally performed in two ways: a resin tower provided with an acrylic resin layer 102 and a resin tower provided with a styrene resin layer 104. This was done using a resin tower. However, according to the present invention, the acrylic resin and the styrene resin can be passed in this order in one resin tower. For this reason, it is not necessary to expand the installation space, and the equipment cost can be reduced.

  In addition, in the regeneration process of the decolorizing device 8, there is a means for passing the regenerant through the styrene resin layer 104 in an upward flow and simultaneously passing the washing water through the acrylic resin layer 102 in a downward flow. Therefore, the styrene resin is applied by applying water pressure from below the intermediate collector 40 via the styrene resin in the upward flow and applying water pressure via the styrene resin from above the intermediate collector 40 in the downward flow. The layer 104 can be in a packed state to prevent the styrene resin from flowing. In addition, since the regenerant that has passed through the acrylic resin layer 102 and contains pigments and the like in a high concentration does not flow through the styrene resin layer 104 below the intermediate collector 40, it does not cause re-contamination of the styrene resin. Can be prevented. In addition, a method in which a styrene resin is densely packed in the lower chamber 14 and the regenerant is circulated in an upward flow is also exemplified. However, even if the packing is densely packed, the regenerant shrinks due to contact with the styrene resin, and the styrene resin flows in the regeneration process. For this reason, the diffusion of the regenerant into the styrene-based resin becomes non-uniform, the regenerant contact efficiency is lowered, and there is a possibility that the pigment is not sufficiently detached. Further, since the resin layer does not flow sufficiently at the time of reverse cleaning, foreign substances and turbidity accumulated in the styrene resin layer 104 cannot be sufficiently discharged.

  In addition, the regeneration process is performed by passing the regenerant through the styrene resin layer 104 in the counterflow of the sugar solution to be treated in the decolorization process, that is, ascending flow. For this reason, the styrene resin near the outlet of the resin tower, that is, in the vicinity of the lower collector 50 is sufficiently regenerated, and the quality of the refined sugar solution can be stabilized. In addition, a higher decolorization performance can be obtained as compared with the conventional regeneration process (liquid passage in the same direction as the liquid flow direction of the sugar solution to be treated), or 1 in the decolorization process if the same decolorization performance as in the past. The amount of liquid passing through the cycle can be increased, and the frequency of the regeneration operation can be reduced. As a result, the running cost of the decoloring device 8 can be reduced.

  In the acrylic resin layer 102, roughening of the pigment and turbidity in the sugar solution to be treated are removed. And acrylic resin has the characteristic that it is easy to reproduce | regenerate. Further, the styrene resin filled below the intermediate collector 40 has little dye adsorption, and the regenerant that circulates the styrene resin has the ability as a regenerant for the acrylic resin layer 102. . Therefore, in the decolorizing device 8, the regenerant that has circulated the styrene resin below the intermediate collector 40 in the styrene resin layer 104 is stored in the storage tank 60 and reused in the acrylic resin regeneration process. For this reason, the usage-amount of a regenerant can be reduced and running cost can be held down.

The present invention is not limited to the above-described embodiment.
In the styrene resin layer 104 in the lower chamber 14 of the desalination apparatus 8, the same styrene resin is used as the styrene resin covering the intermediate collector 40 and the styrene resin below the intermediate collector 40. May be different.
Another embodiment of the styrene resin layer will be described with reference to FIG. FIG. 2 is a schematic diagram of the resin tower 100. As shown in FIG. 2, the lower chamber 114 of the resin tower 100 has a styrenic resin upper layer 111 made of a weakly basic anion exchange resin covering the intermediate collector 40 and a strong basicity filled below the intermediate collector 40. The styrene resin layer 110 is composed of the styrene resin lower layer 112 formed of an anion exchange resin.

  A weakly basic anion exchange resin has a weaker basicity of the exchanger than a strongly basic anion exchange resin, so it is difficult to adsorb organic substances and has a high resistance to organic contamination. For this reason, the weak base anion exchange resin has little accumulation of contamination due to turbid components in the sugar liquid to be treated. Further, the weak basic anion exchange resin has a lower specific gravity than the strong basic anion exchange resin. For this reason, even if the styrene resin layer 110 is regenerated and washed in an upward flow, the styrene resin upper layer 111 is formed by the weakly basic anion exchange resin, and the contaminated resin is mixed in the styrene resin lower layer 112. There is nothing. As a result, the finished decolorization of the purified sugar solution is performed in the styrene-based resin lower layer 112 with less contamination, so that the quality such as the color value of the purified sugar solution can be further enhanced.

  Further, for example, a drainage unit may be provided in the space 103. At this time, “the means for passing the regenerant for regenerating the basic anion exchange resin in a downward flow through the acrylic basic anion exchange resin” means the draining means, the regenerant supply source 24, The cleaning water supply source 54, the valves 25 and 55, the pipes 21 and 51, the distributor 20, and the lower collector 50 are configured.

  The drainage means is not particularly limited, and is not particularly limited as long as it can recover the regenerant that has flowed down the acrylic resin layer 102 and discharge the recovered regenerator out of the resin tower 10. As the liquid draining means, for example, a pipe in which a plurality of holes are provided, or the same one as the intermediate collector 40 can be used. Further, the arrangement position of the drainage means is not particularly limited as long as it is in the space 103, but can be arranged, for example, directly under the partition member 30 or on the top surface of the styrene resin layer 104. By providing such a draining means, the regenerated agent contaminated by flowing down the acrylic resin layer 102 can be discharged from the resin tower 10 without contacting the styrene resin layer 104. However, the styrenic resin layer 104 is likely to flow in the flow of the styrenic resin layer 104 in the ascending flow of cleaning water simultaneously with the flow of the regenerant through the acrylic resin layer 102. Therefore, from the viewpoint of preventing the flow of the styrene resin layer 104, it is preferable to recover the regenerant that has passed through the acrylic resin layer 102 using the intermediate collector 40 embedded in the styrene resin layer 104. Even when the drainage means is provided, the regenerant and the washing water are extracted from the intermediate collector 40 in the regeneration process of the styrenic resin below the intermediate collector 40.

EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated concretely, it is not limited to an Example.
Example 1
Two columns with a diameter of 70 mm and a height of 1000 mm were connected to each other up and down, and an apertured Saran plate through which the ion exchange resin did not pass was fixed between the columns. The lower column used was a collector provided near the middle of the column. The upper column was filled with 2.5 L of acrylic resin Amberlite IRA958 (chloride ion form), and the lower column was filled with 2.5 L of styrene resin Amberlite IRA404J (chloride ion form) to produce decolorization column A. . At this time, the intermediate collector of the lower column was positioned 100 mm below the resin surface of the styrenic resin layer.

  After heating the sucrose solution of Brix 58-60% and ICUMSA color value 700 to 60 ° C. to the decolorization column A, 100 L was passed from the top of the decolorization column A at a flow rate of 10 L / h. A processing solution was collected from the lower portion every 20 L (decolorization step). The collected treatment liquid sample was diluted 4-fold with pure water, the Brix and absorbance at 420 nm were measured by the following formula, and ICUMSA color value was calculated.

ICUMSA color value = OD420 × 1000 / (b × c) (1)
OD420: Absorbance at a wavelength of 420 nm b: Absorbance measurement cell length (cm)
c: Density of measurement liquid (g / cm ³ )

After the sucrose solution was passed, the sucrose solution was extruded with pure water (decoloration step).
Next, as a regeneration step for the styrene resin, 3 L of a 10% by weight sodium chloride aqueous solution is used as a regenerant, and the ascending flow is passed from the bottom of the decolorization column A at a flow rate of 65 ° C. and 5 L / h, and discharged from the intermediate collector. did. After passing the regenerant, 2.5 L of pure water was passed at the same flow rate as that of the regenerant, and the sodium chloride aqueous solution in the resin layer was extruded. Simultaneously with the passage and extrusion of the regenerant, pure water was supplied from the upper part of the decoloring column A at a flow rate of 0.5 L / h and discharged from the intermediate collector. Of the waste liquid discharged from the intermediate collector, the initial 2.8 L was discarded and 3.3 L was recovered.

  Next, as the acrylic resin regeneration step, the recycled waste liquid recovered in the regenerant is used, and passed through the acrylic resin layer in a downward flow from the top of the decolorization column A at a flow rate of 65 ° C. and 5 L / h. Drained from the collector. After completion of the flow, 2.5 L of pure water was passed at the same flow rate as the regenerant, and the regenerator in the resin layer was extruded. Simultaneously with the flow and extrusion of the regenerant, pure water was supplied from the bottom of the decolorization column A at a flow rate of 5 L / h, passed through the styrenic resin layer in an upward flow, and discharged from the intermediate collector (regeneration step). .

  After passing the regenerant and extruding, pure water is supplied at 15 L / h from the top and bottom of the decolorizing column A, passed through the acrylic resin layer and styrene resin layer for 40 minutes, and discharged from the intermediate collector. (Washing process).

The combination of the decoloring step, the regeneration step, and the washing step was set to one cycle, and three cycles were performed, and the average decoloration rate of the liquid passing treatment liquid in each cycle was calculated. The results are shown in FIGS.
Decolorization rate (%) = {1− (treatment liquid ICUMSA color value ÷ stock solution ICUMSA color value)} × 100 (2)

(Comparative Example 1)
An acrylic tower was prepared in which 2.5 L of acrylic resin Amberlite IRA958 (chloride ion type) was packed in a column having a diameter of 70 mm and a height of 1000 mm. Similarly, a styrene tower in which 2.5 L of styrene resin Amberlite IRA404J (chloride ion form) was packed in a column having a diameter of 70 mm and a height of 1000 mm was produced. The lower part of the acrylic tower and the upper part of the styrene tower were connected to produce a decolorization column B.

  Under the same conditions as in Example 1, the sucrose solution was passed through the decolorization column B in the descending flow in the order from the acrylic tower to the styrene tower for decolorization. After passing the sucrose solution, the sucrose solution was extruded with pure water (decolorization step).

  Subsequently, 3 L of a 10% by mass sodium chloride aqueous solution was passed through the decolorization column B as a regenerant in a descending flow from the acrylic tower to the styrene tower at a flow rate of 65 ° C. and 5 L / h. A sodium chloride aqueous solution was extruded by passing 5 L of pure water at the same flow rate as that of the regenerant (regeneration step).

  Subsequently, pure water was passed for 60 minutes at a flow rate of 15 L / h to wash the resin layer (cleaning step). The combination of the decoloring step, the regeneration step, and the cleaning step was set to one cycle, and three cycles were performed. The results are shown in FIGS.

FIG. 3 is a graph showing the decolorization rate in each cycle. Legend (a) represents the results in Example 1, and legend (b) represents the results in Comparative Example 1.
As shown in FIG. 3, in Example 1, a decrease in the decolorization rate was hardly observed even after the cycle. On the other hand, in Comparative Example 1, the decolorization rate was gradually lowered by repeating the cycle, and the decolorization rate at the third cycle was about 5 points lower than the decolorization rate at the first cycle. From this, it was found that in Example 1, the anion exchange resin was sufficiently regenerated in each cycle.

FIG. 4 is a graph showing the relationship between the flow rate and the color value in the 3rd cycle of Example 1 and Comparative Example 1. Legend (c) represents the results of Example 1, and legend (d) represents the results of Comparative Example 1.
As shown in FIG. 4, in the third cycle, it can be seen that Example 1 has a lower ICUMSA color value than that of Comparative Example 1. For example, when the time point when the ICUMSA color value of the purified sucrose solution reached 250 was set as the end point of the decoloring treatment, it was found that the processing amount of Example 1 was approximately 1.4 times that of Comparative Example 1. .

It is a schematic diagram which shows the desalination apparatus concerning embodiment of this invention. It is a schematic diagram which shows the resin tower of the desalination apparatus concerning embodiment of this invention. 5 is a graph showing the decolorization rate of Example 1 and Comparative Example 1. 6 is a graph showing the relationship between the amount of liquid flow and color value in the third cycle of Example 1 and Comparative Example 1.

Explanation of symbols

8 Decoloring apparatus 10, 100 Resin tower 12 Upper chamber 14, 114 Lower chamber 20 Distributor 21, 42, 44, 51, 61 Piping 24, 52 Regenerant supply source 25, 27, 43, 53, 55, 62 Valve 26, 54 Washing water supply source 30 Partition member 40 Intermediate collector 50 Lower collector 60 Storage tank 102 Acrylic resin layer 104, 110 Styrene resin layer

Claims (2)

A sugar liquid decolorizing apparatus having a resin tower for decoloring by bringing a sugar liquid to be treated into contact with a basic anion exchange resin,
The resin tower is divided into an upper chamber and a lower chamber by a partition member,
The upper chamber is filled with an acrylic basic anion exchange resin to form a space above the upper chamber,
The lower chamber is filled with a styrenic basic anion exchange resin, forming a space above the lower chamber,
In the lower chamber, an intermediate collector is embedded in the styrenic basic anion exchange resin,
Means for passing a regenerant for regenerating the basic anion exchange resin in a downward flow through the acrylic basic anion exchange resin, and discharging a waste liquid of the regenerant from the intermediate collector ;
Means for passing a regenerant for regenerating the basic anion exchange resin in an upward flow through the styrenic basic anion exchange resin filled below the intermediate collector and discharging the waste liquid of the regenerant from the intermediate collector When,
I have a,
In the styrenic basic anion exchange resin, the basic anion exchange resin covering the upper surface of the intermediate collector is a weak basic anion exchange resin, and the basic anion exchange resin filled below the intermediate collector is: An apparatus for decolorizing a sugar solution , which is a strongly basic anion exchange resin .   2. The apparatus according to claim 1, further comprising means for passing the waste liquid of the regenerant that has passed through the styrenic basic anion exchange resin filled below the intermediate collector to the upper chamber in a downward flow. The decolorization apparatus of the sugar liquid as described.

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