JP5433951B2 - Reaction system and method for producing reaction product - Google Patents

Description

  The present invention relates to a reaction system for reacting a plurality of reaction precursors and a method for producing a reaction product, and more particularly to a technique for producing a slime control agent from a plurality of reaction precursors.

  A technique for producing a reaction product by reacting a plurality of reaction precursors is conventionally known (see, for example, Patent Document 1). Such technology is always required to solve problems such as suppression of by-product generation and improvement in yield of reaction products. As a premise, it is very difficult to react a plurality of reaction precursors in the expected amounts and ratios. is important.

  By the way, it is generally assumed that a reaction system that performs the above-described reaction is installed in a factory or the like that is hotter than room temperature. For this reason, in the accommodation stage before use, there is a concern that the reaction precursor is not a little decomposed. In addition, the plurality of reaction precursors contained often have different degrees of decomposition.

  On the other hand, under low temperature conditions such as in winter, there is a concern that the accommodated reaction precursor solidifies. In addition, since the freezing points of the plurality of reaction precursors contained are different from each other, the degree of solidification is often different from each other.

  For this reason, it is difficult to react a plurality of reaction precursors in an expected amount and ratio. Nevertheless, in order to appropriately adjust the amount and ratio, it is necessary to measure the concentration and state of each reaction precursor contained immediately before the reaction, but such measurement work is extremely complicated.

In order to suppress decomposition of the reaction precursor in the accommodating stage, a measure to keep the reaction precursor at a low temperature is promising. Further, in order to suppress the solidification of the reaction precursor in the accommodation stage, a measure for holding the reaction precursor at a freezing point or higher is promising. Conventionally, attempts have been made to cool or warm the reaction precursor indirectly by applying cold water or hot water from the outside to the tank containing the reaction precursor.
JP-A-5-146785

  However, in the above-described technique, the outer wall of the tank is always wet, so algae are likely to be generated on the outer wall. Then, since heat exchange between water and the reaction precursor is inhibited by the algae, there is a concern that decomposition or solidification of the reaction precursor cannot be sufficiently suppressed. Moreover, since the heat exchange efficiency with respect to the amount of water used falls, improvement is needed from a viewpoint of environmental load.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a reaction system that can sufficiently suppress decomposition or solidification of a reaction precursor and can reduce an environmental load, and a method for producing a reaction product. To do.

  The present inventors have found that the generation of algae on the outer wall of the tank is suppressed by substantially blocking the heat medium that exchanges temperature with the reaction precursor from the outside air, thereby completing the present invention. It came. Specifically, the present invention provides the following.

(1) A reaction system for reacting a plurality of reaction precursors,
A plurality of precursor vessels containing each of the reaction precursors;
Reaction means for reacting precursors from each of the precursor tanks;
Heat exchange means for exchanging heat with a reaction precursor housed in one or more heat exchange tanks selected from the plurality of precursor tanks,
The heat exchange means is provided on the outer wall of the heat exchange tank so as to be capable of conducting heat, and a flow path through which a heat medium flows;
A heating medium supply means for supplying a heating medium to the flow path,
The reaction system is substantially sealed except for an introduction port through which the heat medium is introduced and an outlet through which the heat medium is led out, connected to the heat medium supply means.

According to the invention of (1), since the flow path is provided on the outer wall of the heat exchange tank so as to be able to conduct heat, between the heat medium flowing through the flow path and the reaction precursor accommodated in the heat exchange tank. Heat exchange takes place at.
Here, since the flow path is substantially sealed except for the introduction port and the discharge port, the spore of algae floating in the outside air is suppressed from being mixed into the heat medium, and algae are generated on the outer wall of the heat exchange tank. It is suppressed. Thereby, since efficient heat exchange between the heat medium and the reaction precursor is continued, decomposition or solidification of the reaction precursor can be sufficiently suppressed, and the environmental load can be reduced.

  (2) The reaction system according to (1), wherein the flow path is formed by providing, on the outer wall, a hollow member in which a substantially sealed space except for the introduction port and the outlet port is formed.

  The substantially sealed flow path can also be formed by closely attaching a member (for example, a partial arc shape in cross section) having an open space to the outer wall of the heat exchange tank. However, in this aspect, there is a concern that the heat medium leaks from the flow path and comes into contact with the outside air as a result of insufficient adhesion between the member and the outer wall.

  Therefore, according to the invention of (2), since the flow path is formed by providing the hollow member on the outer wall, even if the adhesion between the hollow member and the outer wall becomes insufficient, the heat medium leaks from the flow path. Is unlikely to occur. For this reason, since generation | occurrence | production of algae is suppressed more reliably, decomposition | disassembly or coagulation | solidification of a reaction precursor can be suppressed more reliably, and an environmental load can be reduced more reliably.

  (3) The reaction system according to (2), wherein the hollow member is made of a flexible material having flexibility.

  According to the invention of (3), since the hollow member is made of a flexible material, the hollow member bends and adheres to the outer wall over a wide range. Thereby, since an outer wall is thermally insulated from external air, decomposition | disassembly or solidification efficiency of a reaction precursor and the reduction efficiency of an environmental load can be improved.

  (4) The reaction system according to any one of (1) to (3), further including a reflux unit that refluxes the heating medium led out from the outlet to the heating medium supply unit.

  According to the invention of (4), the heat medium led out from the lead-out port is refluxed to the heat medium supply means, and is finally introduced from the introduction port into the flow path. Thus, since the heat medium is reused, the environmental load can be further reduced.

(5) The reaction precursor includes an oxidant and a nitrogen-containing compound, and at least the oxidant is accommodated in the heat exchange tank.
The reaction system according to any one of (1) to (4), wherein the reaction means reacts the oxidizing agent and the nitrogen-containing compound to generate a slime control agent.

  A useful slime control agent used for water treatment contains a bromamine compound obtained by reacting an oxidizing agent and a nitrogen-containing compound. However, if the reaction ratio of the oxidizing agent and the nitrogen-containing compound deviates even slightly from the appropriate range, the yield of the desired bromamine compound is drastically reduced and a by-product having a low water treatment effect is generated. Moreover, since the oxidizing agent is particularly weak against temperature changes and is easily decomposed, it is very difficult to adjust the reaction ratio.

  Then, according to invention of (5), since the oxidizing agent was accommodated in the to-be-heated exchange tank, decomposition | disassembly of an oxidizing agent can fully be suppressed and an environmental load can be reduced. Thereby, the slime control agent excellent in water treatment efficiency can be produced | generated simply.

(6) A method of producing a reaction product by reacting a plurality of reaction precursors,
A flow path is provided on the outer wall of one or more heat exchange tanks selected from a plurality of precursor tanks containing each of the reaction precursors so as to conduct heat, and an introduction port and a heat medium are introduced. Almost sealed except for the outlet
The method which has the procedure which supplies a heat medium from the inlet of the said flow path.

  (7) The method according to (6), wherein the flow path is formed by providing, on the outer wall, a hollow member in which a substantially sealed space is formed inside except for the inlet and the outlet.

(8) The hollow member is made of a flexible material having flexibility,
The method is the method according to (7), wherein the hollow member is provided on the outer wall in a bent state.

  (9) The method according to any one of (6) to (8), further comprising a step of refluxing the heat medium led out from the outlet and reintroducing from the inlet.

(10) The reaction precursor includes an oxidizing agent and a nitrogen-containing compound,
In the method, at least the oxidizing agent is accommodated in the heat exchange tank,
The method according to any one of (6) to (9), further comprising a step of reacting the oxidizing agent and the nitrogen-containing compound to produce a slime control agent.

  The methods described in (6) to (10) are developed from the reaction system described in (1) to (5) as a method for generating a reaction product. Therefore, according to the inventions (6) to (10), the same effects as those of the inventions (1) to (5) can be obtained.

According to the present invention, since the flow path is provided on the outer wall of the heat exchange tank so as to conduct heat, heat exchange is performed between the heat medium flowing through the flow path and the reaction precursor accommodated in the heat exchange tank. Is done.
Here, since the flow path is substantially sealed except for the introduction port and the discharge port, the spore of algae floating in the outside air is suppressed from being mixed into the heat medium, and algae are generated on the outer wall of the heat exchange tank. It is suppressed. Thereby, since efficient heat exchange between the heat medium and the reaction precursor is continued, decomposition or solidification of the reaction precursor can be sufficiently suppressed, and the environmental load can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in description of each embodiment other than 1st Embodiment, the same code | symbol is attached | subjected about what is common in 1st Embodiment, and the description is abbreviate | omitted.

<First Embodiment>
FIG. 1 is a schematic configuration diagram of a paper making system 10 including a reaction system 50 according to the first embodiment of the present invention. As shown in FIG. 1, the papermaking system 10 includes a papermaking apparatus 11, a reaction system 50, and a white water recovery system 60. Each component will be described in detail below.

[Paper making equipment]
The papermaking apparatus 11 is an apparatus that processes raw materials into paper, and includes a raw material storage unit 20, a wet unit 30, and a drying unit 40 in order from the upstream.

(Raw material storage part)
The raw material storage unit 20 has a pulp chest 21. The recovered pulp slurry deinked by a pulper (not shown) is stored in the pulp chest 21, and the recovered pulp slurry is eventually transferred to the mixing chest 23. Since the raw material pulp slurry obtained through cooking and bleaching is also supplied to the mixing chest 23, a mixed slurry of the recovered pulp slurry and the raw material pulp slurry is created in the mixing chest 23. This mixed slurry is transferred to the wet part 30 via the machine chest 24 and the seed box 25.

  The recovered pulp slurry and raw pulp slurry contain a mixture of chemicals such as pulp fibers beaten as necessary, and fillers, yield improvers, paper strength improvers, antifoaming agents, dyes and the like.

(Wet part)
The wet part 30 includes a paper outflow part (inlet) 31. The paper outflow part 31 dilutes the mixture transferred from the raw material storage part 20 to an appropriate concentration to obtain a paper stock. Then, the paper outflow part 31 uniformly ejects the paper stock over the entire width of the dewatering part (wire part) 32. The paper stock at the time of being ejected from the paper stock outflow portion 31 usually has a water content of about 99%.

  The dewatering unit 32 includes a ring-shaped lower wire 324, and the lower wire 324 moves as the lower roll 325 rotates. Thereby, the paper material ejected from the paper material outflow part 31 is conveyed downstream (left direction in FIG. 1). Here, the dewatering unit 32 further includes an upper wire 321 that moves as the upper roll 323 rotates, and the upper wire 321 faces the lower wire 324 across the paper. The paper material conveyed by the lower wire 324 is eventually sandwiched between the upper wire 321 and the lower wire 324, dehydrated evenly on the upper and lower surfaces, and then conveyed to a pressing part (press part) 33 described later. The moisture content of the stock at the time when it is conveyed from the dehydrating unit 32 is usually about 80%.

  The pressing unit 33 includes a first pressing roll 331, an extrusion roll 333, and a second pressing roll 334 in order from the upstream side, and the first pressing roll 331 rotates in synchronization with the first transport roll 336 so that the first pressing roll 331 rotates. The wire 335 is moved, and the second pressing roll 334 rotates the second pressing wire 337 by rotating in synchronization with the second transport roll 338. Thereby, the paper conveyed to the pressing part 33 is conveyed further downstream.

  Moreover, the 1st pressing roll 331, the extrusion roll 333, and the 2nd pressing roll 334 are alternately arrange | positioned with respect to the conveyance direction. Thereby, the stock to be conveyed is forcibly extended in the vertical direction, and the contained water is squeezed out. Thereafter, the stock is conveyed to the drying unit 40 as wet paper. The moisture content of the wet paper at this point is usually about 55%.

  In addition, the below-mentioned saucer 61 is provided under the dehydration part 32 and the pressing part 33, and this saucer 61 receives the white water which dehydrates and falls.

(Drying part)
The drying unit 40 includes first push rolls 411, first dryer rolls 413, second push rolls 414, second dryer rolls 415, and third push rolls 416 that are alternately arranged in the transport direction from the upstream side. And the canvas 42 is moved by rotating them synchronously. The wet paper is transported along the canvas 42 and forcedly stretched up and down to squeeze out the water it contains. The first dryer roll 413 and the second dryer roll 415 are collectively referred to as a dryer roll 41.

  Further, when the wet paper comes into contact with the surfaces of the heated first dryer roll 413 and second dryer roll 415, moisture in the wet paper evaporates. As a result, the wet paper is rapidly dried and carried out as paper P having a water content of 5 to 10%. Thereafter, the paper P is appropriately processed and then shipped as a product.

  The drying unit 40 is entirely covered with a hood (not shown), and in this state, it is difficult to observe the internal state of the drying unit 40 from the outside.

[White water recovery system]
The white water recovery system 60 recovers white water generated in the dewatering unit 32 and the pressing unit 33. As described above, the tray 61 of the white water recovery system 60 is provided below the dehydrating unit 32 and the pressing unit 33, and receives white water that is dehydrated and dropped by the dehydrating unit 32 and the pressing unit 33. The white water received by the receiving tray 61 is collected in the white water silo 63, returned to the mixing chest 23 as appropriate, and reused.

  Since such white water contains a wide variety of carbohydrates, it has an environment in which organisms such as algae, fungi, and bacteria can easily propagate. These organisms eventually form a viscous body called slime and induce various problems. However, such a problem is suppressed by the next reaction system 50.

[Reaction system]
The reaction system 50 includes an oxidizer tank 51, a nitrogen-containing compound tank 53, and a reaction tank 54 as precursor tanks. The oxidant tank 51 contains an oxidant and supplies the oxidant to the reaction tank 54 via the oxidant supply path 512. The nitrogen-containing compound tank 53 stores the nitrogen-containing compound and supplies the nitrogen-containing compound to the reaction tank 54 through the nitrogen supply path 531. The supply amount and supply ratio of these oxidant and nitrogen-containing compound can be adjusted by the opening degree of the oxidant supply valve 513 provided in the oxidant supply path 512 and the nitrogen supply valve 533 provided in the nitrogen supply path 531. . Thus, the reaction tank 54, the oxidant supply valve 513, and the nitrogen supply valve 533 constitute a reaction means.

  Although it does not specifically limit as an oxidizing agent, Halogen donors, such as sodium hypochlorite, sodium hypobromite, sodium bromite, and chlorine dioxide, hydrogen peroxide, etc. are mentioned. The nitrogen-containing compound is not particularly limited, and examples thereof include inorganic bromine compounds such as ammonium bromide, sodium bromide, potassium bromide, calcium bromide and ammonium sulfate, halides having a nitrogen atom, sulfates and nitrates. . These oxidizing agents and nitrogen-containing compounds, particularly oxidizing agents, are extremely weak against temperature changes and are easily decomposed.

Here, when sodium hypochlorite is used as the oxidizing agent and ammonium bromide is used as the nitrogen-containing compound, the reaction that occurs in the reaction vessel 54 is shown below.
NH ₄ Br + NaOCl → [NH ₂ BrCl] ⁻ H ⁺ + NaOH

The reaction product generated in this reaction _[NH 2 ^BrCl] - ^{H +} becomes Buromamin compound is that (see JP-A-5-146785) which is known to have a very high water capacity. However, since such a bromamine compound has low stability, decomposition is often started in a short time after production. For this reason, it is preferable that the bromamine compound produced and produced immediately before use is used promptly. The time from production to use may be appropriately set according to the conditions (for example, temperature) under which the bromamine compound is placed, but is usually preferably 10 minutes or less, more preferably within 1 minute, most preferably Within 10 seconds.

  The slime control agent containing the bromamine compound is supplied to the white water silo 63, the machine chest 24, and the pulp chest 21 through the supply path 55, and exhibits a water treatment function at each part to reduce slime. For this reason, it is preferable that the supply path 55 is designed so that the slime control agent reaches the white water silo 63, the machine chest 24, and the pulp chest 21 within the above time. In this embodiment, the slime control agent is supplied to the white water silo 63, the machine chest 24, and the pulp chest 21. However, the present invention is not limited to this, and the slime control agent may be supplied to any place where slime formation is a concern.

By the way, when the nitrogen atom / chlorine atom (molar ratio) in the above reaction exceeds a predetermined range (for example, 1 or less), the yield of [NH ₂ BrCl] ⁻ H ⁺ is drastically reduced and a by-product having inferior water treatment capacity is generated. There is a tendency to. Further, as described above, the oxidizing agent is particularly weak against temperature change and is easily decomposed.

  Therefore, the reaction system 50 according to the present embodiment further includes a heat medium supply source 56. The heat medium supply source 56 introduces a refrigerant as a heat medium into the flow path forming unit 52 via the heat medium supply path 563, and passes the refrigerant derived from the flow path forming part 52 via the heat medium return path 565. And collect. As described above, the heat medium supply source 56 and the heat medium supply path 563 constitute a heat medium supply means, and the heat medium supply source 56 and the heat medium reflux path 565 constitute a reflux means.

  The refrigerant is not particularly limited, and various fluids can be used, but water is preferable because it has a high specific heat and is inexpensive. Moreover, the refrigerant | coolant may contain the bactericidal component at the point which can suppress the biological generation etc. in the site | part through which a refrigerant | coolant flows.

  FIG. 2 is a perspective view showing an installation state of the flow path forming part 52 in the oxidant tank 51, and FIG. 3 is a longitudinal sectional view of the oxidant tank 51 and the flow path forming part 52 in FIG.

  As shown in FIG. 2, the flow path forming portion 52 in the present embodiment includes a hose 521 as a single hollow member having a space formed therein, and the hose 521 serves as an outer wall of the oxidant tank 51. A flow path is formed by being wound around the side wall 511. Then, the refrigerant from the heat medium supply path 563 is introduced from the introduction port 524a located at one end of the hose 521, circulates around the side wall 511 through the flow path inside the hose 521, and then to the other end of the hose 521. The lead-out port 524b positioned is led out to the heat medium reflux path 565. Thus, since the flow path of the flow path forming part 52 is substantially sealed except for the inlet 524a and the outlet 524b, contact with the outside air is suppressed.

  The hose 521 is made of a flexible material having flexibility such as rubber (for example, ethylene propylene rubber), and is provided on the side wall 511. Thereby, as shown by α in FIG. 3, since the hose 521 is bent, the contact portion 522 contacts the side wall 511 over a wide area. Further, the flexible material of this embodiment also has stretchability, and the hose 521 is provided in a state of being stretched on the side wall 511. The refrigerant flowing through the flow path of the flow path forming unit 52 exchanges heat with the oxidant 515 via the contact part 522 and the side wall 511. Thus, the oxidant tank 51 constitutes a heat exchange tank.

  The refrigerant that has been heated and exchanged with the oxidant 515 as described above is refluxed to the heat medium supply source 56 via the heat medium reflux path 565. Thereafter, the refrigerant is cooled by a cooling unit (not shown) of the heat medium supply source 56 and then introduced into the hose 521 again via the heat medium supply path 563.

  The flow path forming unit 52 and the heat medium supply source 56 described above constitute a heat exchange unit.

[Function and effect]
According to this embodiment, the following effects can be obtained.

Since the flow path is provided in the side wall 511 of the oxidant tank 51 so as to conduct heat, heat exchange is performed between the refrigerant flowing through the flow path and the oxidant accommodated in the oxidant tank 51.
Here, since the flow path is substantially sealed except for the inlet 524a and the outlet 524b, the algae spore floating in the outside air is suppressed from being mixed into the refrigerant, and algae are generated on the side wall 511 of the oxidant tank 51. Is suppressed. Thus, efficient heat exchange between the refrigerant and the oxidant is continued, so that the decomposition of the oxidant can be sufficiently suppressed and the environmental load can be reduced.

  Since the flow path is formed by providing the hose 521 on the side wall 511, even if the adhesion between the hose 521 and the side wall 511 becomes insufficient, it is difficult for the refrigerant to leak from the flow path. For this reason, since generation | occurrence | production of algae is suppressed more reliably, decomposition | disassembly of an oxidizing agent can be suppressed more reliably and an environmental load can be reduced more reliably.

  Since the hose 521 is made of a flexible material, the hose 521 bends and adheres to the side wall 511 over a wide range. Thereby, since the side wall 511 is insulated from the outside air, the decomposition efficiency of the oxidant and the reduction efficiency of the environmental load can be improved.

  Since the hose 521 made of an elastic material is provided on the side wall 511 in a stretched state, the hose 521 naturally adheres to the side wall 511 due to the contraction force of the elastic material. Moreover, since the hose 521 bends as the stretchable material contracts, the contact area between the contact portion 522 and the side wall 511 of the hose 521 increases, and heat exchange between the refrigerant and the oxidant is promoted. Thereby, the decomposition efficiency of an oxidizing agent and the reduction efficiency of an environmental load can be improved synergistically.

  The refrigerant led out from the lead-out port 524b is refluxed to the heat medium supply source 56 and is finally introduced from the introduction port 524a into the flow path. Thus, since the refrigerant is reused, the environmental load can be further reduced.

  Since the oxidizing agent is stored in the oxidizing agent tank 51, the decomposition of the oxidizing agent can be sufficiently suppressed and the environmental load can be reduced. This reduces the troublesome work of measuring the residual concentration of the oxidant every time the slime control agent is used and adjusting the opening of the oxidant supply valve 513 and the nitrogen supply valve 533 according to this concentration. The Therefore, a slime control agent excellent in water treatment efficiency can be easily generated.

Second Embodiment
FIG. 4 is a schematic configuration diagram of a flow path forming portion 52A according to the second embodiment of the present invention, and FIG. 5 is a diagram showing an installation state of the flow path forming portion 52A in the oxidant tank 51. This embodiment is different from the first embodiment in the configuration of the flow path forming part 52A.

  As shown in FIG. 4, the flow path forming part 52A has a plurality of short hoses 521A, and these hoses 521A are arranged in parallel to each other. One end of the hose 521A group is connected to the side part of the first joining member 523a, and the other end is connected to the side part of the second joining member 523b.

  A ring-shaped fixing portion 525a is fixed to the opposite side portion of the first joining member 523a, and the fixing portion 525a is engaged with and fixed to the ring-shaped fixed portion 527b. The fixed portion 527b is fixed to one end of a band-shaped engagement band 526, and a distal end C-shaped locking portion 527a is fixed to the other end of the engagement band 526. The locking portion 527a can be locked to a ring-shaped locked portion 525b fixed to the opposite side portion of the second joining member 523b. The engagement band 526 is made of a non-stretchable material and has a length adjusting mechanism (not shown). The length can be freely adjusted by the length adjusting mechanism.

  As shown in FIG. 5, the hose 521A is wound around the side wall 511, and in this state, the locking portion 527a is locked to the locked portion 525b. Then, the length of the engagement band 526 is appropriately adjusted by the length adjustment mechanism, whereby the hose 521A is provided on the side wall 511 in an extended state.

  Incidentally, unshown joining channels are formed in the first joining member 523a and the second joining member 523b, respectively. This joining channel communicates the inlet 524aA provided in the first joining member 523a and the outlet 524bA provided in the second joining member 523b with both ends of the hose 521A. For this reason, the refrigerant introduced into the combined flow path from the inlet 524aA flows through the flow path formed by each of the hoses 521A, circulates substantially around the outer periphery of the side wall 511, and then merges again to be led out from the outlet 524bA. .

  In this embodiment, the hose 521A is not wound around a part of the outer periphery of the side wall 511, but the length of the hose 521A is set in consideration of the outer periphery of the side wall 511 so that this part is as narrow as possible. It is preferable. Moreover, the installation technique of hose 521A is not specifically limited, The structure of each member, a connection structure, etc. are not specifically limited.

[Function and effect]
According to this embodiment, in addition to the operational effects of the first embodiment described above, the following operational effects are obtained.

  Since the plurality of 521A are provided and the length of each hose 521A is shortened, the refrigerant introduced from the inlet 524aA exchanges heat with the oxidant 515 only for a short time, and is quickly led out from the outlet 524bA before being warmed. And cooled again. Thereby, since the high capacity | capacitance oxidizing agent 515 can heat-exchange with a sufficiently low temperature refrigerant | coolant, decomposition | disassembly of the oxidizing agent 515 can be suppressed more fully. Further, since the refrigerant is recirculated and reused, an increase in environmental load can be suppressed to a minimum.

  Since the entire length of the path through which the refrigerant circulates is shortened, the pressure required for the circulation of the refrigerant decreases. Thereby, pressure loss can be reduced and the heat medium supply source 56 can be operated economically.

<Third Embodiment>
FIG. 6 is a schematic configuration diagram of a reaction system 50B according to the third embodiment of the present invention. This embodiment is different from the first embodiment in that a temperature difference detection unit 57 and a refrigerant adjustment unit 58 are provided.

  That is, the reaction system 50B further includes a temperature difference detection unit 57. The temperature difference detection unit 57 subtracts the temperature of the refrigerant flowing through the heating medium return path 565 from the temperature of the refrigerant flowing through the heating medium supply path 563. Is detected. This detected value is an index of the degree to which the refrigerant has been warmed by heat exchange with the oxidant 515 in the oxidant tank 51, and is transmitted to the refrigerant adjustment unit 58.

  The refrigerant adjustment unit 58 controls the cooling unit 561 of the heat medium supply source 56 based on the received detection value. That is, the refrigerant adjustment unit 58 increases or decreases the output of the cooling unit 561 according to the detected value, and thereby the refrigerant that exchanges heat with the oxidant 515 is maintained at a predetermined temperature.

  In the present embodiment, the temperature difference ΔT is a value obtained by subtracting the temperature of the refrigerant flowing through the heat medium recirculation path 565 from the temperature of the refrigerant flowing through the heat medium supply path 563, but the opposite may be possible.

[Function and effect]
According to this embodiment, in addition to the operational effects of the first embodiment described above, the following operational effects are obtained.

  Since the refrigerant adjustment unit 58 is further provided, the refrigerant that exchanges heat with the oxidant 515 is maintained at a predetermined temperature. Thereby, since the oxidizing agent 515 is always cooled to a desired temperature, the decomposition of the oxidizing agent 515 can be suppressed more reliably. Moreover, the environmental load can be further reduced by controlling the output of the cooling unit 561 to the minimum necessary.

  Since the oxidizer 515 is corrosive, when the temperature of the oxidizer 515 is continuously measured, the thermometer is consumed very much and the maintenance cost increases. However, according to the present embodiment, since the temperature difference detection unit 57 is provided outside the oxidizer tank 51 and the refrigerant adjustment unit 58 controls based on the temperature difference ΔT, the maintenance cost can be reduced and The cooling unit 561 can be continuously controlled.

<Test Example 1>
A sodium hypochlorite aqueous solution having an effective chlorine concentration of 13% was allowed to stand at 37 ° C. or 20 ° C., and the sodium hypochlorite concentration was measured after 30 days.

  As a result, the concentration decrease under the condition of 37 ° C. was about 40%, while the concentration decrease under the condition of 20 ° C. was only 10% or less. Thereby, it was confirmed that decomposition | disassembly of sodium hypochlorite can be suppressed significantly by keeping the liquid temperature of sodium hypochlorite aqueous solution low.

<Example>
The example was carried out at a paper mill in operation. The sodium hypochlorite tank installed in this factory building is a polyethylene tank with a capacity of 5000 L, no wall members are installed around the tank, and the temperature change is the outdoor outdoor temperature. It was almost equal.

An ethylene propylene rubber heat exchanger “cooling roll CRN” (Daiichi Kogyo Co., Ltd., length 5470 mm × width 900 mm, heat exchange area 4.8 m ² ) was wound around the outer periphery of the tank. Between this heat exchanger and a small air-cooled chiller “RSK-400F” (manufactured by Orion Co., Ltd.) having a cooling capacity of 1 kW, cold water at 20 ° C. is circulated at a flow rate of 20 L / min. The aqueous sodium chlorate solution was cooled.

[Evaluation 1]
This state was maintained for about 60 days, during which the temperature of the sodium hypochlorite aqueous solution was measured periodically. This result is shown in FIG. 8 together with changes in the outside air temperature.

  As shown in FIG. 8, the outside air temperature during the test period was a high temperature having an average value of about 30 ° C. and a maximum value of 33 ° C. or higher. The temperature of the hypochlorous acid proposed thorium aqueous solution before the start of cooling exceeded 30 ° C., similarly to the outside air temperature. In addition, when a new hypochlorous acid proposed thorium aqueous solution was replenished, the liquid temperature decreased for a very short period of time, but then the temperature was rapidly increased.

  On the other hand, when the cooling was started, the liquid temperature rapidly dropped immediately after that and stabilized in the range of 20 ° C to 23 ° C. Based on the result of Test Example 1 in which the decomposition of sodium hypochlorite was significantly suppressed over 20 days under the condition of 20 ° C., the decomposition of sodium hypochlorite was achieved by the apparatus and method according to this example. Is significantly suppressed.

[Evaluation 2]
Before and after cooling the tank, ammonium bromide was reacted with sodium hypochlorite released from the sodium hypochlorite tank so that the molar ratio was 1: 1 based on the concentration of the solution replenished to the tank. The pH of the produced reaction product was measured.

  Then, before the tank cooling, the pH of the reaction product obtained by the reaction immediately after replenishment of sodium hypochlorite was 9.7, but the pH of the reaction product obtained by the reaction 48 hours after replenishment. Was 9.3.

  As shown in FIG. 8, the temperature of the liquid 48 hours after replenishment before cooling the tank has already been increased, and is 27 to 28 ° C. Based on this fact, it is estimated that this pH decrease is due to a decrease in the concentration of highly alkaline sodium hypochlorite. When the pH is lowered, the bromamine compound is further destabilized and the decomposition is not only promoted, but also the amount of unreacted ammonium bromide increases, resulting in inefficiency.

  In contrast, after cooling the tank, the pH of the reaction product obtained by the reaction 7 days after the replenishment was 9.7, which was not significantly different from the pH immediately after the replenishment. As shown in FIG. 8, based on the fact that the liquid temperature after cooling the tank was stable in the range of 20 ° C. to 23 ° C., the results in this evaluation test showed that the decomposition of sodium hypochlorite was sufficiently suppressed. It is strongly suggested that it was due to what was done.

<Modification>
The present invention is not limited to the above-described embodiment, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.

  In the embodiment, the hose 521 that is a hollow member is used to form the flow path, but the present invention is not limited thereto. For example, 52C shown in FIG. 7 includes a partial annular tube 521C having a C-shaped cross section, and a cutout portion of the partial annular tube 521C is brought into close contact with the side wall 511, thereby forming a flow path. That is, in this aspect, the refrigerant flowing through the flow path comes into direct contact with the side wall 511. However, in order to suppress water leakage, the partial annular tube 521C is preferably made of a high hardness member such as metal.

  In the above-described embodiment, the hose 521 is wound around the middle of the side wall 511. However, the hose 521 is not limited to this and may be wound entirely. Moreover, in the said embodiment, although the single hose 521 is wound by the side wall 511, it is not restricted to this, You may wind several hose, The hose is not the circumferential direction but the oxidizing agent tank 51's. You may provide along an axial direction. The hose 521 may be provided on an outer wall other than the side wall 511, for example, the lower wall and the upper wall. However, the hose 521 is preferably provided on the side wall 511 or the lower wall in terms of improving heat exchange efficiency with the oxidant 515.

  In the above embodiment, the refrigerant led out from the outlet 524b is returned to the heat medium supply source 56 via the heat medium reflux path 565, but the present invention is not limited to this, and a part or all of the refrigerant may be discarded. .

  In the said embodiment, although the reaction system 50 was installed in the papermaking system 10, it is not restricted to this, It can be used for the various location where the water which requires water treatment is produced | generated. In the present embodiment, the refrigerant is used as the heat medium, but a heat medium may be used according to the object and purpose of heat exchange.

1 is a schematic configuration diagram of a paper making system including a reaction system according to a first embodiment of the present invention. It is a perspective view which shows the installation state of the hollow member to the to-be-heated exchange tank with which the reaction system which concerns on the said embodiment is equipped. It is a longitudinal cross-sectional view of the to-be-heat-exchanged tank and hollow member of FIG. It is a schematic block diagram of the hollow member which concerns on 2nd Embodiment of this invention. It is a figure which shows the installation state of the hollow member to the to-be-heat-exchanged tank which concerns on the said embodiment. It is a schematic block diagram of the reaction system which concerns on 3rd Embodiment of this invention. It is a figure which shows the structure of the flow path which concerns on one modification of this invention. It is a figure which shows the temperature change of the reaction precursor accommodated in the to-be-heated exchange tank with which the reaction system which concerns on one Example of this invention is equipped.

Explanation of symbols

50, 50B Reaction system 51 Oxidant tank (precursor tank, heat exchange tank)
511 Side wall (outer wall)
513 Oxidant supply valve (reaction means)
515 Oxidizing agent (reaction precursor)
52, 52A, 52C Flow path forming part (heat exchange means)
521, 521A Hose (hollow member)
524a, 524aA Inlet port 524b, 524bA Outlet port 53 Nitrogen-containing compound tank (precursor tank)
533 Nitrogen supply valve (reaction means)
54 Reaction tank (reaction means)
56 Heat medium supply source (heat exchange means, heat medium supply means, reflux means)
563 Heat medium supply path (heat medium supply means)
565 Heat medium reflux path (reflux means)

Claims (6)

A reaction system for reacting a plurality of reaction precursors,
A plurality of precursor vessels containing each of the reaction precursors;
Reaction means for reacting precursors from each of the precursor tanks;
Heat exchange means for exchanging heat with a reaction precursor housed in one or more heat exchange tanks selected from the plurality of precursor tanks,
The heat exchange means is provided on the outer wall of the heat exchange tank so as to be capable of conducting heat, and a flow path through which a heat medium flows;
A heating medium supply means for supplying a heating medium to the flow path,
The flow path is substantially sealed except for an introduction port connected to the heating medium supply means and introduced with a heating medium, and an outlet port where the heating medium is led out,
The flow path is formed by providing a plurality of hollow members formed in a substantially sealed space inside the outer wall except for the inlet and the outlet.
The reaction precursor includes an oxidizing agent and a nitrogen-containing compound, and at least the oxidizing agent is accommodated in the heat exchange tank,
The reaction means reacts the oxidizing agent and the nitrogen-containing compound to produce a slime control agent ,
The hollow member is a reaction system made of a flexible material having flexibility .   The reaction system according to claim 1, wherein the length of each of the hollow members is a length of one round of the outer wall. Further comprising Claim 1 or 2 reactive system according to recirculation means for recirculating the heating medium derived from the outlet to the heating medium supply means. A method of producing a reaction product by reacting a plurality of reaction precursors,
A flow path is provided on the outer wall of one or more heat exchange tanks selected from a plurality of precursor tanks containing each of the reaction precursors so as to conduct heat, and an introduction port and a heat medium are introduced. Almost sealed except for the outlet
The flow path is formed by providing a plurality of hollow members formed in a substantially sealed space inside the outer wall except for the inlet and the outlet.
The reaction precursor includes an oxidizing agent and a nitrogen-containing compound,
In the method, at least the oxidizing agent is accommodated in the heat exchange tank,
Reacting the oxidizing agent and the nitrogen-containing compound to produce a slime control agent;
Have a procedure for supplying the heating medium from the inlet of the channel,
The hollow member is made of a flexible material having flexibility,
The method is a method in which the hollow member is provided on the outer wall in a bent state . The reaction system according to claim 4 , wherein the length of each of the hollow members is a length of substantially one round of the outer wall. The method according to claim 4 or 5 , further comprising a step of refluxing the heating medium led out from the outlet and reintroducing it from the inlet.

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