WO2017222048A1 - フロー式リアクター - Google Patents
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- WO2017222048A1 WO2017222048A1 PCT/JP2017/023205 JP2017023205W WO2017222048A1 WO 2017222048 A1 WO2017222048 A1 WO 2017222048A1 JP 2017023205 W JP2017023205 W JP 2017023205W WO 2017222048 A1 WO2017222048 A1 WO 2017222048A1
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- C08L101/02—Compositions of unspecified macromolecular compounds characterised by the presence of specified groups, e.g. terminal or pendant functional groups
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- C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
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- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/22—Conductive material dispersed in non-conductive organic material the conductive material comprising metals or alloys
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- H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
- H01B1/20—Conductive material dispersed in non-conductive organic material
- H01B1/24—Conductive material dispersed in non-conductive organic material the conductive material comprising carbon-silicon compounds, carbon or silicon
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Definitions
- the present invention relates to a flow reactor, and more particularly to a flow reactor characterized in that at least a part of the inner wall of the reactor section is made of a fluororesin having a conductive filler. .
- the microflow reactor is a chemical reaction apparatus that uses a sub-millimeter flow channel as a reaction field.
- the microflow reactor has a high-speed mixing performance (for example, mixing two liquids in a micro space reduces the material diffusion distance of the two liquids, resulting in a significantly faster mass transfer due to the minute reaction field. ), And has a special effect such as heat removal performance (reaction field is small and thermal efficiency is extremely high and temperature control is easy), reaction control performance, interface control performance, etc., and has attracted attention in recent years.
- the safety of the entire process is reduced, the equipment cost is greatly reduced, the process is enhanced by incorporating it into the existing process (micro-in-macro), and the existing production system Various effects are expected, such as making it possible to manufacture substances that could not be manufactured.
- a flow reactor is a chemical reaction device that has an improved operability by increasing the channel diameter to the order of millimeters to centimeters within a range that does not impair the characteristics of the microflow reactor.
- a flow type reactor is mainly composed of a raw material feeding section, a reaction section, and an operation control section. Generally, these substrates include inorganic substances such as metals, silicon, glass, and ceramics, or organic substances such as resins. Is used.
- Patent Document 1 discloses a method of continuously producing a polymer by RAFT solution polymerization using a flow reactor, and the flow reactor is preferably made of polymer, metal, glass, or a combination thereof. It is configured.
- Patent Document 2 discloses a glass, Teflon (registered trademark), metal, which is a microchannel structure and has resistance to highly corrosive liquids such as acid and alkali. Are used for a substrate.
- Patent Document 3 in an apparatus for handling a fluid containing an easily polymerizable substance (for example, a distillation tower), the surface of a loading part loaded in the apparatus is coated with a fluororesin.
- Patent Document 4 discloses a reactor having a metal inner wall to which a fluoropolymer coating is fixed.
- Patent Document 5 discloses a structure for storing and transporting a chemical product such as a corrosive product, and the structure has an inner layer made of radiation-grafted fluoropolymer and directly bonded to the inner layer. And a multilayer structure including an outer layer of the polyolefin.
- Patent Document 6 discloses a multilayer tube that is preferably used for transportation of gasoline. The multilayer tube includes an inner layer made of radiation-grafted fluoropolymer and an outer layer of polyolefin directly adhered to the inner layer. have.
- Patent Document 7 discloses a laminated tube comprising at least three layers including a layer made of a fluorine-containing polymer.
- insulating pipes are used for low conductivity liquids ( ⁇ 50 pS / m) such as gasoline, kerosene, and toluene. Should not be used. For this reason, when an organic solvent having a low dielectric constant is used as a reaction solvent, insulating materials such as glass, plastic, and ceramic as disclosed in Patent Documents 1 and 2 cannot be used in the flow reactor.
- examples of materials that can be used for a charging substance such as the organic solvent having a low dielectric constant and are excellent in corrosion resistance include metals and alloys such as stainless steel, titanium, hastelloy, and monel. However, since these are generally heavy and hard, large-scale construction is required for assembly.
- An object of the present invention is to provide a flow reactor that can use a chargeable substance such as an organic solvent having a low dielectric constant and is excellent in corrosion resistance.
- the present inventors reduced the risk of electrostatic ignition by configuring at least a part of the inner wall of the reactor section with a fluororesin having a conductive filler.
- the present invention has been completed by finding that a flow type reactor that avoids the charging, can use a charging substance such as an organic solvent having a low dielectric constant, and has excellent corrosion resistance can be obtained.
- the flow reactor according to the present invention has the gist in the following points.
- Two or more raw material feeding sections, a mixing section that mixes the raw materials from the raw material feeding section, and a reactor section that circulates the mixed liquid adjusted in the mixing section, and at least an inner wall of the reactor section A flow reactor characterized in that a part thereof is made of a fluorine-based resin having a conductive filler.
- the flow type reactor of the present invention since at least a part of the inner wall is made of a fluororesin having a conductive filler, even a chargeable substance and a corrosive substance can be used. In addition, by using a flow reactor, the entire process becomes compact. Therefore, it is possible to minimize the amount of highly dangerous substances to be held and to increase safety, and it is possible to construct a process that is greatly reduced in equipment cost and excellent in competitiveness.
- FIG. 1 is a schematic view showing an example of a flow reactor employed in the present invention.
- FIG. 2 is a cross-sectional view showing an example of a reactor section in the flow type reactor of the present invention.
- FIG. 3 is a schematic view showing another example of a flow reactor employed in the present invention.
- FIG. 4 is a schematic view showing another example of a flow reactor employed in the present invention.
- FIG. 5 is a schematic view showing another example of a flow reactor employed in the present invention.
- FIG. 6 is a schematic diagram of an experimental apparatus used in Examples and Comparative Examples.
- FIG. 7 is a schematic explanatory diagram of the equivalent diameter De of the flow path.
- FIG. 8 is a schematic explanatory diagram of the outer equivalent diameter De ′.
- FIG. 1 is a schematic diagram showing an example of the configuration of a flow reactor employed in the present invention, and is the most basic example.
- the flow type reactor has two or more raw material feeding sections (in the illustrated example, two raw material feeding sections 1a and 1b) and a mixing section 2 for mixing the raw materials from the raw material feeding sections. (T-shaped mixer in the illustrated example) and a reactor unit 3 that circulates the mixed liquid adjusted in the mixing unit 2, and the liquid is fed through the reactor unit 3 (in the illustrated example, a linear reactor unit). The reaction proceeds while being done.
- the raw material feeding sections 1a and 1b are connected to raw material storage containers 4a and 4b for storing the respective raw materials.
- liquid feed control units 5a and 5b are installed in the raw material feed units 1a and 1b, respectively, and the liquid mixture is supplied to the reactor unit 3 by the pressure generated by these liquid feed control units 5a and 5b. Has been distributed. Further, the reaction liquid discharged from the reactor unit 3 is temporarily stored in the reaction liquid storage container 6.
- the present invention is characterized in that at least a part of the inner wall of the reactor section is made of a fluororesin having a conductive filler.
- the fluororesin has a conductive filler that avoids the risk of electrostatic ignition, enables the use of electrifying substances such as organic solvents with a low dielectric constant, and has excellent corrosion resistance. Is obtained.
- the fluororesin since the fluororesin is light and soft, it can be bent flexibly at the production site and can be attached manually, which has the advantage of greatly improving workability.
- alloys such as Hastelloy and Monel, the market price per unit length of the fluorine-based resin is significantly lower, and the replacement work can be simplified.
- the volume resistivity of the fluororesin itself is usually 1.0 ⁇ 10 16 to 1.0 ⁇ 10 18 ⁇ ⁇ m (JIS K 6911; 50% RH, 23 ° C.) and general thermoplasticity such as polypropylene. Since it is higher than the resin, the fluororesin alone tends to be easily charged. Therefore, in the present invention, the risk of electrostatic ignition is reduced by including a conductive filler in the fluororesin. In addition, by adopting a fluorine-based resin, it becomes possible to provide a process at a lower cost than when a metal having excellent corrosion resistance is used.
- the conductive filler is only required to be contained in the fluorine-based resin, and for example, it is desirable that the conductive filler is kneaded into the fluorine-based resin.
- the linear velocity of the reaction liquid flowing through the flow path tends to increase, and there is a concern that the conductive filler may fall off due to friction between the reaction liquid and the inner wall. Therefore, in order to prevent the conductive filler from falling off, the conductive filler is preferably kneaded into the fluorine-based resin.
- the fluororesin is a homopolymer or copolymer formed from a fluorine atom-containing monomer.
- the homopolymer generated from the fluorine atom-containing monomer include polytetrafluoroethylene (PTFE), polychlorotrifluoroethylene (PCTFE), polyvinylidene fluoride (PVDF), and polyvinyl fluoride (PVF).
- Copolymers produced from fluorine atom-containing monomers include perfluoroethylene propene copolymer (FEP), perfluoroalkoxyalkane (PFA), tetrafluoroethylene-perfluorodioxole copolymer (TFE / PDD), ethylene-chlorotrifluoro.
- Ethylene copolymer ECTFE
- ethylene-tetrafluoroethylene copolymer ETFE
- CPT tetrafluoroethylene-perfluoro (alkyl vinyl ether) -chlorotrifluoroethylene copolymer
- EFEP ethylene-tetrafluoroethylene-hexafluoropropene copolymer
- PTFE, PCTFE, FEP, PFA, ECTFE or ETFE is preferable, and PTFE, FEP or PFA is more preferable.
- PCTFE, PVF, FEP, PFA, ECTFE or ETFE is preferred.
- the fluororesin since the fluororesin is used for the inner wall of the reactor part, it is desirable that the fluororesin have both chemical resistance and moldability, and PFA is particularly preferable as the fluororesin.
- the inside of the reactor may become high temperature, so the higher the melting point of the fluororesin is, for example, preferably 150 ° C. or higher, more preferably 200 ° C. or higher, and further preferably 240 ° C. or higher.
- the upper limit is not particularly limited, but is usually 350 ° C. or lower.
- metal or carbon which is a conductor
- carbon such as carbon black, ketjen black, acetylene black, carbon nanotube, natural graphite, artificial graphite, vapor grown carbon fiber, etc.
- Metal fillers such as gold, silver, nickel, copper, zinc, aluminum and stainless steel; Metal oxide fillers such as aluminum-doped zinc oxide, antimony-doped tin oxide (IV) and tin-doped indium oxide (III); AgCu , AgSn, CuZn, CuNiZn, CuNi and other metal alloy fillers; and the like. These can be used individually or in mixture of 2 or more types.
- the reactor part containing a fluororesin is inferior in terms of durability compared to a metal reactor part, the frequency of replacement of the reactor part tends to be higher than when a metal reactor part is used. Therefore, the conductive filler used for the reactor part is easily available, and a carbon-based filler excellent in conductivity and chemical resistance is preferable.
- the shape of the conductive filler is not particularly limited, and the conductive filler is preferably spherical or acicular.
- the lower limit of the average particle diameter of the conductive filler is preferably 5 nm or more, more preferably 10 nm or more.
- an upper limit of the said average particle diameter 500 nm or less is preferable, More preferably, it is 100 nm or less.
- the average particle size is evaluated based on the average value of the particle size measured using a laser diffraction / scattering method, which is a general method, or a scanning electron micrograph of 100 to 1000 randomly selected fillers. it can.
- the conductive filler is preferably needle-shaped for easy formation of a conductive path, and the aspect ratio (filler length / diameter) of the needle-shaped conductive filler is set as the lower limit. , Preferably 5 or more, more preferably 10 or more.
- the upper limit of the aspect ratio is preferably 500 or less, and more preferably 100 or less.
- the content of the conductive filler is preferably 5 parts by weight or more, more preferably 7 parts by weight or more, in 100% by weight of the fluororesin.
- the upper limit of the content of the conductive filler is preferably 30 parts by weight or less, and more preferably 20 parts by weight or less.
- the fluororesin having a conductive filler has excellent antistatic properties, and its volume resistivity (JIS K 6911; 50% RH, 23 ° C.) is preferably 10 6 ⁇ ⁇ m or less, more preferably 10 5 ⁇ . M or less, more preferably 10 4 ⁇ ⁇ m or less.
- the lower limit of the volume resistivity of the fluororesin having a conductive filler is not particularly limited, but is usually 0 ⁇ ⁇ m or more.
- the surface resistivity (JIS K 6911; 50% RH, 23 ° C.) of the fluororesin having a conductive filler is preferably 10 6 ⁇ or less, more preferably 10 5 ⁇ or less.
- the lower limit is not particularly limited, but is usually 0 ⁇ or more.
- the fact that at least a part of the inner wall is made of a fluororesin having a conductive filler means that the fluororesin having a conductive filler is in contact with the content liquid contained in the reactor part. It is present on at least a part of the inner wall surface.
- FIGS. 2A to 2D show a preferred embodiment in which at least a part of the inner wall is made of a fluororesin having a conductive filler. 2 (a) to 2 (d), in particular, an example of the cross section of the reactor section when the reactor section has a circular tubular section will be described, but the cross sectional shape of the reactor section is not limited to these.
- the inner wall of the reactor part is, for example, an embodiment in which the entire inner wall of the reactor part as shown in FIGS. 2 (a) and 2 (b) is made of a fluororesin 70 having a conductive filler, or FIG. 2 (c) and A mode in which a part of the inner wall of the reactor portion as shown in FIG. 2 (d) is made of a fluororesin 70 having a conductive filler and the remaining part of the inner wall is made of a second resin 71.
- the joint between the fluororesin 70 having a conductive filler and the second resin 71 is small from the viewpoint of preventing the material contained in the reactor from falling off or preventing liquid leakage. Therefore, it is more preferable that the inner wall of the reactor part is formed of a fluororesin 70 having a conductive filler on the entire inner wall of the reactor part (FIGS. 2A and 2B).
- the reactor part may be composed of a fluororesin 70 having conductivity as shown in FIG. 2 (a), and the fluororesin 70 having conductivity as shown in FIGS. 2 (b) to (d). It may be composed of a resin 70 and a second resin 71.
- the second resin 71 may cover the outer peripheral surface of the reactor part (FIGS. 2B to 2D), or may constitute a part of the inner wall of the reactor part (FIG. 2C ), FIG. 2 (d)).
- the second resin 71 covers the outer peripheral surface of the reactor unit, it is necessary to ground the device in the middle of the channel or at an appropriate location such as a connection part in order to release the static electricity generated on the inner wall of the channel to the outside. is there.
- a part of the outer periphery of the reactor unit is covered with a conductive fluororesin 70, or the reactor unit has a conductive fluororesin 70 or a metal mixing unit and / or It is preferable to discharge static electricity to the outside by connecting a metal discharge portion and grounding the mixing portion and / or the discharge portion.
- the fluororesin 70 and the second resin 71 Since there are many joints with the resin 71, contents such as reaction raw materials and products contained in the reactor section may leak out of the reactor section through the joint. Therefore, in order to further improve the safety of the reactor part, it is effective to coat the outer peripheral surface of the reactor part with the second resin 71 as shown in FIGS.
- the second resin (however, excluding the fluorine resin having a conductive filler), for example, a fluorine resin not containing a conductive filler is preferable, and the fluorine resin is the same as described above. Can be used.
- a fluorine-based resin as the second resin, a reactor portion having excellent chemical resistance is obtained.
- the fluororesin having a conductive filler is exposed in 50% or more of the inner wall surface, more preferably 70% or more, and still more preferably. Is 90% or more, particularly preferably 100%.
- the reactor part may have a cross-sectional single-layer structure made of a fluorine-based resin having a conductive filler (FIG. 2A) or a cross-sectional multilayer structure made of a fluorine-based resin having a conductive filler ( 2 (b) to (d)), from the viewpoint of improving the antistatic effect, it is desirable that the reactor portion has a cross-sectional single layer structure made of a fluororesin having a conductive filler.
- the shape of the reactor part is not particularly limited as long as the reaction liquid can flow therethrough, and is a hollow and cylindrical tubular reactor, or a laminated type having a substrate in which grooves corresponding to flow paths are formed by etching or the like A reactor etc. can be illustrated.
- the flow path cross section may be any one of a circle, a polygon, and a distorted circle (for example, convex or concave), and more preferably a circle or a polygon.
- the tubular reactor may be a single tube or a multiple tube in which an inner tube is inserted into an outer tube, such as a double circular tube.
- the reactor part preferably has a length of 1 cm or more, more preferably 10 cm or more.
- the upper limit of the length of the reactor part is not particularly limited, but is preferably 500 m or less, more preferably 300 m or less.
- the length of the tube with respect to the equivalent diameter of the flow path is preferably 2 times or more, more preferably 10 times or more, still more preferably 15 times or more, and the upper limit is not particularly limited, It is 10,000 times or less, More preferably, it is 5000 times or less, More preferably, it is 3000 times or less.
- the equivalent diameter of the flow path in the reactor section is preferably 50 mm or less, more preferably 20 mm or less, and even more preferably 15 mm or less, preferably 0.1 mm or more, more preferably 1. It is 0 mm or more, more preferably 1.5 mm or more.
- the number of channels in the reactor section is not particularly limited, and the number of channels is one or two or more (preferably ten or less).
- the reactor section may have a structure in which two or more (preferably two) flow paths merge into one from the upstream to the downstream.
- One channel may have a structure that branches into two or more (preferably two).
- Two or more channels are more preferably installed in a tournament type.
- the inner wall of the reactor part does not necessarily need to be made of a conductive fluororesin in all the flow paths.
- the product may become conductive or lose corrosiveness as a result of the reaction, depending on the nature of the liquid after the reaction.
- the inner wall of the reactor part may be made of a material other than conductive fluororesin.
- the inner wall of the reactor section is preferably made of an inorganic material such as metal, silicon, glass, or ceramics, or an organic material such as resin, depending on the characteristics of the product.
- the equivalent diameter of the flow path of the reactor unit may be uniform throughout the reactor unit or may be changed in the middle of the reactor unit. If the equivalent diameter of the flow path in the reactor section is uniform, the reaction proceeds uniformly without hindering the flow of the reaction solution. On the other hand, considering various conditions such as mixing performance and heat removal performance, the equivalent diameter of the flow path of the reactor section may be changed in the middle of the reactor section.
- the change part of the equivalent diameter of the flow path may be arbitrary, and the number of changes of the equivalent diameter of the flow path is not limited, and may be changed once or a plurality of times as necessary. Further, the equivalent diameter of the flow path may be gradually changed, or may be greatly changed at a certain point.
- the equivalent diameter of the flow path may be thinner or thicker than the equivalent diameter of the upstream flow path, and may be appropriately designed according to the reaction.
- the design of the flow path is not limited to the following example, but for example, as the equivalent diameter of the flow path of the reactor section becomes smaller, the mixing performance improves, so the equivalent diameter of the flow path of the reactor section immediately after the mixing section is It is also possible to make it thinner and increase the equivalent diameter of the flow path in the reactor section after it has been sufficiently mixed.
- the tube thickness of the reactor part may be uniform throughout the reactor part, or may be changed in the middle of the reactor part. If the thickness of the reactor tube is reduced, the heat can escape easily and the heat removal performance is improved. Further, if the tube thickness of the reactor section is thin, the cooling effect is enhanced.
- the outer diameter of the reactor part may be uniform throughout the reactor part, or may be changed in the middle of the reactor part. Since the heat removal performance is improved as the outer diameter of the reactor section becomes thinner, for example, in a place where precise temperature control is necessary, both the equivalent diameter of the flow path of the reactor section and the outer diameter of the reactor section may be reduced. Good. Further, only the equivalent diameter of the flow path is made thick and the outer diameter of the reactor part is made uniform, so that the tube thickness of the reactor part can be made thin so that heat can escape easily.
- the outer diameter of the reactor portion refers to the equivalent diameter outside the tubular reactor.
- the ratio (D max / D min ) of the maximum equivalent diameter (D max ) to the minimum equivalent diameter (D min ) in the reactor section Is preferably 1.10 times or less, more preferably 1.05 times or less, still more preferably 1.01 times or less, and preferably 1.0 times or more.
- the ratio (D max / D min ) of the maximum equivalent diameter (D max ) to the minimum equivalent diameter (D min ) is preferably 1 More than 10 times, more preferably 1.20 times or more, still more preferably 1.30 times or more, and the upper limit of the ratio is preferably 10 times or less, more preferably 5 times or less. Note that, when the equivalent diameter of the flow path in the reactor section is reduced, the pressure loss increases, so that it is necessary to increase the apparatus strength. For this reason, it is desirable to make the equivalent diameter of the flow path of the reactor section as large as possible except for the necessary part so that the safety and cost loads are not excessive.
- the reactor unit 3 is preferably linear (line-shaped), it does not necessarily have to be linear as shown in FIG. 1.
- the reactor unit 3 is wound in a spiral shape or a coil shape as shown in FIG. 3.
- the reactor unit 31 may be used, or the reactor unit 32 bent a plurality of times as shown in FIG. 4 may be used.
- the reactor part 3 preferably has a shape in which the curvature of the reactor part does not change, such as a linear shape, a spiral shape, and a coil shape. By making the reactor part into a shape that does not change the curvature, non-uniform flow can be prevented.
- the axial direction of the spiral or coil is not particularly limited, but may be parallel to the gravitational direction or perpendicular to the gravitational direction, but more preferably parallel to the gravitational direction.
- the reactor section has a reactor inlet for introducing reaction raw materials into the reactor section and a reactor outlet for discharging products generated in the reactor section to the outside of the reactor section.
- the installation position of the reactor inlet and the reactor outlet is not particularly limited, and the reactor inlet is installed at the same height as the reactor outlet, a position higher than the reactor outlet, or a position lower than the reactor outlet. It may be.
- the reaction liquid containing a low dielectric constant solvent can contact the inner wall of the reactor section as much as possible. desirable. Therefore, it is desirable that the reactor inlet is installed at a position lower than the reactor outlet.
- the reactor inlet is installed at a position lower than the reactor outlet, the bubbles contained in the reaction liquid are discharged from the upper part of the reactor part along with the flow of the reaction liquid, so that it is difficult for the bubbles to adhere to the inner wall of the reactor part. As a result, the reaction solution and the inner wall of the reactor can be efficiently contacted.
- the fluorine-based resin tends to have a lower hermetic content than the other flexible resins, and even if the reactor part has a cross-sectional single-layer structure made of a fluorine-based resin having a conductive filler, There is also a concern that the content liquid oozes out through the fluororesin.
- reaction solution for example, acrylonitrile, acrolein, sulfurous acid gas, arsine, ammonia, carbon monoxide, chlorine, chloromethine, chlorobrene, arsenic pentafluoride, phosphorus pentafluoride, ethylene oxide, nitrogen trifluoride, Boron trifluoride, phosphorus trifluoride, hydrogen cyanide, diethylamine, disilane, sulfur tetrafluoride, silicon tetrafluoride, diborane, hydrogen selenide, trimethylamine, carbon disulfide, fluorine, bromomethyl, phosgene, phosphine, monogermane, monosilane
- a toxic substance such as monomethylamine or hydrogen sulfide
- the outer wall surface of the reactor part may be brought into contact with the quenching agent. If a quenching agent is used, safety can be ensured even if the reaction solution oozes out.
- water As a quenching agent, water; acidic aqueous solution containing at least one acid selected from hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, citric acid, etc .; at least one selected from sodium hydroxide, potassium carbonate, sodium bicarbonate
- acidic aqueous solution containing at least one acid selected from hydrochloric acid, sulfuric acid, phosphoric acid, acetic acid, citric acid, etc .
- sodium hydroxide, potassium carbonate, sodium bicarbonate Examples include alkaline aqueous solutions containing the above bases; oxidizing aqueous solutions such as aqueous hydrogen peroxide, aqueous sodium hypochlorite, and aqueous sodium chlorite; reducing aqueous solutions such as aqueous sodium thiosulfate and aqueous sodium sulfite;
- the flow reactor employed in the present invention may be provided with two or more (for example, three) raw material feeding sections depending on the reaction system, and the raw materials supplied from one or both of the raw material feeding sections are shown in FIG. As shown in FIG. 5, it may be a result obtained by mixing other raw materials 14a and 14b in advance in the premixer 12, and then reacting them if necessary.
- the reaction liquid discharged from the reactor unit 3 may be used as a raw material for the next flow reactor.
- the reaction raw material (including the pre-reacted material) is supplied into the flow reactor through these raw material feeding sections.
- the reaction raw material is usually supplied in the form of a liquid (including a solution).
- the reaction raw material is desirably supplied by a liquid feed control unit such as a diaphragm pump.
- the number of liquid feeding control units is not particularly limited, and may be the same as or more than the number of raw material feeding units.
- the liquid feeding control unit is not limited to a pump, and, for example, a pressure-feeding reaction material charging container can be used.
- the raw material feeding section is preferably a tube, and the inner diameter of the tube is preferably 0.01 mm or more, more preferably 0.1 mm or more, and preferably 50 mm or less.
- One end of the raw material feeding section is connected to the raw material supply port, and the other end is connected to the mixing section.
- the mixing unit is a unit for mixing raw materials, and the mixing unit is installed, for example, between the ends of two or more raw material feeding units and the reactor inlet.
- the liquid mixture obtained in the mixing section is supplied as a reaction liquid into the reactor section through the reactor inlet.
- the mixing part is preferably a tube, and the inner diameter of the tube is preferably 0.01 mm or more and 50 mm or less.
- the mixing unit may be equipped with a known mixer in order to sufficiently stir the raw materials.
- the mixer include a T-shaped mixer, a Y-shaped mixer, a static mixer, and a helix-type mixer. Etc.
- a discharge unit is connected to the reactor outlet.
- a discharge part is a part which distribute
- the discharge part is also preferably a tube, and the inner diameter of the tube is preferably 0.01 mm or more, more preferably 0.1 mm or more, and preferably 50 mm or less. It is desirable that the reaction liquid recovered from the discharge part is appropriately processed thereafter.
- the raw material feed section, mixing section and discharge section are made of metals such as stainless steel, hastelloy, titanium, copper, nickel and aluminum; inorganic materials such as glass and ceramics; resins such as PEEK resins, silicone resins and fluororesins; It is preferable to be configured, and conductivity may be imparted to the resin. From the viewpoints of corrosion resistance, heat resistance and durability, metals, particularly Hastelloy, are preferred.
- the raw material feeding part, mixing part and discharging part may have either a single layer structure or a multilayer structure, but from the viewpoint of preventing liquid leakage, part or all of the raw material feeding part, mixing part and discharging part are A multilayer structure is desirable. Since the shape of the mixing part may sometimes be complicated, it is better to use a metal or resin with good workability when precise processing is required.
- the temperature adjusting unit is preferably capable of adjusting at least one temperature of the raw material feeding unit, the mixing unit, and the reactor unit.
- at least one of the raw material feeding unit, the mixing unit, and the reactor unit can be temperature-controlled.
- the flow reactor of the present invention can be used for, for example, a chemical reaction operation, an extraction operation, a separation operation, a purification operation, and the like, which are examples of a fluid chemical reaction operation.
- reaction solvent examples include aliphatic hydrocarbon solvents such as n-hexane, cyclohexane, and methylcyclohexane; aromatic hydrocarbon solvents such as benzene, toluene, and xylene; diethyl ether Ether solvents such as diisopropyl ether, tetrahydrofuran, 2-methyltetrahydrofuran, 4-methyltetrahydropyran, methyl-tert-butyl ether, 1,4-dioxane, cyclopentylmethyl ether; methylene chloride, chloroform, 1,1,1,- Halogen solvents such as trichloroethane and chlorobenzene; ester solvents such as ethyl acetate, propyl acetate and butyl acetate; ketone solvents such as acetone, methyl ethyl ketone and methyl isobutyl ket
- reaction in the flow reactor is highly closed, for example, acrylonitrile, acrolein, sulfurous acid gas, arsine, ammonia, carbon monoxide, chlorine, chloromethine, chlorobrene, arsenic pentafluoride, phosphorus pentafluoride, ethylene oxide, trifluoride.
- the present invention is also applicable to reactions using toxic substances such as germane, monosilane, monomethylamine, and hydrogen sulfide.
- the temperature in the reactor during the reaction is not particularly limited as long as it is not higher than the boiling point of the reaction solvent and not lower than the freezing point, and is preferably ⁇ 80 ° C. or higher, more preferably ⁇ 60 ° C. or higher, and further preferably ⁇ 40 ° C. or higher. Preferably it is 200 degrees C or less, More preferably, it is 180 degrees C or less, More preferably, it is 160 degrees C or less.
- the flow rate of the reaction solution in the reactor section is preferably 2 m / s or less, more preferably 1 m / s or less, and even more preferably 0.8 m / s or less in order to suppress friction and prevent charging.
- the reaction time (residence time) is preferably 60 minutes or less, more preferably 30 minutes or less, and even more preferably 15 minutes or less.
- FIG. 6 shows a schematic diagram of the experimental apparatus.
- a single-layer cross-sectional flow path made of PFA having a carbon-based conductive filler (hereinafter referred to as “conductive Teflon tube”; volume resistivity: 3.0 ⁇ ⁇ m; inner diameter 2.0 mm ⁇ outer diameter 3.0 mm ⁇ length 2.6 m) 41 was wound into a coil shape with a diameter of 80 mm, and one end was connected to a tap.
- a ground was attached to a position 3 cm inside from the discharge port of the conductive Teflon tube 41.
- a 2 L disposable cup 42 made of highly insulating polypropylene was placed near the discharge port of the conductive Teflon tube 41.
- Water was fed into the conductive Teflon tube 41 at a flow rate shown in Table 1, and water flowing out from the conductive Teflon tube 41 was stored in the disposable cup 42.
- the amount of water in the disposable cup 42 reached the liquid feeding amount shown in Table 1, the water was stopped, and the surface potential of the water stored in the disposable cup 42 was measured by a surface potential measuring device.
- the results are shown in Table 1. The measurement was performed three times, and the average value was evaluated. As shown in Table 1, it was found that the use of a conductive Teflon tube can prevent the water from being charged due to liquid feeding. This result is similarly reproduced by the antistatic effect of the conductive Teflon tube even when the conductive Teflon tube is used as the reactor part of the flow type reactor.
- the conductive Teflon tube 41 is referred to as a flow path having a single-layer structure made of only PFA (hereinafter referred to as “a Teflon tube having no conductivity”; volume resistivity> 10 16 ⁇ ⁇ m; inner diameter 2.0 mm ⁇
- a Teflon tube having no conductivity The surface potential of the water stored in the disposable cup 42 was measured by a surface potential measuring device in the same manner as in Example 1 except that the outer diameter was changed to 3.0 mm ⁇ length 2.6 m). The results are shown in Table 1. The measurement was performed three times, and the average value was evaluated. As shown in Table 1, it was found that the Teflon tube having no conductivity cannot prevent the water from being charged due to the liquid feeding.
Abstract
Description
[1]2以上の原料送液部と、この原料送液部からの原料を混合する混合部と、混合部で調整された混合液を流通するリアクター部を備え、前記リアクター部の内壁の少なくとも一部が導電性フィラーを有するフッ素系樹脂で構成されていることを特徴とするフロー式リアクター。
[2]前記リアクター部が、導電性フィラーを有するフッ素系樹脂からなる断面単層構造である[1]に記載のフロー式リアクター。
[3]前記リアクター部の外壁表面に、反応液のクエンチ剤が接触している[1]または[2]に記載のフロー式リアクター。
[4]前記フッ素系樹脂は、フッ素原子含有モノマーから生成するホモポリマーまたはコポリマーである[1]~[3]のいずれかに記載のフロー式リアクター。
[5]前記導電性フィラーが、カーボン系フィラー、金属系フィラー、金属酸化物系フィラーおよび金属合金系フィラーから選ばれる少なくとも1種以上である[1]~[4]のいずれかに記載のフロー式リアクター。
[6]JIS K 6911に基づいて、50%RHおよび23℃の条件下で測定される導電性フィラーを有するフッ素系樹脂の体積抵抗率が、106Ω・m以下である[1]~[5]のいずれかに記載のフロー式リアクター。
[7]前記リアクター部の流路の相当直径は、0.1mm以上50mm以下である[1]~[6]のいずれかに記載のフロー式リアクター。
[8]温度調節部を備える[1]~[7]のいずれかに記載のフロー式リアクター。
図1は、本発明で採用するフロー式リアクターの構成の一例を示す概略図であり、最も基本的な一例である。この基本例の様に、フロー式リアクターは、2以上の原料送液部(図示例では、2つの原料送液部1a、1b)と、この原料送液部からの原料を混合する混合部2(図示例では、T字型ミキサー)と、混合部2で調整された混合液を流通するリアクター部3を備えており、リアクター部3(図示例では、直線状リアクター部)を液が送液される間に反応が進行する。
なお図1の例では、前記原料送液部1a、1bは、それぞれの原料を蓄える原料貯蔵容器4a、4bに接続している。そして、原料送液部1a、1bには、それぞれ送液制御部(好ましくはダイヤフラムポンプ)5a、5bが設置され、混合液は、これら送液制御部5a、5bによって生じた圧力によってリアクター部3を流通するようになっている。またリアクター部3から排出される反応液は、反応液貯蔵容器6に一旦蓄えられるようになっている。
以上の様な本発明で採用し得るフロー式リアクターにおいて、本発明では、リアクター部の内壁の少なくとも一部が導電性フィラーを有するフッ素系樹脂で構成されている点に特徴を有する。フッ素系樹脂が導電性フィラーを有していることにより、静電着火のリスクを回避し、低誘電率の有機溶媒のような帯電性物質の使用も可能となり、耐食性にも優れたフロー式リアクターが得られる。またフッ素系樹脂は軽くて柔らかいため、生産現場で作業員がフレキシブルに折り曲げ加工をしたり、手作業による取り付けも可能となり、作業性が大幅に改善されるといった利点もある。更には、ハステロイやモネルなどの合金に比較すると、フッ素系樹脂の単位長さ当たりの市場価格は大幅に安く、交換作業も簡便となるといった利点も挙げられる。
耐薬品性の観点からは、PTFE、PCTFE、FEP、PFA、ECTFEまたはETFEが好ましく、より好ましくはPTFE、FEPまたはPFAである。
また成形性の観点からは、PCTFE、PVF、FEP、PFA、ECTFEまたはETFEが好ましい。
本発明では、フッ素系樹脂をリアクター部の内壁に使用するため、フッ素系樹脂は耐薬品性と成形性の両方を兼ね備えていることが望ましく、フッ素系樹脂としては、特にPFAが好ましい。
また、より高い導電効果を発揮させるには、導電性フィラーは導電パスの形成が容易な針状が好ましく、針状の導電性フィラーのアスペクト比(フィラーの長さ/直径)は、下限としては、好ましくは5以上であり、より好ましくは10以上である。前記アスペクト比の上限としては、好ましくは500以下であり、より好ましくは100以下である。
なお本発明において「流路の相当直径」とは、流路の断面と等価とみなした円管に相当する直径のことを指す。すなわち、流路の相当直径Deは、下記式(i)で表される。
De=4Af/Wp …(i)
(式中、Af:流路断面積、Wp:濡れ縁長さ(断面にある壁面の長さ)である;図7参照)
De’=4Af’/Wp’ …(ii)
(式中、Af’:管状型リアクターの断面積、Wp’:管状型リアクターの外周である;図8参照)
また、前記リアクター部の管厚みとは、菅状型リアクターの流路を構成する導電性を有するフッ素系樹脂および又は他の材質の厚みのことを指す。
なおリアクター部の流路の相当直径を細くする場合には、圧力損失が高まるために装置強度を上げる必要が生じる。そのため、安全面やコスト面での負荷が過大にならないよう、必要箇所以外ではリアクター部の流路の相当直径は可能な限り太くしておくことが望ましい。
本発明で採用するフロー式リアクターは、反応の方式によって2以上(例えば、3つ)の原料送液部を備えていてもよく、片方又は両方の原料送液部から供給される原料は、図5に示すように、前もって別の原料14a、14bを予備混合器12で混合させ、必要に応じてその後反応させた結果物であってもよい。また図示しないが、リアクター部3から排出される反応液は、次のフロー式リアクターの原料として用いてよい。反応原料(予備反応物を含む)は、これら原料送液部を通じてフロー式リアクター内に供給される。反応原料は、通常、液体(溶液を含む)の形態で供給される。
混合部とは原料を混合する部であり、混合部は、例えば、2以上の原料送液部の末端とリアクター入口の間に設置される。混合部で得られた混合液は、リアクター入口を通じて、リアクター部内に反応液として供給される。混合部は好ましくは管であり、前記管の内径は、好ましくは0.01mm以上、50mm以下である。
リアクター出口には、排出部が接続していることが望ましい。排出部とは、リアクター部内で生成した生成物や未反応原料を流通する部である。排出部も好ましくは管であり、前記管の内径は、好ましくは0.01mm以上、より好ましくは0.1mm以上であり、好ましくは50mm以下である。排出部より回収される反応液は、その後、適切に処理されることが望ましい。
混合部の形状は時に複雑になることがあるため、精密な加工が必要なときには、加工性のよい金属や樹脂を用いるとよい。
フロー式リアクターはバッチ式に比べて比表面積が大きく伝熱性能が良いため、迅速に温度を調節することができる。そのためフロー式リアクターには、温度調節部が備えられていることが望ましい。温度調節部は、原料送液部、混合部およびリアクター部の少なくとも1以上の温度を調整できるものが好ましく、例えば、原料送液部、混合部およびリアクター部の少なくとも1以上を温度調節の可能な熱媒の中に沈める態様;原料送液部、混合部およびリアクター部の少なくとも1以上を多層構造にして(例えば、二層管など)、層の内側、外側、またはその両方から温度調節する態様;などが挙げられる。温度調節部の存在により、熱により反応を開始させる系や、温度を下げて副生成物の生成を抑制させる系等において、反応収率や品質を向上させることができる。
本発明のフロー式リアクターは、例えば、流体の化学反応操作の一例である、化学反応操作、抽出操作、分離操作、精製操作などに使用できる。
リアクター部における反応液の流速は、摩擦を抑えて帯電を防止するために、好ましくは2m/s以下、より好ましくは1m/s以下、更に好ましくは0.8m/s以下である。
また反応時間(滞留時間)は、好ましくは60分以下、より好ましくは30分以下、更に好ましくは15分以下である。
図6に実験装置の概略図を示す。カーボン系導電性フィラーを有するPFAからなる断面単層構造の流路(以下、「導電性テフロンチューブ」と称する;体積抵抗率3.0Ω・m;内径2.0mm×外径3.0mm×長さ2.6m)41を、直径80mmのコイル形状に巻き、一端を水道の蛇口に連結した。前記チューブ41表面を伝わった静電気を外部へ逃がす目的で、前記導電性テフロンチューブ41の排出口から3cm内側の位置にアースを取り付けた。また前記導電性テフロンチューブ41の排出口付近には、高絶縁性のポリプロピレンからなる2Lのディスポカップ42を置いた。
前記導電性テフロンチューブ41内部に表1に示す流量で水を送液し、前記導電性テフロンチューブ41から流出する水を前記ディスポカップ42に貯めた。前記ディスポカップ42内の水の量が表1に示す送液量に達した時点で水を止め、表面電位測定器により、前記ディスポカップ42内に貯まった水の表面電位を測定した。結果を表1に示す。なお測定は3回行い、その平均値により評価した。
表1に示すように、導電性テフロンチューブを使用することにより、送液による水の帯電を防止できることが分かった。本結果は、フロー式リアクターのリアクター部として導電性テフロンチューブを用いた場合でも、該導電性テフロンチューブが有する帯電防止効果により、同様に再現されるものである。
導電性テフロンチューブ41を、PFAのみからなる断面単層構造の流路(以下、「導電性を有さないテフロンチューブ」と称する;体積抵抗率は>1016Ω・m;内径2.0mm×外径3.0mm×長さ2.6m)に代えたこと以外は、実施例1と同様にして、表面電位測定器により、ディスポカップ42内に貯まった水の表面電位を測定した。結果を表1に示す。なお測定は3回行い、その平均値により評価した。
表1に示すように、導電性を有さないテフロンチューブでは、送液による水の帯電を防止できないことが分かった。
2 混合部
3 リアクター部
4a、4b、14a、14b 原料貯蔵容器
5a、5b、15a、15b 送液制御部
6 反応液貯蔵容器
12 予備混合器
31 螺旋状乃至コイル状に巻かれたリアクター部
32 複数回曲げ返されたリアクター部
41 導電性テフロンチューブまたは導電性を有さないテフロンチューブ
42 ディスポカップ
70 導電性フィラーを有するフッ素系樹脂
71 第2の樹脂(但し、導電性フィラーを有するフッ素系樹脂を除く)
Claims (8)
- 2以上の原料送液部と、この原料送液部からの原料を混合する混合部と、混合部で調整された混合液を流通するリアクター部を備え、前記リアクター部の内壁の少なくとも一部が導電性フィラーを有するフッ素系樹脂で構成されていることを特徴とするフロー式リアクター。
- 前記リアクター部が、導電性フィラーを有するフッ素系樹脂からなる断面単層構造である請求項1に記載のフロー式リアクター。
- 前記リアクター部の外壁表面に、反応液のクエンチ剤が接触している請求項1または2に記載のフロー式リアクター。
- 前記フッ素系樹脂は、フッ素原子含有モノマーから生成するホモポリマーまたはコポリマーである請求項1~3のいずれか1項に記載のフロー式リアクター。
- 前記導電性フィラーが、カーボン系フィラー、金属系フィラー、金属酸化物系フィラーおよび金属合金系フィラーから選ばれる少なくとも1種以上である請求項1~4のいずれか1項に記載のフロー式リアクター。
- JIS K 6911に基づいて、50%RHおよび23℃の条件下で測定される導電性フィラーを有するフッ素系樹脂の体積抵抗率が、106Ω・m以下である請求項1~5のいずれか1項に記載のフロー式リアクター。
- 前記リアクター部の流路の相当直径は、0.1mm以上50mm以下である請求項1~6のいずれか1項に記載のフロー式リアクター。
- 温度調節部を備える請求項1~7のいずれか1項に記載のフロー式リアクター。
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SG11201811429XA SG11201811429XA (en) | 2016-06-24 | 2017-06-23 | Flow reactor |
JP2018524181A JP7058216B2 (ja) | 2016-06-24 | 2017-06-23 | フロー式リアクター |
EP17815513.1A EP3476473A4 (en) | 2016-06-24 | 2017-06-23 | FLOW REACTOR |
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EP3476868A4 (en) * | 2016-06-23 | 2020-02-19 | China Petroleum&Chemical Corporation | CATALYST PRECONTACT DEVICE AND METHOD FOR CONTINUOUS POLYMERIZATION OF OLEFIN |
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CA3164365A1 (en) * | 2019-12-19 | 2021-06-24 | Commonwealth Scientific And Industrial Research Organisation | Preparation of halogenated alkoxyethane |
CN113791122B (zh) * | 2021-09-16 | 2023-08-25 | 国网江苏省电力有限公司建设分公司 | 一种杆塔桩基接地泄流包填料电阻率测量装置及测量方法 |
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Also Published As
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US20190126230A1 (en) | 2019-05-02 |
SG11201811429XA (en) | 2019-01-30 |
EP3476473A4 (en) | 2019-12-18 |
CN109328107A (zh) | 2019-02-12 |
JPWO2017222048A1 (ja) | 2019-04-11 |
EP3476473A1 (en) | 2019-05-01 |
KR20190022666A (ko) | 2019-03-06 |
JP7058216B2 (ja) | 2022-04-21 |
US10543474B2 (en) | 2020-01-28 |
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