WO2010125897A1 - Membrane de séparation pour la concentration de l'acide sulfurique, procédé de concentration de l'acide sulfurique et appareil de concentration de l'acide sulfurique - Google Patents

Membrane de séparation pour la concentration de l'acide sulfurique, procédé de concentration de l'acide sulfurique et appareil de concentration de l'acide sulfurique Download PDF

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WO2010125897A1
WO2010125897A1 PCT/JP2010/056433 JP2010056433W WO2010125897A1 WO 2010125897 A1 WO2010125897 A1 WO 2010125897A1 JP 2010056433 W JP2010056433 W JP 2010056433W WO 2010125897 A1 WO2010125897 A1 WO 2010125897A1
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sulfuric acid
membrane
separation membrane
liquid mixture
concentration
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PCT/JP2010/056433
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English (en)
Japanese (ja)
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応明 河合
清 新木
憲次 鈴木
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日本碍子株式会社
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/36—Pervaporation; Membrane distillation; Liquid permeation
    • B01D61/362—Pervaporation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • B01D71/028—Molecular sieves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
    • B01D71/02—Inorganic material
    • B01D71/028—Molecular sieves
    • B01D71/0281—Zeolites
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B17/00—Sulfur; Compounds thereof
    • C01B17/69—Sulfur trioxide; Sulfuric acid
    • C01B17/88—Concentration of sulfuric acid

Definitions

  • the present invention relates to a separation membrane for sulfuric acid concentration capable of concentrating sulfuric acid by permeating water in a vapor state from a liquid mixture containing sulfuric acid and water, and a sulfuric acid concentration method and a sulfuric acid concentration device using such a separation membrane.
  • a separation membrane for sulfuric acid concentration capable of concentrating sulfuric acid by permeating water in a vapor state from a liquid mixture containing sulfuric acid and water
  • a sulfuric acid concentration method and a sulfuric acid concentration device using such a separation membrane is about.
  • Purified sulfuric acid is used for acid treatment of foods and pharmaceutical intermediates because of its low impurity content.
  • semiconductor manufacturing plants and the like use a technology that uses purified sulfuric acid with high reuse value for cleaning processing and the like, and recovers and reuses waste liquid after use.
  • a sulfuric acid recovery and purification apparatus is introduced, recovery, purification, and supply can be performed consistently in the factory, and therefore reduction of industrial waste can be expected.
  • a distillation apparatus as disclosed in Patent Documents 1 and 2 is generally known as such a sulfuric acid recovery and purification apparatus.
  • Non-Patent Document 1 in the distillation method, a multi-effect evaporation method using steam as a heating source is known as a method of suppressing the heating temperature by using reduced pressure and improving the thermal economy. It has been.
  • additional equipment for heat supply or heat insulation is required, resulting in high costs.
  • Non-Patent Document 2 reports that hydrochloric acid can be dehydrated and concentrated by a sulfonated polyethylene ion exchange membrane that is a polymer membrane. If such membrane separation process enables dehydration and concentration of sulfuric acid, However, it is easy to change the design according to fluctuations in the amount of sulfuric acid waste, and it is possible to develop a low-cost sulfuric acid concentration system. However, the polymer membrane (organic membrane) as described above is resistant to strong acids such as hydrochloric acid and sulfuric acid. Since it is not sufficient, industrialization is difficult even if possible at the experimental level.
  • Non-Patent Document 2 since the polymer membrane (organic membrane) swells, it is reported that the permeation flux decreases as the hydrochloric acid concentration increases and the separation factor decreases when the hydrochloric acid concentration is 20% or more. Has been.
  • the present invention has been made in view of such conventional circumstances.
  • the object of the present invention is to allow dehydration and concentration of sulfuric acid by allowing water to permeate from a liquid mixture containing sulfuric acid and water, and to provide a polymer.
  • a separation membrane with higher durability against sulfuric acid compared to a membrane (organic membrane), and by using such a separation membrane, it becomes easy to change the design of the apparatus according to fluctuations in the amount of sulfuric acid waste.
  • An object of the present invention is to provide a sulfuric acid concentration method and a sulfuric acid concentration apparatus that can reduce the cost of energy.
  • the following separation membrane for sulfuric acid concentration, sulfuric acid concentration method and sulfuric acid concentration device are provided.
  • a separation membrane for concentration of sulfuric acid which is an inorganic membrane capable of concentrating sulfuric acid by permeating water in a vapor state from a liquid mixture containing sulfuric acid and water.
  • the porous substrate includes at least one ceramic particle selected from the group consisting of titania particles, alumina particles, silica particles, cordierite particles, zirconia particles, and mullite particles [3] or [4] Separation membrane for sulfuric acid concentration described in 1.
  • a separation membrane that is an inorganic membrane
  • a liquid mixture containing sulfuric acid and water is brought into contact with one surface (supply side surface) of the separation membrane as a supply component, and the other surface (permeation side surface) of the separation membrane
  • An inorganic membrane capable of concentrating sulfuric acid by permeating water in a vapor state from a liquid mixture containing sulfuric acid and water is provided as a separation membrane, and has a porous substrate that supports the separation membrane, The porous base material separates a raw material side space and a permeate side space, a supply unit that supplies the liquid mixture to the raw material side space, and vapor that has passed through the separation membrane from the permeate side space.
  • a sulfuric acid concentrator comprising: a permeate vapor recovery unit for recovery;
  • the separation membrane for concentration of sulfuric acid according to the present invention can concentrate sulfuric acid by permeating water in a vapor state from a liquid mixture containing sulfuric acid and water, and by using this, dehydration concentration of sulfuric acid by a membrane separation process Is possible. Moreover, since this separation membrane for sulfuric acid concentration is an inorganic membrane, it has high durability against sulfuric acid, exhibits stable permeation performance for a long period of time, and enables industrialization of sulfuric acid dehydration concentration by membrane separation process.
  • the sulfuric acid concentration apparatus of the present invention includes a separation membrane that is an inorganic membrane, and performs dehydration and concentration of sulfuric acid by a membrane separation process. Since dehydration and concentration can be performed even at a temperature below the boiling point of sulfuric acid, It can be easily manufactured using highly versatile materials, and a heat source other than heated steam (for example, waste water) can be used to heat the liquid mixture. As a result, the device is manufactured and the liquid mixture is heated. Energy-saving and low environmental load system that can keep the cost required for the system low. In addition, as described above, since it can be easily manufactured using a highly versatile material, a liquid mixture to be processed can be manufactured by preparing a plurality of small-scale devices and increasing or decreasing the number of devices to be installed. It is possible to flexibly and easily cope with fluctuations in the amount of the above.
  • the separation membrane for concentration of sulfuric acid is an inorganic membrane capable of concentrating sulfuric acid by permeating water in a vapor state from a liquid mixture containing sulfuric acid and water.
  • an inorganic film such as a carbon film, a silica film, or a zeolite film
  • water is vaporized from a liquid mixture containing sulfuric acid and water.
  • sulfuric acid can be stably concentrated.
  • the present invention was completed using an inorganic membrane as a separation membrane for concentration of sulfuric acid (hereinafter sometimes referred to simply as “separation membrane”).
  • the separation membrane of the present invention it is possible to dehydrate and concentrate sulfuric acid by a membrane separation process.
  • this separation membrane is not a polymer membrane (organic membrane) as described in Non-Patent Document 2, but an inorganic membrane, it has high durability against sulfuric acid and stable permeation performance over a long period of time. Demonstrate and enable industrialization of dehydration and concentration of sulfuric acid by membrane separation process.
  • the inorganic membrane to be the separation membrane of the present invention is not particularly limited as long as it can concentrate sulfuric acid by permeating water in a vapor state from a liquid mixture containing sulfuric acid and water, but permeation performance, durability, etc. From this point of view, any film selected from the group consisting of a carbon film, a silica film, and a zeolite film is preferable.
  • the carbon film is a film obtained by carbonizing a carbon-containing layer as a precursor by pyrolyzing in an oxygen inert atmosphere, and the thermal decomposition is preferably performed at 400 to 1000 ° C., and 450 to 900 ° C. More preferably, “Oxygen inert atmosphere” refers to an atmosphere in which a precursor for forming a carbon film is not oxidized even when heated in the above temperature range, specifically, in an inert gas such as nitrogen or argon, or in a vacuum, etc. Say the atmosphere.
  • the precursor for forming a carbon film by thermal decomposition is not particularly limited as long as it contains carbon, and examples thereof include polyethylene glycol, ethyl cellulose, and other resins.
  • the resin for example, a resin mainly composed of a polyimide resin, a phenol resin, a polyamideimide resin, or the like can be preferably used.
  • the “main component” refers to a component contained by 50% by mass or more of the whole.
  • the thickness of the carbon film is preferably 0.05 to 5.0 ⁇ m, more preferably 0.05 to 1.0 ⁇ m. If the thickness is less than 0.05 ⁇ m, defects may occur in the carbon film, and if the thickness is more than 5.0 ⁇ m, the permeation flux when the mixture is separated may be reduced.
  • the average pore diameter of the carbon film is preferably 0.2 to 100 nm, and more preferably 0.2 to 10 nm. The “average pore diameter” can be measured by a gas adsorption method.
  • the thickness of the silica film is preferably 0.01 to 1.0 ⁇ m. When the thickness is less than 0.01 ⁇ m, defects may occur in the silica membrane, and when the thickness is greater than 1.0 ⁇ m, the permeation flux when the mixture is separated may be reduced.
  • the average pore diameter of the silica membrane is preferably 0.3 to several nm. The “average pore diameter” can be measured by a gas adsorption method.
  • the DDR type zeolite membrane is a crystal made of silica, and its pores are formed by a polyhedron containing an oxygen 8-membered ring.
  • the DDR type zeolite membrane can be obtained by hydrothermal synthesis of a raw material solution composed of a templating agent, a silica source, and water. Hydrothermal synthesis is preferably carried out at 130 to 200 ° C, more preferably 150 to 170 ° C.
  • the obtained DDR type zeolite membrane is subjected to heat treatment to remove the templating agent.
  • the thickness of the DDR type zeolite membrane is preferably 0.5 to 30 ⁇ m, and more preferably 0.5 to 10 ⁇ m. If the thickness is less than 0.5 ⁇ m, a dense DDR type zeolite membrane may not be obtained. If the thickness is more than 30 ⁇ m, the permeation flux in separating the mixture may be reduced.
  • the MFI type zeolite membrane is a crystal containing silica or silica and alumina, and its pores are formed by a polyhedron containing an oxygen 10-membered ring.
  • the MFI type zeolite membrane is obtained by hydrothermal synthesis of a raw material solution composed of a templating agent, a silica source, or a silica source and an alumina source, and water. Hydrothermal synthesis is preferably performed at 100 to 200 ° C, more preferably 120 to 180 ° C.
  • the obtained MFI type zeolite membrane is subjected to heat treatment to remove the templating agent.
  • the thickness of the MFI type zeolite membrane is preferably 1.0 to 30 ⁇ m, and more preferably 1.0 to 10 ⁇ m. When the thickness is less than 1.0 ⁇ m, a dense MFI type zeolite membrane may not be obtained. When the thickness is more than 30 ⁇ m, the permeation flux when the mixture is separated may be lowered.
  • separation membranes inorganic membranes
  • the material of the porous substrate is not particularly limited as long as it has sufficient strength, permeation performance, corrosion resistance, etc.
  • metal, ceramics, etc. can be used.
  • ceramics it is preferable to use a porous substrate containing at least one kind of ceramic particles selected from the group consisting of titania particles, alumina particles, silica particles, cordierite particles, zirconia particles and mullite particles, which will be described later.
  • a porous substrate composed of alumina particles or titania particles having high corrosion resistance because there is a possibility that the sulfuric acid concentrating apparatus may be in direct contact with sulfuric acid when the apparatus is abnormal.
  • the shape of the porous substrate is not particularly limited, and the shape may be determined according to the purpose, such as a disk shape, a polygonal plate shape, a cylinder shape such as a cylinder or a square tube, a column shape such as a column or a prism.
  • a monolithic porous substrate As shown in FIG. 1, the “monolith-shaped porous substrate” means a lotus-like or honeycomb-shaped porous substrate 1 having a plurality of through holes 2 formed in the longitudinal direction 60 (monolith-shaped substrate). Say 1a).
  • the size of the porous substrate is not particularly limited, and the size can be determined according to the purpose within a range that satisfies the strength required for the support and does not impair the water permeability.
  • the porosity of the porous substrate is preferably 20 to 80%, and more preferably 30 to 70%.
  • a suitable porous substrate is an average particle size of 0.3 to 0.3 on the inner wall surface of a through hole of a monolithic titania porous substrate having an average particle size of 10 to 100 ⁇ m and an average pore size of 1 to 30 ⁇ m.
  • 10 ⁇ m titania particles are deposited by filtration film formation and then fired to form a first surface dense layer having a thickness of 10 to 1000 ⁇ m and an average pore diameter of 0.1 to 3 ⁇ m, and an average is further formed on the first surface dense layer.
  • Examples include titania particles having a particle diameter of 0.03 to 1 ⁇ m deposited by filtration and then fired to form a second surface dense layer having a thickness of 1 to 100 ⁇ m and an average pore diameter of 0.01 to 0.5 ⁇ m. Can do.
  • the separation membrane of the present invention While forming the separation membrane of the present invention on the inner wall surface of the through-hole 2 of such a monolith-shaped substrate 1a and circulating a liquid mixture containing sulfuric acid and water in the through-hole 2, the monolith-shaped substrate 1a When the side surface 3 is depressurized, the water in the liquid mixture passes through the separation membrane in a vapor state, passes through the pores inside the monolithic substrate 1a, and is discharged from the side surface 3 of the porous substrate.
  • sticker part 12 is arrange
  • the seal portion 12 is disposed so as not to block the through-hole 2 over the entire end faces 4 and 4 of the porous substrate 1.
  • the seal portion 12 is arranged in this way, a part of the liquid mixture containing sulfuric acid and water does not pass through the separation membrane 11 and the inside of the porous substrate 1 from the end surface 4 of the porous substrate 1. It is possible to prevent the water from flowing directly into the water and mixed with the water that has passed through the separation membrane 11 and discharged from the side surface 3.
  • the seal portion 12 examples include a glass seal and a metal seal.
  • a glass seal is preferable because the thermal expansion coefficient with the porous substrate 1 can be easily matched.
  • it does not specifically limit as a physical property of the glass used for a glass seal, It is preferable to have a thermal expansion coefficient near the thermal expansion coefficient of a porous base material.
  • lead-free glass containing no lead is preferable, and among them, glass having a high SiO 2 content and a low alkali component is generally more preferable because of its high acid resistance.
  • the method for producing a separation membrane of the present invention will be described by taking the case where the porous substrate forming the separation membrane is a monolith-shaped substrate as an example.
  • a monolith-shaped substrate 1a that is a support for forming a separation membrane is prepared.
  • the monolith-shaped substrate 1a can be produced by forming a molding raw material (kneaded material) composed of predetermined components into a monolith shape by a conventionally known extrusion molding method, and firing the obtained molded body.
  • a glass paste is applied to both end faces 4 and 4 of the monolith-shaped substrate 1a and heated at a predetermined temperature to form a seal portion 12 as shown in FIG.
  • a glass material applied to the monolithic substrate 1a as a glass paste lead-free glass containing no lead is preferable.
  • the glass material preferably has a softening point of 600 to 1000 ° C., more preferably 700 to 1000 ° C. If the softening point is lower than 600 ° C., the glass may melt during heating in the formation process of the separation membrane 11, and if higher than 1000 ° C., the sintering of the particles constituting the monolithic substrate 1 a is more than necessary. It may make you progress.
  • the glass paste can be produced by dispersing powdered glass in a solvent such as water. Alternatively, the polymer may be added in addition to a solvent such as water.
  • a film forming process for forming a film made of a precursor solution or the like for forming the separation film 11 on the monolithic substrate 1a is performed.
  • the method of passing the precursor solution or the like through the through-hole 2 of the monolithic substrate 1a is not particularly limited as long as the film thickness is uniform.
  • dip film formation can be mentioned as a suitable method.
  • a precursor solution for forming a separation membrane used for forming a carbon membrane it is preferable to use a polyimide solution and / or a phenol solution.
  • the polyimide solution and / or phenol solution is obtained by dissolving a polyimide resin and / or phenol solution in a suitable organic solvent such as N-methyl-2-pyrrolidone (NMP).
  • NMP N-methyl-2-pyrrolidone
  • concentration of the polyimide and / or phenol solution in the polyimide solution and / or phenol solution is not particularly limited, but is preferably 1 to 15% by mass from the viewpoint of making the solution easy to form a film.
  • a drying process for drying the film (coat layer) made of the precursor solution is performed.
  • the coat layer is air-dried while passing hot air from the opening 51 of one end face 4 to the opening 51 of the other end face 4.
  • a heat treatment step (carbonization) of the resin layer obtained by drying the coat layer is performed in a vacuum or an inert atmosphere such as a nitrogen atmosphere or an argon atmosphere.
  • the resin layer is carbonized by pyrolysis in a temperature range of about 400 to 1000 ° C., thereby forming a separation membrane (carbon membrane) 11 as shown in FIG.
  • carbon membrane carbon membrane
  • carbonization is performed at a temperature of less than 400 ° C., the resin layer is not sufficiently carbonized, and the selectivity as a molecular sieve membrane and the permeation rate are lowered.
  • carbonization is performed at a temperature exceeding 1000 ° C., the permeation rate decreases due to shrinkage of the pore diameter.
  • the silica sol solution for forming a separation membrane used for film formation in the silica film formation step forms a ceramic porous membrane that can be used as a separation membrane by forming a film on a substrate and firing it.
  • a slurry-like ceramic sol solution for the above-mentioned preferably made of a ceramic sol having an average particle size of 1 to 100 nm, more preferably an average particle size of 1 to 50 nm.
  • the average value of the particle size measured by the dynamic scattering method is indicated. Specifically, measurement was performed with DLS-7000 manufactured by Otsuka Electronics Co., Ltd., and a cumulant analysis method was used as a particle size calculation method.
  • the silica sol solution may contain additives depending on the purpose, such as a dispersant for improving dispersibility and a crack preventing agent for preventing cracks during drying of the film.
  • the silica sol solution may be prepared by itself, or a commercially available sol solution having a solid content concentration of 5 to 40% may be used.
  • the silica sol solution is fed and filled into the through-hole 2 of the monolithic substrate 1a and the silica sol solution is brought into contact with the inner wall surface of the through-hole 2 for a certain time is preferable. Thereafter, the silica sol solution is discharged from the through hole 2.
  • a drying process for drying the film (coating layer) made of silica sol is performed.
  • the coat layer is air-dried while passing hot air from the opening 51 of one end face 4 to the opening 51 of the other end face 4.
  • the vacuum suction is performed from the secondary side of the porous base material (the surface side where the film is not formed (in this example, the outer peripheral surface side of the monolithic base material 1a)) by the vacuum pump during drying, priority is given to the defective portion of the film.
  • the silica sol solution penetrates, a defect repair effect can be obtained.
  • the silica sol formed on the inner wall surface of the through-hole 2 of the monolithic substrate 1a is baked in an air atmosphere.
  • the silica sol layer becomes a separation membrane (silica membrane) 11 as shown in FIG. 3 by firing in a temperature range of about 300 to 1000 ° C.
  • the selectivity as a molecular sieve membrane and the permeation rate are lowered.
  • the permeation rate is reduced due to shrinkage of the pore diameter.
  • hydrothermal synthesis can be exemplified as a suitable method.
  • 1-adamantanamine when 1-adamantanamine is used as a templating agent, the blending ratio of 1-adamantanamine to silica (1-adamantanamine (mol) / silica (mol)) is 0.03 to 0.04, and water A monolith in which a raw material solution having a mixing ratio with respect to silica (water (mol) / silica (mol)) of 20 to 500 is formed and the outer periphery is sealed with a fluororesin tape or the like in the obtained raw material solution A DDR type zeolite membrane is formed on the inner wall surface of the through-hole 2 by impregnating the shaped substrate 1a and hydrothermally synthesizing.
  • ethylenediamine may be added to easily dissolve 1-adamantanamine, or DDR type zeolite powder may be added as a seed crystal having an effect of assisting the formation
  • Hydrothermal synthesis is preferably performed at 130 to 200 ° C, more preferably 150 to 170 ° C.
  • the thickness of the DDR type zeolite membrane can be controlled by controlling the hydrothermal synthesis temperature, the composition of the raw material solution, and the synthesis time.
  • the outer peripheral seal fluororesin tape, etc.
  • the DDR type zeolite membrane is boiled, washed and dried, and then heat-treated at about 600 ° C. in an air atmosphere, so that 1 -Adamantaneamine is removed to form a separation membrane (DDR type zeolite membrane) 11 as shown in FIG.
  • Hydrothermal synthesis can be mentioned as a suitable method for the film forming process of the MFI type zeolite membrane.
  • TPAOH tetrapropylammonium hydroxide
  • TPABr tetrapropylammonium bromide
  • TPA tetrapropylammonium ion
  • the mixing ratio of TPA to silica is prepared from 0.05 to 0.5, and a raw material solution having a mixing ratio of water to silica (water (mol) / silica (mol)) of 10 to 50 is prepared and obtained.
  • the obtained raw material solution is impregnated with a monolithic base material 1a whose outer periphery is sealed with a fluororesin tape or the like, and hydrothermally synthesized to form an MFI-type zeolite seed crystal on the inner wall surface of the through-hole 2;
  • the blending ratio of TPA to silica (TPA (mol) / silica (mol)) is 0.01 to 0.5, and water
  • a raw material solution prepared such that the blending ratio (water (mol) / silica (mol)) is 100 to 700, and the resulting raw material solution is sealed in a monolithic shape with a fluororesin tape or the like
  • An MFI type zeolite membrane is formed on the inner wall surface of the through hole 2 by impregnating the base material 1a and hydrothermal synthesis.
  • Hydrothermal synthesis is preferably performed at 100 to 200 ° C, more preferably 120 to 180 ° C.
  • the thickness of the MFI-type zeolite membrane can be controlled by controlling the hydrothermal synthesis temperature, the composition of the raw material solution, and the synthesis time.
  • the outer peripheral seal fluororesin tape, etc.
  • the MFI-type zeolite membrane is boiled, washed and dried, and then heat-treated at about 500 ° C. in an air atmosphere, so that the template agent tetra
  • the propylammonium is removed to form a separation membrane (MFI type zeolite membrane) 11 as shown in FIG.
  • the sulfuric acid concentration method of the present invention uses a separation membrane (inorganic membrane) as described above and concentrates sulfuric acid by a pervaporation method (pervaporation method). Specifically, a liquid mixture containing sulfuric acid and water is brought into contact with one surface (supply side surface) of the separation membrane as a supply component, and water is discharged in a vapor state from the other surface (permeation side surface) of the separation membrane. To concentrate the sulfuric acid in the liquid mixture.
  • the liquid mixture is preferably supplied in a heated state.
  • heating at 50 ° C. or higher is preferable.
  • the water in the liquid mixture is discharged in a vapor state from the permeation side surface of the separation membrane.
  • a known vacuum device such as a vacuum pump or a pressure controller.
  • the lower the degree of vacuum the better.
  • the absolute pressure is preferably 50 torr or less, and more preferably 10 torr or less.
  • the absolute pressure is 450 torr or less. I just need it.
  • the supply side of the separation membrane may be pressure controlled to increase the permeation flux.
  • the higher pressure is desirable, it is preferably 100 atm or less in consideration of energy consumption and the cost of the pressure device.
  • sulfuric acid can be dehydrated and concentrated even if the temperature of the liquid mixture as the supply component is lower than the boiling point of sulfuric acid.
  • Equipment and energy costs required for implementation can be kept low, and energy-saving and low environmental impact processes can be realized.
  • the sulfuric acid concentration apparatus of the present invention is for carrying out the sulfuric acid concentration method of the present invention.
  • the sulfuric acid concentrator includes a separation unit that partitions a raw material side space and a permeation side space, a supply unit that supplies a liquid mixture containing sulfuric acid and water to the raw material side space, and a vapor that has permeated the separation membrane from the permeation side space. And a permeate vapor recovery unit for recovering the gas.
  • the separation part is configured by a fluororesin module 37 having a porous substrate that includes the separation membrane (inorganic membrane) as described above and supports the separation membrane.
  • the supply unit is constituted by a raw material tank 35 and a circulation pump 36, and the permeation recovery unit is constituted by a cooling trap 38 and a vacuum pump 39 which are cooling devices.
  • the material of the parts in contact with sulfuric acid such as modules and pipes in the apparatus may be anything such as highly corrosion-resistant metal or resin as long as it is a material that is durable against sulfuric acid.
  • Preferable materials include, for example, glass, fluororesin PTFE, ETFE, PFA, and fluororubber FKM, FFKM, and the like.
  • the raw material tank 35 heats and holds a liquid mixture (raw material (feed liquid)) containing sulfuric acid and water, which is placed in the tank, at a predetermined temperature (for example, 50 ° C.).
  • the fluororesin module 37 is provided with a supply liquid introduction port 37 a and a supply liquid discharge port 37 b so as to communicate with the raw material side space 31.
  • a permeated vapor recovery port 37c is formed for discharging the gas.
  • the liquid mixture in the raw material tank 35 is configured to be supplied to the raw material side space 31 of the fluororesin module 37 by a circulation pump 36.
  • the fluororesin module 37 is configured so that the porous base material 1 (monolithic base material 1a) on which the separation membrane is formed can be placed at predetermined positions on both ends of the outer periphery through the fluororubber o-rings 33. It is configured.
  • the fluororesin module 37 is partitioned into a raw material side space 31 and a permeation side space 32 by a fluororubber o-ring 33, a glass seal (seal part 12) and the separation membrane 11.
  • a cooling trap (liquid nitrogen trap) 38 and a vacuum pump 39 are provided on the permeate vapor recovery port 37c side of the fluororesin module 37, and the permeate vapor discharged from the permeate vapor recovery port 37c is recovered by the cooling trap 38. It is configured as follows.
  • a supply liquid heating means 40 for heating the liquid mixture supplied to the raw material side space 31, and supply the liquid mixture in a heated state.
  • the supply liquid heating means 40 can be disposed upstream of the fluororesin module 37, but is disposed so as to heat the entire fluororesin module 37 and indirectly heat the liquid mixture. Also good. Further, the fluororesin module 37 may be integrated, and the fluororesin module 37 itself may also serve as the supply liquid heating means 40.
  • the sulfuric acid concentrator 101 is preferably provided with a pressure increasing means 41 for increasing the pressure of the liquid mixture supplied to the raw material side space 31, and pressure control is performed to increase the permeation flux.
  • the liquid mixture (raw material) is supplied from the supply liquid introduction port 37a to the raw material side space 31 of the fluororesin module 37 by the circulation pump 36, and the liquid mixture discharged from the supply liquid discharge port 37b is supplied to the raw material tank.
  • the liquid mixture is circulated by returning to 35.
  • the base material side of the separation membrane 11 is depressurized by the vacuum pump 39 while at least a part of the liquid mixture is brought into contact with the membrane supply side 11a of the separation membrane 11, so that the membrane permeation side 11b of the separation membrane 11 is reduced.
  • the permeated vapor that permeates the gas and is discharged from the permeated vapor recovery port 37 c is recovered by the cooling trap 38.
  • the degree of vacuum in the transmission side space 32 is controlled by a pressure controller under a predetermined reduced pressure (for example, about 0.5 Torr).
  • the sulfuric acid concentration apparatus of the present invention includes a separation membrane that is an inorganic membrane, and performs dehydration and concentration of sulfuric acid by a membrane separation process.
  • a separation membrane that is an inorganic membrane, and performs dehydration and concentration of sulfuric acid by a membrane separation process.
  • heat sources other than heated steam for example, waste water
  • An energy-saving and low environmental load system that can keep costs low can be realized.
  • a liquid mixture to be processed can be manufactured by preparing a plurality of small-scale devices and increasing or decreasing the number of devices to be installed. It is possible to flexibly and easily cope with fluctuations in the amount of the above.
  • the sulfuric acid concentrator may be a batch system in which the liquid mixture is stored in the raw material tank and the supply liquid is circulated, or the liquid mixture that has permeated the separation membrane is continuously processed without being circulated. The method may be used.
  • Example 1 A porous alumina columnar substrate (monolithic substrate) having a diameter of 30 mm and a length of 160 mm provided with 55 through-holes having a diameter of 2.5 mm along the longitudinal direction was produced by extrusion molding and firing. The both ends were sealed by melting glass.
  • the monolith-shaped substrate on which the resin layer is formed is heat-treated at 700 ° C. for 1 hour in a nitrogen atmosphere (temperature increase rate: 300 ° C./h) to carbonize the resin layer, whereby the through-hole of the monolith-shaped substrate is formed.
  • a carbon membrane (separation membrane) formed on the inner wall surface was obtained. The thickness of this carbon film was about 0.5 microns.
  • Example 2 A mixture of 31.22 g of a 40% by mass tetrapropylammonium hydroxide solution (manufactured by SACHEM) and 16.29 g of tetrapropylammonium bromide (manufactured by Wako Pure Chemical Industries, Ltd.), and 71.25 g of distilled water, 30 g of silica sol (trade name: Snowtech S, Nissan Chemical Co., Ltd.) 82 g was added and stirred at room temperature to obtain a seeding sol.
  • SACHEM 40% by mass tetrapropylammonium hydroxide solution
  • tetrapropylammonium bromide manufactured by Wako Pure Chemical Industries, Ltd.
  • the obtained seeding sol was placed in a stainless steel 300 ml pressure vessel in which a fluororesin inner cylinder was disposed, and the same monolith-shaped substrate as the monolith-shaped substrate used in Example 1 was The surface was immersed in a seeding sol in a pressure vessel with a fluororesin tape wound around, and reacted at 110 ° C. for 12 hours.
  • the fluororesin tape was removed from the monolith-shaped substrate after the reaction, washed by boiling, and then dried at 80 ° C. for 12 hours.
  • X-ray diffraction of the crystal particles after the reaction confirmed that MFI-type zeolite (zeolite seed crystal) was deposited and present on the inner wall surface of the through hole of the monolith-shaped substrate.
  • the obtained film-forming sol is placed in a stainless steel 300 ml pressure vessel in which a fluororesin inner cylinder is disposed, and the monolith-shaped substrate on which the zeolite seed crystals are deposited is made of fluororesin on the outer peripheral surface thereof.
  • the film was immersed in a film-forming sol in a pressure vessel with the tape wound, and reacted at 160 ° C. for 24 hours. After the reaction, the fluororesin tape was removed from the monolith-shaped substrate and boiling washing was repeated 5 times, followed by drying at 80 ° C. for 16 hours.
  • the series of operations of immersion, reaction, boiling washing, and drying of the monolith-shaped substrate into the film-forming sol was repeated again, and then the monolith-shaped substrate was heated at 500 ° C. in the atmosphere. Heat treatment was performed for 4 hours to remove tetrapropylammonium, and an MFI type zeolite membrane (separation membrane) formed on the inner wall surface of the through hole of the monolith-shaped substrate was obtained.
  • the film thickness of this MFI type zeolite membrane was about 12 microns.
  • Tetraethoxysilane is hydrolyzed in the presence of nitric acid at 50 ° C. for 5 hours to form a sol solution, which is diluted with a mixed solution of ethanol and water (ethanol 96 mass% / water 4 mass%).
  • a raw material solution of 1.0% by mass of silica was prepared.
  • the same monolith-shaped substrate as the monolith-shaped substrate used in Example 1 was placed in a state in which a fluororesin tape was wound around the outer peripheral surface, and the raw material solution was poured from the upper part of the substrate to pass through the through holes. .
  • the base material was vibrated and the excess raw material solution was removed. Then, it dried for 2 hours using the dryer so that the wind of room temperature might pass the inside of the through-hole of the base material into which the raw material solution was poured.
  • Example 4 30.05 g of ethylenediamine (manufactured by Wako Pure Chemical Industries, Ltd.) is placed in a 100 ml wide-mouth bottle made of fluororesin, and then 4.75 g of 1-adamantanamine (manufactured by Katayama Chemical Co., Ltd.) is added. This was dissolved so that no precipitate remained. In another beaker, 217.05 g of water was placed, 50.05 g of 30% by mass silica sol (manufactured by Nissan Chemical Co., Ltd., trade name: Snowtex S) was added, and the mixture was stirred gently. Was added to the wide-mouthed jar, and stirred vigorously to prepare a raw material solution.
  • ethylenediamine manufactured by Wako Pure Chemical Industries, Ltd.
  • 1-adamantanamine manufactured by Katayama Chemical Co., Ltd.
  • the blending ratio of 1-adamantanamine to silica (1-adamantanamine (mol) / silica (mol)) was 0.125, and the blending ratio of water to silica (water (mol) / silica (mol)) was 56.
  • the blending ratio of ethylenediamine to 1-adamantanamine (ethylenediamine (mol) / 1-adamantanamine (mol)) was 16.
  • DDR type zeolite membrane separation membrane formed on the inner wall surface of the through hole of the monolith-shaped substrate.
  • the film thickness of this DDR type zeolite membrane was about 10 microns.
  • the gas permeation coefficient (Permeance (unit: nmol / Pa ⁇ m 2) measured with a dry gas meter or soap film flow meter provided on the gas recovery port 137c side for a certain time. S)) was obtained, and the results were graphed and shown in FIG. “Nmol” indicates “10 ⁇ 9 mol”.
  • the monolithic substrate 1a on which the separation membrane 11 is formed is housed in a fluororesin casing through fluororesin o-rings 33 at the outer peripheral portions of both ends (made of fluororesin).
  • Module 37) was placed in place.
  • the fluororesin module 37 is partitioned into a raw material side space 31 and a permeation side space 32 by a fluororubber o-ring 33, a glass seal (seal part 12) and the separation membrane 11.
  • the fluororesin module 37 is provided with a supply liquid introduction port 37a and a supply liquid discharge port 37b so as to communicate with the raw material side space 31, and the permeate side space 32 is used for discharging permeated vapor to the outside.
  • a permeate vapor recovery port 37c is formed.
  • the supply liquid (liquid mixture) is supplied from the supply liquid introduction port 37a to the raw material side space 31 of the fluororesin module 37 by the supply pump 36, and the supply liquid discharged from the supply liquid discharge port 37b is supplied to the raw material tank.
  • the feed liquid was circulated by returning to 35.
  • the linear velocity during circulation is 1.4 m per second.
  • the base material side of the separation membrane 11 is depressurized by the vacuum pump 39, whereby the permeated vapor that permeates the separation membrane 11 and is discharged from the permeated vapor recovery port 37c is cooled by a trap ( Liquid nitrogen trap) 38 was used.
  • the degree of vacuum of the transmission side space 32 was controlled under a predetermined reduced pressure (about 10 Torr) by a pressure controller.
  • the liquefied material (permeated liquid) of the permeated vapor collected by the cooling trap 38 was appropriately taken out, neutralized with an aqueous NaOH solution having a known concentration, and the sulfuric acid concentration of the permeated liquid was measured.
  • neutralization titration of the permeate neutralization is almost completed with one drop of the minimum dropping unit, and the actual sulfuric acid concentration is lower than the measurement result.
  • the feed solution was taken out at the same time, and the sulfuric acid concentration at the start of the test and the concentrated sulfuric acid concentration were confirmed by the same method.
  • the permeate was also measured for pH with a pH meter. Further, the water permeation flux was calculated from the amount of permeate collected within a predetermined time.
  • the supply liquid As the supply liquid, first, concentrated sulfuric acid (reagent) and ion-exchanged water are mixed so that the sulfuric acid concentration becomes 3% by mass, and the supply liquid has a predetermined sulfuric acid concentration ( ⁇ 10% by mass). Concentration tests were conducted until Next, for Examples 1, 2 and 4, the sulfuric acid concentration of the supply liquid was changed to 10% by mass and the concentration test was restarted until the supply solution reached a predetermined sulfuric acid concentration ( ⁇ 20% by mass). A concentration test was performed, and subsequently, a concentration test was further performed by changing the sulfuric acid concentration of the feed solution to 20% by mass. For Example 3, the test was interrupted as described above, and the concentration was continuously performed without changing the sulfuric acid concentration of the feed solution. These test results are collectively graphed and shown in FIGS.
  • the present invention can be suitably used as a separation membrane for sulfuric acid concentration, a sulfuric acid concentration method, and a sulfuric acid concentration device for dehydrating and concentrating sulfuric acid by permeating water from a liquid mixture containing sulfuric acid and water.
  • 1 porous substrate, 1a: monolith-shaped substrate, 2: through-hole, 3: side surface, 4: end surface, 5: inner wall surface, 11: separation membrane, 11a: membrane supply side, 11b: membrane permeation side, 12 : Seal part, 31: Raw material side space, 32: Permeate side space, 33: Fluoro rubber o-ring, 35: Raw material tank, 36: Circulation pump, 37: Fluororesin module, 37a: Supply liquid inlet, 37b : Supply liquid discharge port, 37c: Permeate vapor recovery port, 38: Cooling trap, 39: Vacuum pump, 40: Supply liquid heating unit, 41: Boosting unit, 51: Opening, 60: Longitudinal direction, 100: Separation membrane arrangement Structure: 101: sulfuric acid concentrator, 131: gas supply side space, 132: permeation side space, 133: o-ring, 137: SUS module, 137a: supply gas inlet, 137b: supply gas outlet, 137c: Gas recovery port

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Organic Chemistry (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

Cette invention concerne une membrane de séparation utilisée pour concentrer l'acide sulfurique à partir d'un mélange liquide contenant de l'acide sulfurique et de l'eau, ladite membrane étant une membrane inorganique à travers laquelle l'eau contenue dans le mélange liquide peut passer à l'état vaporisé de manière à concentrer l'acide sulfurique.
PCT/JP2010/056433 2009-05-01 2010-04-09 Membrane de séparation pour la concentration de l'acide sulfurique, procédé de concentration de l'acide sulfurique et appareil de concentration de l'acide sulfurique WO2010125897A1 (fr)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021188408A1 (fr) * 2020-03-16 2021-09-23 Dupont Safety & Construction, Inc. Concentration d'acide sulfurique
CN113574162A (zh) * 2019-03-14 2021-10-29 帝人株式会社 生物学粒子的浓缩膜、浓缩设备、浓缩系统及浓缩方法、以及生物学粒子的检测方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6480405A (en) * 1987-06-12 1989-03-27 Kuraray Co Separation of liquid mixture
JPH06254354A (ja) * 1993-03-04 1994-09-13 Mitsubishi Kasei Corp 浸透気化法による液体分離装置及び分離方法
JPH09131516A (ja) * 1995-11-10 1997-05-20 Mitsubishi Heavy Ind Ltd 浸透気化脱水精製法
JP2000237562A (ja) * 1999-02-23 2000-09-05 Kanebo Ltd 分子ふるい炭素膜およびその製造法、並びに浸透気化分離方法
WO2008078442A1 (fr) * 2006-12-25 2008-07-03 Ngk Insulators, Ltd. Membrane de séparation et son procédé de production

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6480405A (en) * 1987-06-12 1989-03-27 Kuraray Co Separation of liquid mixture
JPH06254354A (ja) * 1993-03-04 1994-09-13 Mitsubishi Kasei Corp 浸透気化法による液体分離装置及び分離方法
JPH09131516A (ja) * 1995-11-10 1997-05-20 Mitsubishi Heavy Ind Ltd 浸透気化脱水精製法
JP2000237562A (ja) * 1999-02-23 2000-09-05 Kanebo Ltd 分子ふるい炭素膜およびその製造法、並びに浸透気化分離方法
WO2008078442A1 (fr) * 2006-12-25 2008-07-03 Ngk Insulators, Ltd. Membrane de séparation et son procédé de production

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113574162A (zh) * 2019-03-14 2021-10-29 帝人株式会社 生物学粒子的浓缩膜、浓缩设备、浓缩系统及浓缩方法、以及生物学粒子的检测方法
WO2021188408A1 (fr) * 2020-03-16 2021-09-23 Dupont Safety & Construction, Inc. Concentration d'acide sulfurique
CN115298136A (zh) * 2020-03-16 2022-11-04 杜邦安全与建筑公司 硫酸的浓缩

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